refactor(console-text-color-themes.sh): use Guard Clauses instead…

… of nested `if` 💂

lib/console-text-color-themes.sh

@@ -43,47 +43,48 @@ colorEchoWithoutNewLine() {
   fi
 }
 
-# if not directly run this script(use as lib), just export 2 helper functions, and do NOT print anything.
+# if source this script(use as lib), just export 2 helper functions, and do NOT print anything.
 #
-# if directly run this script, the length of array BASH_SOURCE is 1.
-if ((${#BASH_SOURCE[@]} == 1)); then
-  for style in 0 1 2 3 4 5 6 7; do
-    for fg in 30 31 32 33 34 35 36 37; do
-      for bg in 40 41 42 43 44 45 46 47; do
-        combination="${style};${fg};${bg}"
-        colorEchoWithoutNewLine "$combination" "$combination"
-        printf ' '
-      done
-      echo
+# if directly run this script, the length of array BASH_SOURCE is 1;
+# if source this script, the length of array BASH_SOURCE is grater than 1.
+((${#BASH_SOURCE[@]} == 1)) || return 0
+
+for style in 0 1 2 3 4 5 6 7; do
+  for fg in 30 31 32 33 34 35 36 37; do
+    for bg in 40 41 42 43 44 45 46 47; do
+      combination="${style};${fg};${bg}"
+      colorEchoWithoutNewLine "$combination" "$combination"
+      printf ' '
     done
     echo
   done
+  echo
+done
 
-  echo 'Code sample to print color text:'
+echo 'Code sample to print color text:'
 
-  printf %s '    echo -e "\033['
-  colorEchoWithoutNewLine '3;35;40' '1;36;41'
-  printf %s m
-  colorEchoWithoutNewLine '0;32;40' 'Sample Text'
-  printf '%s\n' '\033[0m"'
+printf %s '    echo -e "\033['
+colorEchoWithoutNewLine '3;35;40' '1;36;41'
+printf %s m
+colorEchoWithoutNewLine '0;32;40' 'Sample Text'
+printf '%s\n' '\033[0m"'
 
-  printf %s "    echo \$'\033["
-  colorEchoWithoutNewLine '3;35;40' '1;36;41'
-  printf %s "m'\""
-  colorEchoWithoutNewLine '0;32;40' 'Sample Text'
-  printf '%s\n' "\"$'\033[0m'"
-  printf '%s\n' "      # NOTE: $'foo' is the escape sequence syntax of bash, safer escape"
+printf %s "    echo \$'\033["
+colorEchoWithoutNewLine '3;35;40' '1;36;41'
+printf %s "m'\""
+colorEchoWithoutNewLine '0;32;40' 'Sample Text'
+printf '%s\n' "\"$'\033[0m'"
+printf '%s\n' "      # NOTE: $'foo' is the escape sequence syntax of bash, safer escape"
 
-  printf '%s\n' 'Output of above code:'
-  printf %s '    '
-  colorEcho '1;36;41' 'Sample Text'
-  echo
-  echo 'If you are going crazy to write text in escapes string like me,'
-  echo 'you can use colorEcho and colorEchoWithoutNewLine function in this script.'
-  echo
-  echo 'Code sample to print color text:'
-  echo '    colorEcho "1;36;41" "Sample Text"'
-  echo 'Output of above code:'
-  echo -n '    '
-  colorEcho '1;36;41' 'Sample Text'
-fi
+printf '%s\n' 'Output of above code:'
+printf %s '    '
+colorEcho '1;36;41' 'Sample Text'
+echo
+echo 'If you are going crazy to write text in escapes string like me,'
+echo 'you can use colorEcho and colorEchoWithoutNewLine function in this script.'
+echo
+echo 'Code sample to print color text:'
+echo '    colorEcho "1;36;41" "Sample Text"'
+echo 'Output of above code:'
+echo -n '    '
+colorEcho '1;36;41' 'Sample Text'