content-parser: source-parser: extract TITLE from content header

this patch implements support to using the first header found in source
file as the TITLE variable. please note that if the TITLE variable is
defined on the source file's variable section it takes precedence.

this patch changes the old behaviour and can break some users' websites.
if you have some '{% ifdef TITLE %}' blocks in your template, they will
evaluate to true if you don't defined TITLE manually, but have a header
in your content.

3 files changed, 21 insertions, 5 deletions

diff --git a/src/blogc/content-parser.c b/src/blogc/content-parser.c
index 23586bb..415e5ee 100644
--- a/src/blogc/content-parser.c
+++ b/src/blogc/content-parser.c
@@ -674,7 +674,8 @@ blogc_is_ordered_list_item(const char *str, size_t prefix_len)
 
 
 char*
-blogc_content_parse(const char *src, size_t *end_excerpt, char **description)
+blogc_content_parse(const char *src, size_t *end_excerpt, char **title,
+    char **description)
 {
     // src is always nul-terminated.
     size_t src_len = strlen(src);
@@ -834,6 +835,8 @@ blogc_content_parse(const char *src, size_t *end_excerpt, char **description)
                     end = is_last && c != '\n' && c != '\r' ? src_len :
                         (real_end != 0 ? real_end : current);
                     tmp = bc_strndup(src + start, end - start);
+                    if (title != NULL && *title == NULL)
+                        *title = bc_strdup(tmp);
                     parsed = blogc_content_parse_inline(tmp);
                     slug = blogc_slugify(tmp);
                     if (slug == NULL)
@@ -915,10 +918,10 @@ blogc_content_parse(const char *src, size_t *end_excerpt, char **description)
                     for (bc_slist_t *l = lines; l != NULL; l = l->next)
                         bc_string_append_printf(tmp_str, "%s%s", l->data,
                             line_ending);
-                    // do not propagate description to blockquote parsing,
+                    // do not propagate title and description to blockquote parsing,
                     // because we just want paragraphs from first level of
                     // content.
-                    tmp = blogc_content_parse(tmp_str->str, NULL, NULL);
+                    tmp = blogc_content_parse(tmp_str->str, NULL, NULL, NULL);
                     bc_string_append_printf(rv, "<blockquote>%s</blockquote>%s",
                         tmp, line_ending);
                     free(tmp);
diff --git a/src/blogc/content-parser.h b/src/blogc/content-parser.h
index 37e38d7..39230c6 100644
--- a/src/blogc/content-parser.h
+++ b/src/blogc/content-parser.h
@@ -17,7 +17,7 @@ char* blogc_htmlentities(const char *str);
 char* blogc_fix_description(const char *paragraph);
 char* blogc_content_parse_inline(const char *src);
 bool blogc_is_ordered_list_item(const char *str, size_t prefix_len);
-char* blogc_content_parse(const char *src, size_t *end_excerpt,
+char* blogc_content_parse(const char *src, size_t *end_excerpt, char **title,
     char **description);
 
 #endif /* _CONTENT_PARSER_H */
diff --git a/src/blogc/source-parser.c b/src/blogc/source-parser.c
index a3d1e09..f6f3471 100644
--- a/src/blogc/source-parser.c
+++ b/src/blogc/source-parser.c
@@ -150,8 +150,21 @@ blogc_source_parse(const char *src, size_t src_len, bc_error_t **err)
                 if (current == (src_len - 1)) {
                     tmp = bc_strndup(src + start, src_len - start);
                     bc_trie_insert(rv, "RAW_CONTENT", tmp);
+                    char *title = NULL;
                     char *description = NULL;
-                    content = blogc_content_parse(tmp, &end_excerpt, &description);
+                    content = blogc_content_parse(tmp, &end_excerpt, &title,
+                        &description);
+                    if (title != NULL) {
+                        // do not override source-provided title.
+                        if (NULL == bc_trie_lookup(rv, "TITLE")) {
+                            // no need to free, because we are transfering memory
+                            // ownership to the trie.
+                            bc_trie_insert(rv, "TITLE", title);
+                        }
+                        else {
+                            free(title);
+                        }
+                    }
                     if (description != NULL) {
                         // do not override source-provided description.
                         if (NULL == bc_trie_lookup(rv, "DESCRIPTION")) {