rawlist.js
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/**
* `rawlist` type prompt
*/
var _ = require('lodash');
var util = require('util');
var chalk = require('chalk');
var Base = require('./base');
var Separator = require('../objects/separator');
var observe = require('../utils/events');
var Paginator = require('../utils/paginator');
/**
* Module exports
*/
module.exports = Prompt;
/**
* Constructor
*/
function Prompt() {
Base.apply(this, arguments);
if (!this.opt.choices) {
this.throwParamError('choices');
}
this.opt.validChoices = this.opt.choices.filter(Separator.exclude);
this.selected = 0;
this.rawDefault = 0;
_.extend(this.opt, {
validate: function (val) {
return val != null;
}
});
var def = this.opt.default;
if (_.isNumber(def) && def >= 0 && def < this.opt.choices.realLength) {
this.selected = this.rawDefault = def;
}
// Make sure no default is set (so it won't be printed)
this.opt.default = null;
this.paginator = new Paginator();
}
util.inherits(Prompt, Base);
/**
* Start the Inquiry session
* @param {Function} cb Callback when prompt is done
* @return {this}
*/
Prompt.prototype._run = function (cb) {
this.done = cb;
// Once user confirm (enter key)
var events = observe(this.rl);
var submit = events.line.map(this.getCurrentValue.bind(this));
var validation = this.handleSubmitEvents(submit);
validation.success.forEach(this.onEnd.bind(this));
validation.error.forEach(this.onError.bind(this));
events.keypress.takeUntil(validation.success).forEach(this.onKeypress.bind(this));
// Init the prompt
this.render();
return this;
};
/**
* Render the prompt to screen
* @return {Prompt} self
*/
Prompt.prototype.render = function (error) {
// Render question
var message = this.getQuestion();
var bottomContent = '';
if (this.status === 'answered') {
message += chalk.cyan(this.answer);
} else {
var choicesStr = renderChoices(this.opt.choices, this.selected);
message += this.paginator.paginate(choicesStr, this.selected, this.opt.pageSize);
message += '\n Answer: ';
}
message += this.rl.line;
if (error) {
bottomContent = '\n' + chalk.red('>> ') + error;
}
this.screen.render(message, bottomContent);
};
/**
* When user press `enter` key
*/
Prompt.prototype.getCurrentValue = function (index) {
if (index == null || index === '') {
index = this.rawDefault;
} else {
index -= 1;
}
var choice = this.opt.choices.getChoice(index);
return choice ? choice.value : null;
};
Prompt.prototype.onEnd = function (state) {
this.status = 'answered';
this.answer = state.value;
// Re-render prompt
this.render();
this.screen.done();
this.done(state.value);
};
Prompt.prototype.onError = function () {
this.render('Please enter a valid index');
};
/**
* When user press a key
*/
Prompt.prototype.onKeypress = function () {
var index = this.rl.line.length ? Number(this.rl.line) - 1 : 0;
if (this.opt.choices.getChoice(index)) {
this.selected = index;
} else {
this.selected = undefined;
}
this.render();
};
/**
* Function for rendering list choices
* @param {Number} pointer Position of the pointer
* @return {String} Rendered content
*/
function renderChoices(choices, pointer) {
var output = '';
var separatorOffset = 0;
choices.forEach(function (choice, i) {
output += '\n ';
if (choice.type === 'separator') {
separatorOffset++;
output += ' ' + choice;
return;
}
var index = i - separatorOffset;
var display = (index + 1) + ') ' + choice.name;
if (index === pointer) {
display = chalk.cyan(display);
}
output += display;
});
return output;
}