commit 6e1d3638f851a847dbbaf648d18e629ce3df12ee
Author: brettlangdon <brett@blangdon.com>
Date:   Sat May 9 15:41:25 2015 -0400

    initial commit

diff --git a/README.md b/README.md
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+gopkg
+=====
+
+`gopkg` is a helper wrapper similar to `virtualenvwrapper` for python, making it
+easy to keep package third party dependencies isolated. `gopkg.sh` simply
+provides some bash functions to help manage your `GOPATH`.
+
+
+## Setup
+
+Download the latest version of the script.
+```bash
+mkdir ~/.gopkg
+cd ~/.gopkg
+curl -o gopkg.sh https://raw.githubusercontent.com/brettlangdon/gopkg/master/gopkg.sh
+```
+
+Next modify your `~/.bashrc` or `~/.zshrc` files to include the following
+```bash
+export GOPKG_REPO=github.com/username
+export GOPKG_HOME=~/.gopkg
+source ~/.gopkg/gopkg.sh
+```
+
+### Environment variables
+
+`gopkg` uses the following environment variables
+
+* `GOPATH` - when creating a new package `gopkg` will create a directory for the
+source of your package within your `GOPATH`
+* `GOPKG_REPO` - when creating a new package `gopkg` will use `GOPKG_REPO` as
+the base repository location for your package (e.g. `github.com/username`)
+* `GOPKG_HOME` - when creating a new package `gopkg` will create a new directory
+in `GOPKG_HOME` to store all third party packages (installed normally via `go
+get`) in this directory
+
+
+## Usage
+### Creating a new package
+
+To create a new package use the command `mkgopkg <name>`. This will create
+directories (if they do not already exist) at `$GOPATH/src/$GOPKG_REPO/<name>`
+and `$GOPKG_HOME/<name>` and will update your `GOPATH` to be
+`$GOPKG_HOME/<name>:$GOPATH`.
+
+### Removing an existing package
+
+To remove an existing package run the command `rmgopkg <name>`. `rmgopkg` will
+only remove the directory created inside of `$GOPKG_HOME/<name>`, it will not
+touch the one in `$GOPATH/src/$GOPKG_REPO/<name>`.
+
+### Activating a package
+
+Just like `virtualenv` you have to "activate" a package in order to use
+it. Running `gopkg <name>` will activate an existing package. What it does is
+simply update your `GOPATH` to be `$GOPKG_HOME/<name>:$GOPATH` and add `(<name>)
+` to `PS1`.
+
+The updated `GOPATH` allows `go get` to install all packages into
+`$GOPKG_HOME/<name>` while still being able to successfully find you source
+package in `$GOPATH/src/$GOPKG_REPO/<name>`.
+
+### Deactivating a package
+
+When you are done and want to reset your `PS1` and `GOPATH` variables simply run
+`deactivate`. `deactivate` is a command which is only available once you have
+run `gopkg <name>`.
diff --git a/gopkg.sh b/gopkg.sh
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+#!/usr/bin/env bash
+GOPKG_ORIGINAL_PS1=${PS1}
+GOPKG_ORIGINAL_GOPATH=${GOPATH}
+
+gopkg_verify_env () {
+    env=$(printenv ${1})
+    if [ -z ${env} ];
+    then
+        echo '$'${1}' environment variable must be set.' >&2
+        return 1
+    fi
+
+    return 0
+}
+
+gopkg_get_gopath_base () {
+    # If we have multiple paths on $GOPATH we want the last one
+    paths=$(echo ${GOPATH} | tr ':' '\n')
+    go_path=''
+    echo $paths | while read p;
+    do
+        go_path=$p
+    done
+    echo $go_path
+    return 0
+}
+
+gopkg_get_pkg_dir () {
+    if [ -z $1 ];
+    then
+        echo 'gopkg_get_pkg_dir requires 1 argument' >&2
+        return 1
+    fi
+
+    go_path_base=$(gopkg_get_gopath_base)
+    echo ${go_path_base%%/}'/src/'${GOPKG_REPO%%/}'/'${1}
+    return 0
+}
+
+gopkg_get_pkg_home () {
+    if [ -z $1 ];
+    then
+        echo 'gopkg_get_pkg_home requires 1 argument' >&2
+        return 1
+    fi
+    echo ${GOPKG_HOME%%/}'/'${1}
+    return 0
+}
+
+mkgopkg () {
+    if [ -z ${1} ];
+    then
+        echo 'mkgopkg requires at least 1 argument' >&2
+        return 1
+    fi
+
+    gopkg_verify_env 'GOPKG_HOME' || return 1
+    gopkg_verify_env 'GOPKG_REPO' || return 1
+    gopkg_verify_env 'GOPATH'  || return 1
+
+    pkg_home=$(gopkg_get_pkg_home $1)
+    pkg_dir=$(gopkg_get_pkg_dir $1)
+
+    if [ -d ${pkg_dir} ] && [ -d ${pkg_home} ];
+    then
+        echo 'gopkg '${1}' already exists. Activate it with `gopkg '${1}'`' >&2
+        return 1
+    fi
+    echo 'Creating package source: '${pkg_dir}
+    mkdir -p $pkg_dir
+    echo 'Creating package home: '${pkg_home}
+    mkdir -p $pkg_home
+    echo 'Package '${1}' created.'
+    echo 'Activate with `gopkg '${1}'`'
+    return 0
+}
+
+rmgopkg () {
+    if [ -z ${1} ];
+    then
+        echo 'rmgopkg requires at least 1 argument' >&2
+        return 1
+    fi
+    gopkg_verify_env 'GOPKG_HOME' || return 1
+
+    pkg_home=$(gopkg_get_pkg_home $1)
+    pkg_dir=$(gopkg_get_pkg_dir $1)
+    if [ ! -d ${pkg_home} ];
+    then
+        echo 'gopkg '${1}' does not exist. Not removing anything' >&2
+        return 1
+    fi
+
+    if [ -d ${pkg_dir} ];
+    then
+        echo 'Keeping source directory '${pkg_dir}
+    fi
+
+    echo 'Removing '${pkg_home}
+    rm -rf ${pkg_home}
+    return 0
+}
+
+gopkg () {
+    if [ -z ${1} ];
+    then
+        echo 'gopkg requires at least 1 argument' >&2
+        return 1
+    fi
+    gopkg_verify_env 'GOPKG_HOME' || return 1
+
+    pkg_home=$(gopkg_get_pkg_home $1)
+    if [ ! -d ${pkg_home} ];
+    then
+        echo 'gopkg '${1}' does not exists, create it first with `mkgopkg '${1}'`' >&2
+        return 1
+    fi
+
+    go_path_base=$(gopkg_get_gopath_base)
+    export GOPATH=${pkg_home}:${go_path_base}
+    export PS1='('${1}') '$GOPKG_ORIGINAL_PS1
+
+    eval 'deactivate () {
+      export GOPATH=${GOPKG_ORIGINAL_GOPATH}
+      export PS1=${GOPKG_ORIGINAL_PS1}
+      unset -f deactivate > /dev/null 2>&1
+    }'
+    echo ${1}' activated. Deactivate with `deactivate`'
+
+    return 0
+}