How to include version information from dune-project

Learning
6

In case it feels better, you could do something like this:

$ cat dune-project | rg package -A 5
(package
 (name foo)
 (version 1.1)
 (synopsis "Short description")
 (description "Longer description")
 (depends

$ tree version/
version/
└── dune

1 directory, 1 file

$ cat version/dune 
(library
 (name version))

(rule
 (action
  (with-stdout-to
   version.ml
   (run echo "let v = \"%{version:foo}\""))))

$ tree bin/
bin/
├── dune
└── foo.ml

1 directory, 2 files

$ cat bin/dune
(executable
 (public_name foo)
 (libraries version))
↳[0]

$ cat bin/foo.ml 
let () = print_endline Version.v

$ dune exec foo
1.1

using the version:<package> variable documented at Variables - Dune documentation

The dune subst approach feels right to me, so it’s not clear to me how to motivate a need for this, but you could of course write something if you feel motivated! You could also start a discussion on the dune repo if you think there’s a good case to be made for this kind of addition.