Add option to allow coercion of array items

README.md

@@ -60,6 +60,8 @@ Parses command line arguments returning a simple mapping of keys and values.
 * `opts`: provide a set of hints indicating how `args` should be parsed:
   * `opts.alias`: an object representing the set of aliases for a key: `{alias: {foo: ['f']}}`.
   * `opts.array`: indicate that keys should be parsed as an array: `{array: ['foo', 'bar']}`.
+     Indicate that keys should be parsed as an array and coerced to booleans / numbers:
+     `{array: [{ key: 'foo', boolean: true }, {key: 'bar', number: true}]}`.
   * `opts.boolean`: arguments should be parsed as booleans: `{boolean: ['x', 'y']}`.
   * `opts.config`: indicate a key that represents a path to a configuration file (this file will be loaded and parsed).
   * `opts.coerce`: provide a custom synchronous function that returns a coerced value from the argument provided

index.js

@@ -52,7 +52,23 @@ function parse (args, opts) {
   var negative = /^-[0-9]+(\.[0-9]+)?/
   var negatedBoolean = new RegExp('^--' + configuration['negation-prefix'] + '(.+)')
 
-  ;[].concat(opts.array).filter(Boolean).forEach(function (key) {
+  ;[].concat(opts.array).filter(Boolean).forEach(function (opt) {
+    var key = opt.key || opt
+
+    // assign to flags[bools|strings|numbers]
+    const assignment = Object.keys(opt).map(function (key) {
+      return ({
+        boolean: 'bools',
+        string: 'strings',
+        number: 'numbers'
+      })[key]
+    }).filter(Boolean).pop()
+
+    // assign key to be coerced
+    if (assignment) {
+      flags[assignment][key] = true
+    }
+
     flags.arrays[key] = true
     flags.keys.push(key)
   })

test/yargs-parser.js

@@ -1567,6 +1567,63 @@ describe('yargs-parser', function () {
       Array.isArray(result['someOption']).should.equal(true)
       result['someOption'].should.deep.equal([1, 2])
     })
+
+    // see https://github.com/yargs/yargs-parser/issues/6
+    it('should respect the type `boolean` option for arrays', function () {
+      var result = parser(['-x=true', 'false'], {
+        array: [{ key: 'x', boolean: true }]
+      })
+      result.should.have.property('x').that.is.an('array').and.to.deep.equal([true, false])
+    })
+
+    it('should respect the type `number` option for arrays', function () {
+      var result = parser(['-x=5', '2'], {
+        array: [{ key: 'x', number: true }]
+      })
+      result.should.have.property('x').that.is.an('array').and.to.deep.equal([5, 2])
+    })
+
+    it('should respect the type `string` option for arrays', function () {
+      var result = parser(['-x=5', '2'], {
+        configuration: {
+          'parse-numbers': true
+        },
+        array: [{ key: 'x', string: true }]
+      })
+      result.should.have.property('x').that.is.an('array').and.to.deep.equal(['5', '2'])
+    })
+
+    it('should eat non-hyphenated arguments until hyphenated option is hit - combined with coercion', function () {
+      var result = parser([
+        '-a=hello', 'world',
+        '-b', '33', '22',
+        '--foo', 'true', 'false',
+        '--bar=cat', 'dog'
+      ], {
+        array: [
+          'a',
+          { key: 'b', integer: true },
+          { key: 'foo', boolean: true },
+          'bar'
+        ]
+      })
+
+      Array.isArray(result.a).should.equal(true)
+      result.a.should.include('hello')
+      result.a.should.include('world')
+
+      Array.isArray(result.b).should.equal(true)
+      result.b.should.include(33)
+      result.b.should.include(22)
+
+      Array.isArray(result.foo).should.equal(true)
+      result.foo.should.include(true)
+      result.foo.should.include(false)
+
+      Array.isArray(result.bar).should.equal(true)
+      result.bar.should.include('cat')
+      result.bar.should.include('dog')
+    })
   })
 
   describe('nargs', function () {