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/* modeline.c
*
* Copyright 2025 Christian Hergert <chergert@redhat.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This library 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
* Lesser 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/>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include "modeline.h"
static Modeline *
modeline_new (const char *editor)
{
Modeline *self = g_new0 (Modeline, 1);
self->editor = g_strdup (editor);
return self;
}
void
modeline_free (Modeline *self)
{
g_clear_pointer (&self->editor, g_free);
g_clear_pointer (&self->settings, g_strfreev);
g_free (self);
}
static void
modeline_add_setting (Modeline *self,
const char *key,
const char *value)
{
self->settings = g_environ_setenv (self->settings, key, value, TRUE);
}
static void
parse_key_value_list (Modeline *self,
const char *text,
const char *sep,
gboolean has_eq)
{
g_auto(GStrv) tokens = g_strsplit (text, sep, 0);
for (char **t = tokens; *t; t++)
{
g_autofree char *key = NULL;
char *val = NULL;
if (has_eq)
{
key = g_strstrip (g_strdup (*t));
val = strchr (key, '=');
if (*key && val == NULL)
{
modeline_add_setting (self, key, "");
continue;
}
}
else
{
key = g_strstrip (g_strdup (*t));
val = strchr (key, ':');
if (!val)
val = strchr (key, ' ');
}
if (val)
{
*(val++) = '\0';
val = g_strstrip (val);
key = g_strstrip (key);
if (*key != 0)
modeline_add_setting (self, key, val);
}
}
}
Modeline *
modeline_parse (const char *line)
{
const char *vim_match;
const char *emacs_start;
const char *kate_match;
if (line == NULL || line[0] == 0)
return NULL;
/* Vim: vim: set ts=4 sw=4 et: */
if ((vim_match = strstr (line, "vim:")) || (vim_match = strstr (line, "vi:")))
{
const char *start = strstr (vim_match, "set");
const char *end = strrchr (line, ':');
if (start)
start += strlen ("set");
if (start && end > start)
{
g_autofree char *sub = g_strndup (start, end - start);
Modeline *m = modeline_new ("vim");
parse_key_value_list (m, sub, " ", TRUE);
return m;
}
}
/* Emacs and JOE: -*- mode: python; tab-width: 4 -*- */
if ((emacs_start = strstr (line, "-*-")))
{
const char *end = strstr (emacs_start + 3, "-*-");
if (end)
{
g_autofree char *sub = g_strndup (emacs_start + 3, end - (emacs_start + 3));
Modeline *m = modeline_new (strstr (sub, "nano-") ? "nano" : "emacs");
parse_key_value_list (m, sub, ";", FALSE);
return m;
}
}
/* Kate: kate: indent-mode normal; tab-width 4; */
if ((kate_match = strstr (line, "kate:")))
{
Modeline *m = modeline_new ("kate");
kate_match += 5;
parse_key_value_list (m, kate_match, ";", FALSE);
return m;
}
/* Geany: geany_encoding=UTF-8 */
if (strstr (line, "geany_"))
{
Modeline *m = modeline_new ("geany");
parse_key_value_list (m, line, " ", TRUE);
return m;
}
return NULL;
}
static Modeline *
modeline_copy (Modeline *modeline)
{
if (modeline != NULL)
{
Modeline *copy = g_new0 (Modeline, 1);
copy->editor = g_strdup (modeline->editor);
copy->settings = g_strdupv (modeline->settings);
return copy;
}
return NULL;
}
G_DEFINE_BOXED_TYPE (Modeline, modeline, modeline_copy, modeline_free)
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