@echo off
chcp 65001>nul
SetLocal

:: status
for /f %%i in ('PowerShell -NoLogo -NonInteractive -NoProfile -Command "$(Get-ItemProperty -Path \"HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\" -Name \"ProxyEnable\").ProxyEnable"') do (
    set status=%%i
)


:: server
for /f %%i in ('PowerShell -NoLogo -NonInteractive -NoProfile -Command "$(Get-ItemProperty -Path \"HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\" -Name \"ProxyServer\").ProxyServer"') do (
    set server=%%i
)


:: toggle
if "%1" == "" goto toggle


:proxy
PowerShell -NoLogo -NonInteractive -NoProfile -Command "Write-Host 'Found proxy address ' -NoNewLine ; Write-Host -Fore Cyan '%server%' -NoNewLine ; Write-Host ' from argument, ' -NoNewLine ; Write-Host -Fore Green 'enable' -NoNewLine ; Write-Host ' system proxy...'"
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyEnable /t REG_DWORD /d 1 /f >nul 2>nul
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyServer /d "%1" /f >nul 2>nul
goto end


:toggle
if "%server%" == "" goto disable
if "%status%" == "1" goto disable


:enable
PowerShell -NoLogo -NonInteractive -NoProfile -Command "Write-Host 'Found proxy address ' -NoNewLine ; Write-Host -Fore Blue '%server%' -NoNewLine ; Write-Host ' from registry, ' -NoNewLine ; Write-Host -Fore Green 'enable' -NoNewLine ; Write-Host ' system proxy...'"
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyEnable /t REG_DWORD /d 1 /f >nul 2>nul
goto end


:disable
PowerShell -NoLogo -NonInteractive -NoProfile -Command "Write-Host 'Proxy ' -NoNewLine ; Write-Host -Fore Blue 'IP:PORT' -NoNewLine ; Write-Host ' not set, ' -NoNewLine ; Write-Host -Fore Red 'disable' -NoNewLine ; Write-Host ' system proxy...'"
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyEnable /t REG_DWORD /d 0 /f >nul 2>nul
goto end


:end
EndLocal

proxy.bat 127.0.0.1:1080

proxy.bat