From 55eeb05157bbf776e323c4da15cc570cf189a28b Mon Sep 17 00:00:00 2001
From: Nick <nick@kousu.ca>
Date: Wed, 15 May 2024 16:44:03 -0400
Subject: [PATCH] Don't quote strings that start with 0 when running
 ansible-lint --fix.

In order to try to handle [the mess that are octals in YAML](https://github.com/ansible/ansible-lint/issues/2965),
some [special-case code was added](https://github.com/ansible/ansible-lint/pull/3030)
to handle leading-zeros. But it caught too much, and would force quotes strings
like on 00-header and 0.0.0.0, even when .yamllint doesn't require them:

```
quoted-strings:
    required: false
```

and it generates awkward lists, like

```diff
   loop:
     - "00-header"
     - 10-help-text
     - 50-landscape-sysinfo
     - 50-motd-news
     - 88-esm-announce
     - 97-overlayroot
```
---
 src/ansiblelint/yaml_utils.py               | 27 ++++++++++++++++-----
 test/fixtures/formatting-after/fmt-2.yml    |  7 ++++++
 test/fixtures/formatting-before/fmt-2.yml   |  7 ++++++
 test/fixtures/formatting-prettier/fmt-2.yml |  7 ++++++
 4 files changed, 42 insertions(+), 6 deletions(-)

diff --git a/src/ansiblelint/yaml_utils.py b/src/ansiblelint/yaml_utils.py
index 6a479211be..ca22303976 100644
--- a/src/ansiblelint/yaml_utils.py
+++ b/src/ansiblelint/yaml_utils.py
@@ -642,14 +642,29 @@ def choose_scalar_style(self) -> Any:
             and self.event.value.startswith("0")
             and len(self.event.value) > 1
         ):
-            if self.event.tag == "tag:yaml.org,2002:int" and self.event.implicit[0]:
-                if self.event.value.startswith("0x"):
-                    self.event.tag = "tag:yaml.org,2002:str"
-                    return ""
-                # ensures that "0123" string does not lose its quoting
+            # We have an as-yet unquoted token that starts with "0" (but is not itself the digit 0).
+            # It could be:
+            # - hexadecimal like "0xF1" or ; comes tagged as int. Should continue unquoted to continue as an int.
+            # - octal like "0666" or "0o755"; comes tagged as str. **Should** be quoted to be cross-YAML compatible.
+            # - string like "0.0.0.0" and "00-header". Should not be quoted, unless it has a quote in it.
+            if (
+                self.event.value.startswith("0x")
+                and self.event.tag == "tag:yaml.org,2002:int"
+                and self.event.implicit[0]
+            ):
+                # hexadecimal
+                self.event.tag = "tag:yaml.org,2002:str"
+                return ""
+            try:
+                int(self.event.value, 8)
+            except ValueError:
+                pass
+                # fallthrough to string
+            else:
+                # octal
                 self.event.tag = "tag:yaml.org,2002:str"
                 self.event.implicit = (True, True, True)
-            return '"'
+                return '"'
         if style != "'":
             # block scalar, double quoted, etc.
             return style
diff --git a/test/fixtures/formatting-after/fmt-2.yml b/test/fixtures/formatting-after/fmt-2.yml
index a162721772..3601acc225 100644
--- a/test/fixtures/formatting-after/fmt-2.yml
+++ b/test/fixtures/formatting-after/fmt-2.yml
@@ -22,3 +22,10 @@
     - 10
     - 9999
   zero: 0 # Not an octal. See #2071
+
+- string:
+    - 0steps
+    - 9steps
+    - 0.0.0.0
+    - "0"
+    - "01234"
diff --git a/test/fixtures/formatting-before/fmt-2.yml b/test/fixtures/formatting-before/fmt-2.yml
index 294166327c..dbfb777413 100644
--- a/test/fixtures/formatting-before/fmt-2.yml
+++ b/test/fixtures/formatting-before/fmt-2.yml
@@ -22,3 +22,10 @@
     - 10
     - 9999
     zero: 0  # Not an octal. See #2071
+
+  - string:
+    - 0steps
+    - 9steps
+    - 0.0.0.0
+    - "0"
+    - "01234"
diff --git a/test/fixtures/formatting-prettier/fmt-2.yml b/test/fixtures/formatting-prettier/fmt-2.yml
index 90ac484e32..037c9dd73b 100644
--- a/test/fixtures/formatting-prettier/fmt-2.yml
+++ b/test/fixtures/formatting-prettier/fmt-2.yml
@@ -22,3 +22,10 @@
     - 10
     - 9999
   zero: 0 # Not an octal. See #2071
+
+- string:
+    - 0steps
+    - 9steps
+    - 0.0.0.0
+    - "0"
+    - "01234"