Add quiet flag and produce default output

configure.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+# Constants
+
 # port of the server in standalone mode, aka the open port
 STANDALONE_PORT=25565
 # port of the server in proxy mode, aka the internal port
@@ -18,6 +20,11 @@ VIA_VERSION_REPO="ViaVersion/ViaVersion"
 # Github repo of ViaBackwards project
 VIA_BACKWARDS_REPO="ViaVersion/ViaBackwards"
 
+# Runtime variables
+
+quiet=false
+
+
 function main {
 
   # parse arguments
@@ -32,33 +39,33 @@ function main {
       "velocity")
         velocity=true
         if $bungeecord || $standalone; then
-          echo "argument velocity can't be used together with bungeecord or standalone"
-          exit 1
+          err "argument velocity can't be used together with bungeecord or standalone"
         fi
         ;;
       "bungeecord")
         bungeecord=true
         if $velocity || $standalone; then
-          echo "argument bungeecord can't be used together with velocity or standalone"
-          exit 1
+          err "argument bungeecord can't be used together with velocity or standalone"
         fi
         ;;
       "standalone")
         standalone=true
         if $bungeecord || $velocity; then
-          echo "argument standalone can't be used together with bungeecord or velocity"
-          exit 1
+          err "argument standalone can't be used together with bungeecord or velocity"
         fi
         ;;
       "--fetch")
         fetch=true
+        quiet=true
+        ;;
+      "--quiet" | "-q")
+        quiet=true
         ;;
       "--help")
         help=true
         ;;
       *)
-        echo "Unknown argument: $arg"
-        exit 1
+        err "Unknown argument: $arg"
         ;;
     esac
   done
@@ -76,6 +83,7 @@ function main {
     echo "OPTIONS:"
     echo "  --fetch - print the current mode before reconfiguring the server. Nothing else will be printed."
     echo "  --help - show this message"
+    echo "  -q --quiet - Dont print any output, except for output which is caused by --fetch"
     exit 0
   fi
 
@@ -187,7 +195,19 @@ function download_jar_from_github {
   local repo=$1
   local dst=$2
   local url=$(curl -s "https://api.github.com/repos/$repo/releases/latest" | jq -r '.assets[] | select(.name | endswith(".jar")) | .browser_download_url')
+  if $quiet; then
     wget -qP "$dst" "$url"
+  else
+    wget -P "$dst" "$url"
+  fi
+}
+
+# Shows ans error message and exits the program with code 1
+#
+# Usage: err <msg>
+function err {
+  echo "$1"
+  exit 1
 }
 
 main "$@"