tmux multi-pane window launcher

tmux-launch.sh

#!/bin/bash

loc=$(dirname $0)
me=$(basename $0)

PS4='+(${BASH_SOURCE}:${LINENO}):${FUNCNAME[0]:+${FUNCNAME[0]}()}: '

# process command line options
NUM=0
HORIZONTAL=0
TILED=0
VERBOSE=":"

while getopts Hhn:Tv option;
do

  case "$option"
  in

    H)  HORIZONTAL=1;;
    n)  NUM=$OPTARG;;
    T)  TILED=1;;
    v)  VERBOSE="set -x";;
    h)  cat <<EOF >&2

USAGE: ${me} [options] SESSION DIR:[CMD] [DIR:[CMD]] ...

   -h        display this help
   -n <NUM>  launch <NUM> panes in the first specified directory, DIR
   -H        horizontal split instead of the default vertical split
   -v        enable verbose output

   [DIR]   one or more startup directories; at least one is required
   [CMD]   optional command string associated with DIR; this can contain multiple commands if quoted

EOF
        exit 2
        ;;

  esac

done

shiftcount=`expr $OPTIND - 1`
shift $shiftcount

# -------------------------------------------------------------------------------

if [[ -z $2 ]]; then
    current=$(tmux display -p "#S")
    echo -e "\n   *** ERROR: missing arguments. ***"
    $0 -h
    if [[ -n $current ]]; then
        echo -e "current session: $current\n"
    fi
    exit 1
else
    session="$1"
    shift
fi

if [ ${NUM} -gt 0 ]; then

    i=0
    while [ $i -lt ${NUM} ]; do
        args[$i]=$1
        i=$(expr $i + 1)
    done

else

    args=( "$@" )

fi

# echo ${arg[@]}

# start tmux
( ${VERBOSE}; tmux new-session -s $session -d )
( ${VERBOSE}; tmux ls )

i=1
for e in "${args[@]}"; do

    # capture directory and optional command from $e
    d=$(echo $e | awk -F: '{print $1}')
    c=$(echo $e | awk -F: '{print $2}')

    if [ ! -d $d ]; then
        echo WARNING: directory does not exist, $d >&2
        continue
    fi

    # Select pane $i, set dir to $d, run pwd
    if [ $i -gt 1 ]; then
        ( ${VERBOSE}; tmux split-window -t $(expr $i - 1) )
    fi
    ( ${VERBOSE}; tmux select-pane -t $i )
    ( ${VERBOSE}; tmux send-keys -t $i "cd $d" C-m )
    if [ -n "$c" ]; then
        # execute optional command
        ( ${VERBOSE}; tmux send-keys -t $i "$c" C-m )
    fi

    # equally-spaced
    if [ ${HORIZONTAL} -ne 0 ]; then
        ( ${VERBOSE}; tmux select-layout even-horizontal )
    elif [ ${TILED} -ne 0 ]; then
        ( ${VERBOSE}; tmux select-layout tiled )

    else
        tmux select-layout even-vertical
    fi

    i=$(expr $i + 1)

done

# Finished setup, attach to the tmux session!
( ${VERBOSE}; tmux attach-session -t $session )