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/* variables.c -- How to manipulate user visible variables in Info. */
/* This file is part of GNU Info, a program for reading online documentation
stored in Info format.
Copyright (C) 1993 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 2, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Written by Brian Fox (bfox@ai.mit.edu). */
#include "info.h"
#include "variables.h"
/* **************************************************************** */
/* */
/* User Visible Variables in Info */
/* */
/* **************************************************************** */
/* Choices used by the completer when reading a zero/non-zero value for
a variable. */
static char *on_off_choices[] = { "Off", "On", (char *)NULL };
VARIABLE_ALIST info_variables[] = {
{ "automatic-footnotes",
"When \"On\", footnotes appear and disappear automatically",
&auto_footnotes_p, (char **)on_off_choices },
{ "automatic-tiling",
"When \"On\", creating or deleting a window resizes other windows",
&auto_tiling_p, (char **)on_off_choices },
{ "visible-bell",
"When \"On\", flash the screen instead of ringing the bell",
&terminal_use_visible_bell_p, (char **)on_off_choices },
{ "errors-ring-bell",
"When \"On\", errors cause the bell to ring",
&info_error_rings_bell_p, (char **)on_off_choices },
{ "gc-compressed-files",
"When \"On\", Info garbage collects files which had to be uncompressed",
&gc_compressed_files, (char **)on_off_choices },
{ "show-index-match",
"When \"On\", the portion of the matched search string is highlighted",
&show_index_match, (char **)on_off_choices },
{ "scroll-behaviour",
"Controls what happens when scrolling is requested at the end of a node",
&info_scroll_behaviour, (char **)info_scroll_choices },
{ "scroll-step",
"The number lines to scroll when the cursor moves out of the window",
&window_scroll_step, (char **)NULL },
{ "ISO-Latin",
"When \"On\", Info accepts and displays ISO Latin characters",
&ISO_Latin_p, (char **)on_off_choices },
{ (char *)NULL, (char *)NULL, (int *)NULL, (char **)NULL }
};
DECLARE_INFO_COMMAND (describe_variable, "Explain the use of a variable")
{
VARIABLE_ALIST *var;
char *description;
/* Get the variable's name. */
var = read_variable_name ("Describe variable: ", window);
if (!var)
return;
description = (char *)xmalloc (20 + strlen (var->name) + strlen (var->doc));
if (var->choices)
sprintf (description, "%s (%s): %s.",
var->name, var->choices[*(var->value)], var->doc);
else
sprintf (description, "%s (%d): %s.", var->name, *(var->value), var->doc);
window_message_in_echo_area ("%s", description);
free (description);
}
DECLARE_INFO_COMMAND (set_variable, "Set the value of an Info variable")
{
VARIABLE_ALIST *var;
char *line;
/* Get the variable's name and value. */
var = read_variable_name ("Set variable: ", window);
if (!var)
return;
/* Read a new value for this variable. */
{
char prompt[100];
if (!var->choices)
{
int potential_value;
if (info_explicit_arg || count != 1)
potential_value = count;
else
potential_value = *(var->value);
sprintf (prompt, "Set %s to value (%d): ",
var->name, potential_value);
line = info_read_in_echo_area (active_window, prompt);
/* If no error was printed, clear the echo area. */
if (!info_error_was_printed)
window_clear_echo_area ();
/* User aborted? */
if (!line)
return;
/* If the user specified a value, get that, otherwise, we are done. */
canonicalize_whitespace (line);
if (*line)
*(var->value) = atoi (line);
else
*(var->value) = potential_value;
free (line);
}
else
{
register int i;
REFERENCE **array = (REFERENCE **)NULL;
int array_index = 0;
int array_slots = 0;
for (i = 0; var->choices[i]; i++)
{
REFERENCE *entry;
entry = (REFERENCE *)xmalloc (sizeof (REFERENCE));
entry->label = strdup (var->choices[i]);
entry->nodename = (char *)NULL;
entry->filename = (char *)NULL;
add_pointer_to_array
(entry, array_index, array, array_slots, 10, REFERENCE *);
}
sprintf (prompt, "Set %s to value (%s): ",
var->name, var->choices[*(var->value)]);
/* Ask the completer to read a variable value for us. */
line = info_read_completing_in_echo_area (window, prompt, array);
info_free_references (array);
if (!echo_area_is_active)
window_clear_echo_area ();
/* User aborted? */
if (!line)
{
info_abort_key (active_window, 0, 0);
return;
}
/* User accepted default choice? If so, no change. */
if (!*line)
{
free (line);
return;
}
/* Find the choice in our list of choices. */
for (i = 0; var->choices[i]; i++)
if (strcmp (var->choices[i], line) == 0)
break;
if (var->choices[i])
*(var->value) = i;
}
}
}
/* Read the name of an Info variable in the echo area and return the
address of a VARIABLE_ALIST member. A return value of NULL indicates
that no variable could be read. */
VARIABLE_ALIST *
read_variable_name (prompt, window)
char *prompt;
WINDOW *window;
{
register int i;
char *line;
REFERENCE **variables;
/* Get the completion array of variable names. */
variables = make_variable_completions_array ();
/* Ask the completer to read a variable for us. */
line =
info_read_completing_in_echo_area (window, prompt, variables);
info_free_references (variables);
if (!echo_area_is_active)
window_clear_echo_area ();
/* User aborted? */
if (!line)
{
info_abort_key (active_window, 0, 0);
return ((VARIABLE_ALIST *)NULL);
}
/* User accepted "default"? (There is none.) */
if (!*line)
{
free (line);
return ((VARIABLE_ALIST *)NULL);
}
/* Find the variable in our list of variables. */
for (i = 0; info_variables[i].name; i++)
if (strcmp (info_variables[i].name, line) == 0)
break;
if (!info_variables[i].name)
return ((VARIABLE_ALIST *)NULL);
else
return (&(info_variables[i]));
}
/* Make an array of REFERENCE which actually contains the names of the
variables available in Info. */
REFERENCE **
make_variable_completions_array ()
{
register int i;
REFERENCE **array = (REFERENCE **)NULL;
int array_index = 0, array_slots = 0;
for (i = 0; info_variables[i].name; i++)
{
REFERENCE *entry;
entry = (REFERENCE *)xmalloc (sizeof (REFERENCE));
entry->label = strdup (info_variables[i].name);
entry->nodename = (char *)NULL;
entry->filename = (char *)NULL;
add_pointer_to_array
(entry, array_index, array, array_slots, 200, REFERENCE *);
}
return (array);
}
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