From 8ba264584bafaf1ee3592c338d4db91e591bdfb0 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sun, 27 Dec 2015 23:17:46 -0800
Subject: latex renderer - better handling of internal links.

Now we render `[foo](#bar)` as `\protect\hyperlink{bar}{foo}`.
---
 src/latex.c | 59 ++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 36 insertions(+), 23 deletions(-)

(limited to 'src/latex.c')

diff --git a/src/latex.c b/src/latex.c
index 0ae13cd..4ad8b89 100644
--- a/src/latex.c
+++ b/src/latex.c
@@ -142,7 +142,12 @@ static inline void outc(cmark_renderer *renderer, cmark_escaping escape,
   }
 }
 
-typedef enum { NO_LINK, URL_AUTOLINK, EMAIL_AUTOLINK, NORMAL_LINK } link_type;
+typedef enum { NO_LINK,
+	       URL_AUTOLINK,
+	       EMAIL_AUTOLINK,
+	       NORMAL_LINK,
+               INTERNAL_LINK
+             } link_type;
 
 static link_type get_link_type(cmark_node *node) {
   size_t title_len, url_len;
@@ -158,6 +163,10 @@ static link_type get_link_type(cmark_node *node) {
   const char *url = cmark_node_get_url(node);
   cmark_chunk url_chunk = cmark_chunk_literal(url);
 
+  if (url && *url == '#') {
+    return INTERNAL_LINK;
+  }
+
   url_len = safe_strlen(url);
   if (url_len == 0 || scan_scheme(&url_chunk, 0) == 0) {
     return NO_LINK;
@@ -166,30 +175,29 @@ static link_type get_link_type(cmark_node *node) {
   const char *title = cmark_node_get_title(node);
   title_len = safe_strlen(title);
   // if it has a title, we can't treat it as an autolink:
-  if (title_len > 0) {
-    return NORMAL_LINK;
-  }
-
-  link_text = node->first_child;
-  cmark_consolidate_text_nodes(link_text);
-  realurl = (char *)url;
-  realurllen = url_len;
-  if (strncmp(realurl, "mailto:", 7) == 0) {
-    realurl += 7;
-    realurllen -= 7;
-    isemail = true;
-  }
-  if (realurllen == link_text->as.literal.len &&
-      strncmp(realurl, (char *)link_text->as.literal.data,
-              link_text->as.literal.len) == 0) {
-    if (isemail) {
-      return EMAIL_AUTOLINK;
-    } else {
-      return URL_AUTOLINK;
+  if (title_len == 0) {
+
+    link_text = node->first_child;
+    cmark_consolidate_text_nodes(link_text);
+    realurl = (char *)url;
+    realurllen = url_len;
+    if (strncmp(realurl, "mailto:", 7) == 0) {
+      realurl += 7;
+      realurllen -= 7;
+      isemail = true;
+    }
+    if (realurllen == link_text->as.literal.len &&
+        strncmp(realurl, (char *)link_text->as.literal.data,
+                link_text->as.literal.len) == 0) {
+      if (isemail) {
+        return EMAIL_AUTOLINK;
+      } else {
+        return URL_AUTOLINK;
+      }
     }
-  } else {
-    return NORMAL_LINK;
   }
+
+  return NORMAL_LINK;
 }
 
 static int S_get_enumlevel(cmark_node *node) {
@@ -388,6 +396,11 @@ static int S_render_node(cmark_renderer *renderer, cmark_node *node,
         OUT(url, false, URL);
         LIT("}{");
         break;
+      case INTERNAL_LINK:
+        LIT("\\protect\\hyperlink{");
+        OUT(url + 1, false, URL);
+        LIT("}{");
+        break;
       case NO_LINK:
         LIT("{"); // error?
       }
-- 
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