From 1dc8dba07c9c57016a7bac4dd8ce3804024597b9 Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <fox@madoka.spb.ru>
Date: Mon, 4 Dec 2006 09:26:09 +0100
Subject: add experimental operation history stack

---
 feedlist.js  |  7 +++++-
 functions.js | 16 ++++++------
 tt-rss.js    | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 viewfeed.js  |  6 ++++-
 4 files changed, 101 insertions(+), 10 deletions(-)

diff --git a/feedlist.js b/feedlist.js
index 53fc4c6e4..d324c6a80 100644
--- a/feedlist.js
+++ b/feedlist.js
@@ -14,11 +14,16 @@ function feedlist_callback() {
 	}
 }
 
-function viewfeed(feed, subop, is_cat, subop_param) {
+function viewfeed(feed, subop, is_cat, subop_param, skip_history) {
 	try {
 
 		enableHotkeys();
 
+		if (!skip_history) {
+			history_push('FEED:' + feed + ':' + subop + ':' + is_cat +
+				':' + subop_param);
+		}
+
 		var toolbar_query = Form.serialize("main_toolbar_form");
 		var toolbar_form = document.forms["main_toolbar_form"];
 
diff --git a/functions.js b/functions.js
index 4b610816d..6512d6adc 100644
--- a/functions.js
+++ b/functions.js
@@ -226,14 +226,6 @@ function hotkey_handler(e) {
 			}
 		}
 		
-		if (typeof localHotkeyHandler != 'undefined') {
-			try {
-				localHotkeyHandler(keycode);
-			} catch (e) {
-				exception_error("hotkey_handler, local:", e);
-			}
-		}
-
 		if (keycode == 68 && shift_key) { // d
 			if (!debug_mode_enabled) {
 				document.getElementById('debug_output').style.display = 'block';
@@ -245,6 +237,14 @@ function hotkey_handler(e) {
 			debug_mode_enabled = !debug_mode_enabled;
 		}
 
+		if (typeof localHotkeyHandler != 'undefined') {
+			try {
+				return localHotkeyHandler(e);
+			} catch (e) {
+				exception_error("hotkey_handler, local:", e);
+			}
+		}
+
 		debug("KP=" + keycode);
 	} catch (e) {
 		exception_error("hotkey_handler", e);
diff --git a/tt-rss.js b/tt-rss.js
index 472c90a6b..863020505 100644
--- a/tt-rss.js
+++ b/tt-rss.js
@@ -20,6 +20,8 @@ var xmlhttp_ctr = Ajax.getTransport();
 
 var init_params = new Object();
 
+var op_history = new Array();
+
 function toggleTags() {
 	display_tags = !display_tags;
 
@@ -654,3 +656,83 @@ function feedEditSave() {
 	} 
 }
 
+function localHotkeyHandler(e) {
+
+	var keycode;
+
+	if (window.event) {
+		keycode = window.event.keyCode;
+	} else if (e) {
+		keycode = e.which;
+	}
+
+	var shift_key = false;
+
+	try {
+		shift_key = e.shiftKey;
+	} catch (e) { }
+
+	if (keycode == 66 && shift_key) { // shift-B
+
+		var op = history_pop();
+
+		if (op) {
+			var op_s = op.split(":");
+
+			var i;
+			for (i = 0; i < op_s.length; i++) {
+				if (op_s[i] == 'undefined') {
+					op_s[i] = undefined;
+				}
+
+				if (op_s[i] == 'false') {
+					op_s[i] = false;
+				}
+
+				if (op_s[i] == 'true') {
+					op_s[i] = true;
+				}
+				
+			}
+
+			debug("history split: " + op_s);
+
+			if (op_s[0] == "ARTICLE") {
+				debug("history: reverting to article " + op_s[1] + "/" + op_s[2]);
+				view(op_s[1], op_s[2], true);
+			}
+
+			if (op_s[0] == "FEED") {
+				viewfeed(op_s[1], op_s[2], op_s[3], op_s[4], true);
+			}
+
+		} else {
+			notify("No operation to undo");
+		}
+
+		return false;
+
+	}	
+
+	debug("LKP=" + keycode);
+}
+
+function history_push(op) {
+	debug("history_push: " + op);
+	op_history.push(op);
+
+	while (op_history.length > 30) {
+		op_history.shift();
+	}
+}
+
+function history_pop() {
+	var op = op_history.pop();
+	debug("history_pop: " + op);
+	return op;
+}
+
+function history_clear() {
+	debug("history_clear");
+	op_history.clear();
+}
diff --git a/viewfeed.js b/viewfeed.js
index 7a499fd3b..155fdd841 100644
--- a/viewfeed.js
+++ b/viewfeed.js
@@ -51,10 +51,14 @@ function article_callback() {
 	}
 }
 
-function view(id, feed_id) {
+function view(id, feed_id, skip_history) {
 	
 	try {
 		debug("loading article: " + id + "/" + feed_id);
+
+		if (!skip_history) {
+			history_push("ARTICLE:" + id + ":" + feed_id);
+		}
 	
 		enableHotkeys();
 	
-- 
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