bash banner

bash_banner.sh

#!/bin/bash
#
# An easily-extensible "login banner". Put it in your $PATH and call it from your .bashrc.
# Mainly it shows tmux sessions.
# A "full" view with decorations is given on first run. After that a compact view is
# printed. After an hour has passed the next new terminal will give the full view agian.

columns=$( tput cols )
color1='\033[38;5;036m'
color2='\033[38;5;046m'
reset=`tput op`

figfont=future

function pos
{
    local CURPOS 
    local X 
    local Y
    read -sdR -p $'\E[6n' CURPOS
    CURPOS=${CURPOS#*[}                 # Strip decoration characters <ESC>[
    IFS=';' read -ra X Y <<< "$CURPOS"  # split on the semicolon
    X=$(( X - 1 ))                      # correct position for my uses
    echo "$X $Y"                        # return in a format for use with tput rc
}


AGE=$( date -r "$0" +%s )
NOW=$( date +%s )

#if this file is not at least 600 seconds old, perform terse outpout
if [ $(( NOW - AGE )) -lt 600 ]
then
	tput sc
	echo -en $color1

	tmux ls -F '#{session_name}' | tr -s '\n' ' ' | 
		fold -w 40 -s | sed 's/^/                    /'
	tput rc
	echo -en $color1
        figlet -f $figfont tmux
	tput op
	exit 0
fi

touch "$0"

stripe_left() {
	echo -en $color1
	for x in $(seq 1 $columns ); do echo -n "🭻"; done
	echo
	echo -en $color2
	for x in $(seq 1 $(( columns / 3 ))); do echo -n "🭖🭐 "; done
	echo
	echo -en $color1
	for x in $(seq 1 $columns ); do echo -n "🭶"; done
	echo
}

stripe_right() {
	echo -en $color1
	for x in $(seq 1 $columns ); do echo -n "🭻"; done
	echo
	echo -en $color2
	for x in $(seq 1 $(( columns / 3 ))); do echo -n "🭅🭡 "; done
	echo
	echo -en $color1
	for x in $(seq 1 $columns ); do echo -n "🭶"; done
	echo
}

tput op
stripe_left

if command -v tmux 2>&1 >/dev/null
then
	#extract_current_cursor_position p1
	p1=$(pos)
	tput setaf 2
	tmux ls -F '#{session_name}|#{t:session_created}|#{?session_attached,attached,-}' | column -t -s '|' | sed 's/^/                    /'
	#extract_current_cursor_position p2
	p2=$(pos)
	#tput cup ${p1[0]} ${p1[1]}
	tput cup $p1
	echo -en $color1
        figlet -f $figfont tmux
	#tput cup ${p2[0]} ${p2[1]}
	tput cup $p2
	echo
fi

stripe_right
tput op