Append output of dependencyTree `toFile` for multi-module projects

[saketjajoo]

Currently, there's an option to write the output of dependencyTree to a file using the toFile sub-command. This works fine for single-module projects. But for multi-module projects, this throws an error saying "Target file for dependencyTree already exists at <file_location>. Use '-f' to override".

If -f/--force is used, this overwrites the output in the existing file:

• https://github.com/sbt/sbt/blob/develop/main/src/main/scala/sbt/plugins/DependencyTreeSettings.scala#L273-L277
• https://github.com/sbt/sbt/blob/develop/main/src/main/scala/sbt/plugins/DependencyTreeSettings.scala#L163-L164

The data is written to file using the IO.write() method function. There's an option to append to file using a parameter called append: Boolean = false that is not used as of now. If this parameter is used (eg. IO.write(targetFile, data, IO.utf8, true)), then it would enable fetching of dependencies of all modules in a multi-module project.

[cp-endor]

I am hitting the same problem @saketjajoo were you able to find any workaround ?

[mkurz]

I think it shouldn't be that hard to implement a -a/--append flag, just as the force one. You want to work on that? Asking since I was experiencing the same problem...

[mkurz]

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