Renamed unique_append to uniqueAppend

regex/misc.go

@@ -50,7 +50,7 @@ func isNormalChar(c rune) bool {
 
 // Ensure that the given elements are only appended to the given slice if they
 // don't already exist. Returns the new slice, and the number of unique items appended.
-func unique_append[T comparable](slc []T, items ...T) ([]T, int) {
+func uniqueAppend[T comparable](slc []T, items ...T) ([]T, int) {
 	num_appended := 0
 	for _, item := range items {
 		if !slices.Contains(slc, item) {
@@ -61,6 +61,25 @@ func unique_append[T comparable](slc []T, items ...T) ([]T, int) {
 	return slc, num_appended
 }
 
+func uniqueAppendFunc[T any](slc []T, fn func(T, T) bool, items ...T) ([]T, int) {
+	toRet := make([]T, len(slc))
+	num_appended := 0
+	copy(toRet, slc)
+	for _, item := range items {
+		itemExists := false
+		for _, val := range slc {
+			if fn(item, val) {
+				itemExists = true
+			}
+		}
+		if !itemExists {
+			toRet = append(toRet, item)
+			num_appended++
+		}
+	}
+	return toRet, num_appended
+}
+
 // Returns true only if all the given elements are equal
 func allEqual[T comparable](items ...T) bool {
 	first := items[0]