Display window title and icon in swaybar

Signed-off-by: Felix Weilbach <felix.weilbach@t-online.de>

swaybar/desktop.c

@@ -0,0 +1,96 @@
+#define _POSIX_C_SOURCE 200809
+#include <assert.h>
+#include <string.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <limits.h>
+
+#include "swaybar/tray/icon.h"
+#include "desktop.h"
+#include "log.h"
+
+static list_t *get_desktop_files_basedirs() {
+	list_t *basedirs = create_list();
+	// TODO: Get correct list of directories
+	list_add(basedirs, "/usr/share/applications");
+	return basedirs;
+}
+
+static char *load_desktop_entry(const char *app_name, list_t *basedirs) {
+	assert(app_name);
+	assert(basedirs);
+
+	size_t desktop_filename_len = snprintf(NULL, 0, "%s.desktop", app_name) + 1;
+	char *desktop_filename = malloc(desktop_filename_len);
+	snprintf(desktop_filename, desktop_filename_len, "%s.desktop", app_name);
+
+	for (int i = 0; i < basedirs->length; ++i) {
+		const char *basedir = basedirs->items[i];
+
+		DIR *d;
+		struct dirent *dir;
+		d = opendir(basedir);
+		if (d) {
+			while ((dir = readdir(d)) != NULL) {
+				if (strcmp(desktop_filename, dir->d_name) == 0) {
+					char *buf = append_path_safe(basedir, desktop_filename);
+
+					FILE *f = fopen(buf, "rb");
+					assert(f);
+					fseek(f, 0, SEEK_END);
+					long fsize = ftell(f);
+					fseek(f, 0, SEEK_SET); /* same as rewind(f); */
+
+					char *string = malloc(fsize + 1);
+					fread(string, 1, fsize, f);
+					fclose(f);
+
+					string[fsize] = 0;
+					closedir(d);
+
+					return string;
+				}
+			}
+			closedir(d);
+		}
+	}
+
+	return NULL;
+}
+
+char *load_desktop_entry_from_xdgdirs(const char *app_name) {
+	list_t *basedirs = get_desktop_files_basedirs();
+	return load_desktop_entry(app_name, basedirs);
+}
+
+char *get_icon_name_from_desktop_entry(const char *desktop_entry) {
+	if (!desktop_entry) {
+		return NULL;
+	}
+
+	char *desktop_entry_start = strdup(desktop_entry);
+	char *cur_line = desktop_entry_start;
+	char *icon_name = NULL;
+	while (cur_line) {
+		char *next_line = strchr(cur_line, '\n');
+		if (next_line) {
+			*next_line = 0;
+		}
+
+		if (strncmp(cur_line, "Icon=", 5) == 0) {
+			const char *icon_name_start = strchr(cur_line, '=') + 1;
+			icon_name = strdup(icon_name_start);
+			break;
+		}
+
+		if (next_line) {
+			*next_line = '\n';
+		}
+		cur_line = next_line ? (next_line + 1) : NULL;
+	}
+	free(desktop_entry_start);
+
+	return icon_name;
+}