Shell 函数实现Go语言多版本管理轻量级方案

####### GOLANG VERSION MANAGE FUNCTIONS ######
# ref: https://go.dev/doc/manage-install
function goinstall() {
 echo "Downloading go$1 ..."
 go install golang.org/dl/go$1@latest && go$1 download
}

function gouse() {
 gopath=$(go env GOPATH)
 if test -x ${gopath}/bin/go$1; then
  rm -f ${gopath}/bin/go
  echo "Relink go with go$1 ..."
  ln -s ${gopath}/bin/go$1 ${gopath}/bin/go
  echo "Done"
 else
  echo "Version $1 not installed"
 fi
}

function golist() {
 current=$(go version | awk '{print $3}' | cut -c3-)
 for v in $(ls $(go env GOPATH)/bin | grep -E 'go(\d.*)' | cut -c3-);
 do
  if [ $v = $current ]; then
   echo "$v (⇦ current)"
  else
   echo $v
  fi
 done
}

function gouninstall() {
 current=$(go version | awk '{print $3}' | cut -c3-)
 if [ $1 = $current ]; then
  echo "version $1 is actived, please change to another version first"
  return
 fi
 echo "Removing binary..."
 rm -f $(go env GOPATH)/bin/go$1
 echo "Removing sdk ..."
 rm -r ~/sdk/go$1
 echo "Done"
}