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Fix incorrect comment diff hunk parsing, fix github asset ID nil panic (#35046)

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* Fix missing the first char when parsing diff hunk header
* Fix #35040
* Fix #35049

----

Introduced in
https://github.com/go-gitea/gitea/pull/12047/files#diff-de48c2f70e24ff5603180acf8b5ce9d0356ede8a45bfbf2a485707282ace6d6aR268

Before:

<img width="487" height="167" alt="image"
src="https://github.com/user-attachments/assets/17524c76-a296-4b4b-a4f9-c5150c41bae5"
/>

After:

<img width="749" height="144" alt="image"
src="https://github.com/user-attachments/assets/bcb12c76-c1ae-40f1-81b7-183d15f891db"
/>

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
This commit is contained in:
Lunny Xiao
2025-07-12 06:18:41 +08:00
committed by GitHub
parent 56eccb4995
commit 1352080ef7
3 changed files with 26 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
modules/git/diff.go
View File

@ -99,9 +99,9 @@ func GetRepoRawDiffForFile(repo *Repository, startCommit, endCommit string, diff
return nil
}
// ParseDiffHunkString parse the diffhunk content and return
func ParseDiffHunkString(diffhunk string) (leftLine, leftHunk, rightLine, righHunk int) {
ss := strings.Split(diffhunk, "@@")
// ParseDiffHunkString parse the diff hunk content and return
func ParseDiffHunkString(diffHunk string) (leftLine, leftHunk, rightLine, rightHunk int) {
ss := strings.Split(diffHunk, "@@")
ranges := strings.Split(ss[1][1:], " ")
leftRange := strings.Split(ranges[0], ",")
leftLine, _ = strconv.Atoi(leftRange[0][1:])
@ -112,14 +112,19 @@ func ParseDiffHunkString(diffhunk string) (leftLine, leftHunk, rightLine, righHu
rightRange := strings.Split(ranges[1], ",")
rightLine, _ = strconv.Atoi(rightRange[0])
if len(rightRange) > 1 {
righHunk, _ = strconv.Atoi(rightRange[1])
rightHunk, _ = strconv.Atoi(rightRange[1])
}
} else {
log.Debug("Parse line number failed: %v", diffhunk)
log.Debug("Parse line number failed: %v", diffHunk)
rightLine = leftLine
righHunk = leftHunk
rightHunk = leftHunk
}
return leftLine, leftHunk, rightLine, righHunk
if rightLine == 0 {
// FIXME: GIT-DIFF-CUT-BUG search this tag to see details
// this is only a hacky patch, the rightLine&rightHunk might still be incorrect in some cases.
rightLine++
}
return leftLine, leftHunk, rightLine, rightHunk
}
// Example: @@ -1,8 +1,9 @@ => [..., 1, 8, 1, 9]
@ -270,6 +275,12 @@ func CutDiffAroundLine(originalDiff io.Reader, line int64, old bool, numbersOfLi
oldNumOfLines++
}
}
// "git diff" outputs "@@ -1 +1,3 @@" for "OLD" => "A\nB\nC"
// FIXME: GIT-DIFF-CUT-BUG But there is a bug in CutDiffAroundLine, then the "Patch" stored in the comment model becomes "@@ -1,1 +0,4 @@"
// It may generate incorrect results for difference cases, for example: delete 2 line add 1 line, delete 2 line add 2 line etc, need to double check.
// For example: "L1\nL2" => "A\nB", then the patch shows "L2" as line 1 on the left (deleted part)
// construct the new hunk header
newHunk[headerLines] = fmt.Sprintf("@@ -%d,%d +%d,%d @@",
oldBegin, oldNumOfLines, newBegin, newNumOfLines)