<%= javascript_include_tag "/codemirror/lib/codemirror", "/codemirror/mode/javascript/javascript", "/codemirror/addon/hint/show-hint", "/codemirror/addon/hint/anyword-hint", "/codemirror/addon/edit/matchbrackets", "/codemirror/addon/hint/javascript-hint" %> <%= stylesheet_link_tag "/codemirror/lib/codemirror", "/codemirror/addon/hint/show-hint", "/codemirror/doc/docs", "/codemirror/addon/lint/lint" %>

CodeMirror

Any Word Completion

Any Word Completion Demo

(function() {
    "use strict";

var WORD = /[\w$]+/g, RANGE = 500;

CodeMirror.registerHelper("hint", "anyword", function(editor, options) {
    var word = options && options.word || WORD;
    var range = options && options.range || RANGE;
    var cur = editor.getCursor(), curLine = editor.getLine(cur.line);
    var start = cur.ch, end = start;
    while (end < curLine.length && word.test(curLine.charAt(end))) ++end;
    while (start && word.test(curLine.charAt(start - 1))) --start;
    var curWord = start != end && curLine.slice(start, end);

var list = [], seen = {};
    function scan(dir) {
    var line = cur.line, end = Math.min(Math.max(line + dir * range, editor.firstLine()), editor.lastLine()) + dir;
    for (; line != end; line += dir) {
    var text = editor.getLine(line), m;
    word.lastIndex = 0;
    while (m = word.exec(text)) {
    if ((!curWord || m[0].indexOf(curWord) == 0) && !seen.hasOwnProperty(m[0])) {
    seen[m[0]] = true;
    list.push(m[0]);
    }
    }
    }
    }
    scan(-1);
    scan(1);
    return {list: list, from: CodeMirror.Pos(cur.line, start), to: CodeMirror.Pos(cur.line, end)};
    });
    })();

Press ctrl-space to activate autocompletion. The completion uses the anyword-hint.js module, which simply looks at nearby words in the buffer and completes to those.