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/**
* @provides javelin-behavior-phabricator-oncopy
* @requires javelin-behavior
* javelin-dom
*/
/**
* Tools like Paste and Differential don't normally respond to the clipboard
* 'copy' operation well, because when a user copies text they'll get line
* numbers and other metadata.
*
* To improve this behavior, applications can embed markers that delimit
* metadata (left of the marker) from content (right of the marker). When
* we get a copy event, we strip out all the metadata and just copy the
* actual text.
*/
JX.behavior('phabricator-oncopy', function() {
var zws = "\u200B"; // Unicode Zero-Width Space
document.body.oncopy = function(e) {
var selection = window.getSelection();
var text = selection.toString();
if (text.indexOf(zws) == -1) {
// If there's no marker in the text, just let it copy normally.
return;
}
var result = [];
// Strip everything before the marker (and the marker itself) out of the
// text. If a line doesn't have the marker, throw it away (the assumption
// is that it's a line number or part of some other meta-text).
var lines = text.split("\n");
var pos;
for (var ii = 0; ii < lines.length; ii++) {
pos = lines[ii].indexOf(zws);
if (pos == -1 && ii !== 0) {
continue;
}
result.push(lines[ii].substring(pos + 1));
}
result = result.join("\n");
if (e.clipboardData) {
// Safari and Chrome support this easy, straightforward mechanism.
e.clipboardData.setData('Text', result);
e.preventDefault();
} else {
// In Firefox, we have to create a <pre> and select the text in it, then
// let the copy event fire. It has to be a <pre> because Firefox won't
// copy returns properly out of a div, even if it has 'whitespace: pre'.
// There's been a bug open for 10 (!) years:
//
// https://bugzilla.mozilla.org/show_bug.cgi?id=116083
var style = {
position: 'absolute',
left: '-10000px'
};
var pre = JX.$N('pre', {style: style}, result);
document.body.appendChild(pre);
// Select the text in the <pre>.
var range = document.createRange();
range.selectNodeContents(pre);
selection.removeAllRanges();
selection.addRange(range);
setTimeout(function() { JX.DOM.remove(pre); }, 0);
// TODO: I tried to restore the old selection range but it doesn't seem
// to work or give me any errors. So you lose your selection when you
// copy. Oh well?
}
};
});

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