fetch_pretty.sh

#!/bin/bash

# Get the operating system name and version
os=$(lsb_release -ds)

# Get the kernel version
kv=$(uname -r)

# Get the name of the current shell
sh=${SHELL##*/}

# Initialize the user interface variable to 'unknown'
ui='unknown'

# Determine the user interface (desktop environment or window manager)
if [ -n "${DE}" ]; then
  ui="${DE}" # If DE variable is set, use it
elif [ -n "${WM}" ]; then
  ui="${WM}" # If WM variable is set, use it
elif [ -n "${XDG_CURRENT_DESKTOP}" ]; then
  ui="${XDG_CURRENT_DESKTOP}" # Use XDG_CURRENT_DESKTOP if set
elif [ -n "${DESKTOP_SESSION}" ]; then
  ui="${DESKTOP_SESSION}" # Use DESKTOP_SESSION if set
elif [ -n "${rcwm}" ]; then
  ui="${rcwm}" # Use rcwm if set
elif [ -n "${XDG_SESSION_TYPE}" ]; then
  ui="${XDG_SESSION_TYPE}" # Use XDG_SESSION_TYPE if set
fi

# Get the base name of the user interface variable
ui="$(basename "${ui}")"

# Function to set text color based on input argument
color() {
  case "$1" in
  red) printf '\033[1;31m' ;;     # Set color to red
  green) printf '\033[1;32m' ;;   # Set color to green
  yellow) printf '\033[1;33m' ;;  # Set color to yellow
  blue) printf '\033[1;34m' ;;    # Set color to blue
  magenta) printf '\033[1;35m' ;; # Set color to magenta
  cyan) printf '\033[1;36m' ;;    # Set color to cyan
  gray) printf '\033[1;30m' ;;    # Set color to gray
  white) printf '\033[1;37m' ;;   # Set color to white
  reset) printf '\033[0m' ;;      # Reset color to default
  esac
}

# Initialize output variable with a newline
output="\n"

# Append formatted OS information to output
output+=$(printf "%b" "$(color red)  os  -  $(color reset)$os\n")"\n"
# Append formatted kernel version to output
output+=$(printf "%b" "$(color yellow)  kr  -  $(color reset)$kv\n")"\n"
# Append formatted shell information to output
output+=$(printf "%b" "$(color green)  sh  -  $(color reset)$sh\n")"\n"
# Append formatted window manager information to output
output+=$(printf "%b" "$(color blue)  wm  -  $(color reset)$ui\n")"\n\n"

# Convert output to lowercase efficiently
output=$(tr '[:upper:]' '[:lower:]' <<< "$output")

# Print the final output
printf "%b" "$output"

# Print a modern, colorful bar using solid block characters (optimized)
for color in red green yellow blue magenta cyan gray white; do
  printf "%s\u2588\u2588 %s" "$(color "$color")" "$(color reset)"
done
printf "\n"