From 6a244552a58beafe64ab12142d5b98bec0c97c1b Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <noreply@fakecake.org>
Date: Mon, 2 Jul 2018 15:32:55 +0300
Subject: add toolbar button to jump back if following relative URL

---
 css/read.css |  4 ++--
 js/read.js   |  8 ++++++++
 read.html    | 20 ++++++++++++++++++++
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/css/read.css b/css/read.css
index d1cb1be..7495ad3 100644
--- a/css/read.css
+++ b/css/read.css
@@ -93,13 +93,13 @@
 
 @media (max-width: 767px) {
 	.toolbar {
-		width : 96px;
+		width : 105px;
 	}
 }
 
 @media (max-width: 576px) {
 	.toolbar {
-		width : 96px;
+		width : 105px;
 	}
 	#reader {
 		left : 24px;
diff --git a/js/read.js b/js/read.js
index 6d81cb5..779a112 100644
--- a/js/read.js
+++ b/js/read.js
@@ -314,4 +314,12 @@ function dict_lookup(word, callback) {
 	});
 }
 
+function open_previous_location(elem) {
+	var cfi = $(elem).attr("data-location-cfi");
 
+	if (cfi) {
+		window.book.rendition.display(cfi);
+	}
+
+	$(elem).fadeOut();
+}
diff --git a/read.html b/read.html
index c1983dd..ae1a008 100644
--- a/read.html
+++ b/read.html
@@ -191,6 +191,11 @@
 	</span>
 	<span class="toolbar">
 
+		<span class="prev_location_btn"
+			onclick="open_previous_location(this)" style="display : none">
+			<span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
+		</span>
+
 		<span onclick="request_fullscreen()">
 			<span class="glyphicon glyphicon-fullscreen" aria-hidden="true"></span>
 		</span>
@@ -432,6 +437,21 @@
 
 		rendition.hooks.content.register(function(contents) {
 
+			contents.on("linkClicked", function(href) {
+				console.log('linkClicked', href);
+
+				if (href.indexOf("://") == -1) {
+					$(".prev_location_btn")
+						.attr("data-location-cfi", book.rendition.currentLocation().start.cfi)
+						.show();
+
+					window.setTimeout(function() {
+						show_ui(true);
+					}, 50);
+				}
+
+			});
+
 			var base_url = window.location.href.match(/^.*\//)[0];
 			var res_names = [ "lib/bootstrap/v3/js/jquery.js", "lib/jquery.mobile.custom.js",
 				"js/reader.js", "js/dict.js" ];
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