Merge commit 'upstream/1.5.21'

[software/mutt-debian.git] / pager.c

/*
 * Copyright (C) 1996-2002,2007 Michael R. Elkins <me@mutt.org>
 * 
 *     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, write to the Free Software
 *     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */ 

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include "mutt.h"
#include "mutt_curses.h"
#include "mutt_regex.h"
#include "keymap.h"
#include "mutt_menu.h"
#include "mapping.h"
#include "pager.h"
#include "attach.h"
#include "mbyte.h"

#include "mutt_crypt.h"

#include <sys/stat.h>
#include <ctype.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#define ISHEADER(x) ((x) == MT_COLOR_HEADER || (x) == MT_COLOR_HDEFAULT)

#define IsAttach(x) (x && (x)->bdy)
#define IsRecvAttach(x) (x && (x)->bdy && (x)->fp)
#define IsSendAttach(x) (x && (x)->bdy && !(x)->fp)
#define IsMsgAttach(x) (x && (x)->fp && (x)->bdy && (x)->bdy->hdr)
#define IsHeader(x) (x && (x)->hdr && !(x)->bdy)

static const char *Not_available_in_this_menu = N_("Not available in this menu.");
static const char *Mailbox_is_read_only = N_("Mailbox is read-only.");
static const char *Function_not_permitted_in_attach_message_mode = N_("Function not permitted in attach-message mode.");

/* hack to return to position when returning from index to same message */
static int TopLine = 0;
static HEADER *OldHdr = NULL;

#define CHECK_MODE(x)   if (!(x)) \
                        { \
                                mutt_flushinp (); \
                                mutt_error _(Not_available_in_this_menu); \
                                break; \
                        }

#define CHECK_READONLY  if (Context->readonly) \
                        { \
                                mutt_flushinp (); \
                                mutt_error _(Mailbox_is_read_only);     \
                                break; \
                        }

#define CHECK_ATTACH if(option(OPTATTACHMSG)) \
                     {\
                        mutt_flushinp (); \
                        mutt_error _(Function_not_permitted_in_attach_message_mode); \
                        break; \
                     }

#define CHECK_ACL(aclbit,action) \
                if (!mutt_bit_isset(Context->rights,aclbit)) { \
                        mutt_flushinp(); \
                        mutt_error (_("Cannot %s: Operation not permitted by ACL"), action); \
                        break; \
                }

struct q_class_t
{
  int length;
  int index;
  int color;
  char *prefix;
  struct q_class_t *next, *prev;
  struct q_class_t *down, *up;
};

struct syntax_t
{
  int color;
  int first;
  int last;
};

struct line_t
{
  LOFF_T offset;
  short type;
  short continuation;
  short chunks;
  short search_cnt;
  struct syntax_t *syntax;
  struct syntax_t *search;
  struct q_class_t *quote;
  unsigned int is_cont_hdr; /* this line is a continuation of the previous header line */
};

#define ANSI_OFF       (1<<0)
#define ANSI_BLINK     (1<<1)
#define ANSI_BOLD      (1<<2)
#define ANSI_UNDERLINE (1<<3)
#define ANSI_REVERSE   (1<<4)
#define ANSI_COLOR     (1<<5)

typedef struct _ansi_attr {
  int attr;
  int fg;
  int bg;
  int pair;
} ansi_attr;

static short InHelp = 0;

#if defined (USE_SLANG_CURSES) || defined (HAVE_RESIZETERM)
static struct resize {
  int line;
  int SearchCompiled;
  int SearchBack;
} *Resize = NULL;
#endif

#define NumSigLines 4

static int check_sig (const char *s, struct line_t *info, int n)
{
  int count = 0;

  while (n > 0 && count <= NumSigLines)
  {
    if (info[n].type != MT_COLOR_SIGNATURE)
      break;
    count++;
    n--;
  }

  if (count == 0)
    return (-1);

  if (count > NumSigLines)
  {
    /* check for a blank line */
    while (*s)
    {
      if (!ISSPACE (*s))
        return 0;
      s++;
    }

    return (-1);
  }

  return (0);
}

static void
resolve_color (struct line_t *lineInfo, int n, int cnt, int flags, int special,
    ansi_attr *a)
{
  int def_color;                /* color without syntax hilight */
  int color;                    /* final color */
  static int last_color;        /* last color set */
  int search = 0, i, m;

  if (!cnt)
    last_color = -1;            /* force attrset() */

  if (lineInfo[n].continuation)
  {
    if (!cnt && option (OPTMARKERS))
    {
      SETCOLOR (MT_COLOR_MARKERS);
      addch ('+');
      last_color = ColorDefs[MT_COLOR_MARKERS];
    }
    m = (lineInfo[n].syntax)[0].first;
    cnt += (lineInfo[n].syntax)[0].last;
  }
  else
    m = n;
  if (!(flags & M_SHOWCOLOR))
    def_color = ColorDefs[MT_COLOR_NORMAL];
  else if (lineInfo[m].type == MT_COLOR_HEADER)
    def_color = (lineInfo[m].syntax)[0].color;
  else
    def_color = ColorDefs[lineInfo[m].type];

  if ((flags & M_SHOWCOLOR) && lineInfo[m].type == MT_COLOR_QUOTED)
  {
    struct q_class_t *class = lineInfo[m].quote;

    if (class)
    {
      def_color = class->color;

      while (class && class->length > cnt)
      {
        def_color = class->color;
        class = class->up;
      }
    }
  }

  color = def_color;
  if (flags & M_SHOWCOLOR)
  {
    for (i = 0; i < lineInfo[m].chunks; i++)
    {
      /* we assume the chunks are sorted */
      if (cnt > (lineInfo[m].syntax)[i].last)
        continue;
      if (cnt < (lineInfo[m].syntax)[i].first)
        break;
      if (cnt != (lineInfo[m].syntax)[i].last)
      {
        color = (lineInfo[m].syntax)[i].color;
        break;
      }
      /* don't break here, as cnt might be 
       * in the next chunk as well */
    }
  }

  if (flags & M_SEARCH)
  {
    for (i = 0; i < lineInfo[m].search_cnt; i++)
    {
      if (cnt > (lineInfo[m].search)[i].last)
        continue;
      if (cnt < (lineInfo[m].search)[i].first)
        break;
      if (cnt != (lineInfo[m].search)[i].last)
      {
        color = ColorDefs[MT_COLOR_SEARCH];
        search = 1;
        break;
      }
    }
  }

  /* handle "special" bold & underlined characters */
  if (special || a->attr)
  {
#ifdef HAVE_COLOR
    if ((a->attr & ANSI_COLOR))
    {
      if (a->pair == -1)
        a->pair = mutt_alloc_color (a->fg, a->bg);
      color = a->pair;
      if (a->attr & ANSI_BOLD)
          color |= A_BOLD;
    }
    else
#endif
      if ((special & A_BOLD) || (a->attr & ANSI_BOLD))
    {
      if (ColorDefs[MT_COLOR_BOLD] && !search)
        color = ColorDefs[MT_COLOR_BOLD];
      else
        color ^= A_BOLD;
    }
    if ((special & A_UNDERLINE) || (a->attr & ANSI_UNDERLINE))
    {
      if (ColorDefs[MT_COLOR_UNDERLINE] && !search)
        color = ColorDefs[MT_COLOR_UNDERLINE];
      else
        color ^= A_UNDERLINE;
    }
    else if (a->attr & ANSI_REVERSE) 
    {
      color ^= A_REVERSE;
    }
    else if (a->attr & ANSI_BLINK) 
    {
      color ^= A_BLINK;
    }
    else if (a->attr & ANSI_OFF)
    {
      a->attr = 0;
    }
  }

  if (color != last_color)
  {
    attrset (color);
    last_color = color;
  }
}

static void
append_line (struct line_t *lineInfo, int n, int cnt)
{
  int m;

  lineInfo[n+1].type = lineInfo[n].type;
  (lineInfo[n+1].syntax)[0].color = (lineInfo[n].syntax)[0].color;
  lineInfo[n+1].continuation = 1;

  /* find the real start of the line */
  for (m = n; m >= 0; m--)
    if (lineInfo[m].continuation == 0) break;

  (lineInfo[n+1].syntax)[0].first = m;
  (lineInfo[n+1].syntax)[0].last = (lineInfo[n].continuation) ? 
    cnt + (lineInfo[n].syntax)[0].last : cnt;
}

static void
new_class_color (struct q_class_t *class, int *q_level)
{
  class->index = (*q_level)++;
  class->color = ColorQuote[class->index % ColorQuoteUsed];
}

static void
shift_class_colors (struct q_class_t *QuoteList, struct q_class_t *new_class,
                      int index, int *q_level)
{
  struct q_class_t * q_list;

  q_list = QuoteList;
  new_class->index = -1;

  while (q_list)
  {
    if (q_list->index >= index)
    {
      q_list->index++;
      q_list->color = ColorQuote[q_list->index % ColorQuoteUsed];
    }
    if (q_list->down)
      q_list = q_list->down;
    else if (q_list->next)
      q_list = q_list->next;
    else
    {
      while (!q_list->next)
      {
        q_list = q_list->up;
        if (q_list == NULL)
          break;
      }
      if (q_list)
        q_list = q_list->next;
    }
  }

  new_class->index = index;
  new_class->color = ColorQuote[index % ColorQuoteUsed];
  (*q_level)++;
}

static void
cleanup_quote (struct q_class_t **QuoteList)
{
  struct q_class_t *ptr;

  while (*QuoteList)
  {
    if ((*QuoteList)->down)
      cleanup_quote (&((*QuoteList)->down));
    ptr = (*QuoteList)->next;
    if ((*QuoteList)->prefix)
      FREE (&(*QuoteList)->prefix);
    FREE (QuoteList);           /* __FREE_CHECKED__ */
    *QuoteList = ptr;
  }

  return;
}

static struct q_class_t *
classify_quote (struct q_class_t **QuoteList, const char *qptr,
                int length, int *force_redraw, int *q_level)
{
  struct q_class_t *q_list = *QuoteList;
  struct q_class_t *class = NULL, *tmp = NULL, *ptr, *save;
  char *tail_qptr;
  int offset, tail_lng;
  int index = -1;

  if (ColorQuoteUsed <= 1)
  {
    /* not much point in classifying quotes... */

    if (*QuoteList == NULL)
    {
      class = (struct q_class_t *) safe_calloc (1, sizeof (struct q_class_t));
      class->color = ColorQuote[0];
      *QuoteList = class;
    }
    return (*QuoteList);
  }

  /* Did I mention how much I like emulating Lisp in C? */

  /* classify quoting prefix */
  while (q_list)
  {
    if (length <= q_list->length)
    {
      /* case 1: check the top level nodes */

      if (mutt_strncmp (qptr, q_list->prefix, length) == 0)
      {
        if (length == q_list->length)
          return q_list;        /* same prefix: return the current class */

        /* found shorter prefix */
        if (tmp == NULL)
        {
          /* add a node above q_list */
          tmp = (struct q_class_t *) safe_calloc (1, sizeof (struct q_class_t));
          tmp->prefix = (char *) safe_calloc (1, length + 1);
          strncpy (tmp->prefix, qptr, length);
          tmp->length = length;

          /* replace q_list by tmp in the top level list */
          if (q_list->next)
          {
            tmp->next = q_list->next;
            q_list->next->prev = tmp;
          }
          if (q_list->prev)
          {
            tmp->prev = q_list->prev;
            q_list->prev->next = tmp;
          }

          /* make q_list a child of tmp */
          tmp->down = q_list;
          q_list->up = tmp;

          /* q_list has no siblings for now */
          q_list->next = NULL;
          q_list->prev = NULL;

          /* update the root if necessary */
          if (q_list == *QuoteList)
            *QuoteList = tmp;

          index = q_list->index;

          /* tmp should be the return class too */
          class = tmp;

          /* next class to test; if tmp is a shorter prefix for another
           * node, that node can only be in the top level list, so don't
           * go down after this point
           */
          q_list = tmp->next;
        }
        else
        {
          /* found another branch for which tmp is a shorter prefix */

          /* save the next sibling for later */
          save = q_list->next;

          /* unlink q_list from the top level list */
          if (q_list->next)
            q_list->next->prev = q_list->prev;
          if (q_list->prev)
            q_list->prev->next = q_list->next;

          /* at this point, we have a tmp->down; link q_list to it */
          ptr = tmp->down;
          /* sibling order is important here, q_list should be linked last */
          while (ptr->next)
            ptr = ptr->next;
          ptr->next = q_list;
          q_list->next = NULL;
          q_list->prev = ptr;
          q_list->up = tmp;

          index = q_list->index;

          /* next class to test; as above, we shouldn't go down */
          q_list = save;
        }

        /* we found a shorter prefix, so certain quotes have changed classes */
        *force_redraw = 1;
        continue;
      }
      else
      {
        /* shorter, but not a substring of the current class: try next */
        q_list = q_list->next;
        continue;
      }
    }
    else
    {
      /* case 2: try subclassing the current top level node */
      
      /* tmp != NULL means we already found a shorter prefix at case 1 */
      if (tmp == NULL && mutt_strncmp (qptr, q_list->prefix, q_list->length) == 0)
      {
        /* ok, it's a subclass somewhere on this branch */

        ptr = q_list;
        offset = q_list->length;

        q_list = q_list->down;
        tail_lng = length - offset;
        tail_qptr = (char *) qptr + offset;

        while (q_list)
        {
          if (length <= q_list->length)
          {
            if (mutt_strncmp (tail_qptr, (q_list->prefix) + offset, tail_lng) == 0)
            {
              /* same prefix: return the current class */
              if (length == q_list->length)
                return q_list;

              /* found shorter common prefix */
              if (tmp == NULL)
              {
                /* add a node above q_list */
                tmp = (struct q_class_t *) safe_calloc (1, 
                                            sizeof (struct q_class_t));
                tmp->prefix = (char *) safe_calloc (1, length + 1);
                strncpy (tmp->prefix, qptr, length);
                tmp->length = length;
                        
                /* replace q_list by tmp */
                if (q_list->next)
                {
                  tmp->next = q_list->next;
                  q_list->next->prev = tmp;
                }
                if (q_list->prev)
                {
                  tmp->prev = q_list->prev;
                  q_list->prev->next = tmp;
                }

                /* make q_list a child of tmp */
                tmp->down = q_list;
                tmp->up = q_list->up;
                q_list->up = tmp;
                if (tmp->up->down == q_list)
                  tmp->up->down = tmp;

                /* q_list has no siblings */
                q_list->next = NULL;
                q_list->prev = NULL;
                              
                index = q_list->index;

                /* tmp should be the return class too */
                class = tmp;

                /* next class to test */
                q_list = tmp->next;
              }
              else
              {
                /* found another branch for which tmp is a shorter prefix */

                /* save the next sibling for later */
                save = q_list->next;

                /* unlink q_list from the top level list */
                if (q_list->next)
                  q_list->next->prev = q_list->prev;
                if (q_list->prev)
                  q_list->prev->next = q_list->next;

                /* at this point, we have a tmp->down; link q_list to it */
                ptr = tmp->down;
                while (ptr->next)
                  ptr = ptr->next;
                ptr->next = q_list;
                q_list->next = NULL;
                q_list->prev = ptr;
                q_list->up = tmp;

                index = q_list->index;

                /* next class to test */
                q_list = save;
              }

              /* we found a shorter prefix, so we need a redraw */
              *force_redraw = 1;
              continue;
            }
            else
            {
              q_list = q_list->next;
              continue;
            }
          }
          else
          {
            /* longer than the current prefix: try subclassing it */
            if (tmp == NULL && mutt_strncmp (tail_qptr, (q_list->prefix) + offset,
                          q_list->length - offset) == 0)
            {
              /* still a subclass: go down one level */
              ptr = q_list;
              offset = q_list->length;

              q_list = q_list->down;
              tail_lng = length - offset;
              tail_qptr = (char *) qptr + offset;

              continue;
            }
            else
            {
              /* nope, try the next prefix */
              q_list = q_list->next;
              continue;
            }
          }
        }

        /* still not found so far: add it as a sibling to the current node */
        if (class == NULL)
        {
          tmp = (struct q_class_t *) safe_calloc (1, sizeof (struct q_class_t));
          tmp->prefix = (char *) safe_calloc (1, length + 1);
          strncpy (tmp->prefix, qptr, length);
          tmp->length = length;

          if (ptr->down)
          {
            tmp->next = ptr->down;
            ptr->down->prev = tmp;
          }
          ptr->down = tmp;
          tmp->up = ptr;

          new_class_color (tmp, q_level);

          return tmp;
        }
        else
        {
          if (index != -1)
            shift_class_colors (*QuoteList, tmp, index, q_level);

          return class;
        }
      }
      else
      {
        /* nope, try the next prefix */
        q_list = q_list->next;
        continue;
      }
    }
  }

  if (class == NULL)
  {
    /* not found so far: add it as a top level class */
    class = (struct q_class_t *) safe_calloc (1, sizeof (struct q_class_t));
    class->prefix = (char *) safe_calloc (1, length + 1);
    strncpy (class->prefix, qptr, length);
    class->length = length;
    new_class_color (class, q_level);

    if (*QuoteList)
    {
      class->next = *QuoteList;
      (*QuoteList)->prev = class;
    }
    *QuoteList = class;
  }

  if (index != -1)
    shift_class_colors (*QuoteList, tmp, index, q_level);

  return class;
}

static int brailleLine = -1;
static int brailleCol = -1;

static int check_attachment_marker (char *);

static void
resolve_types (char *buf, char *raw, struct line_t *lineInfo, int n, int last,
                struct q_class_t **QuoteList, int *q_level, int *force_redraw,
                int q_classify)
{
  COLOR_LINE *color_line;
  regmatch_t pmatch[1], smatch[1];
  int found, offset, null_rx, i;

  if (n == 0 || ISHEADER (lineInfo[n-1].type))
  {
    if (buf[0] == '\n') /* end of header */
    {
      lineInfo[n].type = MT_COLOR_NORMAL;
      getyx(stdscr, brailleLine, brailleCol);
    }
    else
    {
      /* if this is a continuation of the previous line, use the previous
       * line's color as default. */
      if (n > 0 && (buf[0] == ' ' || buf[0] == '\t'))
      {
        lineInfo[n].type = lineInfo[n-1].type; /* wrapped line */
        (lineInfo[n].syntax)[0].color = (lineInfo[n-1].syntax)[0].color;
        lineInfo[n].is_cont_hdr = 1;
      }
      else
      {
        lineInfo[n].type = MT_COLOR_HDEFAULT;
      }

      for (color_line = ColorHdrList; color_line; color_line = color_line->next)
      {
        if (REGEXEC (color_line->rx, buf) == 0)
        {
          lineInfo[n].type = MT_COLOR_HEADER;
          lineInfo[n].syntax[0].color = color_line->pair;
          if (lineInfo[n].is_cont_hdr)
          {
            /* adjust the previous continuation lines to reflect the color of this continuation line */
            int j;
            for (j = n - 1; j >= 0 && lineInfo[j].is_cont_hdr; --j)
            {
              lineInfo[j].type = lineInfo[n].type;
              lineInfo[j].syntax[0].color = lineInfo[n].syntax[0].color;
            }
            /* now adjust the first line of this header field */
            if (j >= 0)
            {
              lineInfo[j].type = lineInfo[n].type;
              lineInfo[j].syntax[0].color = lineInfo[n].syntax[0].color;
            }
            *force_redraw = 1; /* the previous lines have already been drawn on the screen */
          }
          break;
        }
      }
    }
  }
  else if (mutt_strncmp ("\033[0m", raw, 4) == 0)       /* a little hack... */
    lineInfo[n].type = MT_COLOR_NORMAL;
#if 0
  else if (mutt_strncmp ("[-- ", buf, 4) == 0)
    lineInfo[n].type = MT_COLOR_ATTACHMENT;
#else
  else if (check_attachment_marker ((char *) raw) == 0)
    lineInfo[n].type = MT_COLOR_ATTACHMENT;
#endif
  else if (mutt_strcmp ("-- \n", buf) == 0 || mutt_strcmp ("-- \r\n", buf) == 0)
  {
    i = n + 1;

    lineInfo[n].type = MT_COLOR_SIGNATURE;
    while (i < last && check_sig (buf, lineInfo, i - 1) == 0 &&
           (lineInfo[i].type == MT_COLOR_NORMAL ||
            lineInfo[i].type == MT_COLOR_QUOTED ||
            lineInfo[i].type == MT_COLOR_HEADER))
      {
        /* oops... */
        if (lineInfo[i].chunks)
        {
          lineInfo[i].chunks = 0;
          safe_realloc (&(lineInfo[n].syntax), 
                        sizeof (struct syntax_t));
        }
        lineInfo[i++].type = MT_COLOR_SIGNATURE;
      }
  }
  else if (check_sig (buf, lineInfo, n - 1) == 0)
    lineInfo[n].type = MT_COLOR_SIGNATURE;
  else if (regexec ((regex_t *) QuoteRegexp.rx, buf, 1, pmatch, 0) == 0)
  {
    if (regexec ((regex_t *) Smileys.rx, buf, 1, smatch, 0) == 0)
    {
      if (smatch[0].rm_so > 0)
      {
        char c;

        /* hack to avoid making an extra copy of buf */
        c = buf[smatch[0].rm_so];
        buf[smatch[0].rm_so] = 0;

        if (regexec ((regex_t *) QuoteRegexp.rx, buf, 1, pmatch, 0) == 0)
        {
          if (q_classify && lineInfo[n].quote == NULL)
            lineInfo[n].quote = classify_quote (QuoteList,
                                  buf + pmatch[0].rm_so,
                                  pmatch[0].rm_eo - pmatch[0].rm_so,
                                  force_redraw, q_level);
          lineInfo[n].type = MT_COLOR_QUOTED;
        }
        else
          lineInfo[n].type = MT_COLOR_NORMAL;

        buf[smatch[0].rm_so] = c;
      }
      else
        lineInfo[n].type = MT_COLOR_NORMAL;
    }
    else
    {
      if (q_classify && lineInfo[n].quote == NULL)
        lineInfo[n].quote = classify_quote (QuoteList, buf + pmatch[0].rm_so,
                              pmatch[0].rm_eo - pmatch[0].rm_so,
                              force_redraw, q_level);
      lineInfo[n].type = MT_COLOR_QUOTED;
    }
  }
  else
    lineInfo[n].type = MT_COLOR_NORMAL;

  /* body patterns */
  if (lineInfo[n].type == MT_COLOR_NORMAL || 
      lineInfo[n].type == MT_COLOR_QUOTED)
  {
    size_t nl;

    /* don't consider line endings part of the buffer
     * for regex matching */
    if ((nl = mutt_strlen (buf)) > 0 && buf[nl-1] == '\n')
      buf[nl-1] = 0;

    i = 0;
    offset = 0;
    lineInfo[n].chunks = 0;
    do
    {
      if (!buf[offset])
        break;

      found = 0;
      null_rx = 0;
      color_line = ColorBodyList;
      while (color_line)
      {
        if (regexec (&color_line->rx, buf + offset, 1, pmatch,
                     (offset ? REG_NOTBOL : 0)) == 0)
        {
          if (pmatch[0].rm_eo != pmatch[0].rm_so)
          {
            if (!found)
            {
              if (++(lineInfo[n].chunks) > 1)
                safe_realloc (&(lineInfo[n].syntax), 
                              (lineInfo[n].chunks) * sizeof (struct syntax_t));
            }
            i = lineInfo[n].chunks - 1;
            pmatch[0].rm_so += offset;
            pmatch[0].rm_eo += offset;
            if (!found ||
                pmatch[0].rm_so < (lineInfo[n].syntax)[i].first ||
                (pmatch[0].rm_so == (lineInfo[n].syntax)[i].first &&
                 pmatch[0].rm_eo > (lineInfo[n].syntax)[i].last))
            {
              (lineInfo[n].syntax)[i].color = color_line->pair;
              (lineInfo[n].syntax)[i].first = pmatch[0].rm_so;
              (lineInfo[n].syntax)[i].last = pmatch[0].rm_eo;
            }
            found = 1;
            null_rx = 0;
          }
          else
            null_rx = 1; /* empty regexp; don't add it, but keep looking */
        }
        color_line = color_line->next;
      }

      if (null_rx)
        offset++; /* avoid degenerate cases */
      else
        offset = (lineInfo[n].syntax)[i].last;
    } while (found || null_rx);
    if (nl > 0)
      buf[nl] = '\n';
  }
}

static int is_ansi (unsigned char *buf)
{
  while (*buf && (isdigit(*buf) || *buf == ';'))
    buf++;
  return (*buf == 'm');
}

static int check_attachment_marker (char *p)
{
  char *q = AttachmentMarker;
  
  for (;*p == *q && *q && *p && *q != '\a' && *p != '\a'; p++, q++)
    ;
  return (int) (*p - *q);
}

static int grok_ansi(unsigned char *buf, int pos, ansi_attr *a)
{
  int x = pos;

  while (isdigit(buf[x]) || buf[x] == ';')
    x++;

  /* Character Attributes */
  if (option (OPTALLOWANSI) && a != NULL && buf[x] == 'm')
  {
    if (pos == x)
    {
#ifdef HAVE_COLOR
      if (a->pair != -1)
        mutt_free_color (a->fg, a->bg);
#endif
      a->attr = ANSI_OFF;
      a->pair = -1;
    }
    while (pos < x)
    {
      if (buf[pos] == '1' && (pos+1 == x || buf[pos+1] == ';'))
      {
        a->attr |= ANSI_BOLD;
        pos += 2;
      } 
      else if (buf[pos] == '4' && (pos+1 == x || buf[pos+1] == ';'))
      {
        a->attr |= ANSI_UNDERLINE;
        pos += 2;
      }
      else if (buf[pos] == '5' && (pos+1 == x || buf[pos+1] == ';'))
      {
        a->attr |= ANSI_BLINK;
        pos += 2;
      }
      else if (buf[pos] == '7' && (pos+1 == x || buf[pos+1] == ';'))
      {
        a->attr |= ANSI_REVERSE;
        pos += 2;
      }
      else if (buf[pos] == '0' && (pos+1 == x || buf[pos+1] == ';'))
      {
#ifdef HAVE_COLOR
        if (a->pair != -1)
          mutt_free_color(a->fg,a->bg);
#endif
        a->attr = ANSI_OFF;
        a->pair = -1;
        pos += 2;
      }
      else if (buf[pos] == '3' && isdigit(buf[pos+1]))
      {
#ifdef HAVE_COLOR
        if (a->pair != -1)
          mutt_free_color(a->fg,a->bg);
#endif
        a->pair = -1;
        a->attr |= ANSI_COLOR;
        a->fg = buf[pos+1] - '0';
        pos += 3;
      }
      else if (buf[pos] == '4' && isdigit(buf[pos+1]))
      {
#ifdef HAVE_COLOR
        if (a->pair != -1)
          mutt_free_color(a->fg,a->bg);
#endif
        a->pair = -1;
        a->attr |= ANSI_COLOR;
        a->bg = buf[pos+1] - '0';
        pos += 3;
      }
      else 
      {
        while (pos < x && buf[pos] != ';') pos++;
        pos++;
      }
    }
  }
  pos = x;
  return pos;
}

/* trim tail of buf so that it contains complete multibyte characters */
static int
trim_incomplete_mbyte(unsigned char *buf, size_t len)
{
  mbstate_t mbstate;
  size_t k;

  memset (&mbstate, 0, sizeof (mbstate));
  for (; len > 0; buf += k, len -= k)
  {
    k = mbrtowc (NULL, (char *) buf, len, &mbstate);
    if (k == -2) 
      break; 
    else if (k == -1 || k == 0) 
      k = 1;
  }
  *buf = '\0';

  return len;
}

static int
fill_buffer (FILE *f, LOFF_T *last_pos, LOFF_T offset, unsigned char **buf,
             unsigned char **fmt, size_t *blen, int *buf_ready)
{
  unsigned char *p, *q;
  static int b_read;
  int l;

  if (*buf_ready == 0)
  {
    if (offset != *last_pos)
      fseeko (f, offset, 0);
    if ((*buf = (unsigned char *) mutt_read_line ((char *) *buf, blen, f, &l, M_EOL)) == NULL)
    {
      fmt[0] = 0;
      return (-1);
    }
    *last_pos = ftello (f);
    b_read = (int) (*last_pos - offset);
    *buf_ready = 1;

    safe_realloc (fmt, *blen);

    /* incomplete mbyte characters trigger a segfault in regex processing for
     * certain versions of glibc. Trim them if necessary. */
    if (b_read == *blen - 2)
      b_read -= trim_incomplete_mbyte(*buf, b_read);
    
    /* copy "buf" to "fmt", but without bold and underline controls */
    p = *buf;
    q = *fmt;
    while (*p)
    {
      if (*p == '\010' && (p > *buf))
      {
        if (*(p+1) == '_')      /* underline */
          p += 2;
        else if (*(p+1) && q > *fmt)    /* bold or overstrike */
        {
          *(q-1) = *(p+1);
          p += 2;
        }
        else                    /* ^H */
          *q++ = *p++;
      }
      else if (*p == '\033' && *(p+1) == '[' && is_ansi (p + 2))
      {
        while (*p++ != 'm')     /* skip ANSI sequence */
          ;
      }
      else if (*p == '\033' && *(p+1) == ']' && check_attachment_marker ((char *) p) == 0)
      {
        dprint (2, (debugfile, "fill_buffer: Seen attachment marker.\n"));
        while (*p++ != '\a')    /* skip pseudo-ANSI sequence */
          ;
      }
      else
        *q++ = *p++;
    }
    *q = 0;
  }
  return b_read;
}


static int format_line (struct line_t **lineInfo, int n, unsigned char *buf,
                        int flags, ansi_attr *pa, int cnt,
                        int *pspace, int *pvch, int *pcol, int *pspecial)
{
  int space = -1; /* index of the last space or TAB */
  int col = option (OPTMARKERS) ? (*lineInfo)[n].continuation : 0;
  int ch, vch, k, last_special = -1, special = 0, t;
  wchar_t wc;
  mbstate_t mbstate;
  int wrap_cols = mutt_term_width ((flags & M_PAGER_NOWRAP) ? 0 : Wrap);

  if (check_attachment_marker ((char *)buf) == 0)
    wrap_cols = COLS;

  /* FIXME: this should come from lineInfo */
  memset(&mbstate, 0, sizeof(mbstate));

  for (ch = 0, vch = 0; ch < cnt; ch += k, vch += k)
  {
    /* Handle ANSI sequences */
    while (cnt-ch >= 2 && buf[ch] == '\033' && buf[ch+1] == '[' &&
           is_ansi (buf+ch+2))
      ch = grok_ansi (buf, ch+2, pa) + 1;

    while (cnt-ch >= 2 && buf[ch] == '\033' && buf[ch+1] == ']' &&
           check_attachment_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 == -2 || k == -1)
    {
      dprint (1, (debugfile, "%s:%d: mbrtowc returned %d; errno = %d.\n",
                  __FILE__, __LINE__, k, errno));
      if (col + 4 > wrap_cols)
        break;
      col += 4;
      if (pa)
        printw ("\\%03o", buf[ch]);
      k = 1;
      continue;
    }
    if (k == 0)
      k = 1;

    if (Charset_is_utf8 && (wc == 0x200B || wc == 0xFEFF))
    {
        dprint (3, (debugfile, "skip zero-width character U+%04X\n", (unsigned short)wc));
        continue;
    }

    /* Handle backspace */
    special = 0;
    if (IsWPrint (wc))
    {
      wchar_t wc1;
      mbstate_t mbstate1;
      int k1, k2;

      while ((wc1 = 0, mbstate1 = mbstate,
              k1 = k + mbrtowc (&wc1, (char *)buf+ch+k, cnt-ch-k, &mbstate1),
              k1 - k > 0 && wc1 == '\b') &&
             (wc1 = 0,
              k2 = mbrtowc (&wc1, (char *)buf+ch+k1, cnt-ch-k1, &mbstate1),
              k2 > 0 && IsWPrint (wc1)))
      {
        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 += k1;
        k = k2;
        mbstate = mbstate1;
      }
    }

    if (pa &&
        ((flags & (M_SHOWCOLOR | M_SEARCH | M_PAGER_MARKER)) ||
         special || last_special || pa->attr))
    {
      resolve_color (*lineInfo, n, vch, flags, special, pa);
      last_special = special;
    }

    if (IsWPrint (wc))
    {
      if (wc == ' ')
        space = ch;
      t = wcwidth (wc);
      if (col + t > wrap_cols)
        break;
      col += t;
      if (pa)
        mutt_addwch (wc);
    }
    else if (wc == '\n')
      break;
    else if (wc == '\t')
    {
      space = ch;
      t = (col & ~7) + 8;
      if (t > wrap_cols)
        break;
      if (pa)
        for (; col < t; col++)
          addch (' ');
      else
        col = t;
    }
    else if (wc < 0x20 || wc == 0x7f)
    {
      if (col + 2 > wrap_cols)
        break;
      col += 2;
      if (pa)
        printw ("^%c", ('@' + wc) & 0x7f);
    }
    else if (wc < 0x100)
    {
      if (col + 4 > wrap_cols)
        break;
      col += 4;
      if (pa)
        printw ("\\%03o", wc);
    }
    else
    {
      if (col + 1 > wrap_cols)
        break;
      ++col;
      if (pa)
        addch (replacement_char ());
    }
  }
  *pspace = space;
  *pcol = col;
  *pvch = vch;
  *pspecial = special;
  return ch;
}

/*
 * Args:
 *      flags   M_SHOWFLAT, show characters (used for displaying help)
 *              M_SHOWCOLOR, show characters in color
 *                      otherwise don't show characters
 *              M_HIDE, don't show quoted text
 *              M_SEARCH, resolve search patterns
 *              M_TYPES, compute line's type
 *              M_PAGER_NSKIP, keeps leading whitespace
 *              M_PAGER_MARKER, eventually show markers
 *
 * Return values:
 *      -1      EOF was reached
 *      0       normal exit, line was not displayed
 *      >0      normal exit, line was displayed
 */

static int
display_line (FILE *f, LOFF_T *last_pos, struct line_t **lineInfo, int n, 
              int *last, int *max, int flags, struct q_class_t **QuoteList,
              int *q_level, int *force_redraw, regex_t *SearchRE)
{
  unsigned char *buf = NULL, *fmt = NULL;
  size_t buflen = 0;
  unsigned char *buf_ptr = buf;
  int ch, vch, col, cnt, b_read;
  int buf_ready = 0, change_last = 0;
  int special;
  int offset;
  int def_color;
  int m;
  int rc = -1;
  ansi_attr a = {0,0,0,-1};
  regmatch_t pmatch[1];

  if (n == *last)
  {
    (*last)++;
    change_last = 1;
  }

  if (*last == *max)
  {
    safe_realloc (lineInfo, sizeof (struct line_t) * (*max += LINES));
    for (ch = *last; ch < *max ; ch++)
    {
      memset (&((*lineInfo)[ch]), 0, sizeof (struct line_t));
      (*lineInfo)[ch].type = -1;
      (*lineInfo)[ch].search_cnt = -1;
      (*lineInfo)[ch].syntax = safe_malloc (sizeof (struct syntax_t));
      ((*lineInfo)[ch].syntax)[0].first = ((*lineInfo)[ch].syntax)[0].last = -1;
    }
  }

  /* only do color hiliting if we are viewing a message */
  if (flags & (M_SHOWCOLOR | M_TYPES))
  {
    if ((*lineInfo)[n].type == -1)
    {
      /* determine the line class */
      if (fill_buffer (f, last_pos, (*lineInfo)[n].offset, &buf, &fmt, &buflen, &buf_ready) < 0)
      {
        if (change_last)
          (*last)--;
        goto out;
      }

      resolve_types ((char *) fmt, (char *) buf, *lineInfo, n, *last,
                      QuoteList, q_level, force_redraw, flags & M_SHOWCOLOR);

      /* avoid race condition for continuation lines when scrolling up */
      for (m = n + 1; m < *last && (*lineInfo)[m].offset && (*lineInfo)[m].continuation; m++)
        (*lineInfo)[m].type = (*lineInfo)[n].type;
    }

    /* this also prevents searching through the hidden lines */
    if ((flags & M_HIDE) && (*lineInfo)[n].type == MT_COLOR_QUOTED)
      flags = 0; /* M_NOSHOW */
  }

  /* At this point, (*lineInfo[n]).quote may still be undefined. We 
   * don't want to compute it every time M_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 & M_SHOWCOLOR) && !(*lineInfo)[n].continuation &&
      (*lineInfo)[n].type == MT_COLOR_QUOTED && (*lineInfo)[n].quote == NULL)
  {
    if (fill_buffer (f, last_pos, (*lineInfo)[n].offset, &buf, &fmt, &buflen, &buf_ready) < 0)
    {
      if (change_last)
        (*last)--;
      goto out;
    }
    regexec ((regex_t *) QuoteRegexp.rx, (char *) fmt, 1, pmatch, 0);
    (*lineInfo)[n].quote = classify_quote (QuoteList,
                            (char *) fmt + pmatch[0].rm_so,
                            pmatch[0].rm_eo - pmatch[0].rm_so,
                            force_redraw, q_level);
  }

  if ((flags & M_SEARCH) && !(*lineInfo)[n].continuation && (*lineInfo)[n].search_cnt == -1) 
  {
    if (fill_buffer (f, last_pos, (*lineInfo)[n].offset, &buf, &fmt, &buflen, &buf_ready) < 0)
    {
      if (change_last)
        (*last)--;
      goto out;
    }

    offset = 0;
    (*lineInfo)[n].search_cnt = 0;
    while (regexec (SearchRE, (char *) fmt + offset, 1, pmatch, (offset ? REG_NOTBOL : 0)) == 0)
    {
      if (++((*lineInfo)[n].search_cnt) > 1)
        safe_realloc (&((*lineInfo)[n].search),
                      ((*lineInfo)[n].search_cnt) * sizeof (struct syntax_t));
      else
        (*lineInfo)[n].search = safe_malloc (sizeof (struct syntax_t));
      pmatch[0].rm_so += offset;
      pmatch[0].rm_eo += offset;
      ((*lineInfo)[n].search)[(*lineInfo)[n].search_cnt - 1].first = pmatch[0].rm_so;
      ((*lineInfo)[n].search)[(*lineInfo)[n].search_cnt - 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 & M_SHOW) && (*lineInfo)[n+1].offset > 0)
  {
    /* we've already scanned this line, so just exit */
    rc = 0;
    goto out;
  }
  if ((flags & M_SHOWCOLOR) && *force_redraw && (*lineInfo)[n+1].offset > 0)
  {
    /* no need to try to display this line... */
    rc = 1;
    goto out; /* fake display */
  }

  if ((b_read = fill_buffer (f, last_pos, (*lineInfo)[n].offset, &buf, &fmt, 
                             &buflen, &buf_ready)) < 0)
  {
    if (change_last)
      (*last)--;
    goto out;
  }

  /* now chose a good place to break the line */
  cnt = format_line (lineInfo, n, buf, flags, 0, b_read, &ch, &vch, &col, &special);
  buf_ptr = buf + cnt;

  /* move the break point only if smart_wrap is set */
  if (option (OPTWRAP))
  {
    if (cnt < b_read)
    {
      if (ch != -1 && buf[0] != ' ' && buf[0] != '\t' &&
          buf[cnt] != ' ' && buf[cnt] != '\t' && buf[cnt] != '\n' && buf[cnt] != '\r')
      {
        buf_ptr = buf + ch;
        /* skip trailing blanks */
        while (ch && (buf[ch] == ' ' || buf[ch] == '\t' || buf[ch] == '\r'))
          ch--;
        /* a very long word with leading spaces causes infinite wrapping */
        if ((!ch) && (flags & M_PAGER_NSKIP))
          buf_ptr = buf + cnt;
        else
          cnt = ch + 1;
      }
      else
        buf_ptr = buf + cnt; /* a very long word... */
    }
    if (!(flags & M_PAGER_NSKIP))
      /* 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 && !(*lineInfo)[n+1].continuation)
    append_line (*lineInfo, n, (int) (buf_ptr - buf));
  (*lineInfo)[n+1].offset = (*lineInfo)[n].offset + (long) (buf_ptr - buf);

  /* if we don't need to display the line we are done */
  if (!(flags & M_SHOW))
  {
    rc = 0;
    goto out;
  }

  /* display the line */
  format_line (lineInfo, n, buf, flags, &a, cnt, &ch, &vch, &col, &special);

  /* avoid a bug in ncurses... */
#ifndef USE_SLANG_CURSES
  if (col == 0)
  {
    SETCOLOR (MT_COLOR_NORMAL);
    addch (' ');
  }
#endif

  /* end the last color pattern (needed by S-Lang) */
  if (special || (col != COLS && (flags & (M_SHOWCOLOR | M_SEARCH))))
    resolve_color (*lineInfo, n, vch, flags, 0, &a);
          
  /*
   * Fill the blank space at the end of the line with the prevailing color.
   * ncurses does an implicit clrtoeol() when you do addch('\n') so we have
   * to make sure to reset the color *after* that
   */
  if (flags & M_SHOWCOLOR)
  {
    m = ((*lineInfo)[n].continuation) ? ((*lineInfo)[n].syntax)[0].first : n;
    if ((*lineInfo)[m].type == MT_COLOR_HEADER)
      def_color = ((*lineInfo)[m].syntax)[0].color;
    else
      def_color = ColorDefs[ (*lineInfo)[m].type ];

    attrset (def_color);
#ifdef HAVE_BKGDSET
    bkgdset (def_color | ' ');
#endif
  }

  /* ncurses always wraps lines when you get to the right side of the
   * screen, but S-Lang seems to only wrap if the next character is *not*
   * a newline (grr!).
   */
#ifndef USE_SLANG_CURSES
    if (col < COLS)
#endif
      addch ('\n');

  /*
   * reset the color back to normal.  This *must* come after the
   * addch('\n'), otherwise the color for this line will not be
   * filled to the right margin.
   */
  if (flags & M_SHOWCOLOR)
  {
    SETCOLOR(MT_COLOR_NORMAL);
    BKGDSET(MT_COLOR_NORMAL);
  }

  /* build a return code */
  if (!(flags & M_SHOW))
    flags = 0;

  rc = flags;

out:
  FREE(&buf);
  FREE(&fmt);
  return rc;
}

static int
upNLines (int nlines, struct line_t *info, int cur, int hiding)
{
  while (cur > 0 && nlines > 0)
  {
    cur--;
    if (!hiding || info[cur].type != MT_COLOR_QUOTED)
      nlines--;
  }

  return cur;
}

static struct mapping_t PagerHelp[] = {
  { N_("Exit"), OP_EXIT },
  { N_("PrevPg"), OP_PREV_PAGE },
  { N_("NextPg"), OP_NEXT_PAGE },
  { NULL,       0 }
};
static struct mapping_t PagerHelpExtra[] = {
  { N_("View Attachm."), OP_VIEW_ATTACHMENTS },
  { N_("Del"), OP_DELETE },
  { N_("Reply"), OP_REPLY },
  { N_("Next"), OP_MAIN_NEXT_UNDELETED },
  { NULL,       0 }
};



/* This pager is actually not so simple as it once was.  It now operates in
   two modes: one for viewing messages and the other for viewing help.  These
   can be distinguished by whether or not ``hdr'' is NULL.  The ``hdr'' arg
   is there so that we can do operations on the current message without the
   need to pop back out to the main-menu.  */
int 
mutt_pager (const char *banner, const char *fname, int flags, pager_t *extra)
{
  static char searchbuf[STRING] = "";
  char buffer[LONG_STRING];
  char helpstr[SHORT_STRING*2];
  char tmphelp[SHORT_STRING*2];
  int maxLine, lastLine = 0;
  struct line_t *lineInfo;
  struct q_class_t *QuoteList = NULL;
  int i, j, ch = 0, rc = -1, hideQuoted = 0, q_level = 0, force_redraw = 0;
  int lines = 0, curline = 0, topline = 0, oldtopline = 0, err, first = 1;
  int r = -1, wrapped = 0, searchctx = 0;
  int redraw = REDRAW_FULL;
  FILE *fp = NULL;
  LOFF_T last_pos = 0, last_offset = 0;
  int old_smart_wrap, old_markers;
  struct stat sb;
  regex_t SearchRE;
  int SearchCompiled = 0, SearchFlag = 0, SearchBack = 0;
  int has_types = (IsHeader(extra) || (flags & M_SHOWCOLOR)) ? M_TYPES : 0; /* main message or rfc822 attachment */

  int bodyoffset = 1;                   /* offset of first line of real text */
  int statusoffset = 0;                 /* offset for the status bar */
  int helpoffset = LINES - 2;           /* offset for the help bar. */
  int bodylen = LINES - 2 - bodyoffset; /* length of displayable area */

  MUTTMENU *index = NULL;               /* the Pager Index (PI) */
  int indexoffset = 0;                  /* offset for the PI */
  int indexlen = PagerIndexLines;       /* indexlen not always == PIL */
  int indicator = indexlen / 3;         /* the indicator line of the PI */
  int old_PagerIndexLines;              /* some people want to resize it
                                         * while inside the pager... */

  if (!(flags & M_SHOWCOLOR))
    flags |= M_SHOWFLAT;

  if ((fp = fopen (fname, "r")) == NULL)
  {
    mutt_perror (fname);
    return (-1);
  }

  if (stat (fname, &sb) != 0)
  {
    mutt_perror (fname);
    safe_fclose (&fp);
    return (-1);
  }
  unlink (fname);

  /* Initialize variables */

  if (IsHeader (extra) && !extra->hdr->read)
  {
    Context->msgnotreadyet = extra->hdr->msgno;
    mutt_set_flag (Context, extra->hdr, M_READ, 1);
  }

  lineInfo = safe_malloc (sizeof (struct line_t) * (maxLine = LINES));
  for (i = 0 ; i < maxLine ; i++)
  {
    memset (&lineInfo[i], 0, sizeof (struct line_t));
    lineInfo[i].type = -1;
    lineInfo[i].search_cnt = -1;
    lineInfo[i].syntax = safe_malloc (sizeof (struct syntax_t));
    (lineInfo[i].syntax)[0].first = (lineInfo[i].syntax)[0].last = -1;
  }

  mutt_compile_help (helpstr, sizeof (helpstr), MENU_PAGER, PagerHelp);
  if (IsHeader (extra))
  {
    strfcpy (tmphelp, helpstr, sizeof (tmphelp));
    mutt_compile_help (buffer, sizeof (buffer), MENU_PAGER, PagerHelpExtra);
    snprintf (helpstr, sizeof (helpstr), "%s %s", tmphelp, buffer);
  }
  if (!InHelp)
  {
    strfcpy (tmphelp, helpstr, sizeof (tmphelp));
    mutt_make_help (buffer, sizeof (buffer), _("Help"), MENU_PAGER, OP_HELP);
    snprintf (helpstr, sizeof (helpstr), "%s %s", tmphelp, buffer);
  }

  while (ch != -1)
  {
    mutt_curs_set (0);

    if (redraw & REDRAW_FULL)
    {
      SETCOLOR (MT_COLOR_NORMAL);
      /* clear() doesn't optimize screen redraws */
      move (0, 0);
      clrtobot ();

      if (IsHeader (extra) && Context->vcount + 1 < PagerIndexLines)
        indexlen = Context->vcount + 1;
      else
        indexlen = PagerIndexLines;

      indicator = indexlen / 3;

      if (option (OPTSTATUSONTOP))
      {
        indexoffset = 0;
        statusoffset = IsHeader (extra) ? indexlen : 0;
        bodyoffset = statusoffset + 1;
        helpoffset = LINES - 2;
        bodylen = helpoffset - bodyoffset;
        if (!option (OPTHELP))
          bodylen++;
      }
      else
      {
        helpoffset = 0;
        indexoffset = 1;
        statusoffset = LINES - 2;
        if (!option (OPTHELP))
          indexoffset = 0;
        bodyoffset = indexoffset + (IsHeader (extra) ? indexlen : 0);
        bodylen = statusoffset - bodyoffset;
      }

      if (option (OPTHELP))
      {
        SETCOLOR (MT_COLOR_STATUS);
        move (helpoffset, 0);
        mutt_paddstr (COLS, helpstr);
        SETCOLOR (MT_COLOR_NORMAL);
      }

#if defined (USE_SLANG_CURSES) || defined (HAVE_RESIZETERM)
      if (Resize != NULL)
      {
        if ((SearchCompiled = Resize->SearchCompiled))
        {
          REGCOMP
            (&SearchRE, searchbuf, REG_NEWLINE | mutt_which_case (searchbuf));
          SearchFlag = M_SEARCH;
          SearchBack = Resize->SearchBack;
        }
        lines = Resize->line;
        redraw |= REDRAW_SIGWINCH;

        FREE (&Resize);
      }
#endif

      if (IsHeader (extra) && PagerIndexLines)
      {
        if (index == NULL)
        {
          /* only allocate the space if/when we need the index.
             Initialise the menu as per the main index */
          index = mutt_new_menu(MENU_MAIN);
          index->make_entry = index_make_entry;
          index->color = index_color;
          index->max = Context->vcount;
          index->current = extra->hdr->virtual;
        }

        SETCOLOR (MT_COLOR_NORMAL);
        index->offset  = indexoffset + (option (OPTSTATUSONTOP) ? 1 : 0);

        index->pagelen = indexlen - 1;

        /* some fudge to work out where abouts the indicator should go */
        if (index->current - indicator < 0)
          index->top = 0;
        else if (index->max - index->current < index->pagelen - indicator)
          index->top = index->max - index->pagelen;
        else
          index->top = index->current - indicator;

        menu_redraw_index(index);
      }

      redraw |= REDRAW_BODY | REDRAW_INDEX | REDRAW_STATUS;
      mutt_show_error ();
    }

    if (redraw & REDRAW_SIGWINCH)
    {
      i = -1;
      j = -1;
      while (display_line (fp, &last_pos, &lineInfo, ++i, &lastLine, &maxLine,
             has_types | SearchFlag | (flags & M_PAGER_NOWRAP), &QuoteList, &q_level, &force_redraw,
             &SearchRE) == 0)
        if (!lineInfo[i].continuation && ++j == lines)
        {
          topline = i;
          if (!SearchFlag)
            break;
        }
    }

    if ((redraw & REDRAW_BODY) || topline != oldtopline)
    {
      do {
        move (bodyoffset, 0);
        curline = oldtopline = topline;
        lines = 0;
        force_redraw = 0;

        while (lines < bodylen && lineInfo[curline].offset <= sb.st_size - 1)
        {
          if (display_line (fp, &last_pos, &lineInfo, curline, &lastLine, 
                            &maxLine,
                            (flags & M_DISPLAYFLAGS) | hideQuoted | SearchFlag | (flags & M_PAGER_NOWRAP),
                            &QuoteList, &q_level, &force_redraw, &SearchRE) > 0)
            lines++;
          curline++;
        }
        last_offset = lineInfo[curline].offset;
      } while (force_redraw);

      SETCOLOR (MT_COLOR_TILDE);
      BKGDSET (MT_COLOR_TILDE);
      while (lines < bodylen)
      {
        clrtoeol ();
        if (option (OPTTILDE))
          addch ('~');
        addch ('\n');
        lines++;
      }
      /* We are going to update the pager status bar, so it isn't
       * necessary to reset to normal color now. */

      redraw |= REDRAW_STATUS; /* need to update the % seen */
    }

    if (redraw & REDRAW_STATUS)
    {
      struct hdr_format_info hfi;
      char pager_progress_str[4];

      hfi.ctx = Context;
      hfi.pager_progress = pager_progress_str;

      if (last_pos < sb.st_size - 1)
        snprintf(pager_progress_str, sizeof(pager_progress_str), OFF_T_FMT "%%", (100 * last_offset / sb.st_size));
      else
        strfcpy(pager_progress_str, (topline == 0) ? "all" : "end", sizeof(pager_progress_str));

      /* print out the pager status bar */
      SETCOLOR (MT_COLOR_STATUS);
      BKGDSET (MT_COLOR_STATUS);
      CLEARLINE (statusoffset);

      if (IsHeader (extra) || IsMsgAttach (extra))
      {
        size_t l1 = COLS * MB_LEN_MAX;
        size_t l2 = sizeof (buffer);
        hfi.hdr = (IsHeader (extra)) ? extra->hdr : extra->bdy->hdr;
        mutt_make_string_info (buffer, l1 < l2 ? l1 : l2, NONULL (PagerFmt), &hfi, M_FORMAT_MAKEPRINT);
        mutt_paddstr (COLS, buffer);
      }
      else
      {
        char bn[STRING];
        snprintf (bn, sizeof (bn), "%s (%s)", banner, pager_progress_str);
        mutt_paddstr (COLS, bn);
      }
      BKGDSET (MT_COLOR_NORMAL);
      SETCOLOR (MT_COLOR_NORMAL);
    }

    if ((redraw & REDRAW_INDEX) && index)
    {
      /* redraw the pager_index indicator, because the
       * flags for this message might have changed. */
      menu_redraw_current (index);

      /* print out the index status bar */
      menu_status_line (buffer, sizeof (buffer), index, NONULL(Status));
 
      move (indexoffset + (option (OPTSTATUSONTOP) ? 0 : (indexlen - 1)), 0);
      SETCOLOR (MT_COLOR_STATUS);
      BKGDSET (MT_COLOR_STATUS);
      mutt_paddstr (COLS, buffer);
      SETCOLOR (MT_COLOR_NORMAL);
      BKGDSET (MT_COLOR_NORMAL);
    }

    redraw = 0;

    if (option(OPTBRAILLEFRIENDLY)) {
      if (brailleLine!=-1) {
        move(brailleLine+1, 0);
        brailleLine = -1;
      }
    } else move (statusoffset, COLS-1);
    mutt_refresh ();

    if (IsHeader (extra) && OldHdr == extra->hdr && TopLine != topline
        && lineInfo[curline].offset < sb.st_size-1)
    {
      if (TopLine - topline > lines)
        topline += lines;
      else
        topline = TopLine;
      continue;
    }
    else
      OldHdr = NULL;
      
    ch = km_dokey (MENU_PAGER);
    if (ch != -1)
      mutt_clear_error ();
    mutt_curs_set (1);

    if (SigInt)
    {
      mutt_query_exit ();
      continue;
    }
#if defined (USE_SLANG_CURSES) || defined (HAVE_RESIZETERM)
    else if (SigWinch)
    {
      mutt_resize_screen ();

      /* Store current position. */
      lines = -1;
      for (i = 0; i <= topline; i++)
        if (!lineInfo[i].continuation)
          lines++;

      if (flags & M_PAGER_RETWINCH)
      {
        Resize = safe_malloc (sizeof (struct resize));

        Resize->line = lines;
        Resize->SearchCompiled = SearchCompiled;
        Resize->SearchBack = SearchBack;

        ch = -1;
        rc = OP_REFORMAT_WINCH;
      }
      else
      {
        for (i = 0; i < maxLine; i++)
        {
          lineInfo[i].offset = 0;
          lineInfo[i].type = -1;
          lineInfo[i].continuation = 0;
          lineInfo[i].chunks = 0;
          lineInfo[i].search_cnt = -1;
          lineInfo[i].quote = NULL;

          safe_realloc (&(lineInfo[i].syntax),
                        sizeof (struct syntax_t));
          if (SearchCompiled && lineInfo[i].search)
              FREE (&(lineInfo[i].search));
        }

        lastLine = 0;
        topline = 0;

        redraw = REDRAW_FULL | REDRAW_SIGWINCH;
        ch = 0;
      }

      SigWinch = 0;
      clearok(stdscr,TRUE);/*force complete redraw*/
      continue;
    }
#endif
    else if (ch == -1)
    {
      ch = 0;
      continue;
    }

    rc = ch;

    switch (ch)
    {
      case OP_EXIT:
        rc = -1;
        ch = -1;
        break;

      case OP_NEXT_PAGE:
        if (lineInfo[curline].offset < sb.st_size-1)
        {
          topline = upNLines (PagerContext, lineInfo, curline, hideQuoted);
        }
        else if (option (OPTPAGERSTOP))
        {
          /* emulate "less -q" and don't go on to the next message. */
          mutt_error _("Bottom of message is shown.");
        }
        else
        {
          /* end of the current message, so display the next message. */
          rc = OP_MAIN_NEXT_UNDELETED;
          ch = -1;
        }
        break;

      case OP_PREV_PAGE:
        if (topline != 0)
        {
          topline = upNLines (bodylen-PagerContext, lineInfo, topline, hideQuoted);
        }
        else
          mutt_error _("Top of message is shown.");
        break;

      case OP_NEXT_LINE:
        if (lineInfo[curline].offset < sb.st_size-1)
        {
          topline++;
          if (hideQuoted)
          {
            while (lineInfo[topline].type == MT_COLOR_QUOTED &&
                   topline < lastLine)
              topline++;
          }
        }
        else
          mutt_error _("Bottom of message is shown.");
        break;

      case OP_PREV_LINE:
        if (topline)
          topline = upNLines (1, lineInfo, topline, hideQuoted);
        else
          mutt_error _("Top of message is shown.");
        break;

      case OP_PAGER_TOP:
        if (topline)
          topline = 0;
        else
          mutt_error _("Top of message is shown.");
        break;

      case OP_HALF_UP:
        if (topline)
          topline = upNLines (bodylen/2, lineInfo, topline, hideQuoted);
        else
          mutt_error _("Top of message is shown.");
        break;

      case OP_HALF_DOWN:
        if (lineInfo[curline].offset < sb.st_size-1)
        {
          topline = upNLines (bodylen/2, lineInfo, curline, hideQuoted);
        }
        else if (option (OPTPAGERSTOP))
        {
          /* emulate "less -q" and don't go on to the next message. */
          mutt_error _("Bottom of message is shown.");
        }
        else
        {
          /* end of the current message, so display the next message. */
          rc = OP_MAIN_NEXT_UNDELETED;
          ch = -1;
        }
        break;

      case OP_SEARCH_NEXT:
      case OP_SEARCH_OPPOSITE:
        if (SearchCompiled)
        {
          wrapped = 0;

          if (SearchContext > 0 && SearchContext < LINES - 2 - option (OPTHELP) ? 1 : 0)
            searchctx = SearchContext;
          else
            searchctx = 0;

search_next:
          if ((!SearchBack && ch==OP_SEARCH_NEXT) ||
              (SearchBack &&ch==OP_SEARCH_OPPOSITE))
          {
            /* searching forward */
            for (i = wrapped ? 0 : topline + searchctx + 1; i < lastLine; i++)
            {
              if ((!hideQuoted || lineInfo[i].type != MT_COLOR_QUOTED) && 
                    !lineInfo[i].continuation && lineInfo[i].search_cnt > 0)
                break;
            }

            if (i < lastLine)
              topline = i;
            else if (wrapped || !option (OPTWRAPSEARCH))
              mutt_error _("Not found.");
            else
            {
              mutt_message _("Search wrapped to top.");
              wrapped = 1;
              goto search_next;
            }
          }
          else
          {
            /* searching backward */
            for (i = wrapped ? lastLine : topline + searchctx - 1; i >= 0; i--)
            {
              if ((!hideQuoted || (has_types && 
                    lineInfo[i].type != MT_COLOR_QUOTED)) && 
                    !lineInfo[i].continuation && lineInfo[i].search_cnt > 0)
                break;
            }

            if (i >= 0)
              topline = i;
            else if (wrapped || !option (OPTWRAPSEARCH))
              mutt_error _("Not found.");
            else
            {
              mutt_message _("Search wrapped to bottom.");
              wrapped = 1;
              goto search_next;
            }
          }

          if (lineInfo[topline].search_cnt > 0)
          {
            SearchFlag = M_SEARCH;
            /* give some context for search results */
            if (topline - searchctx > 0)
              topline -= searchctx;
          }

          break;
        }
        /* no previous search pattern, so fall through to search */

      case OP_SEARCH:
      case OP_SEARCH_REVERSE:
        strfcpy (buffer, searchbuf, sizeof (buffer));
        if (mutt_get_field ((ch == OP_SEARCH || ch == OP_SEARCH_NEXT) ?
                            _("Search for: ") : _("Reverse search for: "),
                            buffer, sizeof (buffer),
                            M_CLEAR) != 0)
          break;

        if (!strcmp (buffer, searchbuf))
        {
          if (SearchCompiled)
          {
            /* do an implicit search-next */
            if (ch == OP_SEARCH)
              ch = OP_SEARCH_NEXT;
            else
              ch = OP_SEARCH_OPPOSITE;

            wrapped = 0;
            goto search_next;
          }
        }
      
        if (!buffer[0])
          break;
      
        strfcpy (searchbuf, buffer, sizeof (searchbuf));

        /* leave SearchBack alone if ch == OP_SEARCH_NEXT */
        if (ch == OP_SEARCH)
          SearchBack = 0;
        else if (ch == OP_SEARCH_REVERSE)
          SearchBack = 1;

        if (SearchCompiled)
        {
          regfree (&SearchRE);
          for (i = 0; i < lastLine; i++)
          {
            if (lineInfo[i].search)
              FREE (&(lineInfo[i].search));
            lineInfo[i].search_cnt = -1;
          }
        }

        if ((err = REGCOMP (&SearchRE, searchbuf, REG_NEWLINE | mutt_which_case (searchbuf))) != 0)
        {
          regerror (err, &SearchRE, buffer, sizeof (buffer));
          mutt_error ("%s", buffer);
          for (i = 0; i < maxLine ; i++)
          {
            /* cleanup */
            if (lineInfo[i].search)
              FREE (&(lineInfo[i].search));
            lineInfo[i].search_cnt = -1;
          }
          SearchFlag = 0;
          SearchCompiled = 0;
        }
        else
        {
          SearchCompiled = 1;
          /* update the search pointers */
          i = 0;
          while (display_line (fp, &last_pos, &lineInfo, i, &lastLine, 
                                &maxLine, M_SEARCH | (flags & M_PAGER_NSKIP) | (flags & M_PAGER_NOWRAP),
                                &QuoteList, &q_level,
                                &force_redraw, &SearchRE) == 0)
            i++;

          if (!SearchBack)
          {
            /* searching forward */
            for (i = topline; i < lastLine; i++)
            {
              if ((!hideQuoted || lineInfo[i].type != MT_COLOR_QUOTED) && 
                    !lineInfo[i].continuation && lineInfo[i].search_cnt > 0)
                break;
            }

            if (i < lastLine) topline = i;
          }
          else
          {
            /* searching backward */
            for (i = topline; i >= 0; i--)
            {
              if ((!hideQuoted || lineInfo[i].type != MT_COLOR_QUOTED) && 
                    !lineInfo[i].continuation && lineInfo[i].search_cnt > 0)
                break;
            }

            if (i >= 0) topline = i;
          }

          if (lineInfo[topline].search_cnt == 0)
          {
            SearchFlag = 0;
            mutt_error _("Not found.");
          }
          else
          {
            SearchFlag = M_SEARCH;
            /* give some context for search results */
            if (SearchContext > 0 && SearchContext < LINES - 2 - option (OPTHELP) ? 1 : 0)
              searchctx = SearchContext;
            else
              searchctx = 0;
            if (topline - searchctx > 0)
              topline -= searchctx;
          }

        }
        redraw = REDRAW_BODY;
        break;

      case OP_SEARCH_TOGGLE:
        if (SearchCompiled)
        {
          SearchFlag ^= M_SEARCH;
          redraw = REDRAW_BODY;
        }
        break;

      case OP_HELP:
        /* don't let the user enter the help-menu from the help screen! */
        if (! InHelp)
        {
          InHelp = 1;
          mutt_help (MENU_PAGER);
          redraw = REDRAW_FULL;
          InHelp = 0;
        }
        else
          mutt_error _("Help is currently being shown.");
        break;

      case OP_PAGER_HIDE_QUOTED:
        if (has_types)
        {
          hideQuoted ^= M_HIDE;
          if (hideQuoted && lineInfo[topline].type == MT_COLOR_QUOTED)
            topline = upNLines (1, lineInfo, topline, hideQuoted);
          else
            redraw = REDRAW_BODY;
        }
        break;

      case OP_PAGER_SKIP_QUOTED:
        if (has_types)
        {
          int dretval = 0;
          int new_topline = topline;

          while ((new_topline < lastLine ||
                  (0 == (dretval = display_line (fp, &last_pos, &lineInfo,
                         new_topline, &lastLine, &maxLine, M_TYPES | (flags & M_PAGER_NOWRAP),
                         &QuoteList, &q_level, &force_redraw, &SearchRE))))
                 && lineInfo[new_topline].type != MT_COLOR_QUOTED)
            new_topline++;

          if (dretval < 0)
          {
            mutt_error _("No more quoted text.");
            break;
          }

          while ((new_topline < lastLine ||
                  (0 == (dretval = display_line (fp, &last_pos, &lineInfo,
                         new_topline, &lastLine, &maxLine, M_TYPES | (flags & M_PAGER_NOWRAP),
                         &QuoteList, &q_level, &force_redraw, &SearchRE))))
                 && lineInfo[new_topline].type == MT_COLOR_QUOTED)
            new_topline++;

          if (dretval < 0)
          {
            mutt_error _("No more unquoted text after quoted text.");
            break;        
          }
          topline = new_topline;
        }
        break;

      case OP_PAGER_BOTTOM: /* move to the end of the file */
        if (lineInfo[curline].offset < sb.st_size - 1)
        {
          i = curline;
          /* make sure the types are defined to the end of file */
          while (display_line (fp, &last_pos, &lineInfo, i, &lastLine, 
                                &maxLine, has_types | (flags & M_PAGER_NOWRAP),
                                &QuoteList, &q_level, &force_redraw,
                                &SearchRE) == 0)
            i++;
          topline = upNLines (bodylen, lineInfo, lastLine, hideQuoted);
        }
        else
          mutt_error _("Bottom of message is shown.");
        break;

      case OP_REDRAW:
        clearok (stdscr, TRUE);
        redraw = REDRAW_FULL;
        break;

      case OP_NULL:
        km_error_key (MENU_PAGER);
        break;

        /* --------------------------------------------------------------------
         * The following are operations on the current message rather than
         * adjusting the view of the message.
         */

      case OP_BOUNCE_MESSAGE:
        CHECK_MODE(IsHeader (extra) || IsMsgAttach (extra))
        CHECK_ATTACH;
        if (IsMsgAttach (extra))
          mutt_attach_bounce (extra->fp, extra->hdr,
                              extra->idx, extra->idxlen,
                              extra->bdy);
        else
          ci_bounce_message (extra->hdr, &redraw);
        break;

      case OP_RESEND:
        CHECK_MODE(IsHeader (extra) || IsMsgAttach (extra))
        CHECK_ATTACH;
        if (IsMsgAttach (extra))
          mutt_attach_resend (extra->fp, extra->hdr,
                              extra->idx, extra->idxlen,
                              extra->bdy);
        else
          mutt_resend_message (NULL, extra->ctx, extra->hdr);
        redraw = REDRAW_FULL;
        break;

      case OP_CHECK_TRADITIONAL:
        CHECK_MODE (IsHeader (extra));
        if (!(WithCrypto & APPLICATION_PGP))
          break;
        if (!(extra->hdr->security & PGP_TRADITIONAL_CHECKED)) 
        {
          ch = -1;
          rc = OP_CHECK_TRADITIONAL;
        }
        break;
      
      case OP_CREATE_ALIAS:
        CHECK_MODE(IsHeader (extra) || IsMsgAttach (extra));
        if (IsMsgAttach (extra))
          mutt_create_alias (extra->bdy->hdr->env, NULL);
        else
          mutt_create_alias (extra->hdr->env, NULL);
        MAYBE_REDRAW (redraw);
        break;

      case OP_DELETE:
        CHECK_MODE(IsHeader (extra));
        CHECK_READONLY;
        CHECK_ACL(M_ACL_DELETE, _("delete message"));

        mutt_set_flag (Context, extra->hdr, M_DELETE, 1);
        if (option (OPTDELETEUNTAG))
          mutt_set_flag (Context, extra->hdr, M_TAG, 0);
        redraw = REDRAW_STATUS | REDRAW_INDEX;
        if (option (OPTRESOLVE))
        {
          ch = -1;
          rc = OP_MAIN_NEXT_UNDELETED;
        }
        break;

      case OP_MAIN_SET_FLAG:
      case OP_MAIN_CLEAR_FLAG:
        CHECK_MODE(IsHeader (extra));
        CHECK_READONLY;

        if (mutt_change_flag (extra->hdr, (ch == OP_MAIN_SET_FLAG)) == 0)
          redraw |= REDRAW_STATUS | REDRAW_INDEX;
        if (extra->hdr->deleted && option (OPTRESOLVE))
        {
          ch = -1;
          rc = OP_MAIN_NEXT_UNDELETED;
        }
        break;

      case OP_DELETE_THREAD:
      case OP_DELETE_SUBTHREAD:
        CHECK_MODE(IsHeader (extra));
        CHECK_READONLY;
        CHECK_ACL(M_ACL_DELETE, _("delete message(s)"));

        r = mutt_thread_set_flag (extra->hdr, M_DELETE, 1,
                                  ch == OP_DELETE_THREAD ? 0 : 1);

        if (r != -1)
        {
          if (option (OPTDELETEUNTAG))
            mutt_thread_set_flag (extra->hdr, M_TAG, 0,
                                  ch == OP_DELETE_THREAD ? 0 : 1);
          if (option (OPTRESOLVE))
          {
            rc = OP_MAIN_NEXT_UNDELETED;
            ch = -1;
          }

          if (!option (OPTRESOLVE) && PagerIndexLines)
            redraw = REDRAW_FULL;
          else
            redraw = REDRAW_STATUS | REDRAW_INDEX;
        }
        break;

      case OP_DISPLAY_ADDRESS:
        CHECK_MODE(IsHeader (extra) || IsMsgAttach (extra));
        if (IsMsgAttach (extra))
          mutt_display_address (extra->bdy->hdr->env);
        else
          mutt_display_address (extra->hdr->env);
        break;

      case OP_ENTER_COMMAND:
        old_smart_wrap = option (OPTWRAP);
        old_markers = option (OPTMARKERS);
        old_PagerIndexLines = PagerIndexLines;

        CurrentMenu = MENU_PAGER;
        mutt_enter_command ();

        if (option (OPTNEEDRESORT))
        {
          unset_option (OPTNEEDRESORT);
          CHECK_MODE(IsHeader (extra));
          set_option (OPTNEEDRESORT);
        }

        if (old_PagerIndexLines != PagerIndexLines)
        {
          if (index)
            mutt_menuDestroy (&index);
          index = NULL;
        }
        
        if (option (OPTWRAP) != old_smart_wrap || 
            option (OPTMARKERS) != old_markers)
        {
          if (flags & M_PAGER_RETWINCH)
          {
            ch = -1;
            rc = OP_REFORMAT_WINCH;
            continue;
          }

          /* count the real lines above */
          j = 0;
          for (i = 0; i <= topline; i++)
          {
            if (!lineInfo[i].continuation)
              j++;
          }

          /* we need to restart the whole thing */
          for (i = 0; i < maxLine; i++)
          {
            lineInfo[i].offset = 0;
            lineInfo[i].type = -1;
            lineInfo[i].continuation = 0;
            lineInfo[i].chunks = 0;
            lineInfo[i].search_cnt = -1;
            lineInfo[i].quote = NULL;

            safe_realloc (&(lineInfo[i].syntax), sizeof (struct syntax_t));
            if (SearchCompiled && lineInfo[i].search)
                FREE (&(lineInfo[i].search));
          }

          if (SearchCompiled)
          {
            regfree (&SearchRE);
            SearchCompiled = 0;
          }
          SearchFlag = 0;

          /* try to keep the old position */
          topline = 0;
          lastLine = 0;
          while (j > 0 && display_line (fp, &last_pos, &lineInfo, topline, 
                                        &lastLine, &maxLine,
                                        (has_types ? M_TYPES : 0) | (flags & M_PAGER_NOWRAP),
                                        &QuoteList, &q_level, &force_redraw,
                                        &SearchRE) == 0)
          {
            if (! lineInfo[topline].continuation)
              j--;
            if (j > 0)
              topline++;
          }

          ch = 0;
        }

        if (option (OPTFORCEREDRAWPAGER))
          redraw = REDRAW_FULL;
        unset_option (OPTFORCEREDRAWINDEX);
        unset_option (OPTFORCEREDRAWPAGER);
        break;

      case OP_FLAG_MESSAGE:
        CHECK_MODE(IsHeader (extra));
        CHECK_READONLY;
        CHECK_ACL(M_ACL_WRITE, "flag message");

        mutt_set_flag (Context, extra->hdr, M_FLAG, !extra->hdr->flagged);
        redraw = REDRAW_STATUS | REDRAW_INDEX;
        if (option (OPTRESOLVE))
        {
          ch = -1;
          rc = OP_MAIN_NEXT_UNDELETED;
        }
        break;

      case OP_PIPE:
        CHECK_MODE(IsHeader (extra) || IsAttach (extra));
        if (IsAttach (extra))
          mutt_pipe_attachment_list (extra->fp, 0, extra->bdy, 0);
        else
          mutt_pipe_message (extra->hdr);
        MAYBE_REDRAW (redraw);
        break;

      case OP_PRINT:
        CHECK_MODE(IsHeader (extra) || IsAttach (extra));
        if (IsAttach (extra))
          mutt_print_attachment_list (extra->fp, 0, extra->bdy);
        else
          mutt_print_message (extra->hdr);
        break;

      case OP_MAIL:
        CHECK_MODE(IsHeader (extra) && !IsAttach (extra));
        CHECK_ATTACH;      
        ci_send_message (0, NULL, NULL, extra->ctx, NULL);
        redraw = REDRAW_FULL;
        break;

      case OP_REPLY:
        CHECK_MODE(IsHeader (extra) || IsMsgAttach (extra));
        CHECK_ATTACH;      
        if (IsMsgAttach (extra)) 
          mutt_attach_reply (extra->fp, extra->hdr, extra->idx,
                             extra->idxlen, extra->bdy,
                             SENDREPLY);
        else
          ci_send_message (SENDREPLY, NULL, NULL, extra->ctx, extra->hdr);
        redraw = REDRAW_FULL;
        break;

      case OP_RECALL_MESSAGE:
        CHECK_MODE(IsHeader (extra) && !IsAttach(extra));
        CHECK_ATTACH;
        ci_send_message (SENDPOSTPONED, NULL, NULL, extra->ctx, extra->hdr);
        redraw = REDRAW_FULL;
        break;

      case OP_GROUP_REPLY:
        CHECK_MODE(IsHeader (extra) || IsMsgAttach (extra));
        CHECK_ATTACH;
        if (IsMsgAttach (extra))
          mutt_attach_reply (extra->fp, extra->hdr, extra->idx,
                             extra->idxlen, extra->bdy, SENDREPLY|SENDGROUPREPLY);
        else
          ci_send_message (SENDREPLY | SENDGROUPREPLY, NULL, NULL, extra->ctx, extra->hdr);
        redraw = REDRAW_FULL;
        break;

      case OP_LIST_REPLY:
        CHECK_MODE(IsHeader (extra) || IsMsgAttach (extra));
        CHECK_ATTACH;        
        if (IsMsgAttach (extra))
          mutt_attach_reply (extra->fp, extra->hdr, extra->idx,
                             extra->idxlen, extra->bdy, SENDREPLY|SENDLISTREPLY);
        else
          ci_send_message (SENDREPLY | SENDLISTREPLY, NULL, NULL, extra->ctx, extra->hdr);
        redraw = REDRAW_FULL;
        break;

      case OP_FORWARD_MESSAGE:
        CHECK_MODE(IsHeader (extra) || IsMsgAttach (extra));
        CHECK_ATTACH;
        if (IsMsgAttach (extra))
          mutt_attach_forward (extra->fp, extra->hdr, extra->idx,
                               extra->idxlen, extra->bdy);
        else
          ci_send_message (SENDFORWARD, NULL, NULL, extra->ctx, extra->hdr);
        redraw = REDRAW_FULL;
        break;

      case OP_DECRYPT_SAVE:
        if (!WithCrypto)
        {
          ch = -1;
          break;
        }
        /* fall through */
      case OP_SAVE:
        if (IsAttach (extra))
        {
          mutt_save_attachment_list (extra->fp, 0, extra->bdy, extra->hdr, NULL);
          break;
        }
        /* fall through */
      case OP_COPY_MESSAGE:
      case OP_DECODE_SAVE:
      case OP_DECODE_COPY:
      case OP_DECRYPT_COPY:
        if (!WithCrypto && ch == OP_DECRYPT_COPY)
        {
          ch = -1;
          break;
        }
        CHECK_MODE(IsHeader (extra));
        if (mutt_save_message (extra->hdr,
                               (ch == OP_DECRYPT_SAVE) ||
                               (ch == OP_SAVE) || (ch == OP_DECODE_SAVE),
                               (ch == OP_DECODE_SAVE) || (ch == OP_DECODE_COPY),
                               (ch == OP_DECRYPT_SAVE) || (ch == OP_DECRYPT_COPY) ||
                               0,
                               &redraw) == 0 && (ch == OP_SAVE || ch == OP_DECODE_SAVE
                                                 || ch == OP_DECRYPT_SAVE
                                                 ))
        {
          if (option (OPTRESOLVE))
          {
            ch = -1;
            rc = OP_MAIN_NEXT_UNDELETED;
          }
          else
            redraw |= REDRAW_STATUS | REDRAW_INDEX;
        }
        MAYBE_REDRAW (redraw);
        break;

      case OP_SHELL_ESCAPE:
        mutt_shell_escape ();
        MAYBE_REDRAW (redraw);
        break;

      case OP_TAG:
        CHECK_MODE(IsHeader (extra));
        mutt_set_flag (Context, extra->hdr, M_TAG, !extra->hdr->tagged);

        Context->last_tag = extra->hdr->tagged ? extra->hdr :
          ((Context->last_tag == extra->hdr && !extra->hdr->tagged)
           ? NULL : Context->last_tag);

        redraw = REDRAW_STATUS | REDRAW_INDEX;
        if (option (OPTRESOLVE))
        {
          ch = -1;
          rc = OP_NEXT_ENTRY;
        }
        break;

      case OP_TOGGLE_NEW:
        CHECK_MODE(IsHeader (extra));
        CHECK_READONLY;
        CHECK_ACL(M_ACL_SEEN, _("toggle new"));

        if (extra->hdr->read || extra->hdr->old)
          mutt_set_flag (Context, extra->hdr, M_NEW, 1);
        else if (!first)
          mutt_set_flag (Context, extra->hdr, M_READ, 1);
        first = 0;
        Context->msgnotreadyet = -1;
        redraw = REDRAW_STATUS | REDRAW_INDEX;
        if (option (OPTRESOLVE))
        {
          ch = -1;
          rc = OP_MAIN_NEXT_UNDELETED;
        }
        break;

      case OP_UNDELETE:
        CHECK_MODE(IsHeader (extra));
        CHECK_READONLY;
        CHECK_ACL(M_ACL_DELETE, _("undelete message"));

        mutt_set_flag (Context, extra->hdr, M_DELETE, 0);
        redraw = REDRAW_STATUS | REDRAW_INDEX;
        if (option (OPTRESOLVE))
        {
          ch = -1;
          rc = OP_NEXT_ENTRY;
        }
        break;

      case OP_UNDELETE_THREAD:
      case OP_UNDELETE_SUBTHREAD:
        CHECK_MODE(IsHeader (extra));
        CHECK_READONLY;
        CHECK_ACL(M_ACL_DELETE, _("undelete message(s)"));

        r = mutt_thread_set_flag (extra->hdr, M_DELETE, 0,
                                  ch == OP_UNDELETE_THREAD ? 0 : 1);

        if (r != -1)
        {
          if (option (OPTRESOLVE))
          {
            rc = (ch == OP_DELETE_THREAD) ?
                                  OP_MAIN_NEXT_THREAD : OP_MAIN_NEXT_SUBTHREAD;
            ch = -1;
          }

          if (!option (OPTRESOLVE) && PagerIndexLines)
            redraw = REDRAW_FULL;
          else
            redraw = REDRAW_STATUS | REDRAW_INDEX;
        }
        break;

      case OP_VERSION:
        mutt_version ();
        break;

      case OP_BUFFY_LIST:
        mutt_buffy_list ();
        break;

      case OP_VIEW_ATTACHMENTS:
        if (flags & M_PAGER_ATTACHMENT)
        {
          ch = -1;
          rc = OP_ATTACH_COLLAPSE;
          break;
        }
        CHECK_MODE(IsHeader (extra));
        mutt_view_attachments (extra->hdr);
        if (extra->hdr->attach_del)
          Context->changed = 1;
        redraw = REDRAW_FULL;
        break;


      case OP_MAIL_KEY:
        if (!(WithCrypto & APPLICATION_PGP))
        {
          ch = -1;
          break;
        }
        CHECK_MODE(IsHeader(extra));
        CHECK_ATTACH;
        ci_send_message (SENDKEY, NULL, NULL, extra->ctx, extra->hdr);
        redraw = REDRAW_FULL;
        break;


      case OP_FORGET_PASSPHRASE:
        crypt_forget_passphrase ();
        break;

      case OP_EXTRACT_KEYS:
        if (!WithCrypto)
        {
          ch = -1;
          break;
        }
        CHECK_MODE(IsHeader(extra));
        crypt_extract_keys_from_messages(extra->hdr);
        redraw = REDRAW_FULL;
        break;

      case OP_WHAT_KEY:
        mutt_what_key ();
        break;

      default:
        ch = -1;
        break;
    }
  }

  safe_fclose (&fp);
  if (IsHeader (extra))
  {
    Context->msgnotreadyet = -1;
    if (rc == -1)
      OldHdr = NULL;
    else
    {
      TopLine = topline;
      OldHdr = extra->hdr;
    }
  }
    
  cleanup_quote (&QuoteList);
  
  for (i = 0; i < maxLine ; i++)
  {
    FREE (&(lineInfo[i].syntax));
    if (SearchCompiled && lineInfo[i].search)
      FREE (&(lineInfo[i].search));
  }
  if (SearchCompiled)
  {
    regfree (&SearchRE);
    SearchCompiled = 0;
  }
  FREE (&lineInfo);
  if (index)
    mutt_menuDestroy(&index);
  return (rc != -1 ? rc : 0);
}