#!/bin/sh

set -e

usage() {
	cat <<'EOF'
Usage: kakpipe [OPTIONS] [-- KAK_ARGS...]

Edit standard input in Kakoune, then write the result to standard output.

This allows Kakoune to be used in the middle of a pipeline:

	command1 | kakpipe | command2

Options:
	-s, --suffix EXT  Append .EXT to the temporary file name.
	                  Enables Kakoune syntax highlighting
	                  and other filetype-related functionality.
	-h, --help        Show this message and exit.

All arguments after '--' are passed directly to Kakoune.

Examples:
	ls | kakpipe | wc -l
	jq . data.json | kakpipe -s json | less
	command1 | kakpipe -e 'set-option window indentwidth 4' | command2

Author: Daniel Fichtinger <daniel AT ficd DOT sh>
License: BSD-0-CLAUSE
EOF
}

while [ "$#" -gt 0 ]; do
	case "$1" in
	-h | --help)
		usage
		exit 1
		;;
	-s | --suffix)
		suffix="$2"
		shift 2
		;;
	--)
		shift
		break
		;;
	*)
		break
		;;
	esac
done

tmp="$(mktemp /tmp/kakpipe.XXXXXX${suffix:+.$suffix})" || exit 1
trap 'rm -f "$tmp"' EXIT INT TERM HUP
cat >"$tmp"
exec 3>&1
exec </dev/tty >/dev/tty
kak "$@" "$tmp"
exec >&3
cat "$tmp"