feat(third_party): Check in git-appraise

third_party/go/git-appraise/commands/rebase.go

@@ -0,0 +1,100 @@
+/*
+Copyright 2016 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package commands
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+
+	"github.com/google/git-appraise/repository"
+	"github.com/google/git-appraise/review"
+)
+
+var rebaseFlagSet = flag.NewFlagSet("rebase", flag.ExitOnError)
+
+var (
+	rebaseArchive = rebaseFlagSet.Bool("archive", true, "Prevent the original commit from being garbage collected.")
+	rebaseSign    = rebaseFlagSet.Bool("S", false,
+		"Sign the contents of the request after the rebase")
+)
+
+// Validate that the user's request to rebase a review makes sense.
+//
+// This checks both that the request is well formed, and that the
+// corresponding review is in a state where rebasing is appropriate.
+func validateRebaseRequest(repo repository.Repo, args []string) (*review.Review, error) {
+	var r *review.Review
+	var err error
+	if len(args) > 1 {
+		return nil, errors.New("Only rebasing a single review is supported.")
+	}
+	if len(args) == 1 {
+		r, err = review.Get(repo, args[0])
+	} else {
+		r, err = review.GetCurrent(repo)
+	}
+	if err != nil {
+		return nil, fmt.Errorf("Failed to load the review: %v\n", err)
+	}
+	if r == nil {
+		return nil, errors.New("There is no matching review.")
+	}
+
+	if r.Submitted {
+		return nil, errors.New("The review has already been submitted.")
+	}
+
+	if r.Request.TargetRef == "" {
+		return nil, errors.New("The review was abandoned.")
+	}
+
+	target := r.Request.TargetRef
+	if err := repo.VerifyGitRef(target); err != nil {
+		return nil, err
+	}
+
+	return r, nil
+}
+
+// Rebase the current code review.
+//
+// The "args" parameter contains all of the command line arguments that followed the subcommand.
+func rebaseReview(repo repository.Repo, args []string) error {
+	rebaseFlagSet.Parse(args)
+	args = rebaseFlagSet.Args()
+
+	r, err := validateRebaseRequest(repo, args)
+	if err != nil {
+		return err
+	}
+	if *rebaseSign {
+		return r.RebaseAndSign(*rebaseArchive)
+	}
+	return r.Rebase(*rebaseArchive)
+}
+
+// rebaseCmd defines the "rebase" subcommand.
+var rebaseCmd = &Command{
+	Usage: func(arg0 string) {
+		fmt.Printf("Usage: %s rebase [<option>...] [<review-hash>]\n\nOptions:\n", arg0)
+		rebaseFlagSet.PrintDefaults()
+	},
+	RunMethod: func(repo repository.Repo, args []string) error {
+		return rebaseReview(repo, args)
+	},
+}