add --no-modify-config flag to install.sh

install.sh

@@ -9,6 +9,7 @@ function show_usage() {
   echo "--help (-h): Display this help message"
   echo "--silent (-s): Install default settings without prompting for input";
   echo "--interactive (-i): Interactively choose plugins"
+  echo "--no-modify-config (-n): Do not modify existing config file"
   exit 0;
 }
 
@@ -67,17 +68,19 @@ for param in "$@"; do
     "--help")               set -- "$@" "-h" ;;
     "--silent")             set -- "$@" "-s" ;;
     "--interactive")        set -- "$@" "-i" ;;
+    "--no-modify-config")   set -- "$@" "-n" ;;
     *)                      set -- "$@" "$param"
   esac
 done
 
 OPTIND=1
-while getopts "hsi" opt
+while getopts "hsin" opt
 do
   case "$opt" in
   "h") show_usage; exit 0 ;;
   "s") silent=true ;;
   "i") interactive=true ;;
+  "n") no_modify_config=true ;;
   "?") show_usage >&2; exit 1 ;;
   esac
 done
@@ -101,6 +104,7 @@ esac
 
 BACKUP_FILE=$CONFIG_FILE.bak
 echo "Installing bash-it"
+if ! [[ $silent ]] && ! [[ $no_modify_config ]]; then
   if [ -e "$HOME/$BACKUP_FILE" ]; then
     echo -e "\033[0;33mBackup file already exists. Make sure to backup your .bashrc before running this installation.\033[0m" >&2
     while ! [ $silent ];  do
@@ -141,8 +145,7 @@ while ! [ $silent ]; do
       ;;
     esac
   done
-
-if [ $silent ]; then
+elif [[ $silent ]] && ! [[ $no_modify_config ]]; then
   # backup/new by default
   backup_new
 fi