GoEnv - python virtualenv-like way to set GOPATH

goenv

#!/usr/bin/env bash

# Run `goenv ./env-dir` to create an isolated dependencies dir
# Source the resulting file to activate  it in a local shell session
#    . env-dir/go-activate
# This sets GOPATH and adds a PATH entry to the environment
# Run `go-deactivate` to deactivate it.

if [[ -z "$1" ]]; then
    echo "No name specified"
    exit 1
fi

TARGET="$1"; shift
TARGET_F="$(readlink -f "$TARGET")"
TARGET_N="$(basename "$TARGET_F")"

mkdir "$TARGET_F"

cat <<EOF > "$TARGET/go-activate"

if env | grep GOENV_OLD -q ; then
    echo "Already activated"
else

    GOENV_OLD_PS1="\$PS1"
    GOENV_OLD_PATH="\$PATH"

    export PS1="(goenv:$TARGET_N) \$PS1"
    export GOPATH="$TARGET_F"
    export PATH="$TARGET_F/bin:\$PATH"

    go-deactivate() {
        export PS1="\$OLD_PS1"
        unset GOPATH
        export PATH="\$GOENV_OLD_PATH"

        unset GOENV_OLD_PS1
        unset GOENV_OLD_PATH

        unset go-deactivate
    }

fi
EOF

echo "Created GOPATH directory at $TARGET . Source '$TARGET/go-activate' to load it."