beet-hook-diff-cli_exit

#!/usr/bin/env bash

: "${TMPDIR:=/tmp}"
: "${XDG_CONFIG_HOME:=${HOME}/.config}"
: "${BEETS_LIBRARY=$XDG_CONFIG_HOME/beets/library.db}"
: "${DIFF:-}"

: "${DIFF:=diff -u --color}"

set -euo pipefail

session="$TMPDIR/beets/hook-diff-$PPID"

if ! [[ -e "$session/library.sql.before" ]]; then
    printf 'error: %s does not exit; was the pluginload hook ran?\n' \
        "$session/library.sql.before" \
        >&2
    exit 127
fi

sha1sum "$BEETS_LIBRARY" | cut -c1-40 >"$session/after.sha1sum"

e=0
if [[ "$(<"$session/before.sha1sum")" != "$(<"$session/after.sha1sum")" ]]; then
    (
        sqlite3 -readonly -batch \
            "$BEETS_LIBRARY" \
            '.dump' \
            >"$session/library.sql.after"

        eval "${DIFF}" -- "$session/library.sql.before" "$session/library.sql.after" || :
    ) || e=$?
fi

beets_sessions_count=$(pgrep -c beet)

sessions=("${session%/*}"/hook-diff-*)
if [[ "${#sessions[@]}" -ne "$beets_sessions_count" ]]; then
    rm -rf "${sessions[@]}"
else
    rm -rf "$session"
fi

exit "$e"