276 lines
8.0 KiB
C
276 lines
8.0 KiB
C
/* variables.c -- How to manipulate user visible variables in Info.
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$Id: variables.c,v 1.1.1.2 1998/03/22 20:43:01 law Exp $
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This file is part of GNU Info, a program for reading online documentation
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stored in Info format.
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Copyright (C) 1993, 97 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Written by Brian Fox (bfox@ai.mit.edu). */
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#include "info.h"
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#include "variables.h"
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/* **************************************************************** */
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/* */
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/* User Visible Variables in Info */
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/* */
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/* **************************************************************** */
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/* Choices used by the completer when reading a zero/non-zero value for
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a variable. */
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static char *on_off_choices[] = { "Off", "On", (char *)NULL };
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VARIABLE_ALIST info_variables[] = {
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{ "automatic-footnotes",
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N_("When \"On\", footnotes appear and disappear automatically"),
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&auto_footnotes_p, (char **)on_off_choices },
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{ "automatic-tiling",
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N_("When \"On\", creating or deleting a window resizes other windows"),
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&auto_tiling_p, (char **)on_off_choices },
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{ "visible-bell",
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N_("When \"On\", flash the screen instead of ringing the bell"),
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&terminal_use_visible_bell_p, (char **)on_off_choices },
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{ "errors-ring-bell",
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N_("When \"On\", errors cause the bell to ring"),
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&info_error_rings_bell_p, (char **)on_off_choices },
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{ "gc-compressed-files",
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N_("When \"On\", Info garbage collects files which had to be uncompressed"),
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&gc_compressed_files, (char **)on_off_choices },
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{ "show-index-match",
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N_("When \"On\", the portion of the matched search string is highlighted"),
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&show_index_match, (char **)on_off_choices },
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{ "scroll-behaviour",
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N_("Controls what happens when scrolling is requested at the end of a node"),
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&info_scroll_behaviour, (char **)info_scroll_choices },
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{ "scroll-step",
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N_("The number lines to scroll when the cursor moves out of the window"),
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&window_scroll_step, (char **)NULL },
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{ "ISO-Latin",
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N_("When \"On\", Info accepts and displays ISO Latin characters"),
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&ISO_Latin_p, (char **)on_off_choices },
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{ (char *)NULL, (char *)NULL, (int *)NULL, (char **)NULL }
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};
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DECLARE_INFO_COMMAND (describe_variable, _("Explain the use of a variable"))
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{
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VARIABLE_ALIST *var;
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char *description;
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/* Get the variable's name. */
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var = read_variable_name (_("Describe variable: "), window);
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if (!var)
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return;
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description = (char *)xmalloc (20 + strlen (var->name)
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+ strlen (_(var->doc)));
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if (var->choices)
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sprintf (description, "%s (%s): %s.",
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var->name, var->choices[*(var->value)], _(var->doc));
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else
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sprintf (description, "%s (%d): %s.",
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var->name, *(var->value), _(var->doc));
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window_message_in_echo_area ("%s", description);
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free (description);
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}
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DECLARE_INFO_COMMAND (set_variable, _("Set the value of an Info variable"))
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{
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VARIABLE_ALIST *var;
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char *line;
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/* Get the variable's name and value. */
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var = read_variable_name (_("Set variable: "), window);
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if (!var)
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return;
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/* Read a new value for this variable. */
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{
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char prompt[100];
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if (!var->choices)
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{
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int potential_value;
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if (info_explicit_arg || count != 1)
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potential_value = count;
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else
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potential_value = *(var->value);
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sprintf (prompt, _("Set %s to value (%d): "),
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var->name, potential_value);
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line = info_read_in_echo_area (active_window, prompt);
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/* If no error was printed, clear the echo area. */
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if (!info_error_was_printed)
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window_clear_echo_area ();
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/* User aborted? */
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if (!line)
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return;
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/* If the user specified a value, get that, otherwise, we are done. */
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canonicalize_whitespace (line);
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if (*line)
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*(var->value) = atoi (line);
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else
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*(var->value) = potential_value;
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free (line);
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}
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else
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{
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register int i;
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REFERENCE **array = (REFERENCE **)NULL;
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int array_index = 0;
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int array_slots = 0;
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for (i = 0; var->choices[i]; i++)
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{
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REFERENCE *entry;
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entry = (REFERENCE *)xmalloc (sizeof (REFERENCE));
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entry->label = xstrdup (var->choices[i]);
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entry->nodename = (char *)NULL;
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entry->filename = (char *)NULL;
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add_pointer_to_array
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(entry, array_index, array, array_slots, 10, REFERENCE *);
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}
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sprintf (prompt, _("Set %s to value (%s): "),
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var->name, var->choices[*(var->value)]);
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/* Ask the completer to read a variable value for us. */
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line = info_read_completing_in_echo_area (window, prompt, array);
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info_free_references (array);
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if (!echo_area_is_active)
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window_clear_echo_area ();
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/* User aborted? */
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if (!line)
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{
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info_abort_key (active_window, 0, 0);
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return;
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}
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/* User accepted default choice? If so, no change. */
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if (!*line)
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{
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free (line);
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return;
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}
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/* Find the choice in our list of choices. */
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for (i = 0; var->choices[i]; i++)
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if (strcmp (var->choices[i], line) == 0)
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break;
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if (var->choices[i])
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*(var->value) = i;
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}
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}
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}
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/* Read the name of an Info variable in the echo area and return the
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address of a VARIABLE_ALIST member. A return value of NULL indicates
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that no variable could be read. */
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VARIABLE_ALIST *
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read_variable_name (prompt, window)
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char *prompt;
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WINDOW *window;
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{
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register int i;
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char *line;
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REFERENCE **variables;
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/* Get the completion array of variable names. */
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variables = make_variable_completions_array ();
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/* Ask the completer to read a variable for us. */
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line =
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info_read_completing_in_echo_area (window, prompt, variables);
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info_free_references (variables);
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if (!echo_area_is_active)
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window_clear_echo_area ();
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/* User aborted? */
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if (!line)
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{
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info_abort_key (active_window, 0, 0);
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return ((VARIABLE_ALIST *)NULL);
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}
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/* User accepted "default"? (There is none.) */
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if (!*line)
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{
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free (line);
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return ((VARIABLE_ALIST *)NULL);
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}
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/* Find the variable in our list of variables. */
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for (i = 0; info_variables[i].name; i++)
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if (strcmp (info_variables[i].name, line) == 0)
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break;
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if (!info_variables[i].name)
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return ((VARIABLE_ALIST *)NULL);
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else
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return (&(info_variables[i]));
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}
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/* Make an array of REFERENCE which actually contains the names of the
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variables available in Info. */
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REFERENCE **
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make_variable_completions_array ()
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{
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register int i;
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REFERENCE **array = (REFERENCE **)NULL;
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int array_index = 0, array_slots = 0;
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for (i = 0; info_variables[i].name; i++)
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{
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REFERENCE *entry;
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entry = (REFERENCE *) xmalloc (sizeof (REFERENCE));
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entry->label = xstrdup (info_variables[i].name);
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entry->nodename = (char *)NULL;
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entry->filename = (char *)NULL;
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add_pointer_to_array
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(entry, array_index, array, array_slots, 200, REFERENCE *);
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}
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return (array);
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}
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