auto helper mode added

README.md

@@ -10,7 +10,7 @@ Ansible module to use some AUR helpers. The following helpers are supported:
 |---      |---      |---     |---                               |---|
 |name     |no       |        |                                  |Name or list of names of the package(s) to install or upgrade.|
 |upgrade  |no       |no      |yes, no                           |Whether or not to upgrade whole system.|
-|helper   |no       |pacaur  |pacaur, trizen, yaourt, yay |Helper to use.|
+|use      |no       |auto    |auto, pacaur, trizen, yaourt, yay |The helper to use, 'auto' uses the first helper found in the list.|
 
 ### Note
 Either *name* or *upgrade* is required, both can not be used together.
@@ -43,7 +43,7 @@ Use it in a task, as in the following examples:
 
   # Install (using trizen)
   - aur:
-      helper: trizen
+      use: trizen
       name:
         - package_name_1
         - package_name_2 

aur.py

@@ -4,32 +4,32 @@ from ansible.module_utils.basic import *
 
 
 helper_cmd = {
-    'pacaur': ['env', 'LC_ALL=C', 'pacaur', '-S', '--noconfirm', '--noedit', '--needed', '--aur'],
     'trizen': ['env', 'LC_ALL=C', 'trizen', '-S', '--noconfirm', '--noedit', '--needed', '--aur'],
+    'pacaur': ['env', 'LC_ALL=C', 'pacaur', '-S', '--noconfirm', '--noedit', '--needed', '--aur'],
     'yaourt': ['env', 'LC_ALL=C', 'yaourt', '-S', '--noconfirm', '--needed'],
     'yay': ['env', 'LC_ALL=C', 'yay', '-S', '--noconfirm'],
 }
 
 
-def upgrade(module, helper):
+def upgrade(module, use):
-    assert helper in helper_cmd
+    assert use in helper_cmd
 
-    cmd = helper_cmd[helper] + ['-u']
+    cmd = helper_cmd[use] + ['-u']
 
     rc, out, err = module.run_command(cmd, check_rc=True)
 
     module.exit_json(
-        changed=not (out == '' or 'there is nothing to do' in out or 'No AUR update found' in out),
+        changed=not (out == '' or 'there is nothing to do' in out or 'No AUR updates found' in out),
         msg='upgraded system',
     )
 
 
-def install_packages(module, packages, helper):
+def install_packages(module, packages, use):
-    assert helper in helper_cmd
+    assert use in helper_cmd
 
     changed_iter = False
     for package in packages:
-        cmd = helper_cmd[helper] + [package]
+        cmd = helper_cmd[use] + [package]
 
         rc, out, err = module.run_command(cmd, check_rc=True)
         changed_iter = changed_iter or not (out == '' or '-- skipping' in out)
@@ -50,9 +50,9 @@ def main():
                 'default': False,
                 'type': 'bool',
             },
-            'helper': {
+            'use': {
-                'default': 'pacaur',
+                'default': 'auto',
-                'choices': ['pacaur', 'trizen', 'yaourt', 'yay'],
+                'choices': ['auto', 'pacaur', 'trizen', 'yaourt', 'yay'],
             },
         },
         required_one_of=[['name', 'upgrade']],
@@ -60,12 +60,20 @@ def main():
 
     params = module.params
 
+    if params['use'] == 'auto':
+        for k in helper_cmd:
+            if module.get_bin_path(k, False):
+                helper = k
+                break
+    else:
+        helper = params['use']
+
     if params['upgrade'] and params['name']:
         module.fail_json(msg="Upgrade and install must be requested separately")
     if params['upgrade']:
-        upgrade(module, params['helper'])
+        upgrade(module, helper)
     else:
-        install_packages(module, params['name'], params['helper'])
+        install_packages(module, params['name'], helper)
 
 
 if __name__ == '__main__':