Copy Dart-configuration detection from dart script to pub.

sdk/bin/pub

 #!/usr/bin/env bash
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Run pub.dart on the Dart VM. This script is only used when running pub from
 # within the Dart source repo. The shipped SDK instead uses "pub_sdk", which is
 # renamed to "pub" when the SDK is built.
 
 function follow_links() {
@@ skipping 11 matching lines @@
 # Handle the case where dart-sdk/bin has been symlinked to.
 BIN_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
 
 SDK_DIR="$(cd "${BIN_DIR}/.." ; pwd -P)"
 
 SNAPSHOT="$BIN_DIR/snapshots/pub.dart.snapshot"
 
 unset VM_OPTIONS
 declare -a VM_OPTIONS
 
+if [[ `uname` == 'Darwin' ]];
+then
+  OUT_DIR="$BIN_DIR"/../../xcodebuild/
+else
+  OUT_DIR="$BIN_DIR"/../../out/
+fi
+
 # Allow extra VM options to be passed in through an environment variable.
 if [[ $DART_VM_OPTIONS ]]; then
   read -a OPTIONS <<< "$DART_VM_OPTIONS"
   VM_OPTIONS+=("${OPTIONS[@]}")
 fi
 
 if [ -z "$DART_CONFIGURATION" ];
 then
-  DART_CONFIGURATION="ReleaseX64"
+  DIRS=$( ls "$OUT_DIR" )
+  # list of possible configurations in decreasing desirability
+  CONFIGS=("ReleaseX64" "ReleaseIA32" "DebugX64" "DebugIA32"
+    "ReleaseARM"    "ReleaseARM64"    "ReleaseARMV5TE"    "ReleaseMIPS"
+    "DebugARM"      "DebugARM64"      "DebugARMV5TE"      "DebugMIPS")
+  DART_CONFIGURATION="None"
+  for CONFIG in ${CONFIGS[*]}
+  do
+    for DIR in $DIRS;
+    do
+      if [ "$CONFIG" = "$DIR" ];
+      then
+        # choose most desirable configuration that is available and break
+        DART_CONFIGURATION="$DIR"
+        break 2
+      fi
+    done
+  done
+  if [ "$DART_CONFIGURATION" = "None" ]
+  then
+    echo "No valid dart configuration found in $OUT_DIR"
+    exit 1
+  fi
 fi
 
 if [[ `uname` == 'Darwin' ]];
 then
   BUILD_DIR="$SDK_DIR/../xcodebuild/$DART_CONFIGURATION"
 else
   BUILD_DIR="$SDK_DIR/../out/$DART_CONFIGURATION"
 fi
 
 # Use the Dart binary in the built SDK so pub can find the version file next
 # to it.
 DART="$BUILD_DIR/dart-sdk/bin/dart"
 PACKAGES_DIR="$BUILD_DIR/packages/"
 
 # Run pub.
 PUB="$SDK_DIR/../third_party/pkg/pub/bin/pub.dart"
 exec "$DART" "${VM_OPTIONS[@]}" "--package-root=$PACKAGES_DIR" "$PUB" "$@"