curs_lib.h File Reference

GUI miscellaneous curses (window drawing) routines. More...

#include <stdbool.h>
#include <stddef.h>
#include "browser/lib.h"
#include "key/lib.h"

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Data Structures
struct	FileCompletionData
	Input for the file completion function. More...

Functions
int	mutt_addwch (struct MuttWindow *win, wchar_t wc)
	Addwch would be provided by an up-to-date curses library.
int	mutt_any_key_to_continue (const char *s)
	Prompt the user to 'press any key' and wait.
void	mutt_beep (bool force)
	Irritate the user.
int	mw_enter_fname (const char *prompt, struct Buffer *fname, bool mailbox, struct Mailbox *m, bool multiple, char ***files, int *numfiles, SelectFileFlags flags)
	Ask the user to select a file -.
void	mutt_edit_file (const char *editor, const char *file)
	Let the user edit a file.
void	mutt_endwin (void)
	Shutdown curses.
void	mutt_flushinp (void)
	Empty all the keyboard buffers.
struct KeyEvent	mutt_getch (GetChFlags flags)
	Read a character from the input buffer.
void	mutt_need_hard_redraw (void)
	Force a hard refresh.
void	mutt_paddstr (struct MuttWindow *win, int n, const char *s)
	Display a string on screen, padded if necessary.
void	mutt_push_macro_event (int ch, int op)
	Add the character/operation to the macro buffer.
void	mutt_query_exit (void)
	Ask the user if they want to leave NeoMutt.
void	mutt_refresh (void)
	Force a refresh of the screen.
char *	mutt_str_expand_tabs (char *str, size_t *len, int tabwidth)
	Convert tabs to spaces in a string.
size_t	mutt_strwidth (const char *s)
	Measure a string's width in screen cells.
size_t	mutt_strnwidth (const char *s, size_t len)
	Measure a string's width in screen cells.
void	mutt_unget_ch (int ch)
	Return a keystroke to the input buffer.
void	mutt_unget_op (int op)
	Return an operation to the input buffer.
void	mutt_unget_string (const char *s)
	Return a string to the input buffer.
size_t	mutt_wstr_trunc (const char *src, size_t maxlen, size_t maxwid, size_t *width)
	Work out how to truncate a widechar string.
void	mw_what_key (void)
	Display the value of a key -.

Detailed Description

GUI miscellaneous curses (window drawing) routines.

Authors

• Richard Russon
• Pietro Cerutti

Copyright

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

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

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

Definition in file curs_lib.h.

Function Documentation

mutt_addwch()

int mutt_addwch	(	struct MuttWindow *	win,
		wchar_t	wc
	)

Addwch would be provided by an up-to-date curses library.

Parameters

win	Window
wc	Wide char to display

Return values

0	Success
-1	Error

Definition at line 320 of file curs_lib.c.

{
  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);
  }
}

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mutt_any_key_to_continue()

int mutt_any_key_to_continue

(

const char *

s

)

Prompt the user to 'press any key' and wait.

Parameters

s	Message prompt

Return values

num	Key pressed
EOF	Error, or prompt aborted

Definition at line 174 of file curs_lib.c.

{
  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;
}

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mutt_beep()

void mutt_beep

(

bool

force

)

Irritate the user.

Parameters

force

If true, ignore the "$beep" config variable

Definition at line 69 of file curs_lib.c.

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

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mutt_edit_file()

void mutt_edit_file	(	const char *	editor,
		const char *	file
	)

Let the user edit a file.

Parameters

editor	User's editor config
file	File to edit

Definition at line 117 of file curs_lib.c.

{
  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);
}

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mutt_endwin()

void mutt_endwin

(

void

)

Shutdown curses.

Definition at line 152 of file curs_lib.c.

{
  if (OptNoCurses)
    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;
}

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mutt_flushinp()

void mutt_flushinp

(

void

)

Empty all the keyboard buffers.

Definition at line 58 of file get.c.

{
  ARRAY_SHRINK(&UngetKeyEvents, ARRAY_SIZE(&UngetKeyEvents));
  ARRAY_SHRINK(&MacroEvents, ARRAY_SIZE(&MacroEvents));
  flushinp();
}

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mutt_getch()

struct KeyEvent mutt_getch

(

GetChFlags

flags

)

Read a character from the input buffer.

Parameters

flags

Flags, e.g. GETCH_IGNORE_MACRO

Return values

obj	KeyEvent to process

The priority for reading events is:

1. UngetKeyEvents buffer
2. MacroEvents buffer
3. Keyboard

This function can return:

• Abort { 0, OP_ABORT }
• Repaint { 0, OP_REPAINT }
• Timeout { 0, OP_TIMEOUT }

Definition at line 210 of file get.c.

{
  static const struct KeyEvent event_abort = { 0, OP_ABORT };
  static const struct KeyEvent event_repaint = { 0, OP_REPAINT };
  static const struct KeyEvent event_timeout = { 0, OP_TIMEOUT };
 
  if (OptNoCurses)
    return event_abort;
 
  struct KeyEvent *event_key = array_pop(&UngetKeyEvents);
  if (event_key)
    return *event_key;
 
  if (!(flags & GETCH_IGNORE_MACRO))
  {
    event_key = array_pop(&MacroEvents);
    if (event_key)
      return *event_key;
  }
 
  int ch;
  SigInt = false;
  mutt_sig_allow_interrupt(true);
  timeout(1000); // 1 second
#ifdef USE_INOTIFY
  ch = mutt_monitor_getch();
#else
  ch = getch();
#endif
  mutt_sig_allow_interrupt(false);
 
  if (SigInt)
  {
    mutt_query_exit();
    return event_abort;
  }
 
  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);
      return event_repaint;
    }
 
    notify_send(NeoMutt->notify_timeout, NT_TIMEOUT, 0, NULL);
    return event_timeout;
  }
 
  if (ch == AbortKey)
    return event_abort;
 
  if (ch & 0x80)
  {
    const bool c_meta_key = cs_subset_bool(NeoMutt->sub, "meta_key");
    if (c_meta_key)
    {
      /* send ALT-x as ESC-x */
      ch &= ~0x80;
      mutt_unget_ch(ch);
      return (struct KeyEvent) { '\033', OP_NULL }; // Escape
    }
  }
 
  return (struct KeyEvent) { ch, OP_NULL };
}

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mutt_need_hard_redraw()

void mutt_need_hard_redraw

(

void

)

Force a hard refresh.

Make sure that the next refresh does a full refresh. This could be optimized by not doing it at all if DISPLAY is set as this might indicate that a GUI based pinentry was used. Having an option to customize this is of course the NeoMutt way.

Definition at line 101 of file curs_lib.c.

{
  // 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);
}

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mutt_paddstr()

void mutt_paddstr	(	struct MuttWindow *	win,
		int	n,
		const char *	s
	)

Display a string on screen, padded if necessary.

Parameters

win	Window
n	Final width of field
s	String to display

Definition at line 343 of file curs_lib.c.

{
  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, ' ');
}

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mutt_push_macro_event()

void mutt_push_macro_event	(	int	ch,
		int	op
	)

Add the character/operation to the macro buffer.

Parameters

ch	Character to add
op	Operation to add

Adds the ch/op to the macro buffer. This should be used for macros, push, and exec commands only.

Definition at line 155 of file get.c.

{
  array_add(&MacroEvents, ch, op);
}

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mutt_query_exit()

void mutt_query_exit

(

void

)

Ask the user if they want to leave NeoMutt.

This function is called when the user presses the abort key.

Definition at line 138 of file curs_lib.c.

{
  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;
}

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mutt_refresh()

void mutt_refresh

(

void

)

Force a refresh of the screen.

Definition at line 79 of file curs_lib.c.

{
  /* 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();
}

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mutt_str_expand_tabs()

char * mutt_str_expand_tabs	(	char *	str,
		size_t *	len,
		int	tabwidth
	)

Convert tabs to spaces in a string.

Parameters

str	Input string
len	Length of the string
tabwidth	The number of spaces per indentation-level

Replace tab characters (\t) with spaces in the string. The string will be resized to fit the expanded version if necessary.

Definition at line 592 of file curs_lib.c.

{
  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;
}

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mutt_strwidth()

size_t mutt_strwidth

(

const char *

s

)

Measure a string's width in screen cells.

Parameters

s	String to be measured

Return values

num	Screen cells string would use

Definition at line 445 of file curs_lib.c.

{
  if (!s)
    return 0;
  return mutt_strnwidth(s, mutt_str_len(s));
}

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mutt_strnwidth()

size_t mutt_strnwidth	(	const char *	s,
		size_t	n
	)

Measure a string's width in screen cells.

Parameters

s	String to be measured
n	Length of string to be measured

Return values

num	Screen cells string would use

Definition at line 458 of file curs_lib.c.

{
  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;
}

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mutt_unget_ch()

void mutt_unget_ch

(

int

ch

)

Return a keystroke to the input buffer.

Parameters

ch

Key press

This puts events into the UngetKeyEvents buffer

Definition at line 115 of file get.c.

{
  array_add(&UngetKeyEvents, ch, OP_NULL);
}

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mutt_unget_op()

void mutt_unget_op

(

int

op

)

Return an operation to the input buffer.

Parameters

op	Operation, e.g. OP_DELETE

This puts events into the UngetKeyEvents buffer

Definition at line 126 of file get.c.

{
  array_add(&UngetKeyEvents, 0, op);
}

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mutt_unget_string()

void mutt_unget_string

(

const char *

s

)

Return a string to the input buffer.

Parameters

s	String to return

This puts events into the UngetKeyEvents buffer

Definition at line 137 of file get.c.

{
  const char *p = s + mutt_str_len(s) - 1;
 
  while (p >= s)
  {
    mutt_unget_ch((unsigned char) *p--);
  }
}

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mutt_wstr_trunc()

size_t mutt_wstr_trunc	(	const char *	src,
		size_t	maxlen,
		size_t	maxwid,
		size_t *	width
	)

Work out how to truncate a widechar string.

Parameters

[in]	src	String to measure
[in]	maxlen	Maximum length of string in bytes
[in]	maxwid	Maximum width in screen columns
[out]	width	Save the truncated screen column width

Return values

num	Bytes to use

See how many bytes to copy from string so it's at most maxlen bytes long and maxwid columns wide

Definition at line 385 of file curs_lib.c.

{
  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;
}

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