lineinfile: pylint fixes and docs (#30854)

This PR includes;
- pylint fixes
- Documentation updates

lib/ansible/modules/files/lineinfile.py

@@ -18,15 +18,15 @@ DOCUMENTATION = """
 ---
 module: lineinfile
 author:
-    - "Daniel Hokka Zakrissoni (@dhozac)"
-    - "Ahti Kitsik (@ahtik)"
+    - Daniel Hokka Zakrissoni (@dhozac)
+    - Ahti Kitsik (@ahtik)
 extends_documentation_fragment:
     - files
     - validate
-short_description: Ensure a particular line is in a file, or replace an
-                   existing line using a back-referenced regular expression.
+short_description: Manage lines in text files
 description:
-  - This module will search a file for a line, and ensure that it is present or absent.
+  - This module ensures a particular line is in a file, or replace an
+    existing line using a back-referenced regular expression.
   - This is primarily useful when you want to change a single line in
     a file only. See the M(replace) module if you want to change
     multiple, similar lines or check M(blockinfile) if you want to insert/update/remove a block of lines in a file.
@@ -34,38 +34,30 @@ description:
 version_added: "0.7"
 options:
   path:
-    required: true
-    aliases: [ 'dest', 'destfile', 'name' ]
     description:
       - The file to modify.
       - Before 2.3 this option was only usable as I(dest), I(destfile) and I(name).
+    aliases: [ dest, destfile, name ]
+    required: true
   regexp:
-    required: false
-    version_added: 1.7
     description:
       - The regular expression to look for in every line of the file. For
         C(state=present), the pattern to replace if found; only the last line
         found will be replaced. For C(state=absent), the pattern of the line(s)
         to remove.  Uses Python regular expressions; see
         U(http://docs.python.org/2/library/re.html).
+    version_added: '1.7'
   state:
-    required: false
-    choices: [ present, absent ]
-    default: "present"
-    aliases: []
     description:
       - Whether the line should be there or not.
+    choices: [ absent, present ]
+    default: present
   line:
-    required: false
     description:
       - Required for C(state=present). The line to insert/replace into the
         file. If C(backrefs) is set, may contain backreferences that will get
         expanded with the C(regexp) capture groups if the regexp matches.
   backrefs:
-    required: false
-    default: "no"
-    choices: [ "yes", "no" ]
-    version_added: "1.1"
     description:
       - Used with C(state=present). If set, line can contain backreferences
         (both positional and named) that will get populated if the C(regexp)
@@ -74,45 +66,43 @@ options:
         doesn't match anywhere in the file, the file will be left unchanged.
         If the C(regexp) does match, the last matching line will be replaced by
         the expanded line parameter.
+    type: bool
+    default: 'no'
+    version_added: "1.1"
   insertafter:
-    required: false
-    default: EOF
     description:
       - Used with C(state=present). If specified, the line will be inserted
         after the last match of specified regular expression. A special value is
         available; C(EOF) for inserting the line at the end of the file.
         If specified regular expression has no matches, EOF will be used instead.
         May not be used with C(backrefs).
-    choices: [ 'EOF', '*regex*' ]
+    choices: [ EOF, '*regex*' ]
+    default: EOF
   insertbefore:
-    required: false
-    version_added: "1.1"
     description:
       - Used with C(state=present). If specified, the line will be inserted
         before the last match of specified regular expression. A value is
         available; C(BOF) for inserting the line at the beginning of the file.
         If specified regular expression has no matches, the line will be
         inserted at the end of the file.  May not be used with C(backrefs).
-    choices: [ 'BOF', '*regex*' ]
+    choices: [ BOF, '*regex*' ]
+    version_added: "1.1"
   create:
-    required: false
-    choices: [ "yes", "no" ]
-    default: "no"
     description:
       - Used with C(state=present). If specified, the file will be created
         if it does not already exist. By default it will fail if the file
         is missing.
+    type: bool
+    default: 'no'
   backup:
-     required: false
-     default: "no"
-     choices: [ "yes", "no" ]
      description:
        - Create a backup file including the timestamp information so you can
          get the original file back if you somehow clobbered it incorrectly.
+     type: bool
+     default: 'no'
   others:
      description:
        - All arguments accepted by the M(file) module also work here.
-     required: false
 notes:
   - As of Ansible 2.3, the I(dest) option has been changed to I(path) as default, but I(dest) still works as well.
 """
@@ -177,8 +167,8 @@ EXAMPLES = r"""
     validate: '/usr/sbin/visudo -cf %s'
 """
 
-import re
 import os
+import re
 import tempfile
 
 # import module snippets
@@ -311,7 +301,7 @@ def present(module, dest, regexp, line, insertafter, insertbefore, create,
     elif insertafter == 'EOF' or index[1] == -1:
 
         # If the file is not empty then ensure there's a newline before the added line
-        if len(b_lines) > 0 and not b_lines[-1][-1:] in (b('\n'), b('\r')):
+        if b_lines and not b_lines[-1][-1:] in (b('\n'), b('\r')):
             b_lines.append(b_linesep)
 
         b_lines.append(b_line + b_linesep)
@@ -408,20 +398,20 @@ def absent(module, dest, regexp, line, backup):
 def main():
     module = AnsibleModule(
         argument_spec=dict(
-            path=dict(required=True, aliases=['dest', 'destfile', 'name'], type='path'),
-            state=dict(default='present', choices=['absent', 'present']),
-            regexp=dict(default=None),
-            line=dict(aliases=['value']),
-            insertafter=dict(default=None),
-            insertbefore=dict(default=None),
-            backrefs=dict(default=False, type='bool'),
-            create=dict(default=False, type='bool'),
-            backup=dict(default=False, type='bool'),
-            validate=dict(default=None, type='str'),
+            path=dict(type='path', required=True, aliases=['dest', 'destfile', 'name']),
+            state=dict(type='str', default='present', choices=['absent', 'present']),
+            regexp=dict(type='str'),
+            line=dict(type='str', aliases=['value']),
+            insertafter=dict(type='str'),
+            insertbefore=dict(type='str'),
+            backrefs=dict(type='bool', default=False),
+            create=dict(type='bool', default=False),
+            backup=dict(type='bool', default=False),
+            validate=dict(type='str'),
         ),
         mutually_exclusive=[['insertbefore', 'insertafter']],
         add_file_common_args=True,
-        supports_check_mode=True
+        supports_check_mode=True,
     )
 
     params = module.params