display.c File Reference

Pager Display. More...

#include "config.h"
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "mutt/lib.h"
#include "config/lib.h"
#include "core/lib.h"
#include "gui/lib.h"
#include "display.h"
#include "lib.h"
#include "color/lib.h"
#include "private_data.h"

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Functions
static int	check_sig (const char *s, struct Line *info, int offset)
	Check for an email signature.
static int	comp_syntax_t (const void *m1, const void *m2)
	Search for a Syntax using bsearch(3)
static void	resolve_color (struct MuttWindow *win, struct Line *lines, int line_num, int cnt, PagerFlags flags, int special, struct AnsiColor *ansi)
	Set the colour for a line of text.
static void	append_line (struct Line *lines, int line_num, int cnt)
	Add a new Line to the array.
static int	check_marker (const char *q, const char *p)
	Check that the unique marker is present.
static int	check_attachment_marker (const char *p)
	Check that the unique marker is present.
static int	check_protected_header_marker (const char *p)
	Check that the unique marker is present.
bool	mutt_is_quote_line (char *line, regmatch_t *pmatch)
	Is a line of message text a quote?
static void	match_body_patterns (char *pat, struct Line *lines, int line_num)
	Match body patterns, e.g.
bool	color_is_header (enum ColorId cid)
	Colour is for an Email header.
static void	resolve_types (struct MuttWindow *win, char *buf, char *raw, struct Line *lines, int line_num, int lines_used, struct QuoteStyle **quote_list, int *q_level, bool *force_redraw, bool q_classify)
	Determine the style for a line of text.
void	buf_strip_formatting (struct Buffer *dest, const char *src, bool strip_markers)
	Removes ANSI and backspace formatting.
static int	fill_buffer (FILE *fp, LOFF_T *bytes_read, LOFF_T offset, unsigned char **buf, unsigned char **fmt, size_t *blen, int *buf_ready)
	Fill a buffer from a file.
static int	format_line (struct MuttWindow *win, struct Line **lines, int line_num, unsigned char *buf, PagerFlags flags, struct AnsiColor *ansi, int cnt, int *pspace, int *pvch, int *pcol, int *pspecial, int width, struct AttrColorList *ansi_list)
	Display a line of text in the pager.
int	display_line (FILE *fp, LOFF_T *bytes_read, struct Line **lines, int line_num, int *lines_used, int *lines_max, PagerFlags flags, struct QuoteStyle **quote_list, int *q_level, bool *force_redraw, regex_t *search_re, struct MuttWindow *win_pager, struct AttrColorList *ansi_list)
	Print a line on screen.

Detailed Description

Pager Display.

Authors

• Richard Russon
• Pietro Cerutti
• Tóth János

Copyright

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file display.c.

Function Documentation

check_sig()

static int check_sig ( const char *  s, struct Line *  info, int  offset  )

static

Check for an email signature.

Parameters

s	Text to examine
info	Line info array to update
offset	An offset line to start the check from

Return values

0	Success
-1	Error

Definition at line 56 of file display.c.

{
  const unsigned int NUM_SIG_LINES = 4; // The amount of lines a signature takes
  unsigned int count = 0;
 
  while ((offset > 0) && (count <= NUM_SIG_LINES))
  {
    if (info[offset].cid != MT_COLOR_SIGNATURE)
      break;
    count++;
    offset--;
  }
 
  if (count == 0)
    return -1;
 
  if (count > NUM_SIG_LINES)
  {
    /* check for a blank line */
    while (*s)
    {
      if (!mutt_isspace(*s))
        return 0;
      s++;
    }
 
    return -1;
  }
 
  return 0;
}

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comp_syntax_t()

static int comp_syntax_t ( const void *  m1, const void *  m2  )

static

Search for a Syntax using bsearch(3)

Parameters

m1	Search key
m2	Array member

Return values

-1	m1 precedes m2
0	m1 matches m2
1	m2 precedes m1

Definition at line 96 of file display.c.

{
  const int *cnt = (const int *) m1;
  const struct TextSyntax *stx = (const struct TextSyntax *) m2;
 
  if (*cnt < stx->first)
    return -1;
  if (*cnt >= stx->last)
    return 1;
  return 0;
}

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resolve_color()

static void resolve_color ( struct MuttWindow *  win, struct Line *  lines, int  line_num, int  cnt, PagerFlags  flags, int  special, struct AnsiColor *  ansi  )

static

Set the colour for a line of text.

Parameters

win	Window
lines	Line info array
line_num	Line Number (index into lines)
cnt	If true, this is a continuation line
flags	Flags, see PagerFlags
special	Flags, e.g. A_BOLD
ansi	ANSI attributes

Definition at line 118 of file display.c.

{
  struct AttrColor def_color = { 0 }; /* color without syntax highlight */
  struct AttrColor color = { 0 };     /* final color */
  static struct AttrColor last_color = { 0 }; /* last color set */
  bool search = false;
  int m;
  struct TextSyntax *matching_chunk = NULL;
 
  if (cnt == 0)
  {
    last_color.curses_color = NULL;
    last_color.attrs = A_NORMAL;
  }
 
  if (lines[line_num].cont_line)
  {
    const bool c_markers = cs_subset_bool(NeoMutt->sub, "markers");
    if (!cnt && c_markers)
    {
      last_color = *mutt_curses_set_color_by_id(MT_COLOR_MARKERS);
      mutt_window_addch(win, '+');
    }
    m = (lines[line_num].syntax)[0].first;
    cnt += (lines[line_num].syntax)[0].last;
  }
  else
  {
    m = line_num;
  }
  if (flags & MUTT_PAGER_LOGS)
  {
    def_color = *(lines[line_num].syntax[0].attr_color);
  }
  else if (!(flags & MUTT_SHOWCOLOR))
  {
    if (flags & MUTT_PAGER_STRIPES)
    {
      def_color = *simple_color_get(((line_num % 2) == 0) ? MT_COLOR_STRIPE_ODD :
                                                            MT_COLOR_STRIPE_EVEN);
    }
    else
    {
      def_color = *simple_color_get(MT_COLOR_NORMAL);
    }
  }
  else if ((lines[m].cid == MT_COLOR_HEADER) && lines[m].syntax[0].attr_color)
  {
    def_color = *lines[m].syntax[0].attr_color;
  }
  else
  {
    def_color = *simple_color_get(lines[m].cid);
  }
 
  if ((flags & MUTT_SHOWCOLOR) && COLOR_QUOTED(lines[m].cid))
  {
    struct QuoteStyle *qc = lines[m].quote;
 
    if (qc)
    {
      def_color = attr_color_copy(qc->attr_color);
 
      while (qc && (qc->prefix_len > cnt))
      {
        def_color = attr_color_copy(qc->attr_color);
        qc = qc->up;
      }
    }
  }
 
  color = def_color;
  if ((flags & MUTT_SHOWCOLOR) && lines[m].syntax)
  {
    matching_chunk = bsearch(&cnt, lines[m].syntax, lines[m].syntax_arr_size,
                             sizeof(struct TextSyntax), comp_syntax_t);
    if (matching_chunk && (cnt >= matching_chunk->first) &&
        (cnt < matching_chunk->last))
    {
      if (matching_chunk->attr_color)
        color = *matching_chunk->attr_color;
    }
  }
 
  if ((flags & MUTT_SEARCH) && lines[m].search)
  {
    matching_chunk = bsearch(&cnt, lines[m].search, lines[m].search_arr_size,
                             sizeof(struct TextSyntax), comp_syntax_t);
    if (matching_chunk && (cnt >= matching_chunk->first) &&
        (cnt < matching_chunk->last))
    {
      color = *simple_color_get(MT_COLOR_SEARCH);
      search = true;
    }
  }
 
  /* handle "special" bold & underlined characters */
  if (special & A_BOLD)
  {
    if (simple_color_is_set(MT_COLOR_BOLD) && !search)
      color = *simple_color_get(MT_COLOR_BOLD);
    else
      color.attrs |= A_BOLD;
  }
  else if (special & A_UNDERLINE)
  {
    if (simple_color_is_set(MT_COLOR_UNDERLINE) && !search)
      color = *simple_color_get(MT_COLOR_UNDERLINE);
    else
      color.attrs |= A_UNDERLINE;
  }
  else if (special & A_ITALIC)
  {
    if (simple_color_is_set(MT_COLOR_ITALIC) && !search)
      color = *simple_color_get(MT_COLOR_ITALIC);
    else
      color.attrs |= A_ITALIC;
  }
  else if (ansi->attr_color)
  {
    color = *ansi->attr_color;
  }
 
  if (!attr_color_match(&color, &last_color))
  {
    const struct AttrColor *ac_merge = merged_color_overlay(simple_color_get(MT_COLOR_NORMAL),
                                                            &color);
    mutt_curses_set_color(ac_merge);
    last_color = color;
  }
}

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append_line()

static void append_line ( struct Line *  lines, int  line_num, int  cnt  )

static

Add a new Line to the array.

Parameters

lines	Array of Line info
line_num	Line number to add
cnt	Offset of the overflow if line is a continuation

Definition at line 257 of file display.c.

{
  int m;
 
  lines[line_num + 1].cid = lines[line_num].cid;
  (lines[line_num + 1].syntax)[0].attr_color = (lines[line_num].syntax)[0].attr_color;
  lines[line_num + 1].cont_line = true;
 
  /* find the real start of the line */
  for (m = line_num; m >= 0; m--)
    if (!lines[m].cont_line)
      break;
 
  (lines[line_num + 1].syntax)[0].first = m;
  (lines[line_num + 1].syntax)[0].last = (lines[line_num].cont_line) ?
                                             cnt + (lines[line_num].syntax)[0].last :
                                             cnt;
}

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check_marker()

static int check_marker ( const char *  q, const char *  p  )

static

Check that the unique marker is present.

Parameters

q	Marker string
p	String to check

Return values

num	Offset of marker

Definition at line 282 of file display.c.

{
  for (; (p[0] == q[0]) && (q[0] != '\0') && (p[0] != '\0') && (q[0] != '\a') &&
         (p[0] != '\a');
       p++, q++)
  {
  }
 
  return (int) (*p - *q);
}

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check_attachment_marker()

static int check_attachment_marker ( const char *  p )

static

Check that the unique marker is present.

Parameters

p	String to check

Return values

num	Offset of marker

Definition at line 298 of file display.c.

{
  return check_marker(state_attachment_marker(), p);
}

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check_protected_header_marker()

static int check_protected_header_marker ( const char *  p )

static

Check that the unique marker is present.

Parameters

p	String to check

Return values

num	Offset of marker

Definition at line 308 of file display.c.

{
  return check_marker(state_protected_header_marker(), p);
}

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mutt_is_quote_line()

bool mutt_is_quote_line	(	char *	line,
		regmatch_t *	pmatch
	)

Is a line of message text a quote?

Parameters

[in]	line	Line to test
[out]	pmatch	Regex sub-matches

Return values

true	Line is quoted

Checks if line matches the $quote_regex and doesn't match $smileys. This is used by the pager for calling qstyle_classify.

Definition at line 322 of file display.c.

{
  bool is_quote = false;
  const struct Regex *c_smileys = cs_subset_regex(NeoMutt->sub, "smileys");
  regmatch_t pmatch_internal[1] = { 0 };
 
  if (!pmatch)
    pmatch = pmatch_internal;
 
  const struct Regex *c_quote_regex = cs_subset_regex(NeoMutt->sub, "quote_regex");
  if (mutt_regex_capture(c_quote_regex, line, 1, pmatch))
  {
    regmatch_t smatch[1] = { 0 };
    if (mutt_regex_capture(c_smileys, line, 1, smatch))
    {
      if (smatch[0].rm_so > 0)
      {
        char c = line[smatch[0].rm_so];
        line[smatch[0].rm_so] = 0;
 
        if (mutt_regex_capture(c_quote_regex, line, 1, pmatch))
          is_quote = true;
 
        line[smatch[0].rm_so] = c;
      }
    }
    else
    {
      is_quote = true;
    }
  }
 
  return is_quote;
}

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match_body_patterns()

static void match_body_patterns ( char *  pat, struct Line *  lines, int  line_num  )

static

Match body patterns, e.g.

color quoted

Parameters

pat	Pattern to match
lines	Lines of text in the pager
line_num	Current line number

Definition at line 363 of file display.c.

{
  // don't consider line endings part of the buffer for regex matching
  bool has_nl = false;
  size_t buflen = mutt_str_len(pat);
  if ((buflen > 0) && (pat[buflen - 1] == '\n'))
  {
    has_nl = true;
    pat[buflen - 1] = '\0';
  }
 
  int i = 0;
  int offset = 0;
  struct RegexColor *color_line = NULL;
  struct RegexColorList *head = NULL;
  bool found = false;
  bool null_rx = false;
  regmatch_t pmatch[1] = { 0 };
 
  lines[line_num].syntax_arr_size = 0;
  if (lines[line_num].cid == MT_COLOR_HDRDEFAULT)
  {
    head = regex_colors_get_list(MT_COLOR_HEADER);
  }
  else
  {
    head = regex_colors_get_list(MT_COLOR_BODY);
  }
  STAILQ_FOREACH(color_line, head, entries)
  {
    color_line->stop_matching = false;
  }
 
  do
  {
    /* if has_nl, we've stripped off a trailing newline */
    if (offset >= (buflen - has_nl))
      break;
 
    if (!pat[offset])
      break;
 
    found = false;
    null_rx = false;
    STAILQ_FOREACH(color_line, head, entries)
    {
      if (color_line->stop_matching)
        continue;
 
      if ((regexec(&color_line->regex, pat + offset, 1, pmatch,
                   ((offset != 0) ? REG_NOTBOL : 0)) != 0))
      {
        /* Once a regex fails to match, don't try matching it again.
         * On very long lines this can cause a performance issue if there
         * are other regexes that have many matches. */
        color_line->stop_matching = true;
        continue;
      }
 
      if (pmatch[0].rm_eo == pmatch[0].rm_so)
      {
        null_rx = true; // empty regex; don't add it, but keep looking
        continue;
      }
 
      if (!found)
      {
        // Abort if we fill up chunks. Yes, this really happened.
        if (lines[line_num].syntax_arr_size == SHRT_MAX)
        {
          null_rx = false;
          break;
        }
        if (++(lines[line_num].syntax_arr_size) > 1)
        {
          MUTT_MEM_REALLOC(&(lines[line_num].syntax),
                           lines[line_num].syntax_arr_size, struct TextSyntax);
          // Zero the new entry
          const int index = lines[line_num].syntax_arr_size - 1;
          struct TextSyntax *ts = &lines[line_num].syntax[index];
          memset(ts, 0, sizeof(*ts));
        }
      }
      i = lines[line_num].syntax_arr_size - 1;
      pmatch[0].rm_so += offset;
      pmatch[0].rm_eo += offset;
 
      if (!found || (pmatch[0].rm_so < (lines[line_num].syntax)[i].first) ||
          ((pmatch[0].rm_so == (lines[line_num].syntax)[i].first) &&
           (pmatch[0].rm_eo > (lines[line_num].syntax)[i].last)))
      {
        (lines[line_num].syntax)[i].attr_color = &color_line->attr_color;
        (lines[line_num].syntax)[i].first = pmatch[0].rm_so;
        (lines[line_num].syntax)[i].last = pmatch[0].rm_eo;
      }
      else if ((pmatch[0].rm_so == (lines[line_num].syntax)[i].first) &&
               (pmatch[0].rm_eo == (lines[line_num].syntax)[i].last))
      {
        (lines[line_num].syntax)[i].attr_color = merged_color_overlay(
            (lines[line_num].syntax)[i].attr_color, &color_line->attr_color);
        (lines[line_num].syntax)[i].first = pmatch[0].rm_so;
        (lines[line_num].syntax)[i].last = pmatch[0].rm_eo;
      }
 
      found = true;
      null_rx = false;
    }
 
    if (null_rx)
      offset++; /* avoid degenerate cases */
    else
      offset = (lines[line_num].syntax)[i].last;
  } while (found || null_rx);
 
  if (has_nl)
    pat[buflen - 1] = '\n';
}

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color_is_header()

bool color_is_header

(

enum ColorId

cid

)

Colour is for an Email header.

Parameters

cid	Colour ID, e.g. MT_COLOR_HEADER

Return values

true	Colour is for an Email header

Definition at line 486 of file display.c.

{
  return (cid == MT_COLOR_HEADER) || (cid == MT_COLOR_HDRDEFAULT);
}

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resolve_types()

static void resolve_types ( struct MuttWindow *  win, char *  buf, char *  raw, struct Line *  lines, int  line_num, int  lines_used, struct QuoteStyle **  quote_list, int *  q_level, bool *  force_redraw, bool  q_classify  )

static

Determine the style for a line of text.

Parameters

[in]	win	Window
[in]	buf	Formatted text
[in]	raw	Raw text
[in]	lines	Line info array
[in]	line_num	Line number (index into lines)
[in]	lines_used	Last line
[out]	quote_list	List of quote colours
[out]	q_level	Quote level
[out]	force_redraw	Set to true if a screen redraw is needed
[in]	q_classify	If true, style the text

Definition at line 504 of file display.c.

{
  struct RegexColor *color_line = NULL;
  regmatch_t pmatch[1] = { 0 };
  const bool c_header_color_partial = cs_subset_bool(NeoMutt->sub, "header_color_partial");
  int offset, i = 0;
 
  if ((line_num == 0) || color_is_header(lines[line_num - 1].cid) ||
      (check_protected_header_marker(raw) == 0))
  {
    if (buf[0] == '\n') /* end of header */
    {
      lines[line_num].cid = MT_COLOR_NORMAL;
      mutt_window_get_coords(win, &BrailleRow, &BrailleCol);
    }
    else
    {
      /* if this is a continuation of the previous line, use the previous
       * line's color as default. */
      if ((line_num > 0) && ((buf[0] == ' ') || (buf[0] == '\t')))
      {
        lines[line_num].cid = lines[line_num - 1].cid; /* wrapped line */
        if (!c_header_color_partial)
        {
          (lines[line_num].syntax)[0].attr_color =
              (lines[line_num - 1].syntax)[0].attr_color;
          lines[line_num].cont_header = true;
        }
      }
      else
      {
        lines[line_num].cid = MT_COLOR_HDRDEFAULT;
      }
 
      /* When this option is unset, we color the entire header the
       * same color.  Otherwise, we handle the header patterns just
       * like body patterns (further below).  */
      if (!c_header_color_partial)
      {
        STAILQ_FOREACH(color_line, regex_colors_get_list(MT_COLOR_HEADER), entries)
        {
          if (regexec(&color_line->regex, buf, 0, NULL, 0) == 0)
          {
            lines[line_num].cid = MT_COLOR_HEADER;
            lines[line_num].syntax[0].attr_color =
                merged_color_overlay(lines[line_num].syntax[0].attr_color,
                                     simple_color_get(MT_COLOR_HDRDEFAULT));
            lines[line_num].syntax[0].attr_color = merged_color_overlay(
                lines[line_num].syntax[0].attr_color, &color_line->attr_color);
            if (lines[line_num].cont_header)
            {
              /* adjust the previous continuation lines to reflect the color of this continuation line */
              int j;
              for (j = line_num - 1; j >= 0 && lines[j].cont_header; j--)
              {
                lines[j].cid = lines[line_num].cid;
                lines[j].syntax[0].attr_color = lines[line_num].syntax[0].attr_color;
              }
              /* now adjust the first line of this header field */
              if (j >= 0)
              {
                lines[j].cid = lines[line_num].cid;
                lines[j].syntax[0].attr_color = lines[line_num].syntax[0].attr_color;
              }
              *force_redraw = true; /* the previous lines have already been drawn on the screen */
            }
          }
        }
      }
    }
  }
  else if (mutt_str_startswith(raw, "\033[0m")) // Escape: a little hack...
  {
    lines[line_num].cid = MT_COLOR_NORMAL;
  }
  else if (check_attachment_marker((char *) raw) == 0)
  {
    lines[line_num].cid = MT_COLOR_ATTACHMENT;
  }
  else if (mutt_str_equal("-- \n", buf) || mutt_str_equal("-- \r\n", buf))
  {
    i = line_num + 1;
 
    lines[line_num].cid = MT_COLOR_SIGNATURE;
    while ((i < lines_used) && (check_sig(buf, lines, i - 1) == 0) &&
           ((lines[i].cid == MT_COLOR_NORMAL) || COLOR_QUOTED(lines[i].cid) ||
            (lines[i].cid == MT_COLOR_HEADER)))
    {
      /* oops... */
      if (lines[i].syntax_arr_size)
      {
        lines[i].syntax_arr_size = 0;
        MUTT_MEM_REALLOC(&(lines[line_num].syntax), 1, struct TextSyntax);
      }
      lines[i++].cid = MT_COLOR_SIGNATURE;
    }
  }
  else if (check_sig(buf, lines, line_num - 1) == 0)
  {
    lines[line_num].cid = MT_COLOR_SIGNATURE;
  }
  else if (mutt_is_quote_line(buf, pmatch))
  {
    if (q_classify && !lines[line_num].quote)
    {
      lines[line_num].quote = qstyle_classify(quote_list, buf + pmatch[0].rm_so,
                                              pmatch[0].rm_eo - pmatch[0].rm_so,
                                              force_redraw, q_level);
    }
    lines[line_num].cid = MT_COLOR_QUOTED0;
  }
  else
  {
    lines[line_num].cid = MT_COLOR_NORMAL;
  }
 
  /* body patterns */
  if ((lines[line_num].cid == MT_COLOR_NORMAL) || COLOR_QUOTED(lines[line_num].cid) ||
      ((lines[line_num].cid == MT_COLOR_HDRDEFAULT) && c_header_color_partial))
  {
    match_body_patterns(buf, lines, line_num);
  }
 
  /* attachment patterns */
  if (lines[line_num].cid == MT_COLOR_ATTACHMENT)
  {
    size_t nl;
 
    /* don't consider line endings part of the buffer for regex matching */
    nl = mutt_str_len(buf);
    if ((nl > 0) && (buf[nl - 1] == '\n'))
      buf[nl - 1] = '\0';
 
    i = 0;
    offset = 0;
    lines[line_num].syntax_arr_size = 0;
    struct AttrColor *ac_attach = simple_color_get(MT_COLOR_ATTACHMENT);
    bool found = false;
    bool null_rx = false;
    do
    {
      if (!buf[offset])
        break;
 
      found = false;
      null_rx = false;
      STAILQ_FOREACH(color_line, regex_colors_get_list(MT_COLOR_ATTACH_HEADERS), entries)
      {
        if (regexec(&color_line->regex, buf + offset, 1, pmatch,
                    ((offset != 0) ? REG_NOTBOL : 0)) != 0)
        {
          continue;
        }
 
        if (pmatch[0].rm_eo != pmatch[0].rm_so)
        {
          if (!found)
          {
            if (++(lines[line_num].syntax_arr_size) > 1)
            {
              MUTT_MEM_REALLOC(&(lines[line_num].syntax),
                               lines[line_num].syntax_arr_size, struct TextSyntax);
              // Zero the new entry
              const int index = lines[line_num].syntax_arr_size - 1;
              struct TextSyntax *ts = &lines[line_num].syntax[index];
              memset(ts, 0, sizeof(*ts));
            }
          }
          i = lines[line_num].syntax_arr_size - 1;
          pmatch[0].rm_so += offset;
          pmatch[0].rm_eo += offset;
          if (!found || (pmatch[0].rm_so < (lines[line_num].syntax)[i].first) ||
              ((pmatch[0].rm_so == (lines[line_num].syntax)[i].first) &&
               (pmatch[0].rm_eo > (lines[line_num].syntax)[i].last)))
          {
            if (!(lines[line_num].syntax)[i].attr_color)
              (lines[line_num].syntax)[i].attr_color = ac_attach;
 
            (lines[line_num].syntax)[i].attr_color = merged_color_overlay(
                (lines[line_num].syntax)[i].attr_color, &color_line->attr_color);
            (lines[line_num].syntax)[i].first = pmatch[0].rm_so;
            (lines[line_num].syntax)[i].last = pmatch[0].rm_eo;
          }
          else if ((pmatch[0].rm_so == (lines[line_num].syntax)[i].first) &&
                   (pmatch[0].rm_eo == (lines[line_num].syntax)[i].last))
          {
            (lines[line_num].syntax)[i].attr_color = merged_color_overlay(
                (lines[line_num].syntax)[i].attr_color, &color_line->attr_color);
            (lines[line_num].syntax)[i].first = pmatch[0].rm_so;
            (lines[line_num].syntax)[i].last = pmatch[0].rm_eo;
          }
          found = 1;
          null_rx = false;
        }
        else
        {
          null_rx = true; /* empty regex; don't add it, but keep looking */
        }
      }
 
      if (null_rx)
        offset++; /* avoid degenerate cases */
      else
        offset = (lines[line_num].syntax)[i].last;
    } while (found || null_rx);
    if (nl > 0)
      buf[nl] = '\n';
  }
}

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buf_strip_formatting()

void buf_strip_formatting	(	struct Buffer *	dest,
		const char *	src,
		bool	strip_markers
	)

Removes ANSI and backspace formatting.

Parameters

dest	Buffer for the result
src	String to strip
strip_markers	Remove

Removes ANSI and backspace formatting, and optionally markers. This is separated out so that it can be used both by the pager and the autoview handler.

This logic is pulled from the pager fill_buffer() function, for use in stripping reply-quoted autoview output of ansi sequences.

Definition at line 730 of file display.c.

{
  const char *s = src;
 
  buf_reset(dest);
 
  if (!s)
    return;
 
  while (s[0] != '\0')
  {
    if ((s[0] == '\010') && (s > src))
    {
      if (s[1] == '_') /* underline */
      {
        s += 2;
      }
      else if (s[1] && buf_len(dest)) /* bold or overstrike */
      {
        dest->dptr--;
        buf_addch(dest, s[1]);
        s += 2;
      }
      else /* ^H */
      {
        buf_addch(dest, *s++);
      }
      continue;
    }
 
    int len = ansi_color_seq_length(s);
    if (len > 0)
    {
      s += len;
    }
    else if (strip_markers && (s[0] == '\033') && (s[1] == ']') &&
             ((check_attachment_marker(s) == 0) || (check_protected_header_marker(s) == 0)))
    {
      mutt_debug(LL_DEBUG2, "Seen attachment marker\n");
      while (*s++ != '\a')
        ; /* skip pseudo-ANSI sequence */
    }
    else
    {
      buf_addch(dest, *s++);
    }
  }
}

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fill_buffer()

static int fill_buffer ( FILE *  fp, LOFF_T *  bytes_read, LOFF_T  offset, unsigned char **  buf, unsigned char **  fmt, size_t *  blen, int *  buf_ready  )

static

Fill a buffer from a file.

Parameters

[in]	fp	File to read from
[in,out]	bytes_read	End of last read
[in]	offset	Position start reading from
[out]	buf	Buffer to fill
[out]	fmt	Copy of buffer, stripped of attributes
[out]	blen	Length of the buffer
[in,out]	buf_ready	true if the buffer already has data in it

Return values

>=0	Bytes read
-1	Error

Definition at line 791 of file display.c.

{
  static int b_read = 0;
 
  if (*buf_ready == 0)
  {
    if (offset != *bytes_read)
    {
      if (!mutt_file_seek(fp, offset, SEEK_SET))
      {
        return -1;
      }
    }
 
    *buf = (unsigned char *) mutt_file_read_line((char *) *buf, blen, fp, NULL, MUTT_RL_EOL);
    if (!*buf)
    {
      fmt[0] = NULL;
      return -1;
    }
 
    *bytes_read = ftello(fp);
    b_read = (int) (*bytes_read - offset);
    *buf_ready = 1;
 
    struct Buffer *stripped = buf_pool_get();
    buf_alloc(stripped, *blen);
    buf_strip_formatting(stripped, (const char *) *buf, 1);
    /* This should be a noop, because *fmt should be NULL */
    FREE(fmt);
    *fmt = (unsigned char *) buf_strdup(stripped);
    buf_pool_release(&stripped);
  }
 
  return b_read;
}

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format_line()

static int format_line ( struct MuttWindow *  win, struct Line **  lines, int  line_num, unsigned char *  buf, PagerFlags  flags, struct AnsiColor *  ansi, int  cnt, int *  pspace, int *  pvch, int *  pcol, int *  pspecial, int  width, struct AttrColorList *  ansi_list  )

static

Display a line of text in the pager.

Parameters

[in]	win	Window
[out]	lines	Line info
[in]	line_num	Line number (index into lines)
[in]	buf	Text to display
[in]	flags	Flags, see PagerFlags
[out]	ansi	ANSI attributes used
[in]	cnt	Length of text buffer
[out]	pspace	Index of last whitespace character
[out]	pvch	Number of bytes read
[out]	pcol	Number of columns used
[out]	pspecial	Attribute flags, e.g. A_UNDERLINE
[in]	width	Width of screen (to wrap to)
[out]	ansi_list	List of unique Ansi colours

Return values

num	Number of characters displayed

Definition at line 846 of file display.c.

{
  int space = -1; /* index of the last space or TAB */
  const bool c_markers = cs_subset_bool(NeoMutt->sub, "markers");
  size_t col = c_markers ? (*lines)[line_num].cont_line : 0;
  size_t k;
  int ch, vch, last_special = -1, special = 0, t;
  wchar_t wc = 0;
  mbstate_t mbstate = { 0 }; // FIXME: this should come from lines
  const size_t c_wrap = cs_subset_number(NeoMutt->sub, "wrap");
  size_t wrap_cols = mutt_window_wrap_cols(width, (flags & MUTT_PAGER_NOWRAP) ? 0 : c_wrap);
 
  if (check_attachment_marker((char *) buf) == 0)
    wrap_cols = width;
 
  struct PagerPrivateData *priv = win->parent->wdata;
  enum PagerMode mode = priv->pview->mode;
  const bool c_allow_ansi = (mode == PAGER_MODE_OTHER) ||
                            cs_subset_bool(NeoMutt->sub, "allow_ansi");
 
  for (ch = 0, vch = 0; ch < cnt; ch += k, vch += k)
  {
    /* Handle ANSI sequences */
    if (buf[ch] == '\033') // Escape
    {
      int len = ansi_color_parse((const char *) buf + ch, ansi, ansi_list, !c_allow_ansi);
      ch += len;
    }
 
    while ((cnt - ch >= 2) && (buf[ch] == '\033') && (buf[ch + 1] == ']') && // Escape
           ((check_attachment_marker((char *) buf + ch) == 0) ||
            (check_protected_header_marker((char *) buf + ch) == 0)))
    {
      while (buf[ch++] != '\a')
        if (ch >= cnt)
          break;
    }
 
    /* is anything left to do? */
    if (ch >= cnt)
      break;
 
    k = mbrtowc(&wc, (char *) buf + ch, cnt - ch, &mbstate);
    if ((k == ICONV_BUF_TOO_SMALL) || (k == ICONV_ILLEGAL_SEQ))
    {
      if (k == ICONV_ILLEGAL_SEQ)
        memset(&mbstate, 0, sizeof(mbstate));
      mutt_debug(LL_DEBUG1, "mbrtowc returned %zu; errno = %d\n", k, errno);
      if ((col + 4) > wrap_cols)
        break;
      col += 4;
      if (ansi)
        mutt_window_printf(win, "\\%03o", buf[ch]);
      k = 1;
      continue;
    }
    if (k == 0)
      k = 1;
 
    if (CharsetIsUtf8)
    {
      /* zero width space, zero with non-joiner, zero width no-break space */
      if ((wc == 0x200B) || (wc == 0x200C) || (wc == 0xFEFF))
      {
        mutt_debug(LL_DEBUG3, "skip zero-width character U+%04X\n", (unsigned short) wc);
        continue;
      }
      if (mutt_mb_is_display_corrupting_utf8(wc))
      {
        mutt_debug(LL_DEBUG3, "filtered U+%04X\n", (unsigned short) wc);
        continue;
      }
    }
 
    /* Handle backspace */
    special = 0;
    if (IsWPrint(wc))
    {
      wchar_t wc1 = 0;
      mbstate_t mbstate1 = mbstate;
      size_t k1 = mbrtowc(&wc1, (char *) buf + ch + k, cnt - ch - k, &mbstate1);
      while ((k1 != ICONV_BUF_TOO_SMALL) && (k1 != ICONV_ILLEGAL_SEQ) &&
             (k1 > 0) && (wc1 == '\b'))
      {
        const size_t k2 = mbrtowc(&wc1, (char *) buf + ch + k + k1,
                                  cnt - ch - k - k1, &mbstate1);
        if ((k2 == ICONV_BUF_TOO_SMALL) || (k2 == ICONV_ILLEGAL_SEQ) ||
            (k2 == 0) || (!IsWPrint(wc1)))
        {
          break;
        }
 
        if (wc == wc1)
        {
          special |= ((wc == '_') && (special & A_UNDERLINE)) ? A_UNDERLINE : A_BOLD;
        }
        else if ((wc == '_') || (wc1 == '_'))
        {
          special |= A_UNDERLINE;
          wc = (wc1 == '_') ? wc : wc1;
        }
        else
        {
          /* special = 0; / * overstrike: nothing to do! */
          wc = wc1;
        }
 
        ch += k + k1;
        k = k2;
        mbstate = mbstate1;
        k1 = mbrtowc(&wc1, (char *) buf + ch + k, cnt - ch - k, &mbstate1);
      }
    }
 
    if (ansi && ((flags & (MUTT_SHOWCOLOR | MUTT_SEARCH | MUTT_PAGER_MARKER)) ||
                 special || last_special || (ansi->attrs != A_NORMAL)))
    {
      resolve_color(win, *lines, line_num, vch, flags, special, ansi);
      last_special = special;
    }
 
    /* no-break space, narrow no-break space */
    if (IsWPrint(wc) || (CharsetIsUtf8 && ((wc == 0x00A0) || (wc == 0x202F))))
    {
      if (wc == ' ')
      {
        space = ch;
      }
      t = wcwidth(wc);
      if (col + t > wrap_cols)
        break;
      col += t;
      if (ansi)
        mutt_addwch(win, wc);
    }
    else if (wc == '\n')
    {
      break;
    }
    else if (wc == '\t')
    {
      space = ch;
      t = (col & ~7) + 8;
      if (t > wrap_cols)
        break;
      if (ansi)
        for (; col < t; col++)
          mutt_window_addch(win, ' ');
      else
        col = t;
    }
    else if ((wc < 0x20) || (wc == 0x7f))
    {
      if ((col + 2) > wrap_cols)
        break;
      col += 2;
      if (ansi)
        mutt_window_printf(win, "^%c", (char) (('@' + wc) & 0x7f));
    }
    else if (wc < 0x100)
    {
      if ((col + 4) > wrap_cols)
        break;
      col += 4;
      if (ansi)
        mutt_window_printf(win, "\\%03lo", (long) wc);
    }
    else
    {
      if ((col + 1) > wrap_cols)
        break;
      col += k;
      if (ansi)
        mutt_addwch(win, ReplacementChar);
    }
  }
  *pspace = space;
  *pcol = col;
  *pvch = vch;
  *pspecial = special;
  return ch;
}

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display_line()

int display_line	(	FILE *	fp,
		LOFF_T *	bytes_read,
		struct Line **	lines,
		int	line_num,
		int *	lines_used,
		int *	lines_max,
		PagerFlags	flags,
		struct QuoteStyle **	quote_list,
		int *	q_level,
		bool *	force_redraw,
		regex_t *	search_re,
		struct MuttWindow *	win_pager,
		struct AttrColorList *	ansi_list
	)

Print a line on screen.

Parameters

[in]	fp	File to read from
[out]	bytes_read	Offset into file
[out]	lines	Line attributes
[in]	line_num	Line number
[out]	lines_used	Last line
[out]	lines_max	Maximum number of lines
[in]	flags	Flags, see PagerFlags
[out]	quote_list	Email quoting style
[out]	q_level	Level of quoting
[out]	force_redraw	Force a repaint
[out]	search_re	Regex to highlight
[in]	win_pager	Window to draw into
[in]	ansi_list	List of ANSI colours/attributes

Return values

-1	EOF was reached
0	normal exit, line was not displayed
>0	normal exit, line was displayed

Definition at line 1051 of file display.c.

{
  unsigned char *buf = NULL, *fmt = NULL;
  size_t buflen = 0;
  unsigned char *buf_ptr = NULL;
  int ch, vch, col, cnt, b_read;
  int buf_ready = 0;
  bool change_last = false;
  int special;
  int offset;
  const struct AttrColor *def_color = NULL;
  int m;
  int rc = -1;
  struct AnsiColor ansi = { { COLOR_DEFAULT, 0, 0 }, { COLOR_DEFAULT, 0, 0 }, 0, NULL };
  regmatch_t pmatch[1] = { 0 };
 
  struct PagerPrivateData *priv = win_pager->parent->wdata;
  enum PagerMode mode = priv->pview->mode;
 
  if (line_num == *lines_used)
  {
    (*lines_used)++;
    change_last = true;
  }
 
  if (*lines_used == *lines_max)
  {
    *lines_max += LINES;
    MUTT_MEM_REALLOC(lines, *lines_max, struct Line);
    for (ch = *lines_used; ch < *lines_max; ch++)
    {
      memset(&((*lines)[ch]), 0, sizeof(struct Line));
      (*lines)[ch].cid = -1;
      (*lines)[ch].search_arr_size = -1;
      (*lines)[ch].syntax = MUTT_MEM_CALLOC(1, struct TextSyntax);
      ((*lines)[ch].syntax)[0].first = -1;
      ((*lines)[ch].syntax)[0].last = -1;
    }
  }
 
  struct Line *const cur_line = &(*lines)[line_num];
 
  if (flags & MUTT_PAGER_LOGS)
  {
    /* determine the line class */
    if (fill_buffer(fp, bytes_read, cur_line->offset, &buf, &fmt, &buflen, &buf_ready) < 0)
    {
      if (change_last)
        (*lines_used)--;
      goto out;
    }
 
    if ((cur_line->cont_line) && (line_num > 0))
    {
      struct Line *const old_line = &(*lines)[line_num - 1];
      cur_line->cid = old_line->cid;
      cur_line->syntax[0].attr_color = old_line->syntax[0].attr_color;
    }
    else
    {
      cur_line->cid = MT_COLOR_NORMAL;
      if (buf[11] == 'M')
        cur_line->syntax[0].attr_color = simple_color_get(MT_COLOR_MESSAGE);
      else if (buf[11] == 'W')
        cur_line->syntax[0].attr_color = simple_color_get(MT_COLOR_WARNING);
      else if (buf[11] == 'E')
        cur_line->syntax[0].attr_color = simple_color_get(MT_COLOR_ERROR);
      else
        cur_line->syntax[0].attr_color = simple_color_get(MT_COLOR_NORMAL);
    }
  }
 
  /* only do color highlighting if we are viewing a message */
  if (flags & (MUTT_SHOWCOLOR | MUTT_TYPES))
  {
    if (cur_line->cid == -1)
    {
      /* determine the line class */
      if (fill_buffer(fp, bytes_read, cur_line->offset, &buf, &fmt, &buflen, &buf_ready) < 0)
      {
        if (change_last)
          (*lines_used)--;
        goto out;
      }
 
      if (mode == PAGER_MODE_EMAIL)
      {
        resolve_types(win_pager, (char *) fmt, (char *) buf, *lines, line_num, *lines_used,
                      quote_list, q_level, force_redraw, flags & MUTT_SHOWCOLOR);
      }
      else
      {
        (*lines)[line_num].cid = MT_COLOR_NORMAL;
      }
 
      /* avoid race condition for continuation lines when scrolling up */
      for (m = line_num + 1;
           m < *lines_used && (*lines)[m].offset && (*lines)[m].cont_line; m++)
      {
        (*lines)[m].cid = cur_line->cid;
      }
    }
 
    /* this also prevents searching through the hidden lines */
    const short c_toggle_quoted_show_levels = cs_subset_number(NeoMutt->sub, "toggle_quoted_show_levels");
    if ((flags & MUTT_HIDE) && COLOR_QUOTED(cur_line->cid) &&
        (!cur_line->quote || (cur_line->quote->quote_n >= c_toggle_quoted_show_levels)))
    {
      flags = 0; /* MUTT_NOSHOW */
    }
  }
 
  /* At this point, (*lines[line_num]).quote may still be undefined. We
   * don't want to compute it every time MUTT_TYPES is set, since this
   * would slow down the "bottom" function unacceptably. A compromise
   * solution is hence to call regexec() again, just to find out the
   * length of the quote prefix.  */
  if ((flags & MUTT_SHOWCOLOR) && !cur_line->cont_line &&
      COLOR_QUOTED(cur_line->cid) && !cur_line->quote)
  {
    if (fill_buffer(fp, bytes_read, cur_line->offset, &buf, &fmt, &buflen, &buf_ready) < 0)
    {
      if (change_last)
        (*lines_used)--;
      goto out;
    }
 
    const struct Regex *c_quote_regex = cs_subset_regex(NeoMutt->sub, "quote_regex");
    if (mutt_regex_capture(c_quote_regex, (char *) fmt, 1, pmatch))
    {
      cur_line->quote = qstyle_classify(quote_list, (char *) fmt + pmatch[0].rm_so,
                                        pmatch[0].rm_eo - pmatch[0].rm_so,
                                        force_redraw, q_level);
    }
    else
    {
      goto out;
    }
  }
 
  if ((flags & MUTT_SEARCH) && !cur_line->cont_line && (cur_line->search_arr_size == -1))
  {
    if (fill_buffer(fp, bytes_read, cur_line->offset, &buf, &fmt, &buflen, &buf_ready) < 0)
    {
      if (change_last)
        (*lines_used)--;
      goto out;
    }
 
    offset = 0;
    cur_line->search_arr_size = 0;
    while (regexec(search_re, (char *) fmt + offset, 1, pmatch,
                   (offset ? REG_NOTBOL : 0)) == 0)
    {
      if (++(cur_line->search_arr_size) > 1)
      {
        MUTT_MEM_REALLOC(&(cur_line->search), cur_line->search_arr_size, struct TextSyntax);
        // Zero the new entry
        const int index = cur_line->search_arr_size - 1;
        struct TextSyntax *ts = &cur_line->search[index];
        memset(ts, 0, sizeof(*ts));
      }
      else
      {
        cur_line->search = MUTT_MEM_CALLOC(1, struct TextSyntax);
      }
      pmatch[0].rm_so += offset;
      pmatch[0].rm_eo += offset;
      (cur_line->search)[cur_line->search_arr_size - 1].first = pmatch[0].rm_so;
      (cur_line->search)[cur_line->search_arr_size - 1].last = pmatch[0].rm_eo;
 
      if (pmatch[0].rm_eo == pmatch[0].rm_so)
        offset++; /* avoid degenerate cases */
      else
        offset = pmatch[0].rm_eo;
      if (!fmt[offset])
        break;
    }
  }
 
  if (!(flags & MUTT_SHOW) && ((*lines)[line_num + 1].offset > 0))
  {
    /* we've already scanned this line, so just exit */
    rc = 0;
    goto out;
  }
  if ((flags & MUTT_SHOWCOLOR) && *force_redraw && ((*lines)[line_num + 1].offset > 0))
  {
    /* no need to try to display this line... */
    rc = 1;
    goto out; /* fake display */
  }
 
  b_read = fill_buffer(fp, bytes_read, cur_line->offset, &buf, &fmt, &buflen, &buf_ready);
  if (b_read < 0)
  {
    if (change_last)
      (*lines_used)--;
    goto out;
  }
 
  /* now chose a good place to break the line */
  cnt = format_line(win_pager, lines, line_num, buf, flags, NULL, b_read, &ch,
                    &vch, &col, &special, win_pager->state.cols, ansi_list);
  buf_ptr = buf + cnt;
 
  /* move the break point only if smart_wrap is set */
  const bool c_smart_wrap = cs_subset_bool(NeoMutt->sub, "smart_wrap");
  if (c_smart_wrap)
  {
    if ((cnt < b_read) && (ch != -1) && !color_is_header(cur_line->cid) &&
        !mutt_isspace(buf[cnt]))
    {
      buf_ptr = buf + ch;
      /* skip trailing blanks */
      while (ch && ((buf[ch] == ' ') || (buf[ch] == '\t') || (buf[ch] == '\r')))
        ch--;
 
      /* A folded header with a single long word shouldn't be smartwrapped.
       * So just disable smart_wrap if it would wrap at the beginning of the line. */
      if (ch == 0)
        buf_ptr = buf + cnt;
      else
        cnt = ch + 1;
    }
 
    /* skip leading blanks on the next line too */
    while ((*buf_ptr == ' ') || (*buf_ptr == '\t'))
      buf_ptr++;
  }
 
  if (*buf_ptr == '\r')
    buf_ptr++;
  if (*buf_ptr == '\n')
    buf_ptr++;
 
  if (((int) (buf_ptr - buf) < b_read) && !(*lines)[line_num + 1].cont_line)
    append_line(*lines, line_num, (int) (buf_ptr - buf));
  (*lines)[line_num + 1].offset = cur_line->offset + (long) (buf_ptr - buf);
 
  /* if we don't need to display the line we are done */
  if (!(flags & MUTT_SHOW))
  {
    rc = 0;
    goto out;
  }
 
  if (flags & MUTT_PAGER_STRIPES)
  {
    const enum ColorId cid = ((line_num % 2) == 0) ? MT_COLOR_STRIPE_ODD : MT_COLOR_STRIPE_EVEN;
    mutt_curses_set_color_by_id(cid);
  }
 
  /* display the line */
  format_line(win_pager, lines, line_num, buf, flags, &ansi, cnt, &ch, &vch,
              &col, &special, win_pager->state.cols, ansi_list);
 
  /* avoid a bug in ncurses... */
  if (col == 0)
  {
    if (flags & MUTT_PAGER_STRIPES)
    {
      const enum ColorId cid = ((line_num % 2) == 0) ? MT_COLOR_STRIPE_ODD : MT_COLOR_STRIPE_EVEN;
      mutt_curses_set_normal_backed_color_by_id(cid);
    }
    else
    {
      mutt_curses_set_color_by_id(MT_COLOR_NORMAL);
    }
 
    mutt_window_addch(win_pager, ' ');
  }
 
  /* Fill the blank space at the end of the line with the prevailing color.
   * ncurses does an implicit clrtoeol() when you do mutt_window_addch('\n') so we have
   * to make sure to reset the color *after* that */
  if (flags & MUTT_SHOWCOLOR)
  {
    m = (cur_line->cont_line) ? (cur_line->syntax)[0].first : line_num;
    if ((*lines)[m].cid == MT_COLOR_HEADER)
    {
      def_color = ((*lines)[m].syntax)[0].attr_color;
    }
    else
    {
      def_color = simple_color_get((*lines)[m].cid);
    }
    const struct AttrColor *ac_normal = simple_color_get(MT_COLOR_NORMAL);
    const struct AttrColor *ac_eol = NULL;
    if (def_color)
      ac_eol = merged_color_overlay(ac_normal, def_color);
    else
      ac_eol = ac_normal;
    mutt_curses_set_color(ac_eol);
  }
 
  if (col < win_pager->state.cols)
  {
    if (flags & MUTT_PAGER_STRIPES)
    {
      const enum ColorId cid = ((line_num % 2) == 0) ? MT_COLOR_STRIPE_ODD : MT_COLOR_STRIPE_EVEN;
      const struct AttrColor *ac_normal = simple_color_get(MT_COLOR_NORMAL);
      const struct AttrColor *stripe_color = simple_color_get(cid);
      const struct AttrColor *ac_eol = merged_color_overlay(ac_normal, stripe_color);
      mutt_curses_set_color(ac_eol);
    }
    else
    {
      // Colours may be disabled, but we may still need to end the "search" colour
      if (!(flags & MUTT_SHOWCOLOR))
        mutt_curses_set_color_by_id(MT_COLOR_NORMAL);
    }
    mutt_window_clrtoeol(win_pager);
  }
 
  /* reset the color back to normal.  This *must* come after the
   * clrtoeol, otherwise the color for this line will not be
   * filled to the right margin.  */
  if (flags & MUTT_SHOWCOLOR)
    mutt_curses_set_color_by_id(MT_COLOR_NORMAL);
 
  /* build a return code */
  if (!(flags & MUTT_SHOW))
    flags = 0;
 
  rc = flags;
 
out:
  FREE(&buf);
  FREE(&fmt);
  return rc;
}

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