deps command: add --include-implicit flag

Library/Homebrew/cmd/deps.rb

@@ -31,6 +31,8 @@ class Deps < AbstractCommand
                description: "Show the union of dependencies for multiple <formula>, instead of the intersection."
         switch "--full-name",
                description: "List dependencies by their full name."
+        switch "--include-implicit",
+               description: "Include implicit dependencies used to download and unpack source files"
         switch "--include-build",
                description: "Include `:build` dependencies for <formula>."
         switch "--include-optional",
@@ -102,6 +104,7 @@ def run
                                       !args.tree? &&
                                       !args.graph? &&
                                       !args.HEAD? &&
+                                      !args.include_implicit? &&
                                       !args.include_build? &&
                                       !args.include_test? &&
                                       !args.include_optional? &&

Library/Homebrew/cmd/uses.rb

@@ -37,6 +37,8 @@ class UnavailableFormula < T::Struct
         switch "--eval-all",
                description: "Evaluate all available formulae and casks, whether installed or not, to show " \
                             "their dependents."
+        switch "--include-implicit",
+               description: "Include formulae that specify <formula> as a `:build` dependency."
         switch "--include-build",
                description: "Include formulae that specify <formula> as a `:build` dependency."
         switch "--include-test",
@@ -73,6 +75,7 @@ def run
 
         use_runtime_dependents = args.installed? &&
                                  !used_formulae_missing &&
+                                 !args.include_implicit? &&
                                  !args.include_build? &&
                                  !args.include_test? &&
                                  !args.include_optional? &&

Library/Homebrew/dependencies_helpers.rb

@@ -11,6 +11,7 @@ module DependenciesHelpers
 
   def args_includes_ignores(args)
     includes = [:required?, :recommended?] # included by default
+    includes << :implicit? if args.include_implicit?
     includes << :build? if args.include_build?
     includes << :test? if args.include_test?
     includes << :optional? if args.include_optional?