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'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) { var 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)'); };
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