Adds side-by-side diff for images (#6784)

* Adds side-by-side diff for images

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

* Explain blank imports

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

* Use complete word for width and height labels on image compare

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

* Update index.css from master

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

* Moves ImageInfo to git commit file

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

* Assign ImageInfo function for template and sets correct target for BeforeSourcePath

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

* Adds missing comment

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

* Return error if ImageInfo failed

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

* Avoid template panic when ImageInfo failed for some reason

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

* Show file size on image diff

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

* Removes unused helper function

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

* Reverts copyright year change

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

* Close file reader

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

* Update commit.go

Sets correct data key

* Moves reader.Close() up a few lines

* Updates index.css

* Updates CSS file

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

* Transfers adjustments for image compare to compare.go file

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

* Adjusts variable name

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

* Apply lesshint recommendations

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

* Do not show old image on image compare if it is not in index of base commit

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

* Change file size text

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

1 files changed, 53 insertions, 1 deletions

diff --git a/routers/repo/compare.go b/routers/repo/compare.go
index 4f9a918a7c..7c55dfca30 100644
--- a/routers/repo/compare.go
+++ b/routers/repo/compare.go
@@ -247,6 +247,26 @@ func PrepareCompareDiff(
 		return false
 	}
 
+	baseGitRepo := ctx.Repo.GitRepo
+	baseCommitID := baseBranch
+	if ctx.Data["BaseIsCommit"] == false {
+		if ctx.Data["BaseIsTag"] == true {
+			baseCommitID, err = baseGitRepo.GetTagCommitID(baseBranch)
+		} else {
+			baseCommitID, err = baseGitRepo.GetBranchCommitID(baseBranch)
+		}
+		if err != nil {
+			ctx.ServerError("GetRefCommitID", err)
+			return false
+		}
+	}
+
+	baseCommit, err := baseGitRepo.GetCommit(baseCommitID)
+	if err != nil {
+		ctx.ServerError("GetCommit", err)
+		return false
+	}
+
 	compareInfo.Commits = models.ValidateCommitsWithEmails(compareInfo.Commits)
 	compareInfo.Commits = models.ParseCommitsWithSignature(compareInfo.Commits)
 	compareInfo.Commits = models.ParseCommitsWithStatus(compareInfo.Commits, headRepo)
@@ -272,11 +292,43 @@ func PrepareCompareDiff(
 	ctx.Data["Username"] = headUser.Name
 	ctx.Data["Reponame"] = headRepo.Name
 	ctx.Data["IsImageFile"] = headCommit.IsImageFile
+	ctx.Data["ImageInfo"] = func(name string) *git.ImageMetaData {
+		result, err := headCommit.ImageInfo(name)
+		if err != nil {
+			log.Error("ImageInfo failed: %v", err)
+			return nil
+		}
+		return result
+	}
+	ctx.Data["FileExistsInBaseCommit"] = func(filename string) bool {
+		result, err := baseCommit.HasFile(filename)
+		if err != nil {
+			log.Error(
+				"Error while checking if file \"%s\" exists in base commit \"%s\" (repo: %s): %v",
+				filename,
+				baseCommit,
+				baseGitRepo.Path,
+				err)
+			return false
+		}
+		return result
+	}
+	ctx.Data["ImageInfoBase"] = func(name string) *git.ImageMetaData {
+		result, err := baseCommit.ImageInfo(name)
+		if err != nil {
+			log.Error("ImageInfo failed: %v", err)
+			return nil
+		}
+		return result
+	}
 
 	headTarget := path.Join(headUser.Name, repo.Name)
+	baseTarget := path.Join(ctx.Repo.Owner.Name, ctx.Repo.Repository.Name)
 	ctx.Data["SourcePath"] = setting.AppSubURL + "/" + path.Join(headTarget, "src", "commit", headCommitID)
-	ctx.Data["BeforeSourcePath"] = setting.AppSubURL + "/" + path.Join(headTarget, "src", "commit", compareInfo.MergeBase)
 	ctx.Data["RawPath"] = setting.AppSubURL + "/" + path.Join(headTarget, "raw", "commit", headCommitID)
+	ctx.Data["BeforeSourcePath"] = setting.AppSubURL + "/" + path.Join(baseTarget, "src", "commit", baseCommitID)
+	ctx.Data["BeforeRawPath"] = setting.AppSubURL + "/" + path.Join(baseTarget, "raw", "commit", baseCommitID)
+
 	return false
 }