fzy-tmux

#! /usr/bin/env zsh
# Starts fzy in a tmux pane:
# fzy-tmux [-u|-d [HEIGHT[%]]] [-l|-r [WIDTH[%]]] [--] [FZY OPTIONS]
opt=''
swap=''
close=''
args=()
term=false
skip=false
lines=${LINES}

if [[ -z ${lines} ]] ; then
	lines=$(tput lines)
fi

while [[ $# -gt 0 ]] ; do
	local arg=$1
	case "${arg}" in
		-)
			term=true
			;;
		-w*|-h*|-d*|-u*|-r*|-l*)
			if ${skip} ; then
				args+=( "$1" )
				shift
				continue
			fi
			if [[ ${arg} =~ ^.[lrw] ]] ; then
				opt='-h'
				if [[ ${arg} =~ ^.l ]] ; then
					opt="${opt} -d"
					swap='; swap-pane -D ; select-pane -L'
					close='; tmux swap-pane -D'
				fi
			else
				opt=''
				if [[ ${arg} =~ ^.u ]] ; then
					opt="${opt} -d"
					swap='; swap-pane -D ; select-pane -U'
					close='; tmux swap-pane -D'
				fi
			fi
			if [[ ${#arg[@]} -gt 2 ]] ; then
				size=${arg:2}
			else
				shift
				if [[ $1 =~ ^[0-9]+%?$ ]] ; then
					size=$1
				else
					if [[ -n $1 && $1 != -- ]] ; then
						args+=( "$1" )
					fi
					shift
					continue
				fi
			fi

			if [[ ${size} =~ %$ ]] ; then
				size=${size:0:-1}
				if [[ -n ${swap} ]] ; then
					opt="${opt} -p $(( 100 - size ))"
				else
					opt="${opt} -p ${size}"
				fi
			else
				if [[ -n ${swap} ]] ; then
					local max
					if [[ ${arg} =~ ^.l ]] ; then
						max=${COLUMNS}
						if [[ -z ${COLUMNS} ]] ; then
							max=$(tput cols)
						fi
					else
						max=${lines}
					fi
					size=$(( max - size ))
					if [[ ${size} -lt 0 ]] ; then
						size=0
					fi
				fi
				opt="${opt} -l ${size}"
			fi
			;;
		--)
			skip=true
			;;
	esac
	shift
done

if [[ -z ${TMUX} || ${lines} -le 15 ]] ; then
	exec fzy "${args[@]}"
fi

zoomed=false
if tmux list-panes -F '#F' | grep -q Z ; then
	zoomed=true
	original_window=$(tmux display-message -p '#{window_id}')
	tmp_window=$(tmux new-window -d -P -F '#{window_id}'
		"zsh -c 'while :; do for c in \\| / - \\\\; do sleep 0.2; printf
		\"\\r%s fzy-tmux is running\\r\" \"\${c}\"; done; done'")
	tmux swap-pane -t ${tmp_window} \; select-window -t ${tmp_window}
fi

set -e

id="${RANDOM}:$$"
argsf="${TMPDIR:-/tmp}/fzy-argsf-${id}"
fifo1="${TMPDIR:-/tmp}/fzy-fifo1-${id}"
fifo2="${TMPDIR:-/tmp}/fzy-fifo2-${id}"
fifo3="${TMPDIR:-/tmp}/fzy-fifo3-${id}"

cleanup () {
	rm -f "${argsf}" "${fifo1}" "${fifo2}" "${fifo3}"
	if ${zoomed} ; then
		tmux swap-pane -t ${original_window} \; \
			select-window -t ${original_window} \; \
			kill-window -t ${tmp_window} \; \
			resize-pane -Z
	fi
}
trap cleanup EXIT INT TERM

mkfifo -m o+w "${fifo2}"
mkfifo -m o+w "${fifo3}"

opts=""
for arg in "${args[@]}" ; do
	arg=${arg//\\/\\\\}
	arg=${arg//\"/\\\"}
	arg=${arg//\`/\\\`}
	opts="${opts} \"${arg}\""
done

if ${term} || [[ -t 0 ]] ; then
	cat > "${argsf}" <<< "fzy ${opts} -l \${LINES} > '${fifo2}' ; echo \? > '${fifo3}' ${close}"
	tmux \
		set-window-option synchronize-panes off \; \
		set-window-option remain-on-exit    off \; \
		split-window ${opt} "cd $(printf %q "${PWD}"); zsh '${argsf}'" ${swap} \
		> /dev/null 2>&1
else
	mkfifo "${fifo1}"
	cat > "${argsf}" <<< "fzy ${opts} -l \${LINES} < '${fifo1}' > '${fifo2}' ; echo \? > '${fifo3}' ${close}"
	tmux \
		set-window-option synchronize-panes off \; \
		set-window-option remain-on-exit    off \; \
		split-window ${opt} "zsh '${argsf}'" ${swap} \
		> /dev/null 2>&1
	cat <&0 > "${fifo1}" &
fi
cat "${fifo2}"
exit "$(cat "${fifo3}")"