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68 lines
1.7 KiB
68 lines
1.7 KiB
var Chainsaw = require('chainsaw');
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var Lazy = require('lazy');
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module.exports = Prompt;
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function Prompt (stream) {
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var waiting = [];
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var lines = [];
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var lazy = Lazy(stream).lines.map(String)
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.forEach(function (line) {
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if (waiting.length) {
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var w = waiting.shift();
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w(line);
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}
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else lines.push(line);
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})
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;
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var vars = {};
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return Chainsaw(function (saw) {
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this.getline = function (f) {
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var g = function (line) {
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saw.nest(f, line, vars);
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};
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if (lines.length) g(lines.shift());
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else waiting.push(g);
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};
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this.do = function (cb) {
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saw.nest(cb, vars);
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};
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});
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}
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var util = require('util');
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if (__filename === process.argv[1]) {
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var stdin = process.openStdin();
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Prompt(stdin)
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.do(function () {
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util.print('x = ');
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})
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.getline(function (line, vars) {
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vars.x = parseInt(line, 10);
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})
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.do(function () {
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util.print('y = ');
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})
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.getline(function (line, vars) {
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vars.y = parseInt(line, 10);
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})
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.do(function (vars) {
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if (vars.x + vars.y < 10) {
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util.print('z = ');
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this.getline(function (line) {
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vars.z = parseInt(line, 10);
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})
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}
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else {
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vars.z = 0;
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}
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})
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.do(function (vars) {
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console.log('x + y + z = ' + (vars.x + vars.y + vars.z));
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process.exit();
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})
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;
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}
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