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Assignment-3/node_modules/nodemon/lib/config/load.js

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+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 === null ?
+            options.args.length : options.scriptPosition;
+
+          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;
+}