feat: modernize config

- config now is more toml like
- no need to declare all fields, it implements defaults
- no yanderedev code, introspection babbyyy 😎
- desktop and config files parser semi-unification
- misc tweaks all over (mainly allocation failures handling)

src/desktop.c

@@ -5,7 +5,20 @@
 #include <string.h>
 
 #include "desktop.h"
-#include "macros.h"
+
+char* trim_str(char* str) {
+  while (*str == ' ' || *str == '\t')
+    str++;
+
+  size_t i = strlen(str);
+  while (i > 0) {
+    if (str[i - 1] != ' ' && str[i - 1] != '\t' && str[i - 1] != '\n') break;
+    i--;
+  }
+  str[i] = '\0';
+
+  return str;
+}
 
 int read_desktop(FILE* fd, void* ctx,
                  struct status (*cb)(void* ctx, char* table, char* key,
@@ -19,34 +32,42 @@ int read_desktop(FILE* fd, void* ctx,
   while ((read_size = getline(&buf, &alloc_size, fd)) > 0) {
     ret = 0;
 
-    if (read_size <= 1) continue;
+    char* buf_start = trim_str(buf);
+    size_t indent_size = buf_start - buf;
 
-    if (buf[0] == '[' && buf[read_size - 2] == ']') {
+    if (read_size - indent_size < 1) continue;
+    if (*buf_start == '#') continue;
+
+    if (*buf_start == '[' && buf_start[strlen(buf_start) - 1] == ']') {
       if (table_name != NULL) free(table_name);
-      table_name = realloc(buf, read_size);
-      table_name[read_size - 1] = '\0'; // newline
-      buf = NULL;
-      alloc_size = 0;
+      buf_start[strlen(buf_start) - 1] = '\0';
+      table_name = strdup(buf_start + 1);
+      if (table_name == NULL) {
+        ret = -1;
+        break;
+      }
     } else {
       // Find '='
       size_t eq_idx = 0;
-      while (buf[eq_idx] != '\0') {
-        if (buf[eq_idx] == '=') break;
+      while (buf_start[eq_idx] != '\0') {
+        if (buf_start[eq_idx] == '=') break;
         eq_idx++;
       }
       // impossible with a min len of 1 (empty line)
       if (eq_idx == 0) continue;
       // Check its not end
-      if (buf[eq_idx] != '=') {
+      if (buf_start[eq_idx] != '=') {
         ret = -1;
         break;
       }
 
       // Key & Value
-      char* key = buf;
-      buf[eq_idx] = '\0'; // the equal
-      char* value = &buf[eq_idx + 1];
-      buf[read_size - 1] = '\0'; // the newline
+      char* key = buf_start;
+      buf_start[eq_idx] = '\0'; // the equal
+      key = trim_str(key);
+      char* value = &buf_start[eq_idx + 1];
+      buf_start[read_size - 1] = '\0'; // the newline
+      value = trim_str(value);
 
       // Callback
       struct status cb_ret = cb(ctx, table_name, key, value);