active-line.js
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	// Because sometimes you need to style the cursor's line.
	//
	// Adds an option 'styleActiveLine' which, when enabled, gives the
	// active line's wrapping <div> the CSS class "CodeMirror-activeline",
	// and gives its background <div> the class "CodeMirror-activeline-background".

	(function() {
	"use strict";
	var WRAP_CLASS = "CodeMirror-activeline";
	var BACK_CLASS = "CodeMirror-activeline-background";

	CodeMirror.defineOption("styleActiveLine", false, function(cm, val, old) {
	var prev = old && old != CodeMirror.Init;
	if (val && !prev) {
	updateActiveLine(cm);
	cm.on("cursorActivity", updateActiveLine);
	} else if (!val && prev) {
	cm.off("cursorActivity", updateActiveLine);
	clearActiveLine(cm);
	delete cm.state.activeLine;
	}
	});

	function clearActiveLine(cm) {
	if ("activeLine" in cm.state) {
	cm.removeLineClass(cm.state.activeLine, "wrap", WRAP_CLASS);
	cm.removeLineClass(cm.state.activeLine, "background", BACK_CLASS);
	}
	}

	function updateActiveLine(cm) {
	var line = cm.getLineHandle(cm.getCursor().line);
	if (cm.state.activeLine == line) return;
	clearActiveLine(cm);
	cm.addLineClass(line, "wrap", WRAP_CLASS);
	cm.addLineClass(line, "background", BACK_CLASS);
	cm.state.activeLine = line;
	}
	})();