mirror of
https://github.com/harness/drone.git
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104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
// Copyright 2022 Harness Inc. All rights reserved.
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// Use of this source code is governed by the Polyform Free Trial License
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// that can be found in the LICENSE.md file for this repository.
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package parser
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import (
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"bufio"
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"io"
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"regexp"
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"github.com/harness/gitness/gitrpc/enum"
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"github.com/harness/gitness/gitrpc/internal/types"
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)
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var regExpDiffFileHeader = regexp.MustCompile(`^diff --git a/(.+) b/(.+)$`)
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func ParseDiffFileHeader(line string) (types.DiffFileHeader, bool) {
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groups := regExpDiffFileHeader.FindStringSubmatch(line)
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if groups == nil {
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return types.DiffFileHeader{}, false
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}
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return types.DiffFileHeader{
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OldFileName: groups[1],
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NewFileName: groups[2],
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Extensions: map[string]string{},
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}, true
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}
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var regExpDiffExtHeader = regexp.MustCompile(
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"^(" +
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enum.DiffExtHeaderOldMode + "|" +
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enum.DiffExtHeaderNewMode + "|" +
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enum.DiffExtHeaderDeletedFileMode + "|" +
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enum.DiffExtHeaderNewFileMode + "|" +
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enum.DiffExtHeaderCopyFrom + "|" +
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enum.DiffExtHeaderCopyTo + "|" +
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enum.DiffExtHeaderRenameFrom + "|" +
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enum.DiffExtHeaderRenameTo + "|" +
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enum.DiffExtHeaderSimilarity + "|" +
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enum.DiffExtHeaderDissimilarity + "|" +
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enum.DiffExtHeaderIndex +
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") (.+)$")
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func ParseDiffFileExtendedHeader(line string) (string, string) {
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groups := regExpDiffExtHeader.FindStringSubmatch(line)
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if groups == nil {
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return "", ""
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}
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return groups[1], groups[2]
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}
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// GetHunkHeaders parses git diff output and returns all diff headers for all files.
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// See for documentation: https://git-scm.com/docs/git-diff#generate_patch_text_with_p
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func GetHunkHeaders(r io.Reader) ([]*types.DiffFileHunkHeaders, error) {
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scanner := bufio.NewScanner(r)
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var currentFile *types.DiffFileHunkHeaders
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var result []*types.DiffFileHunkHeaders
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for scanner.Scan() {
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line := scanner.Text()
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if h, ok := ParseDiffFileHeader(line); ok {
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if currentFile != nil {
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result = append(result, currentFile)
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}
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currentFile = &types.DiffFileHunkHeaders{
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FileHeader: h,
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HunksHeaders: nil,
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}
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continue
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}
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if currentFile == nil {
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// should not happen: we reached the hunk header without first finding the file header.
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return nil, types.ErrHunkNotFound
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}
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if h, ok := ParseDiffHunkHeader(line); ok {
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currentFile.HunksHeaders = append(currentFile.HunksHeaders, h)
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continue
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}
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if headerKey, headerValue := ParseDiffFileExtendedHeader(line); headerKey != "" {
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currentFile.FileHeader.Extensions[headerKey] = headerValue
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continue
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}
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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}
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if currentFile != nil {
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result = append(result, currentFile)
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}
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return result, nil
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}
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