ssh-handler

#!/bin/bash -ue
# Christian Bryn <chr.bryn@gmail.com> 2013
# ssh-handler with somewhat limited tmux capabilities
# This script handles ssh hyperlinks (ssh://)
# Passing hosts without the protocol prefix also works

config_file=~/.ssh-handler.conf
## defaults
mode="default"
command="ssh"
# terminal emulators in prioritized order, highest priority first
terminals="urxvt xterm"

function print_usage() {
  cat <<EOF
Usage: ${0} [-h|-c <command>|-m <mode>|-t '<terminal> [<terminal>]'] <ssh://my.remote.host>
  -h  This.
  -c  Command used to connect to remote host. Defaults to '${command}'
  -m  Mode. Defaults to '${mode}'
  -t  Space separates list of terminal emulators. Defaults to '${terminals}'

Available modes:
  default, tmux

The following variables can be set in ${config_file}:
  mode="${mode}"
  command="${command}"
  terminals="$terminals"

Examples:
  ${0} ssh://my.remote.host
  ${0} my.remote.host
  ${0} -m tmux ssh://my.remote.host
  ${0} -c 'remmina -n --protocol=SSH -s'
  ${0} -t 'gnome-terminal xterm'
EOF
}

function tmux_open() {
  # open new tmux window and run supplied command
  # checks for a default running session called $USER,
  # if not it starts a new one called 'ssh'
  tmux_session=$USER
  if ( tmux has-session -t "${tmux_session}" )
  then
    tmux new-window -t "${tmux_session}" "$@"
  elif ( tmux has-session -t "ssh" )
  then
    tmux new-window -t "ssh" "$@"
  else
    tmux -2 new-session -s ssh -d "$@" \; attach
  fi
}

## read config file
if [ -f "${config_file}" ]; then
  source <( egrep "^mode=|^command=|^terminals=" "${config_file}" )
fi

while getopts hcmt o
do
  case $o in
    h)
      print_usage ; exit ;;
    c)
      command="$OPTARG" ;;
    m)
      mode="$OPTARG" ;;
    t)
      terminals="$OPTARG" ;;
  esac
done
shift $(($OPTIND-1))

[ $# -gt 0 ] || { echo 'No host URI given'; print_usage ; exit; }
dest=${1#ssh://}

case $mode in
  tmux)
    tmux_open "${command} ${dest}" ;;
  default)
    for t in $terminals
    do
      which $t >/dev/null || continue
      ${t} -e "${command} ${dest} " &
      break
    done
    ;;
esac