[evolution/webkit-composer] Convert HTML emails to plain text when opening them in plain text mode

[Tomas Popela <tpopela src gnome org>]

commit 5477ab5dd3b2031ae06d78a420f859251ac45ae7
Author: Tomas Popela <tpopela redhat com>
Date:   Fri Oct 11 14:39:38 2013 +0200

    Convert HTML emails to plain text when opening them in plain text mode
    
    To do that we are creating another WebKitWebView, loading given HTML
    there and after it's loaded we take the innerText of the body.

 e-util/e-editor-widget.c |  148 ++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 144 insertions(+), 4 deletions(-)
---
diff --git a/e-util/e-editor-widget.c b/e-util/e-editor-widget.c
index 15b1b6b..d26c1b5 100644
--- a/e-util/e-editor-widget.c
+++ b/e-util/e-editor-widget.c
@@ -2278,7 +2278,7 @@ process_elements (WebKitDOMNode *node,
                        g_string_append (buffer, content);
                        g_free (tmp);
                        g_free (content);
-               } else {
+               } else if (!WEBKIT_DOM_IS_COMMENT (child)) {
                        /* Leave caret position untouched */
                        if (element_has_id (WEBKIT_DOM_ELEMENT (child), "-x-evo-caret-position")) {
                                if (!process_nodes) {
@@ -2456,7 +2456,8 @@ e_editor_widget_set_html_mode (EEditorWidget *widget,
                plain = changing_composer_mode_get_text_plain (widget);
 
                if (*plain)
-                       e_editor_widget_set_text_html (widget, plain);
+                       webkit_web_view_load_string (
+                               WEBKIT_WEB_VIEW (widget), plain, NULL, NULL, "file://");
 
                g_free (plain);
        }
@@ -2662,6 +2663,140 @@ e_editor_widget_get_text_plain (EEditorWidget *widget)
        return g_string_free (plain_text, FALSE);
 }
 
+static void
+html_plain_text_convertor_load_status_changed (WebKitWebView *web_view,
+                                               GParamSpec *pspec,
+                                               EEditorWidget *widget)
+{
+       WebKitLoadStatus status;
+       WebKitDOMDocument *document_convertor;
+       WebKitDOMDocument *document;
+       WebKitDOMElement *paragraph;
+       WebKitDOMElement *blockquote;
+       gchar *inner_text;
+
+       status = webkit_web_view_get_load_status (web_view);
+       if (status != WEBKIT_LOAD_FINISHED)
+               return;
+
+       document_convertor = webkit_web_view_get_dom_document (web_view);
+       document = webkit_web_view_get_dom_document (WEBKIT_WEB_VIEW (widget));
+
+       /* Get innertText from convertor */
+       inner_text = webkit_dom_html_element_get_inner_text (webkit_dom_document_get_body 
(document_convertor));
+       /* And set it as body to composer */
+       paragraph = webkit_dom_document_get_element_by_id (document, "-x-evo-input-start");
+       blockquote = webkit_dom_document_query_selector (document_convertor, "blockquote[type|=cite]", NULL);
+
+       if (!paragraph) {
+               WebKitDOMElement *element;
+
+               element = webkit_dom_document_create_element (document, "div", NULL);
+               element_add_class (element, "-x-evo-paragraph");
+               webkit_dom_html_element_set_id (WEBKIT_DOM_HTML_ELEMENT (element), "-x-evo-input-start");
+               webkit_dom_node_append_child (
+                       WEBKIT_DOM_NODE (webkit_dom_document_get_body (document)),
+                       WEBKIT_DOM_NODE (element),
+                       NULL);
+               paragraph = webkit_dom_document_get_element_by_id (document, "-x-evo-input-start");
+       }
+
+       if (paragraph) {
+               if (blockquote) {
+                       EEditorSelection *selection;
+                       WebKitDOMNode *blockquote_clone;
+                       WebKitDOMElement *pre;
+                       gchar *style_value;
+                       WebKitDOMNodeList *list;
+                       gint length, ii;
+
+                       selection = e_editor_widget_get_selection (widget);
+                       e_editor_selection_save_caret_position (selection);
+
+                       blockquote_clone = webkit_dom_node_clone_node (WEBKIT_DOM_NODE (blockquote), FALSE);
+                       pre = webkit_dom_document_create_element (document, "pre", NULL);
+
+                       style_value =
+                               g_strdup_printf (
+                                       "word-wrap: normal; "
+                                       "width: %dch",
+                                       e_editor_selection_get_word_wrap_length (selection));
+
+                       webkit_dom_element_set_attribute (
+                               WEBKIT_DOM_ELEMENT (blockquote_clone),
+                               "style",
+                               style_value,
+                               NULL);
+
+                       g_free (style_value);
+
+                       webkit_dom_html_element_set_inner_text (
+                               WEBKIT_DOM_HTML_ELEMENT (pre), inner_text, NULL);
+                       webkit_dom_node_append_child (
+                               blockquote_clone,
+                               WEBKIT_DOM_NODE (pre),
+                               NULL);
+                       webkit_dom_node_insert_before (
+                               webkit_dom_node_get_parent_node (WEBKIT_DOM_NODE (paragraph)),
+                               blockquote_clone,
+                               webkit_dom_node_get_next_sibling (WEBKIT_DOM_NODE (paragraph)),
+                               NULL);
+
+                       e_editor_selection_wrap_paragraph (
+                               selection,
+                               pre);
+
+                       /* Clean after wrapping */
+                       list = webkit_dom_document_query_selector_all (
+                                       document,
+                                       "br.-x-evo-wrap-br",
+                                       NULL);
+
+                       length = webkit_dom_node_list_get_length (list);
+                       for (ii = 0; ii < length; ii++) {
+                               WebKitDOMNode *br;
+
+                               br = webkit_dom_node_list_item (list, ii);
+
+                               webkit_dom_element_remove_attribute (
+                                       WEBKIT_DOM_ELEMENT (br),
+                                       "class");
+                       }
+
+                       e_editor_widget_quote_plain_text (widget);
+
+                       e_editor_selection_restore_caret_position (selection);
+               } else {
+                       webkit_dom_html_element_set_inner_text (
+                               WEBKIT_DOM_HTML_ELEMENT (paragraph), inner_text, NULL);
+               }
+       }
+
+       e_editor_widget_force_spellcheck (widget);
+       g_free (inner_text);
+}
+
+static void
+convert_html_to_plain_text (EEditorWidget *widget,
+                            const gchar *html)
+{
+       /* FIXME Clean this convertor's web_view */
+       WebKitWebView *web_view = WEBKIT_WEB_VIEW(webkit_web_view_new());
+       WebKitWebSettings *settings = webkit_web_view_get_settings (web_view);
+
+       g_object_set (
+               G_OBJECT (settings),
+               "enable-scripts", FALSE,
+               "enable-plugins", FALSE,
+               NULL);
+
+       g_signal_connect (
+               web_view, "notify::load-status",
+               G_CALLBACK (html_plain_text_convertor_load_status_changed), widget);
+
+       webkit_web_view_load_string (web_view, html, NULL, NULL, "file://");
+}
+
 /**
  * e_editor_widget_set_text_html:
  * @widget: an #EEditorWidget
@@ -2675,8 +2810,13 @@ e_editor_widget_set_text_html (EEditorWidget *widget,
 {
        widget->priv->reload_in_progress = TRUE;
 
-       webkit_web_view_load_string (
-               WEBKIT_WEB_VIEW (widget), text, NULL, NULL, "file://");
+       /* Only convert messages that are in HTML */
+       if (strstr (text, "<!-- text/html -->") && !widget->priv->html_mode) {
+               convert_html_to_plain_text (widget, text);
+       } else {
+               webkit_web_view_load_string (
+                       WEBKIT_WEB_VIEW (widget), text, NULL, NULL, "file://");
+       }
 }
 
 /**