Add additions and deletions stats to commit file response (#1015)

app/api/controller/repo/commit.go

@@ -160,5 +160,6 @@ func (c *Controller) CommitFiles(ctx context.Context,
 	return types.CommitFilesResponse{
 		CommitID:       commit.CommitID,
 		RuleViolations: violations,
+		Stats:          commit.Stats,
 	}, nil, nil
 }

app/api/controller/space/export.go

@@ -60,7 +60,8 @@ func (c *Controller) Export(ctx context.Context, session *auth.Session, spaceRef
 	var repos []*types.Repository
 	page := 1
 	for {
-		reposInPage, err := c.repoStore.List(ctx, space.ID, &types.RepoFilter{Size: 200, Page: page, Order: enum.OrderDesc})
+		reposInPage, err := c.repoStore.List(
+			ctx, space.ID, &types.RepoFilter{Size: 200, Page: page, Order: enum.OrderDesc})
 		if err != nil {
 			return err
 		}

git/diff.go

@@ -20,9 +20,12 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"regexp"
+	"strconv"
 	"sync"
 
 	"github.com/harness/gitness/errors"
+	"github.com/harness/gitness/git/command"
 	"github.com/harness/gitness/git/diff"
 	"github.com/harness/gitness/git/enum"
 	"github.com/harness/gitness/git/types"
@@ -30,6 +33,26 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
+// Parse "1 file changed, 3 insertions(+), 3 deletions(-)" for nums.
+var shortStatsRegexp = regexp.MustCompile(
+	`files? changed(?:, (\d+) insertions?\(\+\))?(?:, (\d+) deletions?\(-\))?`)
+
+type CommitShortStatParams struct {
+	Path string
+	Ref  string
+}
+
+func (p CommitShortStatParams) Validate() error {
+	if p.Path == "" {
+		return errors.InvalidArgument("path cannot be empty")
+	}
+
+	if p.Ref == "" {
+		return errors.InvalidArgument("ref cannot be empty")
+	}
+	return nil
+}
+
 type DiffParams struct {
 	ReadParams
 	BaseRef      string
@@ -177,6 +200,69 @@ func (s *Service) DiffStats(ctx context.Context, params *DiffParams) (DiffStatsO
 	}, nil
 }
 
+func parseCommitShortStat(statBuffer *bytes.Buffer) (CommitShortStatOutput, error) {
+	matches := shortStatsRegexp.FindStringSubmatch(statBuffer.String())
+	if len(matches) != 3 {
+		return CommitShortStatOutput{}, errors.Internal(errors.New("failed to match stats line"), "")
+	}
+
+	var stat CommitShortStatOutput
+
+	// if there are insertions; no insertions case: "1 file changed, 3 deletions(-)"
+	if len(matches[1]) > 0 {
+		if value, err := strconv.Atoi(matches[1]); err == nil {
+			stat.Additions = value
+		} else {
+			return CommitShortStatOutput{}, fmt.Errorf("failed to parse additions stats: %w", err)
+		}
+	}
+
+	// if there are deletions; no deletions case: "1 file changed, 3 insertions(+)"
+	if len(matches[2]) > 0 {
+		if value, err := strconv.Atoi(matches[2]); err == nil {
+			stat.Deletions = value
+		} else {
+			return CommitShortStatOutput{}, fmt.Errorf("failed to parse deletions stats: %w", err)
+		}
+	}
+
+	return stat, nil
+}
+
+type CommitShortStatOutput struct {
+	Additions int
+	Deletions int
+}
+
+func (s *Service) CommitShortStat(
+	ctx context.Context,
+	params *CommitShortStatParams,
+) (CommitShortStatOutput, error) {
+	if err := params.Validate(); err != nil {
+		return CommitShortStatOutput{}, err
+	}
+	// git log -1 --shortstat --pretty=format:""
+	cmd := command.New(
+		"log",
+		command.WithFlag("-1"),
+		command.WithFlag("--shortstat"),
+		command.WithFlag(`--pretty=format:""`),
+		command.WithArg(params.Ref),
+	)
+
+	stdout := bytes.NewBuffer(nil)
+	if err := cmd.Run(ctx, command.WithDir(params.Path), command.WithStdout(stdout)); err != nil {
+		return CommitShortStatOutput{}, errors.Internal(err, "failed to show stats")
+	}
+
+	stat, err := parseCommitShortStat(stdout)
+	if err != nil {
+		return CommitShortStatOutput{}, errors.Internal(err, "failed to parse stats line")
+	}
+
+	return stat, nil
+}
+
 type GetDiffHunkHeadersParams struct {
 	ReadParams
 	SourceCommitSHA string

git/interface.go

@@ -74,6 +74,7 @@ type Interface interface {
 	CommitDiff(ctx context.Context, params *GetCommitParams, w io.Writer) error
 	DiffShortStat(ctx context.Context, params *DiffParams) (DiffShortStatOutput, error)
 	DiffStats(ctx context.Context, params *DiffParams) (DiffStatsOutput, error)
+	CommitShortStat(ctx context.Context, params *CommitShortStatParams) (CommitShortStatOutput, error)
 
 	GetDiffHunkHeaders(ctx context.Context, params GetDiffHunkHeadersParams) (GetDiffHunkHeadersOutput, error)
 	DiffCut(ctx context.Context, params *DiffCutParams) (DiffCutOutput, error)

git/operations.go

@@ -87,7 +87,14 @@ func (p *CommitFilesParams) Validate() error {
 	return p.WriteParams.Validate()
 }
 
+type CommitFileStat struct {
+	Total     int
+	Additions int
+	Deletions int
+}
+
 type CommitFilesResponse struct {
+	Stats    CommitFileStat
 	CommitID string
 }
 
@@ -235,6 +242,14 @@ func (s *Service) CommitFiles(ctx context.Context, params *CommitFilesParams) (C
 
 	log.Debug().Msg("update ref")
 
+	stats, err := s.CommitShortStat(ctx, &CommitShortStatParams{
+		Path: repo.Path,
+		Ref:  newCommitSHA,
+	})
+	if err != nil {
+		return CommitFilesResponse{}, fmt.Errorf("failed to get diff stats: %w", err)
+	}
+
 	branchRef := adapter.GetReferenceFromBranchName(params.Branch)
 	if params.Branch != params.NewBranch {
 		// we are creating a new branch, rather than updating the existing one
@@ -264,6 +279,11 @@ func (s *Service) CommitFiles(ctx context.Context, params *CommitFilesParams) (C
 
 	return CommitFilesResponse{
 		CommitID: commit.ID.String(),
+		Stats: CommitFileStat{
+			Total:     stats.Additions + stats.Deletions,
+			Additions: stats.Additions,
+			Deletions: stats.Deletions,
+		},
 	}, nil
 }
 

types/commit.go

@@ -14,9 +14,12 @@
 
 package types
 
+import "github.com/harness/gitness/git"
+
 // CommitFilesResponse holds commit id.
 type CommitFilesResponse struct {
-	DryRunRules    bool             `json:"dry_run_rules,omitempty"`
-	CommitID       string           `json:"commit_id"`
-	RuleViolations []RuleViolations `json:"rule_violations,omitempty"`
+	DryRunRules    bool               `json:"dry_run_rules,omitempty"`
+	CommitID       string             `json:"commit_id"`
+	RuleViolations []RuleViolations   `json:"rule_violations,omitempty"`
+	Stats          git.CommitFileStat `json:"stats,omitempty"`
 }