bin/buck

#!/bin/bash

# Exit on error.
set -e


# Record the directory from which this script was run in case
# we need to re-run it as part of the autoupdate.
ORIGINAL_WORKING_DIRECTORY="$PWD"

# $BUCK_BIN_DIRECTORY is the directory that hosts this script. Solution taken from:
# http://stackoverflow.com/questions/59895/can-a-bash-script-tell-what-directory-its-stored-in
SOURCE="${BASH_SOURCE[0]}"
DIR="$( dirname "$SOURCE" )"
while [ -h "$SOURCE" ]
do 
  SOURCE="$(readlink "$SOURCE")"
  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE"
  DIR="$( cd -P "$( dirname "$SOURCE"  )" && pwd )"
done
DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
BUCK_BIN_DIRECTORY=$DIR

# Keep track of the project root directory.
PROJECT_ROOT="$PWD"

# Navigate to the root of the Buck project.
pushd $BUCK_BIN_DIRECTORY > /dev/null
pushd .. > /dev/null
BUCK_DIRECTORY="$PWD"

# If there is a .buckversion file in the project root, then make sure that Buck is at that version.
# The only way to override this is to include a .nobuckcheck file in the project root.
if [ -e "${PROJECT_ROOT}/.buckversion" ] && [ ! -e "${PROJECT_ROOT}/.nobuckcheck" ]; then
  BUCK_REQUIRED_VERSION=`cat ${PROJECT_ROOT}/.buckversion`

  # If the hash is in not in the user's repository, do a `git fetch`.
  if ! git cat-file -e "$BUCK_REQUIRED_VERSION"; then
    git fetch
  fi


  BUCK_CURRENT_VERSION=`git rev-parse HEAD`
  
  # Note that this test succeeds if you have local changes in your Buck repository that have not
  # been committed.
  if [ "$BUCK_REQUIRED_VERSION" != "$BUCK_CURRENT_VERSION" ]; then
    echo "Buck is at ${BUCK_CURRENT_VERSION},"
    echo "but should be ${BUCK_REQUIRED_VERSION}."
    echo "Buck is updating itself."
    echo "To disable this, add a '.nobuckcheck' file to your project root."
    echo "In general, you should only disable this if you are developing Buck."

    # Now that the version is guaranteed to be in the user's repository,
    # checkout that hash.
    git checkout $BUCK_REQUIRED_VERSION

    # Now that we have updated the repository, we should rebuild Buck.
    ant clean
  fi
fi

# Make sure that Buck has been built.
if [ ! -e "build/buck.jar" ]; then
  echo "No sign of buck.jar -- building Buck!"
  # Note the jar file will not be used,
  # but serves to represent whether everything has been built.
  ant clean jar
  cd $ORIGINAL_WORKING_DIRECTORY
  # Although ${BASH_SOURCE[0]} may be a relative path, it should
  # be relative to $ORIGINAL_WORKING_DIRECTORY, which is now the
  # current directory.
  "${BASH_SOURCE[0]}" "$@"
  exit $?
fi


# if the output of git status -s is non-empty (-n test), it means there are changed files.
BUCK_REPOSITORY_DIRTY=0
if [ -d ".git" ]; then
  # Make sure buck gets passed the right version.
  BUCK_CURRENT_VERSION=`git rev-parse HEAD`

  if [ -n "`git status -s`" ]; then
    BUCK_REPOSITORY_DIRTY=1
  fi
else
  BUCK_CURRENT_VERSION="UNKNOWN"
fi


# Pop back to the original directory.
popd > /dev/null
popd > /dev/null

EXTRA_FLAGS=''

# To debug BUCK, add the following argument to the command below.  This will wait on port 8888 to
# for Eclipse.
#
# EXTRA_FLAGS="${EXTRA_FLAGS} -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=8888"


# Note that if $RELATIVE_PATH_TO_BUCK_PY changes, then the default value of
# com.facebook.buck.json.BuildFileToJsonParser#PATH_TO_BUCK_PY also needs to be updated.
RELATIVE_PATH_TO_BUCK_PY=src/com/facebook/buck/parser/buck.py
PATH_TO_BUCK_PY="${BUCK_DIRECTORY}/$RELATIVE_PATH_TO_BUCK_PY"

# Run Buck "unpacked," i.e., from specifying its individual classpath elements rather than from a
# single monolithic JAR file that includes all of its dependencies. This speeds up Buck development
# because `ant compile` takes much less time to rebuild Buck than `ant jar` does.
#
java \
-XX:MaxPermSize=256m \
-Xmx1000m \
$EXTRA_FLAGS \
-Djava.awt.headless=true \
-Dbuck.testrunner_classes=${BUCK_DIRECTORY}/build/testrunner/classes \
-Dbuck.path_to_emma_jar=${BUCK_DIRECTORY}/third-party/java/emma-2.0.5312/out/emma-2.0.5312.jar \
-Dbuck.test_util_no_tests_dir=true \
-Dbuck.path_to_buck_py=${PATH_TO_BUCK_PY} \
-Dbuck.path_to_intellij_py=${BUCK_DIRECTORY}/src/com/facebook/buck/command/intellij.py \
-Dbuck.git_commit=${BUCK_CURRENT_VERSION} \
-Dbuck.git_dirty=${BUCK_REPOSITORY_DIRTY} \
-classpath \
${BUCK_DIRECTORY}/src:\
${BUCK_DIRECTORY}/build/classes:\
${BUCK_DIRECTORY}/lib/args4j.jar:\
${BUCK_DIRECTORY}/lib/guava-14.0.1.jar:\
${BUCK_DIRECTORY}/lib/ini4j-0.5.2.jar:\
${BUCK_DIRECTORY}/lib/jackson-annotations-2.0.5.jar:\
${BUCK_DIRECTORY}/lib/jackson-core-2.0.5.jar:\
${BUCK_DIRECTORY}/lib/jackson-databind-2.0.5.jar:\
${BUCK_DIRECTORY}/lib/jsr305.jar:\
${BUCK_DIRECTORY}/lib/sdklib.jar:\
${BUCK_DIRECTORY}/lib/ddmlib-r21.jar:\
${BUCK_DIRECTORY}/lib/jython-standalone-2.5.3.jar:\
${BUCK_DIRECTORY}/lib/jyson-1.0.2.jar \
com.facebook.buck.cli.Main "$@"