npm: fix idempotence (#22238)

* npm: fix idempotence

* Better idempotency fix

More intelligently add --production rather than depending on hard coded order in args list
Cleanup boilderplate imports and license
PEP8 fixes

lib/ansible/modules/packaging/language/npm.py

@@ -1,16 +1,17 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
-
-# (c) 2013, Chris Hoffman <christopher.hoffman@gmail.com>
+# Copyright (c) 2017 Chris Hoffman <christopher.hoffman@gmail.com>
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
 from __future__ import absolute_import, division, print_function
 __metaclass__ = type
 
 
-ANSIBLE_METADATA = {'metadata_version': '1.1',
+ANSIBLE_METADATA = {
+    'metadata_version': '1.1',
     'status': ['preview'],
-                    'supported_by': 'community'}
+    'supported_by': 'community'
+}
 
 
 DOCUMENTATION = '''
@@ -115,12 +116,20 @@ EXAMPLES = '''
     state: present
 '''
 
-import json
 import os
 import re
 
 from ansible.module_utils.basic import AnsibleModule
 
+try:
+    import json
+except ImportError:
+    try:
+        import simplejson as json
+    except ImportError:
+        # Let snippet from module_utils/basic.py return a proper error in this case
+        pass
+
 
 class Npm(object):
     def __init__(self, module, **kwargs):
@@ -132,13 +141,14 @@ class Npm(object):
         self.registry = kwargs['registry']
         self.production = kwargs['production']
         self.ignore_scripts = kwargs['ignore_scripts']
+        self.state = kwargs['state']
 
         if kwargs['executable']:
             self.executable = kwargs['executable'].split(' ')
         else:
             self.executable = [module.get_bin_path('npm', True)]
 
-        if kwargs['version']:
+        if kwargs['version'] and self.state != 'absent':
             self.name_version = self.name + '@' + str(self.version)
         else:
             self.name_version = self.name
@@ -149,7 +159,7 @@ class Npm(object):
 
             if self.glbl:
                 cmd.append('--global')
-            if self.production:
+            if self.production and ('install' in cmd or 'update' in cmd):
                 cmd.append('--production')
             if self.ignore_scripts:
                 cmd.append('--ignore-scripts')
@@ -248,8 +258,8 @@ def main():
     if state == 'absent' and not name:
         module.fail_json(msg='uninstalling a package is only available for named packages')
 
-    npm = Npm(module, name=name, path=path, version=version, glbl=glbl, production=production, \
-              executable=executable, registry=registry, ignore_scripts=ignore_scripts)
+    npm = Npm(module, name=name, path=path, version=version, glbl=glbl, production=production,
+              executable=executable, registry=registry, ignore_scripts=ignore_scripts, state=state)
 
     changed = False
     if state == 'present':

test/sanity/pep8/legacy-files.txt

@@ -368,7 +368,6 @@ lib/ansible/modules/packaging/language/cpanm.py
 lib/ansible/modules/packaging/language/easy_install.py
 lib/ansible/modules/packaging/language/gem.py
 lib/ansible/modules/packaging/language/maven_artifact.py
-lib/ansible/modules/packaging/language/npm.py
 lib/ansible/modules/packaging/language/pear.py
 lib/ansible/modules/packaging/language/pip.py
 lib/ansible/modules/packaging/os/apk.py