Re: [Haskell-beginners] Stack minimal dependency specification, or dependency tree output

26 Feb 2016

      Hi again Simon,

While `stack dot --external --depth 0` gets the job done, I had a little
play around with the idea of finding the initial nodes on the implicit
dependency graph, rather than a traversal from the initial dependency list,
and the results for this project are quite a bit shorter:

lyndon@endpin  master ✔ ~/Silverpond/promise_backend stack dot --external |
grep -v PromiseBackend | stack-minimal-dependencies-exe
Right (fromList [Node "StringId \"errors\""
                        ,Node "StringId \"snap\""
                        ,Node "StringId \"wreq\""])

lyndon@endpin  master ✔ ~/Silverpond/promise_backend stack dot --external
--depth=0
strict digraph deps {
"PromiseBackend" [style=dashed];
"PromiseBackend" -> "aeson";
"PromiseBackend" -> "base";
"PromiseBackend" -> "bytestring";
"PromiseBackend" -> "containers";
"PromiseBackend" -> "errors";
"PromiseBackend" -> "lens";
"PromiseBackend" -> "lens-aeson";
"PromiseBackend" -> "mtl";
"PromiseBackend" -> "snap";
"PromiseBackend" -> "text";
"PromiseBackend" -> "transformers";
"PromiseBackend" -> "unordered-containers";
"PromiseBackend" -> "wreq";
}

Not that it really matters, but thought it might be interesting for anyone
who was following this thread.

The code I used to compute this is awful, and lives here:

https://github.com/sordina/stack-minimal-dependencies/blob/master/app/Main.h...

:)

Later!

 - Lyndon

On Thu, Feb 25, 2016 at 10:58 AM, Lyndon Maydwell 
wrote:
...
Hi Simon,
...
stack dot --external --depth 0
That's exactly what I was first looking for!
Cheers :)
- Lyndon
On Thu, Feb 25, 2016 at 9:55 AM, Simon Jakobi 
...
wrote:
...
Hi Lyndon,
I'd like to see some kind of tree instead, so that when I pre-install the
...
dependencies, I can specify a minimal list, rather than a whole slew of
dependencies that would be pulled in transitively anyway.
There's "stack list-dependencies" but that includes the transitive
dependencies.
You can get the dependency tree (or rather dependency graph) with "stack
dot --external"
"stack dot --external --depth 0" will show only the direct dependencies
of your project.
More stack dot examples:
http://docs.haskellstack.org/en/stable/dependency_visualization/
Cheers,
Simon
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