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Backport: Fix regex to support optional end line of old section in diff hunk #5097

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merged 1 commit into from Oct 18, 2018
Merged

Backport: Fix regex to support optional end line of old section in diff hunk #5097

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25 changes: 16 additions & 9 deletions models/git_diff.go
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Expand Up @@ -273,7 +273,7 @@ func (diff *Diff) NumFiles() int {
}

// Example: @@ -1,8 +1,9 @@ => [..., 1, 8, 1, 9]
var hunkRegex = regexp.MustCompile(`^@@ -([0-9]+),([0-9]+) \+([0-9]+)(,([0-9]+))? @@`)
var hunkRegex = regexp.MustCompile(`^@@ -(?P<beginOld>[0-9]+)(,(?P<endOld>[0-9]+))? \+(?P<beginNew>[0-9]+)(,(?P<endNew>[0-9]+))? @@`)

func isHeader(lof string) bool {
return strings.HasPrefix(lof, cmdDiffHead) || strings.HasPrefix(lof, "---") || strings.HasPrefix(lof, "+++")
Expand Down Expand Up @@ -311,21 +311,28 @@ func CutDiffAroundLine(originalDiff io.Reader, line int64, old bool, numbersOfLi
if len(hunk) > headerLines {
break
}
groups := hunkRegex.FindStringSubmatch(lof)
// A map with named groups of our regex to recognize them later more easily
submatches := hunkRegex.FindStringSubmatch(lof)
groups := make(map[string]string)
for i, name := range hunkRegex.SubexpNames() {
if i != 0 && name != "" {
groups[name] = submatches[i]
}
}
if old {
begin = com.StrTo(groups[1]).MustInt64()
end = com.StrTo(groups[2]).MustInt64()
begin = com.StrTo(groups["beginOld"]).MustInt64()
end = com.StrTo(groups["endOld"]).MustInt64()
// init otherLine with begin of opposite side
otherLine = com.StrTo(groups[3]).MustInt64()
otherLine = com.StrTo(groups["beginNew"]).MustInt64()
} else {
begin = com.StrTo(groups[3]).MustInt64()
if groups[5] != "" {
end = com.StrTo(groups[5]).MustInt64()
begin = com.StrTo(groups["beginNew"]).MustInt64()
if groups["endNew"] != "" {
end = com.StrTo(groups["endNew"]).MustInt64()
} else {
end = 0
}
// init otherLine with begin of opposite side
otherLine = com.StrTo(groups[1]).MustInt64()
otherLine = com.StrTo(groups["beginOld"]).MustInt64()
}
end += begin // end is for real only the number of lines in hunk
// lof is between begin and end
Expand Down