tmuxify

.zsh_func_tmux0

#!/bin/zsh
#autoload -U
#vim: set ft=zsh

local use_exec=false
local base=${0##*/}
local sname=${base#tmux}

function err() { print -P >&2 - "%B%F{red}$@" ; }

while [[ "${1:0:1}" == "-" ]] ; do
        case "$1" in
                -h)
                	cat <<-END
			$0 [ --sub | --exec ] [ -l ] [ -s session-name ]
			END
                        return
                        ;;
                --sub)
                        shift
                        use_exec=false
                        ;;
                --exec)
                        shift
                        use_exec=true
                        ;;
                -l)
                        tmux list-sessions
                        return
                        ;;
                -s)
                        shift
                        if [[ -z "$1" ]] ; then
                                err "-t takes a name of the session"
                                return 1
                        fi
                        sname=$1
                        ;;
                *)
                        err "option $1 is not supported"
                        return 1
                        ;;
        esac

done

local existing=$( tmux list-sessions 2>/dev/null | awk -F: '/^'"$sname"'/ { print $1 ; exit }' )
local unatached=$( tmux list-sessions 2>/dev/null | awk -F: '/^'"$sname"'/ && $0 !~ /attached/ { print $1 ; exit }' )

if $use_exec ; then
        if [[ -n "$unatached" ]] ; then
               exec tmux attach-session -t $unatached
        elif [[ -n "$existing" ]] ; then
                exec tmux new -t $existing 2>/dev/null
        fi
        exec tmux new -s $sname

else
        ( [[ -n "$unatached" ]] && tmux attach-session -t $unatached ) \
        || ( [[ -n "$existing" ]] && tmux new -t $existing ) \
        || tmux new -s $sname

fi

.zsh_rc_S01_tmuxify

#!/bin/zsh

if [[ -n "$SSH_CONNECTION" ]] ; then
    if [[ -z "$TMUX" ]] ; then
        if ( whence tmux >/dev/null 2>&1 ) ; then
            # ~/.zsh/func/tmux0
            autoload -U tmux0
            exec tmux0 --exec
            exec tmux0
        fi
    fi
fi

README.md

This gist causes automatic connection to a running tmux session. On first connection a tmux session is created.

There are two parts:

1. .zsh/rc/S01_tmuxify - this file is sourced as part of .zshrc (in my setup)
2. .zsh/func/tmux0 - this is a zsh function that makes sure a tmux session is available and attaches to it

Here is the bash to do "tmuxify"

#!/bin/bash

if [ "$PS1" ] ; then

tmux0() {
        local existing=$( tmux list-sessions 2>/dev/null | awk -F: '{ print $1 ; exit }' )
        local unatached=$( tmux list-sessions 2>/dev/null | awk -F: '$0 !~ /attached/ { print $1 ; exit }' )

        if [[ "$1" = "--exec" ]] ; then
                if [[ -n "$unatached" ]] ; then
                        exec tmux attach-session -t $unatached
                elif [[ -n "$existing" ]] ; then
                        exec tmux new -t $existing 2>/dev/null
                fi
                exec tmux new
        else
                ( [[ -n "$unatached" ]] && tmux attach-session -t $unatached ) \
                        || ( [[ -n "$existing" ]] && tmux new -t $existing ) \
                        || tmux new
        fi
}

if [ -n "$SSH_CONNECTION" ] ; then
        if [ -z "$TMUX" ] ; then
                if ( which tmux >/dev/null 2>&1 ) ; then
                        tmux0 --exec
                        tmux0
                fi
        fi
fi

fi