Grub theme : ⬆️ install.sh update and README file

Features : 🚸
	   + adding terminal user interface for better use
	   + persited exectution of the script as root
	   + adding color syntax information

README.md

@@ -1,11 +1,19 @@
+```
+  ____ ____  _   _ ____ ____    _____ _   _ _____ __  __ _____ ____  
+ / ___|  _ \| | | | __ )___ \  |_   _| | | | ____|  \/  | ____/ ___| 
+| |  _| |_) | | | |  _ \ __) |   | | | |_| |  _| | |\/| |  _| \___ \ 
+| |_| |  _ <| |_| | |_) / __/    | | |  _  | |___| |  | | |___ ___) |
+ \____|_| \_\\___/|____/_____|   |_| |_| |_|_____|_|  |_|_____|____/ 
+                                                                     
 
-## Grub2 Themes
+``` 
 
-Flat Design themes for Grub2.
+##Flat Design themes for Grub2.
 
 ## Install
-
+ 
-Usage:  `sudo ./install.sh`  **[OPTIONS...]**
+Usage:  `sudo ./install.sh`  **[OPTIONS...]** 
+*if no option used the terminal user interface will be show up* 
 
 |  OPTIONS:      | |
 |:---------------|:-------------|

install.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
-# Grub2 Dark Theme
+# Grub2 Dark Theme 
+
 
 ROOT_UID=0
 THEME_DIR="/boot/grub/themes"
@@ -8,13 +9,56 @@ THEME_DIR_2="/boot/grub2/themes"
 
 REO_DIR=$(cd $(dirname $0) && pwd)
 
+MAX_DELAY=20                                        # max delay for user to enter root password 
+
+#COLORS  
+CDEF=" \033[0m"                                     # default color 
+CCIN=" \033[0;36m"                                  # info color 
+CGSC=" \033[0;32m"                                  # success color 
+CRER=" \033[0;31m"                                  # error color 
+CWAR=" \033[0;33m"                                  # waring color 
+b_CDEF=" \033[1;37m"                                # bold default color 
+b_CCIN=" \033[1;36m"                                # bold info color 
+b_CGSC=" \033[1;32m"                                # bold success color 
+b_CRER=" \033[1;31m"                                # bold error color
+b_CWAR=" \033[1;33m"                                # bold warning color 
+
+# echo like ...  with  flag type  and display message  colors  
+prompt () {                                         
+    case ${1} in
+        "-s"|"--success")
+            echo -e "${b_CGSC}${@/-s/}${CDEF}";;    # print success message 
+        "-e"|"--error")  
+            echo -e "${b_CRER}${@/-e/}${CDEF}";;    # print error message 
+        "-w"|"--warning")  
+            echo -e "${b_CWAR}${@/-w/}${CDEF}";;    # print warning message 
+        "-i"|"--info")
+            echo -e "${b_CCIN}${@/-i/}${CDEF}";;    # print info message 
+        *)
+            echo -e "$@"
+            ;; 
+    esac 
+}
+
+
+#  print "GRUB THEME"   whene the script is launched                             
+ascii_art_header ()  { 
+    [[ -f README.md ]] && {             
+        header_title=$(sed -n 2,8p README.md) 
+        prompt -i "$header_title" 
+    }     
+} 
+#ascii_art_header                                    # uncomment this line to show Grub theme ascii art 
+
+
 # Check command avalibility
 function has_command() {
   command -v $1 > /dev/null
 }
 
+
 usage() {
-  printf "%s\n" "Usage: $0 [OPTIONS...]"
+  printf "%s\n" "Usage: ${0##*/} [OPTIONS...]"
   printf "\n%s\n" "OPTIONS:"
   printf "  %-25s%s\n" "-l, --slaze" "slaze grub theme"
   printf "  %-25s%s\n" "-s, --stylish" "stylish grub theme"
@@ -24,6 +68,7 @@ usage() {
 }
 
 install() {
+
   if [[ ${theme} == 'slaze' ]]; then
     local name="Slaze"
   elif [[ ${theme} == 'stylish' ]]; then
@@ -35,8 +80,9 @@ install() {
   else
     echo -e "\n Please run ./install.sh with option, run ./install.sh -h for help!"
     exit 0
-  fi
+  fi 
-
+    
+ 
   # Checking for root access and proceed if it is present
   if [ "$UID" -eq "$ROOT_UID" ]; then
 
@@ -48,7 +94,7 @@ install() {
     [[ -d /boot/grub2 ]] && mkdir -p ${THEME_DIR_2}/${name}
 
     # Copy theme
-    echo -e "\n Installing ${name} theme..."
+    prompt -i "Installing ${name} theme..."
 
     if [ -d /boot/grub ]; then
       cp -a ${REO_DIR}/common/* ${THEME_DIR}/${name}
@@ -77,16 +123,16 @@ install() {
     fi
 
     # Set theme
-    echo -e "\n Setting ${name} as default..."
+    prompt -i "Setting ${name} as default..."
     grep "GRUB_THEME=" /etc/default/grub 2>&1 >/dev/null && sed -i '/GRUB_THEME=/d' /etc/default/grub
 
     [[ -d /boot/grub ]] && echo "GRUB_THEME=\"${THEME_DIR}/${name}/theme.txt\"" >> /etc/default/grub
     [[ -d /boot/grub2 ]] && echo "GRUB_THEME=\"${THEME_DIR_2}/${name}/theme.txt\"" >> /etc/default/grub
 
     # Update grub config
-    echo -e "\n Updating grub config..."
+    prompt -i "Updating grub config..."
     if has_command update-grub; then
-      update-grub
+        update-grub 
     elif has_command grub-mkconfig; then
       grub-mkconfig -o /boot/grub/grub.cfg
     elif has_command grub2-mkconfig; then
@@ -94,42 +140,69 @@ install() {
     fi
 
     # Success message
-    echo -e "\n All done! "
+    prompt -s "All done!"
 
   else
     # Error message
-    echo -e "\n Error! -> Run me as root "
+    prompt -e "\n[ E r r o r ] -> Run me as root "
+    
+    # persisted execution of the script as root 
+    read -p "[ trusted ] specify the root password : " -t${MAX_DELAY} -s 
+    [[ -n "$REPLY" ]]&& { 
+        if  [[  -n  "${theme}" ]]  ; then 
+            sudo -S <<< $REPLY $0 --${theme} 
+        fi 
+    }|| {
+       prompt  "\n Operation canceled  Bye" 
+       exit 1 
+    }
   fi
 }
 
-while [[ $# -gt 0 ]]; do
+# show terminal user interface for better use 
-  case "${1}" in
+if [[ $# -lt 1 ]]  ;then 
-    -l|--slaze)
+    if [[ -x /usr/bin/dialog ]] ; then 
-      theme='slaze'
+        tui=$(dialog --backtitle "Grub 2 Themes" \
-      shift 1
+      --radiolist "Choose your Grub theme : " 15 40 5 \
-      ;;
+     1 "Slaze Theme" off  \
-    -s|--stylish)
+     2 "Stylish Theme" on \
-      theme='stylish'
+     3 "Tela Theme" off  \
-      shift 1
+     4 "Vimix Theme" off --output-fd 1 ) 
-      ;;
+   case "$tui" in
-    -t|--tela)
+       1) theme="slaze"     ;; 
-      theme='tela'
+       2) theme="stylish"   ;;
-      shift 1
+       3) theme="tela"      ;; 
-      ;;
+       4) theme="vimix"     ;; 
-    -v|--vimix)
+       *) prompt "Canceled" ;; 
-      theme='vimix'
+    esac 
-      shift 1
+
-      ;;
+    fi 
-    -h|--help)
+fi  
-      usage
+while [[ $# -ge 1 ]]; do
-      exit 0
+    case "${1}" in
-      ;;
+        -l|--slaze)
-    *)
+            theme='slaze'
-      echo "ERROR: Unrecognized installation option '$1'."
+            ;;
-      echo "Try '$0 --help' for more information."
+        -s|--stylish)
-      exit 1
+            theme='stylish'
-      ;;
+            ;;
-  esac
+        -t|--tela)
+            theme='tela'
+            ;;
+        -v|--vimix)
+            theme='vimix'
+            ;;
+        -h|--help)
+            usage
+            exit 0
+            ;;
+        *)
+            prompt  -e "ERROR: Unrecognized installation option '$1'."
+            prompt  -i "Try '$0 --help' for more information."
+            exit 1
+            ;;
+    esac 
+    shift  
 done
 
 install