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Add note for paradox on Windows (Fix #22986)

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Richard Imaoka 2017-05-21 04:50:38 +09:00
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CONTRIBUTING.md
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@ -228,6 +228,39 @@ akka-docs/paradox
The generated html documentation is in `akka-docs/target/paradox/site/main/index.html`.
### Note for paradox on Windows
On Windows, you need special care to generate html documentation with paradox.
Currently `akka-docs/src/main/paradox/java` has symbolic links which point to directories under `akka-docs/src/main/paradox/scala`.
- java/additional -> scala/additional
- java/common -> scala/common
- java/general -> scala/general
- java/guide -> scala/project
- java/security -> scala/security
So, if you just do `git clone <URL>`, then run `sbt akka-docs/paradox`, you will run into an an error like below,
because symlinks are checked out in a Linux style which doesn't work on Windows.
```
sbt akka-docs/paradox
[trace] Stack trace suppressed: run last akka-docs/compile:paradoxMarkdownToHtml for the full output.
[error] (akka-docs/compile:paradoxMarkdownToHtml) com.lightbend.paradox.markdown.Index$LinkException: Unknown page [common/cluster.md] linked from [java/index-network.md]
```
As described in http://stackoverflow.com/a/42137273, recent versions of git scm can convert Linux-style symlinks to the Windows style,
with `git clone`:
- Launch git scm whose version is on or later than 2.11.1
- **with administrator rights**
- `git clone -c core.symlinks=true <URL>`
Then the symlinks are checked out in the Windows style, and the paradox command works fine.
In a future version of akka, this trick for Windows should not be needed - we will use [paradox groups](http://developer.lightbend.com/docs/paradox/latest/features/groups.html)
to get rid of duplicate documentation in Java and Scala. At that point we don't need the symlinks anymore.
### Scaladoc
Akka generates class diagrams for the API documentation using ScalaDoc. This needs the `dot` command from the Graphviz software package to be installed to avoid errors. You can disable the diagram generation by adding the flag `-Dakka.scaladoc.diagrams=false`. After installing Graphviz, make sure you add the toolset to the PATH (definitely on Windows).