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@glesica glesica/swgo.bash
Created Mar 27, 2018

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Switch Go (swgo): A very simple and intensely opinionated Go version manager
# Switch Go (swgo)
# A very simple and intensely opinionated Go version manager.
#
# Author: George Lesica <george@lesica.com>
#
# To use, create a file called ".swgo" in any project directory.
# Inside of this file, set two variables: GOROOT_ and GOPATH_
# to the values you want assigned to GOROOT and GOPATH,
# respectively. Then, while in that directory, just run "swgo"
# and your GOROOT, GOPATH, and PATH will be updated accordingly.
#
# A nice optimization is to create a ".swgo" file in your home
# directory so you can easily restore your default environment.
# If no ".swgo" file is found in the current working directory
# your home directory will be checked next.
function swgo() {
local SWGO_CONFIG='.swgo'
# Look for the local .swgo file or, failing that, one
# in the home directory. If neither is found, exit with
# an error.
if [[ ! -f "$SWGO_CONFIG" ]]; then
if [[ ! -f "$HOME/$SWGO_CONFIG" ]]; then
>&2 echo "No config file ($SWGO_CONFIG) found."
return 1
else
SWGO_CONFIG="$HOME/$SWGO_CONFIG"
fi
fi
# Source the config to get the new variables,
# GOPATH_ and GOROOT_ that will replace the
# existing values of GOPATH and GOROOT,
# respectively.
source $SWGO_CONFIG
# If there was no GOROOT_ found in the config then
# we can't set a new environment.
if [[ -z ${GOROOT_+x} ]]; then
>&2 echo "No GOROOT_ defined in config."
return 1
fi
# If there was no GOPATH_ found in the config then
# we can't set a new environment.
if [[ -z ${GOROOT_+x} ]]; then
>&2 echo "No GOPATH_ defined in config."
return 1
fi
# If there is an existing GOROOT we need to remove it
# from the PATH.
if [[ -n ${GOROOT+x} ]]; then
export PATH="${PATH//"$GOROOT/bin"}"
export PATH="${PATH//"$GOROOT/bin/"}"
unset GOROOT
fi
# If there is an existing GOPATH we need to remove it
# from the PATH.
if [[ -n ${GOPATH+x} ]]; then
export PATH="${PATH//"$GOPATH/bin"}"
export PATH="${PATH//"$GOPATH/bin/"}"
unset GOPATH
fi
# Kind of ugly but sometimes we want to clean up the
# PATH. There are a couple cases:
# 1. Leftover "::"
# 2. Leading ":"
# 3. Trailing ":"
export PATH="${PATH/::/:}"
export PATH="${PATH/#:/}"
export PATH="${PATH/%:/}"
# We have now blown away the existing Go
# environment so we are free to set up a new
# one using the config values.
# Set the new GOROOT from the config if one was
# specified.
export GOROOT="$GOROOT_"
unset GOROOT_
# Set the new GOPATH from the config if one was
# specified.
export GOPATH="$GOPATH_"
unset GOPATH_
# Update the path with the new GOROOT and GOPATH
# values. We prepend the GOROOT to prevent the
# system Go from being used.
export PATH="$GOROOT/bin:$PATH:$GOPATH/bin"
echo "GOROOT=$GOROOT"
echo "GOPATH=$GOPATH"
return 0
}
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