CodeMirror.defineMode("diff", function() { var TOKEN_NAMES = { '+': 'tag', '-': 'string', '@': 'meta' }; return { token: function(stream) { var tw_pos = stream.string.search(/[\t ]+?$/); if (!stream.sol() || tw_pos === 0) { stream.skipToEnd(); return ("error " + ( TOKEN_NAMES[stream.string.charAt(0)] || '')).replace(/ $/, ''); } var token_name = TOKEN_NAMES[stream.peek()] || stream.skipToEnd(); if (tw_pos === -1) { stream.skipToEnd(); } else { stream.pos = tw_pos; } return token_name; } }; }); CodeMirror.defineMIME("text/x-diff", "diff");