[gnome-builder] markdown: bring back markdown live preview

[Christian Hergert <chergert src gnome org>]

commit 649cae7e95307f5c5d77be6cbaae6953bcd9fcc0
Author: Christian Hergert <christian hergert me>
Date:   Wed Dec 10 16:02:45 2014 -0800

    markdown: bring back markdown live preview

 src/editor/gb-editor-view.c        |   22 +++-
 src/gnome-builder.mk               |    2 -
 src/html/gb-html-document.c        |   85 +++++++++++-
 src/html/gb-html-document.h        |   12 ++-
 src/html/gb-html-view.c            |    8 +-
 src/markdown/gb-markdown-preview.c |  263 ------------------------------------
 src/markdown/gb-markdown-preview.h |   60 --------
 7 files changed, 116 insertions(+), 336 deletions(-)
---
diff --git a/src/editor/gb-editor-view.c b/src/editor/gb-editor-view.c
index 5d99031..9173596 100644
--- a/src/editor/gb-editor-view.c
+++ b/src/editor/gb-editor-view.c
@@ -151,13 +151,33 @@ gb_editor_view_create_preview (GbDocumentView *view)
 {
   GbEditorView *self = (GbEditorView *)view;
   GbDocument *document;
+  GbHtmlDocumentTransform transform = NULL;
+  GtkSourceBuffer *buffer;
+  GtkSourceLanguage *language;
 
   g_return_val_if_fail (GB_IS_EDITOR_VIEW (self), NULL);
 
+  buffer = GTK_SOURCE_BUFFER (self->priv->document);
+  language = gtk_source_buffer_get_language (buffer);
+
+  if (language)
+    {
+      const gchar *lang_id;
+
+      lang_id = gtk_source_language_get_id (language);
+
+      if (g_strcmp0 (lang_id, "markdown") == 0)
+        transform = gb_html_markdown_transform;
+    }
+
   document = g_object_new (GB_TYPE_HTML_DOCUMENT,
-                           "buffer", self->priv->document,
+                           "buffer", buffer,
                            NULL);
 
+  if (transform)
+    gb_html_document_set_transform_func (GB_HTML_DOCUMENT (document),
+                                         transform);
+
   return document;
 }
 
diff --git a/src/gnome-builder.mk b/src/gnome-builder.mk
index ab9ae15..41b0552 100644
--- a/src/gnome-builder.mk
+++ b/src/gnome-builder.mk
@@ -105,8 +105,6 @@ libgnome_builder_la_SOURCES = \
        src/html/gb-html-view.h \
        src/markdown/gs-markdown.c \
        src/markdown/gs-markdown.h \
-       src/markdown/gb-markdown-preview.c \
-       src/markdown/gb-markdown-preview.h \
        src/navigation/gb-navigation-list.h \
        src/navigation/gb-navigation-list.c \
        src/navigation/gb-navigation-item.h \
diff --git a/src/html/gb-html-document.c b/src/html/gb-html-document.c
index c823c59..9a560af 100644
--- a/src/html/gb-html-document.c
+++ b/src/html/gb-html-document.c
@@ -24,11 +24,13 @@
 #include "gb-editor-document.h"
 #include "gb-html-document.h"
 #include "gb-html-view.h"
+#include "gs-markdown.h"
 
 struct _GbHtmlDocumentPrivate
 {
-  GtkTextBuffer *buffer;
-  gchar         *title;
+  GtkTextBuffer           *buffer;
+  gchar                   *title;
+  GbHtmlDocumentTransform  transform;
 };
 
 static void gb_html_document_init_document (GbDocumentInterface *iface);
@@ -54,6 +56,41 @@ gb_html_document_new (void)
   return g_object_new (GB_TYPE_HTML_DOCUMENT, NULL);
 }
 
+void
+gb_html_document_set_transform_func (GbHtmlDocument          *document,
+                                     GbHtmlDocumentTransform  transform)
+{
+  g_return_if_fail (GB_IS_HTML_DOCUMENT (document));
+
+  document->priv->transform = transform;
+}
+
+gchar *
+gb_html_document_get_content (GbHtmlDocument *document)
+{
+  GtkTextIter begin;
+  GtkTextIter end;
+  gchar *tmp;
+  gchar *str;
+
+  g_return_val_if_fail (GB_IS_HTML_DOCUMENT (document), NULL);
+
+  if (!document->priv->buffer)
+    return NULL;
+
+  gtk_text_buffer_get_bounds (document->priv->buffer, &begin, &end);
+  str = gtk_text_iter_get_slice (&begin, &end);
+
+  if (document->priv->transform)
+    {
+      tmp = document->priv->transform (document, str);
+      g_free (str);
+      str = tmp;
+    }
+
+  return str;
+}
+
 static const gchar *
 gb_html_document_get_title (GbDocument *document)
 {
@@ -281,3 +318,47 @@ gb_html_document_init_document (GbDocumentInterface *iface)
   iface->get_modified = gb_html_document_get_modified;
   iface->create_view = gb_html_document_create_view;
 }
+
+gchar *
+gb_html_markdown_transform (GbHtmlDocument *document,
+                            const gchar    *content)
+{
+  GsMarkdown *md;
+  gchar *str;
+
+  g_return_if_fail (GB_IS_HTML_DOCUMENT (document));
+  g_return_if_fail (content);
+
+  md = gs_markdown_new (GS_MARKDOWN_OUTPUT_HTML);
+  gs_markdown_set_autolinkify (md, TRUE);
+  gs_markdown_set_escape (md, TRUE);
+
+  str = gs_markdown_parse (md, content);
+
+  if (str)
+    {
+      GBytes *css;
+      const guint8 *css_data;
+      gchar *tmp;
+
+      css = g_resources_lookup_data ("/org/gnome/builder/css/markdown.css",
+                                     0, NULL);
+      css_data = g_bytes_get_data (css, NULL);
+      tmp = g_strdup_printf ("<html>\n"
+                             " <style>%s</style>\n"
+                             " <body>\n"
+                             "  <div class=\"markdown-body\">\n"
+                             "   %s\n"
+                             "  </div>\n"
+                             " </body>\n"
+                             "</html>",
+                             (gchar *)css_data, str);
+      g_free (str);
+
+      str = tmp;
+    }
+
+  g_clear_object (&md);
+
+  return str;
+}
diff --git a/src/html/gb-html-document.h b/src/html/gb-html-document.h
index 17fe731..a3fd37f 100644
--- a/src/html/gb-html-document.h
+++ b/src/html/gb-html-document.h
@@ -48,8 +48,16 @@ struct _GbHtmlDocumentClass
   GObjectClass parent;
 };
 
-GType          gb_html_document_get_type   (void);
-GtkTextBuffer *gb_html_document_get_buffer (GbHtmlDocument *document);
+typedef gchar *(*GbHtmlDocumentTransform) (GbHtmlDocument *document,
+                                           const gchar    *content);
+
+GType          gb_html_document_get_type           (void);
+GtkTextBuffer *gb_html_document_get_buffer         (GbHtmlDocument          *document);
+void           gb_html_document_set_transform_func (GbHtmlDocument          *document,
+                                                    GbHtmlDocumentTransform  transform);
+gchar         *gb_html_document_get_content        (GbHtmlDocument          *document);
+gchar         *gb_html_markdown_transform          (GbHtmlDocument          *document,
+                                                    const gchar             *content);
 
 G_END_DECLS
 
diff --git a/src/html/gb-html-view.c b/src/html/gb-html-view.c
index 6968fd6..88d1dda 100644
--- a/src/html/gb-html-view.c
+++ b/src/html/gb-html-view.c
@@ -58,9 +58,7 @@ gb_html_view_changed (GbHtmlView    *view,
                       GtkTextBuffer *buffer)
 {
   GbHtmlViewPrivate *priv;
-  GtkTextIter begin;
-  GtkTextIter end;
-  gchar *content = NULL;
+  gchar *content;
   gchar *base_uri = NULL;
 
   ENTRY;
@@ -87,9 +85,7 @@ gb_html_view_changed (GbHtmlView    *view,
         }
     }
 
-  gtk_text_buffer_get_bounds (buffer, &begin, &end);
-  content = gtk_text_buffer_get_text (buffer, &begin, &end, TRUE);
-
+  content = gb_html_document_get_content (view->priv->document);
   webkit_web_view_load_html (view->priv->web_view, content, base_uri);
 
   g_free (content);