Add vendor

Specifically because I want to modify a dependency

vendor/github.com/charmbracelet/bubbles/textarea/memoization/memoization.go

@@ -0,0 +1,123 @@
+package memoization
+
+import (
+	"container/list"
+	"crypto/sha256"
+	"fmt"
+	"sync"
+)
+
+// Hasher is an interface that requires a Hash method. The Hash method is
+// expected to return a string representation of the hash of the object.
+type Hasher interface {
+	Hash() string
+}
+
+// entry is a struct that holds a key-value pair. It is used as an element
+// in the evictionList of the MemoCache.
+type entry[T any] struct {
+	key   string
+	value T
+}
+
+// MemoCache is a struct that represents a cache with a set capacity. It
+// uses an LRU (Least Recently Used) eviction policy. It is safe for
+// concurrent use.
+type MemoCache[H Hasher, T any] struct {
+	capacity      int
+	mutex         sync.Mutex
+	cache         map[string]*list.Element // The cache holding the results
+	evictionList  *list.List               // A list to keep track of the order for LRU
+	hashableItems map[string]T             // This map keeps track of the original hashable items (optional)
+}
+
+// NewMemoCache is a function that creates a new MemoCache with a given
+// capacity. It returns a pointer to the created MemoCache.
+func NewMemoCache[H Hasher, T any](capacity int) *MemoCache[H, T] {
+	return &MemoCache[H, T]{
+		capacity:      capacity,
+		cache:         make(map[string]*list.Element),
+		evictionList:  list.New(),
+		hashableItems: make(map[string]T),
+	}
+}
+
+// Capacity is a method that returns the capacity of the MemoCache.
+func (m *MemoCache[H, T]) Capacity() int {
+	return m.capacity
+}
+
+// Size is a method that returns the current size of the MemoCache. It is
+// the number of items currently stored in the cache.
+func (m *MemoCache[H, T]) Size() int {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	return m.evictionList.Len()
+}
+
+// Get is a method that returns the value associated with the given
+// hashable item in the MemoCache. If there is no corresponding value, the
+// method returns nil.
+func (m *MemoCache[H, T]) Get(h H) (T, bool) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	hashedKey := h.Hash()
+	if element, found := m.cache[hashedKey]; found {
+		m.evictionList.MoveToFront(element)
+		return element.Value.(*entry[T]).value, true
+	}
+	var result T
+	return result, false
+}
+
+// Set is a method that sets the value for the given hashable item in the
+// MemoCache. If the cache is at capacity, it evicts the least recently
+// used item before adding the new item.
+func (m *MemoCache[H, T]) Set(h H, value T) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	hashedKey := h.Hash()
+	if element, found := m.cache[hashedKey]; found {
+		m.evictionList.MoveToFront(element)
+		element.Value.(*entry[T]).value = value
+		return
+	}
+
+	// Check if the cache is at capacity
+	if m.evictionList.Len() >= m.capacity {
+		// Evict the least recently used item from the cache
+		toEvict := m.evictionList.Back()
+		if toEvict != nil {
+			evictedEntry := m.evictionList.Remove(toEvict).(*entry[T])
+			delete(m.cache, evictedEntry.key)
+			delete(m.hashableItems, evictedEntry.key) // if you're keeping track of original items
+		}
+	}
+
+	// Add the value to the cache and the evictionList
+	newEntry := &entry[T]{
+		key:   hashedKey,
+		value: value,
+	}
+	element := m.evictionList.PushFront(newEntry)
+	m.cache[hashedKey] = element
+	m.hashableItems[hashedKey] = value // if you're keeping track of original items
+}
+
+// HString is a type that implements the Hasher interface for strings.
+type HString string
+
+// Hash is a method that returns the hash of the string.
+func (h HString) Hash() string {
+	return fmt.Sprintf("%x", sha256.Sum256([]byte(h)))
+}
+
+// HInt is a type that implements the Hasher interface for integers.
+type HInt int
+
+// Hash is a method that returns the hash of the integer.
+func (h HInt) Hash() string {
+	return fmt.Sprintf("%x", sha256.Sum256([]byte(fmt.Sprintf("%d", h))))
+}