Windows support?

[arturaz]

Hi there!

ScalaPB looks awesome, but does it work on wIndows? If not - what should be modified for it to work on windows?

> protobuf:protobufScalaGenerate
[info] Compiling 4 protobuf files to D:\work\scala\tbsgame\target\scala-2.11\src_managed\main\compiled_protobuf
[info] Compiling schema D:\work\scala\tbsgame\protos\base.proto
[info] Compiling schema D:\work\scala\tbsgame\protos\game.proto
[info] Compiling schema D:\work\scala\tbsgame\protos\management.proto
[info] Compiling schema D:\work\scala\tbsgame\protos\messages.proto
[trace] Stack trace suppressed: run last root/protobuf:protobufScalaGenerate for the full output.
[error] (root/protobuf:protobufScalaGenerate) error occured while compiling protobuf files: Cannot run program "mkfifo": CreateProcess error=2, The system cannot find the file specified
[error] Total time: 0 s, completed 2015-03-25 15.39.13

Also - is there a way to use it in a standalone fashion, not as a part of SBT?

[arturaz]

After some digging around I can see that it doesn't work on non *nix systems, due to use of mkfifo to create pipes and shell scripts to redirect output from stdin to a java process. Hopefully later I can spend some time to make scalapb a standalone generator, which could then be used with any protoc.exe that supports plugins.

[thesamet]

Here are the instructions on how to use ScalaPB outside SBT. I have tested this on Mac OS X, could you try to port the instructions to Windows and update this bug?

• clone ScalaPB.
• Run sbt compilerPlugin/assembly. Note the full path to the JAR file this generates.
• Create a shell script scalapb.sh that looks like this:

#!/usr/bin/env sh
java -jar /path/to/your/ScalaPB/compiler-plugin/target/scala-2.11/compilerPlugin-assembly-0.4.9-SNAPSHOT.jar

• Make it executable: chmod +x scalapb.sh
• Try invoking it like this: protoc --plugin=protoc-gen-scala=/path/to/scalapb.sh e2e/src/main/protobuf/enum.proto --scala_out=/tmp/out2

[arturaz]

It works with some modifications.

1. Create the assembly jar.
2. Use launch4j to wrap it into exe. You can use the following config:

<?xml version="1.0" encoding="UTF-8"?>
<launch4jConfig>
  <dontWrapJar>false</dontWrapJar>
  <headerType>console</headerType>
  <jar>scalapb-0.4.9.jar</jar>
  <outfile>scalapb-0.4.9.exe</outfile>
  <errTitle></errTitle>
  <cmdLine></cmdLine>
  <chdir>.</chdir>
  <priority>normal</priority>
  <downloadUrl>http://java.com/download</downloadUrl>
  <supportUrl></supportUrl>
  <stayAlive>false</stayAlive>
  <restartOnCrash>false</restartOnCrash>
  <manifest></manifest>
  <icon></icon>
  <jre>
    <path></path>
    <bundledJre64Bit>false</bundledJre64Bit>
    <bundledJreAsFallback>false</bundledJreAsFallback>
    <minVersion>1.7.0</minVersion>
    <maxVersion></maxVersion>
    <jdkPreference>preferJre</jdkPreference>
    <runtimeBits>64/32</runtimeBits>
  </jre>
</launch4jConfig>

3. Invoke protoc.exe --plugin=protoc-gen-scala=c:\path\to\scalapb.exe some-file.proto --scala_out=c:\foo\out

I've put a built scalapb on my dropbox: https://www.dropbox.com/s/7wl5lv4j3ehnb7j/scalapb-0.4.9.exe?dl=0

[arturaz]

Take note that compiler options need to specified as this: --scala_out=java_conversions,flat_packages:c:\foo\out

[korayal]

I also have windows as my main development environment. Mine was stuck at:

at com.trueaccord.scalapb.ScalaPbPlugin$.executeProtoc(ScalaPbPlugin.scala:84)
...
...
Caused by: java.lang.UnsupportedOperationException
        at java.nio.file.Files.setPosixFilePermissions(Files.java:2044)
        at com.trueaccord.scalapb.compiler.Process$.createShellScript(Process.scala:80)

I have GnuWin32 binaries on my PATH. So I think this is the reason I got further.

I haven't tried out what happens on IntelliJ IDEA.

Tried it again on Cygwin and the issue is definitely about the posixfilepermissions. On windows you don't need to set the file permission to be executable, so if you can limit this to only UNIX (or use chmod directly) I think we will be able to run this.

[korayal]

is it possible in SBT to temporarily prevent scalapb from compiling the proto data if the OS is Windows?

[thesamet]

ScalaPB 0.4.9 should work on Windows. There's one caveat: you'll need Python 2.x installed on your system for the proto compilation step. If Python.exe is not in your PATH there are instructions here http://trueaccord.github.io/ScalaPB/sbt-settings.html on how to configure ScalaPB to find it.