mirror of https://github.com/go-gitea/gitea
Some refactor on git diff and ignore getting commit information failed on migrating pull request review comments (#9996)
* Some refactor on git diff and ignore getting commit information failed on migrating pull request review comments * fix test * fix lint * Change error log to warnpull/9997/head^2
Lunny Xiao
5 years ago
committed by
zeripath
parent
1019913eab
commit
e8860ef4f9
@ -0,0 +1,260 @@ |
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// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package git |
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import ( |
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"bufio" |
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"bytes" |
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"context" |
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"fmt" |
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"io" |
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"os/exec" |
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"regexp" |
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"strconv" |
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"strings" |
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"code.gitea.io/gitea/modules/process" |
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) |
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// RawDiffType type of a raw diff.
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type RawDiffType string |
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// RawDiffType possible values.
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const ( |
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RawDiffNormal RawDiffType = "diff" |
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RawDiffPatch RawDiffType = "patch" |
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) |
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// GetRawDiff dumps diff results of repository in given commit ID to io.Writer.
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func GetRawDiff(repoPath, commitID string, diffType RawDiffType, writer io.Writer) error { |
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return GetRawDiffForFile(repoPath, "", commitID, diffType, "", writer) |
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} |
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// GetRawDiffForFile dumps diff results of file in given commit ID to io.Writer.
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func GetRawDiffForFile(repoPath, startCommit, endCommit string, diffType RawDiffType, file string, writer io.Writer) error { |
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repo, err := OpenRepository(repoPath) |
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if err != nil { |
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return fmt.Errorf("OpenRepository: %v", err) |
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} |
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defer repo.Close() |
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return GetRepoRawDiffForFile(repo, startCommit, endCommit, diffType, file, writer) |
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} |
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// GetRepoRawDiffForFile dumps diff results of file in given commit ID to io.Writer according given repository
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func GetRepoRawDiffForFile(repo *Repository, startCommit, endCommit string, diffType RawDiffType, file string, writer io.Writer) error { |
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commit, err := repo.GetCommit(endCommit) |
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if err != nil { |
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return fmt.Errorf("GetCommit: %v", err) |
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} |
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fileArgs := make([]string, 0) |
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if len(file) > 0 { |
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fileArgs = append(fileArgs, "--", file) |
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} |
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// FIXME: graceful: These commands should have a timeout
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ctx, cancel := context.WithCancel(DefaultContext) |
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defer cancel() |
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var cmd *exec.Cmd |
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switch diffType { |
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case RawDiffNormal: |
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if len(startCommit) != 0 { |
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cmd = exec.CommandContext(ctx, GitExecutable, append([]string{"diff", "-M", startCommit, endCommit}, fileArgs...)...) |
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} else if commit.ParentCount() == 0 { |
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cmd = exec.CommandContext(ctx, GitExecutable, append([]string{"show", endCommit}, fileArgs...)...) |
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} else { |
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c, _ := commit.Parent(0) |
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cmd = exec.CommandContext(ctx, GitExecutable, append([]string{"diff", "-M", c.ID.String(), endCommit}, fileArgs...)...) |
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} |
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case RawDiffPatch: |
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if len(startCommit) != 0 { |
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query := fmt.Sprintf("%s...%s", endCommit, startCommit) |
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cmd = exec.CommandContext(ctx, GitExecutable, append([]string{"format-patch", "--no-signature", "--stdout", "--root", query}, fileArgs...)...) |
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} else if commit.ParentCount() == 0 { |
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cmd = exec.CommandContext(ctx, GitExecutable, append([]string{"format-patch", "--no-signature", "--stdout", "--root", endCommit}, fileArgs...)...) |
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} else { |
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c, _ := commit.Parent(0) |
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query := fmt.Sprintf("%s...%s", endCommit, c.ID.String()) |
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cmd = exec.CommandContext(ctx, GitExecutable, append([]string{"format-patch", "--no-signature", "--stdout", query}, fileArgs...)...) |
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} |
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default: |
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return fmt.Errorf("invalid diffType: %s", diffType) |
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} |
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stderr := new(bytes.Buffer) |
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cmd.Dir = repo.Path |
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cmd.Stdout = writer |
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cmd.Stderr = stderr |
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pid := process.GetManager().Add(fmt.Sprintf("GetRawDiffForFile: [repo_path: %s]", repo.Path), cancel) |
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defer process.GetManager().Remove(pid) |
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if err = cmd.Run(); err != nil { |
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return fmt.Errorf("Run: %v - %s", err, stderr) |
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} |
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return nil |
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} |
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// ParseDiffHunkString parse the diffhunk content and return
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func ParseDiffHunkString(diffhunk string) (leftLine, leftHunk, rightLine, righHunk int) { |
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ss := strings.Split(diffhunk, "@@") |
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ranges := strings.Split(ss[1][1:], " ") |
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leftRange := strings.Split(ranges[0], ",") |
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leftLine, _ = strconv.Atoi(leftRange[0][1:]) |
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if len(leftRange) > 1 { |
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leftHunk, _ = strconv.Atoi(leftRange[1]) |
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} |
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if len(ranges) > 1 { |
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rightRange := strings.Split(ranges[1], ",") |
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rightLine, _ = strconv.Atoi(rightRange[0]) |
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if len(rightRange) > 1 { |
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righHunk, _ = strconv.Atoi(rightRange[1]) |
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} |
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} else { |
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log("Parse line number failed: %v", diffhunk) |
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rightLine = leftLine |
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righHunk = leftHunk |
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} |
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return |
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} |
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// Example: @@ -1,8 +1,9 @@ => [..., 1, 8, 1, 9]
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var hunkRegex = regexp.MustCompile(`^@@ -(?P<beginOld>[0-9]+)(,(?P<endOld>[0-9]+))? \+(?P<beginNew>[0-9]+)(,(?P<endNew>[0-9]+))? @@`) |
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const cmdDiffHead = "diff --git " |
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func isHeader(lof string) bool { |
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return strings.HasPrefix(lof, cmdDiffHead) || strings.HasPrefix(lof, "---") || strings.HasPrefix(lof, "+++") |
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} |
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// CutDiffAroundLine cuts a diff of a file in way that only the given line + numberOfLine above it will be shown
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// it also recalculates hunks and adds the appropriate headers to the new diff.
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// Warning: Only one-file diffs are allowed.
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func CutDiffAroundLine(originalDiff io.Reader, line int64, old bool, numbersOfLine int) string { |
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if line == 0 || numbersOfLine == 0 { |
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// no line or num of lines => no diff
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return "" |
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} |
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scanner := bufio.NewScanner(originalDiff) |
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hunk := make([]string, 0) |
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// begin is the start of the hunk containing searched line
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// end is the end of the hunk ...
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// currentLine is the line number on the side of the searched line (differentiated by old)
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// otherLine is the line number on the opposite side of the searched line (differentiated by old)
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var begin, end, currentLine, otherLine int64 |
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var headerLines int |
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for scanner.Scan() { |
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lof := scanner.Text() |
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// Add header to enable parsing
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if isHeader(lof) { |
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hunk = append(hunk, lof) |
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headerLines++ |
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} |
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if currentLine > line { |
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break |
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} |
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// Detect "hunk" with contains commented lof
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if strings.HasPrefix(lof, "@@") { |
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// Already got our hunk. End of hunk detected!
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if len(hunk) > headerLines { |
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break |
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} |
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// A map with named groups of our regex to recognize them later more easily
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submatches := hunkRegex.FindStringSubmatch(lof) |
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groups := make(map[string]string) |
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for i, name := range hunkRegex.SubexpNames() { |
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if i != 0 && name != "" { |
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groups[name] = submatches[i] |
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} |
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} |
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if old { |
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begin, _ = strconv.ParseInt(groups["beginOld"], 10, 64) |
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end, _ = strconv.ParseInt(groups["endOld"], 10, 64) |
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// init otherLine with begin of opposite side
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otherLine, _ = strconv.ParseInt(groups["beginNew"], 10, 64) |
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} else { |
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begin, _ = strconv.ParseInt(groups["beginNew"], 10, 64) |
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if groups["endNew"] != "" { |
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end, _ = strconv.ParseInt(groups["endNew"], 10, 64) |
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} else { |
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end = 0 |
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} |
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// init otherLine with begin of opposite side
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otherLine, _ = strconv.ParseInt(groups["beginOld"], 10, 64) |
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} |
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end += begin // end is for real only the number of lines in hunk
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// lof is between begin and end
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if begin <= line && end >= line { |
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hunk = append(hunk, lof) |
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currentLine = begin |
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continue |
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} |
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} else if len(hunk) > headerLines { |
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hunk = append(hunk, lof) |
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// Count lines in context
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switch lof[0] { |
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case '+': |
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if !old { |
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currentLine++ |
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} else { |
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otherLine++ |
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} |
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case '-': |
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if old { |
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currentLine++ |
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} else { |
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otherLine++ |
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} |
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default: |
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currentLine++ |
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otherLine++ |
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} |
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} |
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} |
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// No hunk found
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if currentLine == 0 { |
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return "" |
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} |
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// headerLines + hunkLine (1) = totalNonCodeLines
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if len(hunk)-headerLines-1 <= numbersOfLine { |
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// No need to cut the hunk => return existing hunk
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return strings.Join(hunk, "\n") |
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} |
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var oldBegin, oldNumOfLines, newBegin, newNumOfLines int64 |
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if old { |
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oldBegin = currentLine |
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newBegin = otherLine |
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} else { |
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oldBegin = otherLine |
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newBegin = currentLine |
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} |
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// headers + hunk header
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newHunk := make([]string, headerLines) |
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// transfer existing headers
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copy(newHunk, hunk[:headerLines]) |
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// transfer last n lines
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newHunk = append(newHunk, hunk[len(hunk)-numbersOfLine-1:]...) |
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// calculate newBegin, ... by counting lines
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for i := len(hunk) - 1; i >= len(hunk)-numbersOfLine; i-- { |
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switch hunk[i][0] { |
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case '+': |
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newBegin-- |
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newNumOfLines++ |
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case '-': |
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oldBegin-- |
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oldNumOfLines++ |
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default: |
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oldBegin-- |
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newBegin-- |
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newNumOfLines++ |
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oldNumOfLines++ |
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} |
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} |
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// construct the new hunk header
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newHunk[headerLines] = fmt.Sprintf("@@ -%d,%d +%d,%d @@", |
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oldBegin, oldNumOfLines, newBegin, newNumOfLines) |
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return strings.Join(newHunk, "\n") |
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} |
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@ -0,0 +1,82 @@ |
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// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package git |
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import ( |
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"strings" |
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"testing" |
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"github.com/stretchr/testify/assert" |
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) |
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const exampleDiff = `diff --git a/README.md b/README.md |
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--- a/README.md |
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+++ b/README.md |
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@@ -1,3 +1,6 @@ |
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# gitea-github-migrator |
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+ |
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+ Build Status |
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- Latest Release |
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Docker Pulls |
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+ cut off |
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+ cut off` |
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func TestCutDiffAroundLine(t *testing.T) { |
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result := CutDiffAroundLine(strings.NewReader(exampleDiff), 4, false, 3) |
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resultByLine := strings.Split(result, "\n") |
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assert.Len(t, resultByLine, 7) |
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// Check if headers got transferred
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assert.Equal(t, "diff --git a/README.md b/README.md", resultByLine[0]) |
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assert.Equal(t, "--- a/README.md", resultByLine[1]) |
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assert.Equal(t, "+++ b/README.md", resultByLine[2]) |
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// Check if hunk header is calculated correctly
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assert.Equal(t, "@@ -2,2 +3,2 @@", resultByLine[3]) |
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// Check if line got transferred
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assert.Equal(t, "+ Build Status", resultByLine[4]) |
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// Must be same result as before since old line 3 == new line 5
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newResult := CutDiffAroundLine(strings.NewReader(exampleDiff), 3, true, 3) |
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assert.Equal(t, result, newResult, "Must be same result as before since old line 3 == new line 5") |
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newResult = CutDiffAroundLine(strings.NewReader(exampleDiff), 6, false, 300) |
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assert.Equal(t, exampleDiff, newResult) |
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emptyResult := CutDiffAroundLine(strings.NewReader(exampleDiff), 6, false, 0) |
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assert.Empty(t, emptyResult) |
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// Line is out of scope
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emptyResult = CutDiffAroundLine(strings.NewReader(exampleDiff), 434, false, 0) |
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assert.Empty(t, emptyResult) |
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} |
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func BenchmarkCutDiffAroundLine(b *testing.B) { |
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for n := 0; n < b.N; n++ { |
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CutDiffAroundLine(strings.NewReader(exampleDiff), 3, true, 3) |
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} |
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} |
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func ExampleCutDiffAroundLine() { |
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const diff = `diff --git a/README.md b/README.md |
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--- a/README.md |
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+++ b/README.md |
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@@ -1,3 +1,6 @@ |
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# gitea-github-migrator |
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+ |
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+ Build Status |
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- Latest Release |
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Docker Pulls |
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+ cut off |
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+ cut off` |
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result := CutDiffAroundLine(strings.NewReader(diff), 4, false, 3) |
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println(result) |
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} |
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func TestParseDiffHunkString(t *testing.T) { |
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leftLine, leftHunk, rightLine, rightHunk := ParseDiffHunkString("@@ -19,3 +19,5 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER") |
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assert.EqualValues(t, 19, leftLine) |
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assert.EqualValues(t, 3, leftHunk) |
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assert.EqualValues(t, 19, rightLine) |
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assert.EqualValues(t, 5, rightHunk) |
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} |
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