Merge pull request #217 from dkim/sbt-create

Exit if the current dir is definitely not an sbt dir and neither `-sbt-create` nor `new` was given

src/universal/bin/sbt

@@ -127,12 +127,31 @@ process_my_args () {
 
     -sbt-create) sbt_create=true && shift ;;
 
+            new) sbt_new=true && addResidual "$1" && shift ;;
+
               *) addResidual "$1" && shift ;;
     esac
   done
   
   # Now, ensure sbt version is used.
   [[ "${sbt_version}XXX" != "XXX" ]] && addJava "-Dsbt.version=$sbt_version" 
+
+  # Confirm a user's intent if the current directory does not look like an sbt
+  # top-level directory and neither the -sbt-create option nor the "new"
+  # command was given.
+  [[ -f ./build.sbt || -d ./project || -n "$sbt_create" || -n "$sbt_new" ]] || {
+    echo "[warn] Neither build.sbt nor a 'project' directory in the current directory: $(pwd)"
+    while true; do
+      echo 'c) continue'
+      echo 'q) quit'
+
+      read -p '? ' || exit 1
+      case "$REPLY" in
+        c|C) break ;;
+        q|Q) exit 1 ;;
+      esac
+    done
+  }
 }
 
 loadConfigFile() {

src/universal/bin/sbt.bat

@@ -68,6 +68,9 @@ if "%~1" == "-jvm-debug" (
   if not "%~1" == "!JVM_DEBUG_PORT!" (
     set SBT_ARGS=!SBT_ARGS! %1
   )
+) else if /I "%~1" == "new" (
+  set sbt_new=true
+  set SBT_ARGS=!SBT_ARGS! %1
 ) else (
   set SBT_ARGS=!SBT_ARGS! %1
 )
@@ -76,6 +79,31 @@ shift
 goto args_loop
 :args_end
 
+rem Confirm a user's intent if the current directory does not look like an sbt
+rem top-level directory and the "new" command was not given.
+if not exist build.sbt (
+  if not exist project\ (
+    if not defined sbt_new (
+      echo [warn] Neither build.sbt nor a 'project' directory in the current directory: %CD%
+      setlocal
+:confirm
+      echo c^) continue
+      echo q^) quit
+
+      set /P reply=?^ 
+      if /I "!reply!" == "c" (
+        goto confirm_end
+      ) else if /I "!reply!" == "q" (
+        exit /B 1
+      )
+
+      goto confirm
+:confirm_end
+      endlocal
+    )
+  )
+)
+
 if defined JVM_DEBUG_PORT (
   set _JAVA_OPTS=!_JAVA_OPTS! -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=!JVM_DEBUG_PORT!
 )