sdk/dart now detects an available build

sdk/bin/dart

 #!/bin/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.
 
 function follow_links() {
   file="$1"
   while [ -h "$file" ]; do
     # On Mac OS, readlink -f doesn't work.
     file="$(readlink "$file")"
   done
   echo "$file"
 }
 
 # Unlike $0, $BASH_SOURCE points to the absolute path of this file.
 PROG_NAME="$(follow_links "$BASH_SOURCE")"
 
 # Handle the case where dart-sdk/bin has been symlinked to.
 CUR_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
 
 if [ -z "$DART_CONFIGURATION" ];
 then
-  DART_CONFIGURATION="ReleaseIA32"
+  CONFIGS=$( ls "$CUR_DIR"/../../out/ )

[floitsch, 2015/08/10 11:48:40]

This only works for Linux.

Create a OUT_DIR variable.

if [[ `uname` == 'Darwin' ]];
then
  OUT_DIR="$CUR_DIR"/../../xcodebuild"
else
  OUT_DIR="$CUR_DIR"/../../out"
fi

if [ -z "$DART_CONFIGURATION" ];
...
fi

BIN_DIR="$OUT_DIR"/$DART_CONFIGURATION

[stanm, 2015/08/10 14:51:40]

Acknowledged.

+  COUNT=$( echo $CONFIGS | wc -w )
+  if [ "$COUNT" -eq "0" ];
+  then
+    # keep original behaviour in the case of an empty "out" folder
+    DART_CONFIGURATION="ReleaseIA32"
+  else
+    # if there is a "ReleaseIA32" folder - use it, otherwise - use the last one
+    # lexicographically

[floitsch, 2015/08/10 11:48:40]

I think it would be nicer to have a list of preferred configurations.
This makes it also more robust wrt to spurious folders/files in the
out-directory.

[stanm, 2015/08/10 14:51:40]

I thought of doing that initially, but I couldn't find a list of the available
options. I will look into it now.

[floitsch, 2015/08/10 14:56:09]

I wouldn't look too far.
I32 und I64 Release and Debug are probably enough.

[floitsch, 2015/08/10 14:56:49]

You could furthermore include ARM (don't know what the id is). that should make
it pretty complete.

+    for CONFIG in $CONFIGS;
+    do
+      DART_CONFIGURATION="$CONFIG"
+      if [ "$CONFIG" = "ReleaseIA32" ];
+      then
+        break
+      fi
+    done
+  fi
 fi
 
 if [[ `uname` == 'Darwin' ]];
 then
   BIN_DIR="$CUR_DIR"/../../xcodebuild/$DART_CONFIGURATION
 else
   BIN_DIR="$CUR_DIR"/../../out/$DART_CONFIGURATION
 fi
 
 exec "$BIN_DIR"/dart "$@"