first commit

build/node_modules/inquirer/lib/utils/paginator.js

@@ -0,0 +1,38 @@
+'use strict';
+
+var _ = require('lodash');
+var chalk = require('chalk');
+
+
+/**
+ * The paginator keep trakcs of a pointer index in a list and return
+ * a subset of the choices if the list is too long.
+ */
+
+var Paginator = module.exports = function () {
+  this.pointer = 0;
+  this.lastIndex = 0;
+};
+
+Paginator.prototype.paginate = function (output, active, pageSize) {
+  var pageSize = pageSize || 7;
+  var lines = output.split('\n');
+
+  // Make sure there's enough lines to paginate
+  if (lines.length <= pageSize + 2) {
+    return output;
+  }
+
+  // Move the pointer only when the user go down and limit it to 3
+  if (this.pointer < 3 && this.lastIndex < active && active - this.lastIndex < 9) {
+    this.pointer = Math.min(3, this.pointer + active - this.lastIndex);
+  }
+  this.lastIndex = active;
+
+  // Duplicate the lines so it give an infinite list look
+  var infinite = _.flatten([lines, lines, lines]);
+  var topIndex = Math.max(0, active + lines.length - this.pointer);
+
+  var section = infinite.splice(topIndex, pageSize).join('\n');
+  return section + '\n' + chalk.dim('(Move up and down to reveal more choices)');
+};