Number of commits ahead/behind in branch overview (#6695)

* Call Git API to determine divergence of a branch and its base branch

Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>

* Show commit divergance in branch list

Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>

* Adds missing comment

Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>

* Adds test for diverging commits

Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>

* Try comparing commits instead of branches

Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>

* Removes test as CI can't run it

Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>

* Adjusts signature of percentage function to allow providing multiple integers as numerator

Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>

* Moves CountDivergingCommits function into repofiles module

Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>

modules/git/repo.go

@@ -9,9 +9,11 @@ import (
 	"bytes"
 	"container/list"
 	"errors"
+	"fmt"
 	"os"
 	"path"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"time"
 
@@ -306,3 +308,40 @@ func GetLatestCommitTime(repoPath string) (time.Time, error) {
 	commitTime := strings.TrimSpace(stdout)
 	return time.Parse(GitTimeLayout, commitTime)
 }
+
+// DivergeObject represents commit count diverging commits
+type DivergeObject struct {
+	Ahead  int
+	Behind int
+}
+
+func checkDivergence(repoPath string, baseBranch string, targetBranch string) (int, error) {
+	branches := fmt.Sprintf("%s..%s", baseBranch, targetBranch)
+	cmd := NewCommand("rev-list", "--count", branches)
+	stdout, err := cmd.RunInDir(repoPath)
+	if err != nil {
+		return -1, err
+	}
+	outInteger, errInteger := strconv.Atoi(strings.Trim(stdout, "\n"))
+	if errInteger != nil {
+		return -1, errInteger
+	}
+	return outInteger, nil
+}
+
+// GetDivergingCommits returns the number of commits a targetBranch is ahead or behind a baseBranch
+func GetDivergingCommits(repoPath string, baseBranch string, targetBranch string) (DivergeObject, error) {
+	// $(git rev-list --count master..feature) commits ahead of master
+	ahead, errorAhead := checkDivergence(repoPath, baseBranch, targetBranch)
+	if errorAhead != nil {
+		return DivergeObject{}, errorAhead
+	}
+
+	// $(git rev-list --count feature..master) commits behind master
+	behind, errorBehind := checkDivergence(repoPath, targetBranch, baseBranch)
+	if errorBehind != nil {
+		return DivergeObject{}, errorBehind
+	}
+
+	return DivergeObject{ahead, behind}, nil
+}

modules/repofiles/commit.go

@@ -0,0 +1,19 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package repofiles
+
+import (
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/git"
+)
+
+// CountDivergingCommits determines how many commits a branch is ahead or behind the repository's base branch
+func CountDivergingCommits(repo *models.Repository, branch string) (*git.DivergeObject, error) {
+	divergence, err := git.GetDivergingCommits(repo.RepoPath(), repo.DefaultBranch, branch)
+	if err != nil {
+		return nil, err
+	}
+	return &divergence, nil
+}

modules/templates/helper.go

@@ -223,6 +223,13 @@ func NewFuncMap() []template.FuncMap {
 			}
 			return dict, nil
 		},
+		"percentage": func(n int, values ...int) float32 {
+			var sum = 0
+			for i := 0; i < len(values); i++ {
+				sum += values[i]
+			}
+			return float32(n) * 100 / float32(sum)
+		},
 	}}
 }
 

public/less/_repository.less

@@ -963,6 +963,42 @@
         margin-top: 1px!important;
     }
 
+    &.branches {
+        .commit-divergence {
+            .bar-group {
+                position: relative;
+                float: left;
+                padding-bottom: 6px;
+                width: 90px;
+
+                &:last-child {
+                    border-left: 1px solid #b4b4b4;
+                }
+            }
+            .count {
+                margin: 0 3px;
+                &.count-ahead {
+                    text-align: left;
+                }
+                &.count-behind {
+                    text-align: right;
+                }
+            }
+            .bar {
+                height: 4px;
+                position: absolute;
+                background-color: #d4d4d5;
+
+                &.bar-behind {
+                    right: 0;
+                }
+                &.bar-ahead {
+                    left: 0;
+                }
+            }
+        }
+    }
+
     &.commits {
         .header {
             .search {

routers/repo/branch.go

@@ -14,6 +14,7 @@ import (
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/repofiles"
 	"code.gitea.io/gitea/modules/util"
 )
 
@@ -28,6 +29,8 @@ type Branch struct {
 	IsProtected   bool
 	IsDeleted     bool
 	DeletedBranch *models.DeletedBranch
+	CommitsAhead  int
+	CommitsBehind int
 }
 
 // Branches render repository branch page
@@ -168,16 +171,25 @@ func loadBranches(ctx *context.Context) []*Branch {
 			return nil
 		}
 
-		isProtected, err := ctx.Repo.Repository.IsProtectedBranch(rawBranches[i].Name, ctx.User)
+		branchName := rawBranches[i].Name
+		isProtected, err := ctx.Repo.Repository.IsProtectedBranch(branchName, ctx.User)
 		if err != nil {
 			ctx.ServerError("IsProtectedBranch", err)
 			return nil
 		}
 
+		divergence, divergenceError := repofiles.CountDivergingCommits(ctx.Repo.Repository, branchName)
+		if divergenceError != nil {
+			ctx.ServerError("CountDivergingCommits", divergenceError)
+			return nil
+		}
+
 		branches[i] = &Branch{
-			Name:        rawBranches[i].Name,
+			Name:          branchName,
-			Commit:      commit,
+			Commit:        commit,
-			IsProtected: isProtected,
+			IsProtected:   isProtected,
+			CommitsAhead:  divergence.Ahead,
+			CommitsBehind: divergence.Behind,
 		}
 	}
 

templates/repo/branch/list.tmpl

@@ -26,7 +26,8 @@
 				<table class="ui very basic striped fixed table single line">
 					<thead>
 						<tr>
-							<th class="nine wide">{{.i18n.Tr "repo.branch.name"}}</th>
+							<th class="seven wide">{{.i18n.Tr "repo.branch.name"}}</th>
+							<th class="two wide"></th>
 							{{if and $.IsWriter (not $.IsMirror)}}
 								<th class="one wide right aligned">{{.i18n.Tr "repo.branch.delete_head"}}</th>
 							{{end}}
@@ -45,6 +46,18 @@
 										<p class="time">{{$.i18n.Tr "org.repo_updated"}} {{TimeSince .Commit.Committer.When $.i18n.Lang}}</p>
 									</td>
 									{{end}}
+									<td class="ui">
+										<div class="commit-divergence">
+											<div class="bar-group">
+												<div class="count count-behind">{{.CommitsBehind}}</div>
+												<div class="bar bar-behind" style="width: {{percentage .CommitsBehind .CommitsBehind .CommitsAhead}}%"></div>
+											</div>
+											<div class="bar-group">
+												<div class="count count-ahead">{{.CommitsAhead}}</div>
+                                            	<div class="bar bar-ahead" style="width: {{percentage .CommitsAhead .CommitsBehind .CommitsAhead}}%"></div>
+											</div>
+										</div>
+									</td>
 									{{if and $.IsWriter (not $.IsMirror)}}
 										<td class="right aligned">
 										{{if .IsProtected}}