Fix lint issues in userconfig + add custom extensions docs to README

- clang-format: fix alignment in userconfig.c and userconfig.h
- Magic number 1280 → PATH_BUF_SZ named constant
- Remove dead g-- before break in dedup loop (cppcheck)
- Add "Custom File Extensions" section to README documenting
  .codebase-memory.json and global config

Author: DeusData

README.md

@@ -306,6 +306,24 @@ codebase-memory-mcp config set auto_index_limit 50000    # max files for auto-in
 codebase-memory-mcp config reset auto_index              # reset to default
 ```
 
+## Custom File Extensions
+
+Map additional file extensions to supported languages via JSON config files. Useful for framework-specific extensions like `.blade.php` (Laravel) or `.mjs` (ES modules).
+
+**Per-project** (in your repo root):
+```json
+// .codebase-memory.json
+{"extra_extensions": {".blade.php": "php", ".mjs": "javascript"}}
+```
+
+**Global** (applies to all projects):
+```json
+// ~/.config/codebase-memory-mcp/config.json  (or $XDG_CONFIG_HOME/...)
+{"extra_extensions": {".twig": "html", ".phtml": "php"}}
+```
+
+Project config overrides global for conflicting extensions. Unknown language values are silently skipped. Missing config files are ignored.
+
 ## Persistence
 
 SQLite databases stored at `~/.cache/codebase-memory-mcp/`. Persists across restarts (WAL mode, ACID-safe). To reset: `rm -rf ~/.cache/codebase-memory-mcp/`.

src/discover/userconfig.c

@@ -219,8 +219,7 @@ static int parse_extra_extensions(yyjson_val *root, cbm_userext_t **entries, int
         }
 
         /* Grow the array */
-        cbm_userext_t *tmp =
-            realloc(*entries, (size_t)(*count + 1) * sizeof(cbm_userext_t));
+        cbm_userext_t *tmp = realloc(*entries, (size_t)(*count + 1) * sizeof(cbm_userext_t));
         if (!tmp) {
             return -1;
         }
@@ -297,10 +296,11 @@ cbm_userconfig_t *cbm_userconfig_load(const char *repo_path) {
     int count = 0;
 
     /* ── Step 1: Load global config ── */
+    enum { PATH_BUF_SZ = 1280 };
     char global_dir[1024];
     cbm_app_config_dir(global_dir, sizeof(global_dir));
 
-    char global_path[1280];
+    char global_path[PATH_BUF_SZ];
     snprintf(global_path, sizeof(global_path), "%s/config.json", global_dir);
 
     if (load_config_file(global_path, &entries, &count) != 0) {
@@ -316,7 +316,7 @@ cbm_userconfig_t *cbm_userconfig_load(const char *repo_path) {
 
     /* ── Step 2: Load project config ── */
     if (repo_path && repo_path[0]) {
-        char project_path[1280];
+        char project_path[PATH_BUF_SZ];
         snprintf(project_path, sizeof(project_path), "%s/.codebase-memory.json", repo_path);
 
         if (load_config_file(project_path, &entries, &count) != 0) {
@@ -345,7 +345,6 @@ cbm_userconfig_t *cbm_userconfig_load(const char *repo_path) {
                 entries[g] = entries[global_count - 1];
                 entries[global_count - 1].ext = NULL; /* mark as consumed */
                 global_count--;
-                g--; /* re-check this index */
                 break;
             }
         }

src/discover/userconfig.h

@@ -22,8 +22,8 @@
 /* ── Types ──────────────────────────────────────────────────────── */
 
 typedef struct {
-    char *ext;         /* file extension including dot, e.g. ".blade.php" */
-    CBMLanguage lang;  /* resolved language enum */
+    char *ext;        /* file extension including dot, e.g. ".blade.php" */
+    CBMLanguage lang; /* resolved language enum */
 } cbm_userext_t;
 
 typedef struct {