# ansible-specdoc
A utility for dynamically generating documentation from an Ansible module's spec.
This project was primarily designed for the [Linode Ansible Collection](https://github.com/linode/ansible_linode).
An example Ansible Collection using `ansible-specdoc` can be found [here](https://github.com/linode/ansible-specdoc-example).
## Usage
```sh
ansible-specdoc [-h] [-s] [-n MODULE_NAME] [-i INPUT_FILE] [-o OUTPUT_FILE] [-f {yaml,json,jinja2}] [-j] [-t TEMPLATE_FILE]
Generate Ansible Module documentation from spec.
options:
-h, --help show this help message and exit
-s, --stdin Read the module from stdin.
-n MODULE_NAME, --module-name MODULE_NAME
The name of the module (required for stdin)
-i INPUT_FILE, --input_file INPUT_FILE
The module to generate documentation from.
-o OUTPUT_FILE, --output_file OUTPUT_FILE
The file to output the documentation to.
-f {yaml,json,jinja2}, --output_format {yaml,json,jinja2}
The output format of the documentation.
-j, --inject Inject the output documentation into the `DOCUMENTATION`, `RETURN`, and `EXAMPLES` fields of input module.
-t TEMPLATE_FILE, --template_file TEMPLATE_FILE
The file to use as the template for templated formats.
-c, --clear_injected_fields,
Clears the DOCUMENTATION, RETURNS, and EXAMPLES fields in specified module and sets them to an empty string.
```
---
#### Generating a templated documentation file:
```shell
ansible-specdoc -f jinja2 -t path/to/my/template.md.j2 -i path/to/my/module.py -o path/to/output/file.md
```
---
#### Dynamically generating and injecting documentation back into module constants:
```shell
ansible-specdoc -j -i path/to/my/module.py
```
NOTE: Documentation string injection requires that you have `DOCUMENTATION`, `RETURN`, and `EXAMPLES` constants defined in your module.
---
#### Generating a raw documentation string (not recommended):
```shell
ansible-specdoc -f yaml -i path/to/my/module.py
```
## Implementation
### Importing SpecDoc Classes
All of the `ansible-specdoc` classes can be imported into an Ansible module using the following statement:
```python
from ansible_specdoc.objects import *
```
Alternatively, only specific classes can be imported using the following statement:
```python
from ansible_specdoc.objects import SpecDocMeta, SpecField, SpecReturnValue, FieldType, DeprecationInfo
```
### Declaring Module Metadata
The `ansible-specdoc` specification format requires that each module exports a `SPECDOC_META` object with the following structure:
```python
SPECDOC_META = SpecDocMeta(
description=['Module Description'],
requirements=['python >= 3.6'],
author=['Author Name'],
options=module_spec,
examples=[
'example module usage'
],
return_values={
'my_return_value': SpecReturnValue(
description='A generic return value.',
type=FieldType.string,
sample=['sample response']
),
}
)
```
### Declaring Argument Specification
Each `SpecField` object translates to a parameter that can be rendered into documentation and passed into Ansible for specification.
These fields should be declared in a dict format as shown below:
```python
module_spec = {
'example_argument': SpecField(
type=FieldType.string,
required=True,
description=['An example argument.']
)
}
```
This dict should be passed into the `options` field of the `SPECDOC_META` declaration.
### Passing Specification to Ansible
In order to retrieve the Ansible-compatible spec dict, use the `SPECDOC_META.ansible_spec` property.
### Other Notes
To prevent `ansible-specdoc` from executing module code, please ensure that all module logic executes using the following pattern:
```python
if __name__ == '__main__':
main()
```
---
To deprecate a module, specify the `deprecated` field as follows:
```python
SPECDOC_META = SpecDocMeta(
...
deprecated=DeprecationInfo(
alternative='my.new.module',
removed_in='1.0.0',
why='Reason for deprecation'
)
)
```
When deprecating a module, you will also need to update your `meta/runtime.yml` file.
Please refer to the [official Ansible deprecation documentation](https://docs.ansible.com/ansible/latest/dev_guide/module_lifecycle.html#deprecating-modules-and-plugins-in-a-collection) for more details.
## Templates
This repository provides an [example Markdown template](./template/module.md.j2) that can be used in conjunction with the `-t` argument.
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