Initial work for status old

cmd/dep/status.go

@@ -6,6 +6,7 @@ package main
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"flag"
 	"fmt"
@@ -242,8 +243,6 @@ func (cmd *statusCommand) Run(ctx *dep.Ctx, args []string) error {
 	switch {
 	case cmd.missing:
 		return errors.Errorf("not implemented")
-	case cmd.old:
-		return errors.Errorf("not implemented")
 	case cmd.json:
 		out = &jsonOutput{
 			w: &buf,
@@ -274,7 +273,7 @@ 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)
+	hasMissingPkgs, errCount, err := runStatusAll(ctx, out, p, sm, cmd)
 	if err != nil {
 		switch err {
 		case errFailedUpdate:
@@ -341,6 +340,15 @@ 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+// OldStatus contains information about all the out of date packages in a project.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
@@ -424,7 +432,7 @@ type MissingStatus struct {
 	MissingPackages []string
 }
 
-func runStatusAll(ctx *dep.Ctx, out outputter, p *dep.Project, sm gps.SourceManager) (hasMissingPkgs bool, errCount int, err error) {
+func runStatusAll(ctx *dep.Ctx, out outputter, p *dep.Project, sm gps.SourceManager, cmd *statusCommand) (hasMissingPkgs bool, errCount int, err error) {
 	// While the network churns on ListVersions() requests, statically analyze
 	// code from the current project.
 	ptree, err := p.ParseRootPackageTree()
@@ -457,6 +465,17 @@ 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)
@@ -641,7 +660,18 @@ func runStatusAll(ctx *dep.Ctx, out outputter, p *dep.Project, sm gps.SourceMana
 
 		// Use the collected BasicStatus in outputter.
 		for _, proj := range slp {
-			if err := out.BasicLine(bsMap[string(proj.Ident().ProjectRoot)]); err != nil {
+			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
 			}
 		}
@@ -722,6 +752,20 @@ outer:
 	return hasMissingPkgs, 0, errInputDigestMismatch
 }
 
+// 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()
+	for i := range solutionProjects {
+		if solutionProjects[i].Ident().ProjectRoot == p.Ident().ProjectRoot {
+			spr, _, _ := gps.VersionComponentStrings(solutionProjects[i].Version())
+			lpr, _, _ := gps.VersionComponentStrings(p.Version())
+			return spr == lpr, nil
+		}
+	}
+	// If we're here, the solution was missing a project. Should never get here but just incase
+	return false, errors.New("solution missing project information for " + string(p.Ident().ProjectRoot))
+}
+
 func formatVersion(v gps.Version) string {
 	if v == nil {
 		return ""