load.js 7.39 KB
Newer Older
jatuporn Tonggasem's avatar
jatuporn Tonggasem committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254
var debug = require('debug')('nodemon');
var fs = require('fs');
var path = require('path');
var exists = fs.exists || path.exists;
var utils = require('../utils');
var rules = require('../rules');
var parse = require('../rules/parse');
var exec = require('./exec');
var defaults = require('./defaults');

module.exports = load;
module.exports.mutateExecOptions = mutateExecOptions;

var existsSync = fs.existsSync || path.existsSync;

function findAppScript() {
  // nodemon has been run alone, so try to read the package file
  // or try to read the index.js file
  if (existsSync('./index.js')) {
    return 'index.js';
  }
}

/**
 * Load the nodemon config, first reading the global root/nodemon.json, then
 * the local nodemon.json to the exec and then overwriting using any user
 * specified settings (i.e. from the cli)
 *
 * @param  {Object} settings user defined settings
 * @param  {Function} ready    callback that receives complete config
 */
function load(settings, options, config, callback) {
  config.loaded = [];
  // first load the root nodemon.json
  loadFile(options, config, utils.home, function (options) {
    // then load the user's local configuration file
    if (settings.configFile) {
      options.configFile = path.resolve(settings.configFile);
    }
    loadFile(options, config, process.cwd(), function (options) {
      // Then merge over with the user settings (parsed from the cli).
      // Note that merge protects and favours existing values over new values,
      // and thus command line arguments get priority
      options = utils.merge(settings, options);

      // legacy support
      if (!Array.isArray(options.ignore)) {
        options.ignore = [options.ignore];
      }

      if (!options.ignoreRoot) {
        options.ignoreRoot = defaults.ignoreRoot;
      }

      // blend the user ignore and the default ignore together
      if (options.ignoreRoot && options.ignore) {
        if (!Array.isArray(options.ignoreRoot)) {
          options.ignoreRoot = [options.ignoreRoot];
        }
        options.ignore = options.ignoreRoot.concat(options.ignore);
      } else {
        options.ignore = defaults.ignore.concat(options.ignore);
      }


      // add in any missing defaults
      options = utils.merge(options, defaults);

      if (!options.script && !options.exec) {
        var found = findAppScript();
        if (found) {
          if (!options.args) {
            options.args = [];
          }
          // if the script is found as a result of not being on the command
          // line, then we move any of the pre double-dash args in execArgs
          const n = options.scriptPosition || options.args.length;
          options.execArgs = (options.execArgs || [])
            .concat(options.args.splice(0, n));
          options.scriptPosition = null;

          options.script = found;
        }
      }

      mutateExecOptions(options);

      if (options.quiet) {
        utils.quiet();
      }

      if (options.verbose) {
        utils.debug = true;
      }

      // simplify the ready callback to be called after the rules are normalised
      // from strings to regexp through the rules lib. Note that this gets
      // created *after* options is overwritten twice in the lines above.
      var ready = function (options) {
        normaliseRules(options, callback);
      };

      // if we didn't pick up a nodemon.json file & there's no cli ignores
      // then try loading an old style .nodemonignore file
      if (config.loaded.length === 0) {
        var legacy = loadLegacyIgnore.bind(null, options, config, ready);

        // first try .nodemonignore, if that doesn't exist, try nodemon-ignore
        return legacy('.nodemonignore', function () {
          legacy('nodemon-ignore', function (options) {
            ready(options);
          });
        });
      }

      ready(options);
    });
  });
}

/**
 * Loads the old style nodemonignore files which is a list of patterns
 * in a file to ignore
 *
 * @param  {Object} options    nodemon user options
 * @param  {Function} success
 * @param  {String} filename   ignore file (.nodemonignore or nodemon-ignore)
 * @param  {Function} fail     (optional) failure callback
 */
function loadLegacyIgnore(options, config, success, filename, fail) {
  var ignoreFile = path.join(process.cwd(), filename);

  exists(ignoreFile, function (exists) {
    if (exists) {
      config.loaded.push(ignoreFile);
      return parse(ignoreFile, function (error, rules) {
        options.ignore = rules.raw;
        success(options);
      });
    }

    if (fail) {
      fail(options);
    } else {
      success(options);
    }
  });
}

function normaliseRules(options, ready) {
  // convert ignore and watch options to rules/regexp
  rules.watch.add(options.watch);
  rules.ignore.add(options.ignore);

  // normalise the watch and ignore arrays
  options.watch = options.watch === false ? false : rules.rules.watch;
  options.ignore = rules.rules.ignore;

  ready(options);
}

/**
 * Looks for a config in the current working directory, and a config in the
 * user's home directory, merging the two together, giving priority to local
 * config. This can then be overwritten later by command line arguments
 *
 * @param  {Function} ready callback to pass loaded settings to
 */
function loadFile(options, config, dir, ready) {
  if (!ready) {
    ready = function () { };
  }

  var callback = function (settings) {
    // prefer the local nodemon.json and fill in missing items using
    // the global options
    ready(utils.merge(settings, options));
  };

  if (!dir) {
    return callback({});
  }

  var filename = options.configFile || path.join(dir, 'nodemon.json');

  if (config.loaded.indexOf(filename) !== -1) {
    // don't bother re-parsing the same config file
    return callback({});
  }

  fs.readFile(filename, 'utf8', function (err, data) {
    if (err) {
      if (err.code === 'ENOENT') {
        if (!options.configFile && dir !== utils.home) {
          // if no specified local config file and local nodemon.json
          // doesn't exist, try the package.json
          return loadPackageJSON(config, callback);
        }
      }
      return callback({});
    }

    var settings = {};

    try {
      settings = JSON.parse(data.toString('utf8').replace(/^\uFEFF/, ''));
      if (!filename.endsWith('package.json') || settings.nodemonConfig) {
        config.loaded.push(filename);
      }
    } catch (e) {
      utils.log.fail('Failed to parse config ' + filename);
      console.error(e);
      process.exit(1);
    }

    // options values will overwrite settings
    callback(settings);
  });
}

function loadPackageJSON(config, ready) {
  if (!ready) {
    ready = () => { };
  }

  const dir = process.cwd();
  const filename = path.join(dir, 'package.json');
  const packageLoadOptions = { configFile: filename };
  return loadFile(packageLoadOptions, config, dir, settings => {
    ready(settings.nodemonConfig || {});
  });
}

function mutateExecOptions(options) {
  // work out the execOptions based on the final config we have
  options.execOptions = exec({
    script: options.script,
    exec: options.exec,
    args: options.args,
    scriptPosition: options.scriptPosition,
    nodeArgs: options.nodeArgs,
    execArgs: options.execArgs,
    ext: options.ext,
    env: options.env,
  }, options.execMap);

  // clean up values that we don't need at the top level
  delete options.scriptPosition;
  delete options.script;
  delete options.args;
  delete options.ext;

  return options;
}