Add --normalize option to normalize latin script characters

Close #790

src/options.go

@@ -24,6 +24,7 @@ const usage = `usage: fzf [options]
     --algo=TYPE           Fuzzy matching algorithm: [v1|v2] (default: v2)
     -i                    Case-insensitive match (default: smart-case match)
     +i                    Case-sensitive match
+    --normalize           Normalize latin script letters before matching
     -n, --nth=N[,..]      Comma-separated list of field index expressions
                           for limiting search scope. Each can be a non-zero
                           integer or a range expression ([BEGIN]..[END]).
@@ -138,6 +139,7 @@ type Options struct {
 	FuzzyAlgo   algo.Algo
 	Extended    bool
 	Case        Case
+	Normalize   bool
 	Nth         []Range
 	WithNth     []Range
 	Delimiter   Delimiter
@@ -185,6 +187,7 @@ func defaultOptions() *Options {
 		FuzzyAlgo:   algo.FuzzyMatchV2,
 		Extended:    true,
 		Case:        CaseSmart,
+		Normalize:   false,
 		Nth:         make([]Range, 0),
 		WithNth:     make([]Range, 0),
 		Delimiter:   Delimiter{},
@@ -887,6 +890,10 @@ func parseOptions(opts *Options, allArgs []string) {
 		case "-f", "--filter":
 			filter := nextString(allArgs, &i, "query string required")
 			opts.Filter = &filter
+		case "--normalize":
+			opts.Normalize = true
+		case "--no-normalize":
+			opts.Normalize = false
 		case "--algo":
 			opts.FuzzyAlgo = parseAlgo(nextString(allArgs, &i, "algorithm required (v1|v2)"))
 		case "--expect":