gps: Refactor prune and filesystem functions

cmd/dep/ensure.go

@@ -265,7 +265,7 @@ func (cmd *ensureCommand) runDefault(ctx *dep.Ctx, args []string, p *dep.Project
 		// that "verification" is supposed to look like (#121); in the meantime,
 		// we unconditionally write out vendor/ so that `dep ensure`'s behavior
 		// is maximally compatible with what it will eventually become.
-		sw, err := dep.NewSafeWriter(nil, p.Lock, p.Lock, dep.VendorAlways)
+		sw, err := dep.NewSafeWriter(nil, p.Lock, p.Lock, dep.VendorAlways, p.Manifest.PruneOptions)
 		if err != nil {
 			return err
 		}
@@ -290,7 +290,7 @@ func (cmd *ensureCommand) runDefault(ctx *dep.Ctx, args []string, p *dep.Project
 		return handleAllTheFailuresOfTheWorld(err)
 	}
 
-	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), cmd.vendorBehavior())
+	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), cmd.vendorBehavior(), p.Manifest.PruneOptions)
 	if err != nil {
 		return err
 	}
@@ -315,7 +315,7 @@ func (cmd *ensureCommand) runVendorOnly(ctx *dep.Ctx, args []string, p *dep.Proj
 	}
 	// Pass the same lock as old and new so that the writer will observe no
 	// difference and choose not to write it out.
-	sw, err := dep.NewSafeWriter(nil, p.Lock, p.Lock, dep.VendorAlways)
+	sw, err := dep.NewSafeWriter(nil, p.Lock, p.Lock, dep.VendorAlways, p.Manifest.PruneOptions)
 	if err != nil {
 		return err
 	}
@@ -380,7 +380,7 @@ func (cmd *ensureCommand) runUpdate(ctx *dep.Ctx, args []string, p *dep.Project,
 		return handleAllTheFailuresOfTheWorld(err)
 	}
 
-	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), cmd.vendorBehavior())
+	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), cmd.vendorBehavior(), p.Manifest.PruneOptions)
 	if err != nil {
 		return err
 	}
@@ -679,7 +679,7 @@ func (cmd *ensureCommand) runAdd(ctx *dep.Ctx, args []string, p *dep.Project, sm
 	}
 	sort.Strings(reqlist)
 
-	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), dep.VendorOnChanged)
+	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), dep.VendorOnChanged, p.Manifest.PruneOptions)
 	if err != nil {
 		return err
 	}

cmd/dep/init.go

@@ -211,7 +211,7 @@ func (cmd *initCommand) Run(ctx *dep.Ctx, args []string) error {
 		ctx.Err.Printf("Old vendor backed up to %v", vendorbak)
 	}
 
-	sw, err := dep.NewSafeWriter(p.Manifest, nil, p.Lock, dep.VendorAlways)
+	sw, err := dep.NewSafeWriter(p.Manifest, nil, p.Lock, dep.VendorAlways, gps.DefaultRootPruneOptions())
 	if err != nil {
 		return errors.Wrap(err, "init failed: unable to create a SafeWriter")
 	}

cmd/dep/main.go

@@ -67,7 +67,6 @@ func (c *Config) Run() int {
 		&statusCommand{},
 		&ensureCommand{},
 		&hashinCommand{},
-		&pruneCommand{},
 		&versionCommand{},
 	}