mirror of https://github.com/harness/drone.git
92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
// Copyright 2023 Harness, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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)
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type DiffFileHunkHeaders struct {
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FileHeader DiffFileHeader
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HunksHeaders []HunkHeader
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}
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var regExpDiffFileHeader = regexp.MustCompile(`^diff --git a/(.+) b/(.+)$`)
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func ParseDiffFileHeader(line string) (DiffFileHeader, bool) {
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groups := regExpDiffFileHeader.FindStringSubmatch(line)
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if groups == nil {
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return DiffFileHeader{}, false
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}
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return 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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// 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) ([]*DiffFileHunkHeaders, error) {
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scanner := bufio.NewScanner(r)
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var currentFile *DiffFileHunkHeaders
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var result []*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 = &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, 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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