feat: progress

pkg/iterator/iterator.go

@@ -1,86 +0,0 @@
-/*
-Package "iterator"
-*/
-package iterator
-
-import "fmt"
-
-// An iterator over slices.
-type Iterator[T any] struct {
-	items []T
-	index int
-}
-
-// Create a new iterator, over a set of items.
-func Of[T any](items []T) *Iterator[T] {
-	return &Iterator[T]{items: items, index: 0}
-}
-
-// Returns the current position of the iterator.
-func (i Iterator[T]) Index() int {
-	return i.index
-}
-
-func (i Iterator[T]) Copy() *Iterator[T] {
-	return &Iterator[T]{items: i.items, index: i.index}
-}
-
-func (i *Iterator[T]) Sync(o *Iterator[T]) {
-	i.index = o.index
-}
-
-// Create a new iterator, over a set of items.
-func (i Iterator[T]) Get() (T, error) {
-	var null T
-	if i.Done() {
-		return null, fmt.Errorf("iterator is exhausted")
-	}
-
-	return i.items[i.index], nil
-}
-
-func (i Iterator[T]) MustGet() T {
-	var null T
-	if i.Done() {
-		return null
-	}
-
-	return i.items[i.index]
-}
-
-func (i *Iterator[T]) Forward() {
-	if !i.Done() {
-		i.index++
-	}
-}
-
-// Create a new iterator, over a set of items.
-func (i *Iterator[T]) Next() (T, error) {
-	item, err := i.Get()
-	if err == nil {
-		i.index++
-	}
-
-	return item, err
-}
-
-// Create a new iterator, over a set of items.
-func (i *Iterator[T]) Back() {
-	i.index = max(i.index-1, 0)
-}
-
-// Returns the current position of the iterator.
-func (i Iterator[T]) Done() bool {
-	return i.index == len(i.items)
-}
-
-func Do[T any, U any](i *Iterator[T], fn func(i *Iterator[T]) (U, error)) (U, error) {
-	i2 := i.Copy()
-
-	out, err := fn(i2)
-	if err == nil {
-		i.Sync(i2)
-	}
-
-	return out, err
-}