Add win_msg module (#22008)

* new implementation of win_msg.  TODO tests

* added check_mode.  Get-AnsibleParam for parameters.  Default msg is now 'Hello world!'. Use hash for $results.
Re-ordered some parameters alphabetically.
Documentation now in raw strings.  Removed spurious required: false.  Added metadata.

* Keep pep8 checks happy

* Really keep pep8 checks happy this time

* update Changelog.md

* make bracket style internally consistent

* added units to display_seconds description

3 files changed, 162 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f57e65a2ee..15a4ac498d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -263,6 +263,7 @@ Ansible Changes By Release
   * win_dns_client
   * win_domain_membership
   * win_find
+  * win_msg
   * win_path
   * win_psexec
   * win_reg_stat
diff --git a/lib/ansible/modules/windows/win_msg.ps1 b/lib/ansible/modules/windows/win_msg.ps1
new file mode 100644
index 0000000000..4d5c2946bd
--- /dev/null
+++ b/lib/ansible/modules/windows/win_msg.ps1
@@ -0,0 +1,63 @@
+#!powershell
+# This file is part of Ansible
+#
+# Copyright 2016, Jon Hawkesworth (@jhawkesworth) <figs@unity.demon.co.uk>
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# WANT_JSON
+# POWERSHELL_COMMON
+
+$stopwatch = [system.diagnostics.stopwatch]::startNew()
+
+$params = Parse-Args $args -supports_check_mode $true
+$check_mode = Get-AnsibleParam -obj $params -name "_ansible_check_mode" -type "bool" -default $false
+
+$display_seconds = Get-AnsibleParam -obj $params -name display_seconds -default "10" -failifempty $False -resultobj $result
+$msg = Get-AnsibleParam -obj $params -name msg -default "Hello world!" -resultobj $result
+$to = Get-AnsibleParam -obj $params -name to -default "*" -failifempty $False -resultobj $result
+$wait = Get-AnsibleParam -obj $params -name wait -default $False -failifempty $False -resultobj $result
+
+$result = @{
+    changed = $false
+}
+
+
+$msg_args = @($to, "/TIME:$display_seconds")
+
+If ($wait) {
+  $msg_args += "/W"
+}
+
+$msg_args += $msg
+if (-not $check_mode) {
+  $ret = & msg.exe $msg_args 2>&1
+  $result.rc = $LASTEXITCODE
+}
+
+$endsend_at = Get-Date| Out-String
+$stopwatch.Stop()
+
+$result.changed = $True
+$result.display_seconds = $display_seconds
+$result.msg = $msg
+$result.runtime_seconds = $stopwatch.Elapsed.TotalSeconds
+$result.sent_localtime = $endsend_at.Trim()
+$result.wait = $wait
+
+If (-not $result.rc -eq 0 ) {
+    Fail-Json $result "$ret"
+}
+  
+Exit-Json $result
diff --git a/lib/ansible/modules/windows/win_msg.py b/lib/ansible/modules/windows/win_msg.py
new file mode 100644
index 0000000000..627e9df58c
--- /dev/null
+++ b/lib/ansible/modules/windows/win_msg.py
@@ -0,0 +1,98 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# (c) 2017, Jon Hawkesworth (@jhawkesworth) <figs@unity.demon.co.uk>
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# this is a windows documentation stub.  actual code lives in the .ps1
+# file of the same name
+
+ANSIBLE_METADATA = {'status': ['preview'],
+                    'supported_by': 'community',
+                    'version': '1.0'}
+
+DOCUMENTATION = r'''
+---
+module: win_msg
+version_added: "2.3"
+short_description: Sends a message to logged in users on Windows hosts.
+description:
+    - Wraps the msg.exe command in order to send messages to Windows hosts.
+options:
+  to:
+    description:
+      - Who to send the message to. Can be a username, sessionname or sessionid.
+    default: '*'
+  display_seconds:
+    description:
+      - How long to wait for receiver to acknowledge message, in seconds.
+    default: 10
+  wait:
+    description:
+      - Whether to wait for users to respond.  Module will only wait for the number of seconds specified in display_seconds or 10 seconds if not specified.
+        However, if I(wait) is true, the message is sent to each logged on user in turn, waiting for the user to either press 'ok' or for
+        the timeout to elapse before moving on to the next user.
+    required: false
+    default: false
+  msg:
+    description:
+      - The text of the message to be displayed.
+    default: Hello world!
+author: "Jon Hawkesworth (@jhawkesworth)"
+notes:
+   - This module must run on a windows host, so ensure your play targets windows
+     hosts, or delegates to a windows host.
+   - Messages are only sent to the local host where the module is run.
+   - The module does not support sending to users listed in a file.
+   - Setting wait to true can result in long run times on systems with many logged in users.
+'''
+
+EXAMPLES = r'''
+  # Warn logged in users of impending upgrade
+  win_msg:
+    display_seconds: 60
+    msg: "Automated upgrade about to start.  Please save your work and log off before {{ deployment_start_time  }}"
+'''
+
+RETURN = r'''
+msg:
+    description: Test of the message that was sent.
+    returned: changed
+    type: string
+    sample: "Automated upgrade about to start.  Please save your work and log off before 22 July 2016 18:00:00"
+display_seconds:
+    description: Value of display_seconds module parameter.
+    returned: success
+    type: string
+    sample: 10
+runtime_seconds:
+    description: How long the module took to run on the remote windows host.
+    returned: success
+    type: string
+    sample: 22 July 2016 17:45:51
+sent_localtime:
+    description: local time from windows host when the message was sent.
+    returned: success
+    type: string
+    sample: 22 July 2016 17:45:51
+wait:
+    description: Value of wait module parameter.
+    returned: success
+    type: boolean
+    sample: false
+'''
+