Function reformat_files

tests/test_incremental.c:80–104

Append "# reformatted" to up to max_files .py files in subdir (cross-platform). */

/* Append "# reformatted" to up to max_files .py files in subdir (cross-platform). */
static int reformat_files(const char *subdir, int max_files) {
    char dir[512];
    snprintf(dir, sizeof(dir), "%s/%s", g_repodir, subdir);
    cbm_dir_t *d = cbm_opendir(dir);
    if (!d) {
        return -1;
    }
    cbm_dirent_t *entry;
    int count = 0;
    while ((entry = cbm_readdir(d)) != NULL && count < max_files) {
        size_t nlen = strlen(entry->name);
        if (nlen < 4 || strcmp(entry->name + nlen - 3, ".py") != 0) {
            continue;
        }
        if (entry->is_dir) {
            continue;
        }
        char path[1024];
        snprintf(path, sizeof(path), "%s/%s", dir, entry->name);
        th_append_file(path, "# reformatted\n");
        count++;
    }
    cbm_closedir(d);
    return 0;
}

static char *index_repo(void) {
    char args[512];