add log file path to config, initialize default value

src/config.c

@@ -1,6 +1,6 @@
-#include "config.h"
-#include "wm.h"
 #include <assert.h>
+#include <fcntl.h>
+#include <limits.h>
 #include <stdint.h>
 #include <errno.h>
 #include <stdbool.h>
@@ -10,6 +10,10 @@
 #include <string.h>
 #include <ctype.h>
 #include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "config.h"
+#include "wm.h"
 
 void wm_cfg_init_def(Config *config)
 {
@@ -20,6 +24,20 @@ void wm_cfg_init_def(Config *config)
     config->focus_on_motion = true;
 
     wm_keybinds_init_def(config);
+
+    char log_file_dir[PATH_MAX] = {0};
+    const char* log_file_name = "wm.json";
+    char *xdg_data_home = getenv("XDG_DATA_HOME");
+
+    if (!xdg_data_home) {
+        char *home = getenv("HOME");
+        assert(home);
+        snprintf(log_file_dir, sizeof(log_file_dir), "%s/.local/share", home);
+    } else {
+        strncpy(log_file_dir, xdg_data_home, PATH_MAX);
+    }
+
+    snprintf(config->log_path, PATH_MAX, "%s/%s", log_file_dir, log_file_name);
 }
 
 void wm_keybinds_init_def(Config *config)

src/config.h

@@ -78,6 +78,7 @@ typedef struct {
     Keybind *keybinds;
     int kb_count;
     bool focus_on_motion;
+    char log_path[PATH_MAX];
 } Config;
 
 void wm_cfg_init_def(Config *config);