1 files changed, 151 insertions, 0 deletions
diff --git a/modules/git/repo_stats.go b/modules/git/repo_stats.go
new file mode 100644
index 0000000..8322010
--- /dev/null
+++ b/modules/git/repo_stats.go
@@ -0,0 +1,151 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"os"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"code.gitea.io/gitea/modules/container"
+)
+
+// CodeActivityStats represents git statistics data
+type CodeActivityStats struct {
+	AuthorCount              int64
+	CommitCount              int64
+	ChangedFiles             int64
+	Additions                int64
+	Deletions                int64
+	CommitCountInAllBranches int64
+	Authors                  []*CodeActivityAuthor
+}
+
+// CodeActivityAuthor represents git statistics data for commit authors
+type CodeActivityAuthor struct {
+	Name    string
+	Email   string
+	Commits int64
+}
+
+// GetCodeActivityStats returns code statistics for activity page
+func (repo *Repository) GetCodeActivityStats(fromTime time.Time, branch string) (*CodeActivityStats, error) {
+	stats := &CodeActivityStats{}
+
+	since := fromTime.Format(time.RFC3339)
+
+	stdout, _, runErr := NewCommand(repo.Ctx, "rev-list", "--count", "--no-merges", "--branches=*", "--date=iso").AddOptionFormat("--since='%s'", since).RunStdString(&RunOpts{Dir: repo.Path})
+	if runErr != nil {
+		return nil, runErr
+	}
+
+	c, err := strconv.ParseInt(strings.TrimSpace(stdout), 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	stats.CommitCountInAllBranches = c
+
+	stdoutReader, stdoutWriter, err := os.Pipe()
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
+		_ = stdoutReader.Close()
+		_ = stdoutWriter.Close()
+	}()
+
+	gitCmd := NewCommand(repo.Ctx, "log", "--numstat", "--no-merges", "--pretty=format:---%n%h%n%aN%n%aE%n", "--date=iso").AddOptionFormat("--since='%s'", since)
+	if len(branch) == 0 {
+		gitCmd.AddArguments("--branches=*")
+	} else {
+		gitCmd.AddArguments("--first-parent").AddDynamicArguments(branch)
+	}
+
+	stderr := new(strings.Builder)
+	err = gitCmd.Run(&RunOpts{
+		Env:    []string{},
+		Dir:    repo.Path,
+		Stdout: stdoutWriter,
+		Stderr: stderr,
+		PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
+			_ = stdoutWriter.Close()
+			scanner := bufio.NewScanner(stdoutReader)
+			scanner.Split(bufio.ScanLines)
+			stats.CommitCount = 0
+			stats.Additions = 0
+			stats.Deletions = 0
+			authors := make(map[string]*CodeActivityAuthor)
+			files := make(container.Set[string])
+			var author string
+			p := 0
+			for scanner.Scan() {
+				l := strings.TrimSpace(scanner.Text())
+				if l == "---" {
+					p = 1
+				} else if p == 0 {
+					continue
+				} else {
+					p++
+				}
+				if p > 4 && len(l) == 0 {
+					continue
+				}
+				switch p {
+				case 1: // Separator
+				case 2: // Commit sha-1
+					stats.CommitCount++
+				case 3: // Author
+					author = l
+				case 4: // E-mail
+					email := strings.ToLower(l)
+					if _, ok := authors[email]; !ok {
+						authors[email] = &CodeActivityAuthor{Name: author, Email: email, Commits: 0}
+					}
+					authors[email].Commits++
+				default: // Changed file
+					if parts := strings.Fields(l); len(parts) >= 3 {
+						if parts[0] != "-" {
+							if c, err := strconv.ParseInt(strings.TrimSpace(parts[0]), 10, 64); err == nil {
+								stats.Additions += c
+							}
+						}
+						if parts[1] != "-" {
+							if c, err := strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 64); err == nil {
+								stats.Deletions += c
+							}
+						}
+						files.Add(parts[2])
+					}
+				}
+			}
+			if err = scanner.Err(); err != nil {
+				_ = stdoutReader.Close()
+				return fmt.Errorf("GetCodeActivityStats scan: %w", err)
+			}
+			a := make([]*CodeActivityAuthor, 0, len(authors))
+			for _, v := range authors {
+				a = append(a, v)
+			}
+			// Sort authors descending depending on commit count
+			sort.Slice(a, func(i, j int) bool {
+				return a[i].Commits > a[j].Commits
+			})
+			stats.AuthorCount = int64(len(authors))
+			stats.ChangedFiles = int64(len(files))
+			stats.Authors = a
+			_ = stdoutReader.Close()
+			return nil
+		},
+	})
+	if err != nil {
+		return nil, fmt.Errorf("Failed to get GetCodeActivityStats for repository.\nError: %w\nStderr: %s", err, stderr)
+	}
+
+	return stats, nil
+}