Options to disable/enable rules

[verhovsky]

Context

I want to format a bunch of markdown files, but I don't want to apply all the rules, just one important rule.

For example, I have this in my frontmatter

contributors:
    - ["First Last", "[email protected]"]

which is changing the indentation and removing the quotes around the name. I don't want this.

Proposal

A syntax like https://github.com/markdownlint/markdownlint has for enabling/disabling rules

mdformat -r ~frontmatter *.md

Tasks and updates

No response

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[hukkin]

Frontmatter is not a CommonMark rule so there is not support for it in mdformat without plugins. Does installing mdformat-frontmatter plugin solve your problem?

[verhovsky]

I have it installed, that's why it's formatting the frontmatter. Without it installed the mdformat treats it as markdown and completely destroys it, starting by replacing --- with a long line of ---------------------------. But there are other rules I wanted to disable, that was just an example. In fact, I only wanted one rule. I ended up hacking together a Python script with ChatGPT to do it instead and checking its output by hand

import sys
import glob

def process_files(filenames):
    for filename in filenames:
        with open(filename, "r") as file:
            lines = file.readlines()

        code_fence_count = [0] * len(lines)
        for i, line in enumerate(lines):
            if i > 0:
                code_fence_count[i] = code_fence_count[i-1]
            if line.strip().startswith("```"):
                code_fence_count[i] += 1

        save = False
        modified_lines = []
        for i, line in enumerate(lines):
            if line.strip().startswith("```"):
                if "groovy" in filename and 'ca-es' in filename:
                    pass
                is_starting_fence = code_fence_count[i] % 2 == 1
                if is_starting_fence:
                    if i > 0 and lines[i-1].strip():
                        save = True
                        modified_lines.append("\n")
                    # Remove any empty lines immediately after the opening fence
                    while i + 1 < len(lines) and not lines[i+1].strip():
                        i += 1
                else:
                    # Remove any empty lines immediately before the closing fence
                    while modified_lines and not modified_lines[-1].strip():
                        modified_lines.pop()
                    if i < len(lines) - 1 and lines[i+1].strip():
                        line += "\n"
            modified_lines.append(line)

        if save and not "markdown" in filename.removesuffix(".markdown") and "vim" not in filename and "livescript" not in filename:
            with open(filename, "w") as file:
                file.writelines(modified_lines)

def main():
    if len(sys.argv) > 1:
        filenames = sys.argv[1:]
    else:
        # Process all .md and .markdown files in the current directory
        filenames = glob.glob("**/*.md") + glob.glob("**/*.markdown")

    process_files(filenames)

if __name__ == "__main__":
    main()

https://github.com/adambard/learnxinyminutes-docs/commit/01bbd084f1908a6815d53a1bd42b02c042e44bdb