Method transformHunkHeader

pkg/commands/patch/transform.go:207–227

(newBodyLines []*PatchLine, oldStart int, startOffset int)

}

func (self *patchTransformer) transformHunkHeader(newBodyLines []*PatchLine, oldStart int, startOffset int) (int, int) {
	oldLength := nLinesWithKind(newBodyLines, []PatchLineKind{CONTEXT, DELETION})
	newLength := nLinesWithKind(newBodyLines, []PatchLineKind{CONTEXT, ADDITION})

	var newStartOffset int
	// if the hunk went from zero to positive length, we need to increment the starting point by one
	// if the hunk went from positive to zero length, we need to decrement the starting point by one
	if oldLength == 0 {
		newStartOffset = 1
	} else if newLength == 0 {
		newStartOffset = -1
	} else {
		newStartOffset = 0
	}

	newStart := oldStart + startOffset + newStartOffset

	newStartOffset = startOffset + newLength - oldLength

	return newStart, newStartOffset
}