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package helpers
import (
"regexp"
"strings"
"sync"
"github.com/jesseduffield/generics/set"
"github.com/jesseduffield/lazygit/pkg/commands/models"
"github.com/jesseduffield/lazygit/pkg/gui/types"
"github.com/jesseduffield/lazygit/pkg/utils"
"github.com/samber/lo"
)
type FixupHelper struct {
c *HelperCommon
}
func NewFixupHelper(
c *HelperCommon,
) *FixupHelper {
return &FixupHelper{
c: c,
}
}
type deletedLineInfo struct {
filename string
startLineIdx int
numLines int
}
func (self *FixupHelper) HandleFindBaseCommitForFixupPress() error {
diff, hasStagedChanges, err := self.getDiff()
if err != nil {
return err
}
if diff == "" {
return self.c.ErrorMsg(self.c.Tr.NoChangedFiles)
}
deletedLineInfos, hasHunksWithOnlyAddedLines := self.parseDiff(diff)
if len(deletedLineInfos) == 0 {
return self.c.ErrorMsg(self.c.Tr.NoDeletedLinesInDiff)
}
hashes := self.blameDeletedLines(deletedLineInfos)
if len(hashes) == 0 {
// This should never happen
return self.c.ErrorMsg(self.c.Tr.NoBaseCommitsFound)
}
if len(hashes) > 1 {
subjects, err := self.c.Git().Commit.GetHashesAndCommitMessagesFirstLine(hashes)
if err != nil {
return err
}
message := lo.Ternary(hasStagedChanges,
self.c.Tr.MultipleBaseCommitsFoundStaged,
self.c.Tr.MultipleBaseCommitsFoundUnstaged)
return self.c.ErrorMsg(message + "\n\n" + subjects)
}
commit, index, ok := lo.FindIndexOf(self.c.Model().Commits, func(commit *models.Commit) bool {
return commit.Hash == hashes[0]
})
if !ok {
commits := self.c.Model().Commits
if commits[len(commits)-1].Status == models.StatusMerged {
// If the commit is not found, it's most likely because it's already
// merged, and more than 300 commits away. Check if the last known
// commit is already merged; if so, show the "already merged" error.
return self.c.ErrorMsg(self.c.Tr.BaseCommitIsAlreadyOnMainBranch)
}
// If we get here, the current branch must have more then 300 commits. Unlikely...
return self.c.ErrorMsg(self.c.Tr.BaseCommitIsNotInCurrentView)
}
if commit.Status == models.StatusMerged {
return self.c.ErrorMsg(self.c.Tr.BaseCommitIsAlreadyOnMainBranch)
}
doIt := func() error {
if !hasStagedChanges {
if err := self.c.Git().WorkingTree.StageAll(); err != nil {
return err
}
_ = self.c.Refresh(types.RefreshOptions{Mode: types.SYNC, Scope: []types.RefreshableView{types.FILES}})
}
self.c.Contexts().LocalCommits.SetSelection(index)
return self.c.PushContext(self.c.Contexts().LocalCommits)
}
if hasHunksWithOnlyAddedLines {
return self.c.Confirm(types.ConfirmOpts{
Title: self.c.Tr.FindBaseCommitForFixup,
Prompt: self.c.Tr.HunksWithOnlyAddedLinesWarning,
HandleConfirm: func() error {
return doIt()
},
})
}
return doIt()
}
func (self *FixupHelper) getDiff() (string, bool, error) {
args := []string{"-U0", "--ignore-submodules=all", "HEAD", "--"}
// Try staged changes first
hasStagedChanges := true
diff, err := self.c.Git().Diff.DiffIndexCmdObj(append([]string{"--cached"}, args...)...).RunWithOutput()
if err == nil && diff == "" {
hasStagedChanges = false
// If there are no staged changes, try unstaged changes
diff, err = self.c.Git().Diff.DiffIndexCmdObj(args...).RunWithOutput()
}
return diff, hasStagedChanges, err
}
func (self *FixupHelper) parseDiff(diff string) ([]*deletedLineInfo, bool) {
lines := strings.Split(strings.TrimSuffix(diff, "\n"), "\n")
deletedLineInfos := []*deletedLineInfo{}
hasHunksWithOnlyAddedLines := false
hunkHeaderRegexp := regexp.MustCompile(`@@ -(\d+)(?:,\d+)? \+\d+(?:,\d+)? @@`)
var filename string
var currentLineInfo *deletedLineInfo
finishHunk := func() {
if currentLineInfo != nil {
if currentLineInfo.numLines > 0 {
deletedLineInfos = append(deletedLineInfos, currentLineInfo)
} else {
hasHunksWithOnlyAddedLines = true
}
}
}
for _, line := range lines {
if strings.HasPrefix(line, "diff --git") {
finishHunk()
currentLineInfo = nil
} else if strings.HasPrefix(line, "--- ") {
// For some reason, the line ends with a tab character if the file
// name contains spaces
filename = strings.TrimRight(line[6:], "\t")
} else if strings.HasPrefix(line, "@@ ") {
finishHunk()
match := hunkHeaderRegexp.FindStringSubmatch(line)
startIdx := utils.MustConvertToInt(match[1])
currentLineInfo = &deletedLineInfo{filename, startIdx, 0}
} else if currentLineInfo != nil && line[0] == '-' {
currentLineInfo.numLines++
}
}
finishHunk()
return deletedLineInfos, hasHunksWithOnlyAddedLines
}
// returns the list of commit hashes that introduced the lines which have now been deleted
func (self *FixupHelper) blameDeletedLines(deletedLineInfos []*deletedLineInfo) []string {
var wg sync.WaitGroup
hashChan := make(chan string)
for _, info := range deletedLineInfos {
wg.Add(1)
go func(info *deletedLineInfo) {
defer wg.Done()
blameOutput, err := self.c.Git().Blame.BlameLineRange(info.filename, "HEAD", info.startLineIdx, info.numLines)
if err != nil {
self.c.Log.Errorf("Error blaming file '%s': %v", info.filename, err)
return
}
blameLines := strings.Split(strings.TrimSuffix(blameOutput, "\n"), "\n")
for _, line := range blameLines {
hashChan <- strings.Split(line, " ")[0]
}
}(info)
}
go func() {
wg.Wait()
close(hashChan)
}()
result := set.New[string]()
for hash := range hashChan {
result.Add(hash)
}
return result.ToSlice()
}
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