Use opkg module as basis for macports module

This module is pretty simplistic, it is derived from the opkg module.

library/macports

+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# (c) 2013, Jimmy Tang <jcftang@gmail.com>
+# Based on okpg (Patrick Pelletier <pp.pelletier@gmail.com>), pacman
+# (Afterburn) and pkgin (Shaun Zinck) modules
+#
+# This module 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.
+#
+# This software 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 this software.  If not, see <http://www.gnu.org/licenses/>.
+
+DOCUMENTATION = '''
+---
+module: macports
+author: Jimmy Tang
+short_description: Package manager for MacPorts
+description:
+    - Manages MacPorts packages
+version_added: "1.1"
+options:
+    name:
+        description:
+            - name of package to install/remove
+        required: true
+    state:
+        description:
+            - state of the package
+        choices: [ 'present', 'absent' ]
+        required: false
+        default: present
+    update_cache:
+        description:
+            - update the package db first
+        required: false
+notes:  []
+'''
+EXAMPLES = '''
+macports: name=foo state=present
+macports: name=foo state=present update_cache=yes
+macports: name=foo state=absent
+macports: name=foo,bar state=absent
+'''
+
+
+def update_package_db(module, port_path):
+    """ Updates packages list. """
+
+    rc, out, err = module.run_command("%s sync" % port_path)
+
+    if rc != 0:
+        module.fail_json(msg="could not update package db")
+
+
+def query_package(module, port_path, name, state="present"):
+    """ Returns whether a package is installed or not. """
+
+    if state == "present":
+
+        rc, out, err = module.run_command("%s installed | grep -q ^.*%s" % (port_path, name))
+        if rc == 0:
+            return True
+
+        return False
+
+
+def remove_packages(module, port_path, packages):
+    """ Uninstalls one or more packages if installed. """
+
+    remove_c = 0
+    # Using a for loop incase of error, we can report the package that failed
+    for package in packages:
+        # Query the package first, to see if we even need to remove
+        if not query_package(module, port_path, package):
+            continue
+
+        rc, out, err = module.run_command("%s uninstall %s" % (port_path, package))
+
+        if query_package(module, port_path, package):
+            module.fail_json(msg="failed to remove %s: %s" % (package, out))
+
+        remove_c += 1
+
+    if remove_c > 0:
+
+        module.exit_json(changed=True, msg="removed %s package(s)" % remove_c)
+
+    module.exit_json(changed=False, msg="package(s) already absent")
+
+
+def install_packages(module, port_path, packages):
+    """ Installs one or more packages if not already installed. """
+
+    install_c = 0
+
+    for package in packages:
+        if query_package(module, port_path, package):
+            continue
+
+        rc, out, err = module.run_command("%s install %s" % (port_path, package))
+
+        if not query_package(module, port_path, package):
+            module.fail_json(msg="failed to install %s: %s" % (package, out))
+
+        install_c += 1
+
+    if install_c > 0:
+        module.exit_json(changed=True, msg="installed %s package(s)" % (install_c))
+
+    module.exit_json(changed=False, msg="package(s) already present")
+
+
+def main():
+    module = AnsibleModule(
+        argument_spec = dict(
+            name = dict(aliases=["pkg"], required=True),
+            state = dict(default="present", choices=["present", "installed", "absent", "removed"]),
+            update_cache = dict(default="no", aliases=["update-cache"], type='bool')
+        )
+    )
+
+    port_path = module.get_bin_path('port', True, ['/opt/local/bin'])
+
+    p = module.params
+
+    if p["update_cache"]:
+        update_package_db(module, port_path)
+
+    pkgs = p["name"].split(",")
+
+    if p["state"] in ["present", "installed"]:
+        install_packages(module, port_path, pkgs)
+
+    elif p["state"] in ["absent", "removed"]:
+        remove_packages(module, port_path, pkgs)
+
+# this is magic, see lib/ansible/module_common.py
+#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
+
+main()