DefaultContextLines is the number of unchanged lines of surrounding context displayed by Unified. Use ToUnified to specify a different value.
const DefaultContextLines = 3
func Apply(src string, edits []Edit) (string, error)
Apply applies a sequence of edits to the src buffer and returns the result. Edits are applied in order of start offset; edits with the same start offset are applied in they order they were provided.
Apply returns an error if any edit is out of bounds, or if any pair of edits is overlapping.
func ApplyBytes(src []byte, edits []Edit) ([]byte, error)
ApplyBytes is like Apply, but it accepts a byte slice. The result is always a new array.
func SortEdits(edits []Edit)
SortEdits orders a slice of Edits by (start, end) offset. This ordering puts insertions (end = start) before deletions (end > start) at the same point, but uses a stable sort to preserve the order of multiple insertions at the same point. (Apply detects multiple deletions at the same point as an error.)
func ToUnified(oldLabel, newLabel, content string, edits []Edit, contextLines int) (string, error)
ToUnified applies the edits to content and returns a unified diff, with contextLines lines of (unchanged) context around each diff hunk. The old and new labels are the names of the content and result files. It returns an error if the edits are inconsistent; see ApplyEdits.
func Unified(oldLabel, newLabel, old, new string) string
Unified returns a unified diff of the old and new strings. The old and new labels are the names of the old and new files. If the strings are equal, it returns the empty string.
An Edit describes the replacement of a portion of a text file.
type Edit struct {
Start, End int // byte offsets of the region to replace
New string // the replacement
}
func Bytes(before, after []byte) []Edit
Bytes computes the differences between two byte slices. The resulting edits respect rune boundaries.
func Strings(before, after string) []Edit
Strings computes the differences between two strings. The resulting edits respect rune boundaries.
func (e Edit) String() string
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