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Simplify split diff view generation and remove JS dependency (#16775) (#16863) 

Backport #16775

Gitea has relied on some slow JS code to match up added and deleted lines on the
diff pages. This can cause a considerable slow down on large diff pages.

This PR makes a small change meaning that the matching up can occur much more simply.

Partial fix #1351

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2021-08-30 16:43:06 +01:00 committed by GitHub
parent b31307c41c
commit 58f4a4114e
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 109 additions and 75 deletions
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3
modules/repofiles/diff_test.go
View File

@ -83,6 +83,7 @@ func TestGetDiffPreview(t *testing.T) {
{
LeftIdx: 3,
RightIdx: 0,
Match: 4,
Type: 3,
Content: "-Description for repo1",
Comments: nil,
@ -90,6 +91,7 @@ func TestGetDiffPreview(t *testing.T) {
{
LeftIdx: 0,
RightIdx: 3,
Match: 3,
Type: 2,
Content: "+Description for repo1",
Comments: nil,
@ -97,6 +99,7 @@ func TestGetDiffPreview(t *testing.T) {
{
LeftIdx: 0,
RightIdx: 4,
Match: -1,
Type: 2,
Content: "+this is a new line",
Comments: nil,

18
services/gitdiff/gitdiff.go
View File

@ -75,6 +75,7 @@ const (
type DiffLine struct {
LeftIdx int
RightIdx int
Match int
Type DiffLineType
Content string
Comments []*models.Comment
@ -943,6 +944,7 @@ func parseHunks(curFile *DiffFile, maxLines, maxLineCharacters int, input *bufio
curFileLFSPrefix bool
)
lastLeftIdx := -1
leftLine, rightLine := 1, 1
for {
@ -1027,13 +1029,21 @@ func parseHunks(curFile *DiffFile, maxLines, maxLineCharacters int, input *bufio
curFile.IsIncomplete = true
continue
}
diffLine := &DiffLine{Type: DiffLineAdd, RightIdx: rightLine}
diffLine := &DiffLine{Type: DiffLineAdd, RightIdx: rightLine, Match: -1}
rightLine++
if curSection == nil {
// Create a new section to represent this hunk
curSection = &DiffSection{}
curFile.Sections = append(curFile.Sections, curSection)
}
if lastLeftIdx > -1 {
diffLine.Match = lastLeftIdx
curSection.Lines[lastLeftIdx].Match = len(curSection.Lines)
lastLeftIdx++
if lastLeftIdx >= len(curSection.Lines) || curSection.Lines[lastLeftIdx].Type != DiffLineDel {
lastLeftIdx = -1
}
}
curSection.Lines = append(curSection.Lines, diffLine)
case '-':
curFileLinesCount++
@ -1042,7 +1052,7 @@ func parseHunks(curFile *DiffFile, maxLines, maxLineCharacters int, input *bufio
curFile.IsIncomplete = true
continue
}
diffLine := &DiffLine{Type: DiffLineDel, LeftIdx: leftLine}
diffLine := &DiffLine{Type: DiffLineDel, LeftIdx: leftLine, Match: -1}
if leftLine > 0 {
leftLine++
}
@ -1051,6 +1061,9 @@ func parseHunks(curFile *DiffFile, maxLines, maxLineCharacters int, input *bufio
curSection = &DiffSection{}
curFile.Sections = append(curFile.Sections, curSection)
}
if len(curSection.Lines) == 0 || curSection.Lines[len(curSection.Lines)-1].Type != DiffLineDel {
lastLeftIdx = len(curSection.Lines)
}
curSection.Lines = append(curSection.Lines, diffLine)
case ' ':
curFileLinesCount++
@ -1061,6 +1074,7 @@ func parseHunks(curFile *DiffFile, maxLines, maxLineCharacters int, input *bufio
diffLine := &DiffLine{Type: DiffLinePlain, LeftIdx: leftLine, RightIdx: rightLine}
leftLine++
rightLine++
lastLeftIdx = -1
if curSection == nil {
// Create a new section to represent this hunk
curSection = &DiffSection{}

28
templates/repo/diff/box.tmpl
View File

@ -154,33 +154,5 @@
{{end}}
{{template "repo/issue/view_content/reference_issue_dialog" .}}
{{if .IsSplitStyle}}
<script>
document.addEventListener('DOMContentLoaded', () => {
$('tr.add-code').each(function() {
let prev = $(this).prev();
if (prev.is('.del-code') && prev.children().eq(5).text().trim() === '') {
while (prev.prev().is('.del-code') && prev.prev().children().eq(5).text().trim() === '') {
prev = prev.prev();
}
prev.children().eq(3).attr('data-line-num', $(this).children().eq(3).attr('data-line-num'));
prev.children().eq(3).html($(this).children().eq(3).html());
prev.children().eq(4).html($(this).children().eq(4).html());
prev.children().eq(5).html($(this).children().eq(5).html());
prev.children().eq(0).addClass('del-code');
prev.children().eq(1).addClass('del-code');
prev.children().eq(2).addClass('del-code');
prev.children().eq(3).addClass('add-code');
prev.children().eq(4).addClass('add-code');
prev.children().eq(5).addClass('add-code');
$(this).remove();
}
});
});
</script>
{{end}}
</div>
{{end}}

47
templates/repo/diff/section_split.tmpl
View File

@ -1,6 +1,8 @@
{{$file := .file}}
{{range $j, $section := $file.Sections}}
{{range $k, $line := $section.Lines}}
{{$hasmatch := ne $line.Match -1}}
{{if or (ne .GetType 2) (not $hasmatch)}}
<tr class="{{DiffLineTypeToStr .GetType}}-code nl-{{$k}} ol-{{$k}}" data-line-type="{{DiffLineTypeToStr .GetType}}">
{{if eq .GetType 4}}
<td class="lines-num lines-num-old">
@ -21,6 +23,14 @@
{{end}}
</td>
<td colspan="5" class="lines-code lines-code-old "><code class="code-inner">{{$section.GetComputedInlineDiffFor $line}}</span></td>
{{else if and (eq .GetType 3) $hasmatch}}{{/* DEL */}}
{{$match := index $section.Lines $line.Match}}
<td class="lines-num lines-num-old del-code" data-line-num="{{$line.LeftIdx}}"><span rel="diff-{{Sha1 $file.Name}}L{{$line.LeftIdx}}"></span></td>
<td class="lines-type-marker lines-type-marker-old del-code"><span class="mono" data-type-marker="{{$line.GetLineTypeMarker}}"></span></td>
<td class="lines-code lines-code-old halfwidth del-code">{{if and $.root.SignedUserID $.root.PageIsPullFiles}}<a class="ui primary button add-code-comment add-code-comment-left{{if (not $line.CanComment)}} invisible{{end}}" data-path="{{$file.Name}}" data-side="left" data-idx="{{$line.LeftIdx}}" data-new-comment-url="{{$.root.Issue.HTMLURL}}/files/reviews/new_comment">{{svg "octicon-plus"}}</a>{{end}}<code class="code-inner">{{if $line.LeftIdx}}{{$section.GetComputedInlineDiffFor $line}}{{end}}</code></td>
<td class="lines-num lines-num-new add-code" data-line-num="{{if $match.RightIdx}}{{$match.RightIdx}}{{end}}"><span rel="{{if $match.RightIdx}}diff-{{Sha1 $file.Name}}R{{$match.RightIdx}}{{end}}"></span></td>
<td class="lines-type-marker lines-type-marker-new add-code">{{if $match.RightIdx}}<span class="mono" data-type-marker="{{$match.GetLineTypeMarker}}"></span>{{end}}</td>
<td class="lines-code lines-code-new halfwidth add-code">{{if and $.root.SignedUserID $.root.PageIsPullFiles}}<a class="ui primary button add-code-comment add-code-comment-right{{if (not $match.CanComment)}} invisible{{end}}" data-path="{{$file.Name}}" data-side="right" data-idx="{{$match.RightIdx}}" data-new-comment-url="{{$.root.Issue.HTMLURL}}/files/reviews/new_comment">{{svg "octicon-plus"}}</a>{{end}}<code class="code-inner">{{if $match.RightIdx}}{{$section.GetComputedInlineDiffFor $match}}{{end}}</code></td>
{{else}}
<td class="lines-num lines-num-old" data-line-num="{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}"><span rel="{{if $line.LeftIdx}}diff-{{Sha1 $file.Name}}L{{$line.LeftIdx}}{{end}}"></span></td>
<td class="lines-type-marker lines-type-marker-old">{{if $line.LeftIdx}}<span class="mono" data-type-marker="{{$line.GetLineTypeMarker}}"></span>{{end}}</td>
@ -30,14 +40,48 @@
<td class="lines-code lines-code-new halfwidth">{{if and $.root.SignedUserID $.root.PageIsPullFiles (not (eq .GetType 3))}}<a class="ui primary button add-code-comment add-code-comment-right{{if (not $line.CanComment)}} invisible{{end}}" data-path="{{$file.Name}}" data-side="right" data-idx="{{$line.RightIdx}}" data-new-comment-url="{{$.root.Issue.HTMLURL}}/files/reviews/new_comment">{{svg "octicon-plus"}}</a>{{end}}<code class="code-inner">{{if $line.RightIdx}}{{$section.GetComputedInlineDiffFor $line}}{{end}}</code></td>
{{end}}
</tr>
{{if gt (len $line.Comments) 0}}
{{if and (eq .GetType 3) $hasmatch}}
{{$match := index $section.Lines $line.Match}}
{{if or (gt (len $line.Comments) 0) (gt (len $match.Comments) 0)}}
<tr class="add-comment" data-line-type="{{DiffLineTypeToStr .GetType}}">
<td class="lines-num"></td>
<td class="lines-type-marker"></td>
<td class="add-comment-left">
{{if gt (len $line.Comments) 0}}
{{if eq $line.GetCommentSide "previous"}}
{{template "repo/diff/conversation" mergeinto $.root "comments" $line.Comments}}
{{end}}
{{end}}
{{if gt (len $match.Comments) 0}}
{{if eq $match.GetCommentSide "previous"}}
{{template "repo/diff/conversation" mergeinto $.root "comments" $match.Comments}}
{{end}}
{{end}}
</td>
<td class="lines-num"></td>
<td class="lines-type-marker"></td>
<td class="add-comment-right">
{{if eq $line.GetCommentSide "proposed"}}
{{template "repo/diff/conversation" mergeinto $.root "comments" $line.Comments}}
{{end}}
{{if gt (len $match.Comments) 0}}
{{if eq $match.GetCommentSide "proposed"}}
{{template "repo/diff/conversation" mergeinto $.root "comments" $match.Comments}}
{{end}}
{{end}}
</td>
</tr>
{{end}}
{{else if gt (len $line.Comments) 0}}
<tr class="add-comment" data-line-type="{{DiffLineTypeToStr .GetType}}">
<td class="lines-num"></td>
<td class="lines-type-marker"></td>
<td class="add-comment-left">
{{if gt (len $line.Comments) 0}}
{{if eq $line.GetCommentSide "previous"}}
{{template "repo/diff/conversation" mergeinto $.root "comments" $line.Comments}}
{{end}}
{{end}}
</td>
<td class="lines-num"></td>
<td class="lines-type-marker"></td>
@ -50,3 +94,4 @@
{{end}}
{{end}}
{{end}}
{{end}}