# 🏳️⚧️ Transdoc 🏳️⚧️
A simple tool for transforming Python docstrings by embedding results from
Python function calls.
## Installation
`pip install transdoc`
## Usage
Creating transformation rules is as simple as defining Python functions.
```py
# rules.py
def my_rule() -> str:
'''
A simple rule for rewriting docstrings
'''
return f"This text was added by Transdoc!"
```
They can then be used by placing their name within `{{` double braces `}}` in
any docstring.
```py
# program.py
def say_hi(name: str) -> str:
'''
Says hello to someone.
{{my_rule}}
'''
return f"Hello, {name}!"
```
By executing `transdoc program.py -o program_transformed.py -r rules.py`,
Transdoc will produce a file `program_transformed.py` with the following
contents:
```py
# program.py
def say_hi(name: str) -> str:
'''
Says hello to someone.
This text was added by Transdoc!
'''
return f"Hello, {name}!"
```
Rules can be as complex as you need, accepting any number of arguments. You can
call them like you would call the original Python function.
```py
# rules.py
def repeat(text: str, n: int = 2) -> str:
'''
Repeat the given text any number of times.
'''
return " ".join([text for _ in range(n)])
```
Using this rule to transform the following code
```py
def say_hi(name: str) -> str:
'''
Says hello to someone.
{{repeat('wowee!')}}
{{repeat('WOWEE!', n=5)}}
'''
return f"Hello, {name}!"
```
will produce this result:
```py
def say_hi(name: str) -> str:
'''
Says hello to someone.
Wowee! Wowee!
WOWEE! WOWEE! WOWEE! WOWEE! WOWEE!
'''
return f"Hello, {name}!"
```
Since passing a single string as an argument is so common, Transdoc adds a
special syntax for this. Simply place the string argument in square brackets.
```py
def mdn_link(e: str) -> str:
'''
Return a Markdown-formatted link for an HTML element
'''
return (
f"[View <{e}> on MDN]"
f"(https://developer.mozilla.org/en-US/docs/Web/HTML/Element/{e})"
)
```
Using this rule to transform the following code
```py
def make_link(text: str, href: str) -> str:
'''
Generate an HTML link.
{{mdn_link[a]}}
'''
# Please don't write code this insecure in real life
return f"<a href={href}>{text}</a>"
```
will produce this result:
```py
def make_link(text: str, href: str) -> str:
'''
Generate an HTML link.
[View <a> on MDN](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a)
'''
# Please don't write code this insecure in real life
return f"<a href={href}>{text}</a>"
```
## Library usage
Transdoc also offers a simple library which can be used to perform these
operations programmatically.
```py
import transdoc
def fancy():
return "✨fancy✨"
def my_function():
'''Wow this is some {{fancy}} documentation'''
result = transdoc.transform(
my_function, # Code to transform
[fancy], # Rules to use in transformation (or a module containing rules)
)
# Result now contains a string with the transformed source code for my_function
```
## Integration with build systems
You can integrate Transdoc with project management systems and use it as a
pre-build script, so that your docstrings can be automatically built right
before packaging and distributing your project.
### Poetry
The system is undocumented and unstable, however it is possible (according to
[this GitHub comment](https://github.com/python-poetry/poetry/issues/5539#issuecomment-1126818974))
to get a pre-build script added.
In `pyproject.toml`:
```toml
[tool.poetry.build]
generate-setup-file = false
script = "build.py"
# ...
[build-system]
requires = ["poetry-core", "transdoc"]
build-backend = "poetry.core.masonry.api"
```
In a file `build.py`:
```py
import transdoc
exit(transdoc.main("src", "rules.py", "build_dir", force=True))
```
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