tmux executor

tmuxx.sh

#!/bin/bash

# is_login_shell returns true if current shell is first shell
is_login_shell() {
  [[ $SHLVL == 1 ]]
}

# is_git_repo returns true if cwd is in git repository
is_git_repo() {
  git rev-parse --is-inside-work-tree &>/dev/null
  return $status
}

# is_screen_running returns true if GNU screen is running
is_screen_running() {
  [[ -n $STY ]]
}

# is_tmux_runnning returns true if tmux is running
is_tmux_runnning() {
  [[ -n $TMUX ]]
}

# is_screen_or_tmux_running returns true if GNU screen or tmux is running
is_screen_or_tmux_running() {
  is_screen_running || is_tmux_runnning
}

# shell_has_started_interactively returns true if the current shell is
# running from command line
shell_has_started_interactively() {
  [[ -n $PS1 ]]
}

# is_ssh_running returns true if the ssh deamon is available
is_ssh_running() {
  [[ -n $SSH_CLIENT ]]
}

main() {
  # tmux_automatically_attach attachs tmux session automatically
  is_ssh_running && return 0

  if is_screen_or_tmux_running; then
    if is_tmux_runnning; then
      export DISPLAY="${TMUX}"
    elif is_screen_running; then
      : # For GNU screen
    fi
  else
    if ! is_ssh_running; then
      if ! type tmux &>/dev/null; then
        echo "tmux not found" 1>&2
        return 1
      fi

      if tmux has-session &>/dev/null && tmux list-sessions | grep -qE '.*]$'; then
        # detached session exists
        tmux list-sessions | perl -pe 's/(^.*?):/\033[31m$1:\033[m/'
        printf "tmux: attach? (y/N num/session-name) "
        read
        if [[ ${REPLY} =~ ^[Yy]$ || ${REPLY} == '' ]]; then
          if tmux attach-session; then
            echo "$(tmux -V) attached session"
            return 0
          fi
        elif tmux list-sessions | grep -q "^${REPLY}:"; then
          if tmux attach -t "${REPLY}"; then
            echo "$(tmux -V) attached session"
            return 0
          fi
        fi
      fi

      if type reattach-to-user-namespace &>/dev/null; then
        # on OS X force tmux's default command
        # to spawn a shell in the user's namespace
        tmux_login_shell="${TMUX_SHELL:-/bin/zsh}"
        tmux_config=$(cat ~/.tmux.conf <(echo 'set-option -g default-command "reattach-to-user-namespace -l' ${tmux_login_shell}'"'))
        tmux -f <(echo "${tmux_config}") new-session && echo "$(tmux -V) created new session supported OS X"
      else
        tmux new-session && echo "tmux created new session"
      fi
    fi
  fi
}

main "${@}"