build.sh to build.cmd (#2319)

* build.sh to build.cmd

convert and adapt for Windows users

* remove hardwired GO ARCH

* silence cmd.exe

* update directions for Windows

* Update INSTALL.md

Co-authored-by: emanuele.aliberti <emanuele.aliberti@mtka.eu>
Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

build.cmd

@@ -0,0 +1,51 @@
+@echo off
+
+:ENTRY_POINT
+    setlocal EnableDelayedExpansion
+
+    REM script base dir
+    set SCRIPTDIR=%~dp0
+    set PROJDIR=%SCRIPTDIR:~0,-1%
+
+    REM Put installed packages into ./bin
+    set GOBIN=%PROJDIR%\bin
+
+    set FLAGS=
+
+    REM Check if sources are under Git control
+    if not exist ".git" goto :CHECK_BIN
+
+    REM set BUILD=`git rev-parse --short HEAD \\ ""`
+    FOR /F "tokens=*" %%X IN ('git rev-parse --short HEAD') DO (
+        set BUILD=%%X
+    )
+
+    REM set BRANCH=`(git symbolic-ref --short HEAD \ tr -d \/ ) \\ ""`
+    FOR /F "tokens=*" %%X IN ('git symbolic-ref --short HEAD') DO (
+        set BRANCHRAW=%%X
+        set BRANCH=!BRANCHRAW:/=!
+    )
+    if "%BRANCH%" == "main" set BRANCH=
+
+    set FLAGS=-X github.com/matrix-org/dendrite/internal.branch=%BRANCH% -X github.com/matrix-org/dendrite/internal.build=%BUILD%
+
+:CHECK_BIN
+    if exist "bin" goto :ALL_SET
+    mkdir "bin"
+
+:ALL_SET
+    set CGO_ENABLED=1
+    for /D %%P in (cmd\*) do (
+        go build -trimpath -ldflags "%FLAGS%" -v -o ".\bin" ".\%%P"
+    )
+
+    set CGO_ENABLED=0
+    set GOOS=js
+    set GOARCH=wasm
+    go build -trimpath -ldflags "%FLAGS%" -o bin\main.wasm .\cmd\dendritejs-pinecone
+
+    goto :DONE
+
+:DONE
+    echo Done
+    endlocal

docs/INSTALL.md

@@ -34,6 +34,10 @@ If you want to run a polylith deployment, you also need:
 
 * A standalone [NATS Server](https://github.com/nats-io/nats-server) deployment with JetStream enabled
 
+If you want to build it on Windows, you need `gcc` in the path:
+
+* [MinGW-w64](https://www.mingw-w64.org/)
+
 ## Building Dendrite
 
 Start by cloning the code:
@@ -45,9 +49,15 @@ cd dendrite
 
 Then build it:
 
-```bash
+* Linux or UNIX-like systems:
-./build.sh
+  ```bash
-```
+  ./build.sh
+  ```
+
+* Windows:
+  ```dos
+  build.cmd
+  ```
 
 ## Install NATS Server