From ac114445ed6e5c8722a9eec0fe934df00c615f2d Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.me.uk>
Date: Thu, 1 Nov 2018 23:11:19 +0100
Subject: Implement "revert" in stylesheet editor

---
 src/stylesheet.c        | 22 +++++++++++++++++++++-
 src/stylesheet.h        |  4 ++++
 src/stylesheet_editor.c | 20 +++++++++++++++++---
 3 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/src/stylesheet.c b/src/stylesheet.c
index a057935..52bc4ff 100644
--- a/src/stylesheet.c
+++ b/src/stylesheet.c
@@ -230,7 +230,7 @@ int stylesheet_delete(Stylesheet *ss, const char *path, const char *key)
 
 void stylesheet_free(Stylesheet *ss)
 {
-	g_object_unref(ss->root);
+	json_node_unref(ss->root);
 	free(ss);
 }
 
@@ -259,3 +259,23 @@ int stylesheet_save(Stylesheet *ss, GFile *file)
 	g_object_unref(fh);
 	return 0;
 }
+
+
+char *stylesheet_data(Stylesheet *ss)
+{
+	return json_to_string(ss->root, FALSE);
+}
+
+
+void stylesheet_set_data(Stylesheet *ss, const char *data)
+{
+	JsonNode *new_root;
+	GError *err = NULL;
+	new_root = json_from_string(data, &err);
+	if ( new_root == NULL ) {
+		fprintf(stderr, "Internal parse error: %s\n", err->message);
+		return;
+	}
+	json_node_unref(ss->root);
+	ss->root = new_root;
+}
diff --git a/src/stylesheet.h b/src/stylesheet.h
index 537b2f9..16d0a0a 100644
--- a/src/stylesheet.h
+++ b/src/stylesheet.h
@@ -36,6 +36,10 @@ extern Stylesheet *stylesheet_load(GFile *file);
 
 extern int stylesheet_save(Stylesheet *ss, GFile *file);
 
+extern char *stylesheet_data(Stylesheet *ss);
+
+extern void stylesheet_set_data(Stylesheet *ss, const char *data);
+
 extern int parse_colour_duo(const char *a, GdkRGBA *col1, GdkRGBA *col2);
 
 extern char *stylesheet_lookup(Stylesheet *ss, const char *path, const char *key);
diff --git a/src/stylesheet_editor.c b/src/stylesheet_editor.c
index 55ac3a9..0f5b908 100644
--- a/src/stylesheet_editor.c
+++ b/src/stylesheet_editor.c
@@ -44,6 +44,7 @@ G_DEFINE_TYPE_WITH_CODE(StylesheetEditor, stylesheet_editor,
 struct _sspriv
 {
 	struct presentation *p;
+	char *ssdata;
 };
 
 
@@ -315,9 +316,12 @@ static void update_spacing(struct presentation *p, const char *style_name,
 }
 
 
-static void revert_sig(GtkButton *button, StylesheetEditor *widget)
+static void revert_sig(GtkButton *button, StylesheetEditor *se)
 {
-	printf("click revert!\n");
+	stylesheet_set_data(se->priv->p->stylesheet,
+	                    se->priv->ssdata);
+	set_values_from_presentation(se);
+	g_signal_emit_by_name(se, "changed");
 }
 
 
@@ -491,6 +495,14 @@ static void narrative_paraspace_sig(GtkSpinButton *widget, StylesheetEditor *se)
 }
 
 
+static void stylesheet_editor_finalize(GObject *obj)
+{
+	StylesheetEditor *se = COLLOQUIUM_STYLESHEET_EDITOR(obj);
+	free(se->priv->ssdata);
+	G_OBJECT_CLASS(stylesheet_editor_parent_class)->finalize(obj);
+}
+
+
 static void stylesheet_editor_init(StylesheetEditor *se)
 {
 	se->priv = G_TYPE_INSTANCE_GET_PRIVATE(se, COLLOQUIUM_TYPE_STYLESHEET_EDITOR,
@@ -512,7 +524,7 @@ void stylesheet_editor_class_init(StylesheetEditorClass *klass)
 	                                    "/uk/me/bitwiz/Colloquium/stylesheeteditor.ui");
 
 	g_type_class_add_private(gobject_class, sizeof(StylesheetEditorPrivate));
-
+	gobject_class->finalize = stylesheet_editor_finalize;
 
 	/* Narrative style */
 	SE_BIND_CHILD(narrative_style_font, narrative_font_sig);
@@ -570,6 +582,8 @@ StylesheetEditor *stylesheet_editor_new(struct presentation *p)
 	se->priv->p = p;
 	set_values_from_presentation(se);
 
+	se->priv->ssdata = stylesheet_data(p->stylesheet);
+
 	return se;
 }
 
-- 
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