fzf/bin/fzf-tmux

#!/usr/bin/env bash
# fzf-tmux: starts fzf in a tmux pane
# usage: fzf-tmux [LAYOUT OPTIONS] [--] [FZF OPTIONS]

fail() {
  >&2 echo "$1"
  exit 2
}

fzf="$(command which fzf)" || fzf="$(dirname "$0")/fzf"
[[ -x $fzf ]] || fail 'fzf executable not found'

args=()
opt=""
skip=""
swap=""
close=""
term=""
[[ -n $LINES ]] && lines=$LINES || lines=$(tput lines) || lines=$(tmux display-message -p "#{pane_height}")
[[ -n $COLUMNS ]] && columns=$COLUMNS || columns=$(tput cols) || columns=$(tmux display-message -p "#{pane_width}")

tmux_version=$(tmux -V | sed 's/[^0-9.]//g')
tmux_32=$(awk '{print ($1 >= 3.2)}' <<< "$tmux_version" 2> /dev/null || bc -l <<< "$tmux_version >= 3.2")

help() {
  >&2 echo 'usage: fzf-tmux [LAYOUT OPTIONS] [--] [FZF OPTIONS]

  LAYOUT OPTIONS:
    (default layout: -d 50%)

    Popup window (requires tmux 3.2 or above):
      -p [WIDTH[%][,HEIGHT[%]]]  (default: 50%)
      -w WIDTH[%]
      -h HEIGHT[%]
      -x COL
      -y ROW

    Split pane:
      -u [HEIGHT[%]]             Split above (up)
      -d [HEIGHT[%]]             Split below (down)
      -l [WIDTH[%]]              Split left
      -r [WIDTH[%]]              Split right
'
  exit
}

while [[ $# -gt 0 ]]; do
  arg="$1"
  shift
  [[ -z $skip ]] && case "$arg" in
    -)
      term=1
      ;;
    --help)
      help
      ;;
    --version)
      echo "fzf-tmux (with fzf $("$fzf" --version))"
      exit
      ;;
    -p* | -w* | -h* | -x* | -y* | -d* | -u* | -r* | -l*)
      if [[ $arg =~ ^-[pwhxy] ]]; then
        [[ $opt =~ "-E" ]] || opt="-E"
      elif [[ $arg =~ ^.[lr] ]]; 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}"
        [[ $size =~ ^[0-9%,]+$ || $size =~ ^[A-Z]$ ]] || continue
      else
        if [[ $1 =~ ^[0-9%,]+$ ]] || [[ $1 =~ ^[A-Z]$ ]]; then
          size="$1"
          shift
        else
          continue
        fi
      fi

      if [[ $arg =~ ^-p ]]; then
        if [[ -n $size ]]; then
          w=${size%%,*}
          h=${size##*,}
          opt="$opt -w$w -h$h"
        fi
      elif [[ $arg =~ ^-[whxy] ]]; then
        opt="$opt ${arg:0:2}$size"
      elif [[ $size =~ %$ ]]; then
        size=${size:0:${#size}-1}
        if [[ $tmux_32 == 1 ]]; then
          if [[ -n $swap ]]; then
            opt="$opt -l $((100 - size))%"
          else
            opt="$opt -l $size%"
          fi
        else
          if [[ -n $swap ]]; then
            opt="$opt -p $((100 - size))"
          else
            opt="$opt -p $size"
          fi
        fi
      else
        if [[ -n $swap ]]; then
          if [[ $arg =~ ^.l ]]; then
            max=$columns
          else
            max=$lines
          fi
          size=$((max - size))
          [[ $size -lt 0 ]] && size=0
          opt="$opt -l $size"
        else
          opt="$opt -l $size"
        fi
      fi
      ;;
    --)
      # "--" can be used to separate fzf-tmux options from fzf options to
      # avoid conflicts
      skip=1
      continue
      ;;
    *)
      args+=("$arg")
      ;;
  esac
  [[ -n $skip ]] && args+=("$arg")
done

if [[ -z $TMUX ]]; then
  "$fzf" "${args[@]}"
  exit $?
fi

# * --height option is not allowed
# * CTRL-Z is also disabled
# * fzf-tmux script is not compatible with --tmux option in fzf 0.53.0 or later
args=("${args[@]}" "--no-height" "--bind=ctrl-z:ignore" "--no-tmux")

# Handle zoomed tmux pane without popup options by moving it to a temp window
if [[ ! $opt =~ "-E" ]] && tmux list-panes -F '#F' | grep -q Z; then
  zoomed_without_popup=1
  original_window=$(tmux display-message -p "#{window_id}")
  tmp_window=$(tmux new-window -d -P -F "#{window_id}" "bash -c 'while :; do for c in \\| / - '\\;' do sleep 0.2; printf \"\\r\$c fzf-tmux is running\\r\"; done; done'")
  tmux swap-pane -t $tmp_window \; select-window -t $tmp_window
fi

set -e

# Clean up named pipes on exit
tmpdir=$(mktemp -d "${TMPDIR:-/tmp}/fzf-tmux-XXXXXX")
argsf="$tmpdir/args"
fifo1="$tmpdir/fifo1"
fifo2="$tmpdir/fifo2"
fifo3="$tmpdir/fifo3"
if tmux_win_opts=$(tmux show-options -p remain-on-exit \; show-options -p synchronize-panes 2> /dev/null); then
  tmux_win_opts=($(sed '/ off/d; s/synchronize-panes/set-option -p synchronize-panes/; s/remain-on-exit/set-option -p remain-on-exit/; s/$/ \\;/' <<< "$tmux_win_opts"))
  tmux_off_opts='; set-option -p synchronize-panes off ; set-option -p remain-on-exit off'
else
  tmux_win_opts=($(tmux show-window-options remain-on-exit \; show-window-options synchronize-panes | sed '/ off/d; s/^/set-window-option /; s/$/ \\;/'))
  tmux_off_opts='; set-window-option synchronize-panes off ; set-window-option remain-on-exit off'
fi
cleanup() {
  \rm -rf "$tmpdir"
  # Restore tmux window options
  if [[ ${#tmux_win_opts[@]} -gt 1 ]]; then
    eval "tmux ${tmux_win_opts[*]}"
  fi

  # Remove temp window if we were zoomed without popup options
  if [[ -n $zoomed_without_popup ]]; then
    tmux display-message -p "#{window_id}" > /dev/null
    tmux swap-pane -t $original_window \; \
      select-window -t $original_window \; \
      kill-window -t $tmp_window \; \
      resize-pane -Z
  fi

  if [[ $# -gt 0 ]]; then
    trap - EXIT
    exit 130
  fi
}
trap 'cleanup 1' SIGUSR1
trap 'cleanup' EXIT

envs="export TERM=$(printf %q "$TERM") "
if [[ $opt =~ "-E" ]]; then
  if [[ $tmux_version == 3.2 ]]; then
    FZF_DEFAULT_OPTS="--margin 0,1 $FZF_DEFAULT_OPTS"
  elif [[ $tmux_32 == 1 ]]; then
    FZF_DEFAULT_OPTS="--border $FZF_DEFAULT_OPTS"
    opt="-B $opt"
  else
    echo "fzf-tmux: tmux 3.2 or above is required for popup mode" >&2
    exit 2
  fi
fi
envs="$envs FZF_DEFAULT_COMMAND=$(printf %q "$FZF_DEFAULT_COMMAND")"
envs="$envs FZF_DEFAULT_OPTS=$(printf %q "$FZF_DEFAULT_OPTS")"
envs="$envs FZF_DEFAULT_OPTS_FILE=$(printf %q "$FZF_DEFAULT_OPTS_FILE")"
[[ -n $RUNEWIDTH_EASTASIAN ]] && envs="$envs RUNEWIDTH_EASTASIAN=$(printf %q "$RUNEWIDTH_EASTASIAN")"
[[ -n $BAT_THEME ]] && envs="$envs BAT_THEME=$(printf %q "$BAT_THEME")"
echo "$envs;" > "$argsf"

# Build arguments to fzf
opts=$(printf "%q " "${args[@]}")

pppid=$$
echo -n "trap 'kill -SIGUSR1 -$pppid' EXIT SIGINT SIGTERM;" >> $argsf
close="; trap - EXIT SIGINT SIGTERM $close"

export TMUX=$(cut -d , -f 1,2 <<< "$TMUX")
mkfifo -m o+w $fifo2
if [[ $opt =~ "-E" ]]; then
  cat $fifo2 &
  if [[ -n $term ]] || [[ -t 0 ]]; then
    cat <<< "\"$fzf\" $opts > $fifo2; out=\$? $close; exit \$out" >> $argsf
  else
    mkfifo $fifo1
    cat <<< "\"$fzf\" $opts < $fifo1 > $fifo2; out=\$? $close; exit \$out" >> $argsf
    cat <&0 > $fifo1 &
  fi

  tmux popup -d "$PWD" $opt "bash $argsf" > /dev/null 2>&1
  exit $?
fi

mkfifo -m o+w $fifo3
if [[ -n $term ]] || [[ -t 0 ]]; then
  cat <<< "\"$fzf\" $opts > $fifo2; echo \$? > $fifo3 $close" >> $argsf
else
  mkfifo $fifo1
  cat <<< "\"$fzf\" $opts < $fifo1 > $fifo2; echo \$? > $fifo3 $close" >> $argsf
  cat <&0 > $fifo1 &
fi
tmux \
  split-window -c "$PWD" $opt "bash -c 'exec -a fzf bash $argsf'" $swap \
  $tmux_off_opts \
  > /dev/null 2>&1 || {
  "$fzf" "${args[@]}"
  exit $?
}
cat $fifo2
exit "$(cat $fifo3)"