From f606d7dd32bd829f2a357c7a4371a4f9a0f956b1 Mon Sep 17 00:00:00 2001
From: Gabriele Bozzola <sbozzolator@gmail.com>
Date: Mon, 2 Sep 2024 08:41:08 -0700
Subject: [PATCH] Add method for `dependencies(uuid)`

The function `dependencies` has two methods:

- First, with a `EnvCache`. When called with this, it returns the
  list of dependencies of the environment.

- Second, with a function and a UUID. When called with these arguments, it
  returns the list of dependencies of given UUID and applies the function.

This second method is not documented, but, when called with the identity
function, provides a very simple way to answer the question "What are the direct
dependencies of a given package?".

This is a valuable piece of information when developing tooling that assist
people keeping the number dependencies minimal.

As things are, one has to call `Pkg.dependencies(identity, uuid)` to answer the
abovementioned question. With this commit, a new method `Pkg.dependencies(uuid)`
is added providing a natural way to obtain the list of direct dependencies of a
package.
---
 src/API.jl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/API.jl b/src/API.jl
index 401ca06be1..0a1192ca5a 100644
--- a/src/API.jl
+++ b/src/API.jl
@@ -85,12 +85,15 @@ function dependencies(env::EnvCache)
     pkgs = Operations.load_all_deps_loadable(env)
     return Dict(pkg.uuid::UUID => package_info(env, pkg) for pkg in pkgs)
 end
-function dependencies(fn::Function, uuid::UUID)
+function dependencies(uuid::UUID)
     dep = get(dependencies(), uuid, nothing)
     if dep === nothing
         pkgerror("dependency with UUID `$uuid` does not exist")
     end
-    fn(dep)
+    return dep
+end
+function dependencies(fn::Function, uuid::UUID)
+    return fn(dependencies(uuid))
 end