Fix quotes converting free-form syntax to yaml (ansible#4319)

YAML content has been changed to reflect that the YAML loader preserves
quotes used in YAML and to utilize the preferred_quote configuration.

.config/dictionary.txt

@@ -319,6 +319,7 @@ ruleset
 runas
 sarif
 scalarint
+scalarstring
 scancode
 schemafile
 sdist

examples/playbooks/transform-no-free-form.transformed.yml

@@ -22,9 +22,9 @@
 
     - name: Example task with usage for '=' as module params
       ansible.builtin.debug:
-        msg: "'Hello there world'"
+        msg: "Hello there world"
       changed_when: false
 
     - name: Task that has a non-debug string with spaces
       ansible.builtin.set_fact:
-        foo: '"String with spaces"'
+        foo: "String with spaces"

examples/playbooks/vars/strings.transformed.yml

@@ -2,13 +2,13 @@
 # Make sure that the Transformer does not mangle strings
 # TODO: there is a bug in ruamel.yaml that discards some EOL comments
 
-single: single # this is a comment
+single: "single" # this is a comment
 single_with_double: '"single" quoted' # this is a comment
 
 single_multiline_with_octothorpe: "single over 160 char line to force wrapping. over 160 char line to force wrapping. over 160 char line to force wrapping. over 160\n
   # this is not a comment"
 
-double: double # this is a comment
+double: "double" # this is a comment
 double_with_single: "'double' quoted" # this is a comment
 
 double_multiline_with_octothorpe: "double over 160 char line to force wrapping. over 160 char line to force wrapping. over 160 char line to force wrapping. over 160\n

src/ansiblelint/rules/no_free_form.py

@@ -7,7 +7,12 @@
 import sys
 from typing import TYPE_CHECKING, Any
 
-from ansiblelint.constants import INCLUSION_ACTION_NAMES, LINE_NUMBER_KEY
+from ruamel.yaml.scalarstring import DoubleQuotedScalarString, SingleQuotedScalarString
+
+from ansiblelint.constants import (
+    INCLUSION_ACTION_NAMES,
+    LINE_NUMBER_KEY,
+)
 from ansiblelint.rules import AnsibleLintRule, TransformMixin
 from ansiblelint.rules.key_order import task_property_sorter
 
@@ -124,7 +129,11 @@ def filter_values(
                     # Keep quoted strings together
                     quote = v[0]
                     _, v, remainder = v.split(quote, 2)
-                    v = f"{quote}{v}{quote}"
+                    v = (
+                        DoubleQuotedScalarString
+                        if quote == '"'
+                        else SingleQuotedScalarString
+                    )(v)
                 else:
                     try:
                         v, remainder = v.split(" ", 1)

src/ansiblelint/yaml_utils.py

@@ -954,6 +954,7 @@ def __init__(  # pylint: disable=too-many-arguments
         # This will only preserve quotes for strings read from the file.
         # anything modified by the transform will use no quotes, preferred_quote,
         # or the quote that results in the least amount of escaping.
+        self.preserve_quotes = True
 
         # If needed, we can use this to change null representation to be explicit
         # (see https://stackoverflow.com/a/44314840/1134951)

test/fixtures/formatting-after/fmt-1.yml

@@ -10,14 +10,14 @@ vegetables: # indented sequence:
   - carrot
 
 quoting:
-  - that should have double quotes
-  - that should remain in single quotes
-  - a string with " inside
+  - "that should have double quotes"
+  - "that should remain in single quotes"
+  - 'a string with " inside'
   # next line has some undesired trailing spaces:
-  - a string with ' inside
+  - "a string with ' inside"
   - can't be sure!
   # next line should be converted to use double quotes:
-  - [foo, bar]
+  - ["foo", "bar"]
 
 inline-dictionary:
   - { foo: bar } # should add some spacing between curly braces and content