open go terminal by version

_gvm_export.bat

@echo off
if defined GVM_VERSION (
    echo ERROR: Cannot export on gvm terminal
    exit /b
)
 
set GVM_VERSION=%1
set GOROOT=C:\Go%1
set GOPATH=E:\golang%1
set PATH=%PATH%;%GOROOT%\bin;%GOPATH%\bin

gvm.bat

@echo off
if "%1"=="now" goto current_version
if defined GVM_VERSION goto on_gvm
 
if "%1"=="help" goto installed_versions
if "%1"=="1.8.3" goto start_gvm
if "%1"=="1.9.7" goto start_gvm
if "%1"=="1.13.9" goto start_gvm
 
echo ERROR: Uninstalled or invalid golang version
exit /b
 
:current_version
if defined GVM_VERSION (
    echo %GVM_VERSION%
) else (
    echo ERROR : Not on gvm
)
exit /b
 
:installed_versions
echo installed golang version : 1.8.3, 1.9.7, 1.13.9
exit /b
 
:on_gvm
echo ERROR: Cannot run on gvm terminal
exit /b
 
:start_gvm
call cmd /k "_gvm_export %1"
exit /b