[PATCH v3 6/6] line-range-highlight: copy URL to clipboard on click

[Andy Green]

Since the only reason to click on the line number links
is to get the corresponding #URL to share, this patch
makes that process more convenient by copying the
highlit area, be it a single line or a range, to the
clipboard on each click of the line number links.

Signed-off-by: Andy Green <andy at warmcat.com>
---
 cgit.js |   36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/cgit.js b/cgit.js
index 2cfad29..e2c3799 100644
--- a/cgit.js
+++ b/cgit.js
@@ -89,8 +89,29 @@ function cgit_line_range_highlight()
 		e.scrollIntoView(true);
 }
 
+function cgit_copy_clipboard(value)
+{
+	var inp = document.createElement("textarea");
+	var e = document.getElementById("linenumber_td");
+
+	inp.type = "text";
+	inp.value = value;
+	/* hidden style stops it working for clipboard */
+	inp.setAttribute('readonly', '');
+	inp.style.position = "absolute";
+	inp.style.left = "-1000px";
+
+	e.appendChild(inp);
+
+	inp.select();
+
+	document.execCommand("copy");
+
+	inp.remove();
+}
+
 function cgit_line_range_click(e) {
-	var t = e.target.id;
+	var t = e.target.id, cp;
 
 	cgit_line_range_override = null;
 
@@ -101,13 +122,13 @@ function cgit_line_range_click(e) {
 	 * is called, and override it there.
 	 */
 
-	if (window.location.hash && window.location.hash.indexOf("-") < 0)
+	if (window.location.hash && window.location.hash.indexOf("-") < 0) {
 		if (parseInt(window.location.hash.substring(2)) <
 		    parseInt(t.substring(1))) /* forwards */
-			cgit_line_range_override =
+			cp = cgit_line_range_override =
 				window.location + '-' + t.substring(1);
 		else /* backwards */
-			cgit_line_range_override =
+			cp = cgit_line_range_override =
 				window.location.href.substring(0,
 					window.location.href.length -
 					window.location.hash.length) +
@@ -115,6 +136,13 @@ function cgit_line_range_click(e) {
 					window.location.href.substring(
 						window.location.href.length -
 						window.location.hash.length + 2);
+	} else
+		cp = window.location.href.substring(0,
+                                        window.location.href.length -
+                                        window.location.hash.length) +
+			'#n' + t.substring(1);
+
+	cgit_copy_clipboard(cp);
 }
 
 /* line range highlight */