notmuch.c

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#include "config.h"
#include <errno.h>
#include <limits.h>
#include <notmuch.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "private.h"
#include "mutt/lib.h"
#include "config/lib.h"
#include "email/lib.h"
#include "core/lib.h"
#include "mutt.h"
#include "lib.h"
#include "editor/lib.h"
#include "hcache/lib.h"
#include "history/lib.h"
#include "index/lib.h"
#include "progress/lib.h"
#include "adata.h"
#include "commands.h"
#include "edata.h"
#include "maildir/shared.h"
#include "mdata.h"
#include "mutt_thread.h"
#include "mx.h"
#include "protos.h"
#include "query.h"
#include "tag.h"
#ifdef ENABLE_NLS
#include <libintl.h>
#endif
 
struct stat;
 
static const struct Command NmCommands[] = {
  // clang-format off
  { "unvirtual-mailboxes", parse_unmailboxes, 0 },
  { "virtual-mailboxes",   parse_mailboxes,   MUTT_NAMED },
  // clang-format on
};
 
const char NmUrlProtocol[] = "notmuch://";
const int NmUrlProtocolLen = sizeof(NmUrlProtocol) - 1;
 
void nm_init(void)
{
  commands_register(NmCommands, mutt_array_size(NmCommands));
}
 
static struct HeaderCache *nm_hcache_open(struct Mailbox *m)
{
#ifdef USE_HCACHE
  const char *const c_header_cache = cs_subset_path(NeoMutt->sub, "header_cache");
  return hcache_open(c_header_cache, mailbox_path(m), NULL);
#else
  return NULL;
#endif
}
 
static void nm_hcache_close(struct HeaderCache **ptr)
{
#ifdef USE_HCACHE
  hcache_close(ptr);
#endif
}
 
static char *nm_get_default_url(void)
{
  // path to DB + query + url "decoration"
  size_t len = PATH_MAX + 1024 + 32;
  char *url = mutt_mem_malloc(len);
 
  // Try to use `$nm_default_url` or `$folder`.
  // If neither are set, it is impossible to create a Notmuch URL.
  const char *const c_nm_default_url = cs_subset_string(NeoMutt->sub, "nm_default_url");
  const char *const c_folder = cs_subset_string(NeoMutt->sub, "folder");
  if (c_nm_default_url)
  {
    snprintf(url, len, "%s", c_nm_default_url);
  }
  else if (c_folder)
  {
    snprintf(url, len, "notmuch://%s", c_folder);
  }
  else
  {
    FREE(&url);
    return NULL;
  }
 
  return url;
}
 
static struct NmMboxData *nm_get_default_data(void)
{
  // path to DB + query + url "decoration"
  char *url = nm_get_default_url();
  if (!url)
    return NULL;
 
  struct NmMboxData *default_data = nm_mdata_new(url);
  FREE(&url);
 
  return default_data;
}
 
static int init_mailbox(struct Mailbox *m)
{
  if (!m || (m->type != MUTT_NOTMUCH))
    return -1;
 
  if (m->mdata)
    return 0;
 
  m->mdata = nm_mdata_new(mailbox_path(m));
  if (!m->mdata)
    return -1;
 
  m->mdata_free = nm_mdata_free;
  return 0;
}
 
static char *email_get_id(struct Email *e)
{
  struct NmEmailData *edata = nm_edata_get(e);
  if (!edata)
    return NULL;
 
  return edata->virtual_id;
}
 
static char *email_get_fullpath(struct Email *e, char *buf, size_t buflen)
{
  snprintf(buf, buflen, "%s/%s", nm_email_get_folder(e), e->path);
  return buf;
}
 
static void query_window_reset(void)
{
  mutt_debug(LL_DEBUG2, "entering\n");
  cs_subset_str_native_set(NeoMutt->sub, "nm_query_window_current_position", 0, NULL);
}
 
static bool windowed_query_from_query(const char *query, char *buf, size_t buflen)
{
  mutt_debug(LL_DEBUG2, "nm: %s\n", query);
 
  const bool c_nm_query_window_enable = cs_subset_bool(NeoMutt->sub, "nm_query_window_enable");
  const short c_nm_query_window_duration = cs_subset_number(NeoMutt->sub, "nm_query_window_duration");
  const short c_nm_query_window_current_position = cs_subset_number(NeoMutt->sub, "nm_query_window_current_position");
  const char *const c_nm_query_window_current_search = cs_subset_string(NeoMutt->sub, "nm_query_window_current_search");
  const char *const c_nm_query_window_timebase = cs_subset_string(NeoMutt->sub, "nm_query_window_timebase");
  const char *const c_nm_query_window_or_terms = cs_subset_string(NeoMutt->sub, "nm_query_window_or_terms");
 
  /* if the query has changed, reset the window position */
  if (!c_nm_query_window_current_search || !mutt_str_equal(query, c_nm_query_window_current_search))
  {
    query_window_reset();
  }
 
  enum NmWindowQueryRc rc = nm_windowed_query_from_query(
      buf, buflen, c_nm_query_window_enable, c_nm_query_window_duration,
      c_nm_query_window_current_position, c_nm_query_window_current_search,
      c_nm_query_window_timebase, c_nm_query_window_or_terms);
 
  switch (rc)
  {
    case NM_WINDOW_QUERY_SUCCESS:
    {
      mutt_debug(LL_DEBUG2, "nm: %s -> %s\n", query, buf);
      break;
    }
    case NM_WINDOW_QUERY_INVALID_DURATION:
    {
      query_window_reset();
      return false;
    }
    case NM_WINDOW_QUERY_INVALID_TIMEBASE:
    {
      mutt_message(
          // L10N: The values 'hour', 'day', 'week', 'month', 'year' are literal.
          //       They should not be translated.
          _("Invalid nm_query_window_timebase value (valid values are: hour, day, week, month, year)"));
      mutt_debug(LL_DEBUG2, "Invalid nm_query_window_timebase value\n");
      return false;
    }
  }
 
  return true;
}
 
static char *get_query_string(struct NmMboxData *mdata, bool window)
{
  mutt_debug(LL_DEBUG2, "nm: %s\n", window ? "true" : "false");
 
  if (!mdata)
    return NULL;
  if (mdata->db_query && !window)
    return mdata->db_query;
 
  const char *const c_nm_query_type = cs_subset_string(NeoMutt->sub, "nm_query_type");
  mdata->query_type = nm_string_to_query_type(c_nm_query_type); /* user's default */
 
  struct UrlQuery *item = NULL;
  STAILQ_FOREACH(item, &mdata->db_url->query_strings, entries)
  {
    if (!item->value || !item->name)
      continue;
 
    if (mutt_str_equal(item->name, "limit"))
    {
      if (!mutt_str_atoi_full(item->value, &mdata->db_limit))
      {
        mutt_error(_("failed to parse notmuch limit: %s"), item->value);
      }
    }
    else if (mutt_str_equal(item->name, "type"))
    {
      mdata->query_type = nm_string_to_query_type(item->value);
    }
    else if (mutt_str_equal(item->name, "query"))
    {
      mutt_str_replace(&mdata->db_query, item->value);
    }
  }
 
  if (!mdata->db_query)
    return NULL;
 
  if (window)
  {
    char buf[1024] = { 0 };
    cs_subset_str_string_set(NeoMutt->sub, "nm_query_window_current_search",
                             mdata->db_query, NULL);
 
    /* if a date part is defined, do not apply windows (to avoid the risk of
     * having a non-intersected date frame). A good improvement would be to
     * accept if they intersect */
    if (!strstr(mdata->db_query, "date:") &&
        windowed_query_from_query(mdata->db_query, buf, sizeof(buf)))
    {
      mutt_str_replace(&mdata->db_query, buf);
    }
 
    mutt_debug(LL_DEBUG2, "nm: query (windowed) '%s'\n", mdata->db_query);
  }
  else
  {
    mutt_debug(LL_DEBUG2, "nm: query '%s'\n", mdata->db_query);
  }
 
  return mdata->db_query;
}
 
static int get_limit(struct NmMboxData *mdata)
{
  return mdata ? mdata->db_limit : 0;
}
 
static void apply_exclude_tags(notmuch_query_t *query)
{
  const char *const c_nm_exclude_tags = cs_subset_string(NeoMutt->sub, "nm_exclude_tags");
  if (!c_nm_exclude_tags || !query)
    return;
 
  struct NmTags tags = nm_tag_str_to_tags(c_nm_exclude_tags);
 
  char **tag = NULL;
  ARRAY_FOREACH(tag, &tags.tags)
  {
    mutt_debug(LL_DEBUG2, "nm: query exclude tag '%s'\n", *tag);
    notmuch_query_add_tag_exclude(query, *tag);
  }
 
  notmuch_query_set_omit_excluded(query, 1);
  nm_tag_array_free(&tags);
}
 
static notmuch_query_t *get_query(struct Mailbox *m, bool writable)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return NULL;
 
  notmuch_database_t *db = nm_db_get(m, writable);
  const char *str = get_query_string(mdata, true);
 
  if (!db || !str)
    goto err;
 
  notmuch_query_t *q = notmuch_query_create(db, str);
  if (!q)
    goto err;
 
  apply_exclude_tags(q);
  notmuch_query_set_sort(q, NOTMUCH_SORT_NEWEST_FIRST);
  mutt_debug(LL_DEBUG2, "nm: query successfully initialized (%s)\n", str);
  return q;
err:
  nm_db_release(m);
  return NULL;
}
 
static int update_email_tags(struct Email *e, notmuch_message_t *msg)
{
  struct NmEmailData *edata = nm_edata_get(e);
  struct Buffer *new_tags = buf_pool_get();
  struct Buffer *old_tags = buf_pool_get();
 
  mutt_debug(LL_DEBUG2, "nm: tags update requested (%s)\n", edata->virtual_id);
 
  for (notmuch_tags_t *tags = notmuch_message_get_tags(msg);
       tags && notmuch_tags_valid(tags); notmuch_tags_move_to_next(tags))
  {
    const char *t = notmuch_tags_get(tags);
    if (!t || (*t == '\0'))
      continue;
 
    buf_join_str(new_tags, t, ' ');
  }
 
  driver_tags_get(&e->tags, old_tags);
 
  if (!buf_is_empty(new_tags) && !buf_is_empty(old_tags) &&
      (buf_str_equal(old_tags, new_tags)))
  {
    buf_pool_release(&new_tags);
    buf_pool_release(&old_tags);
    mutt_debug(LL_DEBUG2, "nm: tags unchanged\n");
    return 1;
  }
  buf_pool_release(&old_tags);
 
  /* new version */
  driver_tags_replace(&e->tags, buf_string(new_tags));
  buf_reset(new_tags);
 
  driver_tags_get_transformed(&e->tags, new_tags);
  mutt_debug(LL_DEBUG2, "nm: new tags transformed: '%s'\n", buf_string(new_tags));
  buf_reset(new_tags);
 
  driver_tags_get(&e->tags, new_tags);
  mutt_debug(LL_DEBUG2, "nm: new tag: '%s'\n", buf_string(new_tags));
  buf_pool_release(&new_tags);
 
  return 0;
}
 
static int update_message_path(struct Email *e, const char *path)
{
  struct NmEmailData *edata = nm_edata_get(e);
 
  mutt_debug(LL_DEBUG2, "nm: path update requested path=%s, (%s)\n", path, edata->virtual_id);
 
  char *p = strrchr(path, '/');
  if (p && ((p - path) > 3) &&
      (mutt_strn_equal(p - 3, "cur", 3) || mutt_strn_equal(p - 3, "new", 3) ||
       mutt_strn_equal(p - 3, "tmp", 3)))
  {
    edata->type = MUTT_MAILDIR;
 
    FREE(&e->path);
    FREE(&edata->folder);
 
    p -= 3; /* skip subfolder (e.g. "new") */
    if (cs_subset_bool(NeoMutt->sub, "mark_old"))
    {
      e->old = mutt_str_startswith(p, "cur");
    }
    e->path = mutt_str_dup(p);
 
    for (; (p > path) && (*(p - 1) == '/'); p--)
      ; // do nothing
 
    edata->folder = mutt_strn_dup(path, p - path);
 
    mutt_debug(LL_DEBUG2, "nm: folder='%s', file='%s'\n", edata->folder, e->path);
    return 0;
  }
 
  return 1;
}
 
static char *get_folder_from_path(const char *path)
{
  char *p = strrchr(path, '/');
 
  if (p && ((p - path) > 3) &&
      (mutt_strn_equal(p - 3, "cur", 3) || mutt_strn_equal(p - 3, "new", 3) ||
       mutt_strn_equal(p - 3, "tmp", 3)))
  {
    p -= 3;
    for (; (p > path) && (*(p - 1) == '/'); p--)
      ; // do nothing
 
    return mutt_strn_dup(path, p - path);
  }
 
  return NULL;
}
 
static char *nm2mutt_message_id(const char *id)
{
  if (!id)
    return NULL;
 
  char *mid = NULL;
  mutt_str_asprintf(&mid, "<%s>", id);
  return mid;
}
 
static int init_email(struct Email *e, const char *path, notmuch_message_t *msg)
{
  if (nm_edata_get(e))
    return 0;
 
  struct NmEmailData *edata = nm_edata_new();
  e->nm_edata = edata;
 
  /* Notmuch ensures that message Id exists (if not notmuch Notmuch will
   * generate an ID), so it's more safe than use neomutt Email->env->id */
  const char *id = notmuch_message_get_message_id(msg);
  edata->virtual_id = mutt_str_dup(id);
 
  mutt_debug(LL_DEBUG2, "nm: [e=%p, edata=%p] (%s)\n", (void *) e, (void *) edata, id);
 
  char *nm_msg_id = nm2mutt_message_id(id);
  if (!e->env->message_id)
  {
    e->env->message_id = nm_msg_id;
  }
  else if (!mutt_str_equal(e->env->message_id, nm_msg_id))
  {
    FREE(&e->env->message_id);
    e->env->message_id = nm_msg_id;
  }
  else
  {
    FREE(&nm_msg_id);
  }
 
  if (update_message_path(e, path) != 0)
    return -1;
 
  update_email_tags(e, msg);
 
  return 0;
}
 
static const char *get_message_last_filename(notmuch_message_t *msg)
{
  const char *name = NULL;
 
  for (notmuch_filenames_t *ls = notmuch_message_get_filenames(msg);
       ls && notmuch_filenames_valid(ls); notmuch_filenames_move_to_next(ls))
  {
    name = notmuch_filenames_get(ls);
  }
 
  return name;
}
 
static void progress_setup(struct Mailbox *m)
{
  if (!m->verbose)
    return;
 
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return;
 
  mdata->oldmsgcount = m->msg_count;
  mdata->ignmsgcount = 0;
  mdata->progress = progress_new(MUTT_PROGRESS_READ, mdata->oldmsgcount);
  progress_set_message(mdata->progress, _("Reading messages..."));
}
 
static void nm_progress_update(struct Mailbox *m)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
 
  if (!m->verbose || !mdata || !mdata->progress)
    return;
 
  progress_update(mdata->progress, m->msg_count + mdata->ignmsgcount, -1);
}
 
static struct Email *get_mutt_email(struct Mailbox *m, notmuch_message_t *msg)
{
  if (!m || !msg)
    return NULL;
 
  const char *id = notmuch_message_get_message_id(msg);
  if (!id)
    return NULL;
 
  mutt_debug(LL_DEBUG2, "nm: neomutt email, id='%s'\n", id);
 
  if (!m->id_hash)
  {
    mutt_debug(LL_DEBUG2, "nm: init hash\n");
    m->id_hash = mutt_make_id_hash(m);
    if (!m->id_hash)
      return NULL;
  }
 
  char *mid = nm2mutt_message_id(id);
  mutt_debug(LL_DEBUG2, "nm: neomutt id='%s'\n", mid);
 
  struct Email *e = mutt_hash_find(m->id_hash, mid);
  FREE(&mid);
  return e;
}
 
static void append_message(struct HeaderCache *hc, struct Mailbox *m,
                           notmuch_message_t *msg, bool dedup)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return;
 
  char *newpath = NULL;
  struct Email *e = NULL;
 
  /* deduplicate */
  if (dedup && get_mutt_email(m, msg))
  {
    mdata->ignmsgcount++;
    nm_progress_update(m);
    mutt_debug(LL_DEBUG2, "nm: ignore id=%s, already in the m\n",
               notmuch_message_get_message_id(msg));
    return;
  }
 
  const char *path = get_message_last_filename(msg);
  if (!path)
    return;
 
  mutt_debug(LL_DEBUG2, "nm: appending message, i=%d, id=%s, path=%s\n",
             m->msg_count, notmuch_message_get_message_id(msg), path);
 
  mx_alloc_memory(m, m->msg_count);
 
#ifdef USE_HCACHE
  e = hcache_fetch_email(hc, path, mutt_str_len(path), 0).email;
  if (!e)
#endif
  {
    if (access(path, F_OK) == 0)
    {
      /* We pass is_old=false as argument here, but e->old will be updated later
       * by update_message_path() (called by init_email() below).  */
      e = maildir_email_new();
      if (!maildir_parse_message(path, false, e))
        email_free(&e);
    }
    else
    {
      /* maybe moved try find it... */
      char *folder = get_folder_from_path(path);
 
      if (folder)
      {
        FILE *fp = maildir_open_find_message(folder, path, &newpath);
        if (fp)
        {
          e = maildir_email_new();
          if (!maildir_parse_stream(fp, newpath, false, e))
            email_free(&e);
          mutt_file_fclose(&fp);
 
          mutt_debug(LL_DEBUG1, "nm: not up-to-date: %s -> %s\n", path, newpath);
        }
      }
      FREE(&folder);
    }
 
    if (!e)
    {
      mutt_debug(LL_DEBUG1, "nm: failed to parse message: %s\n", path);
      goto done;
    }
 
#ifdef USE_HCACHE
    hcache_store_email(hc, newpath ? newpath : path,
                       mutt_str_len(newpath ? newpath : path), e, 0);
#endif
  }
 
  if (init_email(e, newpath ? newpath : path, msg) != 0)
  {
    email_free(&e);
    mutt_debug(LL_DEBUG1, "nm: failed to append email!\n");
    goto done;
  }
 
  e->active = true;
  e->index = m->msg_count;
  mailbox_size_add(m, e);
  m->emails[m->msg_count] = e;
  m->msg_count++;
 
  if (newpath)
  {
    /* remember that file has been moved -- nm_mbox_sync() will update the DB */
    struct NmEmailData *edata = nm_edata_get(e);
    if (edata)
    {
      mutt_debug(LL_DEBUG1, "nm: remember obsolete path: %s\n", path);
      edata->oldpath = mutt_str_dup(path);
    }
  }
  nm_progress_update(m);
done:
  FREE(&newpath);
}
 
static void append_replies(struct HeaderCache *hc, struct Mailbox *m,
                           notmuch_query_t *q, notmuch_message_t *top, bool dedup)
{
  notmuch_messages_t *msgs = NULL;
 
  for (msgs = notmuch_message_get_replies(top); notmuch_messages_valid(msgs);
       notmuch_messages_move_to_next(msgs))
  {
    notmuch_message_t *nm = notmuch_messages_get(msgs);
    append_message(hc, m, nm, dedup);
    /* recurse through all the replies to this message too */
    append_replies(hc, m, q, nm, dedup);
    notmuch_message_destroy(nm);
  }
}
 
static void append_thread(struct HeaderCache *hc, struct Mailbox *m,
                          notmuch_query_t *q, notmuch_thread_t *thread, bool dedup)
{
  notmuch_messages_t *msgs = NULL;
 
  for (msgs = notmuch_thread_get_toplevel_messages(thread);
       notmuch_messages_valid(msgs); notmuch_messages_move_to_next(msgs))
  {
    notmuch_message_t *nm = notmuch_messages_get(msgs);
    append_message(hc, m, nm, dedup);
    append_replies(hc, m, q, nm, dedup);
    notmuch_message_destroy(nm);
  }
}
 
static notmuch_messages_t *get_messages(notmuch_query_t *query)
{
  if (!query)
    return NULL;
 
  notmuch_messages_t *msgs = NULL;
 
#if LIBNOTMUCH_CHECK_VERSION(5, 0, 0)
  if (notmuch_query_search_messages(query, &msgs) != NOTMUCH_STATUS_SUCCESS)
    return NULL;
#elif LIBNOTMUCH_CHECK_VERSION(4, 3, 0)
  if (notmuch_query_search_messages_st(query, &msgs) != NOTMUCH_STATUS_SUCCESS)
    return NULL;
#else
  msgs = notmuch_query_search_messages(query);
#endif
 
  return msgs;
}
 
static bool read_mesgs_query(struct Mailbox *m, notmuch_query_t *q, bool dedup)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return false;
 
  int limit = get_limit(mdata);
 
  notmuch_messages_t *msgs = get_messages(q);
 
  if (!msgs)
    return false;
 
  struct HeaderCache *hc = nm_hcache_open(m);
 
  for (; notmuch_messages_valid(msgs) && ((limit == 0) || (m->msg_count < limit));
       notmuch_messages_move_to_next(msgs))
  {
    if (SigInt)
    {
      nm_hcache_close(&hc);
      SigInt = false;
      return false;
    }
    notmuch_message_t *nm = notmuch_messages_get(msgs);
    append_message(hc, m, nm, dedup);
    notmuch_message_destroy(nm);
  }
 
  nm_hcache_close(&hc);
  return true;
}
 
static notmuch_threads_t *get_threads(notmuch_query_t *query)
{
  if (!query)
    return NULL;
 
  notmuch_threads_t *threads = NULL;
#if LIBNOTMUCH_CHECK_VERSION(5, 0, 0)
  if (notmuch_query_search_threads(query, &threads) != NOTMUCH_STATUS_SUCCESS)
    return false;
#elif LIBNOTMUCH_CHECK_VERSION(4, 3, 0)
  if (notmuch_query_search_threads_st(query, &threads) != NOTMUCH_STATUS_SUCCESS)
    return false;
#else
  threads = notmuch_query_search_threads(query);
#endif
 
  return threads;
}
 
static bool read_threads_query(struct Mailbox *m, notmuch_query_t *q, bool dedup, int limit)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return false;
 
  notmuch_threads_t *threads = get_threads(q);
  if (!threads)
    return false;
 
  struct HeaderCache *hc = nm_hcache_open(m);
 
  for (; notmuch_threads_valid(threads) && ((limit == 0) || (m->msg_count < limit));
       notmuch_threads_move_to_next(threads))
  {
    if (SigInt)
    {
      nm_hcache_close(&hc);
      SigInt = false;
      return false;
    }
    notmuch_thread_t *thread = notmuch_threads_get(threads);
    append_thread(hc, m, q, thread, dedup);
    notmuch_thread_destroy(thread);
  }
 
  nm_hcache_close(&hc);
  return true;
}
 
static notmuch_message_t *get_nm_message(notmuch_database_t *db, struct Email *e)
{
  notmuch_message_t *msg = NULL;
  char *id = email_get_id(e);
 
  mutt_debug(LL_DEBUG2, "nm: find message (%s)\n", id);
 
  if (id && db)
    notmuch_database_find_message(db, id, &msg);
 
  return msg;
}
 
static bool nm_message_has_tag(notmuch_message_t *msg, char *tag)
{
  const char *possible_match_tag = NULL;
  notmuch_tags_t *tags = NULL;
 
  for (tags = notmuch_message_get_tags(msg); notmuch_tags_valid(tags);
       notmuch_tags_move_to_next(tags))
  {
    possible_match_tag = notmuch_tags_get(tags);
    if (mutt_str_equal(possible_match_tag, tag))
    {
      return true;
    }
  }
  return false;
}
 
static void sync_email_path_with_nm(struct Email *e, notmuch_message_t *msg)
{
  const char *new_file = get_message_last_filename(msg);
  char old_file[PATH_MAX] = { 0 };
  email_get_fullpath(e, old_file, sizeof(old_file));
 
  if (!mutt_str_equal(old_file, new_file))
    update_message_path(e, new_file);
}
 
static int update_tags(notmuch_message_t *msg, const char *tag_str)
{
  if (!tag_str)
    return -1;
 
  notmuch_message_freeze(msg);
 
  struct NmTags tags = nm_tag_str_to_tags(tag_str);
  char **tag_elem = NULL;
  ARRAY_FOREACH(tag_elem, &tags.tags)
  {
    char *tag = *tag_elem;
 
    if (tag[0] == '-')
    {
      mutt_debug(LL_DEBUG1, "nm: remove tag: '%s'\n", tag + 1);
      notmuch_message_remove_tag(msg, tag + 1);
    }
    else if (tag[0] == '!')
    {
      mutt_debug(LL_DEBUG1, "nm: toggle tag: '%s'\n", tag + 1);
      if (nm_message_has_tag(msg, tag + 1))
      {
        notmuch_message_remove_tag(msg, tag + 1);
      }
      else
      {
        notmuch_message_add_tag(msg, tag + 1);
      }
    }
    else
    {
      mutt_debug(LL_DEBUG1, "nm: add tag: '%s'\n", (tag[0] == '+') ? tag + 1 : tag);
      notmuch_message_add_tag(msg, (tag[0] == '+') ? tag + 1 : tag);
    }
  }
 
  notmuch_message_thaw(msg);
  nm_tag_array_free(&tags);
 
  return 0;
}
 
static int update_email_flags(struct Mailbox *m, struct Email *e, const char *tag_str)
{
  if (!tag_str)
    return -1;
 
  const char *const c_nm_unread_tag = cs_subset_string(NeoMutt->sub, "nm_unread_tag");
  const char *const c_nm_replied_tag = cs_subset_string(NeoMutt->sub, "nm_replied_tag");
  const char *const c_nm_flagged_tag = cs_subset_string(NeoMutt->sub, "nm_flagged_tag");
 
  struct NmTags tags = nm_tag_str_to_tags(tag_str);
  char **tag_elem = NULL;
  ARRAY_FOREACH(tag_elem, &tags.tags)
  {
    char *tag = *tag_elem;
 
    if (tag[0] == '-')
    {
      tag++;
      if (mutt_str_equal(tag, c_nm_unread_tag))
        mutt_set_flag(m, e, MUTT_READ, true, true);
      else if (mutt_str_equal(tag, c_nm_replied_tag))
        mutt_set_flag(m, e, MUTT_REPLIED, false, true);
      else if (mutt_str_equal(tag, c_nm_flagged_tag))
        mutt_set_flag(m, e, MUTT_FLAG, false, true);
    }
    else
    {
      tag = (tag[0] == '+') ? tag + 1 : tag;
      if (mutt_str_equal(tag, c_nm_unread_tag))
        mutt_set_flag(m, e, MUTT_READ, false, true);
      else if (mutt_str_equal(tag, c_nm_replied_tag))
        mutt_set_flag(m, e, MUTT_REPLIED, true, true);
      else if (mutt_str_equal(tag, c_nm_flagged_tag))
        mutt_set_flag(m, e, MUTT_FLAG, true, true);
    }
  }
 
  nm_tag_array_free(&tags);
 
  return 0;
}
 
static int rename_maildir_filename(const char *old, char *buf, size_t buflen, struct Email *e)
{
  char filename[PATH_MAX] = { 0 };
  char suffix[PATH_MAX] = { 0 };
  char folder[PATH_MAX] = { 0 };
 
  mutt_str_copy(folder, old, sizeof(folder));
  char *p = strrchr(folder, '/');
  if (p)
  {
    *p = '\0';
    p++;
  }
  else
  {
    p = folder;
  }
 
  mutt_str_copy(filename, p, sizeof(filename));
 
  /* remove (new,cur,...) from folder path */
  p = strrchr(folder, '/');
  if (p)
    *p = '\0';
 
  /* remove old flags from filename */
  const char c_maildir_field_delimiter = *cc_maildir_field_delimiter();
  p = strchr(filename, c_maildir_field_delimiter);
  if (p)
    *p = '\0';
 
  /* compose new flags */
  maildir_gen_flags(suffix, sizeof(suffix), e);
 
  snprintf(buf, buflen, "%s/%s/%s%s", folder,
           (e->read || e->old) ? "cur" : "new", filename, suffix);
 
  if (mutt_str_equal(old, buf))
    return 1;
 
  if (rename(old, buf) != 0)
  {
    mutt_debug(LL_DEBUG1, "nm: rename(2) failed %s -> %s\n", old, buf);
    return -1;
  }
 
  return 0;
}
 
static int remove_filename(struct Mailbox *m, const char *path)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return -1;
 
  mutt_debug(LL_DEBUG2, "nm: remove filename '%s'\n", path);
 
  notmuch_database_t *db = nm_db_get(m, true);
  if (!db)
    return -1;
 
  notmuch_message_t *msg = NULL;
  notmuch_status_t st = notmuch_database_find_message_by_filename(db, path, &msg);
  if (st || !msg)
    return -1;
 
  int trans = nm_db_trans_begin(m);
  if (trans < 0)
    return -1;
 
  /* note that unlink() is probably unnecessary here, it's already removed
   * by mh_sync_mailbox_message(), but for sure...  */
  notmuch_filenames_t *ls = NULL;
  st = notmuch_database_remove_message(db, path);
  switch (st)
  {
    case NOTMUCH_STATUS_SUCCESS:
      mutt_debug(LL_DEBUG2, "nm: remove success, call unlink\n");
      unlink(path);
      break;
    case NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID:
      mutt_debug(LL_DEBUG2, "nm: remove success (duplicate), call unlink\n");
      unlink(path);
      for (ls = notmuch_message_get_filenames(msg);
           ls && notmuch_filenames_valid(ls); notmuch_filenames_move_to_next(ls))
      {
        path = notmuch_filenames_get(ls);
 
        mutt_debug(LL_DEBUG2, "nm: remove duplicate: '%s'\n", path);
        unlink(path);
        notmuch_database_remove_message(db, path);
      }
      break;
    default:
      mutt_debug(LL_DEBUG1, "nm: failed to remove '%s' [st=%d]\n", path, (int) st);
      break;
  }
 
  notmuch_message_destroy(msg);
  if (trans)
    nm_db_trans_end(m);
  return 0;
}
 
static int rename_filename(struct Mailbox *m, const char *old_file,
                           const char *new_file, struct Email *e)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return -1;
 
  notmuch_database_t *db = nm_db_get(m, true);
  if (!db || !new_file || !old_file || (access(new_file, F_OK) != 0))
    return -1;
 
  int rc = -1;
  notmuch_status_t st;
  notmuch_filenames_t *ls = NULL;
  notmuch_message_t *msg = NULL;
 
  mutt_debug(LL_DEBUG1, "nm: rename filename, %s -> %s\n", old_file, new_file);
  int trans = nm_db_trans_begin(m);
  if (trans < 0)
    return -1;
 
  mutt_debug(LL_DEBUG2, "nm: rename: add '%s'\n", new_file);
#if LIBNOTMUCH_CHECK_VERSION(5, 1, 0)
  st = notmuch_database_index_file(db, new_file, NULL, &msg);
#else
  st = notmuch_database_add_message(db, new_file, &msg);
#endif
 
  if ((st != NOTMUCH_STATUS_SUCCESS) && (st != NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID))
  {
    mutt_debug(LL_DEBUG1, "nm: failed to add '%s' [st=%d]\n", new_file, (int) st);
    goto done;
  }
 
  mutt_debug(LL_DEBUG2, "nm: rename: rem '%s'\n", old_file);
  st = notmuch_database_remove_message(db, old_file);
  switch (st)
  {
    case NOTMUCH_STATUS_SUCCESS:
      break;
    case NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID:
      mutt_debug(LL_DEBUG2, "nm: rename: syncing duplicate filename\n");
      notmuch_message_destroy(msg);
      msg = NULL;
      notmuch_database_find_message_by_filename(db, new_file, &msg);
 
      for (ls = notmuch_message_get_filenames(msg);
           msg && ls && notmuch_filenames_valid(ls); notmuch_filenames_move_to_next(ls))
      {
        const char *path = notmuch_filenames_get(ls);
        char newpath[PATH_MAX] = { 0 };
 
        if (mutt_str_equal(new_file, path))
          continue;
 
        mutt_debug(LL_DEBUG2, "nm: rename: syncing duplicate: %s\n", path);
 
        if (rename_maildir_filename(path, newpath, sizeof(newpath), e) == 0)
        {
          mutt_debug(LL_DEBUG2, "nm: rename dup %s -> %s\n", path, newpath);
          notmuch_database_remove_message(db, path);
#if LIBNOTMUCH_CHECK_VERSION(5, 1, 0)
          notmuch_database_index_file(db, newpath, NULL, NULL);
#else
          notmuch_database_add_message(db, newpath, NULL);
#endif
        }
      }
      notmuch_message_destroy(msg);
      msg = NULL;
      notmuch_database_find_message_by_filename(db, new_file, &msg);
      st = NOTMUCH_STATUS_SUCCESS;
      break;
    default:
      mutt_debug(LL_DEBUG1, "nm: failed to remove '%s' [st=%d]\n", old_file, (int) st);
      break;
  }
 
  if ((st == NOTMUCH_STATUS_SUCCESS) && e && msg)
  {
    notmuch_message_maildir_flags_to_tags(msg);
    update_email_tags(e, msg);
 
    struct Buffer *tags = buf_pool_get();
    driver_tags_get(&e->tags, tags);
    update_tags(msg, buf_string(tags));
    buf_pool_release(&tags);
  }
 
  rc = 0;
done:
  if (msg)
    notmuch_message_destroy(msg);
  if (trans)
    nm_db_trans_end(m);
  return rc;
}
 
static unsigned int count_query(notmuch_database_t *db, const char *qstr, int limit)
{
  notmuch_query_t *q = notmuch_query_create(db, qstr);
  if (!q)
    return 0;
 
  unsigned int res = 0;
 
  apply_exclude_tags(q);
#if LIBNOTMUCH_CHECK_VERSION(5, 0, 0)
  if (notmuch_query_count_messages(q, &res) != NOTMUCH_STATUS_SUCCESS)
    res = 0; /* may not be defined on error */
#elif LIBNOTMUCH_CHECK_VERSION(4, 3, 0)
  if (notmuch_query_count_messages_st(q, &res) != NOTMUCH_STATUS_SUCCESS)
    res = 0; /* may not be defined on error */
#else
  res = notmuch_query_count_messages(q);
#endif
  notmuch_query_destroy(q);
  mutt_debug(LL_DEBUG1, "nm: count '%s', result=%d\n", qstr, res);
 
  if ((limit > 0) && (res > limit))
    res = limit;
 
  return res;
}
 
char *nm_email_get_folder(struct Email *e)
{
  struct NmEmailData *edata = nm_edata_get(e);
  if (!edata)
    return NULL;
 
  return edata->folder;
}
 
char *nm_email_get_folder_rel_db(struct Mailbox *m, struct Email *e)
{
  char *full_folder = nm_email_get_folder(e);
  if (!full_folder)
    return NULL;
 
  const char *db_path = nm_db_get_filename(m);
  if (!db_path)
    return NULL;
 
  size_t prefix = mutt_str_startswith(full_folder, db_path);
 
  char *path = full_folder + prefix;
  if (*path == '/')
    path++;
 
  return path;
}
 
int nm_read_entire_thread(struct Mailbox *m, struct Email *e)
{
  if (!m)
    return -1;
 
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return -1;
 
  notmuch_query_t *q = NULL;
  notmuch_database_t *db = NULL;
  notmuch_message_t *msg = NULL;
  int rc = -1;
 
  if (!(db = nm_db_get(m, false)) || !(msg = get_nm_message(db, e)))
    goto done;
 
  mutt_debug(LL_DEBUG1, "nm: reading entire-thread messages...[current count=%d]\n",
             m->msg_count);
 
  progress_setup(m);
  const char *id = notmuch_message_get_thread_id(msg);
  if (!id)
    goto done;
 
  struct Buffer *qstr = buf_pool_get();
  buf_printf(qstr, "thread:%s", id);
  q = notmuch_query_create(db, buf_string(qstr));
  buf_pool_release(&qstr);
  if (!q)
    goto done;
  apply_exclude_tags(q);
  notmuch_query_set_sort(q, NOTMUCH_SORT_NEWEST_FIRST);
 
  read_threads_query(m, q, true, 0);
  mdata->mtime.tv_sec = mutt_date_now();
  mdata->mtime.tv_nsec = 0;
  rc = 0;
 
  if (m->msg_count > mdata->oldmsgcount)
    mailbox_changed(m, NT_MAILBOX_INVALID);
done:
  if (q)
    notmuch_query_destroy(q);
 
  nm_db_release(m);
 
  if (m->msg_count == mdata->oldmsgcount)
    mutt_message(_("No more messages in the thread"));
 
  mdata->oldmsgcount = 0;
  mutt_debug(LL_DEBUG1, "nm: reading entire-thread messages... done [rc=%d, count=%d]\n",
             rc, m->msg_count);
  progress_free(&mdata->progress);
  return rc;
}
 
char *nm_url_from_query(struct Mailbox *m, char *buf, size_t buflen)
{
  mutt_debug(LL_DEBUG2, "(%s)\n", buf);
  struct NmMboxData *mdata = nm_mdata_get(m);
  char url[PATH_MAX + 1024 + 32]; /* path to DB + query + URL "decoration" */
  int added;
  bool using_default_data = false;
 
  // No existing data. Try to get a default NmMboxData.
  if (!mdata)
  {
    mdata = nm_get_default_data();
 
    // Failed to get default data.
    if (!mdata)
      return NULL;
 
    using_default_data = true;
  }
 
  enum NmQueryType query_type = nm_string_to_query_type(
      cs_subset_string(NeoMutt->sub, "nm_query_type"));
  mdata->query_type = nm_parse_type_from_query(buf, query_type);
 
  const short c_nm_db_limit = cs_subset_number(NeoMutt->sub, "nm_db_limit");
  if (get_limit(mdata) == c_nm_db_limit)
  {
    added = snprintf(url, sizeof(url), "%s%s?type=%s&query=", NmUrlProtocol,
                     nm_db_get_filename(m), nm_query_type_to_string(mdata->query_type));
  }
  else
  {
    added = snprintf(url, sizeof(url), "%s%s?type=%s&limit=%d&query=", NmUrlProtocol,
                     nm_db_get_filename(m),
                     nm_query_type_to_string(mdata->query_type), get_limit(mdata));
  }
 
  if (added >= sizeof(url))
  {
    // snprintf output was truncated, so can't create URL
    return NULL;
  }
 
  url_pct_encode(&url[added], sizeof(url) - added, buf);
 
  mutt_str_copy(buf, url, buflen);
  buf[buflen - 1] = '\0';
 
  if (using_default_data)
    nm_mdata_free((void **) &mdata);
 
  mutt_debug(LL_DEBUG1, "nm: url from query '%s'\n", buf);
  return buf;
}
 
bool nm_query_window_available(void)
{
  const short c_nm_query_window_duration = cs_subset_number(NeoMutt->sub, "nm_query_window_duration");
  const bool c_nm_query_window_enable = cs_subset_bool(NeoMutt->sub, "nm_query_window_enable");
 
  return c_nm_query_window_enable || (c_nm_query_window_duration > 0);
}
 
void nm_query_window_forward(void)
{
  const short c_nm_query_window_current_position = cs_subset_number(NeoMutt->sub, "nm_query_window_current_position");
  if (c_nm_query_window_current_position != 0)
  {
    cs_subset_str_native_set(NeoMutt->sub, "nm_query_window_current_position",
                             c_nm_query_window_current_position - 1, NULL);
  }
 
  mutt_debug(LL_DEBUG2, "(%d)\n", c_nm_query_window_current_position - 1);
}
 
void nm_query_window_backward(void)
{
  const short c_nm_query_window_current_position = cs_subset_number(NeoMutt->sub, "nm_query_window_current_position");
  cs_subset_str_native_set(NeoMutt->sub, "nm_query_window_current_position",
                           c_nm_query_window_current_position + 1, NULL);
  mutt_debug(LL_DEBUG2, "(%d)\n", c_nm_query_window_current_position + 1);
}
 
void nm_query_window_reset(void)
{
  cs_subset_str_native_set(NeoMutt->sub, "nm_query_window_current_position", 0, NULL);
  mutt_debug(LL_DEBUG2, "Reset nm_query_window_current_position to 0\n");
}
 
bool nm_message_is_still_queried(struct Mailbox *m, struct Email *e)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return false;
 
  notmuch_database_t *db = nm_db_get(m, false);
  char *orig_str = get_query_string(mdata, true);
 
  if (!db || !orig_str)
    return false;
 
  char *new_str = NULL;
  bool rc = false;
  if (mutt_str_asprintf(&new_str, "id:%s and (%s)", email_get_id(e), orig_str) < 0)
    return false;
 
  mutt_debug(LL_DEBUG2, "nm: checking if message is still queried: %s\n", new_str);
 
  notmuch_query_t *q = notmuch_query_create(db, new_str);
 
  switch (mdata->query_type)
  {
    case NM_QUERY_TYPE_UNKNOWN: // UNKNOWN should never occur, but MESGS is default
    case NM_QUERY_TYPE_MESGS:
    {
      notmuch_messages_t *messages = get_messages(q);
 
      if (!messages)
        return false;
 
      rc = notmuch_messages_valid(messages);
      notmuch_messages_destroy(messages);
      break;
    }
    case NM_QUERY_TYPE_THREADS:
    {
      notmuch_threads_t *threads = get_threads(q);
 
      if (!threads)
        return false;
 
      rc = notmuch_threads_valid(threads);
      notmuch_threads_destroy(threads);
      break;
    }
  }
 
  notmuch_query_destroy(q);
 
  mutt_debug(LL_DEBUG2, "nm: checking if message is still queried: %s = %s\n",
             new_str, rc ? "true" : "false");
 
  return rc;
}
 
int nm_update_filename(struct Mailbox *m, const char *old_file,
                       const char *new_file, struct Email *e)
{
  char buf[PATH_MAX] = { 0 };
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata || !new_file)
    return -1;
 
  if (!old_file && nm_edata_get(e))
  {
    email_get_fullpath(e, buf, sizeof(buf));
    old_file = buf;
  }
 
  int rc = rename_filename(m, old_file, new_file, e);
 
  nm_db_release(m);
  mdata->mtime.tv_sec = mutt_date_now();
  mdata->mtime.tv_nsec = 0;
  return rc;
}
 
static enum MxStatus nm_mbox_check_stats(struct Mailbox *m, uint8_t flags)
{
  struct UrlQuery *item = NULL;
  struct Url *url = NULL;
  const char *db_filename = NULL;
  char *db_query = NULL;
  notmuch_database_t *db = NULL;
  enum MxStatus rc = MX_STATUS_ERROR;
  const short c_nm_db_limit = cs_subset_number(NeoMutt->sub, "nm_db_limit");
  int limit = c_nm_db_limit;
  mutt_debug(LL_DEBUG1, "nm: count\n");
 
  url = url_parse(mailbox_path(m));
  if (!url)
  {
    mutt_error(_("failed to parse notmuch url: %s"), mailbox_path(m));
    goto done;
  }
 
  STAILQ_FOREACH(item, &url->query_strings, entries)
  {
    if (item->value && (mutt_str_equal(item->name, "query")))
    {
      db_query = item->value;
    }
    else if (item->value && (mutt_str_equal(item->name, "limit")))
    {
      // Try to parse the limit
      if (!mutt_str_atoi_full(item->value, &limit))
      {
        mutt_error(_("failed to parse limit: %s"), item->value);
        goto done;
      }
    }
  }
 
  if (!db_query)
    goto done;
 
  db_filename = url->path;
  if (!db_filename)
    db_filename = nm_db_get_filename(m);
 
  /* don't be verbose about connection, as we're called from
   * sidebar/mailbox very often */
  db = nm_db_do_open(db_filename, false, false);
  if (!db)
    goto done;
 
  /* all emails */
  m->msg_count = count_query(db, db_query, limit);
  mx_alloc_memory(m, m->msg_count);
 
  // holder variable for extending query to unread/flagged
  char *qstr = NULL;
 
  // unread messages
  const char *const c_nm_unread_tag = cs_subset_string(NeoMutt->sub, "nm_unread_tag");
  mutt_str_asprintf(&qstr, "( %s ) tag:%s", db_query, c_nm_unread_tag);
  m->msg_unread = count_query(db, qstr, limit);
  FREE(&qstr);
 
  // flagged messages
  const char *const c_nm_flagged_tag = cs_subset_string(NeoMutt->sub, "nm_flagged_tag");
  mutt_str_asprintf(&qstr, "( %s ) tag:%s", db_query, c_nm_flagged_tag);
  m->msg_flagged = count_query(db, qstr, limit);
  FREE(&qstr);
 
  rc = (m->msg_new > 0) ? MX_STATUS_NEW_MAIL : MX_STATUS_OK;
done:
  if (db)
  {
    nm_db_free(db);
    mutt_debug(LL_DEBUG1, "nm: count close DB\n");
  }
  url_free(&url);
 
  mutt_debug(LL_DEBUG1, "nm: count done [rc=%d]\n", rc);
  return rc;
}
 
static struct Mailbox *get_default_mailbox(void)
{
  // Create a new notmuch mailbox from scratch and add plumbing for DB access.
  char *default_url = nm_get_default_url();
  struct Mailbox *m = mx_path_resolve(default_url);
 
  FREE(&default_url);
 
  // These are no-ops for an initialized mailbox.
  init_mailbox(m);
  mx_mbox_ac_link(m);
 
  return m;
}
 
int nm_record_message(struct Mailbox *m, char *path, struct Email *e)
{
  notmuch_database_t *db = NULL;
  notmuch_status_t st;
  notmuch_message_t *msg = NULL;
  int rc = -1;
 
  struct NmMboxData *mdata = nm_mdata_get(m);
 
  // If no notmuch data, fall back to the default mailbox.
  //
  // IMPORTANT: DO NOT FREE THIS MAILBOX. Two reasons:
  // 1) If user has default mailbox in config, we'll be removing it. That's not
  //    good program behavior!
  // 2) If not in user's config, keep mailbox around for future nm_record calls.
  //    It saves NeoMutt from allocating/deallocating repeatedly.
  if (!mdata)
  {
    mutt_debug(LL_DEBUG1, "nm: non-nm mailbox. trying the default nm mailbox.");
    m = get_default_mailbox();
    mdata = nm_mdata_get(m);
  }
 
  if (!path || !mdata || (access(path, F_OK) != 0))
    return 0;
  db = nm_db_get(m, true);
  if (!db)
    return -1;
 
  mutt_debug(LL_DEBUG1, "nm: record message: %s\n", path);
  int trans = nm_db_trans_begin(m);
  if (trans < 0)
    goto done;
 
#if LIBNOTMUCH_CHECK_VERSION(5, 1, 0)
  st = notmuch_database_index_file(db, path, NULL, &msg);
#else
  st = notmuch_database_add_message(db, path, &msg);
#endif
 
  if ((st != NOTMUCH_STATUS_SUCCESS) && (st != NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID))
  {
    mutt_debug(LL_DEBUG1, "nm: failed to add '%s' [st=%d]\n", path, (int) st);
    goto done;
  }
 
  if ((st == NOTMUCH_STATUS_SUCCESS) && msg)
  {
    notmuch_message_maildir_flags_to_tags(msg);
    if (e)
    {
      struct Buffer *tags = buf_pool_get();
      driver_tags_get(&e->tags, tags);
      update_tags(msg, buf_string(tags));
      buf_pool_release(&tags);
    }
    const char *const c_nm_record_tags = cs_subset_string(NeoMutt->sub, "nm_record_tags");
    if (c_nm_record_tags)
      update_tags(msg, c_nm_record_tags);
  }
 
  rc = 0;
done:
  if (msg)
    notmuch_message_destroy(msg);
  if (trans == 1)
    nm_db_trans_end(m);
 
  nm_db_release(m);
 
  return rc;
}
 
int nm_get_all_tags(struct Mailbox *m, const char **tag_list, int *tag_count)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return -1;
 
  notmuch_database_t *db = NULL;
  notmuch_tags_t *tags = NULL;
  const char *tag = NULL;
  int rc = -1;
 
  if (!(db = nm_db_get(m, false)) || !(tags = notmuch_database_get_all_tags(db)))
    goto done;
 
  *tag_count = 0;
  mutt_debug(LL_DEBUG1, "nm: get all tags\n");
 
  while (notmuch_tags_valid(tags))
  {
    tag = notmuch_tags_get(tags);
    /* Skip empty string */
    if (*tag)
    {
      if (tag_list)
        tag_list[*tag_count] = mutt_str_dup(tag);
      (*tag_count)++;
    }
    notmuch_tags_move_to_next(tags);
  }
 
  rc = 0;
done:
  if (tags)
    notmuch_tags_destroy(tags);
 
  nm_db_release(m);
 
  mutt_debug(LL_DEBUG1, "nm: get all tags done [rc=%d tag_count=%u]\n", rc, *tag_count);
  return rc;
}
 
static bool nm_ac_owns_path(struct Account *a, const char *path)
{
  return true;
}
 
static bool nm_ac_add(struct Account *a, struct Mailbox *m)
{
  if (a->adata)
    return true;
 
  struct NmAccountData *adata = nm_adata_new();
  a->adata = adata;
  a->adata_free = nm_adata_free;
 
  return true;
}
 
static enum MxOpenReturns nm_mbox_open(struct Mailbox *m)
{
  if (init_mailbox(m) != 0)
    return MX_OPEN_ERROR;
 
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return MX_OPEN_ERROR;
 
  mutt_debug(LL_DEBUG1, "nm: reading messages...[current count=%d]\n", m->msg_count);
 
  progress_setup(m);
  enum MxOpenReturns rc = MX_OPEN_ERROR;
 
  notmuch_query_t *q = get_query(m, false);
  if (q)
  {
    rc = MX_OPEN_OK;
    switch (mdata->query_type)
    {
      case NM_QUERY_TYPE_UNKNOWN: // UNKNOWN should never occur, but MESGS is default
      case NM_QUERY_TYPE_MESGS:
        if (!read_mesgs_query(m, q, false))
          rc = MX_OPEN_ABORT;
        break;
      case NM_QUERY_TYPE_THREADS:
        if (!read_threads_query(m, q, false, get_limit(mdata)))
          rc = MX_OPEN_ABORT;
        break;
    }
    notmuch_query_destroy(q);
  }
 
  nm_db_release(m);
 
  mdata->mtime.tv_sec = mutt_date_now();
  mdata->mtime.tv_nsec = 0;
 
  mdata->oldmsgcount = 0;
 
  mutt_debug(LL_DEBUG1, "nm: reading messages... done [rc=%d, count=%d]\n", rc, m->msg_count);
  progress_free(&mdata->progress);
  return rc;
}
 
static enum MxStatus nm_mbox_check(struct Mailbox *m)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  time_t mtime = 0;
  if (!mdata || (nm_db_get_mtime(m, &mtime) != 0))
    return MX_STATUS_ERROR;
 
  int new_flags = 0;
  bool occult = false;
 
  if (mdata->mtime.tv_sec >= mtime)
  {
    mutt_debug(LL_DEBUG2, "nm: check unnecessary (db=%llu mailbox=%llu)\n",
               (unsigned long long) mtime, (unsigned long long) mdata->mtime.tv_sec);
    return MX_STATUS_OK;
  }
 
  mutt_debug(LL_DEBUG1, "nm: checking (db=%llu mailbox=%llu)\n",
             (unsigned long long) mtime, (unsigned long long) mdata->mtime.tv_sec);
 
  notmuch_query_t *q = get_query(m, false);
  if (!q)
    goto done;
 
  mutt_debug(LL_DEBUG1, "nm: start checking (count=%d)\n", m->msg_count);
  mdata->oldmsgcount = m->msg_count;
 
  for (int i = 0; i < m->msg_count; i++)
  {
    struct Email *e = m->emails[i];
    if (!e)
      break;
 
    e->active = false;
  }
 
  int limit = get_limit(mdata);
 
  notmuch_messages_t *msgs = get_messages(q);
 
  // TODO: Analyze impact of removing this version guard.
#if LIBNOTMUCH_CHECK_VERSION(5, 0, 0)
  if (!msgs)
    return MX_STATUS_OK;
#elif LIBNOTMUCH_CHECK_VERSION(4, 3, 0)
  if (!msgs)
    goto done;
#endif
 
  struct HeaderCache *hc = nm_hcache_open(m);
 
  for (int i = 0; notmuch_messages_valid(msgs) && ((limit == 0) || (i < limit));
       notmuch_messages_move_to_next(msgs), i++)
  {
    notmuch_message_t *msg = notmuch_messages_get(msgs);
    struct Email *e = get_mutt_email(m, msg);
 
    if (!e)
    {
      /* new email */
      append_message(hc, m, msg, false);
      notmuch_message_destroy(msg);
      continue;
    }
 
    /* message already exists, merge flags */
    e->active = true;
 
    /* Check to see if the message has moved to a different subdirectory.
     * If so, update the associated filename.  */
    const char *new_file = get_message_last_filename(msg);
    char old_file[PATH_MAX] = { 0 };
    email_get_fullpath(e, old_file, sizeof(old_file));
 
    if (!mutt_str_equal(old_file, new_file))
      update_message_path(e, new_file);
 
    if (!e->changed)
    {
      /* if the user hasn't modified the flags on this message, update the
       * flags we just detected.  */
      struct Email *e_tmp = maildir_email_new();
      maildir_parse_flags(e_tmp, new_file);
      e_tmp->old = e->old;
      maildir_update_flags(m, e, e_tmp);
      email_free(&e_tmp);
    }
 
    if (update_email_tags(e, msg) == 0)
      new_flags++;
 
    notmuch_message_destroy(msg);
  }
 
  nm_hcache_close(&hc);
 
  for (int i = 0; i < m->msg_count; i++)
  {
    struct Email *e = m->emails[i];
    if (!e)
      break;
 
    if (!e->active)
    {
      occult = true;
      break;
    }
  }
 
  if (m->msg_count > mdata->oldmsgcount)
    mailbox_changed(m, NT_MAILBOX_INVALID);
done:
  if (q)
    notmuch_query_destroy(q);
 
  nm_db_release(m);
 
  mdata->mtime.tv_sec = mutt_date_now();
  mdata->mtime.tv_nsec = 0;
 
  mutt_debug(LL_DEBUG1, "nm: ... check done [count=%d, new_flags=%d, occult=%d]\n",
             m->msg_count, new_flags, occult);
 
  if (occult)
    return MX_STATUS_REOPENED;
  if (m->msg_count > mdata->oldmsgcount)
    return MX_STATUS_NEW_MAIL;
  if (new_flags)
    return MX_STATUS_FLAGS;
  return MX_STATUS_OK;
}
 
static enum MxStatus nm_mbox_sync(struct Mailbox *m)
{
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return MX_STATUS_ERROR;
 
  enum MxStatus rc = MX_STATUS_OK;
  struct Progress *progress = NULL;
  char *url = mutt_str_dup(mailbox_path(m));
  bool changed = false;
 
  mutt_debug(LL_DEBUG1, "nm: sync start\n");
 
  if (m->verbose)
  {
    /* all is in this function so we don't use data->progress here */
    progress = progress_new(MUTT_PROGRESS_WRITE, m->msg_count);
    progress_set_message(progress, _("Writing %s..."), mailbox_path(m));
  }
 
  struct HeaderCache *hc = nm_hcache_open(m);
 
  int mh_sync_errors = 0;
  for (int i = 0; i < m->msg_count; i++)
  {
    char old_file[PATH_MAX], new_file[PATH_MAX];
    struct Email *e = m->emails[i];
    if (!e)
      break;
 
    struct NmEmailData *edata = nm_edata_get(e);
 
    progress_update(progress, i, -1);
 
    *old_file = '\0';
    *new_file = '\0';
 
    if (edata->oldpath)
    {
      mutt_str_copy(old_file, edata->oldpath, sizeof(old_file));
      old_file[sizeof(old_file) - 1] = '\0';
      mutt_debug(LL_DEBUG2, "nm: fixing obsolete path '%s'\n", old_file);
    }
    else
    {
      email_get_fullpath(e, old_file, sizeof(old_file));
    }
 
    buf_strcpy(&m->pathbuf, edata->folder);
    m->type = edata->type;
 
    bool ok = maildir_sync_mailbox_message(m, e, hc);
    if (!ok)
    {
      // Syncing file failed, query notmuch for new filepath.
      m->type = MUTT_NOTMUCH;
      notmuch_database_t *db = nm_db_get(m, true);
      if (db)
      {
        notmuch_message_t *msg = get_nm_message(db, e);
 
        sync_email_path_with_nm(e, msg);
 
        buf_strcpy(&m->pathbuf, edata->folder);
        m->type = edata->type;
        ok = maildir_sync_mailbox_message(m, e, hc);
        m->type = MUTT_NOTMUCH;
      }
      nm_db_release(m);
      m->type = edata->type;
    }
 
    buf_strcpy(&m->pathbuf, url);
    m->type = MUTT_NOTMUCH;
 
    if (!ok)
    {
      mh_sync_errors += 1;
      continue;
    }
 
    if (!e->deleted)
      email_get_fullpath(e, new_file, sizeof(new_file));
 
    if (e->deleted || !mutt_str_equal(old_file, new_file))
    {
      if (e->deleted && (remove_filename(m, old_file) == 0))
        changed = true;
      else if (*new_file && *old_file && (rename_filename(m, old_file, new_file, e) == 0))
        changed = true;
    }
 
    FREE(&edata->oldpath);
  }
 
  if (mh_sync_errors > 0)
  {
    mutt_error(ngettext("Unable to sync %d message due to external mailbox modification",
                        "Unable to sync %d messages due to external mailbox modification",
                        mh_sync_errors),
               mh_sync_errors);
  }
 
  buf_strcpy(&m->pathbuf, url);
  m->type = MUTT_NOTMUCH;
 
  nm_db_release(m);
 
  if (changed)
  {
    mdata->mtime.tv_sec = mutt_date_now();
    mdata->mtime.tv_nsec = 0;
  }
 
  nm_hcache_close(&hc);
 
  progress_free(&progress);
  FREE(&url);
  mutt_debug(LL_DEBUG1, "nm: .... sync done [rc=%d]\n", rc);
  return rc;
}
 
static enum MxStatus nm_mbox_close(struct Mailbox *m)
{
  return MX_STATUS_OK;
}
 
static bool nm_msg_open(struct Mailbox *m, struct Message *msg, struct Email *e)
{
  char path[PATH_MAX] = { 0 };
  char *folder = nm_email_get_folder(e);
 
  snprintf(path, sizeof(path), "%s/%s", folder, e->path);
 
  msg->fp = mutt_file_fopen(path, "r");
  if (!msg->fp && (errno == ENOENT) && ((m->type == MUTT_MAILDIR) || (m->type == MUTT_NOTMUCH)))
  {
    msg->fp = maildir_open_find_message(folder, e->path, NULL);
  }
 
  return msg->fp != NULL;
}
 
static int nm_msg_commit(struct Mailbox *m, struct Message *msg)
{
  mutt_error(_("Can't write to virtual folder"));
  return -1;
}
 
static int nm_msg_close(struct Mailbox *m, struct Message *msg)
{
  mutt_file_fclose(&(msg->fp));
  return 0;
}
 
static int nm_tags_edit(struct Mailbox *m, const char *tags, struct Buffer *buf)
{
  buf_reset(buf);
  if (mw_get_field("Add/remove labels: ", buf, MUTT_COMP_NO_FLAGS, HC_OTHER,
                   &CompleteNmTagOps, NULL) != 0)
  {
    return -1;
  }
  return 1;
}
 
static int nm_tags_commit(struct Mailbox *m, struct Email *e, const char *buf)
{
  if (*buf == '\0')
    return 0; /* no tag change, so nothing to do */
 
  struct NmMboxData *mdata = nm_mdata_get(m);
  if (!mdata)
    return -1;
 
  notmuch_database_t *db = NULL;
  notmuch_message_t *msg = NULL;
  int rc = -1;
 
  if (!(db = nm_db_get(m, true)) || !(msg = get_nm_message(db, e)))
    goto done;
 
  mutt_debug(LL_DEBUG1, "nm: tags modify: '%s'\n", buf);
 
  update_tags(msg, buf);
  update_email_flags(m, e, buf);
  update_email_tags(e, msg);
  mutt_set_header_color(m, e);
 
  rc = 0;
  e->changed = true;
done:
  nm_db_release(m);
  if (e->changed)
  {
    mdata->mtime.tv_sec = mutt_date_now();
    mdata->mtime.tv_nsec = 0;
  }
  mutt_debug(LL_DEBUG1, "nm: tags modify done [rc=%d]\n", rc);
  return rc;
}
 
enum MailboxType nm_path_probe(const char *path, const struct stat *st)
{
  if (!mutt_istr_startswith(path, NmUrlProtocol))
    return MUTT_UNKNOWN;
 
  return MUTT_NOTMUCH;
}
 
static int nm_path_canon(struct Buffer *path)
{
  return 0;
}
 
const struct MxOps MxNotmuchOps = {
  // clang-format off
  .type             = MUTT_NOTMUCH,
  .name             = "notmuch",
  .is_local         = false,
  .ac_owns_path     = nm_ac_owns_path,
  .ac_add           = nm_ac_add,
  .mbox_open        = nm_mbox_open,
  .mbox_open_append = NULL,
  .mbox_check       = nm_mbox_check,
  .mbox_check_stats = nm_mbox_check_stats,
  .mbox_sync        = nm_mbox_sync,
  .mbox_close       = nm_mbox_close,
  .msg_open         = nm_msg_open,
  .msg_open_new     = maildir_msg_open_new,
  .msg_commit       = nm_msg_commit,
  .msg_close        = nm_msg_close,
  .msg_padding_size = NULL,
  .msg_save_hcache  = NULL,
  .tags_edit        = nm_tags_edit,
  .tags_commit      = nm_tags_commit,
  .path_probe       = nm_path_probe,
  .path_canon       = nm_path_canon,
  .path_is_empty    = NULL,
  // clang-format on
};