Sha256: 8d83c8ee10da0248212264a86863adf530e5322264a016dd3108b16aaf79e75e
Contents?: true
Size: 1.45 KB
Versions: 47
Compression:
Stored size: 1.45 KB
Contents
'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;
Version data entries
47 entries across 46 versions & 3 rubygems