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#!/bin/sh
# Generates an index of which Vim version introduced a help tag.
if [ $# -ne 1 ]; then
echo 'Missing required Vim repository argument!' >&2
exit 1
fi
repo=$1
# Git tags in ascending order of date
tags=$(git -C "$repo" for-each-ref \
--sort committerdate \
--format '%(refname:short)' \
refs/tags)
# Iterate over sliding window of tags
tmp=$(mktemp -d)
mkfifo --mode=0600 "$tmp/p"
printf '\n%s' "$tags" > "$tmp/p" &
for p in $(echo "$tags" | paste --delimiters=: "$tmp/p" -); do
IFS=: read -r a b << EOF
$p
EOF
# Find all help tags added with $b
[ "$b" ] || continue
# Help tags are defined by placing the name between asterisks (*tag-name*)
git -C "$repo" diff "${a:-4b825dc642cb6eb9a060e54bf8d69288fbee4904}" "$b" \
--relative=runtime/doc --diff-filter=AM \
--unified=0 \
--word-diff=porcelain --word-diff-regex='\*[^*[:space:]]+\*' \
| sed --quiet '/^+/s/.*\*\([^*[:space:]]\+\)\*[^*]*/\1\n/gp' \
| sed -e '/^$/d' -e "s/^/$b\t/"
done \
| awk '!a[$2]++' # Remove duplicates
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