renag
Short for Regex (re) Nag (like "one who complains").
Now also PEGs (Parsing Expression Grammars) compatible with pyparsing!
A Regex based linter tool that works for any language and works exclusively with custom linting rules.
Complainers
renag is based on the concept of Complainers. See renag/complainer.py for the interface to create your own Complainer and examples for some prebuilt examples.
Complainers can be as simple as the following:
class PrintComplainer(Complainer):
"""Print statements can slow down code."""
capture = r"print\(.*\)"
severity = Severity.WARNING
glob = ["*.py"]
This has 4 fundamental parts:
docstring- The docstring of the class automatically becomes the description of the error.capture- A regex statement that, if matched, will raise the complaint.severity- EitherWARNINGwhich will return exit code 0, orCRITICALwhich will return exit code 1.glob- A list of glob wildcards that define what files to run theComplaineron.
Next you can add a check method to your Complainer if you would like something more complicated than simple regex.
class PrintComplainer(Complainer):
"""Print statements can slow down code."""
...
def check(self, txt: str, path: Path, capture_span: Span) -> List[Complaint]:
"""Check that the print statement is not commented out before complaining."""
# Get the line number
lines, line_numbers = get_lines_and_numbers(txt, capture_span)
# Check on the first line of the capture_span that the capture is not preceded by a '#'
# In such a case, the print has been commented out
if lines[0].count("#") > 0 and lines[0].index("#") < capture_span[0]:
# If it is the case that the print was commented out, we do not need to complain
# So we will return an empty list of complaints
return []
# Otherwise we will do as normal
return super().check(txt=txt, path=path, capture_span=capture_span)
Adding to your project
Simply put this complainer in a python module in your project like so:
root/
complainers_dir_name/
__init__.py
custom_complainer1.py
custom_complainer2.py
...
the-rest-of-your-project
...
Import each complainer inside __init__.py so it can be imported via from .{complainers_dir_name} import *.
Then add the following to your .pre-commit-hooks.yaml file:
- repo: https://github.com/ryanpeach/renag
rev: "0.3.4"
hooks:
- id: renag
args:
- "--load_module"
- "{complainers_dir_name}"
- "--staged"
Run renag --help to see a list of command line arguments you can add to the hook.
Output
Complaint printout modeled after rust error reporting. Example of a Complaint:
Severity.WARNING - EasyPrintComplainer: Print statements can slow down code.
--> renag/__main__.py
147| )
148| print()
149|
150| # End by exiting the program
151| if N == 0:
152| print(color_txt("No complaints. Enjoy the rest of your day!", BColors.OKGREEN))
152| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
153| exit(0)
154| if N_WARNINGS > 0 and N_CRITICAL == 0:
155| print(
156| color_txt(
157| f"{N} Complaints found: {N_WARNINGS} Warnings, {N_CRITICAL} Critical.",
iregex
All regex captures in this module default to using iregex. iregex can help make your regex more understandable to readers, and allow you to compose large regex statements (see examples/regex.py for examples).
2 May 12, 2022
24 Sep 20, 2022
7 Dec 15, 2021
44 Oct 29, 2022
2 Jan 9, 2022
15 Oct 19, 2022
4 Jan 2, 2023
62 Dec 19, 2022
4 Jan 1, 2022
18 Jul 20, 2022
5 May 02, 2022
3 Mar 24, 2022
13 Oct 31, 2022
24 Aug 06, 2022
6 Jul 14, 2022
1 Oct 28, 2021
20 Jun 11, 2021
293 Dec 30, 2022
5 Nov 14, 2021
2 Feb 02, 2022
1 Nov 09, 2021
8 Feb 16, 2022
6 Dec 12, 2022
18 Dec 29, 2022
2 Jan 25, 2022
4 Aug 04, 2022
240 Jan 06, 2023
96 Dec 26, 2022
6 Jan 20, 2022