curs_lib.c

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#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <wchar.h>
#include "mutt/lib.h"
#include "config/lib.h"
#include "core/lib.h"
#include "mutt.h"
#include "curs_lib.h"
#include "browser/lib.h"
#include "color/lib.h"
#include "editor/lib.h"
#include "history/lib.h"
#include "key/lib.h"
#include "question/lib.h"
#include "globals.h"
#include "msgcont.h"
#include "msgwin.h"
#include "mutt_curses.h"
#include "mutt_logging.h"
#include "mutt_window.h"
#include "opcodes.h"
#include "thread.h"

void mutt_beep(bool force)
{
  const bool c_beep = cs_subset_bool(NeoMutt->sub, "beep");
  if (force || c_beep)
    beep();
}

void mutt_refresh(void)
{
  /* don't refresh when we are waiting for a child. */
  if (OptKeepQuiet)
    return;
 
  /* don't refresh in the middle of macros unless necessary */
  if (!ARRAY_EMPTY(&MacroEvents) && !OptForceRefresh)
    return;
 
  /* else */
  refresh();
}

void mutt_need_hard_redraw(void)
{
  // Forcibly switch to the alternate screen.
  // Using encryption can leave ncurses confused about which mode it's in.
  fputs("\033[?1049h", stdout);
  fflush(stdout);
  keypad(stdscr, true);
  clearok(stdscr, true);
  window_redraw(NULL);
}

void mutt_edit_file(const char *editor, const char *file)
{
  struct Buffer *cmd = buf_pool_get();
 
  mutt_endwin();
  buf_file_expand_fmt_quote(cmd, editor, file);
  if (mutt_system(buf_string(cmd)) != 0)
  {
    mutt_error(_("Error running \"%s\""), buf_string(cmd));
  }
  /* the terminal may have been resized while the editor owned it */
  mutt_resize_screen();
 
  buf_pool_release(&cmd);
}

void mutt_query_exit(void)
{
  mutt_flushinp();
  if (query_yesorno(_("Exit NeoMutt without saving?"), MUTT_YES) == MUTT_YES)
  {
    mutt_exit(0); /* This call never returns */
  }
  mutt_clear_error();
  SigInt = false;
}

void mutt_endwin(void)
{
  if (!OptGui)
    return;
 
  int e = errno;
 
  /* at least in some situations (screen + xterm under SuSE11/12) endwin()
   * doesn't properly flush the screen without an explicit call.  */
  mutt_refresh();
  endwin();
  SigWinch = true;
 
  errno = e;
}

int mutt_any_key_to_continue(const char *s)
{
  struct termios term = { 0 };
  struct termios old = { 0 };
 
  int fd = open("/dev/tty", O_RDONLY);
  if (fd < 0)
    return EOF;
 
  tcgetattr(fd, &old); // Save the current tty settings
 
  term = old;
  term.c_lflag &= ~(ICANON | ECHO); // Canonical (not line-buffered), don't echo the characters
  term.c_cc[VMIN] = 1;    // Wait for at least one character
  term.c_cc[VTIME] = 255; // Wait for 25.5s
  tcsetattr(fd, TCSANOW, &term);
 
  if (s)
    fputs(s, stdout);
  else
    fputs(_("Press any key to continue..."), stdout);
  fflush(stdout);
 
  char ch = '\0';
  // Wait for a character.  This might timeout, so loop.
  while (read(fd, &ch, 1) == 0)
    ; // do nothing
 
  // Change the tty settings to be non-blocking
  term.c_cc[VMIN] = 0;  // Returning with zero characters is acceptable
  term.c_cc[VTIME] = 0; // Don't wait
  tcsetattr(fd, TCSANOW, &term);
 
  char buf[64] = { 0 };
  while (read(fd, buf, sizeof(buf)) > 0)
    ; // Mop up any remaining chars
 
  tcsetattr(fd, TCSANOW, &old); // Restore the previous tty settings
  close(fd);
 
  fputs("\r\n", stdout);
  mutt_clear_error();
  return (ch >= 0) ? ch : EOF;
}

int mw_enter_fname(const char *prompt, struct Buffer *fname, bool mailbox,
                   struct Mailbox *m, bool multiple, char ***files,
                   int *numfiles, SelectFileFlags flags)
{
  struct MuttWindow *win = msgwin_new(true);
  if (!win)
    return -1;
 
  int rc = -1;
 
  struct Buffer *text = buf_pool_get();
  const struct AttrColor *ac_normal = simple_color_get(MT_COLOR_NORMAL);
  const struct AttrColor *ac_prompt = merged_color_overlay(ac_normal,
                                                           simple_color_get(MT_COLOR_PROMPT));
 
  msgwin_add_text(win, prompt, ac_prompt);
  msgwin_add_text(win, _(" ('?' for list): "), ac_prompt);
  if (!buf_is_empty(fname))
    msgwin_add_text(win, buf_string(fname), ac_normal);
 
  msgcont_push_window(win);
  struct MuttWindow *old_focus = window_set_focus(win);
 
  struct KeyEvent event = { 0, OP_NULL };
  do
  {
    window_redraw(NULL);
    event = mutt_getch(GETCH_NO_FLAGS);
  } while ((event.op == OP_TIMEOUT) || (event.op == OP_REPAINT));
 
  mutt_refresh();
  win = msgcont_pop_window();
  window_set_focus(old_focus);
  mutt_window_free(&win);
 
  if (event.ch < 0)
    goto done;
 
  if (event.ch == '?')
  {
    buf_reset(fname);
 
    if (flags == MUTT_SEL_NO_FLAGS)
      flags = MUTT_SEL_FOLDER;
    if (multiple)
      flags |= MUTT_SEL_MULTI;
    if (mailbox)
      flags |= MUTT_SEL_MAILBOX;
    dlg_browser(fname, flags, m, files, numfiles);
  }
  else
  {
    char *pc = NULL;
    mutt_str_asprintf(&pc, "%s: ", prompt);
    if (event.op == OP_NULL)
      mutt_unget_ch(event.ch);
    else
      mutt_unget_op(event.op);
 
    buf_alloc(fname, 1024);
    struct FileCompletionData cdata = { multiple, m, files, numfiles, NULL };
    enum HistoryClass hclass = mailbox ? HC_MAILBOX : HC_FILE;
    if (mw_get_field(pc, fname, MUTT_COMP_CLEAR, hclass, &CompleteMailboxOps, &cdata) != 0)
    {
      buf_reset(fname);
    }
    FREE(&pc);
  }
 
  rc = 0;
 
done:
  buf_pool_release(&text);
  return rc;
}

int mutt_addwch(struct MuttWindow *win, wchar_t wc)
{
  char buf[MB_LEN_MAX * 2];
  mbstate_t mbstate = { 0 };
  size_t n1, n2;
 
  if (((n1 = wcrtomb(buf, wc, &mbstate)) == ICONV_ILLEGAL_SEQ) ||
      ((n2 = wcrtomb(buf + n1, 0, &mbstate)) == ICONV_ILLEGAL_SEQ))
  {
    return -1; /* ERR */
  }
  else
  {
    return mutt_window_addstr(win, buf);
  }
}

void mutt_paddstr(struct MuttWindow *win, int n, const char *s)
{
  wchar_t wc = 0;
  size_t k;
  size_t len = mutt_str_len(s);
  mbstate_t mbstate = { 0 };
 
  for (; len && (k = mbrtowc(&wc, s, len, &mbstate)); s += k, len -= k)
  {
    if ((k == ICONV_ILLEGAL_SEQ) || (k == ICONV_BUF_TOO_SMALL))
    {
      if (k == ICONV_ILLEGAL_SEQ)
        memset(&mbstate, 0, sizeof(mbstate));
      k = (k == ICONV_ILLEGAL_SEQ) ? 1 : len;
      wc = ReplacementChar;
    }
    if (!IsWPrint(wc))
      wc = '?';
    const int w = wcwidth(wc);
    if (w >= 0)
    {
      if (w > n)
        break;
      mutt_addwch(win, wc);
      n -= w;
    }
  }
  while (n-- > 0)
    mutt_window_addch(win, ' ');
}

size_t mutt_wstr_trunc(const char *src, size_t maxlen, size_t maxwid, size_t *width)
{
  wchar_t wc = 0;
  size_t n, w = 0, l = 0, cl;
  int cw;
  mbstate_t mbstate = { 0 };
 
  if (!src)
    goto out;
 
  n = mutt_str_len(src);
 
  for (w = 0; n && (cl = mbrtowc(&wc, src, n, &mbstate)); src += cl, n -= cl)
  {
    if (cl == ICONV_ILLEGAL_SEQ)
    {
      memset(&mbstate, 0, sizeof(mbstate));
      cl = 1;
      wc = ReplacementChar;
    }
    else if (cl == ICONV_BUF_TOO_SMALL)
    {
      cl = n;
      wc = ReplacementChar;
    }
 
    cw = wcwidth(wc);
    /* hack because MUTT_TREE symbols aren't turned into characters
     * until rendered by print_enriched_string() */
    if ((cw < 0) && (src[0] == MUTT_SPECIAL_INDEX))
    {
      cl = 2; /* skip the index coloring sequence */
      cw = 0;
    }
    else if ((cw < 0) && (cl == 1) && (src[0] != '\0') && (src[0] < MUTT_TREE_MAX))
    {
      cw = 1;
    }
    else if (cw < 0)
    {
      cw = 0; /* unprintable wchar */
    }
    if (wc == '\n')
      break;
    if (((cl + l) > maxlen) || ((cw + w) > maxwid))
      break;
    l += cl;
    w += cw;
  }
out:
  if (width)
    *width = w;
  return l;
}

size_t mutt_strwidth(const char *s)
{
  if (!s)
    return 0;
  return mutt_strnwidth(s, mutt_str_len(s));
}

size_t mutt_strnwidth(const char *s, size_t n)
{
  if (!s)
    return 0;
 
  wchar_t wc = 0;
  int w;
  size_t k;
  mbstate_t mbstate = { 0 };
 
  for (w = 0; n && (k = mbrtowc(&wc, s, n, &mbstate)); s += k, n -= k)
  {
    if (*s == MUTT_SPECIAL_INDEX)
    {
      s += 2; /* skip the index coloring sequence */
      k = 0;
      continue;
    }
 
    if ((k == ICONV_ILLEGAL_SEQ) || (k == ICONV_BUF_TOO_SMALL))
    {
      if (k == ICONV_ILLEGAL_SEQ)
        memset(&mbstate, 0, sizeof(mbstate));
      k = (k == ICONV_ILLEGAL_SEQ) ? 1 : n;
      wc = ReplacementChar;
    }
    if (!IsWPrint(wc))
      wc = '?';
    w += wcwidth(wc);
  }
  return w;
}

void mw_what_key(void)
{
  struct MuttWindow *win = msgwin_new(true);
  if (!win)
    return;
 
  struct Buffer *key = buf_pool_get();
  struct Buffer *prompt = buf_pool_get();
  struct Buffer *text = buf_pool_get();
 
  keymap_get_name(AbortKey, key);
 
  buf_printf(prompt, _("Enter keys (%s to abort): "), buf_string(key));
  msgwin_set_text(win, buf_string(prompt), MT_COLOR_PROMPT);
 
  msgcont_push_window(win);
  struct MuttWindow *old_focus = window_set_focus(win);
  window_redraw(win);
 
  const struct AttrColor *ac_normal = simple_color_get(MT_COLOR_NORMAL);
  const struct AttrColor *ac_prompt = simple_color_get(MT_COLOR_PROMPT);
 
  // ---------------------------------------------------------------------------
  // Event Loop
  timeout(1000); // 1 second
  while (true)
  {
    int ch = getch();
    if (ch == AbortKey)
      break;
 
    if (ch == KEY_RESIZE)
    {
      timeout(0);
      while ((ch = getch()) == KEY_RESIZE)
      {
        // do nothing
      }
    }
 
    if (ch == ERR)
    {
      if (!isatty(STDIN_FILENO)) // terminal was lost
        mutt_exit(1);
 
      if (SigWinch)
      {
        SigWinch = false;
        notify_send(NeoMutt->notify_resize, NT_RESIZE, 0, NULL);
        window_redraw(NULL);
      }
      else
      {
        notify_send(NeoMutt->notify_timeout, NT_TIMEOUT, 0, NULL);
      }
 
      continue;
    }
 
    msgwin_clear_text(win);
 
    buf_reset(key);
    keymap_get_name(ch, key);
 
    buf_printf(text, _("Char = %s, Octal = %o, Decimal = %d\n"), buf_string(key), ch, ch);
 
    msgwin_add_text(win, buf_string(text), ac_normal);
    msgwin_add_text(win, buf_string(prompt), ac_prompt);
    msgwin_add_text(win, NULL, NULL);
    window_redraw(NULL);
  }
  // ---------------------------------------------------------------------------
 
  buf_pool_release(&key);
  buf_pool_release(&prompt);
  buf_pool_release(&text);
 
  win = msgcont_pop_window();
  window_set_focus(old_focus);
  mutt_window_free(&win);
}

char *mutt_str_expand_tabs(char *str, size_t *len, int tabwidth)
{
  if (!str || !len || (tabwidth < 1))
    return NULL;
 
  // calculate how much space we need
  size_t required_len = 0;
  for (int i = 0; (i < *len) && (str[i] != '\0'); i++)
  {
    if (str[i] == '\t')
      required_len += tabwidth; // cheat, just assume full tab width
    else
      required_len++;
  }
 
  // resize the string if there isn't enough space
  while (required_len > *len)
  {
    *len += 256;
    MUTT_MEM_REALLOC(&str, *len, char);
  }
 
  // expand tabs
  for (int i = 0; i < *len; i++)
  {
    if (str[i] == '\t')
    {
      int num_cells = mutt_strnwidth(str, i);
      int indent = abs((num_cells % tabwidth) - tabwidth);
      memmove(str + i + indent, str + i + 1, *len - (i + indent) - indent);
      memset(str + i, ' ', indent);
    }
  }
 
  return str;
}