Simplify Docker build on Windows

README.md

@@ -340,17 +340,12 @@ brew install shadowsocks-libev
 ### Windows (MinGW)
 To build Windows native binaries, the recommended method is to use Docker:
 
+* On Windows: double-click `make.bat` in `docker\mingw`
 * On Unix-like system:
 
         cd shadowsocks-libev/docker/mingw
         make
 
-* On Windows (Command Prompt):
-
-        cd shadowsocks-libev\docker\mingw
-        docker build --force-rm -t ss --build-arg REBUILD=%RANDOM% .
-        docker run --rm --entrypoint cat ss /bin.tgz > ss-win.tgz
-
 A tarball with 32-bit and 64-bit binaries will be generated in the same directory.
 
 You could also manually use MinGW-w64 compilers to build in Unix-like shell (MSYS2/Cygwin), or cross-compile on Unix-like systems (Linux/MacOS). Please refer to build scripts in `docker/mingw`.

docker/mingw/make.bat

@@ -0,0 +1,11 @@
+@echo off
+pushd %~dp0
+set "REPO=shadowsocks"
+set "REV=master"
+set "IMAGE=ss-build-mingw"
+set "DIST=ss-libev-win-dist.tar.gz"
+docker build --force-rm -t %IMAGE% ^
+      --build-arg REV=%REV% --build-arg REPO=%REPO% ^
+      --build-arg REBUILD=%RANDOM% .
+docker run --rm --entrypoint cat %IMAGE% /bin.tgz > %DIST%
+pause