Function resolve_sibling_file

src/pipeline/pass_pkgmap.c:1700–1763

Resolve a sibling-file import: a bare path/name (no leading "./") that names * a file relative to the importer's directory. This covers build/markup * grammars whose import string is a sibling filename or directory rather than a * dotted module path: * - SCSS `@use 'vars'` → sibling `_vars.scss` (partial underscore) * - Just `import 'common.just'` → sibling `common.jus

 * File/Module-node QN (extension is stripped by fqn_module).  Returns a borrowed
 * node or NULL.  Several filename conventions are tried in turn. */
static const cbm_gbuf_node_t *resolve_sibling_file(const cbm_pipeline_ctx_t *ctx,
                                                   const char *source_rel,
                                                   const char *source_file_qn,
                                                   const char *module_path) {
    if (!module_path || !module_path[0]) {
        return NULL;
    }
    /* Directory of the importing file (empty for repo-root files). */
    char *dir = path_dirname(source_rel ? source_rel : "");
    if (!dir) {
        return NULL;
    }

    /* Candidate relative paths, in priority order. */
    char cands[5][PKGMAP_PATH_BUF];
    int ncand = 0;
    const char *base = module_path;
    /* Skip a leading "./". */
    if (base[0] == '.' && base[1] == '/') {
        base += 2;
    }
    /* 1. Direct sibling: dir/<module_path>. */
    snprintf(cands[ncand++], PKGMAP_PATH_BUF, "%s%s%s", dir, dir[0] ? "/" : "", base);
    /* 2. SCSS partial: dir/[subdir/]_<basename>.scss (underscore-prefixed). */
    {
        const char *slash = strrchr(base, '/');
        const char *bn = slash ? slash + 1 : base;
        char *dpart = slash ? cbm_strndup(base, (size_t)(slash - base)) : strdup("");
        if (dpart && bn[0] != '_') {
            snprintf(cands[ncand++], PKGMAP_PATH_BUF, "%s%s%s%s_%s.scss", dir, dir[0] ? "/" : "",
                     dpart[0] ? dpart : "", dpart[0] ? "/" : "", bn);
        }
        free(dpart);
    }
    /* 3. Meson subdir: dir/<module_path>/meson.build. */
    snprintf(cands[ncand++], PKGMAP_PATH_BUF, "%s%s%s/meson.build", dir, dir[0] ? "/" : "", base);
    /* 4. Basename sibling: dir/<basename(module_path)>.  Covers include paths
     *    that carry a non-relative prefix (Hyprlang `source = ~/.config/.../x.conf`,
     *    absolute include paths) but reference a file sitting beside the importer. */
    {
        const char *slash = strrchr(base, '/');
        if (slash && slash[1]) {
            snprintf(cands[ncand++], PKGMAP_PATH_BUF, "%s%s%s", dir, dir[0] ? "/" : "", slash + 1);
        }
    }

    const cbm_gbuf_node_t *found = NULL;
    for (int i = 0; i < ncand; i++) {
        char *qn = cbm_pipeline_fqn_module(ctx->project_name, cands[i]);
        if (!qn) {
            continue;
        }
        const cbm_gbuf_node_t *n = cbm_gbuf_find_by_qn(ctx->gbuf, qn);
        free(qn);
        if (n && import_targetable_label(n->label) &&
            (!source_file_qn || !n->qualified_name ||
             strcmp(n->qualified_name, source_file_qn) != 0)) {
            found = n;