Fastfetch: enhances config file loading with support for config directory

Fixes #2080

Author: CarterLi

CHANGELOG.md

@@ -1,6 +1,8 @@
 # 2.56.0
 
 Features:
+* Enhances config file loading. `--config` and `-c` with relative path now also searches paths defined in `fastfetch --list-config-paths` (typically `~/.config/fastfetch/`)
+    * This allows users to use `fastfetch -c my-config` without needing to specify the full path.
 * Adds NUMA node count detection (CPU)
     * Exposed via `{numa-nodes}` in custom format
     * Supported on Linux, FreeBSD and Windows

src/fastfetch.c

@@ -502,7 +502,20 @@ static void optionParseConfigFile(FFdata* data, const char* key, const char* val
 
     if (parseJsoncFile(absolutePath.chars, flag)) return;
 
-    //Try to load as a relative path
+    //Try to load as a relative path with the config directory
+
+    FF_LIST_FOR_EACH(FFstrbuf, path, instance.state.platform.configDirs)
+    {
+        ffStrbufSet(&absolutePath, path);
+        ffStrbufAppendS(&absolutePath, "fastfetch/");
+        ffStrbufAppendS(&absolutePath, value);
+        if (needExtension)
+            ffStrbufAppendS(&absolutePath, ".jsonc");
+
+        if (parseJsoncFile(absolutePath.chars, flag)) return;
+    }
+
+    //Try to load as a preset
 
     FF_LIST_FOR_EACH(FFstrbuf, path, instance.state.platform.dataDirs)
     {
@@ -515,7 +528,7 @@ static void optionParseConfigFile(FFdata* data, const char* key, const char* val
         if (parseJsoncFile(absolutePath.chars, flag)) return;
     }
 
-    //Try to load as a relative path with the directory of fastfetch binary
+    //Try to load as a relative path with the directory of fastfetch binary, for Windows support
 
     if (instance.state.platform.exePath.length)
     {