add a way to silence warnings from GitLab's [[_TOC_]] things

#!/bin/sh

# This script will pass provided arguments to markdownlint (mdl), with

# Kramdown warnings enabled, but with the GitLab-specific (and

# non-standard) [[_TOC_]] blob removed. This only works on single

# files, if provided a directory, it will just throw the entire thing

# at mdl.

for path in "$@"; do

    if [ -f "$path" ]; then

        sed 's/^\[\[_TOC_\]\]/TOC_PLACEHOLDER/' "$path" | markdownlint -

    else

        markdownlint "$path"

    fi

done