Function gi_add_pattern

src/discover/gitignore.c:203–279

/* ── Pattern parsing ─────────────────────────────────────────────── */

static void gi_add_pattern(cbm_gitignore_t *gi, const char *line, int len) {
    /* Trim trailing whitespace */
    while (len > 0 && (line[len - SKIP_ONE] == ' ' || line[len - SKIP_ONE] == '\t' ||
                       line[len - SKIP_ONE] == '\r')) {
        len--;
    }
    if (len == 0) {
        return;
    }

    gi_pattern_t p = {0};

    /* Check for negation */
    const char *start = line;
    if (*start == '!') {
        p.negated = true;
        start++;
        len--;
    }

    if (len == 0) {
        return;
    }

    /* Check for trailing / (directory-only) */
    if (start[len - SKIP_ONE] == '/') {
        p.dir_only = true;
        len--;
    }

    if (len == 0) {
        return;
    }

    /* Check for leading / (rooted) */
    if (*start == '/') {
        p.rooted = true;
        start++;
        len--;
    }

    if (len == 0) {
        return;
    }

    /* Check if pattern contains / anywhere (makes it rooted) */
    if (!p.rooted) {
        for (int i = 0; i < len; i++) {
            if (start[i] == '/') {
                p.rooted = true;
                break;
            }
        }
    }

    /* Copy pattern */
    p.pattern = malloc(len + SKIP_ONE);
    if (!p.pattern) {