enter.c

/**
 * @file
 * GUI ask the user to enter a string
 *
 * @authors
 * Copyright (C) 1996-2000,2007,2011,2013 Michael R. Elkins <me@mutt.org>
 * Copyright (C) 2000-2001 Edmund Grimley Evans <edmundo@rano.org>
 *
 * @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/>.
 */

#include "config.h"
#include <stddef.h>
#include <stdbool.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include "mutt/mutt.h"
#include "mutt.h"
#include "enter_state.h"
#include "globals.h"
#include "history.h"
#include "keymap.h"
#include "mutt_curses.h"
#include "opcodes.h"
#include "protos.h"

/**
 * enum RedrawFlags - redraw flags for mutt_enter_string_full()
 */
enum RedrawFlags
{
  MUTT_REDRAW_INIT = 1, /**< go to end of line and redraw */
  MUTT_REDRAW_LINE      /**< redraw entire line */
};

/* combining mark / non-spacing character */
#define COMB_CHAR(wc) (IsWPrint(wc) && !wcwidth(wc))

static int my_addwch(wchar_t wc)
{
  int n = wcwidth(wc);
  if (IsWPrint(wc) && n > 0)
    return mutt_addwch(wc);
  if (!(wc & ~0x7f))
    return printw("^%c", ((int) wc + 0x40) & 0x7f);
  if (!(wc & ~0xffff))
    return printw("\\u%04x", (int) wc);
  return printw("\\u%08x", (int) wc);
}

/**
 * replace_part - Search and replace on a buffer
 *
 * Replace part of the wchar_t buffer, from FROM to CURPOS, by BUF.
 */
static void replace_part(struct EnterState *state, size_t from, char *buf)
{
  /* Save the suffix */
  size_t savelen = state->lastchar - state->curpos;
  wchar_t *savebuf = NULL;

  if (savelen)
  {
    savebuf = mutt_mem_calloc(savelen, sizeof(wchar_t));
    memcpy(savebuf, state->wbuf + state->curpos, savelen * sizeof(wchar_t));
  }

  /* Convert to wide characters */
  state->curpos = mutt_mb_mbstowcs(&state->wbuf, &state->wbuflen, from, buf);

  if (savelen)
  {
    /* Make space for suffix */
    if (state->curpos + savelen > state->wbuflen)
    {
      state->wbuflen = state->curpos + savelen;
      mutt_mem_realloc(&state->wbuf, state->wbuflen * sizeof(wchar_t));
    }

    /* Restore suffix */
    memcpy(state->wbuf + state->curpos, savebuf, savelen * sizeof(wchar_t));
    FREE(&savebuf);
  }

  state->lastchar = state->curpos + savelen;
}

/**
 * mutt_enter_string_simple - Ask the user for a string
 * @param buf    Buffer to store the string
 * @param buflen Buffer length
 * @param col    Initial cursor position
 * @param flags  Flags such as MUTT_FILE
 * @retval 0 if input was given
 * @retval -1 if abort
 *
 * This function is for very basic input, currently used only by the
 * built-in editor.  It does not handle screen redrawing on resizes
 * well, because there is no active menu for the built-in editor.
 * Most callers should prefer mutt_get_field() instead.
 */
int mutt_enter_string(char *buf, size_t buflen, int col, int flags)
{
  int rc;
  struct EnterState *es = mutt_new_enter_state();
  do
  {
    if (SigWinch)
    {
      SigWinch = 0;
      mutt_resize_screen();
      clearok(stdscr, TRUE);
    }
    rc = mutt_enter_string_full(buf, buflen, col, flags, 0, NULL, NULL, es);
  } while (rc == 1);
  mutt_free_enter_state(&es);
  return rc;
}

/**
 * mutt_enter_string_full - Ask the user for a string
 * @param[in]  buf      Buffer to store the string
 * @param[in]  buflen   Buffer length
 * @param[in]  col      Initial cursor position
 * @param[in]  flags    Flags such as MUTT_FILE
 * @param[in]  multiple Allow multiple matches
 * @param[out] files    List of files selected
 * @param[out] numfiles Number of files selected
 * @param[out] state    Current state (if function is called repeatedly)
 * @retval 1  need to redraw the screen and call me again
 * @retval 0  if input was given
 * @retval -1 if abort
 */
int mutt_enter_string_full(char *buf, size_t buflen, int col, int flags, int multiple,
                           char ***files, int *numfiles, struct EnterState *state)
{
  int width = MuttMessageWindow->cols - col - 1;
  int redraw;
  int pass = (flags & MUTT_PASS);
  int first = 1;
  int ch, w, r;
  size_t i;
  wchar_t *tempbuf = NULL;
  size_t templen = 0;
  enum HistoryClass hclass;
  wchar_t wc;
  mbstate_t mbstate;

  int rc = 0;
  memset(&mbstate, 0, sizeof(mbstate));

  if (state->wbuf)
  {
    /* Coming back after return 1 */
    redraw = MUTT_REDRAW_LINE;
    first = 0;
  }
  else
  {
    /* Initialise wbuf from buf */
    state->wbuflen = 0;
    state->lastchar = mutt_mb_mbstowcs(&state->wbuf, &state->wbuflen, 0, buf);
    redraw = MUTT_REDRAW_INIT;
  }

  if (flags & MUTT_FILE)
    hclass = HC_FILE;
  else if (flags & MUTT_EFILE)
    hclass = HC_MBOX;
  else if (flags & MUTT_CMD)
    hclass = HC_CMD;
  else if (flags & MUTT_ALIAS)
    hclass = HC_ALIAS;
  else if (flags & MUTT_COMMAND)
    hclass = HC_COMMAND;
  else if (flags & MUTT_PATTERN)
    hclass = HC_PATTERN;
  else
    hclass = HC_OTHER;

  while (true)
  {
    if (redraw && !pass)
    {
      if (redraw == MUTT_REDRAW_INIT)
      {
        /* Go to end of line */
        state->curpos = state->lastchar;
        state->begin = mutt_mb_width_ceiling(
            state->wbuf, state->lastchar,
            mutt_mb_wcswidth(state->wbuf, state->lastchar) - width + 1);
      }
      if (state->curpos < state->begin ||
          mutt_mb_wcswidth(state->wbuf + state->begin, state->curpos - state->begin) >= width)
      {
        state->begin = mutt_mb_width_ceiling(
            state->wbuf, state->lastchar,
            mutt_mb_wcswidth(state->wbuf, state->curpos) - width / 2);
      }
      mutt_window_move(MuttMessageWindow, 0, col);
      w = 0;
      for (i = state->begin; i < state->lastchar; i++)
      {
        w += mutt_mb_wcwidth(state->wbuf[i]);
        if (w > width)
          break;
        my_addwch(state->wbuf[i]);
      }
      mutt_window_clrtoeol(MuttMessageWindow);
      mutt_window_move(MuttMessageWindow, 0,
                       col + mutt_mb_wcswidth(state->wbuf + state->begin,
                                              state->curpos - state->begin));
    }
    mutt_refresh();

    ch = km_dokey(MENU_EDITOR);
    if (ch < 0)
    {
      rc = (SigWinch && ch == -2) ? 1 : -1;
      goto bye;
    }

    if (ch != OP_NULL)
    {
      first = 0;
      if (ch != OP_EDITOR_COMPLETE && ch != OP_EDITOR_COMPLETE_QUERY)
        state->tabs = 0;
      redraw = MUTT_REDRAW_LINE;
      switch (ch)
      {
        case OP_EDITOR_HISTORY_UP:
          state->curpos = state->lastchar;
          if (mutt_hist_at_scratch(hclass))
          {
            mutt_mb_wcstombs(buf, buflen, state->wbuf, state->curpos);
            mutt_hist_save_scratch(hclass, buf);
          }
          replace_part(state, 0, mutt_hist_prev(hclass));
          redraw = MUTT_REDRAW_INIT;
          break;

        case OP_EDITOR_HISTORY_DOWN:
          state->curpos = state->lastchar;
          if (mutt_hist_at_scratch(hclass))
          {
            mutt_mb_wcstombs(buf, buflen, state->wbuf, state->curpos);
            mutt_hist_save_scratch(hclass, buf);
          }
          replace_part(state, 0, mutt_hist_next(hclass));
          redraw = MUTT_REDRAW_INIT;
          break;

        case OP_EDITOR_HISTORY_SEARCH:
          state->curpos = state->lastchar;
          mutt_mb_wcstombs(buf, buflen, state->wbuf, state->curpos);
          mutt_history_complete(buf, buflen, hclass);
          replace_part(state, 0, buf);
          rc = 1;
          goto bye;
          break;

        case OP_EDITOR_BACKSPACE:
          if (state->curpos == 0)
            BEEP();
          else
          {
            i = state->curpos;
            while (i && COMB_CHAR(state->wbuf[i - 1]))
              i--;
            if (i)
              i--;
            memmove(state->wbuf + i, state->wbuf + state->curpos,
                    (state->lastchar - state->curpos) * sizeof(wchar_t));
            state->lastchar -= state->curpos - i;
            state->curpos = i;
          }
          break;

        case OP_EDITOR_BOL:
          state->curpos = 0;
          break;

        case OP_EDITOR_EOL:
          redraw = MUTT_REDRAW_INIT;
          break;

        case OP_EDITOR_KILL_LINE:
          state->curpos = state->lastchar = 0;
          break;

        case OP_EDITOR_KILL_EOL:
          state->lastchar = state->curpos;
          break;

        case OP_EDITOR_BACKWARD_CHAR:
          if (state->curpos == 0)
            BEEP();
          else
          {
            while (state->curpos && COMB_CHAR(state->wbuf[state->curpos - 1]))
              state->curpos--;
            if (state->curpos)
              state->curpos--;
          }
          break;

        case OP_EDITOR_FORWARD_CHAR:
          if (state->curpos == state->lastchar)
            BEEP();
          else
          {
            state->curpos++;
            while (state->curpos < state->lastchar &&
                   COMB_CHAR(state->wbuf[state->curpos]))
            {
              state->curpos++;
            }
          }
          break;

        case OP_EDITOR_BACKWARD_WORD:
          if (state->curpos == 0)
            BEEP();
          else
          {
            while (state->curpos && iswspace(state->wbuf[state->curpos - 1]))
              state->curpos--;
            while (state->curpos && !iswspace(state->wbuf[state->curpos - 1]))
              state->curpos--;
          }
          break;

        case OP_EDITOR_FORWARD_WORD:
          if (state->curpos == state->lastchar)
            BEEP();
          else
          {
            while (state->curpos < state->lastchar && iswspace(state->wbuf[state->curpos]))
              state->curpos++;
            while (state->curpos < state->lastchar &&
                   !iswspace(state->wbuf[state->curpos]))
            {
              state->curpos++;
            }
          }
          break;

        case OP_EDITOR_CAPITALIZE_WORD:
        case OP_EDITOR_UPCASE_WORD:
        case OP_EDITOR_DOWNCASE_WORD:
          if (state->curpos == state->lastchar)
          {
            BEEP();
            break;
          }
          while (state->curpos && !iswspace(state->wbuf[state->curpos]))
            state->curpos--;
          while (state->curpos < state->lastchar && iswspace(state->wbuf[state->curpos]))
            state->curpos++;
          while (state->curpos < state->lastchar && !iswspace(state->wbuf[state->curpos]))
          {
            if (ch == OP_EDITOR_DOWNCASE_WORD)
              state->wbuf[state->curpos] = towlower(state->wbuf[state->curpos]);
            else
            {
              state->wbuf[state->curpos] = towupper(state->wbuf[state->curpos]);
              if (ch == OP_EDITOR_CAPITALIZE_WORD)
                ch = OP_EDITOR_DOWNCASE_WORD;
            }
            state->curpos++;
          }
          break;

        case OP_EDITOR_DELETE_CHAR:
          if (state->curpos == state->lastchar)
            BEEP();
          else
          {
            i = state->curpos;
            while (i < state->lastchar && COMB_CHAR(state->wbuf[i]))
              i++;
            if (i < state->lastchar)
              i++;
            while (i < state->lastchar && COMB_CHAR(state->wbuf[i]))
              i++;
            memmove(state->wbuf + state->curpos, state->wbuf + i,
                    (state->lastchar - i) * sizeof(wchar_t));
            state->lastchar -= i - state->curpos;
          }
          break;

        case OP_EDITOR_KILL_WORD:
          /* delete to beginning of word */
          if (state->curpos != 0)
          {
            i = state->curpos;
            while (i && iswspace(state->wbuf[i - 1]))
              i--;
            if (i)
            {
              if (iswalnum(state->wbuf[i - 1]))
              {
                for (--i; i && iswalnum(state->wbuf[i - 1]); i--)
                  ;
              }
              else
                i--;
            }
            memmove(state->wbuf + i, state->wbuf + state->curpos,
                    (state->lastchar - state->curpos) * sizeof(wchar_t));
            state->lastchar += i - state->curpos;
            state->curpos = i;
          }
          break;

        case OP_EDITOR_KILL_EOW:
          /* delete to end of word */

          /* first skip over whitespace */
          for (i = state->curpos; i < state->lastchar && iswspace(state->wbuf[i]); i++)
            ;

          /* if there are any characters left.. */
          if (i < state->lastchar)
          {
            /* if the current character is alphanumeric.. */
            if (iswalnum(state->wbuf[i]))
            {
              /* skip over the rest of the word consistent of only alphanumerics */
              for (; i < state->lastchar && iswalnum(state->wbuf[i]); i++)
                ;
            }
            else
            {
              /* skip over one non-alphanumeric character */
              i++;
            }
          }

          memmove(state->wbuf + state->curpos, state->wbuf + i,
                  (state->lastchar - i) * sizeof(wchar_t));
          state->lastchar += state->curpos - i;
          break;

        case OP_EDITOR_BUFFY_CYCLE:
          if (flags & MUTT_EFILE)
          {
            first = 1; /* clear input if user types a real key later */
            mutt_mb_wcstombs(buf, buflen, state->wbuf, state->curpos);
            mutt_buffy(buf, buflen);
            state->curpos = state->lastchar =
                mutt_mb_mbstowcs(&state->wbuf, &state->wbuflen, 0, buf);
            break;
          }
          else if (!(flags & MUTT_FILE))
          {
            goto self_insert;
          }
          /* fallthrough */

        case OP_EDITOR_COMPLETE:
        case OP_EDITOR_COMPLETE_QUERY:
          state->tabs++;
          if (flags & MUTT_CMD)
          {
            for (i = state->curpos; i && !mutt_mb_is_shell_char(state->wbuf[i - 1]); i--)
              ;
            mutt_mb_wcstombs(buf, buflen, state->wbuf + i, state->curpos - i);
            if (tempbuf && templen == state->lastchar - i &&
                !memcmp(tempbuf, state->wbuf + i, (state->lastchar - i) * sizeof(wchar_t)))
            {
              mutt_select_file(buf, buflen,
                               (flags & MUTT_EFILE) ? MUTT_SEL_FOLDER : 0, NULL, NULL);
              if (*buf)
                replace_part(state, i, buf);
              rc = 1;
              goto bye;
            }
            if (!mutt_complete(buf, buflen))
            {
              templen = state->lastchar - i;
              mutt_mem_realloc(&tempbuf, templen * sizeof(wchar_t));
            }
            else
              BEEP();

            replace_part(state, i, buf);
          }
          else if (flags & MUTT_ALIAS && ch == OP_EDITOR_COMPLETE)
          {
            /* invoke the alias-menu to get more addresses */
            for (i = state->curpos;
                 i && state->wbuf[i - 1] != ',' && state->wbuf[i - 1] != ':'; i--)
              ;
            for (; i < state->lastchar && state->wbuf[i] == ' '; i++)
              ;
            mutt_mb_wcstombs(buf, buflen, state->wbuf + i, state->curpos - i);
            r = mutt_alias_complete(buf, buflen);
            replace_part(state, i, buf);
            if (!r)
            {
              rc = 1;
              goto bye;
            }
            break;
          }
          else if (flags & MUTT_LABEL && ch == OP_EDITOR_COMPLETE)
          {
            for (i = state->curpos;
                 i && state->wbuf[i - 1] != ',' && state->wbuf[i - 1] != ':'; i--)
              ;
            for (; i < state->lastchar && state->wbuf[i] == ' '; i++)
              ;
            mutt_mb_wcstombs(buf, buflen, state->wbuf + i, state->curpos - i);
            r = mutt_label_complete(buf, buflen, state->tabs);
            replace_part(state, i, buf);
            if (!r)
            {
              rc = 1;
              goto bye;
            }
            break;
          }
          else if (flags & MUTT_PATTERN && ch == OP_EDITOR_COMPLETE)
          {
            for (i = state->curpos; i && state->wbuf[i - 1] != '~'; i--)
              ;
            if (i && i < state->curpos && state->wbuf[i - 1] == '~' && state->wbuf[i] == 'y')
            {
              i++;
              mutt_mb_wcstombs(buf, buflen, state->wbuf + i, state->curpos - i);
              r = mutt_label_complete(buf, buflen, state->tabs);
              replace_part(state, i, buf);
              if (!r)
              {
                rc = 1;
                goto bye;
              }
            }
            else
              goto self_insert;
            break;
          }
          else if (flags & MUTT_ALIAS && ch == OP_EDITOR_COMPLETE_QUERY)
          {
            i = state->curpos;
            if (i != 0)
            {
              for (; i && state->wbuf[i - 1] != ','; i--)
                ;
              for (; i < state->curpos && state->wbuf[i] == ' '; i++)
                ;
            }

            mutt_mb_wcstombs(buf, buflen, state->wbuf + i, state->curpos - i);
            mutt_query_complete(buf, buflen);
            replace_part(state, i, buf);

            rc = 1;
            goto bye;
          }
          else if (flags & MUTT_COMMAND)
          {
            mutt_mb_wcstombs(buf, buflen, state->wbuf, state->curpos);
            i = strlen(buf);
            if (i && buf[i - 1] == '=' && mutt_var_value_complete(buf, buflen, i))
              state->tabs = 0;
            else if (!mutt_command_complete(buf, buflen, i, state->tabs))
              BEEP();
            replace_part(state, 0, buf);
          }
          else if (flags & (MUTT_FILE | MUTT_EFILE))
          {
            mutt_mb_wcstombs(buf, buflen, state->wbuf, state->curpos);

            /* see if the path has changed from the last time */
            if ((!tempbuf && !state->lastchar) ||
                (tempbuf && templen == state->lastchar &&
                 !memcmp(tempbuf, state->wbuf, state->lastchar * sizeof(wchar_t))))
            {
              mutt_select_file(buf, buflen,
                               ((flags & MUTT_EFILE) ? MUTT_SEL_FOLDER : 0) |
                                   (multiple ? MUTT_SEL_MULTI : 0),
                               files, numfiles);
              if (*buf)
              {
                mutt_pretty_mailbox(buf, buflen);
                if (!pass)
                  mutt_hist_add(hclass, buf, true);
                rc = 0;
                goto bye;
              }

              /* file selection cancelled */
              rc = 1;
              goto bye;
            }

            if (!mutt_complete(buf, buflen))
            {
              templen = state->lastchar;
              mutt_mem_realloc(&tempbuf, templen * sizeof(wchar_t));
              memcpy(tempbuf, state->wbuf, templen * sizeof(wchar_t));
            }
            else
              BEEP(); /* let the user know that nothing matched */
            replace_part(state, 0, buf);
          }
#ifdef USE_NOTMUCH
          else if (flags & MUTT_NM_QUERY)
          {
            mutt_mb_wcstombs(buf, buflen, state->wbuf, state->curpos);
            i = strlen(buf);
            if (!mutt_nm_query_complete(buf, buflen, i, state->tabs))
              BEEP();

            replace_part(state, 0, buf);
          }
          else if (flags & MUTT_NM_TAG)
          {
            mutt_mb_wcstombs(buf, buflen, state->wbuf, state->curpos);
            if (!mutt_nm_tag_complete(buf, buflen, state->tabs))
              BEEP();

            replace_part(state, 0, buf);
          }

#endif
          else
            goto self_insert;
          break;

        case OP_EDITOR_QUOTE_CHAR:
        {
          struct Event event;
          event = mutt_getch();
          if (event.ch >= 0)
          {
            LastKey = event.ch;
            goto self_insert;
          }
        }
        break;

        case OP_EDITOR_TRANSPOSE_CHARS:
          if (state->lastchar < 2)
            BEEP();
          else
          {
            wchar_t t;

            if (state->curpos == 0)
              state->curpos = 2;
            else if (state->curpos < state->lastchar)
              state->curpos++;

            t = state->wbuf[state->curpos - 2];
            state->wbuf[state->curpos - 2] = state->wbuf[state->curpos - 1];
            state->wbuf[state->curpos - 1] = t;
          }
          break;

        default:
          BEEP();
      }
    }
    else
    {
    self_insert:

      state->tabs = 0;
      /* use the raw keypress */
      ch = LastKey;

      /* quietly ignore all other function keys */
      if (ch & ~0xff)
        continue;

      /* gather the octets into a wide character */
      {
        char c;
        size_t k;

        c = ch;
        k = mbrtowc(&wc, &c, 1, &mbstate);
        if (k == (size_t)(-2))
          continue;
        else if (k && k != 1)
        {
          memset(&mbstate, 0, sizeof(mbstate));
          continue;
        }
      }

      if (first && (flags & MUTT_CLEAR))
      {
        first = 0;
        if (IsWPrint(wc)) /* why? */
          state->curpos = state->lastchar = 0;
      }

      if (wc == '\r' || wc == '\n')
      {
        /* Convert from wide characters */
        mutt_mb_wcstombs(buf, buflen, state->wbuf, state->lastchar);
        if (!pass)
          mutt_hist_add(hclass, buf, true);

        if (multiple)
        {
          char **tfiles = NULL;
          *numfiles = 1;
          tfiles = mutt_mem_calloc(*numfiles, sizeof(char *));
          mutt_expand_path(buf, buflen);
          tfiles[0] = mutt_str_strdup(buf);
          *files = tfiles;
        }
        rc = 0;
        goto bye;
      }
      else if (wc && (wc < ' ' || IsWPrint(wc))) /* why? */
      {
        if (state->lastchar >= state->wbuflen)
        {
          state->wbuflen = state->lastchar + 20;
          mutt_mem_realloc(&state->wbuf, state->wbuflen * sizeof(wchar_t));
        }
        memmove(state->wbuf + state->curpos + 1, state->wbuf + state->curpos,
                (state->lastchar - state->curpos) * sizeof(wchar_t));
        state->wbuf[state->curpos++] = wc;
        state->lastchar++;
      }
      else
      {
        mutt_flushinp();
        BEEP();
      }
    }
  }

bye:

  mutt_hist_reset_state(hclass);
  FREE(&tempbuf);
  return rc;
}

void mutt_free_enter_state(struct EnterState **esp)
{
  if (!esp)
    return;

  FREE(&(*esp)->wbuf);
  FREE(esp);
}

/*
 * TODO:
 * very narrow screen might crash it
 * sort out the input side
 * unprintable chars
 */