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may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# JinjaTurtle
JinjaTurtle is a command-line tool to help you generate Jinja2 templates and
Ansible `defaults/main.yml` files from a native configuration file of a piece
of software.
## How it works
* The config file is examined
* Parameter key names are generated based on the parameter names in the
config file. In keeping with Ansible best practices, you pass a prefix
for the key names, which should typically match the name of your Ansible
role.
* A Jinja2 file is generated from the file with those parameter key names
injected as the `{{ variable }}` names.
* A `defaults/main.yml` is generated with those key names and the *values*
taken from the original config file as the defaults.
By default, the Jinja2 template and the `defaults/main.yml` are printed to
stdout. However, it is possible to output the results to new files.
## How to install it
### From PyPi
```
pip install jinjaturtle
```
### From this git repository
Clone the repo and then run inside the clone:
```
poetry install
```
### AppImage
Download the AppImage from the Releases and make it executable, and put it
on your `$PATH`.
## How to run it
Say you have a `php.ini` file and you are in a directory structure like an
Ansible role (with subfolders `defaults` and `templates`):
```shell
jinjaturtle php.ini \
--role-name php \
--defaults-output defaults/main.yml \
--template-output templates/php.ini.j2
```
## Full usage info
```
usage: jinjaturtle [-h] -r ROLE_NAME [-f {ini,toml}] [-d DEFAULTS_OUTPUT] [-t TEMPLATE_OUTPUT] config
Convert a config file into an Ansible defaults file and Jinja2 template.
positional arguments:
config Path to the source configuration file (TOML or INI-style).
options:
-h, --help show this help message and exit
-r, --role-name ROLE_NAME
Ansible role name, used as variable prefix (e.g. cometbft).
-f, --format {ini,toml}
Force config format instead of auto-detecting from filename.
-d, --defaults-output DEFAULTS_OUTPUT
Path to write defaults/main.yml. If omitted, defaults YAML is printed to stdout.
-t, --template-output TEMPLATE_OUTPUT
Path to write the Jinja2 config template. If omitted, template is printed to stdout.
```

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[tool.poetry]
name = "jinjaturtle"
version = "0.1.0"
description = "Convert config files into Ansible defaults and Jinja2 templates."
authors = ["Miguel Jacq <mig@mig5.net>"]
license = "GPL-3.0-or-later"
readme = "README.md"
packages = [{ include = "jinjaturtle", from = "src" }]
keywords = ["ansible", "jinja2", "config", "toml", "ini", "devops"]
homepage = "https://git.mig5.net/mig5/jinjaturtle"
repository = "https://git.mig5.net/mig5/jinjaturtle"
[tool.poetry.dependencies]
python = "^3.10"
PyYAML = "^6.0"
tomli = { version = "^2.0.0", python = "<3.11" }
[tool.poetry.group.dev.dependencies]
pytest = "^7.0"
pytest-cov = "^4.0"
build = "^1.0"
twine = "^5.0"
pyproject-appimage = "^4.2"
[tool.poetry.scripts]
jinjaturtle = "jinjaturtle.cli:main"
[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"
[tool.pyproject-appimage]
script = "jinjaturtle"
output = "JinjaTurtle.AppImage"

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#!/bin/bash
set -eo pipefail
rm -rf dist
# Publish to Pypi
poetry build
poetry publish
# Make AppImage
poetry run pyproject-appimage
mv JinjaTurtle.AppImage dist/
# Sign packages
for file in `ls -1 dist/`; do qubes-gpg-client --batch --armor --detach-sign dist/$file > dist/$file.asc; done

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from __future__ import annotations
__all__ = ["__version__"]
__version__ = "0.1.0"

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from __future__ import annotations
import argparse
import sys
from pathlib import Path
from .core import (
parse_config,
flatten_config,
generate_defaults_yaml,
generate_template,
)
def _build_arg_parser() -> argparse.ArgumentParser:
ap = argparse.ArgumentParser(
prog="jinjaturtle",
description="Convert a config file into an Ansible defaults file and Jinja2 template.",
)
ap.add_argument(
"config",
help="Path to the source configuration file (TOML or INI-style).",
)
ap.add_argument(
"-r",
"--role-name",
required=True,
help="Ansible role name, used as variable prefix (e.g. cometbft).",
)
ap.add_argument(
"-f",
"--format",
choices=["ini", "toml"],
help="Force config format instead of auto-detecting from filename.",
)
ap.add_argument(
"-d",
"--defaults-output",
help="Path to write defaults/main.yml. If omitted, defaults YAML is printed to stdout.",
)
ap.add_argument(
"-t",
"--template-output",
help="Path to write the Jinja2 config template. If omitted, template is printed to stdout.",
)
return ap
def _main(argv: list[str] | None = None) -> int:
parser = _build_arg_parser()
args = parser.parse_args(argv)
config_path = Path(args.config)
fmt, parsed = parse_config(config_path, args.format)
flat_items = flatten_config(fmt, parsed)
defaults_yaml = generate_defaults_yaml(args.role_name, flat_items)
template_str = generate_template(fmt, parsed, args.role_name)
if args.defaults_output:
Path(args.defaults_output).write_text(defaults_yaml, encoding="utf-8")
else:
print("# defaults/main.yml")
print(defaults_yaml, end="")
if args.template_output:
Path(args.template_output).write_text(template_str, encoding="utf-8")
else:
print("# config.j2")
print(template_str, end="")
return 0
def main() -> None:
"""
Console-script entry point.
Defined in pyproject.toml as:
jinjaturtle = jinjaturtle.cli:main
"""
raise SystemExit(_main(sys.argv[1:]))

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from __future__ import annotations
import configparser
from pathlib import Path
from typing import Any, Iterable
import yaml
try:
import tomllib # Python 3.11+
except ModuleNotFoundError: # pragma: no cover
try:
import tomli as tomllib # type: ignore
except ModuleNotFoundError: # pragma: no cover
tomllib = None # type: ignore
def detect_format(path: Path, explicit: str | None = None) -> str:
"""
Determine config format (toml vs ini-ish) from argument or filename.
"""
if explicit:
return explicit
suffix = path.suffix.lower()
name = path.name.lower()
if suffix == ".toml":
return "toml"
if suffix in {".ini", ".cfg", ".conf"} or name.endswith(".ini"):
return "ini"
# Fallback: treat as INI-ish
return "ini"
def parse_config(path: Path, fmt: str | None = None) -> tuple[str, Any]:
"""
Parse config file into a Python object:
TOML -> nested dict
INI -> configparser.ConfigParser
"""
fmt = detect_format(path, fmt)
if fmt == "toml":
if tomllib is None:
raise RuntimeError(
"tomllib/tomli is required to parse TOML files but is not installed"
)
with path.open("rb") as f:
data = tomllib.load(f)
return fmt, data
if fmt == "ini":
parser = configparser.ConfigParser()
parser.optionxform = str # preserve key case
with path.open("r", encoding="utf-8") as f:
parser.read_file(f)
return fmt, parser
raise ValueError(f"Unsupported config format: {fmt}")
def flatten_config(fmt: str, parsed: Any) -> list[tuple[tuple[str, ...], Any]]:
"""
Flatten parsed config into a list of (path_tuple, value).
Examples:
TOML: [server.tls] enabled = true
-> (("server", "tls", "enabled"), True)
INI: [somesection] foo = "bar"
-> (("somesection", "foo"), "bar")
For INI, values are processed as strings (quotes stripped when obvious).
"""
items: list[tuple[tuple[str, ...], Any]] = []
if fmt == "toml":
def _walk(obj: Any, path: tuple[str, ...] = ()) -> None:
if isinstance(obj, dict):
for k, v in obj.items():
_walk(v, path + (str(k),))
else:
items.append((path, obj))
_walk(parsed)
elif fmt == "ini":
parser: configparser.ConfigParser = parsed
for section in parser.sections():
for key, value in parser.items(section, raw=True):
raw = value.strip()
# Strip surrounding quotes from INI values for defaults
if len(raw) >= 2 and raw[0] == raw[-1] and raw[0] in {'"', "'"}:
processed: Any = raw[1:-1]
else:
processed = raw
items.append(((section, key), processed))
else: # pragma: no cover
raise ValueError(f"Unsupported format: {fmt}")
return items
def make_var_name(role_prefix: str, path: Iterable[str]) -> str:
"""
Build an Ansible var name like:
role_prefix_section_subsection_key
Sanitises parts to lowercase [a-z0-9_] and strips extras.
"""
role_prefix = role_prefix.strip().lower()
clean_parts: list[str] = []
for part in path:
part = str(part).strip()
part = part.replace(" ", "_")
cleaned_chars: list[str] = []
for c in part:
if c.isalnum() or c == "_":
cleaned_chars.append(c.lower())
else:
cleaned_chars.append("_")
cleaned_part = "".join(cleaned_chars).strip("_")
if cleaned_part:
clean_parts.append(cleaned_part)
if clean_parts:
return role_prefix + "_" + "_".join(clean_parts)
return role_prefix
def generate_defaults_yaml(
role_prefix: str, flat_items: list[tuple[tuple[str, ...], Any]]
) -> str:
"""
Create YAML for defaults/main.yml from flattened items.
"""
defaults: dict[str, Any] = {}
for path, value in flat_items:
var_name = make_var_name(role_prefix, path)
defaults[var_name] = value
return yaml.safe_dump(
defaults,
sort_keys=True,
default_flow_style=False,
allow_unicode=True,
)
def _generate_toml_template(role_prefix: str, data: dict[str, Any]) -> str:
"""
Generate a TOML Jinja2 template from parsed TOML dict.
Values become Jinja placeholders, with quoting preserved for strings:
foo = "bar" -> foo = "{{ prefix_foo }}"
port = 8080 -> port = {{ prefix_port }}
"""
lines: list[str] = []
def emit_kv(path: tuple[str, ...], key: str, value: Any) -> None:
var_name = make_var_name(role_prefix, path + (key,))
if isinstance(value, str):
lines.append(f'{key} = "{{{{ {var_name} }}}}"')
else:
lines.append(f"{key} = {{{{ {var_name} }}}}")
def walk(obj: dict[str, Any], path: tuple[str, ...] = ()) -> None:
scalar_items = {k: v for k, v in obj.items() if not isinstance(v, dict)}
nested_items = {k: v for k, v in obj.items() if isinstance(v, dict)}
if path:
header = ".".join(path)
lines.append(f"[{header}]")
for key, val in scalar_items.items():
emit_kv(path, str(key), val)
if scalar_items:
lines.append("")
for key, val in nested_items.items():
walk(val, path + (str(key),))
# Root scalars (no table header)
root_scalars = {k: v for k, v in data.items() if not isinstance(v, dict)}
for key, val in root_scalars.items():
emit_kv((), str(key), val)
if root_scalars:
lines.append("")
# Tables
for key, val in data.items():
if isinstance(val, dict):
walk(val, (str(key),))
return "\n".join(lines).rstrip() + "\n"
def _generate_ini_template(role_prefix: str, parser: configparser.ConfigParser) -> str:
"""
Generate an INI-style Jinja2 template from a ConfigParser.
Quoting heuristic:
foo = "bar" -> foo = "{{ prefix_section_foo }}"
num = 42 -> num = {{ prefix_section_num }}
"""
lines: list[str] = []
for section in parser.sections():
lines.append(f"[{section}]")
for key, value in parser.items(section, raw=True):
path = (section, key)
var_name = make_var_name(role_prefix, path)
value = value.strip()
if len(value) >= 2 and value[0] == value[-1] and value[0] in {'"', "'"}:
lines.append(f'{key} = "{{{{ {var_name} }}}}"')
else:
lines.append(f"{key} = {{{{ {var_name} }}}}")
lines.append("")
return "\n".join(lines).rstrip() + "\n"
def generate_template(fmt: str, parsed: Any, role_prefix: str) -> str:
"""
Dispatch to the appropriate template generator.
"""
if fmt == "toml":
if not isinstance(parsed, dict):
raise TypeError("TOML parser result must be a dict")
return _generate_toml_template(role_prefix, parsed)
if fmt == "ini":
if not isinstance(parsed, configparser.ConfigParser):
raise TypeError("INI parser result must be a ConfigParser")
return _generate_ini_template(role_prefix, parsed)
raise ValueError(f"Unsupported format: {fmt}")

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#!/bin/bash
poetry run pytest -vvvv --cov=jinjaturtle --cov-report=term-missing --disable-warnings

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# This is a TOML document
title = "TOML Example"
[owner]
name = "Tom Preston-Werner"
dob = 1979-05-27T07:32:00-08:00
[database]
enabled = true
ports = [ 8000, 8001, 8002 ]
data = [ ["delta", "phi"], [3.14] ]
temp_targets = { cpu = 79.5, case = 72.0 }
[servers]
[servers.alpha]
ip = "10.0.0.1"
role = "frontend"
[servers.beta]
ip = "10.0.0.2"
role = "backend"

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from __future__ import annotations
import sys
from pathlib import Path
import pytest
from jinjaturtle import cli
SAMPLES_DIR = Path(__file__).parent / "samples"
def test_cli_stdout_toml(capsys):
"""
Run the CLI on the TOML sample, printing to stdout.
Covers the no-output-path branches.
"""
cfg_path = SAMPLES_DIR / "tom.toml"
exit_code = cli._main([str(cfg_path), "-r", "jinjaturtle"])
assert exit_code == 0
captured = capsys.readouterr()
out = captured.out
# Headers printed when not writing to files
assert "# defaults/main.yml" in out
assert "# config.j2" in out
# Should contain some variables
assert "jinjaturtle_" in out
assert captured.err == ""
def test_cli_writes_output_files(tmp_path, capsys):
"""
Run the CLI on the INI sample, writing to files instead of stdout.
Covers the --defaults-output and --template-output branches.
"""
cfg_path = SAMPLES_DIR / "php.ini"
defaults_path = tmp_path / "defaults.yml"
template_path = tmp_path / "config.j2"
exit_code = cli._main(
[
str(cfg_path),
"-r",
"php",
"--defaults-output",
str(defaults_path),
"--template-output",
str(template_path),
]
)
assert exit_code == 0
assert defaults_path.is_file()
assert template_path.is_file()
defaults_text = defaults_path.read_text(encoding="utf-8")
template_text = template_path.read_text(encoding="utf-8")
assert "php_" in defaults_text
assert "php_" in template_text
captured = capsys.readouterr()
# When writing to files, we shouldn't print the big headers
assert "# defaults/main.yml" not in captured.out
assert "# config.j2" not in captured.out
def test_main_wrapper_exits_with_zero(monkeypatch):
"""
Cover the main() wrapper that raises SystemExit.
"""
cfg_path = SAMPLES_DIR / "tom.toml"
monkeypatch.setattr(
sys,
"argv",
["jinjaturtle", str(cfg_path), "-r", "jinjaturtle"],
)
with pytest.raises(SystemExit) as exc:
cli.main()
assert exc.value.code == 0

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from __future__ import annotations
from pathlib import Path
import pytest
import yaml
import jinjaturtle.core as core
from jinjaturtle.core import (
detect_format,
parse_config,
flatten_config,
generate_defaults_yaml,
generate_template,
make_var_name,
)
SAMPLES_DIR = Path(__file__).parent / "samples"
def test_make_var_name_basic():
# simple sanity checks on the naming rules
assert (
make_var_name("jinjaturtle", ("somesection", "foo"))
== "jinjaturtle_somesection_foo"
)
assert (
make_var_name("JinjaTurtle", ("Other-Section", "some value"))
== "jinjaturtle_other_section_some_value"
)
# no trailing underscores, all lowercase, no spaces
name = make_var_name("MyRole", (" Section Name ", "Key-Name "))
assert name == name.lower()
assert " " not in name
assert not name.endswith("_")
def test_make_var_name_empty_path_returns_prefix():
# Cover the branch where there are no path components.
assert make_var_name("MyRole", ()) == "myrole"
def test_detect_format_explicit_overrides_suffix(tmp_path: Path):
# Explicit format should win over file suffix.
cfg_path = tmp_path / "config.ini"
cfg_path.write_text("[section]\nkey=value\n", encoding="utf-8")
fmt = detect_format(cfg_path, explicit="toml")
assert fmt == "toml"
def test_detect_format_fallback_ini(tmp_path: Path):
# Unknown suffix should fall back to "ini".
cfg_path = tmp_path / "weird.cnf"
cfg_path.write_text("[section]\nkey=value\n", encoding="utf-8")
fmt, parsed = parse_config(cfg_path) # no explicit fmt
assert fmt == "ini"
# parsed should be an INI ConfigParser with our section/key
flat = flatten_config(fmt, parsed)
assert any(path == ("section", "key") for path, _ in flat)
def test_toml_sample_roundtrip():
toml_path = SAMPLES_DIR / "tom.toml"
assert toml_path.is_file(), f"Missing sample TOML file: {toml_path}"
fmt, parsed = parse_config(toml_path)
assert fmt == "toml"
flat_items = flatten_config(fmt, parsed)
assert flat_items, "Expected at least one flattened item from TOML sample"
defaults_yaml = generate_defaults_yaml("jinjaturtle", flat_items)
defaults = yaml.safe_load(defaults_yaml)
# defaults should be a non-empty dict
assert isinstance(defaults, dict)
assert defaults, "Expected non-empty defaults for TOML sample"
# all keys should be lowercase, start with prefix, and have no spaces
for key in defaults:
assert key.startswith("jinjaturtle_")
assert key == key.lower()
assert " " not in key
# template generation
template = generate_template(fmt, parsed, "jinjaturtle")
assert isinstance(template, str)
assert template.strip(), "Template for TOML sample should not be empty"
# each default variable name should appear in the template as a Jinja placeholder
for var_name in defaults:
assert (
var_name in template
), f"Variable {var_name} not referenced in TOML template"
def test_ini_php_sample_roundtrip():
ini_path = SAMPLES_DIR / "php.ini"
assert ini_path.is_file(), f"Missing sample INI file: {ini_path}"
fmt, parsed = parse_config(ini_path)
assert fmt == "ini"
flat_items = flatten_config(fmt, parsed)
assert flat_items, "Expected at least one flattened item from php.ini sample"
defaults_yaml = generate_defaults_yaml("php", flat_items)
defaults = yaml.safe_load(defaults_yaml)
# defaults should be a non-empty dict
assert isinstance(defaults, dict)
assert defaults, "Expected non-empty defaults for php.ini sample"
# all keys should be lowercase, start with prefix, and have no spaces
for key in defaults:
assert key.startswith("php_")
assert key == key.lower()
assert " " not in key
# template generation
template = generate_template(fmt, parsed, "php")
assert isinstance(template, str)
assert template.strip(), "Template for php.ini sample should not be empty"
# each default variable name should appear in the template as a Jinja placeholder
for var_name in defaults:
assert (
var_name in template
), f"Variable {var_name} not referenced in INI template"
def test_formats_match_expected_extensions():
"""
Sanity check that format detection lines up with the filenames
we’re using for the samples.
"""
toml_path = SAMPLES_DIR / "tom.toml"
ini_path = SAMPLES_DIR / "php.ini"
fmt_toml, _ = parse_config(toml_path)
fmt_ini, _ = parse_config(ini_path)
assert fmt_toml == "toml"
assert fmt_ini == "ini"
def test_parse_config_toml_missing_tomllib(monkeypatch):
"""
Force tomllib to None to hit the RuntimeError branch when parsing TOML.
"""
toml_path = SAMPLES_DIR / "tom.toml"
# Simulate an environment without tomllib/tomli
monkeypatch.setattr(core, "tomllib", None)
with pytest.raises(RuntimeError) as exc:
core.parse_config(toml_path, fmt="toml")
assert "tomllib/tomli is required" in str(exc.value)
def test_parse_config_unsupported_format(tmp_path: Path):
"""
Hit the ValueError in parse_config when fmt is neither 'toml' nor 'ini'.
"""
cfg_path = tmp_path / "config.whatever"
cfg_path.write_text("", encoding="utf-8")
with pytest.raises(ValueError):
parse_config(cfg_path, fmt="yaml")
def test_generate_template_type_and_format_errors():
"""
Exercise the error branches in generate_template:
- toml with non-dict parsed
- ini with non-ConfigParser parsed
- completely unsupported fmt
"""
# wrong type for TOML
with pytest.raises(TypeError):
generate_template("toml", parsed="not a dict", role_prefix="role")
# wrong type for INI
with pytest.raises(TypeError):
generate_template("ini", parsed={"not": "a configparser"}, role_prefix="role")
# unsupported format
with pytest.raises(ValueError):
generate_template("yaml", parsed=None, role_prefix="role")