Launcher: SVG icon support and icon loading improvements

git-svn-id: http://tint2.googlecode.com/svn/trunk@670 121b4492-b84c-0410-8b4c-0d4edfb3f3cc

src/launcher/apps-common.c

@@ -0,0 +1,187 @@
+/**************************************************************************
+* Tint2 : .desktop file handling
+*
+* Copyright (C) 2015       (mrovi9000@gmail.com)
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License version 2
+* as published by the Free Software Foundation.
+*
+* 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+**************************************************************************/
+
+/* http://standards.freedesktop.org/desktop-entry-spec/ */
+
+#include "apps-common.h"
+
+#include <glib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int parse_dektop_line(char *line, char **key, char **value)
+{
+	char *p;
+	int found = 0;
+	*key = line;
+	for (p = line; *p; p++) {
+		if (*p == '=') {
+			*value = p + 1;
+			*p = 0;
+			found = 1;
+			break;
+		}
+	}
+	if (!found)
+		return 0;
+	if (found && (strlen(*key) == 0 || strlen(*value) == 0))
+		return 0;
+	return 1;
+}
+
+void expand_exec(DesktopEntry *entry, const char *path)
+{
+	// Expand % in exec
+	// %i -> --icon Icon
+	// %c -> Name
+	// %k -> path
+	if (entry->exec) {
+		char *exec2 = malloc(strlen(entry->exec) + (entry->name ? strlen(entry->name) : 1) + (entry->icon ? strlen(entry->icon) : 1) + 100);
+		char *p, *q;
+		// p will never point to an escaped char
+		for (p = entry->exec, q = exec2; *p; p++, q++) {
+			*q = *p; // Copy
+			if (*p == '\\') {
+				p++, q++;
+				// Copy the escaped char
+				if (*p == '%') // For % we delete the backslash, i.e. write % over it
+					q--;
+				*q = *p;
+				if (!*p) break;
+				continue;
+			}
+			if (*p == '%') {
+				p++;
+				if (!*p) break;
+				if (*p == 'i' && entry->icon != NULL) {
+					sprintf(q, "--icon '%s'", entry->icon);
+					q += strlen("--icon ''");
+					q += strlen(entry->icon);
+					q--; // To balance the q++ in the for
+				} else if (*p == 'c' && entry->name != NULL) {
+					sprintf(q, "'%s'", entry->name);
+					q += strlen("''");
+					q += strlen(entry->name);
+					q--; // To balance the q++ in the for
+				} else if (*p == 'c') {
+					sprintf(q, "'%s'", path);
+					q += strlen("''");
+					q += strlen(path);
+					q--; // To balance the q++ in the for
+				} else {
+					// We don't care about other expansions
+					q--; // Delete the last % from q
+				}
+				continue;
+			}
+		}
+		*q = '\0';
+		free(entry->exec);
+		entry->exec = exec2;
+	}
+}
+
+int read_desktop_file(const char *path, DesktopEntry *entry)
+{
+	FILE *fp;
+	char *line = NULL;
+	size_t line_size;
+	char *key, *value;
+	int i;
+
+	entry->name = entry->icon = entry->exec = NULL;
+
+	if ((fp = fopen(path, "rt")) == NULL) {
+		fprintf(stderr, "Could not open file %s\n", path);
+		return 0;
+	}
+
+	gchar **languages = (gchar **)g_get_language_names();
+	// lang_index is the index of the language for the best Name key in the language vector
+	// lang_index_default is a constant that encodes the Name key without a language
+	int lang_index, lang_index_default;
+#define LANG_DBG 0
+	if (LANG_DBG) printf("Languages:");
+	for (i = 0; languages[i]; i++) {
+		if (LANG_DBG) printf(" %s", languages[i]);
+	}
+	if (LANG_DBG) printf("\n");
+	lang_index_default = i;
+	// we currently do not know about any Name key at all, so use an invalid index
+	lang_index = lang_index_default + 1;
+
+	int inside_desktop_entry = 0;
+	while (getline(&line, &line_size, fp) >= 0) {
+		int len = strlen(line);
+		if (len == 0)
+			continue;
+		line[len - 1] = '\0';
+		if (line[0] == '[') {
+			inside_desktop_entry = (strcmp(line, "[Desktop Entry]") == 0);
+		}
+		if (inside_desktop_entry && parse_dektop_line(line, &key, &value)) {
+			if (strstr(key, "Name") == key) {
+				if (strcmp(key, "Name") == 0 && lang_index > lang_index_default) {
+					entry->name = strdup(value);
+					lang_index = lang_index_default;
+				} else {
+					for (i = 0; languages[i] && i < lang_index; i++) {
+						gchar *localized_key = g_strdup_printf("Name[%s]", languages[i]);
+						if (strcmp(key, localized_key) == 0) {
+							if (entry->name)
+								free(entry->name);
+							entry->name = strdup(value);
+							lang_index = i;
+						}
+						g_free(localized_key);
+					}
+				}
+			} else if (!entry->exec && strcmp(key, "Exec") == 0) {
+				entry->exec = strdup(value);
+			} else if (!entry->icon && strcmp(key, "Icon") == 0) {
+				entry->icon = strdup(value);
+			}
+		}
+	}
+	fclose (fp);
+	// From this point:
+	// entry->name, entry->icon, entry->exec will never be empty strings (can be NULL though)
+
+	expand_exec(entry, path);
+
+	free(line);
+	return 1;
+}
+
+void free_desktop_entry(DesktopEntry *entry)
+{
+	free(entry->name);
+	free(entry->icon);
+	free(entry->exec);
+	entry->name = entry->icon = entry->exec = NULL;
+}
+
+void test_read_desktop_file()
+{
+	fprintf(stdout, "\033[1;33m");
+	DesktopEntry entry;
+	read_desktop_file("/usr/share/applications/firefox.desktop", &entry);
+	printf("Name:%s Icon:%s Exec:%s\n", entry.name, entry.icon, entry.exec);
+	fprintf(stdout, "\033[0m");
+}