From 541724fb0dc4ba82bce76ad779770d37266c1818 Mon Sep 17 00:00:00 2001
From: Michael Drake <tlsa@netsurf-browser.org>
Date: Tue, 3 Sep 2013 19:43:59 +0100
Subject: Add hotlist iteration function.

---
 desktop/hotlist.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 desktop/hotlist.h | 48 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)

diff --git a/desktop/hotlist.c b/desktop/hotlist.c
index 9f981387c..68caa2097 100644
--- a/desktop/hotlist.c
+++ b/desktop/hotlist.c
@@ -948,6 +948,67 @@ nserror hotlist_export(const char *path, const char *title)
 }
 
 
+struct hotlist_iterate_ctx {
+	hotlist_folder_enter_cb enter_cb;
+	hotlist_address_cb address_cb;
+	hotlist_folder_leave_cb leave_cb;
+	void *ctx;
+};
+/** Callback for hotlist_iterate node entering */
+static nserror hotlist_iterate_enter_cb(void *ctx, void *node_data,
+		enum treeview_node_type type, bool *abort)
+{
+	struct hotlist_iterate_ctx *data = ctx;
+
+	if (type == TREE_NODE_ENTRY && data->address_cb != NULL) {
+		struct hotlist_entry *e = node_data;
+		data->address_cb(data->ctx, e->url,
+				e->data[HL_TITLE].value);
+
+	} else if (type == TREE_NODE_FOLDER && data->enter_cb != NULL) {
+		struct hotlist_folder *f = node_data;
+		data->enter_cb(data->ctx, f->data.value);
+	}
+
+	return NSERROR_OK;
+}
+/** Callback for hotlist_iterate node leaving */
+static nserror hotlist_iterate_leave_cb(void *ctx, void *node_data,
+		enum treeview_node_type type, bool *abort)
+{
+	struct hotlist_iterate_ctx *data = ctx;
+
+	if (type == TREE_NODE_FOLDER && data->leave_cb != NULL) {
+		data->leave_cb(data->ctx);
+	}
+
+	return NSERROR_OK;
+}
+/* Exported interface, documented in hotlist.h */
+nserror hotlist_iterate(void *ctx,
+		hotlist_folder_enter_cb enter_cb,
+		hotlist_address_cb address_cb,
+		hotlist_folder_leave_cb leave_cb)
+{
+	struct hotlist_iterate_ctx data;
+	nserror err;
+
+	data.enter_cb = enter_cb;
+	data.address_cb = address_cb;
+	data.leave_cb = leave_cb;
+	data.ctx = ctx;
+
+	err = treeview_walk(hl_ctx.tree, NULL,
+			hotlist_iterate_enter_cb,
+			hotlist_iterate_leave_cb,
+			&data, TREE_NODE_ENTRY | TREE_NODE_FOLDER);
+	if (err != NSERROR_OK)
+		return err;
+
+	return NSERROR_OK;
+}
+
+
 /**
  * Initialise the treeview entry feilds
  *
diff --git a/desktop/hotlist.h b/desktop/hotlist.h
index 121eb95ef..c6e74f2cc 100644
--- a/desktop/hotlist.h
+++ b/desktop/hotlist.h
@@ -117,6 +117,54 @@ nserror hotlist_add_folder(const char *title, bool at_y, int y);
  */
 nserror hotlist_export(const char *path, const char *title);
 
+/**
+ * Client callback for hotlist_iterate, reporting entry into folder
+ *
+ * \param ctx		Client context
+ * \param title		The entered folder's title
+ * \return NSERROR_OK on success, or appropriate error otherwise
+ */
+typedef nserror (*hotlist_folder_enter_cb)(void *ctx, const char *title);
+
+/**
+ * Client callback for hotlist_iterate, reporting a hotlist address
+ *
+ * \param ctx		Client context
+ * \param url		The entry's address
+ * \param title		The entry's title
+ * \return NSERROR_OK on success, or appropriate error otherwise
+ */
+typedef nserror (*hotlist_address_cb)(void *ctx, nsurl *url, const char *title);
+
+/**
+ * Client callback for hotlist_iterate, reporting a hotlist folder departure
+ *
+ * \param ctx		Client context
+ * \param title		The departed folder's title
+ * \return NSERROR_OK on success, or appropriate error otherwise
+ */
+typedef nserror (*hotlist_folder_leave_cb)(void *ctx);
+
+
+/**
+ * Walk (depth first) the hotlist, calling callbacks on entering folders,
+ * address nodes, and on leaving folders.
+ *
+ * \param ctx		Client context, passed back to callback function
+ * \param enter_cb	Function to call on entering nodes, or NULL
+ * \param address_cb	Function to call on address nodes, or NULL
+ * \param leave_cb	Function to call on leaving nodes, or NULL
+ * \return NSERROR_OK on success, or appropriate error otherwise
+ *
+ * Example usage: Generate a menu containing hotlist entries.  For flat list
+ *                set enter_cb and leave_cb to NULL, or for hierarchical menu
+ *                provide the folder callbacks.
+ */
+nserror hotlist_iterate(void *ctx,
+		hotlist_folder_enter_cb enter_cb,
+		hotlist_address_cb address_cb,
+		hotlist_folder_leave_cb leave_cb);
+
 /**
  * Redraw the hotlist.
  *
-- 
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