Add tests and put command in own function

Added unit test for projUpToDate and harness test for the -old flag.
Put the status -old functionality to it's own function.

cmd/dep/status.go

@@ -273,7 +273,16 @@ func (cmd *statusCommand) Run(ctx *dep.Ctx, args []string) error {
 		return errors.Errorf("no Gopkg.lock found. Run `dep ensure` to generate lock file")
 	}
 
-	hasMissingPkgs, errCount, err := runStatusAll(ctx, out, p, sm, cmd)
+	// Choose function based on command options
+	var hasMissingPkgs bool
+	var errCount int
+	switch {
+	case cmd.old:
+		hasMissingPkgs, errCount, err = runOld(ctx, out, p, sm)
+	default:
+		hasMissingPkgs, errCount, err = runStatusAll(ctx, out, p, sm)
+	}
+
 	if err != nil {
 		switch err {
 		case errFailedUpdate:
@@ -340,15 +349,6 @@ func (cmd *statusCommand) validateFlags() error {
 	return nil
 }
 
-// OldStatus contains information about all the out of date packages in a project.
-type OldStatus struct {
-	ProjectRoot string
-	Constraint  gps.Constraint
-	Version     gps.UnpairedVersion
-	Revision    gps.Revision
-	Latest      gps.Version
-}
-
 type rawStatus struct {
 	ProjectRoot  string
 	Constraint   string
@@ -432,7 +432,7 @@ type MissingStatus struct {
 	MissingPackages []string
 }
 
-func runStatusAll(ctx *dep.Ctx, out outputter, p *dep.Project, sm gps.SourceManager, cmd *statusCommand) (hasMissingPkgs bool, errCount int, err error) {
+func runStatusAll(ctx *dep.Ctx, out outputter, p *dep.Project, sm gps.SourceManager) (hasMissingPkgs bool, errCount int, err error) {
 	// While the network churns on ListVersions() requests, statically analyze
 	// code from the current project.
 	ptree, err := p.ParseRootPackageTree()
@@ -465,17 +465,6 @@ func runStatusAll(ctx *dep.Ctx, out outputter, p *dep.Project, sm gps.SourceMana
 		return false, 0, errors.Wrapf(err, "could not set up solver for input hashing")
 	}
 
-	// We only care about solution in the -old flag case
-	var solution gps.Solution
-	if cmd.old {
-		params.ChangeAll = true
-		var err error
-		solution, err = s.Solve(context.TODO())
-		if err != nil {
-			return false, 0, err
-		}
-	}
-
 	// Errors while collecting constraints should not fail the whole status run.
 	// It should count the error and tell the user about incomplete results.
 	cm, ccerrs := collectConstraints(ctx, p, sm)
@@ -662,15 +651,6 @@ func runStatusAll(ctx *dep.Ctx, out outputter, p *dep.Project, sm gps.SourceMana
 		for _, proj := range slp {
 			pr := proj.Ident().ProjectRoot
 
-			// If -old flag, only display the lines where the solver mismatches
-			if cmd.old {
-				if matches, err := projUpToDate(proj, solution); matches {
-					continue
-				} else if err != nil {
-					return false, 0, err
-				}
-			}
-
 			if err := out.BasicLine(bsMap[string(pr)]); err != nil {
 				return false, 0, err
 			}
@@ -752,9 +732,223 @@ outer:
 	return hasMissingPkgs, 0, errInputDigestMismatch
 }
 
+func runOld(ctx *dep.Ctx, out outputter, p *dep.Project, sm gps.SourceManager) (hasMissingPkgs bool, errCount int, err error) {
+	ptree, err := p.ParseRootPackageTree()
+	if err != nil {
+		return false, 0, err
+	}
+
+	// Solve the dependencies so we can check if the current dependencies are old
+	params := gps.SolveParameters{
+		ProjectAnalyzer: dep.Analyzer{},
+		RootDir:         p.AbsRoot,
+		RootPackageTree: ptree,
+		Manifest:        p.Manifest,
+		ChangeAll:       true,
+	}
+	s, err := gps.Prepare(params, sm)
+	if err != nil {
+		return false, 0, errors.Wrapf(err, "could not set up solver for input hashing")
+	}
+
+	if err := out.BasicHeader(); err != nil {
+		return false, 0, err
+	}
+
+	// Errors while collecting constraints should not fail the whole status run.
+	// It should count the error and tell the user about incomplete results.
+	cm, ccerrs := collectConstraints(ctx, p, sm)
+	if len(ccerrs) > 0 {
+		errCount += len(ccerrs)
+	}
+
+	bsMap := make(map[string]*BasicStatus)
+
+	slp := p.Lock.Projects()
+
+	if !bytes.Equal(s.HashInputs(), p.Lock.SolveMeta.InputsDigest) {
+		// Hash digest mismatch may indicate that some deps are no longer
+		// needed, some are missing, or that some constraints or source
+		// locations have changed.
+		//
+		// It's possible for digests to not match, but still have a correct
+		// lock.
+		rm, _ := ptree.ToReachMap(true, true, false, p.Manifest.IgnoredPackages())
+
+		external := rm.FlattenFn(paths.IsStandardImportPath)
+		roots := make(map[gps.ProjectRoot][]string, len(external))
+
+		type fail struct {
+			ex  string
+			err error
+		}
+		var errs []fail
+		for _, e := range external {
+			root, err := sm.DeduceProjectRoot(e)
+			if err != nil {
+				errs = append(errs, fail{
+					ex:  e,
+					err: err,
+				})
+				continue
+			}
+
+			roots[root] = append(roots[root], e)
+		}
+
+		if len(errs) != 0 {
+			// TODO this is just a fix quick so staticcheck doesn't complain.
+			// Visually reconciling failure to deduce project roots with the rest of
+			// the mismatch output is a larger problem.
+			ctx.Err.Printf("Failed to deduce project roots for import paths:\n")
+			for _, fail := range errs {
+				ctx.Err.Printf("\t%s: %s\n", fail.ex, fail.err.Error())
+			}
+
+			return false, 0, errors.New("address issues with undeducible import paths to get more status information")
+		}
+
+		if err = out.MissingHeader(); err != nil {
+			return false, 0, err
+		}
+
+	outer2:
+		for root, pkgs := range roots {
+			// TODO also handle the case where the project is present, but there
+			// are items missing from just the package list
+			for _, lp := range slp {
+				if lp.Ident().ProjectRoot == root {
+					continue outer2
+				}
+			}
+
+			hasMissingPkgs = true
+			err := out.MissingLine(&MissingStatus{ProjectRoot: string(root), MissingPackages: pkgs})
+			if err != nil {
+				return false, 0, err
+			}
+		}
+		if err = out.MissingFooter(); err != nil {
+			return false, 0, err
+		}
+
+		// We are here because of an input-digest mismatch. Return error.
+		return hasMissingPkgs, 0, errInputDigestMismatch
+	}
+
+	solution, err := s.Solve(context.TODO())
+	if err != nil {
+		return false, 0, err
+	}
+
+	for _, proj := range slp {
+		if matches, err := projUpToDate(proj, solution.Projects()); matches {
+			continue
+		} else if err != nil {
+			return false, 0, err
+		}
+
+		bs := BasicStatus{
+			ProjectRoot:  string(proj.Ident().ProjectRoot),
+			PackageCount: len(proj.Packages()),
+		}
+		switch out.(type) {
+		case *dotOutput:
+			ptr, err := sm.ListPackages(proj.Ident(), proj.Version())
+
+			if err != nil {
+				bs.hasError = true
+				return false, 0, err
+			}
+
+			prm, _ := ptr.ToReachMap(true, true, false, p.Manifest.IgnoredPackages())
+			bs.Children = prm.FlattenFn(paths.IsStandardImportPath)
+		}
+		// Split apart the version from the lock into its constituent parts.
+		switch tv := proj.Version().(type) {
+		case gps.UnpairedVersion:
+			bs.Version = tv
+		case gps.Revision:
+			bs.Revision = tv
+		case gps.PairedVersion:
+			bs.Version = tv.Unpair()
+			bs.Revision = tv.Revision()
+		}
+		// Check if the manifest has an override for this project. If so,
+		// set that as the constraint.
+		if pp, has := p.Manifest.Ovr[proj.Ident().ProjectRoot]; has && pp.Constraint != nil {
+			bs.hasOverride = true
+			bs.Constraint = pp.Constraint
+		} else if pp, has := p.Manifest.Constraints[proj.Ident().ProjectRoot]; has && pp.Constraint != nil {
+			// If the manifest has a constraint then set that as the constraint.
+			bs.Constraint = pp.Constraint
+		} else {
+			bs.Constraint = gps.Any()
+			for _, c := range cm[bs.ProjectRoot] {
+				bs.Constraint = c.Constraint.Intersect(bs.Constraint)
+			}
+		}
+
+		// Only if we have a non-rev and non-plain version do/can we display
+		// anything wrt the version's updateability.
+		if bs.Version != nil && bs.Version.Type() != gps.IsVersion {
+			c, has := p.Manifest.Constraints[proj.Ident().ProjectRoot]
+			if !has {
+				// Get constraint for locked project
+				for _, lockedP := range p.Lock.P {
+					if lockedP.Ident().ProjectRoot == proj.Ident().ProjectRoot {
+						// Use the unpaired version as the constraint for checking updates.
+						c.Constraint = bs.Version
+					}
+				}
+			}
+			// TODO: This constraint is only the constraint imposed by the
+			// current project, not by any transitive deps. As a result,
+			// transitive project deps will always show "any" here.
+			bs.Constraint = c.Constraint
+
+			vl, err := sm.ListVersions(proj.Ident())
+			if err == nil {
+				gps.SortPairedForUpgrade(vl)
+
+				for _, v := range vl {
+					// Because we've sorted the version list for
+					// upgrade, the first version we encounter that
+					// matches our constraint will be what we want.
+					if c.Constraint.Matches(v) {
+						// Latest should be of the same type as the Version.
+						if bs.Version.Type() == gps.IsSemver {
+							bs.Latest = v
+						} else {
+							bs.Latest = v.Revision()
+						}
+						break
+					}
+				}
+			} else {
+				// Failed to fetch version list (could happen due to
+				// network issue).
+				bs.hasError = true
+				return false, 0, err
+			}
+		}
+
+		bsMap[bs.ProjectRoot] = &bs
+	}
+
+	for k := range bsMap {
+		if err := out.BasicLine(bsMap[k]); err != nil {
+			return false, 0, err
+		}
+	}
+	if footerErr := out.BasicFooter(); footerErr != nil {
+		return false, 0, footerErr
+	}
+	return false, errCount, err
+}
+
 // projUpToDate returns true if the project p, is at the same revision as what the solution indicates
-func projUpToDate(p gps.LockedProject, s gps.Solution) (bool, error) {
-	solutionProjects := s.Projects()
+func projUpToDate(p gps.LockedProject, solutionProjects []gps.LockedProject) (bool, error) {
 	for i := range solutionProjects {
 		if solutionProjects[i].Ident().ProjectRoot == p.Ident().ProjectRoot {
 			spr, _, _ := gps.VersionComponentStrings(solutionProjects[i].Version())

cmd/dep/status_test.go

@@ -38,6 +38,57 @@ func TestStatusFormatVersion(t *testing.T) {
 	}
 }
 
+func TestProjUpToDate(t *testing.T) {
+	deptestProj := gps.NewLockedProject(gps.ProjectIdentifier{ProjectRoot: "github.com/sdboyer/deptest"}, gps.NewVersion("1.0.0").Pair(gps.Revision("ff2948a2ac8f538c4ecd55962e919d1e13e74baf")), []string{})
+	deptestDosProj := gps.NewLockedProject(gps.ProjectIdentifier{ProjectRoot: "github.com/sdboyer/deptestdos"}, gps.NewVersion("2.0.0").Pair(gps.Revision("5c607206be5decd28e6263ffffdcee067266015e")), []string{})
+	goDepTestProj := gps.NewLockedProject(gps.ProjectIdentifier{ProjectRoot: "github.com/carolynvs/go-dep-test"}, gps.NewVersion("0.1.1").Pair(gps.Revision("40691983e4002d3a3f5879cc0f1fe99bedda148c")), []string{})
+
+	tests := []struct {
+		proj             gps.LockedProject
+		solutionProjects []gps.LockedProject
+		want             bool
+		wantErr          bool
+	}{
+		{
+			proj: gps.NewLockedProject(gps.ProjectIdentifier{ProjectRoot: "github.com/sdboyer/deptest"}, gps.NewVersion("1.0.0").Pair(gps.Revision("ff2948a2ac8f538c4ecd55962e919d1e13e74baf")), []string{}),
+			solutionProjects: []gps.LockedProject{
+				deptestProj, deptestDosProj, goDepTestProj,
+			},
+			want:    true,
+			wantErr: false,
+		},
+		{
+			proj: gps.NewLockedProject(gps.ProjectIdentifier{ProjectRoot: "github.com/carolynvs/go-dep-test"}, gps.NewVersion("0.1.0").Pair(gps.Revision("b9c5511fa463628e6251554db29a4be161d02aed")), []string{}),
+			solutionProjects: []gps.LockedProject{
+				deptestProj, deptestDosProj, goDepTestProj,
+			},
+			want:    false,
+			wantErr: false,
+		},
+		{
+			proj: gps.NewLockedProject(gps.ProjectIdentifier{ProjectRoot: "github.com/carolynvs/go-dep-test"}, gps.NewVersion("0.1.0").Pair(gps.Revision("b9c5511fa463628e6251554db29a4be161d02aed")), []string{}),
+			solutionProjects: []gps.LockedProject{
+				deptestProj, deptestDosProj,
+			},
+			want:    false,
+			wantErr: true,
+		},
+	}
+
+	for _, test := range tests {
+		got, err := projUpToDate(test.proj, test.solutionProjects)
+		if test.wantErr && err == nil {
+			t.Errorf("expecting error but didn't receive one")
+		}
+		if !test.wantErr && err != nil {
+			t.Errorf("unexpected error: \n\t(GOT): %v\n\t(WNT): nil", err.Error())
+		}
+		if test.want != got {
+			t.Errorf("returned incorrect result: \n\t(GOT): %v\n\t(WNT): %v", got, test.want)
+		}
+	}
+}
+
 func TestBasicLine(t *testing.T) {
 	project := dep.Project{}
 	aSemverConstraint, _ := gps.NewSemverConstraint("1.2.3")