modified

node_modules/enquirer/lib/completer.js

@@ -0,0 +1,52 @@
+'use strict';
+
+const unique = arr => arr.filter((v, i) => arr.lastIndexOf(v) === i);
+const compact = arr => unique(arr).filter(Boolean);
+
+module.exports = (action, data = {}, value = '') => {
+  let { past = [], present = '' } = data;
+  let rest, prev;
+
+  switch (action) {
+    case 'prev':
+    case 'undo':
+      rest = past.slice(0, past.length - 1);
+      prev = past[past.length - 1] || '';
+      return {
+        past: compact([value, ...rest]),
+        present: prev
+      };
+
+    case 'next':
+    case 'redo':
+      rest = past.slice(1);
+      prev = past[0] || '';
+      return {
+        past: compact([...rest, value]),
+        present: prev
+      };
+
+    case 'save':
+      return {
+        past: compact([...past, value]),
+        present: ''
+      };
+
+    case 'remove':
+      prev = compact(past.filter(v => v !== value));
+      present = '';
+
+      if (prev.length) {
+        present = prev.pop();
+      }
+
+      return {
+        past: prev,
+        present
+      };
+
+    default: {
+      throw new Error(`Invalid action: "${action}"`);
+    }
+  }
+};