261 lines
7.9 KiB
Go
261 lines
7.9 KiB
Go
// 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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