[libgepub] Update the chapter number when the page changes

[Daniel Garcia Moreno <danigm src gnome org>]

commit a5f2952e2ea047e2fd90bc31e7270667de7d5978
Author: IBBoard <dev ibboard co uk>
Date:   Sat Apr 27 11:29:04 2019 +0100

    Update the chapter number when the page changes
    
    This ensures that hyperlinks between pages trigger chapter number
    change signals, which let UIs update their position
    
    Note: This currently triggers a page reload, which breaks links
    to anchors within pages

 libgepub/gepub-doc.c    | 10 +++++++++-
 libgepub/gepub-widget.c | 24 ++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)
---
diff --git a/libgepub/gepub-doc.c b/libgepub/gepub-doc.c
index e486bf5..53c2734 100644
--- a/libgepub/gepub-doc.c
+++ b/libgepub/gepub-doc.c
@@ -966,13 +966,21 @@ gepub_doc_resource_uri_to_chapter (GepubDoc *doc,
     gchar *key;
     GepubResource *res;
     gchar *id = NULL;
+    const gchar *_uri;
+
+    if (uri[0] == '/') {
+        _uri = uri + 1;
+    }
+    else {
+        _uri = uri;
+    }
 
     g_return_val_if_fail (GEPUB_IS_DOC (doc), -1);
     g_return_val_if_fail (doc->spine != NULL, -1);
 
     g_hash_table_iter_init (&iter, doc->resources);
     while (g_hash_table_iter_next (&iter, (gpointer *)&key, (gpointer *)&res)) {
-        if (!g_strcmp0 (res->uri, uri)) {
+        if (!g_strcmp0 (res->uri, _uri)) {
             id = key;
             break;
         }
diff --git a/libgepub/gepub-widget.c b/libgepub/gepub-widget.c
index fce91c5..25da498 100644
--- a/libgepub/gepub-widget.c
+++ b/libgepub/gepub-widget.c
@@ -226,6 +226,29 @@ reload_length_cb (GtkWidget *widget,
     }
 }
 
+static void
+set_current_chapter_by_uri (WebKitWebView  *web_view)
+{
+    GepubWidget *widget = GEPUB_WIDGET (web_view);
+    const gchar *uri_string;
+    SoupURI *uri;
+    const gchar *path;
+    gint chapter;
+
+    uri_string = webkit_web_view_get_uri (web_view);
+
+    if (g_strcmp0 ("about:blank", uri_string)) {
+        uri = soup_uri_new (uri_string);
+        path = soup_uri_get_path (uri);
+        chapter = gepub_doc_resource_uri_to_chapter (widget->doc, path);
+        gepub_doc_set_chapter (widget->doc, chapter);
+        soup_uri_free (uri);
+    }
+    // Else we're on the cover or table of contents (and can't tell which)
+    // but we can only get there through setting the chapter number
+    // so we don't need to do anything here
+}
+
 static void
 docready_cb (WebKitWebView  *web_view,
              WebKitLoadEvent load_event,
@@ -235,6 +258,7 @@ docready_cb (WebKitWebView  *web_view,
 
     if (load_event == WEBKIT_LOAD_FINISHED) {
         reload_length_cb (GTK_WIDGET (widget), NULL, NULL);
+        set_current_chapter_by_uri (web_view);
     }
 }