gitea/routers/web/repo/compare.go
zeripath fd15fd4c67
Handle too long PR titles correctly (#16517)
The CompareAndPullRequestPost handler for POST to /compare
incorrectly handles returning errors to the user. For a start
it does not set the necessary markers to switch SimpleMDE
but it also does not immediately return to the form.

This PR fixes this by setting the appropriate values, fixing
the templates and preventing the suggestion of a too long
title.

Fix #16507

Signed-off-by: Andrew Thornton <art27@cantab.net>
2021-07-25 03:59:27 +01:00

805 lines
24 KiB
Go

// 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 repo
import (
"bufio"
"encoding/csv"
"errors"
"fmt"
"html"
"net/http"
"path"
"path/filepath"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/charset"
"code.gitea.io/gitea/modules/context"
csv_module "code.gitea.io/gitea/modules/csv"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/upload"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/services/gitdiff"
)
const (
tplCompare base.TplName = "repo/diff/compare"
tplBlobExcerpt base.TplName = "repo/diff/blob_excerpt"
)
// setCompareContext sets context data.
func setCompareContext(ctx *context.Context, base *git.Commit, head *git.Commit, headTarget string) {
ctx.Data["BaseCommit"] = base
ctx.Data["HeadCommit"] = head
ctx.Data["GetBlobByPathForCommit"] = func(commit *git.Commit, path string) *git.Blob {
if commit == nil {
return nil
}
blob, err := commit.GetBlobByPath(path)
if err != nil {
return nil
}
return blob
}
setPathsCompareContext(ctx, base, head, headTarget)
setImageCompareContext(ctx)
setCsvCompareContext(ctx)
}
// setPathsCompareContext sets context data for source and raw paths
func setPathsCompareContext(ctx *context.Context, base *git.Commit, head *git.Commit, headTarget string) {
sourcePath := setting.AppSubURL + "/%s/src/commit/%s"
rawPath := setting.AppSubURL + "/%s/raw/commit/%s"
ctx.Data["SourcePath"] = fmt.Sprintf(sourcePath, headTarget, head.ID)
ctx.Data["RawPath"] = fmt.Sprintf(rawPath, headTarget, head.ID)
if base != nil {
baseTarget := path.Join(ctx.Repo.Owner.Name, ctx.Repo.Repository.Name)
ctx.Data["BeforeSourcePath"] = fmt.Sprintf(sourcePath, baseTarget, base.ID)
ctx.Data["BeforeRawPath"] = fmt.Sprintf(rawPath, baseTarget, base.ID)
}
}
// setImageCompareContext sets context data that is required by image compare template
func setImageCompareContext(ctx *context.Context) {
ctx.Data["IsBlobAnImage"] = func(blob *git.Blob) bool {
if blob == nil {
return false
}
st, err := blob.GuessContentType()
if err != nil {
log.Error("GuessContentType failed: %v", err)
return false
}
return st.IsImage() && (setting.UI.SVG.Enabled || !st.IsSvgImage())
}
}
// setCsvCompareContext sets context data that is required by the CSV compare template
func setCsvCompareContext(ctx *context.Context) {
ctx.Data["IsCsvFile"] = func(diffFile *gitdiff.DiffFile) bool {
extension := strings.ToLower(filepath.Ext(diffFile.Name))
return extension == ".csv" || extension == ".tsv"
}
type CsvDiffResult struct {
Sections []*gitdiff.TableDiffSection
Error string
}
ctx.Data["CreateCsvDiff"] = func(diffFile *gitdiff.DiffFile, baseCommit *git.Commit, headCommit *git.Commit) CsvDiffResult {
if diffFile == nil || baseCommit == nil || headCommit == nil {
return CsvDiffResult{nil, ""}
}
errTooLarge := errors.New(ctx.Locale.Tr("repo.error.csv.too_large"))
csvReaderFromCommit := func(c *git.Commit) (*csv.Reader, error) {
blob, err := c.GetBlobByPath(diffFile.Name)
if err != nil {
return nil, err
}
if setting.UI.CSV.MaxFileSize != 0 && setting.UI.CSV.MaxFileSize < blob.Size() {
return nil, errTooLarge
}
reader, err := blob.DataAsync()
if err != nil {
return nil, err
}
defer reader.Close()
return csv_module.CreateReaderAndGuessDelimiter(charset.ToUTF8WithFallbackReader(reader))
}
baseReader, err := csvReaderFromCommit(baseCommit)
if err == errTooLarge {
return CsvDiffResult{nil, err.Error()}
}
headReader, err := csvReaderFromCommit(headCommit)
if err == errTooLarge {
return CsvDiffResult{nil, err.Error()}
}
sections, err := gitdiff.CreateCsvDiff(diffFile, baseReader, headReader)
if err != nil {
errMessage, err := csv_module.FormatError(err, ctx.Locale)
if err != nil {
log.Error("RenderCsvDiff failed: %v", err)
return CsvDiffResult{nil, ""}
}
return CsvDiffResult{nil, errMessage}
}
return CsvDiffResult{sections, ""}
}
}
// ParseCompareInfo parse compare info between two commit for preparing comparing references
func ParseCompareInfo(ctx *context.Context) (*models.User, *models.Repository, *git.Repository, *git.CompareInfo, string, string) {
baseRepo := ctx.Repo.Repository
// Get compared branches information
// A full compare url is of the form:
//
// 1. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headBranch}
// 2. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headOwner}:{:headBranch}
// 3. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headOwner}/{:headRepoName}:{:headBranch}
//
// Here we obtain the infoPath "{:baseBranch}...[{:headOwner}/{:headRepoName}:]{:headBranch}" as ctx.Params("*")
// with the :baseRepo in ctx.Repo.
//
// Note: Generally :headRepoName is not provided here - we are only passed :headOwner.
//
// How do we determine the :headRepo?
//
// 1. If :headOwner is not set then the :headRepo = :baseRepo
// 2. If :headOwner is set - then look for the fork of :baseRepo owned by :headOwner
// 3. But... :baseRepo could be a fork of :headOwner's repo - so check that
// 4. Now, :baseRepo and :headRepos could be forks of the same repo - so check that
//
// format: <base branch>...[<head repo>:]<head branch>
// base<-head: master...head:feature
// same repo: master...feature
var (
headUser *models.User
headRepo *models.Repository
headBranch string
isSameRepo bool
infoPath string
err error
)
infoPath = ctx.Params("*")
infos := strings.SplitN(infoPath, "...", 2)
if len(infos) != 2 {
log.Trace("ParseCompareInfo[%d]: not enough compared branches information %s", baseRepo.ID, infos)
ctx.NotFound("CompareAndPullRequest", nil)
return nil, nil, nil, nil, "", ""
}
ctx.Data["BaseName"] = baseRepo.OwnerName
baseBranch := infos[0]
ctx.Data["BaseBranch"] = baseBranch
// If there is no head repository, it means compare between same repository.
headInfos := strings.Split(infos[1], ":")
if len(headInfos) == 1 {
isSameRepo = true
headUser = ctx.Repo.Owner
headBranch = headInfos[0]
} else if len(headInfos) == 2 {
headInfosSplit := strings.Split(headInfos[0], "/")
if len(headInfosSplit) == 1 {
headUser, err = models.GetUserByName(headInfos[0])
if err != nil {
if models.IsErrUserNotExist(err) {
ctx.NotFound("GetUserByName", nil)
} else {
ctx.ServerError("GetUserByName", err)
}
return nil, nil, nil, nil, "", ""
}
headBranch = headInfos[1]
isSameRepo = headUser.ID == ctx.Repo.Owner.ID
if isSameRepo {
headRepo = baseRepo
}
} else {
headRepo, err = models.GetRepositoryByOwnerAndName(headInfosSplit[0], headInfosSplit[1])
if err != nil {
if models.IsErrRepoNotExist(err) {
ctx.NotFound("GetRepositoryByOwnerAndName", nil)
} else {
ctx.ServerError("GetRepositoryByOwnerAndName", err)
}
return nil, nil, nil, nil, "", ""
}
if err := headRepo.GetOwner(); err != nil {
if models.IsErrUserNotExist(err) {
ctx.NotFound("GetUserByName", nil)
} else {
ctx.ServerError("GetUserByName", err)
}
return nil, nil, nil, nil, "", ""
}
headBranch = headInfos[1]
headUser = headRepo.Owner
isSameRepo = headRepo.ID == ctx.Repo.Repository.ID
}
} else {
ctx.NotFound("CompareAndPullRequest", nil)
return nil, nil, nil, nil, "", ""
}
ctx.Data["HeadUser"] = headUser
ctx.Data["HeadBranch"] = headBranch
ctx.Repo.PullRequest.SameRepo = isSameRepo
// Check if base branch is valid.
baseIsCommit := ctx.Repo.GitRepo.IsCommitExist(baseBranch)
baseIsBranch := ctx.Repo.GitRepo.IsBranchExist(baseBranch)
baseIsTag := ctx.Repo.GitRepo.IsTagExist(baseBranch)
if !baseIsCommit && !baseIsBranch && !baseIsTag {
// Check if baseBranch is short sha commit hash
if baseCommit, _ := ctx.Repo.GitRepo.GetCommit(baseBranch); baseCommit != nil {
baseBranch = baseCommit.ID.String()
ctx.Data["BaseBranch"] = baseBranch
baseIsCommit = true
} else {
ctx.NotFound("IsRefExist", nil)
return nil, nil, nil, nil, "", ""
}
}
ctx.Data["BaseIsCommit"] = baseIsCommit
ctx.Data["BaseIsBranch"] = baseIsBranch
ctx.Data["BaseIsTag"] = baseIsTag
ctx.Data["IsPull"] = true
// Now we have the repository that represents the base
// The current base and head repositories and branches may not
// actually be the intended branches that the user wants to
// create a pull-request from - but also determining the head
// repo is difficult.
// We will want therefore to offer a few repositories to set as
// our base and head
// 1. First if the baseRepo is a fork get the "RootRepo" it was
// forked from
var rootRepo *models.Repository
if baseRepo.IsFork {
err = baseRepo.GetBaseRepo()
if err != nil {
if !models.IsErrRepoNotExist(err) {
ctx.ServerError("Unable to find root repo", err)
return nil, nil, nil, nil, "", ""
}
} else {
rootRepo = baseRepo.BaseRepo
}
}
// 2. Now if the current user is not the owner of the baseRepo,
// check if they have a fork of the base repo and offer that as
// "OwnForkRepo"
var ownForkRepo *models.Repository
if ctx.User != nil && baseRepo.OwnerID != ctx.User.ID {
repo, has := models.HasForkedRepo(ctx.User.ID, baseRepo.ID)
if has {
ownForkRepo = repo
ctx.Data["OwnForkRepo"] = ownForkRepo
}
}
has := headRepo != nil
// 3. If the base is a forked from "RootRepo" and the owner of
// the "RootRepo" is the :headUser - set headRepo to that
if !has && rootRepo != nil && rootRepo.OwnerID == headUser.ID {
headRepo = rootRepo
has = true
}
// 4. If the ctx.User has their own fork of the baseRepo and the headUser is the ctx.User
// set the headRepo to the ownFork
if !has && ownForkRepo != nil && ownForkRepo.OwnerID == headUser.ID {
headRepo = ownForkRepo
has = true
}
// 5. If the headOwner has a fork of the baseRepo - use that
if !has {
headRepo, has = models.HasForkedRepo(headUser.ID, baseRepo.ID)
}
// 6. If the baseRepo is a fork and the headUser has a fork of that use that
if !has && baseRepo.IsFork {
headRepo, has = models.HasForkedRepo(headUser.ID, baseRepo.ForkID)
}
// 7. Otherwise if we're not the same repo and haven't found a repo give up
if !isSameRepo && !has {
ctx.Data["PageIsComparePull"] = false
}
// 8. Finally open the git repo
var headGitRepo *git.Repository
if isSameRepo {
headRepo = ctx.Repo.Repository
headGitRepo = ctx.Repo.GitRepo
} else if has {
headGitRepo, err = git.OpenRepository(headRepo.RepoPath())
if err != nil {
ctx.ServerError("OpenRepository", err)
return nil, nil, nil, nil, "", ""
}
defer headGitRepo.Close()
}
ctx.Data["HeadRepo"] = headRepo
// Now we need to assert that the ctx.User has permission to read
// the baseRepo's code and pulls
// (NOT headRepo's)
permBase, err := models.GetUserRepoPermission(baseRepo, ctx.User)
if err != nil {
ctx.ServerError("GetUserRepoPermission", err)
return nil, nil, nil, nil, "", ""
}
if !permBase.CanRead(models.UnitTypeCode) {
if log.IsTrace() {
log.Trace("Permission Denied: User: %-v cannot read code in Repo: %-v\nUser in baseRepo has Permissions: %-+v",
ctx.User,
baseRepo,
permBase)
}
ctx.NotFound("ParseCompareInfo", nil)
return nil, nil, nil, nil, "", ""
}
// If we're not merging from the same repo:
if !isSameRepo {
// Assert ctx.User has permission to read headRepo's codes
permHead, err := models.GetUserRepoPermission(headRepo, ctx.User)
if err != nil {
ctx.ServerError("GetUserRepoPermission", err)
return nil, nil, nil, nil, "", ""
}
if !permHead.CanRead(models.UnitTypeCode) {
if log.IsTrace() {
log.Trace("Permission Denied: User: %-v cannot read code in Repo: %-v\nUser in headRepo has Permissions: %-+v",
ctx.User,
headRepo,
permHead)
}
ctx.NotFound("ParseCompareInfo", nil)
return nil, nil, nil, nil, "", ""
}
}
// If we have a rootRepo and it's different from:
// 1. the computed base
// 2. the computed head
// then get the branches of it
if rootRepo != nil &&
rootRepo.ID != headRepo.ID &&
rootRepo.ID != baseRepo.ID {
perm, branches, tags, err := getBranchesAndTagsForRepo(ctx.User, rootRepo)
if err != nil {
ctx.ServerError("GetBranchesForRepo", err)
return nil, nil, nil, nil, "", ""
}
if perm {
ctx.Data["RootRepo"] = rootRepo
ctx.Data["RootRepoBranches"] = branches
ctx.Data["RootRepoTags"] = tags
}
}
// If we have a ownForkRepo and it's different from:
// 1. The computed base
// 2. The computed head
// 3. The rootRepo (if we have one)
// then get the branches from it.
if ownForkRepo != nil &&
ownForkRepo.ID != headRepo.ID &&
ownForkRepo.ID != baseRepo.ID &&
(rootRepo == nil || ownForkRepo.ID != rootRepo.ID) {
perm, branches, tags, err := getBranchesAndTagsForRepo(ctx.User, ownForkRepo)
if err != nil {
ctx.ServerError("GetBranchesForRepo", err)
return nil, nil, nil, nil, "", ""
}
if perm {
ctx.Data["OwnForkRepo"] = ownForkRepo
ctx.Data["OwnForkRepoBranches"] = branches
ctx.Data["OwnForkRepoTags"] = tags
}
}
// Check if head branch is valid.
headIsCommit := headGitRepo.IsCommitExist(headBranch)
headIsBranch := headGitRepo.IsBranchExist(headBranch)
headIsTag := headGitRepo.IsTagExist(headBranch)
if !headIsCommit && !headIsBranch && !headIsTag {
// Check if headBranch is short sha commit hash
if headCommit, _ := headGitRepo.GetCommit(headBranch); headCommit != nil {
headBranch = headCommit.ID.String()
ctx.Data["HeadBranch"] = headBranch
headIsCommit = true
} else {
ctx.NotFound("IsRefExist", nil)
return nil, nil, nil, nil, "", ""
}
}
ctx.Data["HeadIsCommit"] = headIsCommit
ctx.Data["HeadIsBranch"] = headIsBranch
ctx.Data["HeadIsTag"] = headIsTag
// Treat as pull request if both references are branches
if ctx.Data["PageIsComparePull"] == nil {
ctx.Data["PageIsComparePull"] = headIsBranch && baseIsBranch
}
if ctx.Data["PageIsComparePull"] == true && !permBase.CanReadIssuesOrPulls(true) {
if log.IsTrace() {
log.Trace("Permission Denied: User: %-v cannot create/read pull requests in Repo: %-v\nUser in baseRepo has Permissions: %-+v",
ctx.User,
baseRepo,
permBase)
}
ctx.NotFound("ParseCompareInfo", nil)
return nil, nil, nil, nil, "", ""
}
baseBranchRef := baseBranch
if baseIsBranch {
baseBranchRef = git.BranchPrefix + baseBranch
} else if baseIsTag {
baseBranchRef = git.TagPrefix + baseBranch
}
headBranchRef := headBranch
if headIsBranch {
headBranchRef = git.BranchPrefix + headBranch
} else if headIsTag {
headBranchRef = git.TagPrefix + headBranch
}
compareInfo, err := headGitRepo.GetCompareInfo(baseRepo.RepoPath(), baseBranchRef, headBranchRef)
if err != nil {
ctx.ServerError("GetCompareInfo", err)
return nil, nil, nil, nil, "", ""
}
ctx.Data["BeforeCommitID"] = compareInfo.MergeBase
return headUser, headRepo, headGitRepo, compareInfo, baseBranch, headBranch
}
// PrepareCompareDiff renders compare diff page
func PrepareCompareDiff(
ctx *context.Context,
headUser *models.User,
headRepo *models.Repository,
headGitRepo *git.Repository,
compareInfo *git.CompareInfo,
baseBranch, headBranch string,
whitespaceBehavior string) bool {
var (
repo = ctx.Repo.Repository
err error
title string
)
// Get diff information.
ctx.Data["CommitRepoLink"] = headRepo.Link()
headCommitID := compareInfo.HeadCommitID
ctx.Data["AfterCommitID"] = headCommitID
if headCommitID == compareInfo.MergeBase {
ctx.Data["IsNothingToCompare"] = true
if unit, err := repo.GetUnit(models.UnitTypePullRequests); err == nil {
config := unit.PullRequestsConfig()
if !config.AutodetectManualMerge {
allowEmptyPr := !(baseBranch == headBranch && ctx.Repo.Repository.Name == headRepo.Name)
ctx.Data["AllowEmptyPr"] = allowEmptyPr
return !allowEmptyPr
}
ctx.Data["AllowEmptyPr"] = false
}
return true
}
diff, err := gitdiff.GetDiffRangeWithWhitespaceBehavior(models.RepoPath(headUser.Name, headRepo.Name),
compareInfo.MergeBase, headCommitID, setting.Git.MaxGitDiffLines,
setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, whitespaceBehavior)
if err != nil {
ctx.ServerError("GetDiffRangeWithWhitespaceBehavior", err)
return false
}
ctx.Data["Diff"] = diff
ctx.Data["DiffNotAvailable"] = diff.NumFiles == 0
headCommit, err := headGitRepo.GetCommit(headCommitID)
if err != nil {
ctx.ServerError("GetCommit", err)
return false
}
baseGitRepo := ctx.Repo.GitRepo
baseCommitID := compareInfo.BaseCommitID
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, headRepo)
compareInfo.Commits = models.ParseCommitsWithStatus(compareInfo.Commits, headRepo)
ctx.Data["Commits"] = compareInfo.Commits
ctx.Data["CommitCount"] = compareInfo.Commits.Len()
if compareInfo.Commits.Len() == 1 {
c := compareInfo.Commits.Front().Value.(models.SignCommitWithStatuses)
title = strings.TrimSpace(c.UserCommit.Summary())
body := strings.Split(strings.TrimSpace(c.UserCommit.Message()), "\n")
if len(body) > 1 {
ctx.Data["content"] = strings.Join(body[1:], "\n")
}
} else {
title = headBranch
}
if len(title) > 255 {
var trailer string
title, trailer = util.SplitStringAtByteN(title, 255)
if len(trailer) > 0 {
if ctx.Data["content"] != nil {
ctx.Data["content"] = fmt.Sprintf("%s\n\n%s", trailer, ctx.Data["content"])
} else {
ctx.Data["content"] = trailer + "\n"
}
}
}
ctx.Data["title"] = title
ctx.Data["Username"] = headUser.Name
ctx.Data["Reponame"] = headRepo.Name
headTarget := path.Join(headUser.Name, repo.Name)
setCompareContext(ctx, baseCommit, headCommit, headTarget)
return false
}
func getBranchesAndTagsForRepo(user *models.User, repo *models.Repository) (bool, []string, []string, error) {
perm, err := models.GetUserRepoPermission(repo, user)
if err != nil {
return false, nil, nil, err
}
if !perm.CanRead(models.UnitTypeCode) {
return false, nil, nil, nil
}
gitRepo, err := git.OpenRepository(repo.RepoPath())
if err != nil {
return false, nil, nil, err
}
defer gitRepo.Close()
branches, _, err := gitRepo.GetBranches(0, 0)
if err != nil {
return false, nil, nil, err
}
tags, err := gitRepo.GetTags()
if err != nil {
return false, nil, nil, err
}
return true, branches, tags, nil
}
// CompareDiff show different from one commit to another commit
func CompareDiff(ctx *context.Context) {
headUser, headRepo, headGitRepo, compareInfo, baseBranch, headBranch := ParseCompareInfo(ctx)
if ctx.Written() {
return
}
defer headGitRepo.Close()
nothingToCompare := PrepareCompareDiff(ctx, headUser, headRepo, headGitRepo, compareInfo, baseBranch, headBranch,
gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)))
if ctx.Written() {
return
}
baseGitRepo := ctx.Repo.GitRepo
baseTags, err := baseGitRepo.GetTags()
if err != nil {
ctx.ServerError("GetTags", err)
return
}
ctx.Data["Tags"] = baseTags
headBranches, _, err := headGitRepo.GetBranches(0, 0)
if err != nil {
ctx.ServerError("GetBranches", err)
return
}
ctx.Data["HeadBranches"] = headBranches
headTags, err := headGitRepo.GetTags()
if err != nil {
ctx.ServerError("GetTags", err)
return
}
ctx.Data["HeadTags"] = headTags
if ctx.Data["PageIsComparePull"] == true {
pr, err := models.GetUnmergedPullRequest(headRepo.ID, ctx.Repo.Repository.ID, headBranch, baseBranch)
if err != nil {
if !models.IsErrPullRequestNotExist(err) {
ctx.ServerError("GetUnmergedPullRequest", err)
return
}
} else {
ctx.Data["HasPullRequest"] = true
ctx.Data["PullRequest"] = pr
ctx.HTML(http.StatusOK, tplCompareDiff)
return
}
if !nothingToCompare {
// Setup information for new form.
RetrieveRepoMetas(ctx, ctx.Repo.Repository, true)
if ctx.Written() {
return
}
}
}
beforeCommitID := ctx.Data["BeforeCommitID"].(string)
afterCommitID := ctx.Data["AfterCommitID"].(string)
ctx.Data["Title"] = "Comparing " + base.ShortSha(beforeCommitID) + "..." + base.ShortSha(afterCommitID)
ctx.Data["IsRepoToolbarCommits"] = true
ctx.Data["IsDiffCompare"] = true
ctx.Data["RequireTribute"] = true
ctx.Data["RequireSimpleMDE"] = true
ctx.Data["PullRequestWorkInProgressPrefixes"] = setting.Repository.PullRequest.WorkInProgressPrefixes
setTemplateIfExists(ctx, pullRequestTemplateKey, nil, pullRequestTemplateCandidates)
ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
upload.AddUploadContext(ctx, "comment")
ctx.Data["HasIssuesOrPullsWritePermission"] = ctx.Repo.CanWrite(models.UnitTypePullRequests)
ctx.HTML(http.StatusOK, tplCompare)
}
// ExcerptBlob render blob excerpt contents
func ExcerptBlob(ctx *context.Context) {
commitID := ctx.Params("sha")
lastLeft := ctx.QueryInt("last_left")
lastRight := ctx.QueryInt("last_right")
idxLeft := ctx.QueryInt("left")
idxRight := ctx.QueryInt("right")
leftHunkSize := ctx.QueryInt("left_hunk_size")
rightHunkSize := ctx.QueryInt("right_hunk_size")
anchor := ctx.Query("anchor")
direction := ctx.Query("direction")
filePath := ctx.Query("path")
gitRepo := ctx.Repo.GitRepo
chunkSize := gitdiff.BlobExcerptChunkSize
commit, err := gitRepo.GetCommit(commitID)
if err != nil {
ctx.Error(http.StatusInternalServerError, "GetCommit")
return
}
section := &gitdiff.DiffSection{
FileName: filePath,
Name: filePath,
}
if direction == "up" && (idxLeft-lastLeft) > chunkSize {
idxLeft -= chunkSize
idxRight -= chunkSize
leftHunkSize += chunkSize
rightHunkSize += chunkSize
section.Lines, err = getExcerptLines(commit, filePath, idxLeft-1, idxRight-1, chunkSize)
} else if direction == "down" && (idxLeft-lastLeft) > chunkSize {
section.Lines, err = getExcerptLines(commit, filePath, lastLeft, lastRight, chunkSize)
lastLeft += chunkSize
lastRight += chunkSize
} else {
offset := -1
if direction == "down" {
offset = 0
}
section.Lines, err = getExcerptLines(commit, filePath, lastLeft, lastRight, idxRight-lastRight+offset)
leftHunkSize = 0
rightHunkSize = 0
idxLeft = lastLeft
idxRight = lastRight
}
if err != nil {
ctx.Error(http.StatusInternalServerError, "getExcerptLines")
return
}
if idxRight > lastRight {
lineText := " "
if rightHunkSize > 0 || leftHunkSize > 0 {
lineText = fmt.Sprintf("@@ -%d,%d +%d,%d @@\n", idxLeft, leftHunkSize, idxRight, rightHunkSize)
}
lineText = html.EscapeString(lineText)
lineSection := &gitdiff.DiffLine{
Type: gitdiff.DiffLineSection,
Content: lineText,
SectionInfo: &gitdiff.DiffLineSectionInfo{
Path: filePath,
LastLeftIdx: lastLeft,
LastRightIdx: lastRight,
LeftIdx: idxLeft,
RightIdx: idxRight,
LeftHunkSize: leftHunkSize,
RightHunkSize: rightHunkSize,
}}
if direction == "up" {
section.Lines = append([]*gitdiff.DiffLine{lineSection}, section.Lines...)
} else if direction == "down" {
section.Lines = append(section.Lines, lineSection)
}
}
ctx.Data["section"] = section
ctx.Data["fileName"] = filePath
ctx.Data["AfterCommitID"] = commitID
ctx.Data["Anchor"] = anchor
ctx.HTML(http.StatusOK, tplBlobExcerpt)
}
func getExcerptLines(commit *git.Commit, filePath string, idxLeft int, idxRight int, chunkSize int) ([]*gitdiff.DiffLine, error) {
blob, err := commit.Tree.GetBlobByPath(filePath)
if err != nil {
return nil, err
}
reader, err := blob.DataAsync()
if err != nil {
return nil, err
}
defer reader.Close()
scanner := bufio.NewScanner(reader)
var diffLines []*gitdiff.DiffLine
for line := 0; line < idxRight+chunkSize; line++ {
if ok := scanner.Scan(); !ok {
break
}
if line < idxRight {
continue
}
lineText := scanner.Text()
diffLine := &gitdiff.DiffLine{
LeftIdx: idxLeft + (line - idxRight) + 1,
RightIdx: line + 1,
Type: gitdiff.DiffLinePlain,
Content: " " + lineText,
}
diffLines = append(diffLines, diffLine)
}
return diffLines, nil
}