renderer: accept empty list of files with -l

3 files changed, 43 insertions, 6 deletions

diff --git a/src/main.c b/src/main.c
index 06b8714..616641f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -195,12 +195,9 @@ main(int argc, char **argv)
             sources = b_slist_append(sources, b_strdup(argv[i]));
     }
 
-    if (b_slist_length(sources) == 0) {
+    if (!listing && b_slist_length(sources) == 0) {
         blogc_print_usage();
-        if (listing)
-            fprintf(stderr, "blogc: error: at least one source file is required\n");
-        else
-            fprintf(stderr, "blogc: error: one source file is required\n");
+        fprintf(stderr, "blogc: error: one source file is required\n");
         rv = 2;
         goto cleanup;
     }
diff --git a/src/renderer.c b/src/renderer.c
index bf8b8cc..47a5f87 100644
--- a/src/renderer.c
+++ b/src/renderer.c
@@ -71,7 +71,7 @@ blogc_format_date(const char *date, b_trie_t *global, b_trie_t *local)
 char*
 blogc_render(b_slist_t *tmpl, b_slist_t *sources, b_trie_t *config, bool listing)
 {
-    if (tmpl == NULL || sources == NULL)
+    if (tmpl == NULL)
         return NULL;
 
     b_slist_t *current_source = NULL;
@@ -136,6 +136,16 @@ blogc_render(b_slist_t *tmpl, b_slist_t *sources, b_trie_t *config, bool listing
                     }
                 }
                 if (0 == strcmp("listing", stmt->value)) {
+                    if (sources == NULL) {
+
+                        // we can just skip anything and walk until the next
+                        // 'endblock'
+                        while (stmt->type != BLOGC_TEMPLATE_ENDBLOCK_STMT) {
+                            tmp = tmp->next;
+                            stmt = tmp->data;
+                        }
+                        break;
+                    }
                     if (current_source == NULL) {
                         listing_start = tmp;
                         current_source = sources;
diff --git a/tests/check_renderer.c b/tests/check_renderer.c
index 154a8f0..fbe38de 100644
--- a/tests/check_renderer.c
+++ b/tests/check_renderer.c
@@ -143,6 +143,35 @@ test_render_listing(void **state)
 
 
 static void
+test_render_listing_empty(void **state)
+{
+    const char *str =
+        "foo\n"
+        "{% block listing_once %}fuuu{% endblock %}\n"
+        "{% block entry %}\n"
+        "{% ifdef GUDA %}{{ GUDA }}{% endif %}\n"
+        "{% ifdef CHUNDA %}{{ CHUNDA }}{% endif %}\n"
+        "{% endblock %}\n"
+        "{% block listing %}\n"
+        "{% ifdef DATE_FORMATTED %}{{ DATE_FORMATTED }}{% endif %}\n"
+        "bola: {% ifdef BOLA %}{{ BOLA }}{% endif %}\n"
+        "{% endblock %}\n";
+    blogc_error_t *err = NULL;
+    b_slist_t *l = blogc_template_parse(str, strlen(str), &err);
+    assert_non_null(l);
+    assert_null(err);
+    char *out = blogc_render(l, NULL, NULL, true);
+    assert_string_equal(out,
+        "foo\n"
+        "fuuu\n"
+        "\n"
+        "\n");
+    blogc_template_free_stmts(l);
+    free(out);
+}
+
+
+static void
 test_render_ifdef(void **state)
 {
     const char *str =
@@ -685,6 +714,7 @@ main(void)
     const UnitTest tests[] = {
         unit_test(test_render_entry),
         unit_test(test_render_listing),
+        unit_test(test_render_listing_empty),
         unit_test(test_render_ifdef),
         unit_test(test_render_ifdef2),
         unit_test(test_render_ifdef3),