160 lines
4.8 KiB
Bash
160 lines
4.8 KiB
Bash
#!/usr/bin/env zsh
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# ============================================================================
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# MOTD (Message of the Day) - Dynamic System Info
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# ============================================================================
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# Displays system information on shell startup
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#
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# Functions:
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# show_motd - Compact box format
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# show_motd_mini - Single line format
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# ============================================================================
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# Only run in interactive shells
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[[ -o interactive ]] || return 0
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#
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# ============================================================================
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# MOTD Width, adjust if needed.
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# ============================================================================
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_M_WIDTH=64
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# ============================================================================
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# Colors (ANSI escape codes)
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# ============================================================================
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_M_RESET=$'\033[0m'
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_M_BOLD=$'\033[1m'
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_M_DIM=$'\033[2m'
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_M_BLUE=$'\033[38;5;39m'
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_M_CYAN=$'\033[38;5;51m'
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_M_GREEN=$'\033[38;5;82m'
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_M_YELLOW=$'\033[38;5;220m'
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_M_GREY=$'\033[38;5;242m'
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# ============================================================================
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# Info Gathering
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# ============================================================================
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_motd_uptime() {
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local up=$(uptime 2>/dev/null)
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if [[ "$up" =~ "up "([^,]+) ]]; then
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echo "${match[1]}" | sed 's/^ *//'
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else
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echo "?"
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fi
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}
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_motd_load() {
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if [[ -f /proc/loadavg ]]; then
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awk '{print $1}' /proc/loadavg
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else
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uptime | awk -F'load average:' '{print $2}' | awk -F, '{print $1}' | xargs
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fi
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}
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_motd_mem() {
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free -h 2>/dev/null | awk '/^Mem:/ {print $3 "/" $2}' || echo "N/A"
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}
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_motd_disk() {
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df -h / 2>/dev/null | awk 'NR==2 {print $3 "/" $4}' || echo "N/A"
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}
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# ============================================================================
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# Box Drawing - Fixed Width
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# ============================================================================
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_motd_line() {
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local char="$1"
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local i
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local line=""
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for ((i=0; i<_M_WIDTH; i++)); do
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line+="$char"
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done
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echo "$line"
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}
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_motd_pad() {
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# Pad a plain string to exact width
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local str="$1"
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local width="$2"
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local len=${#str}
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if (( len >= width )); then
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echo "${str:0:$width}"
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else
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printf "%-${width}s" "$str"
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fi
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}
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# ============================================================================
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# Main Display Function
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# ============================================================================
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show_motd() {
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[[ -n "$_MOTD_SHOWN" && "$1" != "--force" ]] && return 0
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typeset -g _MOTD_SHOWN=1
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local hostname="${HOST:-$(hostname -s 2>/dev/null)}"
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local datetime=$(date '+%a %b %d %H:%M')
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local uptime=$(_motd_uptime)
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local load=$(_motd_load)
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local mem=$(_motd_mem)
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local disk=$(_motd_disk)
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local local_ip=$(hostname -i | awk -F" " '{print $1}')
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local hline=$(_motd_line '═')
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local inner=$((_M_WIDTH - 2))
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echo ""
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# Top border
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echo "${_M_GREY}╒${hline}╕${_M_RESET}"
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# Header: hostname + datetime
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local h_left="✦ ${hostname}"
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local h_center="${local_ip}"
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local h_right="${datetime}"
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local h_pad=$(((inner - ${#h_left} - ${#h_center} - ${#h_right}) / 2 ))
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local h_spaces=""
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for ((i=0; i<h_pad; i++)); do h_spaces+=" "; done
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echo "${_M_GREY}│${_M_RESET} ${_M_BOLD}${_M_BLUE}${h_left}${_M_RESET}${h_spaces}${_M_DIM}${h_center}${h_spaces}${h_right}${_M_RESET}${_M_GREY} │${_M_RESET}"
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# Separator
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echo "${_M_GREY}╘${hline}╛${_M_RESET}"
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# Stats line - build with exact spacing
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local s1="${_M_YELLOW}▲ up:${_M_RESET}${uptime}"
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local s2="${_M_CYAN}◆ load:${_M_RESET}${load}"
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local s3="${_M_GREEN}◇ mem:${_M_RESET}${mem}"
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local s4="${_M_BLUE}⊡${_M_RESET} ${disk}"
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echo "${_M_GREY} ${_M_RESET}${s1}${_M_DIM} ${s2}${_M_DIM} ${s3}${_M_DIM} ${s4}${_M_DIM}${_M_GREY} ${_M_RESET}"
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## Bottom border
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#echo "${_M_GREY}╘${hline}${_M_RESET}"
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echo ""
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}
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# ============================================================================
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# Mini Format (Single Line)
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# ============================================================================
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show_motd_mini() {
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[[ -n "$_MOTD_SHOWN" && "$1" != "--force" ]] && return 0
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typeset -g _MOTD_SHOWN=1
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local hostname="${HOST:-$(hostname -s 2>/dev/null)}"
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local uptime=$(_motd_uptime)
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local mem=$(_motd_mem)
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echo "${_M_DIM}──${_M_RESET} ${_M_BOLD}${hostname}${_M_RESET} ${_M_DIM}│${_M_RESET} up:${uptime} ${_M_DIM}│${_M_RESET} mem:${mem} ${_M_DIM}──${_M_RESET}"
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}
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# ============================================================================
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# Aliases
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# ============================================================================
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alias motd='show_motd --force'
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alias motd-mini='show_motd_mini --force'
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