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'use strict'; var _ = require('lodash'); var chalk = require('chalk'); /** * The paginator keeps track of a pointer index in a list and returns * a subset of the choices if the list is too long. */ class Paginator { constructor(screen) { this.pointer = 0; this.lastIndex = 0; this.screen = screen; } paginate(output, active, pageSize) { pageSize = pageSize || 7; var middleOfList = Math.floor(pageSize / 2); var lines = output.split('\n'); if (this.screen) { lines = this.screen.breakLines(lines); active = _.sum(lines.map(lineParts => lineParts.length).splice(0, active)); lines = _.flatten(lines); } // Make sure there's enough lines to paginate if (lines.length <= pageSize) { return output; } // Move the pointer only when the user go down and limit it to the middle of the list if ( this.pointer < middleOfList && this.lastIndex < active && active - this.lastIndex < pageSize ) { this.pointer = Math.min(middleOfList, 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)'); } } module.exports = Paginator;
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