functions.c

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#include "config.h"
#ifdef _MAKEDOC
#include "docs/makedoc_defs.h"
#else
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include "mutt/lib.h"
#include "config/lib.h"
#include "email/lib.h"
#include "core/lib.h"
#include "alias/lib.h"
#include "gui/lib.h"
#include "mutt.h"
#include "lib.h"
#include "attach/lib.h"
#include "browser/lib.h"
#include "editor/lib.h"
#include "history/lib.h"
#include "imap/lib.h"
#include "key/lib.h"
#include "menu/lib.h"
#include "ncrypt/lib.h"
#include "nntp/lib.h"
#include "pager/lib.h"
#include "pattern/lib.h"
#include "pop/lib.h"
#include "progress/lib.h"
#include "question/lib.h"
#include "send/lib.h"
#include "external.h"
#include "functions.h"
#include "globals.h"
#include "hook.h"
#include "mutt_header.h"
#include "mutt_mailbox.h"
#include "mutt_thread.h"
#include "muttlib.h"
#include "mview.h"
#include "mx.h"
#include "nntp/mdata.h"
#include "private_data.h"
#include "protos.h"
#include "shared_data.h"
#ifdef USE_AUTOCRYPT
#include "autocrypt/lib.h"
#endif
#ifdef USE_NOTMUCH
#include "notmuch/lib.h"
#endif
#ifdef ENABLE_NLS
#include <libintl.h>
#endif
#endif
 
// clang-format off
const struct MenuFuncOp OpIndex[] = { /* map: index */
  { "alias-dialog",                  OP_ALIAS_DIALOG },
#ifdef USE_AUTOCRYPT
  { "autocrypt-acct-menu",           OP_AUTOCRYPT_ACCT_MENU },
#endif
  { "bounce-message",                OP_BOUNCE_MESSAGE },
  { "break-thread",                  OP_MAIN_BREAK_THREAD },
  { "catchup",                       OP_CATCHUP },
  { "change-folder",                 OP_MAIN_CHANGE_FOLDER },
  { "change-folder-readonly",        OP_MAIN_CHANGE_FOLDER_READONLY },
  { "change-newsgroup",              OP_MAIN_CHANGE_GROUP },
  { "change-newsgroup-readonly",     OP_MAIN_CHANGE_GROUP_READONLY },
#ifdef USE_NOTMUCH
  { "change-vfolder",                OP_MAIN_CHANGE_VFOLDER },
#endif
  { "check-traditional-pgp",         OP_CHECK_TRADITIONAL },
  { "clear-flag",                    OP_MAIN_CLEAR_FLAG },
  { "collapse-all",                  OP_MAIN_COLLAPSE_ALL },
  { "collapse-thread",               OP_MAIN_COLLAPSE_THREAD },
  { "compose-to-sender",             OP_COMPOSE_TO_SENDER },
  { "copy-message",                  OP_COPY_MESSAGE },
  { "create-alias",                  OP_CREATE_ALIAS },
  { "decode-copy",                   OP_DECODE_COPY },
  { "decode-save",                   OP_DECODE_SAVE },
  { "decrypt-copy",                  OP_DECRYPT_COPY },
  { "decrypt-save",                  OP_DECRYPT_SAVE },
  { "delete-message",                OP_DELETE },
  { "delete-pattern",                OP_MAIN_DELETE_PATTERN },
  { "delete-subthread",              OP_DELETE_SUBTHREAD },
  { "delete-thread",                 OP_DELETE_THREAD },
  { "display-address",               OP_DISPLAY_ADDRESS },
  { "display-message",               OP_DISPLAY_MESSAGE },
  { "display-toggle-weed",           OP_DISPLAY_HEADERS },
  { "edit",                          OP_EDIT_RAW_MESSAGE },
  { "edit-label",                    OP_EDIT_LABEL },
  { "edit-or-view-raw-message",      OP_EDIT_OR_VIEW_RAW_MESSAGE },
  { "edit-raw-message",              OP_EDIT_RAW_MESSAGE },
  { "edit-type",                     OP_ATTACHMENT_EDIT_TYPE },
#ifdef USE_NOTMUCH
  { "entire-thread",                 OP_MAIN_ENTIRE_THREAD },
#endif
  { "exit",                          OP_EXIT },
  { "extract-keys",                  OP_EXTRACT_KEYS },
  { "fetch-mail",                    OP_MAIN_FETCH_MAIL },
  { "flag-message",                  OP_FLAG_MESSAGE },
  { "followup-message",              OP_FOLLOWUP },
  { "forget-passphrase",             OP_FORGET_PASSPHRASE },
  { "forward-message",               OP_FORWARD_MESSAGE },
  { "forward-to-group",              OP_FORWARD_TO_GROUP },
  { "get-children",                  OP_GET_CHILDREN },
  { "get-message",                   OP_GET_MESSAGE },
  { "get-parent",                    OP_GET_PARENT },
  { "group-chat-reply",              OP_GROUP_CHAT_REPLY },
  { "group-reply",                   OP_GROUP_REPLY },
  { "imap-fetch-mail",               OP_MAIN_IMAP_FETCH },
  { "imap-logout-all",               OP_MAIN_IMAP_LOGOUT_ALL },
  { "limit",                         OP_MAIN_LIMIT },
  { "limit-current-thread",          OP_LIMIT_CURRENT_THREAD },
  { "link-threads",                  OP_MAIN_LINK_THREADS },
  { "list-reply",                    OP_LIST_REPLY },
  { "list-subscribe",                OP_LIST_SUBSCRIBE },
  { "list-unsubscribe",              OP_LIST_UNSUBSCRIBE },
  { "mail",                          OP_MAIL },
  { "mail-key",                      OP_MAIL_KEY },
  { "mailbox-list",                  OP_MAILBOX_LIST },
  { "mark-message",                  OP_MARK_MSG },
  { "modify-labels",                 OP_MAIN_MODIFY_TAGS },
  { "modify-labels-then-hide",       OP_MAIN_MODIFY_TAGS_THEN_HIDE },
  { "modify-tags",                   OP_MAIN_MODIFY_TAGS },
  { "modify-tags-then-hide",         OP_MAIN_MODIFY_TAGS_THEN_HIDE },
  { "next-new",                      OP_MAIN_NEXT_NEW },
  { "next-new-then-unread",          OP_MAIN_NEXT_NEW_THEN_UNREAD },
  { "next-subthread",                OP_MAIN_NEXT_SUBTHREAD },
  { "next-thread",                   OP_MAIN_NEXT_THREAD },
  { "next-undeleted",                OP_MAIN_NEXT_UNDELETED },
  { "next-unread",                   OP_MAIN_NEXT_UNREAD },
  { "next-unread-mailbox",           OP_MAIN_NEXT_UNREAD_MAILBOX },
  { "parent-message",                OP_MAIN_PARENT_MESSAGE },
  { "pipe-entry",                    OP_PIPE },
  { "pipe-message",                  OP_PIPE },
  { "post-message",                  OP_POST },
  { "previous-new",                  OP_MAIN_PREV_NEW },
  { "previous-new-then-unread",      OP_MAIN_PREV_NEW_THEN_UNREAD },
  { "previous-subthread",            OP_MAIN_PREV_SUBTHREAD },
  { "previous-thread",               OP_MAIN_PREV_THREAD },
  { "previous-undeleted",            OP_MAIN_PREV_UNDELETED },
  { "previous-unread",               OP_MAIN_PREV_UNREAD },
  { "print-message",                 OP_PRINT },
  { "purge-message",                 OP_PURGE_MESSAGE },
  { "purge-thread",                  OP_PURGE_THREAD },
  { "quasi-delete",                  OP_MAIN_QUASI_DELETE },
  { "query",                         OP_QUERY },
  { "quit",                          OP_QUIT },
  { "read-subthread",                OP_MAIN_READ_SUBTHREAD },
  { "read-thread",                   OP_MAIN_READ_THREAD },
  { "recall-message",                OP_RECALL_MESSAGE },
  { "reconstruct-thread",            OP_RECONSTRUCT_THREAD },
  { "reply",                         OP_REPLY },
  { "resend-message",                OP_RESEND },
  { "root-message",                  OP_MAIN_ROOT_MESSAGE },
  { "save-message",                  OP_SAVE },
  { "set-flag",                      OP_MAIN_SET_FLAG },
  { "show-limit",                    OP_MAIN_SHOW_LIMIT },
  { "sidebar-first",                 OP_SIDEBAR_FIRST },
  { "sidebar-last",                  OP_SIDEBAR_LAST },
  { "sidebar-next",                  OP_SIDEBAR_NEXT },
  { "sidebar-next-new",              OP_SIDEBAR_NEXT_NEW },
  { "sidebar-open",                  OP_SIDEBAR_OPEN },
  { "sidebar-page-down",             OP_SIDEBAR_PAGE_DOWN },
  { "sidebar-page-up",               OP_SIDEBAR_PAGE_UP },
  { "sidebar-prev",                  OP_SIDEBAR_PREV },
  { "sidebar-prev-new",              OP_SIDEBAR_PREV_NEW },
  { "sidebar-toggle-virtual",        OP_SIDEBAR_TOGGLE_VIRTUAL },
  { "sidebar-toggle-visible",        OP_SIDEBAR_TOGGLE_VISIBLE },
  { "sort-mailbox",                  OP_SORT },
  { "sort-reverse",                  OP_SORT_REVERSE },
  { "sync-mailbox",                  OP_MAIN_SYNC_FOLDER },
  { "tag-pattern",                   OP_MAIN_TAG_PATTERN },
  { "tag-subthread",                 OP_TAG_SUBTHREAD },
  { "tag-thread",                    OP_TAG_THREAD },
  { "toggle-new",                    OP_TOGGLE_NEW },
  { "toggle-read",                   OP_TOGGLE_READ },
  { "toggle-write",                  OP_TOGGLE_WRITE },
  { "undelete-message",              OP_UNDELETE },
  { "undelete-pattern",              OP_MAIN_UNDELETE_PATTERN },
  { "undelete-subthread",            OP_UNDELETE_SUBTHREAD },
  { "undelete-thread",               OP_UNDELETE_THREAD },
  { "untag-pattern",                 OP_MAIN_UNTAG_PATTERN },
#ifdef USE_NOTMUCH
  { "vfolder-from-query",            OP_MAIN_VFOLDER_FROM_QUERY },
  { "vfolder-from-query-readonly",   OP_MAIN_VFOLDER_FROM_QUERY_READONLY },
  { "vfolder-window-backward",       OP_MAIN_WINDOWED_VFOLDER_BACKWARD },
  { "vfolder-window-forward",        OP_MAIN_WINDOWED_VFOLDER_FORWARD },
  { "vfolder-window-reset",          OP_MAIN_WINDOWED_VFOLDER_RESET },
#endif
  { "view-attachments",              OP_VIEW_ATTACHMENTS },
  { "view-raw-message",              OP_VIEW_RAW_MESSAGE },
  // Deprecated
  { "buffy-list",                    OP_MAILBOX_LIST },
  { NULL, 0 },
};
 
const struct MenuOpSeq IndexDefaultBindings[] = { /* map: index */
  { OP_ATTACHMENT_EDIT_TYPE,               "\005" },           // <Ctrl-E>
#ifdef USE_AUTOCRYPT
  { OP_AUTOCRYPT_ACCT_MENU,                "A" },
#endif
  { OP_BOUNCE_MESSAGE,                     "b" },
  { OP_CHECK_TRADITIONAL,                  "\033P" },          // <Alt-P>
  { OP_COPY_MESSAGE,                       "C" },
  { OP_CREATE_ALIAS,                       "a" },
  { OP_DECODE_COPY,                        "\033C" },          // <Alt-C>
  { OP_DECODE_SAVE,                        "\033s" },          // <Alt-s>
  { OP_DELETE,                             "d" },
  { OP_DELETE_SUBTHREAD,                   "\033d" },          // <Alt-d>
  { OP_DELETE_THREAD,                      "\004" },           // <Ctrl-D>
  { OP_DISPLAY_ADDRESS,                    "@" },
  { OP_DISPLAY_HEADERS,                    "h" },
  { OP_DISPLAY_MESSAGE,                    " " },              // <Space>
  { OP_DISPLAY_MESSAGE,                    "<keypadenter>" },
  { OP_DISPLAY_MESSAGE,                    "\n" },             // <Enter>
  { OP_DISPLAY_MESSAGE,                    "\r" },             // <Return>
  { OP_EDIT_LABEL,                         "Y" },
  { OP_EDIT_OR_VIEW_RAW_MESSAGE,           "e" },
  { OP_EXIT,                               "x" },
  { OP_EXTRACT_KEYS,                       "\013" },           // <Ctrl-K>
  { OP_FLAG_MESSAGE,                       "F" },
  { OP_FORGET_PASSPHRASE,                  "\006" },           // <Ctrl-F>
  { OP_FORWARD_MESSAGE,                    "f" },
  { OP_GROUP_REPLY,                        "g" },
  { OP_LIST_REPLY,                         "L" },
  { OP_MAIL,                               "m" },
  { OP_MAILBOX_LIST,                       "." },
  { OP_MAIL_KEY,                           "\033k" },          // <Alt-k>
  { OP_MAIN_BREAK_THREAD,                  "#" },
  { OP_MAIN_CHANGE_FOLDER,                 "c" },
  { OP_MAIN_CHANGE_FOLDER_READONLY,        "\033c" },          // <Alt-c>
  { OP_MAIN_CHANGE_GROUP,                  "i" },
  { OP_MAIN_CHANGE_GROUP_READONLY,         "\033i" },          // <Alt-i>
  { OP_MAIN_CLEAR_FLAG,                    "W" },
  { OP_MAIN_COLLAPSE_ALL,                  "\033V" },          // <Alt-V>
  { OP_MAIN_COLLAPSE_THREAD,               "\033v" },          // <Alt-v>
  { OP_MAIN_DELETE_PATTERN,                "D" },
  { OP_MAIN_FETCH_MAIL,                    "G" },
  { OP_MAIN_LIMIT,                         "l" },
  { OP_MAIN_LINK_THREADS,                  "&" },
  { OP_MAIN_NEXT_NEW_THEN_UNREAD,          "\t" },             // <Tab>
  { OP_MAIN_NEXT_SUBTHREAD,                "\033n" },          // <Alt-n>
  { OP_MAIN_NEXT_THREAD,                   "\016" },           // <Ctrl-N>
  { OP_MAIN_NEXT_UNDELETED,                "<down>" },
  { OP_MAIN_NEXT_UNDELETED,                "j" },
  { OP_MAIN_PARENT_MESSAGE,                "P" },
  { OP_MAIN_PREV_NEW_THEN_UNREAD,          "\033\t" },         // <Alt->
  { OP_MAIN_PREV_SUBTHREAD,                "\033p" },          // <Alt-p>
  { OP_MAIN_PREV_THREAD,                   "\020" },           // <Ctrl-P>
  { OP_MAIN_PREV_UNDELETED,                "<up>" },
  { OP_MAIN_PREV_UNDELETED,                "k" },
  { OP_MAIN_READ_SUBTHREAD,                "\033r" },          // <Alt-r>
  { OP_MAIN_READ_THREAD,                   "\022" },           // <Ctrl-R>
  { OP_MAIN_SET_FLAG,                      "w" },
  { OP_MAIN_SHOW_LIMIT,                    "\033l" },          // <Alt-l>
  { OP_MAIN_SYNC_FOLDER,                   "$" },
  { OP_MAIN_TAG_PATTERN,                   "T" },
  { OP_MAIN_UNDELETE_PATTERN,              "U" },
  { OP_MAIN_UNTAG_PATTERN,                 "\024" },           // <Ctrl-T>
  { OP_MARK_MSG,                           "~" },
  { OP_NEXT_ENTRY,                         "J" },
  { OP_PIPE,                               "|" },
  { OP_PREV_ENTRY,                         "K" },
  { OP_PRINT,                              "p" },
  { OP_QUERY,                              "Q" },
  { OP_QUIT,                               "q" },
  { OP_RECALL_MESSAGE,                     "R" },
  { OP_REPLY,                              "r" },
  { OP_RESEND,                             "\033e" },          // <Alt-e>
  { OP_SAVE,                               "s" },
  { OP_SHOW_LOG_MESSAGES,                  "M" },
  { OP_SORT,                               "o" },
  { OP_SORT_REVERSE,                       "O" },
  { OP_TAG_THREAD,                         "\033t" },          // <Alt-t>
  { OP_TOGGLE_NEW,                         "N" },
  { OP_TOGGLE_WRITE,                       "%" },
  { OP_UNDELETE,                           "u" },
  { OP_UNDELETE_SUBTHREAD,                 "\033u" },          // <Alt-u>
  { OP_UNDELETE_THREAD,                    "\025" },           // <Ctrl-U>
  { OP_VIEW_ATTACHMENTS,                   "v" },
  { 0, NULL },
};
// clang-format on
 
enum ResolveMethod
{
  RESOLVE_NEXT_EMAIL,     
  RESOLVE_NEXT_UNDELETED, 
  RESOLVE_NEXT_THREAD,    
  RESOLVE_NEXT_SUBTHREAD, 
};
 
static bool resolve_email(struct IndexPrivateData *priv,
                          struct IndexSharedData *shared, enum ResolveMethod rm)
{
  if (!priv || !priv->menu || !shared || !shared->mailbox || !shared->email)
    return false;
 
  const bool c_resolve = cs_subset_bool(shared->sub, "resolve");
  if (!c_resolve)
    return false;
 
  int index = -1;
  switch (rm)
  {
    case RESOLVE_NEXT_EMAIL:
      index = menu_get_index(priv->menu) + 1;
      break;
 
    case RESOLVE_NEXT_UNDELETED:
    {
      const bool uncollapse = mutt_using_threads() && !window_is_focused(priv->win_index);
      index = find_next_undeleted(shared->mailbox_view, menu_get_index(priv->menu), uncollapse);
      break;
    }
 
    case RESOLVE_NEXT_THREAD:
      index = mutt_next_thread(shared->email);
      break;
 
    case RESOLVE_NEXT_SUBTHREAD:
      index = mutt_next_subthread(shared->email);
      break;
  }
 
  if ((index < 0) || (index >= shared->mailbox->vcount))
  {
    // Resolve failed
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
    return false;
  }
 
  menu_set_index(priv->menu, index);
  return true;
}
 
bool index_next_undeleted(struct MuttWindow *win_index)
{
  struct MuttWindow *dlg = dialog_find(win_index);
  if (!dlg)
    return false;
 
  struct Menu *menu = win_index->wdata;
  struct IndexSharedData *shared = dlg->wdata;
  if (!shared)
    return false;
 
  struct IndexPrivateData *priv = win_index->parent->wdata;
  const bool uncollapse = mutt_using_threads() && !window_is_focused(priv->win_index);
 
  int index = find_next_undeleted(shared->mailbox_view, menu_get_index(menu), uncollapse);
  if ((index < 0) || (index >= shared->mailbox->vcount))
  {
    // Selection failed
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
    return false;
  }
 
  menu_set_index(menu, index);
  return true;
}
 
// -----------------------------------------------------------------------------
 
static int op_alias_dialog(struct IndexSharedData *shared,
                           struct IndexPrivateData *priv, int op)
{
  alias_dialog(shared->mailbox, shared->sub);
  return FR_SUCCESS;
}
 
static int op_attachment_edit_type(struct IndexSharedData *shared,
                                   struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
  mutt_edit_content_type(shared->email, shared->email->body, NULL);
 
  menu_queue_redraw(priv->menu, MENU_REDRAW_CURRENT);
  return FR_SUCCESS;
}
 
static int op_bounce_message(struct IndexSharedData *shared,
                             struct IndexPrivateData *priv, int op)
{
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  index_bounce_message(shared->mailbox, &ea);
  ARRAY_FREE(&ea);
 
  return FR_SUCCESS;
}
 
static int op_check_traditional(struct IndexSharedData *shared,
                                struct IndexPrivateData *priv, int op)
{
  if (!(WithCrypto & APPLICATION_PGP))
    return FR_NOT_IMPL;
  if (!shared->email)
    return FR_NO_ACTION;
 
  if (priv->tag_prefix || !(shared->email->security & PGP_TRADITIONAL_CHECKED))
  {
    struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
    ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
    if (mutt_check_traditional_pgp(shared->mailbox, &ea))
      menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
    ARRAY_FREE(&ea);
  }
 
  return FR_SUCCESS;
}
 
static int op_compose_to_sender(struct IndexSharedData *shared,
                                struct IndexPrivateData *priv, int op)
{
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  int rc = mutt_send_message(SEND_TO_SENDER, NULL, NULL, shared->mailbox, &ea,
                             shared->sub);
  ARRAY_FREE(&ea);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_create_alias(struct IndexSharedData *shared,
                           struct IndexPrivateData *priv, int op)
{
  struct AddressList *al = NULL;
  if (shared->email && shared->email->env)
    al = mutt_get_address(shared->email->env, NULL);
  alias_create(al, shared->sub);
  menu_queue_redraw(priv->menu, MENU_REDRAW_CURRENT);
 
  return FR_SUCCESS;
}
 
static int op_delete(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  /* L10N: CHECK_ACL */
  if (!check_acl(shared->mailbox, MUTT_ACL_DELETE, _("Can't delete message")))
    return FR_ERROR;
 
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
 
  mutt_emails_set_flag(shared->mailbox, &ea, MUTT_DELETE, true);
  mutt_emails_set_flag(shared->mailbox, &ea, MUTT_PURGE, (op == OP_PURGE_MESSAGE));
  const bool c_delete_untag = cs_subset_bool(shared->sub, "delete_untag");
  if (c_delete_untag)
    mutt_emails_set_flag(shared->mailbox, &ea, MUTT_TAG, false);
  ARRAY_FREE(&ea);
 
  if (priv->tag_prefix)
  {
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
  else
  {
    resolve_email(priv, shared, RESOLVE_NEXT_UNDELETED);
  }
 
  return FR_SUCCESS;
}
 
static int op_delete_thread(struct IndexSharedData *shared,
                            struct IndexPrivateData *priv, int op)
{
  /* L10N: CHECK_ACL */
  /* L10N: Due to the implementation details we do not know whether we
     delete zero, 1, 12, ... messages. So in English we use
     "messages". Your language might have other means to express this. */
  if (!check_acl(shared->mailbox, MUTT_ACL_DELETE, _("Can't delete messages")))
    return FR_ERROR;
  if (!shared->email)
    return FR_NO_ACTION;
 
  int subthread = (op == OP_DELETE_SUBTHREAD);
  int rc = mutt_thread_set_flag(shared->mailbox, shared->email, MUTT_DELETE, true, subthread);
  if (rc == -1)
    return FR_ERROR;
  if (op == OP_PURGE_THREAD)
  {
    rc = mutt_thread_set_flag(shared->mailbox, shared->email, MUTT_PURGE, true, subthread);
    if (rc == -1)
      return FR_ERROR;
  }
 
  const bool c_delete_untag = cs_subset_bool(shared->sub, "delete_untag");
  if (c_delete_untag)
    mutt_thread_set_flag(shared->mailbox, shared->email, MUTT_TAG, false, subthread);
 
  resolve_email(priv, shared, RESOLVE_NEXT_UNDELETED);
  menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  return FR_SUCCESS;
}
 
static int op_display_address(struct IndexSharedData *shared,
                              struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
  mutt_display_address(shared->email->env);
 
  return FR_SUCCESS;
}
 
static int op_display_message(struct IndexSharedData *shared,
                              struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
  /* toggle the weeding of headers so that a user can press the key
   * again while reading the message.  */
  if (op == OP_DISPLAY_HEADERS)
  {
    bool_str_toggle(shared->sub, "weed", NULL);
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, shared);
    if (!window_is_focused(priv->win_index))
      return FR_SUCCESS;
  }
 
  OptNeedResort = false;
 
  if (mutt_using_threads() && shared->email->collapsed)
  {
    mutt_uncollapse_thread(shared->email);
    mutt_set_vnum(shared->mailbox);
    const bool c_uncollapse_jump = cs_subset_bool(shared->sub, "uncollapse_jump");
    if (c_uncollapse_jump)
      menu_set_index(priv->menu, mutt_thread_next_unread(shared->email));
  }
 
  const bool c_pgp_auto_decode = cs_subset_bool(shared->sub, "pgp_auto_decode");
  if (c_pgp_auto_decode &&
      (priv->tag_prefix || !(shared->email->security & PGP_TRADITIONAL_CHECKED)))
  {
    struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
    ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
    if (mutt_check_traditional_pgp(shared->mailbox, &ea))
      menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
    ARRAY_FREE(&ea);
  }
  const int index = menu_get_index(priv->menu);
  index_shared_data_set_email(shared, mutt_get_virt_email(shared->mailbox, index));
 
  const char *const c_pager = pager_get_pager(NeoMutt->sub);
  if (c_pager)
  {
    op = external_pager(shared->mailbox_view, shared->email, c_pager);
  }
  else
  {
    op = mutt_display_message(priv->win_index, shared);
  }
 
  window_set_focus(priv->win_index);
  if (op < OP_NULL)
  {
    OptNeedResort = false;
    return FR_ERROR;
  }
 
  if (shared->mailbox)
  {
    update_index(priv->menu, shared->mailbox_view, MX_STATUS_NEW_MAIL,
                 shared->mailbox->msg_count, shared);
  }
 
  return op;
}
 
static int op_edit_label(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  int num_changed = mutt_label_message(shared->mailbox_view, &ea);
  ARRAY_FREE(&ea);
 
  if (num_changed > 0)
  {
    shared->mailbox->changed = true;
    menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
    /* L10N: This is displayed when the x-label on one or more
       messages is edited. */
    mutt_message(ngettext("%d label changed", "%d labels changed", num_changed), num_changed);
 
    if (!priv->tag_prefix)
      resolve_email(priv, shared, RESOLVE_NEXT_UNDELETED);
    return FR_SUCCESS;
  }
 
  /* L10N: This is displayed when editing an x-label, but no messages
     were updated.  Possibly due to canceling at the prompt or if the new
     label is the same as the old label. */
  mutt_message(_("No labels changed"));
  return FR_NO_ACTION;
}
 
static int op_edit_raw_message(struct IndexSharedData *shared,
                               struct IndexPrivateData *priv, int op)
{
  /* TODO split this into 3 cases? */
  bool edit;
  if (op == OP_EDIT_RAW_MESSAGE)
  {
    /* L10N: CHECK_ACL */
    if (!check_acl(shared->mailbox, MUTT_ACL_INSERT, _("Can't edit message")))
      return FR_ERROR;
    edit = true;
  }
  else if (op == OP_EDIT_OR_VIEW_RAW_MESSAGE)
  {
    edit = !shared->mailbox->readonly && (shared->mailbox->rights & MUTT_ACL_INSERT);
  }
  else
  {
    edit = false;
  }
 
  if (!shared->email)
    return FR_NO_ACTION;
  const bool c_pgp_auto_decode = cs_subset_bool(shared->sub, "pgp_auto_decode");
  if (c_pgp_auto_decode &&
      (priv->tag_prefix || !(shared->email->security & PGP_TRADITIONAL_CHECKED)))
  {
    struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
    ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
    if (mutt_check_traditional_pgp(shared->mailbox, &ea))
      menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
    ARRAY_FREE(&ea);
  }
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  mutt_ev_message(shared->mailbox, &ea, edit ? EVM_EDIT : EVM_VIEW);
  ARRAY_FREE(&ea);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return FR_SUCCESS;
}
 
static int op_end_cond(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  return FR_SUCCESS;
}
 
static int op_exit(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (shared->attach_msg)
    return FR_DONE;
 
  if (query_quadoption(_("Exit NeoMutt without saving?"), shared->sub, "quit") == MUTT_YES)
  {
    if (shared->mailbox_view)
    {
      mx_fastclose_mailbox(shared->mailbox, false);
      mview_free(&shared->mailbox_view);
    }
    return FR_DONE;
  }
 
  return FR_NO_ACTION;
}
 
static int op_extract_keys(struct IndexSharedData *shared,
                           struct IndexPrivateData *priv, int op)
{
  if (!WithCrypto)
    return FR_NOT_IMPL;
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  crypt_extract_keys_from_messages(shared->mailbox, &ea);
  ARRAY_FREE(&ea);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return FR_SUCCESS;
}
 
static int op_flag_message(struct IndexSharedData *shared,
                           struct IndexPrivateData *priv, int op)
{
  /* L10N: CHECK_ACL */
  if (!check_acl(shared->mailbox, MUTT_ACL_WRITE, _("Can't flag message")))
    return FR_ERROR;
 
  struct Mailbox *m = shared->mailbox;
  if (priv->tag_prefix)
  {
    for (size_t i = 0; i < m->msg_count; i++)
    {
      struct Email *e = m->emails[i];
      if (!e)
        break;
      if (message_is_tagged(e))
        mutt_set_flag(m, e, MUTT_FLAG, !e->flagged, true);
    }
 
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
  else
  {
    if (!shared->email)
      return FR_NO_ACTION;
    mutt_set_flag(m, shared->email, MUTT_FLAG, !shared->email->flagged, true);
 
    resolve_email(priv, shared, RESOLVE_NEXT_UNDELETED);
  }
 
  return FR_SUCCESS;
}
 
static int op_forget_passphrase(struct IndexSharedData *shared,
                                struct IndexPrivateData *priv, int op)
{
  crypt_forget_passphrase();
  return FR_SUCCESS;
}
 
static int op_forward_message(struct IndexSharedData *shared,
                              struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  const bool c_pgp_auto_decode = cs_subset_bool(shared->sub, "pgp_auto_decode");
  if (c_pgp_auto_decode &&
      (priv->tag_prefix || !(shared->email->security & PGP_TRADITIONAL_CHECKED)))
  {
    if (mutt_check_traditional_pgp(shared->mailbox, &ea))
      menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  }
  int rc = mutt_send_message(SEND_FORWARD, NULL, NULL, shared->mailbox, &ea,
                             shared->sub);
  ARRAY_FREE(&ea);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_group_reply(struct IndexSharedData *shared,
                          struct IndexPrivateData *priv, int op)
{
  SendFlags replyflags = SEND_REPLY;
  if (op == OP_GROUP_REPLY)
    replyflags |= SEND_GROUP_REPLY;
  else
    replyflags |= SEND_GROUP_CHAT_REPLY;
  if (!shared->email)
    return FR_NO_ACTION;
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  const bool c_pgp_auto_decode = cs_subset_bool(shared->sub, "pgp_auto_decode");
  if (c_pgp_auto_decode &&
      (priv->tag_prefix || !(shared->email->security & PGP_TRADITIONAL_CHECKED)))
  {
    if (mutt_check_traditional_pgp(shared->mailbox, &ea))
      menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  }
  int rc = mutt_send_message(replyflags, NULL, NULL, shared->mailbox, &ea,
                             shared->sub);
  ARRAY_FREE(&ea);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_jump(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  int rc = FR_ERROR;
  struct Buffer *buf = buf_pool_get();
 
  const int digit = op - OP_JUMP;
  if ((digit > 0) && (digit < 10))
  {
    mutt_unget_ch('0' + digit);
  }
 
  int msg_num = 0;
  if ((mw_get_field(_("Jump to message: "), buf, MUTT_COMP_NO_FLAGS, HC_OTHER, NULL, NULL) != 0) ||
      buf_is_empty(buf))
  {
    mutt_message(_("Nothing to do"));
    rc = FR_NO_ACTION;
  }
  else if (!mutt_str_atoi_full(buf_string(buf), &msg_num))
  {
    mutt_warning(_("Argument must be a message number"));
  }
  else if ((msg_num < 1) || (msg_num > shared->mailbox->msg_count))
  {
    mutt_warning(_("Invalid message number"));
  }
  else if (!shared->mailbox->emails[msg_num - 1]->visible)
  {
    mutt_warning(_("That message is not visible"));
  }
  else
  {
    struct Email *e = shared->mailbox->emails[msg_num - 1];
 
    if (mutt_messages_in_thread(shared->mailbox, e, MIT_POSITION) > 1)
    {
      mutt_uncollapse_thread(e);
      mutt_set_vnum(shared->mailbox);
    }
    menu_set_index(priv->menu, e->vnum);
    rc = FR_SUCCESS;
  }
 
  buf_pool_release(&buf);
  return rc;
}
 
static int op_list_reply(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  const bool c_pgp_auto_decode = cs_subset_bool(shared->sub, "pgp_auto_decode");
  if (c_pgp_auto_decode &&
      (priv->tag_prefix || !(shared->email->security & PGP_TRADITIONAL_CHECKED)))
  {
    if (mutt_check_traditional_pgp(shared->mailbox, &ea))
      menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  }
  int rc = mutt_send_message(SEND_REPLY | SEND_LIST_REPLY, NULL, NULL,
                             shared->mailbox, &ea, shared->sub);
  ARRAY_FREE(&ea);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_list_subscribe(struct IndexSharedData *shared,
                             struct IndexPrivateData *priv, int op)
{
  return mutt_send_list_subscribe(shared->mailbox, shared->email) ? FR_SUCCESS : FR_NO_ACTION;
}
 
static int op_list_unsubscribe(struct IndexSharedData *shared,
                               struct IndexPrivateData *priv, int op)
{
  return mutt_send_list_unsubscribe(shared->mailbox, shared->email) ? FR_SUCCESS : FR_NO_ACTION;
}
 
static int op_mail(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  int rc = mutt_send_message(SEND_NO_FLAGS, NULL, NULL, shared->mailbox, NULL,
                             shared->sub);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_mailbox_list(struct IndexSharedData *shared,
                           struct IndexPrivateData *priv, int op)
{
  mutt_mailbox_list();
  return FR_SUCCESS;
}
 
static int op_mail_key(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (!(WithCrypto & APPLICATION_PGP))
    return FR_NOT_IMPL;
  int rc = mutt_send_message(SEND_KEY, NULL, NULL, NULL, NULL, shared->sub);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_main_break_thread(struct IndexSharedData *shared,
                                struct IndexPrivateData *priv, int op)
{
  struct Mailbox *m = shared->mailbox;
  /* L10N: CHECK_ACL */
  if (!check_acl(m, MUTT_ACL_WRITE, _("Can't break thread")))
    return FR_ERROR;
 
  struct Email *e = shared->email;
  if (!e)
    return FR_NO_ACTION;
 
  if (!mutt_using_threads())
  {
    mutt_warning(_("Threading is not enabled"));
    return FR_NO_ACTION;
  }
 
  struct MailboxView *mv = shared->mailbox_view;
  if (!STAILQ_EMPTY(&e->env->in_reply_to) || !STAILQ_EMPTY(&e->env->references))
  {
    {
      mutt_break_thread(e);
      mutt_sort_headers(mv, true);
      menu_set_index(priv->menu, e->vnum);
    }
 
    m->changed = true;
    mutt_message(_("Thread broken"));
 
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
  else
  {
    mutt_error(_("Thread can't be broken, message is not part of a thread"));
  }
 
  return FR_SUCCESS;
}
 
static int op_main_change_folder(struct IndexSharedData *shared,
                                 struct IndexPrivateData *priv, int op)
{
  struct Buffer *folderbuf = buf_pool_get();
  buf_alloc(folderbuf, PATH_MAX);
 
  char *cp = NULL;
  bool read_only;
  const bool c_read_only = cs_subset_bool(shared->sub, "read_only");
  if (shared->attach_msg || c_read_only || (op == OP_MAIN_CHANGE_FOLDER_READONLY))
  {
    cp = _("Open mailbox in read-only mode");
    read_only = true;
  }
  else
  {
    cp = _("Open mailbox");
    read_only = false;
  }
 
  const bool c_change_folder_next = cs_subset_bool(shared->sub, "change_folder_next");
  if (c_change_folder_next && shared->mailbox && !buf_is_empty(&shared->mailbox->pathbuf))
  {
    buf_strcpy(folderbuf, mailbox_path(shared->mailbox));
    buf_pretty_mailbox(folderbuf);
  }
  /* By default, fill buf with the next mailbox that contains unread mail */
  mutt_mailbox_next(shared->mailbox_view ? shared->mailbox : NULL, folderbuf);
 
  if (mw_enter_fname(cp, folderbuf, true, shared->mailbox, false, NULL, NULL,
                     MUTT_SEL_NO_FLAGS) == -1)
  {
    goto changefoldercleanup;
  }
 
  /* Selected directory is okay, let's save it. */
  mutt_browser_select_dir(buf_string(folderbuf));
 
  if (buf_is_empty(folderbuf))
  {
    msgwin_clear_text(NULL);
    goto changefoldercleanup;
  }
 
  struct Mailbox *m = mx_mbox_find2(buf_string(folderbuf));
  if (m)
  {
    change_folder_mailbox(priv->menu, m, &priv->oldcount, shared, read_only);
  }
  else
  {
    change_folder_string(priv->menu, folderbuf, &priv->oldcount, shared, read_only);
  }
 
changefoldercleanup:
  buf_pool_release(&folderbuf);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return FR_SUCCESS;
}
 
static int op_main_collapse_all(struct IndexSharedData *shared,
                                struct IndexPrivateData *priv, int op)
{
  if (!mutt_using_threads())
  {
    mutt_error(_("Threading is not enabled"));
    return FR_ERROR;
  }
  collapse_all(shared->mailbox_view, priv->menu, 1);
 
  return FR_SUCCESS;
}
 
static int op_main_collapse_thread(struct IndexSharedData *shared,
                                   struct IndexPrivateData *priv, int op)
{
  if (!mutt_using_threads())
  {
    mutt_error(_("Threading is not enabled"));
    return FR_ERROR;
  }
 
  if (!shared->email)
    return FR_NO_ACTION;
 
  if (shared->email->collapsed)
  {
    int index = mutt_uncollapse_thread(shared->email);
    mutt_set_vnum(shared->mailbox);
    const bool c_uncollapse_jump = cs_subset_bool(shared->sub, "uncollapse_jump");
    if (c_uncollapse_jump)
      index = mutt_thread_next_unread(shared->email);
    menu_set_index(priv->menu, index);
  }
  else if (mutt_thread_can_collapse(shared->email))
  {
    menu_set_index(priv->menu, mutt_collapse_thread(shared->email));
    mutt_set_vnum(shared->mailbox);
  }
  else
  {
    mutt_error(_("Thread contains unread or flagged messages"));
    return FR_ERROR;
  }
 
  menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
 
  return FR_SUCCESS;
}
 
static int op_main_delete_pattern(struct IndexSharedData *shared,
                                  struct IndexPrivateData *priv, int op)
{
  /* L10N: CHECK_ACL */
  /* L10N: Due to the implementation details we do not know whether we
     delete zero, 1, 12, ... messages. So in English we use
     "messages". Your language might have other means to express this.  */
  if (!check_acl(shared->mailbox, MUTT_ACL_DELETE, _("Can't delete messages")))
    return FR_ERROR;
 
  mutt_pattern_func(shared->mailbox_view, MUTT_DELETE, _("Delete messages matching: "));
  menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
 
  return FR_SUCCESS;
}
 
static int op_main_limit(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  const bool lmt = mview_has_limit(shared->mailbox_view);
  int old_index = shared->email ? shared->email->index : -1;
  if (op == OP_TOGGLE_READ)
  {
    char buf2[1024] = { 0 };
 
    if (!lmt || !mutt_strn_equal(shared->mailbox_view->pattern, "!~R!~D~s", 8))
    {
      snprintf(buf2, sizeof(buf2), "!~R!~D~s%s", lmt ? shared->mailbox_view->pattern : ".*");
    }
    else
    {
      mutt_str_copy(buf2, shared->mailbox_view->pattern + 8, sizeof(buf2));
      if ((*buf2 == '\0') || mutt_strn_equal(buf2, ".*", 2))
        snprintf(buf2, sizeof(buf2), "~A");
    }
    mutt_str_replace(&shared->mailbox_view->pattern, buf2);
    mutt_pattern_func(shared->mailbox_view, MUTT_LIMIT, NULL);
  }
 
  if (((op == OP_LIMIT_CURRENT_THREAD) &&
       mutt_limit_current_thread(shared->mailbox_view, shared->email)) ||
      (op == OP_TOGGLE_READ) ||
      ((op == OP_MAIN_LIMIT) && (mutt_pattern_func(shared->mailbox_view, MUTT_LIMIT,
                                                   _("Limit to messages matching: ")) == 0)))
  {
    priv->menu->max = shared->mailbox->vcount;
    menu_set_index(priv->menu, 0);
    if (old_index >= 0)
    {
      /* try to find what used to be the current message */
      for (size_t i = 0; i < shared->mailbox->vcount; i++)
      {
        struct Email *e = mutt_get_virt_email(shared->mailbox, i);
        if (!e)
          continue;
        if (e->index == old_index)
        {
          menu_set_index(priv->menu, i);
          break;
        }
      }
    }
 
    if ((shared->mailbox->msg_count != 0) && mutt_using_threads())
    {
      const bool c_collapse_all = cs_subset_bool(shared->sub, "collapse_all");
      if (c_collapse_all)
        collapse_all(shared->mailbox_view, priv->menu, 0);
      mutt_draw_tree(shared->mailbox_view->threads);
    }
    menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  }
  if (lmt)
    mutt_message(_("To view all messages, limit to \"all\""));
 
  return FR_SUCCESS;
}
 
static int op_main_link_threads(struct IndexSharedData *shared,
                                struct IndexPrivateData *priv, int op)
{
  struct Mailbox *m = shared->mailbox;
  /* L10N: CHECK_ACL */
  if (!check_acl(m, MUTT_ACL_WRITE, _("Can't link threads")))
    return FR_ERROR;
 
  struct Email *e = shared->email;
  if (!e)
    return FR_NO_ACTION;
 
  enum FunctionRetval rc = FR_ERROR;
 
  if (!mutt_using_threads())
  {
    mutt_error(_("Threading is not enabled"));
  }
  else if (!e->env->message_id)
  {
    mutt_error(_("No Message-ID: header available to link thread"));
  }
  else
  {
    struct MailboxView *mv = shared->mailbox_view;
    struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
    ea_add_tagged(&ea, mv, NULL, true);
 
    if (mutt_link_threads(e, &ea, m))
    {
      mutt_sort_headers(mv, true);
      menu_set_index(priv->menu, e->vnum);
 
      m->changed = true;
      mutt_message(_("Threads linked"));
      rc = FR_SUCCESS;
    }
    else
    {
      mutt_error(_("No thread linked"));
      rc = FR_NO_ACTION;
    }
 
    ARRAY_FREE(&ea);
  }
 
  menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  return rc;
}
 
static int op_main_modify_tags(struct IndexSharedData *shared,
                               struct IndexPrivateData *priv, int op)
{
  int rc = FR_ERROR;
  struct Buffer *buf = NULL;
 
  if (!shared->mailbox)
    goto done;
  struct Mailbox *m = shared->mailbox;
  if (!mx_tags_is_supported(m))
  {
    mutt_message(_("Folder doesn't support tagging, aborting"));
    goto done;
  }
  if (!shared->email)
  {
    rc = FR_NO_ACTION;
    goto done;
  }
 
  struct Buffer *tags = buf_pool_get();
  if (!priv->tag_prefix)
    driver_tags_get_with_hidden(&shared->email->tags, tags);
  buf = buf_pool_get();
  int rc2 = mx_tags_edit(m, buf_string(tags), buf);
  buf_pool_release(&tags);
  if (rc2 < 0)
  {
    goto done;
  }
  else if (rc2 == 0)
  {
    mutt_message(_("No tag specified, aborting"));
    goto done;
  }
 
  if (priv->tag_prefix)
  {
    struct Progress *progress = NULL;
 
    if (m->verbose)
    {
      progress = progress_new(MUTT_PROGRESS_WRITE, m->msg_tagged);
      progress_set_message(progress, _("Update tags..."));
    }
 
#ifdef USE_NOTMUCH
    if (m->type == MUTT_NOTMUCH)
      nm_db_longrun_init(m, true);
#endif
    for (int px = 0, i = 0; i < m->msg_count; i++)
    {
      struct Email *e = m->emails[i];
      if (!e)
        break;
      if (!message_is_tagged(e))
        continue;
 
      progress_update(progress, ++px, -1);
      mx_tags_commit(m, e, buf_string(buf));
      e->attr_color = NULL;
      if (op == OP_MAIN_MODIFY_TAGS_THEN_HIDE)
      {
        bool still_queried = false;
#ifdef USE_NOTMUCH
        if (m->type == MUTT_NOTMUCH)
          still_queried = nm_message_is_still_queried(m, e);
#endif
        e->quasi_deleted = !still_queried;
        m->changed = true;
      }
    }
    progress_free(&progress);
#ifdef USE_NOTMUCH
    if (m->type == MUTT_NOTMUCH)
      nm_db_longrun_done(m);
#endif
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
  else
  {
    if (mx_tags_commit(m, shared->email, buf_string(buf)))
    {
      mutt_message(_("Failed to modify tags, aborting"));
      goto done;
    }
    shared->email->attr_color = NULL;
    if (op == OP_MAIN_MODIFY_TAGS_THEN_HIDE)
    {
      bool still_queried = false;
#ifdef USE_NOTMUCH
      if (m->type == MUTT_NOTMUCH)
        still_queried = nm_message_is_still_queried(m, shared->email);
#endif
      shared->email->quasi_deleted = !still_queried;
      m->changed = true;
    }
 
    resolve_email(priv, shared, RESOLVE_NEXT_UNDELETED);
  }
  rc = FR_SUCCESS;
 
done:
  buf_pool_release(&buf);
  return rc;
}
 
static int op_main_next_new(struct IndexSharedData *shared,
                            struct IndexPrivateData *priv, int op)
{
  int first_unread = -1;
  int first_new = -1;
 
  const int saved_current = menu_get_index(priv->menu);
  int mcur = saved_current;
  int index = -1;
  const bool threaded = mutt_using_threads();
  for (size_t i = 0; i != shared->mailbox->vcount; i++)
  {
    if ((op == OP_MAIN_NEXT_NEW) || (op == OP_MAIN_NEXT_UNREAD) ||
        (op == OP_MAIN_NEXT_NEW_THEN_UNREAD))
    {
      mcur++;
      if (mcur > (shared->mailbox->vcount - 1))
      {
        mcur = 0;
      }
    }
    else
    {
      mcur--;
      if (mcur < 0)
      {
        mcur = shared->mailbox->vcount - 1;
      }
    }
 
    struct Email *e = mutt_get_virt_email(shared->mailbox, mcur);
    if (!e)
      break;
    if (e->collapsed && threaded)
    {
      int unread = mutt_thread_contains_unread(e);
      if ((unread != 0) && (first_unread == -1))
        first_unread = mcur;
      if ((unread == 1) && (first_new == -1))
        first_new = mcur;
    }
    else if (!e->deleted && !e->read)
    {
      if (first_unread == -1)
        first_unread = mcur;
      if (!e->old && (first_new == -1))
        first_new = mcur;
    }
 
    if (((op == OP_MAIN_NEXT_UNREAD) || (op == OP_MAIN_PREV_UNREAD)) && (first_unread != -1))
    {
      break;
    }
    if (((op == OP_MAIN_NEXT_NEW) || (op == OP_MAIN_PREV_NEW) ||
         (op == OP_MAIN_NEXT_NEW_THEN_UNREAD) || (op == OP_MAIN_PREV_NEW_THEN_UNREAD)) &&
        (first_new != -1))
    {
      break;
    }
  }
  if (((op == OP_MAIN_NEXT_NEW) || (op == OP_MAIN_PREV_NEW) ||
       (op == OP_MAIN_NEXT_NEW_THEN_UNREAD) || (op == OP_MAIN_PREV_NEW_THEN_UNREAD)) &&
      (first_new != -1))
  {
    index = first_new;
  }
  else if (((op == OP_MAIN_NEXT_UNREAD) || (op == OP_MAIN_PREV_UNREAD) ||
            (op == OP_MAIN_NEXT_NEW_THEN_UNREAD) || (op == OP_MAIN_PREV_NEW_THEN_UNREAD)) &&
           (first_unread != -1))
  {
    index = first_unread;
  }
 
  if (index == -1)
  {
    menu_set_index(priv->menu, saved_current);
    if ((op == OP_MAIN_NEXT_NEW) || (op == OP_MAIN_PREV_NEW))
    {
      if (mview_has_limit(shared->mailbox_view))
        mutt_error(_("No new messages in this limited view"));
      else
        mutt_error(_("No new messages"));
    }
    else
    {
      if (mview_has_limit(shared->mailbox_view))
        mutt_error(_("No unread messages in this limited view"));
      else
        mutt_error(_("No unread messages"));
    }
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
    return FR_ERROR;
  }
  else
  {
    menu_set_index(priv->menu, index);
  }
 
  index = menu_get_index(priv->menu);
  if ((op == OP_MAIN_NEXT_NEW) || (op == OP_MAIN_NEXT_UNREAD) ||
      (op == OP_MAIN_NEXT_NEW_THEN_UNREAD))
  {
    if (saved_current > index)
    {
      mutt_message(_("Search wrapped to top"));
    }
  }
  else if (saved_current < index)
  {
    mutt_message(_("Search wrapped to bottom"));
  }
 
  return FR_SUCCESS;
}
 
static int op_main_next_thread(struct IndexSharedData *shared,
                               struct IndexPrivateData *priv, int op)
{
  int index = -1;
  switch (op)
  {
    case OP_MAIN_NEXT_THREAD:
      index = mutt_next_thread(shared->email);
      break;
 
    case OP_MAIN_NEXT_SUBTHREAD:
      index = mutt_next_subthread(shared->email);
      break;
 
    case OP_MAIN_PREV_THREAD:
      index = mutt_previous_thread(shared->email);
      break;
 
    case OP_MAIN_PREV_SUBTHREAD:
      index = mutt_previous_subthread(shared->email);
      break;
  }
 
  if (index != -1)
    menu_set_index(priv->menu, index);
 
  if (index < 0)
  {
    if ((op == OP_MAIN_NEXT_THREAD) || (op == OP_MAIN_NEXT_SUBTHREAD))
      mutt_error(_("No more threads"));
    else
      mutt_error(_("You are on the first thread"));
 
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
  }
 
  return FR_SUCCESS;
}
 
static int op_main_next_undeleted(struct IndexSharedData *shared,
                                  struct IndexPrivateData *priv, int op)
{
  int index = menu_get_index(priv->menu);
  if (index >= (shared->mailbox->vcount - 1))
  {
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
    mutt_message(_("You are on the last message"));
    return FR_ERROR;
  }
 
  const bool uncollapse = mutt_using_threads() && !window_is_focused(priv->win_index);
 
  index = find_next_undeleted(shared->mailbox_view, index, uncollapse);
  if (index != -1)
  {
    menu_set_index(priv->menu, index);
    if (uncollapse)
      menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
 
  if (index == -1)
  {
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
    mutt_error(_("No undeleted messages"));
  }
 
  return FR_SUCCESS;
}
 
static int op_main_next_unread_mailbox(struct IndexSharedData *shared,
                                       struct IndexPrivateData *priv, int op)
{
  struct Mailbox *m = shared->mailbox;
 
  struct Buffer *folderbuf = buf_pool_get();
  buf_strcpy(folderbuf, mailbox_path(m));
  m = mutt_mailbox_next_unread(m, folderbuf);
  buf_pool_release(&folderbuf);
 
  if (!m)
  {
    mutt_error(_("No mailboxes have new mail"));
    return FR_ERROR;
  }
 
  change_folder_mailbox(priv->menu, m, &priv->oldcount, shared, false);
  return FR_SUCCESS;
}
 
static int op_main_prev_undeleted(struct IndexSharedData *shared,
                                  struct IndexPrivateData *priv, int op)
{
  int index = menu_get_index(priv->menu);
  if (index < 1)
  {
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
    mutt_message(_("You are on the first message"));
    return FR_ERROR;
  }
 
  const bool uncollapse = mutt_using_threads() && !window_is_focused(priv->win_index);
 
  index = find_previous_undeleted(shared->mailbox_view, index, uncollapse);
  if (index != -1)
  {
    menu_set_index(priv->menu, index);
    if (uncollapse)
      menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
 
  if (index == -1)
  {
    mutt_error(_("No undeleted messages"));
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
  }
 
  return FR_SUCCESS;
}
 
static int op_main_quasi_delete(struct IndexSharedData *shared,
                                struct IndexPrivateData *priv, int op)
{
  if (priv->tag_prefix)
  {
    struct Mailbox *m = shared->mailbox;
    for (size_t i = 0; i < m->msg_count; i++)
    {
      struct Email *e = m->emails[i];
      if (!e)
        break;
      if (message_is_tagged(e))
      {
        e->quasi_deleted = true;
        m->changed = true;
      }
    }
  }
  else
  {
    if (!shared->email)
      return FR_NO_ACTION;
    shared->email->quasi_deleted = true;
    shared->mailbox->changed = true;
  }
 
  return FR_SUCCESS;
}
 
static int op_main_read_thread(struct IndexSharedData *shared,
                               struct IndexPrivateData *priv, int op)
{
  /* L10N: CHECK_ACL */
  /* L10N: Due to the implementation details we do not know whether we
     mark zero, 1, 12, ... messages as read. So in English we use
     "messages". Your language might have other means to express this. */
  if (!check_acl(shared->mailbox, MUTT_ACL_SEEN, _("Can't mark messages as read")))
    return FR_ERROR;
 
  int rc = mutt_thread_set_flag(shared->mailbox, shared->email, MUTT_READ, true,
                                (op != OP_MAIN_READ_THREAD));
  if (rc != -1)
  {
    const enum ResolveMethod rm = (op == OP_MAIN_READ_THREAD) ? RESOLVE_NEXT_THREAD :
                                                                RESOLVE_NEXT_SUBTHREAD;
    resolve_email(priv, shared, rm);
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
 
  return FR_SUCCESS;
}
 
static int op_main_root_message(struct IndexSharedData *shared,
                                struct IndexPrivateData *priv, int op)
{
  int index = mutt_parent_message(shared->email, op == OP_MAIN_ROOT_MESSAGE);
  if (index != -1)
    menu_set_index(priv->menu, index);
 
  return FR_SUCCESS;
}
 
static int op_main_set_flag(struct IndexSharedData *shared,
                            struct IndexPrivateData *priv, int op)
{
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
 
  if (mw_change_flag(shared->mailbox, &ea, (op == OP_MAIN_SET_FLAG)) == 0)
  {
    if (priv->tag_prefix)
    {
      menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
    }
    else
    {
      resolve_email(priv, shared, RESOLVE_NEXT_UNDELETED);
    }
  }
  ARRAY_FREE(&ea);
 
  return FR_SUCCESS;
}
 
static int op_main_show_limit(struct IndexSharedData *shared,
                              struct IndexPrivateData *priv, int op)
{
  if (mview_has_limit(shared->mailbox_view))
  {
    char buf2[256] = { 0 };
    /* L10N: ask for a limit to apply */
    snprintf(buf2, sizeof(buf2), _("Limit: %s"), shared->mailbox_view->pattern);
    mutt_message("%s", buf2);
  }
  else
  {
    mutt_message(_("No limit pattern is in effect"));
  }
 
  return FR_SUCCESS;
}
 
static int op_main_sync_folder(struct IndexSharedData *shared,
                               struct IndexPrivateData *priv, int op)
{
  if (!shared->mailbox || (shared->mailbox->msg_count == 0) || shared->mailbox->readonly)
    return FR_NO_ACTION;
 
  int ovc = shared->mailbox->vcount;
  int oc = shared->mailbox->msg_count;
  struct Email *e = NULL;
 
  /* don't attempt to move the cursor if there are no visible messages in the current limit */
  int index = menu_get_index(priv->menu);
  if (index < shared->mailbox->vcount)
  {
    /* threads may be reordered, so figure out what header the cursor
     * should be on. */
    int newidx = index;
    if (!shared->email)
      return FR_NO_ACTION;
    if (shared->email->deleted)
      newidx = find_next_undeleted(shared->mailbox_view, index, false);
    if (newidx < 0)
      newidx = find_previous_undeleted(shared->mailbox_view, index, false);
    if (newidx >= 0)
      e = mutt_get_virt_email(shared->mailbox, newidx);
  }
 
  enum MxStatus check = mx_mbox_sync(shared->mailbox);
  if (check == MX_STATUS_OK)
  {
    if (e && (shared->mailbox->vcount != ovc))
    {
      for (size_t i = 0; i < shared->mailbox->vcount; i++)
      {
        struct Email *e2 = mutt_get_virt_email(shared->mailbox, i);
        if (e2 == e)
        {
          menu_set_index(priv->menu, i);
          break;
        }
      }
    }
    mutt_pattern_free(&shared->search_state->pattern);
  }
  else if ((check == MX_STATUS_NEW_MAIL) || (check == MX_STATUS_REOPENED))
  {
    update_index(priv->menu, shared->mailbox_view, check, oc, shared);
  }
 
  /* do a sanity check even if mx_mbox_sync failed.  */
 
  index = menu_get_index(priv->menu);
  if ((index < 0) || (shared->mailbox && (index >= shared->mailbox->vcount)))
  {
    menu_set_index(priv->menu, find_first_message(shared->mailbox_view));
  }
 
  /* check for a fatal error, or all messages deleted */
  if (shared->mailbox && buf_is_empty(&shared->mailbox->pathbuf))
  {
    mview_free(&shared->mailbox_view);
  }
 
  priv->menu->max = shared->mailbox->vcount;
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  struct EventMailbox ev_m = { shared->mailbox };
  notify_send(shared->mailbox->notify, NT_MAILBOX, NT_MAILBOX_CHANGE, &ev_m);
 
  return FR_SUCCESS;
}
 
static int op_main_tag_pattern(struct IndexSharedData *shared,
                               struct IndexPrivateData *priv, int op)
{
  mutt_pattern_func(shared->mailbox_view, MUTT_TAG, _("Tag messages matching: "));
  menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
 
  return FR_SUCCESS;
}
 
static int op_main_undelete_pattern(struct IndexSharedData *shared,
                                    struct IndexPrivateData *priv, int op)
{
  /* L10N: CHECK_ACL */
  /* L10N: Due to the implementation details we do not know whether we
     undelete zero, 1, 12, ... messages. So in English we use
     "messages". Your language might have other means to express this. */
  if (!check_acl(shared->mailbox, MUTT_ACL_DELETE, _("Can't undelete messages")))
    return FR_ERROR;
 
  if (mutt_pattern_func(shared->mailbox_view, MUTT_UNDELETE,
                        _("Undelete messages matching: ")) == 0)
  {
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
 
  return FR_SUCCESS;
}
 
static int op_main_untag_pattern(struct IndexSharedData *shared,
                                 struct IndexPrivateData *priv, int op)
{
  if (mutt_pattern_func(shared->mailbox_view, MUTT_UNTAG, _("Untag messages matching: ")) == 0)
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
 
  return FR_SUCCESS;
}
 
static int op_mark_msg(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
 
  int rc = FR_SUCCESS;
 
  if (shared->email->env->message_id)
  {
    struct Buffer *buf = buf_pool_get();
 
    /* L10N: This is the prompt for <mark-message>.  Whatever they
       enter will be prefixed by $mark_macro_prefix and will become
       a macro hotkey to jump to the currently selected message. */
    if ((mw_get_field(_("Enter macro stroke: "), buf, MUTT_COMP_NO_FLAGS,
                      HC_OTHER, NULL, NULL) == 0) &&
        !buf_is_empty(buf))
    {
      const char *const c_mark_macro_prefix = cs_subset_string(shared->sub, "mark_macro_prefix");
      char str[256] = { 0 };
      snprintf(str, sizeof(str), "%s%s", c_mark_macro_prefix, buf_string(buf));
 
      struct Buffer *msg_id = buf_pool_get();
      mutt_file_sanitize_regex(msg_id, shared->email->env->message_id);
      char macro[256] = { 0 };
      snprintf(macro, sizeof(macro), "<search>~i '%s'\n", buf_string(msg_id));
      buf_pool_release(&msg_id);
 
      /* L10N: "message hotkey" is the key bindings menu description of a
         macro created by <mark-message>. */
      km_bind(str, MENU_INDEX, OP_MACRO, macro, _("message hotkey"));
 
      /* L10N: This is echoed after <mark-message> creates a new hotkey
         macro.  %s is the hotkey string ($mark_macro_prefix followed
         by whatever they typed at the prompt.) */
      buf_printf(buf, _("Message bound to %s"), str);
      mutt_message("%s", buf_string(buf));
      mutt_debug(LL_DEBUG1, "Mark: %s => %s\n", str, macro);
      buf_pool_release(&buf);
    }
  }
  else
  {
    /* L10N: This error is printed if <mark-message> can't find a
       Message-ID for the currently selected message in the index. */
    mutt_error(_("No message ID to macro"));
    rc = FR_ERROR;
  }
 
  return rc;
}
 
static int op_next_entry(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  const int index = menu_get_index(priv->menu) + 1;
  if (index >= shared->mailbox->vcount)
  {
    mutt_message(_("You are on the last message"));
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
    return FR_ERROR;
  }
  menu_set_index(priv->menu, index);
  return FR_SUCCESS;
}
 
static int op_pipe(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  mutt_pipe_message(shared->mailbox, &ea);
  ARRAY_FREE(&ea);
 
  /* in an IMAP folder index with imap_peek=no, piping could change
   * new or old messages status to read. Redraw what's needed.  */
  const bool c_imap_peek = cs_subset_bool(shared->sub, "imap_peek");
  if ((shared->mailbox->type == MUTT_IMAP) && !c_imap_peek)
  {
    menu_queue_redraw(priv->menu, (priv->tag_prefix ? MENU_REDRAW_INDEX : MENU_REDRAW_CURRENT));
  }
 
  return FR_SUCCESS;
}
 
static int op_prev_entry(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  int index = menu_get_index(priv->menu);
  if (index < 1)
  {
    notify_send(shared->notify, NT_INDEX, NT_INDEX_EMAIL, NULL);
    mutt_message(_("You are on the first message"));
    return FR_ERROR;
  }
  menu_set_index(priv->menu, index - 1);
  return FR_SUCCESS;
}
 
static int op_print(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  mutt_print_message(shared->mailbox, &ea);
  ARRAY_FREE(&ea);
 
  /* in an IMAP folder index with imap_peek=no, printing could change
   * new or old messages status to read. Redraw what's needed.  */
  const bool c_imap_peek = cs_subset_bool(shared->sub, "imap_peek");
  if ((shared->mailbox->type == MUTT_IMAP) && !c_imap_peek)
  {
    menu_queue_redraw(priv->menu, (priv->tag_prefix ? MENU_REDRAW_INDEX : MENU_REDRAW_CURRENT));
  }
 
  return FR_SUCCESS;
}
 
static int op_query(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  query_index(shared->mailbox, shared->sub);
  return FR_SUCCESS;
}
 
static int op_quit(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (shared->attach_msg)
    return FR_DONE;
 
  if (query_quadoption(_("Quit NeoMutt?"), shared->sub, "quit") == MUTT_YES)
  {
    priv->oldcount = shared->mailbox ? shared->mailbox->msg_count : 0;
 
    mutt_startup_shutdown_hook(MUTT_SHUTDOWN_HOOK);
    mutt_debug(LL_NOTIFY, "NT_GLOBAL_SHUTDOWN\n");
    notify_send(NeoMutt->notify, NT_GLOBAL, NT_GLOBAL_SHUTDOWN, NULL);
 
    enum MxStatus check = MX_STATUS_OK;
    if (!shared->mailbox_view || ((check = mx_mbox_close(shared->mailbox)) == MX_STATUS_OK))
    {
      mview_free(&shared->mailbox_view);
      mailbox_free(&shared->mailbox);
      return FR_DONE;
    }
 
    if ((check == MX_STATUS_NEW_MAIL) || (check == MX_STATUS_REOPENED))
    {
      update_index(priv->menu, shared->mailbox_view, check, priv->oldcount, shared);
    }
 
    menu_queue_redraw(priv->menu, MENU_REDRAW_FULL); /* new mail arrived? */
    mutt_pattern_free(&shared->search_state->pattern);
  }
 
  return FR_NO_ACTION;
}
 
static int op_recall_message(struct IndexSharedData *shared,
                             struct IndexPrivateData *priv, int op)
{
  int rc = mutt_send_message(SEND_POSTPONED, NULL, NULL, shared->mailbox, NULL,
                             shared->sub);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_reply(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
  const bool c_pgp_auto_decode = cs_subset_bool(shared->sub, "pgp_auto_decode");
  if (c_pgp_auto_decode &&
      (priv->tag_prefix || !(shared->email->security & PGP_TRADITIONAL_CHECKED)))
  {
    if (mutt_check_traditional_pgp(shared->mailbox, &ea))
      menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  }
  int rc = mutt_send_message(SEND_REPLY, NULL, NULL, shared->mailbox, &ea,
                             shared->sub);
  ARRAY_FREE(&ea);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_resend(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  int rc = -1;
  if (priv->tag_prefix)
  {
    struct Mailbox *m = shared->mailbox;
    for (size_t i = 0; i < m->msg_count; i++)
    {
      struct Email *e = m->emails[i];
      if (!e)
        break;
      if (message_is_tagged(e))
        rc = mutt_resend_message(NULL, shared->mailbox, e, shared->sub);
    }
  }
  else
  {
    rc = mutt_resend_message(NULL, shared->mailbox, shared->email, shared->sub);
  }
 
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_save(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (((op == OP_DECRYPT_COPY) || (op == OP_DECRYPT_SAVE)) && !WithCrypto)
    return FR_NOT_IMPL;
 
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
 
  const enum MessageSaveOpt save_opt = ((op == OP_SAVE) || (op == OP_DECODE_SAVE) ||
                                        (op == OP_DECRYPT_SAVE)) ?
                                           SAVE_MOVE :
                                           SAVE_COPY;
 
  enum MessageTransformOpt transform_opt =
      ((op == OP_DECODE_SAVE) || (op == OP_DECODE_COPY))   ? TRANSFORM_DECODE :
      ((op == OP_DECRYPT_SAVE) || (op == OP_DECRYPT_COPY)) ? TRANSFORM_DECRYPT :
                                                             TRANSFORM_NONE;
 
  const int rc = mutt_save_message(shared->mailbox, &ea, save_opt, transform_opt);
  if ((rc == 0) && (save_opt == SAVE_MOVE))
  {
    resolve_email(priv, shared, RESOLVE_NEXT_UNDELETED);
  }
  ARRAY_FREE(&ea);
 
  if (priv->tag_prefix)
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
 
  return (rc == -1) ? FR_ERROR : FR_SUCCESS;
}
 
static int op_search(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  SearchFlags flags = SEARCH_NO_FLAGS;
  switch (op)
  {
    case OP_SEARCH:
      flags |= SEARCH_PROMPT;
      shared->search_state->reverse = false;
      break;
    case OP_SEARCH_REVERSE:
      flags |= SEARCH_PROMPT;
      shared->search_state->reverse = true;
      break;
    case OP_SEARCH_NEXT:
      break;
    case OP_SEARCH_OPPOSITE:
      flags |= SEARCH_OPPOSITE;
      break;
  }
 
  // Initiating a search can happen on an empty mailbox, but
  // searching for next/previous/... needs to be on a message and
  // thus a non-empty mailbox
  int index = menu_get_index(priv->menu);
  index = mutt_search_command(shared->mailbox_view, priv->menu, index,
                              shared->search_state, flags);
  if (index != -1)
    menu_set_index(priv->menu, index);
 
  return FR_SUCCESS;
}
 
static int op_sort(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (!mutt_select_sort(op == OP_SORT_REVERSE))
    return FR_ERROR;
 
  if (shared->mailbox && (shared->mailbox->msg_count != 0))
  {
    resort_index(shared->mailbox_view, priv->menu);
    mutt_pattern_free(&shared->search_state->pattern);
  }
 
  return FR_SUCCESS;
}
 
static int op_tag(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  const bool c_auto_tag = cs_subset_bool(shared->sub, "auto_tag");
  if (priv->tag_prefix && !c_auto_tag)
  {
    struct Mailbox *m = shared->mailbox;
    for (size_t i = 0; i < m->msg_count; i++)
    {
      struct Email *e = m->emails[i];
      if (!e)
        break;
      if (e->visible)
        mutt_set_flag(m, e, MUTT_TAG, false, true);
    }
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
    return FR_SUCCESS;
  }
 
  if (!shared->email)
    return FR_NO_ACTION;
 
  mutt_set_flag(shared->mailbox, shared->email, MUTT_TAG, !shared->email->tagged, true);
 
  resolve_email(priv, shared, RESOLVE_NEXT_EMAIL);
  return FR_SUCCESS;
}
 
static int op_tag_thread(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
 
  int rc = mutt_thread_set_flag(shared->mailbox, shared->email, MUTT_TAG,
                                !shared->email->tagged, (op != OP_TAG_THREAD));
  if (rc != -1)
  {
    const enum ResolveMethod rm = (op == OP_TAG_THREAD) ? RESOLVE_NEXT_THREAD :
                                                          RESOLVE_NEXT_SUBTHREAD;
    resolve_email(priv, shared, rm);
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
 
  return FR_SUCCESS;
}
 
static int op_toggle_new(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  /* L10N: CHECK_ACL */
  if (!check_acl(shared->mailbox, MUTT_ACL_SEEN, _("Can't toggle new")))
    return FR_ERROR;
 
  struct Mailbox *m = shared->mailbox;
  if (priv->tag_prefix)
  {
    for (size_t i = 0; i < m->msg_count; i++)
    {
      struct Email *e = m->emails[i];
      if (!e)
        break;
      if (!message_is_tagged(e))
        continue;
 
      if (e->read || e->old)
        mutt_set_flag(m, e, MUTT_NEW, true, true);
      else
        mutt_set_flag(m, e, MUTT_READ, true, true);
    }
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
  else
  {
    if (!shared->email)
      return FR_NO_ACTION;
    if (shared->email->read || shared->email->old)
      mutt_set_flag(m, shared->email, MUTT_NEW, true, true);
    else
      mutt_set_flag(m, shared->email, MUTT_READ, true, true);
 
    resolve_email(priv, shared, RESOLVE_NEXT_UNDELETED);
  }
 
  return FR_SUCCESS;
}
 
static int op_toggle_write(struct IndexSharedData *shared,
                           struct IndexPrivateData *priv, int op)
{
  mx_toggle_write(shared->mailbox);
  return FR_SUCCESS;
}
 
static int op_undelete(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  /* L10N: CHECK_ACL */
  if (!check_acl(shared->mailbox, MUTT_ACL_DELETE, _("Can't undelete message")))
    return FR_ERROR;
 
  struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
  ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
 
  mutt_emails_set_flag(shared->mailbox, &ea, MUTT_DELETE, false);
  mutt_emails_set_flag(shared->mailbox, &ea, MUTT_PURGE, false);
  ARRAY_FREE(&ea);
 
  if (priv->tag_prefix)
  {
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
  else
  {
    resolve_email(priv, shared, RESOLVE_NEXT_EMAIL);
  }
 
  return FR_SUCCESS;
}
 
static int op_undelete_thread(struct IndexSharedData *shared,
                              struct IndexPrivateData *priv, int op)
{
  /* L10N: CHECK_ACL */
  /* L10N: Due to the implementation details we do not know whether we
     undelete zero, 1, 12, ... messages. So in English we use
     "messages". Your language might have other means to express this. */
  if (!check_acl(shared->mailbox, MUTT_ACL_DELETE, _("Can't undelete messages")))
    return FR_ERROR;
 
  int rc = mutt_thread_set_flag(shared->mailbox, shared->email, MUTT_DELETE,
                                false, (op != OP_UNDELETE_THREAD));
  if (rc != -1)
  {
    rc = mutt_thread_set_flag(shared->mailbox, shared->email, MUTT_PURGE, false,
                              (op != OP_UNDELETE_THREAD));
  }
  if (rc != -1)
  {
    const enum ResolveMethod rm = (op == OP_UNDELETE_THREAD) ? RESOLVE_NEXT_THREAD :
                                                               RESOLVE_NEXT_SUBTHREAD;
    resolve_email(priv, shared, rm);
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
 
  return FR_SUCCESS;
}
 
static int op_view_attachments(struct IndexSharedData *shared,
                               struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
 
  enum FunctionRetval rc = FR_ERROR;
  struct Message *msg = mx_msg_open(shared->mailbox, shared->email);
  if (msg)
  {
    dlg_attachment(NeoMutt->sub, shared->mailbox_view, shared->email, msg->fp,
                   shared->attach_msg);
    if (shared->email->attach_del)
    {
      shared->mailbox->changed = true;
    }
    mx_msg_close(shared->mailbox, &msg);
    rc = FR_SUCCESS;
  }
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  return rc;
}
 
// -----------------------------------------------------------------------------
 
#ifdef USE_AUTOCRYPT
static int op_autocrypt_acct_menu(struct IndexSharedData *shared,
                                  struct IndexPrivateData *priv, int op)
{
  dlg_autocrypt();
  return FR_SUCCESS;
}
#endif
 
static int op_main_imap_fetch(struct IndexSharedData *shared,
                              struct IndexPrivateData *priv, int op)
{
  if (!shared->mailbox || (shared->mailbox->type != MUTT_IMAP))
    return FR_NO_ACTION;
 
  imap_check_mailbox(shared->mailbox, true);
  return FR_SUCCESS;
}
 
static int op_main_imap_logout_all(struct IndexSharedData *shared,
                                   struct IndexPrivateData *priv, int op)
{
  if (shared->mailbox && (shared->mailbox->type == MUTT_IMAP))
  {
    const enum MxStatus check = mx_mbox_close(shared->mailbox);
    if (check == MX_STATUS_OK)
    {
      mview_free(&shared->mailbox_view);
    }
    else
    {
      if ((check == MX_STATUS_NEW_MAIL) || (check == MX_STATUS_REOPENED))
      {
        update_index(priv->menu, shared->mailbox_view, check, priv->oldcount, shared);
      }
      mutt_pattern_free(&shared->search_state->pattern);
      menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
      return FR_ERROR;
    }
  }
  imap_logout_all();
  mutt_message(_("Logged out of IMAP servers"));
  mutt_pattern_free(&shared->search_state->pattern);
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
 
  return FR_SUCCESS;
}
 
static int op_catchup(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  struct Mailbox *m = shared->mailbox;
  if (!m || (m->type != MUTT_NNTP))
    return FR_NO_ACTION;
 
  struct NntpMboxData *mdata = m->mdata;
  if (mutt_newsgroup_catchup(m, mdata->adata, mdata->group))
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
 
  return FR_SUCCESS;
}
 
static int op_get_children(struct IndexSharedData *shared,
                           struct IndexPrivateData *priv, int op)
{
  struct Mailbox *m = shared->mailbox;
  if (m->type != MUTT_NNTP)
    return FR_ERROR;
 
  struct Email *e = shared->email;
  if (!e)
    return FR_NO_ACTION;
 
  char buf[PATH_MAX] = { 0 };
  int oldmsgcount = m->msg_count;
  int oldindex = e->index;
  int rc = 0;
 
  if (!e->env->message_id)
  {
    mutt_error(_("No Message-Id. Unable to perform operation."));
    return FR_ERROR;
  }
 
  mutt_message(_("Fetching message headers..."));
  if (!m->id_hash)
    m->id_hash = mutt_make_id_hash(m);
  mutt_str_copy(buf, e->env->message_id, sizeof(buf));
 
  /* trying to find msgid of the root message */
  if (op == OP_RECONSTRUCT_THREAD)
  {
    struct ListNode *ref = NULL;
    STAILQ_FOREACH(ref, &e->env->references, entries)
    {
      if (!mutt_hash_find(m->id_hash, ref->data))
      {
        rc = nntp_check_msgid(m, ref->data);
        if (rc < 0)
          return FR_ERROR;
      }
 
      /* the last msgid in References is the root message */
      if (!STAILQ_NEXT(ref, entries))
        mutt_str_copy(buf, ref->data, sizeof(buf));
    }
  }
 
  /* fetching all child messages */
  rc = nntp_check_children(m, buf);
 
  /* at least one message has been loaded */
  if (m->msg_count > oldmsgcount)
  {
    bool verbose = m->verbose;
 
    if (rc < 0)
      m->verbose = false;
 
    struct MailboxView *mv = shared->mailbox_view;
    mutt_sort_headers(mv, (op == OP_RECONSTRUCT_THREAD));
    m->verbose = verbose;
 
    /* if the root message was retrieved, move to it */
    struct Email *e2 = mutt_hash_find(m->id_hash, buf);
    if (e2)
    {
      menu_set_index(priv->menu, e2->vnum);
    }
    else
    {
      /* try to restore old position */
      for (int i = 0; i < m->msg_count; i++)
      {
        e2 = m->emails[i];
        if (!e2)
          break;
        if (e2->index == oldindex)
        {
          menu_set_index(priv->menu, e2->vnum);
          /* as an added courtesy, recenter the menu
           * with the current entry at the middle of the screen */
          menu_current_middle(priv->menu);
        }
      }
    }
    menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  }
  else if (rc >= 0)
  {
    mutt_error(_("No deleted messages found in the thread"));
  }
 
  return FR_SUCCESS;
}
 
static int op_get_message(struct IndexSharedData *shared,
                          struct IndexPrivateData *priv, int op)
{
  struct Mailbox *m = shared->mailbox;
  if (m->type != MUTT_NNTP)
    return FR_SUCCESS;
 
  int rc = FR_ERROR;
  struct Buffer *buf = buf_pool_get();
 
  if (op == OP_GET_MESSAGE)
  {
    if ((mw_get_field(_("Enter Message-Id: "), buf, MUTT_COMP_NO_FLAGS,
                      HC_OTHER, NULL, NULL) != 0) ||
        buf_is_empty(buf))
    {
      goto done;
    }
  }
  else
  {
    struct Email *e = shared->email;
    if (!e || STAILQ_EMPTY(&e->env->references))
    {
      mutt_error(_("Article has no parent reference"));
      goto done;
    }
    buf_strcpy(buf, STAILQ_FIRST(&e->env->references)->data);
  }
 
  if (!m->id_hash)
    m->id_hash = mutt_make_id_hash(m);
  struct Email *e = mutt_hash_find(m->id_hash, buf_string(buf));
  if (e)
  {
    if (e->vnum != -1)
    {
      menu_set_index(priv->menu, e->vnum);
    }
    else if (e->collapsed)
    {
      mutt_uncollapse_thread(e);
      mutt_set_vnum(m);
      menu_set_index(priv->menu, e->vnum);
    }
    else
    {
      mutt_error(_("Message is not visible in limited view"));
    }
  }
  else
  {
    mutt_message(_("Fetching %s from server..."), buf_string(buf));
    int rc2 = nntp_check_msgid(m, buf_string(buf));
    if (rc2 == 0)
    {
      e = m->emails[m->msg_count - 1];
      struct MailboxView *mv = shared->mailbox_view;
      mutt_sort_headers(mv, false);
      menu_set_index(priv->menu, e->vnum);
      menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
      rc = FR_SUCCESS;
    }
    else if (rc2 > 0)
    {
      mutt_error(_("Article %s not found on the server"), buf_string(buf));
    }
  }
 
done:
  buf_pool_release(&buf);
  return rc;
}
 
static int op_main_change_group(struct IndexSharedData *shared,
                                struct IndexPrivateData *priv, int op)
{
  struct Buffer *folderbuf = buf_pool_get();
  buf_alloc(folderbuf, PATH_MAX);
 
  OptNews = false;
  bool read_only;
  char *cp = NULL;
  const bool c_read_only = cs_subset_bool(shared->sub, "read_only");
  if (shared->attach_msg || c_read_only || (op == OP_MAIN_CHANGE_GROUP_READONLY))
  {
    cp = _("Open newsgroup in read-only mode");
    read_only = true;
  }
  else
  {
    cp = _("Open newsgroup");
    read_only = false;
  }
 
  const bool c_change_folder_next = cs_subset_bool(shared->sub, "change_folder_next");
  if (c_change_folder_next && shared->mailbox && !buf_is_empty(&shared->mailbox->pathbuf))
  {
    buf_strcpy(folderbuf, mailbox_path(shared->mailbox));
    buf_pretty_mailbox(folderbuf);
  }
 
  OptNews = true;
  const char *const c_news_server = cs_subset_string(shared->sub, "news_server");
  if (!CurrentNewsSrv)
    CurrentNewsSrv = nntp_select_server(shared->mailbox, c_news_server, false);
  if (!CurrentNewsSrv)
    goto changefoldercleanup2;
 
  nntp_mailbox(shared->mailbox, folderbuf->data, folderbuf->dsize);
 
  if (mw_enter_fname(cp, folderbuf, true, shared->mailbox, false, NULL, NULL,
                     MUTT_SEL_NO_FLAGS) == -1)
  {
    goto changefoldercleanup2;
  }
 
  /* Selected directory is okay, let's save it. */
  mutt_browser_select_dir(buf_string(folderbuf));
 
  if (buf_is_empty(folderbuf))
  {
    msgwin_clear_text(NULL);
    goto changefoldercleanup2;
  }
 
  struct Mailbox *m = mx_mbox_find2(buf_string(folderbuf));
  if (m)
  {
    change_folder_mailbox(priv->menu, m, &priv->oldcount, shared, read_only);
  }
  else
  {
    change_folder_string(priv->menu, folderbuf, &priv->oldcount, shared, read_only);
  }
  struct MuttWindow *dlg = dialog_find(priv->win_index);
  dlg->help_data = IndexNewsHelp;
 
changefoldercleanup2:
  buf_pool_release(&folderbuf);
  return FR_SUCCESS;
}
 
static int op_post(struct IndexSharedData *shared, struct IndexPrivateData *priv, int op)
{
  if (!shared->email)
    return FR_NO_ACTION;
 
  if ((op != OP_FOLLOWUP) || !shared->email->env->followup_to ||
      !mutt_istr_equal(shared->email->env->followup_to, "poster") ||
      (query_quadoption(_("Reply by mail as poster prefers?"), shared->sub,
                        "followup_to_poster") != MUTT_YES))
  {
    if (shared->mailbox && (shared->mailbox->type == MUTT_NNTP) &&
        !((struct NntpMboxData *) shared->mailbox->mdata)->allowed &&
        (query_quadoption(_("Posting to this group not allowed, may be moderated. Continue?"),
                          shared->sub, "post_moderated") != MUTT_YES))
    {
      return FR_ERROR;
    }
    if (op == OP_POST)
    {
      mutt_send_message(SEND_NEWS, NULL, NULL, shared->mailbox, NULL, shared->sub);
    }
    else
    {
      struct EmailArray ea = ARRAY_HEAD_INITIALIZER;
      ea_add_tagged(&ea, shared->mailbox_view, shared->email, priv->tag_prefix);
      mutt_send_message(((op == OP_FOLLOWUP) ? SEND_REPLY : SEND_FORWARD) | SEND_NEWS,
                        NULL, NULL, shared->mailbox, &ea, shared->sub);
      ARRAY_FREE(&ea);
    }
    menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
    return FR_SUCCESS;
  }
 
  return op_reply(shared, priv, OP_REPLY);
}
 
#ifdef USE_NOTMUCH
static int op_main_entire_thread(struct IndexSharedData *shared,
                                 struct IndexPrivateData *priv, int op)
{
  if (shared->mailbox->type != MUTT_NOTMUCH)
  {
    if (((shared->mailbox->type != MUTT_MH) && (shared->mailbox->type != MUTT_MAILDIR)) ||
        (!shared->email || !shared->email->env || !shared->email->env->message_id))
    {
      mutt_message(_("No virtual folder and no Message-Id, aborting"));
      return FR_ERROR;
    } // no virtual folder, but we have message-id, reconstruct thread on-the-fly
 
    struct Buffer *buf = buf_pool_get();
    buf_alloc(buf, PATH_MAX);
    buf_addstr(buf, "id:");
 
    int msg_id_offset = 0;
    if ((shared->email->env->message_id)[0] == '<')
      msg_id_offset = 1;
 
    buf_addstr(buf, shared->email->env->message_id + msg_id_offset);
 
    size_t len = buf_len(buf);
    ASSERT(len > 0);
    if (buf->data[len - 1] == '>')
      buf->data[len - 1] = '\0';
 
    change_folder_notmuch(priv->menu, buf->data, buf->dsize, &priv->oldcount, shared, false);
    buf_pool_release(&buf);
 
    // If notmuch doesn't contain the message, we're left in an empty
    // vfolder. No messages are found, but nm_read_entire_thread assumes
    // a valid message-id and will throw a segfault.
    //
    // To prevent that, stay in the empty vfolder and print an error.
    if (shared->mailbox->msg_count == 0)
    {
      mutt_error(_("failed to find message in notmuch database. try running 'notmuch new'."));
      return FR_ERROR;
    }
  }
  priv->oldcount = shared->mailbox->msg_count;
  int index = menu_get_index(priv->menu);
  struct Email *e_oldcur = mutt_get_virt_email(shared->mailbox, index);
  if (!e_oldcur)
    return FR_ERROR;
 
  if (nm_read_entire_thread(shared->mailbox, e_oldcur) < 0)
  {
    mutt_message(_("Failed to read thread, aborting"));
    return FR_ERROR;
  }
 
  // nm_read_entire_thread() may modify msg_count and menu won't be updated.
  priv->menu->max = shared->mailbox->msg_count;
 
  if (priv->oldcount < shared->mailbox->msg_count)
  {
    /* nm_read_entire_thread() triggers mutt_sort_headers() if necessary */
    index = e_oldcur->vnum;
    if (e_oldcur->collapsed || shared->mailbox_view->collapsed)
    {
      index = mutt_uncollapse_thread(e_oldcur);
      mutt_set_vnum(shared->mailbox);
    }
    menu_set_index(priv->menu, index);
    menu_queue_redraw(priv->menu, MENU_REDRAW_INDEX);
  }
 
  return FR_SUCCESS;
}
 
static int op_main_vfolder_from_query(struct IndexSharedData *shared,
                                      struct IndexPrivateData *priv, int op)
{
  int rc = FR_SUCCESS;
  struct Buffer *buf = buf_pool_get();
 
  if ((mw_get_field("Query: ", buf, MUTT_COMP_NO_FLAGS, HC_OTHER,
                    &CompleteNmQueryOps, NULL) != 0) ||
      buf_is_empty(buf))
  {
    mutt_message(_("No query, aborting"));
    rc = FR_NO_ACTION;
    goto done;
  }
 
  // Keep copy of user's query to name the mailbox
  char *query_unencoded = buf_strdup(buf);
 
  buf_alloc(buf, PATH_MAX);
  struct Mailbox *m_query = change_folder_notmuch(priv->menu, buf->data, buf->dsize,
                                                  &priv->oldcount, shared,
                                                  (op == OP_MAIN_VFOLDER_FROM_QUERY_READONLY));
  if (m_query)
  {
    FREE(&m_query->name);
    m_query->name = query_unencoded;
    query_unencoded = NULL;
    rc = FR_SUCCESS;
  }
  else
  {
    FREE(&query_unencoded);
  }
 
done:
  buf_pool_release(&buf);
  return rc;
}
 
static int op_main_windowed_vfolder(struct IndexSharedData *shared,
                                    struct IndexPrivateData *priv, int op)
{
  // Common guard clauses.
  if (!nm_query_window_available())
  {
    mutt_message(_("Windowed queries disabled"));
    return FR_ERROR;
  }
  const char *const c_nm_query_window_current_search = cs_subset_string(shared->sub, "nm_query_window_current_search");
  if (!c_nm_query_window_current_search)
  {
    mutt_message(_("No notmuch vfolder currently loaded"));
    return FR_ERROR;
  }
 
  // Call the specific operation.
  switch (op)
  {
    case OP_MAIN_WINDOWED_VFOLDER_BACKWARD:
      nm_query_window_backward();
      break;
    case OP_MAIN_WINDOWED_VFOLDER_FORWARD:
      nm_query_window_forward();
      break;
    case OP_MAIN_WINDOWED_VFOLDER_RESET:
      nm_query_window_reset();
      break;
  }
 
  // Common query window folder change.
  char buf[PATH_MAX] = { 0 };
  mutt_str_copy(buf, c_nm_query_window_current_search, sizeof(buf));
  change_folder_notmuch(priv->menu, buf, sizeof(buf), &priv->oldcount, shared, false);
 
  return FR_SUCCESS;
}
#endif
 
static int op_main_fetch_mail(struct IndexSharedData *shared,
                              struct IndexPrivateData *priv, int op)
{
  pop_fetch_mail();
  menu_queue_redraw(priv->menu, MENU_REDRAW_FULL);
  return FR_SUCCESS;
}
 
// -----------------------------------------------------------------------------
 
static bool prereq(struct IndexSharedData *shared, struct Menu *menu, CheckFlags checks)
{
  bool result = true;
  struct MailboxView *mv = shared->mailbox_view;
 
  if (checks & (CHECK_MSGCOUNT | CHECK_VISIBLE | CHECK_READONLY))
    checks |= CHECK_IN_MAILBOX;
 
  if ((checks & CHECK_IN_MAILBOX) && (!mv || !mv->mailbox))
  {
    mutt_error(_("No mailbox is open"));
    result = false;
  }
 
  if (result && (checks & CHECK_MSGCOUNT) && (mv->mailbox->msg_count == 0))
  {
    mutt_error(_("There are no messages"));
    result = false;
  }
 
  int index = menu_get_index(menu);
  if (result && (checks & CHECK_VISIBLE) &&
      ((index < 0) || (index >= mv->mailbox->vcount)))
  {
    mutt_error(_("No visible messages"));
    result = false;
  }
 
  if (result && (checks & CHECK_READONLY) && mv->mailbox->readonly)
  {
    mutt_error(_("Mailbox is read-only"));
    result = false;
  }
 
  if (result && (checks & CHECK_ATTACH) && shared->attach_msg)
  {
    mutt_error(_("Function not permitted in attach-message mode"));
    result = false;
  }
 
  if (!result)
    mutt_flushinp();
 
  return result;
}
 
static const struct IndexFunction IndexFunctions[] = {
  // clang-format off
  { OP_ALIAS_DIALOG,                        op_alias_dialog,                      CHECK_NO_FLAGS },
  { OP_ATTACHMENT_EDIT_TYPE,                op_attachment_edit_type,              CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_BOUNCE_MESSAGE,                      op_bounce_message,                    CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_CATCHUP,                             op_catchup,                           CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY },
  { OP_CHECK_TRADITIONAL,                   op_check_traditional,                 CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_COMPOSE_TO_SENDER,                   op_compose_to_sender,                 CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_COPY_MESSAGE,                        op_save,                              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_CREATE_ALIAS,                        op_create_alias,                      CHECK_NO_FLAGS },
  { OP_DECODE_COPY,                         op_save,                              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_DECODE_SAVE,                         op_save,                              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_DECRYPT_COPY,                        op_save,                              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_DECRYPT_SAVE,                        op_save,                              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_DELETE,                              op_delete,                            CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_DELETE_SUBTHREAD,                    op_delete_thread,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_DELETE_THREAD,                       op_delete_thread,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_DISPLAY_ADDRESS,                     op_display_address,                   CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_DISPLAY_HEADERS,                     op_display_message,                   CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_DISPLAY_MESSAGE,                     op_display_message,                   CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_EDIT_LABEL,                          op_edit_label,                        CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_EDIT_OR_VIEW_RAW_MESSAGE,            op_edit_raw_message,                  CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_EDIT_RAW_MESSAGE,                    op_edit_raw_message,                  CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_END_COND,                            op_end_cond,                          CHECK_NO_FLAGS },
  { OP_EXIT,                                op_exit,                              CHECK_NO_FLAGS },
  { OP_EXTRACT_KEYS,                        op_extract_keys,                      CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_FLAG_MESSAGE,                        op_flag_message,                      CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_FOLLOWUP,                            op_post,                              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_FORGET_PASSPHRASE,                   op_forget_passphrase,                 CHECK_NO_FLAGS },
  { OP_FORWARD_MESSAGE,                     op_forward_message,                   CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_FORWARD_TO_GROUP,                    op_post,                              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_GET_CHILDREN,                        op_get_children,                      CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_GET_MESSAGE,                         op_get_message,                       CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_READONLY },
  { OP_GET_PARENT,                          op_get_message,                       CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_GENERIC_SELECT_ENTRY,                op_display_message,                   CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_GROUP_CHAT_REPLY,                    op_group_reply,                       CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_GROUP_REPLY,                         op_group_reply,                       CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_JUMP,                                op_jump,                              CHECK_IN_MAILBOX },
  { OP_JUMP_1,                              op_jump,                              CHECK_IN_MAILBOX },
  { OP_JUMP_2,                              op_jump,                              CHECK_IN_MAILBOX },
  { OP_JUMP_3,                              op_jump,                              CHECK_IN_MAILBOX },
  { OP_JUMP_4,                              op_jump,                              CHECK_IN_MAILBOX },
  { OP_JUMP_5,                              op_jump,                              CHECK_IN_MAILBOX },
  { OP_JUMP_6,                              op_jump,                              CHECK_IN_MAILBOX },
  { OP_JUMP_7,                              op_jump,                              CHECK_IN_MAILBOX },
  { OP_JUMP_8,                              op_jump,                              CHECK_IN_MAILBOX },
  { OP_JUMP_9,                              op_jump,                              CHECK_IN_MAILBOX },
  { OP_LIMIT_CURRENT_THREAD,                op_main_limit,                        CHECK_IN_MAILBOX },
  { OP_LIST_REPLY,                          op_list_reply,                        CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_LIST_SUBSCRIBE,                      op_list_subscribe,                    CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_LIST_UNSUBSCRIBE,                    op_list_unsubscribe,                  CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIL,                                op_mail,                              CHECK_ATTACH },
  { OP_MAILBOX_LIST,                        op_mailbox_list,                      CHECK_NO_FLAGS },
  { OP_MAIL_KEY,                            op_mail_key,                          CHECK_ATTACH },
  { OP_MAIN_BREAK_THREAD,                   op_main_break_thread,                 CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_MAIN_CHANGE_FOLDER,                  op_main_change_folder,                CHECK_NO_FLAGS },
  { OP_MAIN_CHANGE_FOLDER_READONLY,         op_main_change_folder,                CHECK_NO_FLAGS },
  { OP_MAIN_CHANGE_GROUP,                   op_main_change_group,                 CHECK_NO_FLAGS },
  { OP_MAIN_CHANGE_GROUP_READONLY,          op_main_change_group,                 CHECK_NO_FLAGS },
  { OP_MAIN_CLEAR_FLAG,                     op_main_set_flag,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_MAIN_COLLAPSE_ALL,                   op_main_collapse_all,                 CHECK_IN_MAILBOX },
  { OP_MAIN_COLLAPSE_THREAD,                op_main_collapse_thread,              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_DELETE_PATTERN,                 op_main_delete_pattern,               CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_READONLY },
  { OP_MAIN_FETCH_MAIL,                     op_main_fetch_mail,                   CHECK_ATTACH },
  { OP_MAIN_IMAP_FETCH,                     op_main_imap_fetch,                   CHECK_NO_FLAGS },
  { OP_MAIN_IMAP_LOGOUT_ALL,                op_main_imap_logout_all,              CHECK_NO_FLAGS },
  { OP_MAIN_LIMIT,                          op_main_limit,                        CHECK_IN_MAILBOX },
  { OP_MAIN_LINK_THREADS,                   op_main_link_threads,                 CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_MAIN_MODIFY_TAGS,                    op_main_modify_tags,                  CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_MAIN_MODIFY_TAGS_THEN_HIDE,          op_main_modify_tags,                  CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_MAIN_NEXT_NEW,                       op_main_next_new,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_NEXT_NEW_THEN_UNREAD,           op_main_next_new,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_NEXT_SUBTHREAD,                 op_main_next_thread,                  CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_NEXT_THREAD,                    op_main_next_thread,                  CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_NEXT_UNDELETED,                 op_main_next_undeleted,               CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_NEXT_UNREAD,                    op_main_next_new,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_NEXT_UNREAD_MAILBOX,            op_main_next_unread_mailbox,          CHECK_IN_MAILBOX },
  { OP_MAIN_PARENT_MESSAGE,                 op_main_root_message,                 CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_PREV_NEW,                       op_main_next_new,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_PREV_NEW_THEN_UNREAD,           op_main_next_new,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_PREV_SUBTHREAD,                 op_main_next_thread,                  CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_PREV_THREAD,                    op_main_next_thread,                  CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_PREV_UNDELETED,                 op_main_prev_undeleted,               CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_PREV_UNREAD,                    op_main_next_new,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_QUASI_DELETE,                   op_main_quasi_delete,                 CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_READ_SUBTHREAD,                 op_main_read_thread,                  CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_MAIN_READ_THREAD,                    op_main_read_thread,                  CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_MAIN_ROOT_MESSAGE,                   op_main_root_message,                 CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_SET_FLAG,                       op_main_set_flag,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_MAIN_SHOW_LIMIT,                     op_main_show_limit,                   CHECK_IN_MAILBOX },
  { OP_MAIN_SYNC_FOLDER,                    op_main_sync_folder,                  CHECK_NO_FLAGS },
  { OP_MAIN_TAG_PATTERN,                    op_main_tag_pattern,                  CHECK_IN_MAILBOX },
  { OP_MAIN_UNDELETE_PATTERN,               op_main_undelete_pattern,             CHECK_IN_MAILBOX | CHECK_READONLY },
  { OP_MAIN_UNTAG_PATTERN,                  op_main_untag_pattern,                CHECK_IN_MAILBOX },
  { OP_MARK_MSG,                            op_mark_msg,                          CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_NEXT_ENTRY,                          op_next_entry,                        CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_PIPE,                                op_pipe,                              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_POST,                                op_post,                              CHECK_ATTACH | CHECK_IN_MAILBOX },
  { OP_PREV_ENTRY,                          op_prev_entry,                        CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_PRINT,                               op_print,                             CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_PURGE_MESSAGE,                       op_delete,                            CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_PURGE_THREAD,                        op_delete_thread,                     CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_QUERY,                               op_query,                             CHECK_ATTACH },
  { OP_QUIT,                                op_quit,                              CHECK_NO_FLAGS },
  { OP_RECALL_MESSAGE,                      op_recall_message,                    CHECK_ATTACH },
  { OP_RECONSTRUCT_THREAD,                  op_get_children,                      CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_REPLY,                               op_reply,                             CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_RESEND,                              op_resend,                            CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_SAVE,                                op_save,                              CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_SEARCH,                              op_search,                            CHECK_IN_MAILBOX },
  { OP_SEARCH_NEXT,                         op_search,                            CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_SEARCH_OPPOSITE,                     op_search,                            CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_SEARCH_REVERSE,                      op_search,                            CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_SORT,                                op_sort,                              CHECK_NO_FLAGS },
  { OP_SORT_REVERSE,                        op_sort,                              CHECK_NO_FLAGS },
  { OP_TAG,                                 op_tag,                               CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_TAG_SUBTHREAD,                       op_tag_thread,                        CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_TAG_THREAD,                          op_tag_thread,                        CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_TOGGLE_NEW,                          op_toggle_new,                        CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_TOGGLE_READ,                         op_main_limit,                        CHECK_IN_MAILBOX },
  { OP_TOGGLE_WRITE,                        op_toggle_write,                      CHECK_IN_MAILBOX },
  { OP_UNDELETE,                            op_undelete,                          CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_UNDELETE_SUBTHREAD,                  op_undelete_thread,                   CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_UNDELETE_THREAD,                     op_undelete_thread,                   CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_READONLY | CHECK_VISIBLE },
  { OP_VIEW_ATTACHMENTS,                    op_view_attachments,                  CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_VIEW_RAW_MESSAGE,                    op_edit_raw_message,                  CHECK_ATTACH | CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
#ifdef USE_AUTOCRYPT
  { OP_AUTOCRYPT_ACCT_MENU,                 op_autocrypt_acct_menu,               CHECK_NO_FLAGS },
#endif
#ifdef USE_NOTMUCH
  { OP_MAIN_CHANGE_VFOLDER,                 op_main_change_folder,                CHECK_NO_FLAGS },
  { OP_MAIN_ENTIRE_THREAD,                  op_main_entire_thread,                CHECK_IN_MAILBOX | CHECK_MSGCOUNT | CHECK_VISIBLE },
  { OP_MAIN_VFOLDER_FROM_QUERY,             op_main_vfolder_from_query,           CHECK_NO_FLAGS },
  { OP_MAIN_VFOLDER_FROM_QUERY_READONLY,    op_main_vfolder_from_query,           CHECK_NO_FLAGS },
  { OP_MAIN_WINDOWED_VFOLDER_BACKWARD,      op_main_windowed_vfolder,             CHECK_IN_MAILBOX },
  { OP_MAIN_WINDOWED_VFOLDER_FORWARD,       op_main_windowed_vfolder,             CHECK_IN_MAILBOX },
  { OP_MAIN_WINDOWED_VFOLDER_RESET,         op_main_windowed_vfolder,             CHECK_IN_MAILBOX },
#endif
  { 0, NULL, CHECK_NO_FLAGS },
  // clang-format on
};
 
int index_function_dispatcher(struct MuttWindow *win, int op)
{
  // The Dispatcher may be called on any Window in the Dialog
  struct MuttWindow *dlg = dialog_find(win);
  if (!dlg || !dlg->wdata || !win->parent || !win->parent->wdata)
    return FR_ERROR;
 
  struct IndexPrivateData *priv = win->parent->wdata;
  struct IndexSharedData *shared = dlg->wdata;
 
  int rc = FR_UNKNOWN;
  for (size_t i = 0; IndexFunctions[i].op != OP_NULL; i++)
  {
    const struct IndexFunction *fn = &IndexFunctions[i];
    if (fn->op == op)
    {
      if (!prereq(shared, priv->menu, fn->flags))
      {
        rc = FR_ERROR;
        break;
      }
      rc = fn->function(shared, priv, op);
      break;
    }
  }
 
  if (rc == FR_UNKNOWN) // Not our function
    return rc;
 
  const char *result = dispatcher_get_retval_name(rc);
  mutt_debug(LL_DEBUG1, "Handled %s (%d) -> %s\n", opcodes_get_name(op), op, NONULL(result));
 
  return rc;
}