#!/bin/sh
# motd-assist :: brand-header — Rahmen-Header mit Hostname und Betriebssystem
set -u

E=$(printf '\033')
BLUE="${E}[1;38;5;75m"
ORANGE="${E}[1;38;5;214m"
DIM="${E}[2m"
BOLD="${E}[1m"
R="${E}[0m"

HOST=$(hostname 2>/dev/null || echo localhost)
HOST=${HOST%%.*}

OS=Linux
if [ -r /etc/os-release ]; then
	. /etc/os-release
	OS=${PRETTY_NAME:-Linux}
fi

W=${COLUMNS:-72}
case $W in ''|*[!0-9]*) W=72 ;; esac
[ "$W" -gt 78 ] && W=78
[ "$W" -lt 44 ] && W=44

INNER=$((W - 2))
PLAIN=" ${HOST} - ${OS} "
PAD=$((INNER - ${#PLAIN}))
[ "$PAD" -lt 0 ] && PAD=0

RULE=$(awk -v n="$INNER" 'BEGIN{s="";for(i=0;i<n;i++)s=s "─";printf "%s",s}')
SPACES=$(printf '%*s' "$PAD" '')

printf '%b\n' "$BLUE╭$R$DIM$RULE$R$BLUE╮$R"
printf '%b\n' "$BLUE│$R $BOLD$BLUE$HOST$R $DIM·$R $ORANGE$OS$R$SPACES $BLUE│$R"
printf '%b\n' "$BLUE╰$R$DIM$RULE$R$BLUE╯$R"