I want to create a Cabal project with the possibility to include multiple packages in the same project. When I read Cabal documentation, it says that one has to create a "cabal.project" file. Is this file created manually into the project root or is there a command to create it? The documentation says that all modifications shall be made in the "cabal.project.local" file. How this file is created? Does this mean that to create a cabal project with multiples packages one has to have a "cabal.project" file and a "cabal.project.local" file in the same project root? Thanks.
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Don't overthink this. A
cabal.project
file is mostly just listing some packages that you want to build together as a unit, instead of pulling them from Hackage. So yeah, simply create it manually.What the docs mean by ‘all modifications shall be made in the "cabal.project.local" file’ is that the
cabal.project
should specify what is always needed to build the project (e.g. packages that simply aren't on Hackage at all, but are included in your repo either directly or as Git submodules), whereas if you just make some tweaks (e.g. experimentally testing out what needs to be changed so your package will compile with a new version of some 3rd-party dependency, which you've checked out locally before considering to file a pull request or to fork it into your own repo) then this should go in thecabal.project.local
file. But honestly, you could as well make the changes incabal.project
and then simply notgit add
them†.IMO all actually important information to make the package future-proof should reside in the
packagename.cabal
file and/or astack.yaml
file, not incabal.project
.†The danger here is that it's easy to accidentally commit changes that were only meant to be local to already-VCS'd files. I always use
git add -p
so that I review any changes I'm adding, before committing.