add compatibility with compiler option -no-indent

[jbwheatley]

see #353

This PR adds support for projects that use the compiler option -no-indent. As part of the sbt plugin it checks whether the build has the -no-indent compiler option set and swap whitespace for braces accordingly.
Also adds a CLI option for generating sources with braces.

[jbwheatley]

ran ci locally and latest commit seemed to fix

[jbwheatley]

@keynmol is there an easy way to see the generated code from the tests? I've got a couple of bugs in the refactor and AFAICT it gets cleaned up after the CI run so i can't easily pinpoint the issue. A couple of the pluginTests are failing for me

[keynmol]

@jbwheatley You can just do ~bindgen/run --package bla --out scala --header <full path to test binding file> – that's what I usually do when developing.

Alternatively, you can see where the files are generated:

sbt:root> show testsNative3/Test/managedSources
[info] Build skipped: No changes detected in build configuration and class path contents since last build.
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test_multi_file/functions.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test_multi_file/unions.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test_built_in_types.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test.mty.bla.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test_global_enums.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test_struct_passing.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test_enums.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test_structs.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test_scala_keywords.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test_closure.scala
[info] * /Users/velvetbaldmime/projects/indoorvivants/sn-bindgen/modules/tests/target/native-3/src_managed/test/lib_test.mty.bla.multi/functions.scala

Another alternative is you can wait until I'm done with #360 which checks-in the generated bindings into the stable locations in the repo, to make it

[keynmol]

Plugin tests are a bit wonkier, as SBT scripted tests are opaque and sandboxed.
You can still do the bindgen/run on those bindings with absolute header path to see what's up

[jbwheatley]

thanks for the help, managed to fix things pretty quickly after that. I broke out some util functions as suggested, I think it definitely helps readability and uniformity :)

[keynmol]

I think this extra nesting is unnecessary (no need to fix, I will address myself after merging this)

[keynmol]

Thanks a lot for working on this!
I will make a release of it when #360 is updated and merged, so that we can see the bindings generated.