#!/usr/bin/env bash

# Ensure this file is executable via chmod a+x lein, then place it
# somewhere on your $PATH, like ~/bin. The rest of Leiningen will be
# installed upon first run into the ~/.lein/self-installs directory.

export LEIN_VERSION="2.0.0-preview8"

case $LEIN_VERSION in
    *SNAPSHOT) SNAPSHOT="YES" ;;
    *) SNAPSHOT="NO" ;;
esac

if [ `id -u` -eq 0 ] && [ "$LEIN_ROOT" = "" ]; then
    echo "WARNING: You're currently running as root; probably by accident."
    echo "Press control-C to abort or Enter to continue as root."
    echo "Set LEIN_ROOT to disable this warning."
    read _
fi

NOT_FOUND=1
ORIGINAL_PWD="$PWD"
while [ ! -r "$PWD/project.clj" ] && [ "$PWD" != "/" ] && [ $NOT_FOUND -ne 0 ]
do
    cd ..
    if [ "$(dirname "$PWD")" = "/" ]; then
        NOT_FOUND=0
        cd "$ORIGINAL_PWD"
    fi
done

export LEIN_HOME=${LEIN_HOME:-"$HOME/.lein"}

if [ "$OSTYPE" = "cygwin" ]; then
    export LEIN_HOME=`cygpath -w $LEIN_HOME`
fi

LEIN_JAR="$LEIN_HOME/self-installs/leiningen-$LEIN_VERSION-standalone.jar"

# normalize $0 on certain BSDs
if [ "$(dirname "$0")" = "." ]; then
    SCRIPT="$(which $(basename "$0"))"
else
    SCRIPT="$0"
fi

# resolve symlinks to the script itself portably
while [ -h "$SCRIPT" ] ; do
    ls=`ls -ld "$SCRIPT"`
    link=`expr "$ls" : '.*-> \(.*\)$'`
    if expr "$link" : '/.*' > /dev/null; then
        SCRIPT="$link"
    else
        SCRIPT="$(dirname "$SCRIPT"$)/$link"
    fi
done

BIN_DIR="$(dirname "$SCRIPT")"

if [ -r "$BIN_DIR/../src/leiningen/version.clj" ]; then
    # Running from source checkout
    LEIN_DIR="$(dirname "$BIN_DIR")"

    # Need to use lein 1.x to bootstrap the leiningen-core library (for aether)
    if [ "$(ls $LEIN_DIR/leiningen-core/lib/*)" = "" ]; then
        echo "Leiningen is missing its dependencies."
        echo "Please see \"Building\" in the README."
        exit 1
    fi

    # If project.clj for lein or leiningen-core changes, we must recalculate
    LAST_PROJECT_CHECKSUM=$(cat "$LEIN_DIR/.lein-project-checksum" 2> /dev/null)
    PROJECT_CHECKSUM=$(sum "$LEIN_DIR/project.clj" "$LEIN_DIR/leiningen-core/project.clj")
    if [ "$PROJECT_CHECKSUM" != "$LAST_PROJECT_CHECKSUM" ]; then
        if [ -r "$LEIN_DIR/.lein-classpath" ]; then
            rm "$LEIN_DIR/.lein-classpath"
        fi
    fi

    # Use bin/lein to calculate its own classpath since src/ and
    # leiningen-core/lib/*jar suffices to run the classpath task.
    if [ ! -r "$LEIN_DIR/.lein-classpath" ] && [ "$1" != "classpath" ]; then
        echo "Recalculating Leiningen's classpath."
        ORIG_PWD="$PWD"
        cd "$LEIN_DIR"

        $0 classpath .lein-classpath
        sum $LEIN_DIR/project.clj $LEIN_DIR/leiningen-core/project.clj > \
            .lein-project-checksum
        cd "$ORIG_PWD"
    fi

    mkdir -p "$LEIN_DIR/target/classes"
    export LEIN_JVM_OPTS=${LEIN_JVM_OPTS:-"-Xms64m -Xmx256m -Dclojure.compile.path=$LEIN_DIR/target/classes"}
    CLASSPATH="$LEIN_DIR/leiningen-core/src/"
    CLASSPATH="$CLASSPATH:$LEIN_DIR/leiningen-core/resources/"
    if [ -r "$LEIN_DIR/.lein-classpath" ]; then
        CLASSPATH="$CLASSPATH:$(cat $LEIN_DIR/.lein-classpath 2> /dev/null)"
    else
        CLASSPATH="$CLASSPATH:$LEIN_DIR/leiningen-core/lib/*"
    fi
    CLASSPATH="$CLASSPATH:$LEIN_DIR/test:$LEIN_DIR/target/classes"
    CLASSPATH="$CLASSPATH:$LEIN_DIR/src:$LEIN_DIR/resources:$LEIN_JAR"
    if [ -f .lein-classpath ]; then
        CLASSPATH="`cat .lein-classpath`:$CLASSPATH"
    fi
else # Not running from a checkout
    # apply context specific CLASSPATH entries
    if [ -f .lein-classpath ]; then
        CLASSPATH="`cat .lein-classpath`:$LEIN_JAR"
    else
        CLASSPATH="$LEIN_JAR"
    fi

    export LEIN_JVM_OPTS=${LEIN_JVM_OPTS:-"-Xbootclasspath/a:$LEIN_JAR"}

    if [ ! -r "$LEIN_JAR" -a "$1" != "self-install" ]; then
        "$0" self-install
    fi
fi

if [ "$HTTP_CLIENT" = "" ]; then
    if type -p curl >/dev/null 2>&1; then
        if [ "$https_proxy" != "" ]; then
            CURL_PROXY="-x $https_proxy"
        fi
        HTTP_CLIENT="curl $CURL_PROXY -f -L -o"
    else
        HTTP_CLIENT="wget -O"
    fi
fi

# TODO: explain what to do when Java is missing
export JAVA_CMD=${JAVA_CMD:-"java"}
export LEIN_JAVA_CMD=${LEIN_JAVA_CMD:-$JAVA_CMD}

# Support $JAVA_OPTS for backwards-compatibility.
export JVM_OPTS="${JVM_OPTS:-"$JAVA_OPTS"}"

# TODO: investigate http://skife.org/java/unix/2011/06/20/really_executable_jars.html
# If you're packaging this for a package manager (.deb, homebrew, etc)
# you need to remove the self-install and upgrade functionality or see lein-pkg.
if [ "$1" = "self-install" ]; then
    if [ -r "$LEIN_JAR" ]; then
      echo "The self-install jar already exists at $LEIN_JAR."
      echo "If you wish to re-download, delete it and rerun \"$0 self-install\"."
      exit 1
    fi
    echo "Downloading Leiningen now..."
    LEIN_DIR=`dirname "$LEIN_JAR"`
    mkdir -p "$LEIN_DIR"
    LEIN_URL="https://github.com/downloads/technomancy/leiningen/leiningen-$LEIN_VERSION-standalone.jar"
    $HTTP_CLIENT "$LEIN_JAR" "$LEIN_URL"
    if [ $? != 0 ]; then
        echo "Failed to download $LEIN_URL"
        echo "If you have an old version of libssl you may not have the correct"
        echo "certificate authority. Either upgrade or set HTTP_CLIENT to insecure:"
        echo "  export HTTP_CLIENT=\"wget --no-check-certificate -O\" # or"
        echo "  export HTTP_CLIENT=\"curl --insecure -f -L -o"
        if [ $SNAPSHOT = "YES" ]; then
            echo "If you have Maven installed, you can do"
            echo "mvn dependency:copy-dependencies; mv target/dependency lib"
            echo "See README.md for further SNAPSHOT build instructions."
        fi
        rm $LEIN_JAR 2> /dev/null
        exit 1
    fi
elif [ "$1" = "upgrade" ]; then
    if [ "$LEIN_DIR" != "" ]; then
        echo "The upgrade task is not meant to be run from a checkout."
        exit 1
    fi
    if [ $SNAPSHOT = "YES" ]; then
        echo "The upgrade task is only meant for stable releases."
        echo "See the \"Hacking\" section of the README."
        exit 1
    fi
    if [ ! -w "$SCRIPT" ]; then
        echo "You do not have permission to upgrade the installation in $SCRIPT"
        exit 1
    else
        TARGET_VERSION="${2:-"preview"}"
        echo "The script at $SCRIPT will be upgraded to the latest $TARGET_VERSION version."
        echo -n "Do you want to continue [Y/n]? "
        read RESP
        case "$RESP" in
            y|Y|"")
                echo
                echo "Upgrading..."
                TARGET="/tmp/lein-$$-upgrade"
                if [ "$OSTYPE" = "cygwin" ]; then
                    TARGET=`cygpath -w $TARGET`
                fi
                LEIN_SCRIPT_URL="https://github.com/technomancy/leiningen/raw/$TARGET_VERSION/bin/lein"
                $HTTP_CLIENT "$TARGET" "$LEIN_SCRIPT_URL" \
                    && mv "$TARGET" "$SCRIPT" \
                    && chmod +x "$SCRIPT" \
                    && echo && "$SCRIPT" self-install && echo && echo "Now running" `$SCRIPT version`
                exit $?;;
            *)
                echo "Aborted."
                exit 1;;
        esac
    fi
else
    if [ "$OSTYPE" = "cygwin" ]; then
        # When running on Cygwin, use Windows-style paths for java
        ORIGINAL_PWD=`cygpath -w "$ORIGINAL_PWD"`
        CLASSPATH=`cygpath -wp "$CLASSPATH"`
    fi

    if [ $DEBUG ]; then
        echo "Classpath: $CLASSPATH"
    fi

    TRAMPOLINE_FILE="/tmp/lein-trampoline-$$"
    if [ "$OSTYPE" = "cygwin" ]; then
        TRAMPOLINE_FILE=`cygpath -w $TRAMPOLINE_FILE`
    fi

    $LEIN_JAVA_CMD \
        -client -XX:+TieredCompilation \
        $LEIN_JVM_OPTS \
        -Dfile.encoding=UTF-8 \
        -Dmaven.wagon.http.ssl.easy=false \
        -Dleiningen.original.pwd="$ORIGINAL_PWD" \
        -Dleiningen.trampoline-file=$TRAMPOLINE_FILE \
        -cp "$CLASSPATH" \
        clojure.main -m leiningen.core.main "$@"

    EXIT_CODE=$?

    if [ -r $TRAMPOLINE_FILE ]; then
        TRAMPOLINE="$(cat $TRAMPOLINE_FILE)"
        rm $TRAMPOLINE_FILE
        exec sh -c "exec $TRAMPOLINE"
    else
        exit $EXIT_CODE
    fi
fi