update: display logo in rainbow colors (#8941)

tools/upgrade.sh

-
 # Use colors, but only if connected to a terminal, and that terminal
 # supports them.
 if [ -t 1 ]; then
+  RB_RED=$(printf '\033[38;5;196m')
+  RB_ORANGE=$(printf '\033[38;5;202m')
+  RB_YELLOW=$(printf '\033[38;5;226m')
+  RB_GREEN=$(printf '\033[38;5;082m')
+  RB_BLUE=$(printf '\033[38;5;021m')
+  RB_INDIGO=$(printf '\033[38;5;093m')
+  RB_VIOLET=$(printf '\033[38;5;163m')
+
   RED=$(printf '\033[31m')
   GREEN=$(printf '\033[32m')
   YELLOW=$(printf '\033[33m')
@@ -9,6 +16,14 @@ if [ -t 1 ]; then
   BOLD=$(printf '\033[1m')
   RESET=$(printf '\033[m')
 else
+  RB_RED=""
+  RB_ORANGE=""
+  RB_YELLOW=""
+  RB_GREEN=""
+  RB_BLUE=""
+  RB_INDIGO=""
+  RB_VIOLET=""
+
   RED=""
   GREEN=""
   YELLOW=""
@@ -40,13 +55,12 @@ fi
 printf "${BLUE}%s${NORMAL}\n" "Updating Oh My Zsh"
 if git pull --rebase --stat origin master
 then
-  printf '%s' "$GREEN"
-  printf '%s\n' '         __                                     __   '
-  printf '%s\n' '  ____  / /_     ____ ___  __  __   ____  _____/ /_  '
-  printf '%s\n' ' / __ \/ __ \   / __ `__ \/ / / /  /_  / / ___/ __ \ '
-  printf '%s\n' '/ /_/ / / / /  / / / / / / /_/ /    / /_(__  ) / / / '
-  printf '%s\n' '\____/_/ /_/  /_/ /_/ /_/\__, /    /___/____/_/ /_/  '
-  printf '%s\n' '                        /____/                       '
+  printf '%s         %s__      %s           %s        %s       %s     %s__   %s\n' $RB_RED $RB_ORANGE $RB_YELLOW $RB_GREEN $RB_BLUE $RB_INDIGO $RB_VIOLET $RB_RESET
+  printf '%s  ____  %s/ /_    %s ____ ___  %s__  __  %s ____  %s_____%s/ /_  %s\n' $RB_RED $RB_ORANGE $RB_YELLOW $RB_GREEN $RB_BLUE $RB_INDIGO $RB_VIOLET $RB_RESET
+  printf '%s / __ \%s/ __ \  %s / __ `__ \%s/ / / / %s /_  / %s/ ___/%s __ \ %s\n' $RB_RED $RB_ORANGE $RB_YELLOW $RB_GREEN $RB_BLUE $RB_INDIGO $RB_VIOLET $RB_RESET
+  printf '%s/ /_/ /%s / / / %s / / / / / /%s /_/ / %s   / /_%s(__  )%s / / / %s\n' $RB_RED $RB_ORANGE $RB_YELLOW $RB_GREEN $RB_BLUE $RB_INDIGO $RB_VIOLET $RB_RESET
+  printf '%s\____/%s_/ /_/ %s /_/ /_/ /_/%s\__, / %s   /___/%s____/%s_/ /_/  %s\n' $RB_RED $RB_ORANGE $RB_YELLOW $RB_GREEN $RB_BLUE $RB_INDIGO $RB_VIOLET $RB_RESET
+  printf '%s    %s        %s           %s /____/ %s       %s     %s          %s\n' $RB_RED $RB_ORANGE $RB_YELLOW $RB_GREEN $RB_BLUE $RB_INDIGO $RB_VIOLET $RB_RESET
   printf "${BLUE}%s\n" "Hooray! Oh My Zsh has been updated and/or is at the current version."
   printf "${BLUE}${BOLD}%s${RESET}\n" "To keep up on the latest news and updates, follow us on twitter: https://twitter.com/ohmyzsh"
   printf "${BLUE}${BOLD}%s${RESET}\n" "Get your Oh My Zsh swag at: https://shop.planetargon.com/collections/oh-my-zsh"