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/* m-x.c -- Meta-x minibuffer reader.
$Id: m-x.c,v 1.8 2008/06/11 09:55:42 gray Exp $
Copyright (C) 1993, 1997, 1998, 2001, 2002, 2004, 2007, 2008
Free Software Foundation, Inc.
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 3 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/>.
Originally written by Brian Fox (bfox@ai.mit.edu). */
#include "info.h"
#include "funs.h"
/* **************************************************************** */
/* */
/* Reading Named Commands */
/* */
/* **************************************************************** */
/* Read the name of an Info function in the echo area and return the
name. A return value of NULL indicates that no function name could
be read. */
char *
read_function_name (const char *prompt, WINDOW *window)
{
register int i;
char *line;
REFERENCE **array = NULL;
int array_index = 0, array_slots = 0;
/* Make an array of REFERENCE which actually contains the names of
the functions available in Info. */
for (i = 0; function_doc_array[i].func; i++)
{
REFERENCE *entry;
entry = xmalloc (sizeof (REFERENCE));
entry->label = xstrdup (function_doc_array[i].func_name);
entry->nodename = NULL;
entry->filename = NULL;
add_pointer_to_array
(entry, array_index, array, array_slots, 200, REFERENCE *);
}
line = info_read_completing_in_echo_area (window, prompt, array);
info_free_references (array);
if (!echo_area_is_active)
window_clear_echo_area ();
return line;
}
DECLARE_INFO_COMMAND (describe_command,
_("Read the name of an Info command and describe it"))
{
char *line;
line = read_function_name (_("Describe command: "), window);
if (!line)
{
info_abort_key (active_window, count, key);
return;
}
/* Describe the function named in "LINE". */
if (*line)
{
InfoCommand *cmd = named_function (line);
if (!cmd)
return;
window_message_in_echo_area ("%s: %s.",
line, function_documentation (cmd));
}
free (line);
}
DECLARE_INFO_COMMAND (info_execute_command,
_("Read a command name in the echo area and execute it"))
{
char *line;
char *keys;
char *prompt;
prompt = xmalloc (20);
keys = where_is (info_keymap, InfoCmd(info_execute_command));
/* If the where_is () function thinks that this command doesn't exist,
there's something very wrong! */
if (!keys)
abort();
if (info_explicit_arg || count != 1)
sprintf (prompt, "%d %s ", count, keys);
else
sprintf (prompt, "%s ", keys);
/* Ask the completer to read a reference for us. */
line = read_function_name (prompt, window);
/* User aborted? */
if (!line)
{
info_abort_key (active_window, count, key);
return;
}
/* User accepted "default"? (There is none.) */
if (!*line)
{
free (line);
return;
}
/* User wants to execute a named command. Do it. */
{
InfoCommand *command;
if ((active_window != the_echo_area) &&
(strncmp (line, "echo-area-", 10) == 0))
{
free (line);
info_error (_("Cannot execute an `echo-area' command here."),
NULL, NULL);
return;
}
command = named_function (line);
free (line);
if (!command)
return;
if (InfoFunction(command))
(*InfoFunction(command)) (active_window, count, 0);
else
info_error (_("Undefined command: %s"), line, NULL);
}
}
/* Okay, now that we have M-x, let the user set the screen height. */
DECLARE_INFO_COMMAND (set_screen_height,
_("Set the height of the displayed window"))
{
int new_height, old_height = screenheight;
if (info_explicit_arg || count != 1)
new_height = count;
else
{
char prompt[80];
char *line;
new_height = screenheight;
sprintf (prompt, _("Set screen height to (%d): "), new_height);
line = info_read_in_echo_area (window, prompt);
/* If the user aborted, do that now. */
if (!line)
{
info_abort_key (active_window, count, 0);
return;
}
/* Find out what the new height is supposed to be. */
if (*line)
new_height = atoi (line);
/* Clear the echo area if it isn't active. */
if (!echo_area_is_active)
window_clear_echo_area ();
free (line);
}
terminal_clear_screen ();
display_clear_display (the_display);
screenheight = new_height;
#ifdef SET_SCREEN_SIZE_HELPER
SET_SCREEN_SIZE_HELPER;
#endif
if (screenheight == old_height)
{
/* Display dimensions didn't actually change, so
window_new_screen_size won't do anything, but we've
already cleared the display above. Undo the damage. */
window_mark_chain (windows, W_UpdateWindow);
display_update_display (windows);
}
else
{
display_initialize_display (screenwidth, screenheight);
window_new_screen_size (screenwidth, screenheight);
}
}
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