pkg: add initial pkg.intersects(Dep) support

lib/pkgcraft/pkg/base.rb

@@ -35,6 +35,7 @@ def self.release(ptr)
     attach_function :pkgcraft_pkg_format, [:pointer], :int
     attach_function :pkgcraft_pkg_free, [:pointer], :void
     attach_function :pkgcraft_pkg_hash, [Pkg], :uint64
+    attach_function :pkgcraft_pkg_intersects_dep, [Pkg, Pkgcraft::Dep::Dep], :bool
     attach_function :pkgcraft_pkg_repo, [Pkg], :pointer
     attach_function :pkgcraft_pkg_restrict, [Pkg], Restrict
     attach_function :pkgcraft_pkg_str, [Pkg], String
@@ -90,6 +91,12 @@ def version
         cpv.version
       end
 
+      def intersects(other)
+        return C.pkgcraft_pkg_intersects_dep(self, other) if other.is_a? Pkgcraft::Dep::Dep
+
+        raise TypeError.new("Invalid type: #{other.class}")
+      end
+
       def <=>(other)
         C.pkgcraft_pkg_cmp(self, other)
       end

test/pkg/test_ebuild.rb

@@ -47,6 +47,28 @@ def test_version
     assert_equal(Version.new("1"), pkg.version)
   end
 
+  def test_intersects
+    repo = EbuildTemp.new(id: "test")
+    pkg = repo.create_pkg("cat/pkg-1-r2", "SLOT=0/1")
+    assert(pkg.intersects(Dep.new("cat/pkg")))
+    refute(pkg.intersects(Dep.new("a/b")))
+    assert(pkg.intersects(Dep.new("=cat/pkg-1-r2")))
+    refute(pkg.intersects(Dep.new(">cat/pkg-1-r2")))
+    assert(pkg.intersects(Dep.new("cat/pkg:0")))
+    refute(pkg.intersects(Dep.new("cat/pkg:1")))
+    assert(pkg.intersects(Dep.new("cat/pkg:0/1")))
+    refute(pkg.intersects(Dep.new("cat/pkg:0/2")))
+    assert(pkg.intersects(Dep.new("cat/pkg::test")))
+    refute(pkg.intersects(Dep.new("cat/pkg::repo")))
+
+    # invalid types
+    ["", nil].each do |obj|
+      assert_raises TypeError do
+        pkg.intersects(obj)
+      end
+    end
+  end
+
   def test_path
     repo = EbuildTemp.new
     path = repo.create_ebuild("cat/pkg-1")