add new rule check_filter_separation

README.md

@@ -18,6 +18,8 @@ The project name is an acronym for **L**ovely **A**utomation **TE**sting f**R**m
 
 ## Table of Content
 
+- [ansible-later](#ansible-later)
+  - [Table of Content](#table-of-content)
     - [Setup](#setup)
       - [Using pip](#using-pip)
       - [From source](#from-source)
@@ -131,7 +133,7 @@ Reviews are nothing without some rules or standards against which to review. ans
 comes with a couple of built-in checks explained in the following table.
 
 | Rule                            | ID          | Description                                                       | Parameter                                                            |
-| ------------------------------- | ----------- | ---------------------------------------------------------------- | -------------------------------------------------------------------- |
+|---------------------------------|-------------|-------------------------------------------------------------------|----------------------------------------------------------------------|
 | check_yaml_empty_lines          | LINT0001    | YAML should not contain unnecessarily empty lines.                | {max: 1, max-start: 0, max-end: 0}                                   |
 | check_yaml_indent               | LINT0002    | YAML should be correctly indented.                                | {spaces: 2, check-multi-line-strings: false, indent-sequences: true} |
 | check_yaml_hyphens              | LINT0003    | YAML should use consitent number of spaces after hyphens (-).     | {max-spaces-after: 1}                                                |
@@ -151,10 +153,11 @@ comes with a couple of built-in checks explained in the following table.
 | check_install_use_latest        | ANSIBLE0009 | Package managers should not install with state=latest.            |                                                                      |
 | check_shell_instead_command     | ANSIBLE0010 | Use Shell only when piping, redirecting or chaining commands.     |                                                                      |
 | check_command_has_changes       | ANSIBLE0011 | Commands should be idempotent and only used with some checks.     |                                                                      |
-| check_empty_string_compare      | ANSIBLE0012 | Don't compare to "" - use `when: var` or `when: not var`         |                                                                      |
+| check_empty_string_compare      | ANSIBLE0012 | Don't compare to "" - use `when: var` or `when: not var`.         |                                                                      |
-| check_compare_to_literal_bool   | ANSIBLE0013 | Don't compare to True/False - use `when: var` or `when: not var` |                                                                      |
+| check_compare_to_literal_bool   | ANSIBLE0013 | Don't compare to True/False - use `when: var` or `when: not var`. |                                                                      |
-| check_literal_bool_format       | ANSIBLE0014 | Literal bools should be written as `True/False` or `yes/no`      | forbidden values are `true false TRUE FALSE Yes No YES NO`           |
+| check_literal_bool_format       | ANSIBLE0014 | Literal bools should be written as `True/False` or `yes/no`.      | forbidden values are `true false TRUE FALSE Yes No YES NO`           |
-| check_become_user               | ANSIBLE0015 | `become` should be always used combined with `become_user`       |                                                                      |
+| check_become_user               | ANSIBLE0015 | `become` should be always used combined with `become_user`.       |                                                                      |
+| check_filter_separation         | ANSIBLE0016 | Jinja2 filters should be separated with spaces.                   |                                                                      |
 
 ### Build your own
 
@@ -217,7 +220,7 @@ Each file passed to `ansible-later` will be classified. The result is a `Candida
 which contains some meta informations and is an instance of one of following object types.
 
 | Object type | Description                                                                                                                  |
-| ----------- | ---------------------------------------------------------------------------------------------------------------------------- |
+|-------------|------------------------------------------------------------------------------------------------------------------------------|
 | Task        | all files within the parent dir `tasks`                                                                                      |
 | Handler     | all files within the parent dir `handler`                                                                                    |
 | RoleVars    | all files within the parent dir `vars` or `default`                                                                          |

ansiblelater/examples/standards.py

@@ -23,6 +23,7 @@ from ansiblelater.rules.ansiblefiles import check_empty_string_compare
 from ansiblelater.rules.ansiblefiles import check_compare_to_literal_bool
 from ansiblelater.rules.ansiblefiles import check_literal_bool_format
 from ansiblelater.rules.ansiblefiles import check_become_user
+from ansiblelater.rules.ansiblefiles import check_filter_separation
 
 
 tasks_should_be_separated = Standard(dict(
@@ -133,8 +134,8 @@ literal_bool_should_be_formatted = Standard(dict(
     name="Literal bools should start with a capital letter",
     check=check_literal_bool_format,
     version="0.1",
-    types=[["playbook", "task", "handler", "rolevars",
+    types=["playbook", "task", "handler", "rolevars",
-           "hostvars", "groupvars"]]
+           "hostvars", "groupvars"]
 ))
 
 use_become_with_become_user = Standard(dict(
@@ -145,6 +146,15 @@ use_become_with_become_user = Standard(dict(
     types=["playbook", "task", "handler"]
 ))
 
+use_spaces_around_filters = Standard(dict(
+    id="ANSIBLE0016",
+    name="jinja2 filters should be separated with spaces",
+    check=check_filter_separation,
+    version="0.1",
+    types=["playbook", "task", "handler", "rolevars",
+           "hostvars", "groupvars"]
+))
+
 files_should_not_contain_unnecessarily_empty_lines = Standard(dict(
     id="LINT0001",
     name="YAML should not contain unnecessarily empty lines",
@@ -236,6 +246,7 @@ standards = [
     dont_compare_to_literal_bool,
     literal_bool_should_be_formatted,
     use_become_with_become_user,
+    use_spaces_around_filters,
     # Lint
     files_should_not_contain_unnecessarily_empty_lines,
     files_should_be_indented,

ansiblelater/rules/ansiblefiles.py

@@ -231,3 +231,24 @@ def check_become_user(candidate, settings):
                 errors.append(Error(task["__line__"], description))
 
     return Result(candidate.path, errors)
+
+
+def check_filter_separation(candidate, settings):
+    yamllines, errors = get_normalized_yaml(candidate, settings)
+    description = "no suitable numbers of spaces (required: 1)"
+
+    matches = []
+    braces = re.compile("{{(.*?)}}")
+    filters = re.compile(r"(?<=\|)([\s]{2,}[^\s}]+|[^\s]+)|([^\s{]+[\s]{2,}|[^\s]+)(?=\|)")
+
+    if not errors:
+        for i, line in yamllines:
+            match = braces.findall(line)
+            if match:
+                for item in match:
+                    matches.append((i, item))
+
+        for i, line in matches:
+            if filters.findall(line):
+                errors.append(Error(i, description))
+    return Result(candidate.path, errors)