Start --watch integration

CHANGELOG.md

@@ -1,3 +1,16 @@
+## 4.0.0
+
+**Revitalized documentation.js command line interface!**
+
+The `documentation` utility now takes commands:
+
+* `documentation build` extracts and formats documentation
+* `documentation serve` provides an auto-reloading server
+* `documentation lint` reviews files for inconsistencies
+
+This functionality was previously included in `dev-documentation` and has
+been folded into `documentation` proper.
+
 ## 3.0.4
 
 * Allow parameter types to be mixed into explicit parameter documentation. (#239 and #232)

bin/documentation.js

@@ -5,41 +5,80 @@
 'use strict';
 
 var documentation = require('../'),
+  chokidar = require('chokidar'),
+  debounce = require('debounce'),
   streamArray = require('stream-array'),
   fs = require('fs'),
   vfs = require('vinyl-fs'),
-  lint = require('../lib/lint'),
-  args = require('../lib/args.js');
+  errorPage = require('../lib/error_page'),
+  Server = require('../lib/server'),
+  args = require('../lib/args');
 
-var parsedArgs = args(process.argv.slice(2)),
-  formatterOptions = parsedArgs.formatterOptions,
-  outputLocation = parsedArgs.output,
-  formatter = documentation.formats[parsedArgs.formatter];
+var parsedArgs = args(process.argv.slice(2));
 
-documentation(parsedArgs.inputs, parsedArgs.options, function (err, comments) {
+var generator = documentation.bind(null,
+  parsedArgs.inputs, parsedArgs.options, onDocumented.bind(null, parsedArgs));
+
+var server = new Server();
+server.on('listening', function () {
+  process.stdout.write('documentation.js serving on port 4001\n');
+});
+
+function onDocumented(parsedArgs, err, comments) {
   if (err) {
+    if (parsedArgs.command === 'serve') {
+      return server.setFiles([errorPage(err)]).start();
+    }
     throw err;
   }
 
-  if (parsedArgs.options.lint) {
-    var lintOutput = lint.format(comments);
+  documentation.formats[parsedArgs.formatter](
+    comments, parsedArgs.formatterOptions,
+    onFormatted.bind(null, parsedArgs));
+}
+
+function onFormatted(parsedArgs, err, output) {
+  if (parsedArgs.watch) {
+    updateWatcher();
+  }
+
+  if (parsedArgs.command === 'serve') {
+    server.setFiles(output).start();
+  } else if (parsedArgs.output === 'stdout') {
+    process.stdout.write(output);
+  } else if (Array.isArray(output)) {
+    streamArray(output).pipe(vfs.dest(parsedArgs.output));
+  } else {
+    fs.writeFileSync(parsedArgs.output, output);
+  }
+}
+
+if (parsedArgs.command === 'lint') {
+  documentation.lint(parsedArgs.inputs, parsedArgs.options, function (err, lintOutput) {
+    if (err) {
+      throw err;
+    }
     if (lintOutput) {
       console.log(lintOutput);
       process.exit(1);
     } else {
       process.exit(0);
     }
+  });
+} else {
+  generator();
+  if (parsedArgs.watch) {
+    var watcher = chokidar.watch(parsedArgs.inputs);
+    watcher.on('all', debounce(generator, 300));
   }
+}
 
-  formatter(comments, formatterOptions, function (err, output) {
-    if (outputLocation !== 'stdout') {
-      if (parsedArgs.formatter === 'html') {
-        streamArray(output).pipe(vfs.dest(outputLocation));
-      } else {
-        fs.writeFileSync(outputLocation, output);
-      }
-    } else {
-      process.stdout.write(output);
-    }
-  });
-});
+function updateWatcher() {
+  documentation.expandInputs(parsedArgs.inputs, parsedArgs.options, addNewFiles);
+}
+
+function addNewFiles(err, files) {
+  watcher.add(files.map(function (data) {
+    return data.file;
+  }));
+}

index.js

@@ -16,7 +16,8 @@ var sort = require('./lib/sort'),
   inferProperties = require('./lib/infer/properties'),
   inferMembership = require('./lib/infer/membership'),
   inferReturn = require('./lib/infer/return'),
-  lint = require('./lib/lint');
+  formatLint = require('./lib/lint').formatLint,
+  lintComments = require('./lib/lint').lintComments;
 
 /**
  * Build a pipeline of comment handlers.
@@ -45,6 +46,20 @@ function noop(comment) {
   return comment;
 }
 
+/**
+ * Given an array of indexes and options for whether to resolve shallow
+ * or deep dependencies, resolve dependencies.
+ *
+ * @param {Array<string>|string} indexes files to process
+ * @param {Object} options options
+ * @param {Function} callback called with results
+ * @returns {undefined}
+ */
+function expandInputs(indexes, options, callback) {
+  var inputFn = (options.polyglot || options.shallow) ? shallow : dependency;
+  inputFn(indexes, options, callback);
+}
+
 /**
  * Generate JavaScript documentation as a list of parsed JSDoc
  * comments, given a root file as a path.
@@ -75,25 +90,23 @@ module.exports = function (indexes, options, callback) {
     indexes = [indexes];
   }
 
-  var inputFn = (options.polyglot || options.shallow) ? shallow : dependency;
   var parseFn = (options.polyglot) ? polyglot : parseJavaScript;
 
-  return inputFn(indexes, options, function (error, inputs) {
+  return expandInputs(indexes, options, function (error, inputs) {
     if (error) {
       return callback(error);
     }
     try {
       callback(null,
         filterAccess(
-          (options.private || options.lint) ? [] : undefined,
+          options.private ? [] : undefined,
           hierarchy(
             inputs
               .filter(filterJS)
               .reduce(function (memo, file) {
                 return memo.concat(parseFn(file));
               }, [])
               .map(pipeline(
-                lint.lint,
                 inferName(),
                 inferKind(),
                 inferParams(),
@@ -111,6 +124,62 @@ module.exports = function (indexes, options, callback) {
   });
 };
 
+/**
+ * Lint files for non-standard or incorrect documentation
+ * information, returning a potentially-empty string
+ * of lint information intended for human-readable output.
+ *
+ * @param {Array<string>|string} indexes files to process
+ * @param {Object} options options
+ * @param {Array<string>} options.external a string regex / glob match pattern
+ * that defines what external modules will be whitelisted and included in the
+ * generated documentation.
+ * @param {Array<string>} options.transform source transforms given as strings
+ * passed to [the module-deps transform option](https://github.com/substack/module-deps)
+ * @param {boolean} [options.polyglot=false] parse comments with a regex rather than
+ * a proper parser. This enables support of non-JavaScript languages but
+ * reduces documentation's ability to infer structure of code.
+ * @param {boolean} [options.shallow=false] whether to avoid dependency parsing
+ * even in JavaScript code. With the polyglot option set, this has no effect.
+ * @param {Function} callback to be called when the documentation generation
+ * is complete, with (err, result) argumentsj
+ * @returns {undefined} calls callback
+ */
+module.exports.lint = function lint(indexes, options, callback) {
+  options = options || {};
+
+  if (typeof indexes === 'string') {
+    indexes = [indexes];
+  }
+
+  var parseFn = (options.polyglot) ? polyglot : parseJavaScript;
+
+  return expandInputs(indexes, options, function (error, inputs) {
+    if (error) {
+      return callback(error);
+    }
+    callback(null,
+      formatLint(hierarchy(
+        inputs
+          .filter(filterJS)
+          .reduce(function (memo, file) {
+            return memo.concat(parseFn(file));
+          }, [])
+          .map(pipeline(
+            lintComments,
+            inferName(),
+            inferKind(),
+            inferParams(),
+            inferProperties(),
+            inferReturn(),
+            inferMembership(),
+            nest))
+          .filter(Boolean))));
+  });
+};
+
+module.exports.expandInputs = expandInputs;
+
 module.exports.formats = {
   html: require('./lib/output/html'),
   md: require('./lib/output/markdown'),