Move entire git-prompt to C

git-prompt.c

@@ -8,11 +8,18 @@
 #include <sys/wait.h>
 #endif
 
+#ifdef DEBUG
 #define check(CONDITION)                                                    \
   if (CONDITION) {                                                          \
     fprintf(stderr, "error: %s: %d: %s\n", __FILE__, __LINE__, #CONDITION); \
     exit(0);                                                                \
   }
+#else
+#define check(CONDITION) \
+  if (CONDITION) {       \
+    exit(0);             \
+  }
+#endif
 
 typedef struct process {
   pid_t pid;
@@ -78,13 +85,8 @@ char* inttostr(char* buffer, int value) {
 }
 
 int main() {
-  process_t process;
-  // check we are in a git repo
-  process = process_open("git rev-parse --git-dir");
-  check(process_close(process));
-
   // get the current branch name
-  process = process_open("git symbolic-ref --short HEAD");
+  process_t process = process_open("git symbolic-ref --short HEAD");
   char branch_buf[256] = {};
   fread(branch_buf, 1, sizeof(branch_buf), process.out);
   if (process_close(process)) {