// ==UserScript==// @name        Textarea Plus// @description	An userscript to improve plain textarea for code editing.// @namespace   eight04.blogspot.com// @include     http*// @version     1.0.2// @grant       GM_addStyle// ==/UserScript=="use strict";var textareaPlus = function(){var editor = {indent: indent,unindent: unindent,home: home,selectHome: selectHome,enter: enter};function selectionRange(data){return data.pos[1] - data.pos[0];}function insert(data, text){data.text = data.text.substr(0, data.pos[0]) + text + data.text.substr(data.pos[1]);data.pos[0] += text.length;data.pos[1] = data.pos[0];}function del(data){if (!selectionRange(data)) {data.pos[1]++;}insert(data, "");}function getLineStart(data){var pos = data.pos[0];if (data.text[pos] == "\n") {pos--;}var s = data.text.lastIndexOf("\n", pos);if (s < 0) {return 0;}return s + 1;}function getLineEnd(data){var s = data.text.indexOf("\n", data.pos[1]);if (s < 0) {return data.text.length;}return s;}function multiIndent(data){var lineStart = getLineStart(data), lineEnd = getLineEnd(data);var lines = data.text.substr(lineStart, lineEnd - lineStart);lines = lines.split("\n");for (var i = 0; i < lines.length; i++) {lines[i] = "\t" + lines[i];}lines = lines.join("\n");data.text = data.text.substr(0, lineStart) + lines + data.text.substr(lineEnd);data.pos[0] = lineStart;data.pos[1] = lineEnd + i;}function inMultiLine(data) {var s = data.text.indexOf("\n", data.pos[0]);if (s < 0) {return false;}return  s < data.pos[1];}function indent(data){if (!selectionRange(data)) {insert(data, "\t");if (data.pos[0] < getTextStart(data)) {home(data);}} else {if (inMultiLine(data)) {multiIndent(data);} else {insert(data, "\t");}}}function multiUnindent(data){var lineStart = getLineStart(data), lineEnd = getLineEnd(data);var lines = data.text.substr(lineStart, lineEnd - lineStart);lines = lines.split("\n");var len = 0;for (var i = 0; i < lines.length; i++) {var m = lines[i].match(/^(    | {0,3}\t?)(.*)$/);// console.log(m);len += m[1].length;lines[i] = m[2];}lines = lines.join("\n");data.text = data.text.substr(0, lineStart) + lines + data.text.substr(lineEnd);data.pos[0] = lineStart;data.pos[1] = lineEnd - len;}function backspace(data) {if (selectionRange(data)) {del(data);} else if (data.pos[0] > 0) {data.pos[0]--;del(data);}}function inText(data) {return getTextStart(data) <= data.pos[0];}function unindent(data) {if (inMultiLine(data)) {multiUnindent(data);} else if (data.text[data.pos[0] - 1] == "\t") {backspace(data);} else {multiUnindent(data);home(data);}}function searchFrom(text, re, pos) {pos = pos || 0;var t = text.substr(pos);var s = t.search(re);if (s < 0) {return -1;}return s + pos;}function getTextStart(data) {var lineStart = getLineStart(data);var pos = searchFrom(data.text, /[\S\n]/, lineStart);if (pos < 0 || data.text[pos] == "\n") {return getLineEnd(data);}return pos;}function isTextStart(data) {return getTextStart(data) == data.pos[0];}function home(data) {if (isTextStart(data)) {data.pos[0] = getLineStart(data);} else {data.pos[0] = getTextStart(data);}data.pos[1] = data.pos[0];}function selectHome(data) {var pos = data.pos[1];home(data);if (data.pos[0] > pos) {home(data);}data.pos[1] = pos;}function getIndents(data) {var lineStart = getLineStart(data);var len;var textStart = getTextStart(data);// console.log(textStart);if (textStart >= data.pos[0]) {len = data.pos[0] - lineStart;} else {len = textStart - lineStart;}return data.text.substr(lineStart, len);}function enter(data) {// console.log(data);var indents = getIndents(data);insert(data, "\n" + indents);}function init(node, command) {var data = {text: node.value,pos: [node.selectionStart, node.selectionEnd]};editor[command](data);node.value = data.text;node.setSelectionRange(data.pos[0], data.pos[1]);}return init;}();function validArea(area) {if (area.nodeName != "TEXTAREA") {return false;}if (area.dataset.textareaPlus === "false") {return false;}if (area.dataset.textareaPlus === "true") {return true;}var node = area;while ((node = node.parentNode) != document.body) {if (node.classList.contains("CodeMirror")) {area.dataset.textareaPlus = "false";return false;}}area.dataset.textareaPlus = "true";return true;}window.addEventListener("keydown", function(e){if (!validArea(e.target)) {return;}var command;if (e.keyCode == 9 && !e.ctrlKey && !e.altKey) {// tabif (e.shiftKey) {command = "unindent";} else {command = "indent";}} else if (e.keyCode == 13 && !e.ctrlKey && !e.altKey && !e.shiftKey) {// entercommand = "enter";} else if (e.keyCode == 36 && !e.ctrlKey && !e.altKey) {// homeif (!e.shiftKey) {command = "home";} else {command = "selectHome";}} else {return;}e.preventDefault();textareaPlus(e.target, command);});GM_addStyle("textarea {tab-size: 4; -moz-tab-size: 4; -o-tab-size: 4;}");