makefile.js

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";

  var keywords = ["define", "endef", "undefine", "ifdef", "ifndef", "ifeq",
    "ifneq", "else", "endif", "include", "-include", "sinclude",
    "override", "export", "unexport", "private", "vpath"];
  var keywordsRegex = new RegExp("\\b((" + keywords.join(")|(") + "))");

  var operators = ["=", ":=", "::=", "\\+=", "\\?=", ":"];
  var operatorsRegex = new RegExp("((" + operators.join(")|(") + "))");

  var automaticVariables = ["\\$@", "\\$%", "\\$<", "\\$\\?", "\\$\\^",
    "\\$\\+", "\\$\\*"];
  var automaticVariablesRegex = new RegExp(
    "((" + automaticVariables.join(")|(") + "))");

  // Any sequence of characters not containing '#', ':', '='
  var variableNameRegex = /((?![#:=\s]).)*/;
  var usingVariableRegex = new RegExp(
    "\\$(\\((" + variableNameRegex.source + "(,\\s?)?)+" + "\\)|\\{(" +
    variableNameRegex.source + "(, \\s?)?)+" + "\\})");
  var definitionVariableRegex = new RegExp(
    variableNameRegex.source + "\\s*((" + operators.join(")|(") + "))");

  CodeMirror.registerHelper("hintWords", "makefile", keywords);

  CodeMirror.defineMode("makefile", function() {
    return {
      token: function(stream, state) {
        var ch = stream.peek();
        state.escaped = false;

        // Comments
        if (ch === '#') {
          stream.skipToEnd();
          return "comment";
        }
        // Operators
        if (stream.match(operatorsRegex))
          return "operator";
        // Keywords
        if (stream.match(keywordsRegex))
          return "keyword";
        // Using variables
        if (stream.match(usingVariableRegex) ||
            stream.match(automaticVariablesRegex)) {
          return 'variable-2';
        }
        // Variable definition
        if (stream.match(definitionVariableRegex)) {
          stream.backUp(1);
          return "def";
        }

        // nothing found, continue
        state.pairStart = false;
        state.escaped = (ch === '\\');
        stream.next();
        return null;
      },
      startState: function () {
        return {
          pair: false,
          pairStart: false,
          inDefinition: false,
          inInclude: false,
          continueString: false,
          pending: false,
        };
      },
      lineComment: '#',
    };
  });

  CodeMirror.defineMIME("text/x-makefile", "makefile");

});