status: Exclude pkgs not in depgraph from project status

Author: darkowlzz

cmd/dep/status.go

@@ -839,6 +839,15 @@ func runProjectStatus(ctx *dep.Ctx, args []string, p *dep.Project, sm gps.Source
 	// Collect reachmap of all the locked projects.
 	reachmaps := make(map[string]pkgtree.ReachMap)
 
+	// Create a list of depgraph packages to be used to exclude packages that
+	// the root project does not use.
+	rootPkgTree, err := p.ParseRootPackageTree()
+	if err != nil {
+		return err
+	}
+	rootrm, _ := rootPkgTree.ToReachMap(true, true, false, p.Manifest.IgnoredPackages())
+	depgraphPkgs := rootrm.FlattenFn(paths.IsStandardImportPath)
+
 	// Collect and store all the necessary data from pkgtree(s).
 	// TODO: Make this concurrent.
 	for _, pl := range p.Lock.Projects() {
@@ -878,6 +887,11 @@ func runProjectStatus(ctx *dep.Ctx, args []string, p *dep.Project, sm gps.Source
 			}
 
 			for pkg, ie := range rmap {
+				// Exclude packages not used by root project.
+				if !contains(depgraphPkgs, pkg) {
+					continue
+				}
+
 				// Iterate through the external imports and check if they
 				// import any package from the target project.
 				for _, p := range ie.External {

cmd/dep/testdata/harness_tests/status/project_status/stdout.txt

@@ -13,7 +13,6 @@ SOURCE TYPE:              git
 PACKAGES:                 github.com/sdboyer/deptest
 PROJECT IMPORTERS:        github.com/darkowlzz/deptest-project-status, github.com/sdboyer/deptestdos
 PACKAGE IMPORTERS:        github.com/sdboyer/deptest
-                            github.com/darkowlzz/deptest-project-status/pkgbar
                             github.com/darkowlzz/deptest-project-status/pkgfoo
                             github.com/sdboyer/deptestdos
 UPSTREAM EXISTS:          yes