#!/bin/sh
# Regenerate the whole-corpus prune diff. The plan gates the timer on reviewing
# this, and the same gate should be re-runnable after any change to the rule.
set -eu

NOTES="${1:-$HOME/docs/notes/todo}"
HERE=$(cd "$(dirname "$0")" && pwd)
OUT="${OUT:-$HOME/todo-prune-review.diff}"

tmp=$(mktemp)
trap 'rm -f "$tmp"' EXIT

: > "$OUT"
files=0
for f in "$NOTES"/*.md; do
    # Compare files rather than shell strings: command substitution eats
    # trailing newlines and would invent differences that are not there.
    python3 "$HERE/prune.py" "$f" > "$tmp"
    if ! cmp -s "$f" "$tmp"; then
        diff -u --label "$f (now)" --label "$f (pruned)" "$f" "$tmp" >> "$OUT" || true
        files=$((files + 1))
    fi
done

all=$(grep -c '^-' "$OUT" || true)
hdr=$(grep -c '^--- ' "$OUT" || true)
echo "$OUT: $((all - hdr)) lines removed across $files files"