+/*
+ * vim:ts=4:sw=4:expandtab
+ *
+ * i3 - an improved dynamic tiling window manager
+ * © 2009-2015 Michael Stapelberg and contributors (see also: LICENSE)
+ *
+ */
+#include "libi3.h"
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+/*
+ * Checks if the given path exists by calling stat().
+ *
+ */
+static bool path_exists(const char *path) {
+ struct stat buf;
+ return (stat(path, &buf) == 0);
+}
+
+/*
+ * Get the path of the first configuration file found. If override_configpath
+ * is specified, that path is returned and saved for further calls. Otherwise,
+ * checks the home directory first, then the system directory first, always
+ * taking into account the XDG Base Directory Specification ($XDG_CONFIG_HOME,
+ * $XDG_CONFIG_DIRS)
+ *
+ */
+char *get_config_path(const char *override_configpath, bool use_system_paths) {
+ char *xdg_config_home, *xdg_config_dirs, *config_path;
+
+ static const char *saved_configpath = NULL;
+
+ if (override_configpath != NULL) {
+ saved_configpath = override_configpath;
+ return sstrdup(saved_configpath);
+ }
+
+ if (saved_configpath != NULL)
+ return sstrdup(saved_configpath);
+
+ /* 1: check the traditional path under the home directory */
+ config_path = resolve_tilde("~/.i3/config");
+ if (path_exists(config_path))
+ return config_path;
+ free(config_path);
+
+ /* 2: check for $XDG_CONFIG_HOME/i3/config */
+ if ((xdg_config_home = getenv("XDG_CONFIG_HOME")) == NULL)
+ xdg_config_home = "~/.config";
+
+ xdg_config_home = resolve_tilde(xdg_config_home);
+ sasprintf(&config_path, "%s/i3/config", xdg_config_home);
+ free(xdg_config_home);
+
+ if (path_exists(config_path))
+ return config_path;
+ free(config_path);
+
+ /* The below paths are considered system-level, and can be skipped if the
+ * caller only wants user-level configs. */
+ if (!use_system_paths)
+ return NULL;
+
+ /* 3: check the traditional path under /etc */
+ config_path = SYSCONFDIR "/i3/config";
+ if (path_exists(config_path))
+ return sstrdup(config_path);
+
+ /* 4: check for $XDG_CONFIG_DIRS/i3/config */
+ if ((xdg_config_dirs = getenv("XDG_CONFIG_DIRS")) == NULL)
+ xdg_config_dirs = "/etc/xdg";
+
+ char *buf = sstrdup(xdg_config_dirs);
+ char *tok = strtok(buf, ":");
+ while (tok != NULL) {
+ tok = resolve_tilde(tok);
+ sasprintf(&config_path, "%s/i3/config", tok);
+ free(tok);
+ if (path_exists(config_path)) {
+ free(buf);
+ return config_path;
+ }
+ free(config_path);
+ tok = strtok(NULL, ":");
+ }
+ free(buf);
+
+ return NULL;
+}