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qwen/nodejs/node_modules/nodemon/lib/config/exec.js

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+const path = require('path');
+const fs = require('fs');
+const existsSync = fs.existsSync;
+const utils = require('../utils');
+
+module.exports = exec;
+module.exports.expandScript = expandScript;
+
+/**
+ * Reads the cwd/package.json file and looks to see if it can load a script
+ * and possibly an exec first from package.main, then package.start.
+ *
+ * @return {Object} exec & script if found
+ */
+function execFromPackage() {
+  // doing a try/catch because we can't use the path.exist callback pattern
+  // or we could, but the code would get messy, so this will do exactly
+  // what we're after - if the file doesn't exist, it'll throw.
+  try {
+    // note: this isn't nodemon's package, it's the user's cwd package
+    var pkg = require(path.join(process.cwd(), 'package.json'));
+    if (pkg.main !== undefined) {
+      // no app found to run - so give them a tip and get the feck out
+      return { exec: null, script: pkg.main };
+    }
+
+    if (pkg.scripts && pkg.scripts.start) {
+      return { exec: pkg.scripts.start };
+    }
+  } catch (e) {}
+
+  return null;
+}
+
+function replace(map, str) {
+  var re = new RegExp('{{(' + Object.keys(map).join('|') + ')}}', 'g');
+  return str.replace(re, function (all, m) {
+    return map[m] || all || '';
+  });
+}
+
+function expandScript(script, ext) {
+  if (!ext) {
+    ext = '.js';
+  }
+  if (script.indexOf(ext) !== -1) {
+    return script;
+  }
+
+  if (existsSync(path.resolve(script))) {
+    return script;
+  }
+
+  if (existsSync(path.resolve(script + ext))) {
+    return script + ext;
+  }
+
+  return script;
+}
+
+/**
+ * Discovers all the options required to run the script
+ * and if a custom exec has been passed in, then it will
+ * also try to work out what extensions to monitor and
+ * whether there's a special way of running that script.
+ *
+ * @param  {Object} nodemonOptions
+ * @param  {Object} execMap
+ * @return {Object} new and updated version of nodemonOptions
+ */
+function exec(nodemonOptions, execMap) {
+  if (!execMap) {
+    execMap = {};
+  }
+
+  var options = utils.clone(nodemonOptions || {});
+  var script;
+
+  // if there's no script passed, try to get it from the first argument
+  if (!options.script && (options.args || []).length) {
+    script = expandScript(
+      options.args[0],
+      options.ext && '.' + (options.ext || 'js').split(',')[0]
+    );
+
+    // if the script was found, shift it off our args
+    if (script !== options.args[0]) {
+      options.script = script;
+      options.args.shift();
+    }
+  }
+
+  // if there's no exec found yet, then try to read it from the local
+  // package.json this logic used to sit in the cli/parse, but actually the cli
+  // should be parsed first, then the user options (via nodemon.json) then
+  // finally default down to pot shots at the directory via package.json
+  if (!options.exec && !options.script) {
+    var found = execFromPackage();
+    if (found !== null) {
+      if (found.exec) {
+        options.exec = found.exec;
+      }
+      if (!options.script) {
+        options.script = found.script;
+      }
+      if (Array.isArray(options.args) && options.scriptPosition === null) {
+        options.scriptPosition = options.args.length;
+      }
+    }
+  }
+
+  // var options = utils.clone(nodemonOptions || {});
+  script = path.basename(options.script || '');
+
+  var scriptExt = path.extname(script).slice(1);
+
+  var extension = options.ext;
+  if (extension === undefined) {
+    var isJS = scriptExt === 'js' || scriptExt === 'mjs' || scriptExt === 'cjs';
+    extension = isJS || !scriptExt ? 'js,mjs,cjs' : scriptExt;
+    extension += ',json'; // Always watch JSON files
+  }
+
+  var execDefined = !!options.exec;
+
+  // allows the user to simplify cli usage:
+  // https://github.com/remy/nodemon/issues/195
+  // but always give preference to the user defined argument
+  if (!options.exec && execMap[scriptExt] !== undefined) {
+    options.exec = execMap[scriptExt];
+    execDefined = true;
+  }
+
+  options.execArgs = nodemonOptions.execArgs || [];
+
+  if (Array.isArray(options.exec)) {
+    options.execArgs = options.exec;
+    options.exec = options.execArgs.shift();
+  }
+
+  if (options.exec === undefined) {
+    options.exec = 'node';
+  } else {
+    // allow variable substitution for {{filename}} and {{pwd}}
+    var substitution = replace.bind(null, {
+      filename: options.script,
+      pwd: process.cwd(),
+    });
+
+    var newExec = substitution(options.exec);
+    if (
+      newExec !== options.exec &&
+      options.exec.indexOf('{{filename}}') !== -1
+    ) {
+      options.script = null;
+    }
+    options.exec = newExec;
+
+    var newExecArgs = options.execArgs.map(substitution);
+    if (newExecArgs.join('') !== options.execArgs.join('')) {
+      options.execArgs = newExecArgs;
+      delete options.script;
+    }
+  }
+
+  if (options.exec === 'node' && options.nodeArgs && options.nodeArgs.length) {
+    options.execArgs = options.execArgs.concat(options.nodeArgs);
+  }
+
+  // note: indexOf('coffee') handles both .coffee and .litcoffee
+  if (
+    !execDefined &&
+    options.exec === 'node' &&
+    scriptExt.indexOf('coffee') !== -1
+  ) {
+    options.exec = 'coffee';
+
+    // we need to get execArgs set before the script
+    // for example, in `nodemon --debug my-script.coffee --my-flag`, debug is an
+    // execArg, while my-flag is a script arg
+    var leadingArgs = (options.args || []).splice(0, options.scriptPosition);
+    options.execArgs = options.execArgs.concat(leadingArgs);
+    options.scriptPosition = 0;
+
+    if (options.execArgs.length > 0) {
+      // because this is the coffee executable, we need to combine the exec args
+      // into a single argument after the nodejs flag
+      options.execArgs = ['--nodejs', options.execArgs.join(' ')];
+    }
+  }
+
+  if (options.exec === 'coffee') {
+    // don't override user specified extension tracking
+    if (options.ext === undefined) {
+      if (extension) {
+        extension += ',';
+      }
+      extension += 'coffee,litcoffee';
+    }
+
+    // because windows can't find 'coffee', it needs the real file 'coffee.cmd'
+    if (utils.isWindows) {
+      options.exec += '.cmd';
+    }
+  }
+
+  // allow users to make a mistake on the extension to monitor
+  // converts .js, pug => js,pug
+  // BIG NOTE: user can't do this: nodemon -e *.js
+  // because the terminal will automatically expand the glob against
+  // the file system :(
+  extension = (extension.match(/[^,*\s]+/g) || [])
+    .map((ext) => ext.replace(/^\./, ''))
+    .join(',');
+
+  options.ext = extension;
+
+  if (options.script) {
+    options.script = expandScript(
+      options.script,
+      extension && '.' + extension.split(',')[0]
+    );
+  }
+
+  options.env = {};
+  // make sure it's an object (and since we don't have )
+  if ({}.toString.apply(nodemonOptions.env) === '[object Object]') {
+    options.env = utils.clone(nodemonOptions.env);
+  } else if (nodemonOptions.env !== undefined) {
+    throw new Error('nodemon env values must be an object: { PORT: 8000 }');
+  }
+
+  return options;
+}