xed/plugins/modelines/modeline-parser.c

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/*
* modeline-parser.c
* Emacs, Kate and Vim-style modelines support for xed.
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*
* Copyright (C) 2005-2007 - Steve Frécinaux <code@istique.net>
*
* 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
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <gtk/gtk.h>
#include <gtksourceview/gtksource.h>
#include <xed/xed-language-manager.h>
#include <xed/xed-prefs-manager.h>
#include <xed/xed-debug.h>
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#include "modeline-parser.h"
#define MODELINES_LANGUAGE_MAPPINGS_FILE "language-mappings"
/* base dir to lookup configuration files */
static gchar *modelines_data_dir;
/* Mappings: language name -> Xed language ID */
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static GHashTable *vim_languages;
static GHashTable *emacs_languages;
static GHashTable *kate_languages;
typedef enum
{
MODELINE_SET_NONE = 0,
MODELINE_SET_TAB_WIDTH = 1 << 0,
MODELINE_SET_INDENT_WIDTH = 1 << 1,
MODELINE_SET_WRAP_MODE = 1 << 2,
MODELINE_SET_SHOW_RIGHT_MARGIN = 1 << 3,
MODELINE_SET_RIGHT_MARGIN_POSITION = 1 << 4,
MODELINE_SET_LANGUAGE = 1 << 5,
MODELINE_SET_INSERT_SPACES = 1 << 6
} ModelineSet;
typedef struct _ModelineOptions
{
gchar *language_id;
/* these options are similar to the GtkSourceView properties of the
* same names.
*/
gboolean insert_spaces;
guint tab_width;
guint indent_width;
GtkWrapMode wrap_mode;
gboolean display_right_margin;
guint right_margin_position;
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ModelineSet set;
} ModelineOptions;
#define MODELINE_OPTIONS_DATA_KEY "ModelineOptionsDataKey"
static gboolean
has_option (ModelineOptions *options,
ModelineSet set)
{
return options->set & set;
}
void
modeline_parser_init (const gchar *data_dir)
{
if (modelines_data_dir == NULL)
{
modelines_data_dir = g_strdup (data_dir);
}
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}
void
modeline_parser_shutdown ()
{
if (vim_languages != NULL)
g_hash_table_destroy (vim_languages);
if (emacs_languages != NULL)
g_hash_table_destroy (emacs_languages);
if (kate_languages != NULL)
g_hash_table_destroy (kate_languages);
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vim_languages = NULL;
emacs_languages = NULL;
kate_languages = NULL;
g_free (modelines_data_dir);
modelines_data_dir = NULL;
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}
static GHashTable *
load_language_mappings_group (GKeyFile *key_file, const gchar *group)
{
GHashTable *table;
gchar **keys;
gsize length = 0;
int i;
table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
keys = g_key_file_get_keys (key_file, group, &length, NULL);
xed_debug_message (DEBUG_PLUGINS,
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"%" G_GSIZE_FORMAT " mappings in group %s",
length, group);
for (i = 0; i < length; i++)
{
gchar *name = keys[i];
gchar *id = g_key_file_get_string (key_file, group, name, NULL);
g_hash_table_insert (table, name, id);
}
g_free (keys);
return table;
}
/* lazy loading of language mappings */
static void
load_language_mappings (void)
{
gchar *fname;
GKeyFile *mappings;
GError *error = NULL;
fname = g_build_filename (modelines_data_dir,
MODELINES_LANGUAGE_MAPPINGS_FILE,
NULL);
mappings = g_key_file_new ();
if (g_key_file_load_from_file (mappings, fname, 0, &error))
{
xed_debug_message (DEBUG_PLUGINS,
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"Loaded language mappings from %s",
fname);
vim_languages = load_language_mappings_group (mappings, "vim");
emacs_languages = load_language_mappings_group (mappings, "emacs");
kate_languages = load_language_mappings_group (mappings, "kate");
}
else
{
xed_debug_message (DEBUG_PLUGINS,
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"Failed to loaded language mappings from %s: %s",
fname, error->message);
g_error_free (error);
}
g_key_file_free (mappings);
g_free (fname);
}
static gchar *
get_language_id (const gchar *language_name, GHashTable *mapping)
{
gchar *name;
gchar *language_id;
name = g_ascii_strdown (language_name, -1);
language_id = g_hash_table_lookup (mapping, name);
if (language_id != NULL)
{
g_free (name);
return g_strdup (language_id);
}
else
{
/* by default assume that the gtksourcevuew id is the same */
return name;
}
}
static gchar *
get_language_id_vim (const gchar *language_name)
{
if (vim_languages == NULL)
load_language_mappings ();
return get_language_id (language_name, vim_languages);
}
static gchar *
get_language_id_emacs (const gchar *language_name)
{
if (emacs_languages == NULL)
load_language_mappings ();
return get_language_id (language_name, emacs_languages);
}
static gchar *
get_language_id_kate (const gchar *language_name)
{
if (kate_languages == NULL)
load_language_mappings ();
return get_language_id (language_name, kate_languages);
}
static gboolean
skip_whitespaces (gchar **s)
{
while (**s != '\0' && g_ascii_isspace (**s))
(*s)++;
return **s != '\0';
}
/* Parse vi(m) modelines.
* Vi(m) modelines looks like this:
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* - first form: [text]{white}{vi:|vim:|ex:}[white]{options}
* - second form: [text]{white}{vi:|vim:|ex:}[white]se[t] {options}:[text]
* They can happen on the three first or last lines.
*/
static gchar *
parse_vim_modeline (gchar *s,
ModelineOptions *options)
{
gboolean in_set = FALSE;
gboolean neg;
guint intval;
GString *key, *value;
key = g_string_sized_new (8);
value = g_string_sized_new (8);
while (*s != '\0' && !(in_set && *s == ':'))
{
while (*s != '\0' && (*s == ':' || g_ascii_isspace (*s)))
s++;
if (*s == '\0')
break;
if (strncmp (s, "set ", 4) == 0 ||
strncmp (s, "se ", 3) == 0)
{
s = strchr(s, ' ') + 1;
in_set = TRUE;
}
neg = FALSE;
if (strncmp (s, "no", 2) == 0)
{
neg = TRUE;
s += 2;
}
g_string_assign (key, "");
g_string_assign (value, "");
while (*s != '\0' && *s != ':' && *s != '=' &&
!g_ascii_isspace (*s))
{
g_string_append_c (key, *s);
s++;
}
if (*s == '=')
{
s++;
while (*s != '\0' && *s != ':' &&
!g_ascii_isspace (*s))
{
g_string_append_c (value, *s);
s++;
}
}
if (strcmp (key->str, "ft") == 0 ||
strcmp (key->str, "filetype") == 0)
{
g_free (options->language_id);
options->language_id = get_language_id_vim (value->str);
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options->set |= MODELINE_SET_LANGUAGE;
}
else if (strcmp (key->str, "et") == 0 ||
strcmp (key->str, "expandtab") == 0)
{
options->insert_spaces = !neg;
options->set |= MODELINE_SET_INSERT_SPACES;
}
else if (strcmp (key->str, "ts") == 0 ||
strcmp (key->str, "tabstop") == 0)
{
intval = atoi (value->str);
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if (intval)
{
options->tab_width = intval;
options->set |= MODELINE_SET_TAB_WIDTH;
}
}
else if (strcmp (key->str, "sw") == 0 ||
strcmp (key->str, "shiftwidth") == 0)
{
intval = atoi (value->str);
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if (intval)
{
options->indent_width = intval;
options->set |= MODELINE_SET_INDENT_WIDTH;
}
}
else if (strcmp (key->str, "wrap") == 0)
{
options->wrap_mode = neg ? GTK_WRAP_NONE : GTK_WRAP_WORD;
options->set |= MODELINE_SET_WRAP_MODE;
}
else if (strcmp (key->str, "textwidth") == 0 || strcmp (key->str, "tw") == 0)
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{
intval = atoi (value->str);
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if (intval)
{
options->right_margin_position = intval;
options->display_right_margin = TRUE;
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options->set |= MODELINE_SET_SHOW_RIGHT_MARGIN |
MODELINE_SET_RIGHT_MARGIN_POSITION;
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}
}
}
g_string_free (key, TRUE);
g_string_free (value, TRUE);
return s;
}
/* Parse emacs modelines.
* Emacs modelines looks like this: "-*- key1: value1; key2: value2 -*-"
* They can happen on the first line, or on the second one if the first line is
* a shebang (#!)
* See http://www.delorie.com/gnu/docs/emacs/emacs_486.html
*/
static gchar *
parse_emacs_modeline (gchar *s,
ModelineOptions *options)
{
guint intval;
GString *key, *value;
key = g_string_sized_new (8);
value = g_string_sized_new (8);
while (*s != '\0')
{
while (*s != '\0' && (*s == ';' || g_ascii_isspace (*s)))
s++;
if (*s == '\0' || strncmp (s, "-*-", 3) == 0)
break;
g_string_assign (key, "");
g_string_assign (value, "");
while (*s != '\0' && *s != ':' && *s != ';' &&
!g_ascii_isspace (*s))
{
g_string_append_c (key, *s);
s++;
}
if (!skip_whitespaces (&s))
break;
if (*s != ':')
continue;
s++;
if (!skip_whitespaces (&s))
break;
while (*s != '\0' && *s != ';' && !g_ascii_isspace (*s))
{
g_string_append_c (value, *s);
s++;
}
xed_debug_message (DEBUG_PLUGINS,
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"Emacs modeline bit: %s = %s",
key->str, value->str);
/* "Mode" key is case insenstive */
if (g_ascii_strcasecmp (key->str, "Mode") == 0)
{
g_free (options->language_id);
options->language_id = get_language_id_emacs (value->str);
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options->set |= MODELINE_SET_LANGUAGE;
}
else if (strcmp (key->str, "tab-width") == 0)
{
intval = atoi (value->str);
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if (intval)
{
options->tab_width = intval;
options->set |= MODELINE_SET_TAB_WIDTH;
}
}
else if (strcmp (key->str, "indent-offset") == 0)
{
intval = atoi (value->str);
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if (intval)
{
options->indent_width = intval;
options->set |= MODELINE_SET_INDENT_WIDTH;
}
}
else if (strcmp (key->str, "indent-tabs-mode") == 0)
{
intval = strcmp (value->str, "nil") == 0;
options->insert_spaces = intval;
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options->set |= MODELINE_SET_INSERT_SPACES;
}
else if (strcmp (key->str, "autowrap") == 0)
{
intval = strcmp (value->str, "nil") != 0;
options->wrap_mode = intval ? GTK_WRAP_WORD : GTK_WRAP_NONE;
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options->set |= MODELINE_SET_WRAP_MODE;
}
}
g_string_free (key, TRUE);
g_string_free (value, TRUE);
return *s == '\0' ? s : s + 2;
}
/*
* Parse kate modelines.
* Kate modelines are of the form "kate: key1 value1; key2 value2;"
* These can happen on the 10 first or 10 last lines of the buffer.
* See http://wiki.kate-editor.org/index.php/Modelines
*/
static gchar *
parse_kate_modeline (gchar *s,
ModelineOptions *options)
{
guint intval;
GString *key, *value;
key = g_string_sized_new (8);
value = g_string_sized_new (8);
while (*s != '\0')
{
while (*s != '\0' && (*s == ';' || g_ascii_isspace (*s)))
s++;
if (*s == '\0')
break;
g_string_assign (key, "");
g_string_assign (value, "");
while (*s != '\0' && *s != ';' && !g_ascii_isspace (*s))
{
g_string_append_c (key, *s);
s++;
}
if (!skip_whitespaces (&s))
break;
if (*s == ';')
continue;
while (*s != '\0' && *s != ';' &&
!g_ascii_isspace (*s))
{
g_string_append_c (value, *s);
s++;
}
xed_debug_message (DEBUG_PLUGINS,
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"Kate modeline bit: %s = %s",
key->str, value->str);
if (strcmp (key->str, "hl") == 0 ||
strcmp (key->str, "syntax") == 0)
{
g_free (options->language_id);
options->language_id = get_language_id_kate (value->str);
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options->set |= MODELINE_SET_LANGUAGE;
}
else if (strcmp (key->str, "tab-width") == 0)
{
intval = atoi (value->str);
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if (intval)
{
options->tab_width = intval;
options->set |= MODELINE_SET_TAB_WIDTH;
}
}
else if (strcmp (key->str, "indent-width") == 0)
{
intval = atoi (value->str);
if (intval) options->indent_width = intval;
}
else if (strcmp (key->str, "space-indent") == 0)
{
intval = strcmp (value->str, "on") == 0 ||
strcmp (value->str, "true") == 0 ||
strcmp (value->str, "1") == 0;
options->insert_spaces = intval;
options->set |= MODELINE_SET_INSERT_SPACES;
}
else if (strcmp (key->str, "word-wrap") == 0)
{
intval = strcmp (value->str, "on") == 0 ||
strcmp (value->str, "true") == 0 ||
strcmp (value->str, "1") == 0;
options->wrap_mode = intval ? GTK_WRAP_WORD : GTK_WRAP_NONE;
options->set |= MODELINE_SET_WRAP_MODE;
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}
else if (strcmp (key->str, "word-wrap-column") == 0)
{
intval = atoi (value->str);
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if (intval)
{
options->right_margin_position = intval;
options->display_right_margin = TRUE;
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options->set |= MODELINE_SET_RIGHT_MARGIN_POSITION |
MODELINE_SET_SHOW_RIGHT_MARGIN;
}
}
}
g_string_free (key, TRUE);
g_string_free (value, TRUE);
return s;
}
/* Scan a line for vi(m)/emacs/kate modelines.
* Line numbers are counted starting at one.
*/
static void
parse_modeline (gchar *s,
gint line_number,
gint line_count,
ModelineOptions *options)
{
gchar prev;
/* look for the beginning of a modeline */
for (prev = ' '; (s != NULL) && (*s != '\0'); prev = *(s++))
{
if (!g_ascii_isspace (prev))
continue;
if ((line_number <= 3 || line_number > line_count - 3) &&
(strncmp (s, "ex:", 3) == 0 ||
strncmp (s, "vi:", 3) == 0 ||
strncmp (s, "vim:", 4) == 0))
{
xed_debug_message (DEBUG_PLUGINS, "Vim modeline on line %d", line_number);
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while (*s != ':') s++;
s = parse_vim_modeline (s + 1, options);
}
else if (line_number <= 2 && strncmp (s, "-*-", 3) == 0)
{
xed_debug_message (DEBUG_PLUGINS, "Emacs modeline on line %d", line_number);
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s = parse_emacs_modeline (s + 3, options);
}
else if ((line_number <= 10 || line_number > line_count - 10) &&
strncmp (s, "kate:", 5) == 0)
{
xed_debug_message (DEBUG_PLUGINS, "Kate modeline on line %d", line_number);
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s = parse_kate_modeline (s + 5, options);
}
}
}
static gboolean
check_previous (GtkSourceView *view,
ModelineOptions *previous,
ModelineSet set)
{
GtkSourceBuffer *buffer = GTK_SOURCE_BUFFER (gtk_text_view_get_buffer (GTK_TEXT_VIEW (view)));
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/* Do not restore default when this is the first time */
if (!previous)
return FALSE;
/* Do not restore default when previous was not set */
if (!(previous->set & set))
return FALSE;
/* Only restore default when setting has not changed */
switch (set)
{
case MODELINE_SET_INSERT_SPACES:
return gtk_source_view_get_insert_spaces_instead_of_tabs (view) ==
previous->insert_spaces;
break;
case MODELINE_SET_TAB_WIDTH:
return gtk_source_view_get_tab_width (view) == previous->tab_width;
break;
case MODELINE_SET_INDENT_WIDTH:
return gtk_source_view_get_indent_width (view) == previous->indent_width;
break;
case MODELINE_SET_WRAP_MODE:
return gtk_text_view_get_wrap_mode (GTK_TEXT_VIEW (view)) ==
previous->wrap_mode;
break;
case MODELINE_SET_RIGHT_MARGIN_POSITION:
return gtk_source_view_get_right_margin_position (view) ==
previous->right_margin_position;
break;
case MODELINE_SET_SHOW_RIGHT_MARGIN:
return gtk_source_view_get_show_right_margin (view) ==
previous->display_right_margin;
break;
case MODELINE_SET_LANGUAGE:
{
GtkSourceLanguage *language = gtk_source_buffer_get_language (buffer);
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return (language == NULL && previous->language_id == NULL) ||
(language != NULL && g_strcmp0 (gtk_source_language_get_id (language),
previous->language_id) == 0);
}
break;
default:
return FALSE;
break;
}
}
static void
free_modeline_options (ModelineOptions *options)
{
g_free (options->language_id);
g_slice_free (ModelineOptions, options);
}
void
modeline_parser_apply_modeline (GtkSourceView *view)
{
ModelineOptions options;
GtkTextBuffer *buffer;
GtkTextIter iter, liter;
gint line_count;
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options.language_id = NULL;
options.set = MODELINE_SET_NONE;
buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
gtk_text_buffer_get_start_iter (buffer, &iter);
line_count = gtk_text_buffer_get_line_count (buffer);
/* Parse the modelines on the 10 first lines... */
while ((gtk_text_iter_get_line (&iter) < 10) &&
!gtk_text_iter_is_end (&iter))
{
gchar *line;
liter = iter;
gtk_text_iter_forward_to_line_end (&iter);
line = gtk_text_buffer_get_text (buffer, &liter, &iter, TRUE);
parse_modeline (line,
1 + gtk_text_iter_get_line (&iter),
line_count,
&options);
gtk_text_iter_forward_line (&iter);
g_free (line);
}
/* ...and on the 10 last ones (modelines are not allowed in between) */
if (!gtk_text_iter_is_end (&iter))
{
gint cur_line;
guint remaining_lines;
/* we are on the 11th line (count from 0) */
cur_line = gtk_text_iter_get_line (&iter);
/* g_assert (10 == cur_line); */
remaining_lines = line_count - cur_line - 1;
if (remaining_lines > 10)
{
gtk_text_buffer_get_end_iter (buffer, &iter);
gtk_text_iter_backward_lines (&iter, 9);
}
}
while (!gtk_text_iter_is_end (&iter))
{
gchar *line;
liter = iter;
gtk_text_iter_forward_to_line_end (&iter);
line = gtk_text_buffer_get_text (buffer, &liter, &iter, TRUE);
parse_modeline (line,
1 + gtk_text_iter_get_line (&iter),
line_count,
&options);
gtk_text_iter_forward_line (&iter);
g_free (line);
}
/* Try to set language */
if (has_option (&options, MODELINE_SET_LANGUAGE) && options.language_id)
{
GtkSourceLanguageManager *manager;
GtkSourceLanguage *language;
manager = xed_get_language_manager ();
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language = gtk_source_language_manager_get_language
(manager, options.language_id);
if (language != NULL)
{
gtk_source_buffer_set_language (GTK_SOURCE_BUFFER (buffer),
language);
}
}
ModelineOptions *previous = g_object_get_data (G_OBJECT (buffer),
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MODELINE_OPTIONS_DATA_KEY);
/* Apply the options we got from modelines and restore defaults if
we set them before */
if (has_option (&options, MODELINE_SET_INSERT_SPACES))
{
gtk_source_view_set_insert_spaces_instead_of_tabs
(view, options.insert_spaces);
}
else if (check_previous (view, previous, MODELINE_SET_INSERT_SPACES))
{
gtk_source_view_set_insert_spaces_instead_of_tabs
(view,
xed_prefs_manager_get_insert_spaces ());
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}
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if (has_option (&options, MODELINE_SET_TAB_WIDTH))
{
gtk_source_view_set_tab_width (view, options.tab_width);
}
else if (check_previous (view, previous, MODELINE_SET_TAB_WIDTH))
{
gtk_source_view_set_tab_width (view,
xed_prefs_manager_get_tabs_size ());
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}
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if (has_option (&options, MODELINE_SET_INDENT_WIDTH))
{
gtk_source_view_set_indent_width (view, options.indent_width);
}
else if (check_previous (view, previous, MODELINE_SET_INDENT_WIDTH))
{
gtk_source_view_set_indent_width (view, -1);
}
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if (has_option (&options, MODELINE_SET_WRAP_MODE))
{
gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view), options.wrap_mode);
}
else if (check_previous (view, previous, MODELINE_SET_WRAP_MODE))
{
gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view),
xed_prefs_manager_get_wrap_mode ());
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}
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if (has_option (&options, MODELINE_SET_RIGHT_MARGIN_POSITION))
{
gtk_source_view_set_right_margin_position (view, options.right_margin_position);
}
else if (check_previous (view, previous, MODELINE_SET_RIGHT_MARGIN_POSITION))
{
gtk_source_view_set_right_margin_position (view,
xed_prefs_manager_get_right_margin_position ());
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}
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if (has_option (&options, MODELINE_SET_SHOW_RIGHT_MARGIN))
{
gtk_source_view_set_show_right_margin (view, options.display_right_margin);
}
else if (check_previous (view, previous, MODELINE_SET_SHOW_RIGHT_MARGIN))
{
gtk_source_view_set_show_right_margin (view,
xed_prefs_manager_get_display_right_margin ());
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}
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if (previous)
{
g_free (previous->language_id);
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*previous = options;
previous->language_id = g_strdup (options.language_id);
}
else
{
previous = g_slice_new (ModelineOptions);
*previous = options;
previous->language_id = g_strdup (options.language_id);
g_object_set_data_full (G_OBJECT (buffer),
MODELINE_OPTIONS_DATA_KEY,
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previous,
(GDestroyNotify)free_modeline_options);
}
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g_free (options.language_id);
}
void
modeline_parser_deactivate (GtkSourceView *view)
{
g_object_set_data (G_OBJECT (gtk_text_view_get_buffer (GTK_TEXT_VIEW (view))),
MODELINE_OPTIONS_DATA_KEY,
NULL);
}
/* vi:ts=8 */