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func FormatUnified ¶

func FormatUnified(path string, r Result) string

func FormatUnifiedAt ¶

func FormatUnifiedAt(path string, r Result, oldStart, newStart, context int) string

func Stats ¶

func Stats(r Result) (insertions, deletions int)

func TruncateUTF8 ¶

func TruncateUTF8(s string, maxBytes int) string

TruncateUTF8 returns the longest prefix of s that is valid UTF-8 and at most maxBytes long; a non-positive maxBytes is treated as no limit, so a valid s is returned whole. It walks the window forward with utf8.DecodeRuneInString, so a long valid prefix followed by an invalid byte costs O(n) instead of the O(n^2) rescans of the previous trim-one-byte loop. A decoded U+FFFD with size 3 is a genuine replacement character and does not stop the walk; only RuneError with size 1 (an invalid or truncated sequence) does. The walk runs even when s already fits maxBytes, so a short input containing an invalid byte is cut back to its longest valid prefix rather than returned whole.