Add python detection and some utility macros to avoid repetition.

lang.c

@@ -8,21 +8,30 @@
 enum lang_index {
 	c_lang,
 	//cpp_lang,
-	//python_lang,
+	python_lang,
 	//go_lang,
 	lang_index_n
 };
-static int c_lang_check(const char *, unsigned char);
 
 struct lang_check {
 	int (*check)(const char *, unsigned char);
 	char display[8];
 };
 
+#define check_function(lang) lang##_lang_check
+#define check_function_decl(lang) static int check_function(lang) (const char *s, unsigned char t)
+#define struct_item(lang, d) [lang##_lang] = { .check = check_function(lang), .display = d }
+
+check_function_decl(c);
+check_function_decl(python);
+
 const struct lang_check l[] = {
-	[c_lang] = { .check = c_lang_check, .display = " C" },
+	struct_item(c, " C"),
+	struct_item(python, " 🐍"),
 };
 
+#undef struct_item
+
 /* bitmap of 1<<lang_index */
 void print_lang(uint64_t mask) {
 	for (int i = 0; i < lang_index_n; i++) {
@@ -60,7 +69,15 @@ void *lang_thread(void *arg)
 
 static inline int isfile(unsigned char t) { return t & (DT_REG | DT_LNK); }
 
-static int c_lang_check(const char *s, unsigned char t)
+check_function_decl(c)
 {
 	return isfile(t) && !fnmatch("*.c", s, 0);
 }
+
+check_function_decl(python)
+{
+	return isfile(t) && !fnmatch("*.py", s, 0);
+}
+
+#undef check_function
+#undef check_function_decl