qusal/scripts/toc-gen.sh
2023-11-13 14:33:28 +00:00

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#!/bin/sh
## SPDX-FileCopyrightText: 2023 Benjamin Grande M. S. <ben.grande.b@gmail.com>
##
## SPDX-License-Identifier: AGPL-3.0-or-later
## Requires: https://github.com/mzlogin/vim-markdown-toc
set -eu
usage(){
echo "Usage: ${0##*/} <file> [file ...]"
exit 1
}
case "${1-}" in
""|-h|--help) usage;;
esac
## vim-markdown-toc deletes lines if they are folded, can't rely on its native
## update on save.
if ! vim -e -c 'setf markdown' -c 'if !exists(":GenTocGFM") | cq | endif' -c q
then
echo "Error: Vim Plugin mzlogin/vim-markdown-toc is not installed." >&2
exit 1
fi
for f in "$@"; do
if ! test -f "$f"; then
echo "Error: Not a regular file: $f" >&2
exit 1
fi
if ! grep -q "^## Table of Contents$" "$f"; then
echo "Could not find table of contents in file: $f, skipping" >&2
continue
fi
## This is fragile, the table of contents should have at least one block
## separated by an empty line before the nest heading, else it will delete
## the rest of the file.
vim -c 'norm zRgg' -c '/^## Table of Contents$' -c 'norm jd}k' -c ':GenTocGFM' -c 'norm ddgg' -c wq -- "${f}"
echo "Updated TOC in file: $f"
done