生成package.json的简单实现

默认分类 2014/11/08 19:35

代码如下：

// [Example]
// {
//   "name": "npm-init",
//   "version": "0.0.0",
//   "description": "This is npm-init",
//   "main": "index.js",
//   "author": "haiyang2014"
// }

/* jshint browser: false */
'use strict';
var fs = require('fs');
var path = require('path');

var readline = require('readline');

var rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

var pkg;
var ctx;

var pkgjson_src = path.resolve(__dirname, 'package.json');
var basename = path.basename(path.dirname(pkgjson_src));

var pkgjson = [
    'name', basename,
    'version', '0.0.0',
    'description', 'This is ' + basename,
    'main', 'index.js',
    // 'test', 'echo "Error: no test specified" && exit 1',
    // 'repository', 'git|http://github.com/' + basename,
    // 'keywords', 'javascript|node',
    // 'license', 'ISC',
    'author', 'haiyang2014'
];

var pkgdata = {};
for (var i = 0, len = pkgjson.length; i < len; i += 2) {
    pkgdata[pkgjson[i]] = pkgjson[i + 1];
}

function readPkgJson() {
    fs.readFile(pkgjson_src, 'utf8', function (er, d) {
        if (er) ctx = {};
        try {
            ctx = JSON.parse(d);
            pkg = JSON.parse(d);
        }
        catch (e) {
            ctx = {};
        }

        for (var i in ctx) {
            pkgdata[i] = ctx[i];
        }

        console.log(ctx);

        console.log([
            'This utility will walk you through creating a package.json file.',
            'It only covers the most common items, and tries to guess sane defaults.',
            '',
            'See `npm help json` for definitive documentation on these fields',
            'and exactly what they do.',
            '',
            'Use `npm install <pkg> --save` afterwards to install a package and',
            'save it as a dependency in the package.json file.',
            '',
            'Press ^C at any time to quit.'
        ].join('\n'));


        promptPkgjson.index = 0;
        promptPkgjson();

    });
}



function promptPkgjson() {
    var k = pkgjson[promptPkgjson.index],
        v = pkgjson[promptPkgjson.index + 1];
    rl.question(k + ': ' + (!!v ? '(' + v + ') ' : ''), function (answer) {
        pkgdata[pkgjson[promptPkgjson.index]] = answer || pkgjson[promptPkgjson.index + 1];

        promptPkgjson.index += 2;
        if (promptPkgjson.index >= pkgjson.length) {
            finishPrompt();
        }
        else {
            promptPkgjson();
        }

    });
}
promptPkgjson.index = 0;

function finishPrompt() {
    var d = JSON.stringify(pkgdata, null, 2) + '\n';
    console.log('About to write to %s:\n\n%s\n', pkgjson_src, d);
    rl.question('Is this ok? (yes)', function (ok) {
        rl.close();

        ok = String(ok).toLowerCase().trim();
        if (ok && ok.charAt(0) !== 'y') {
            console.log('Aborted.');
        }
        else {
            fs.writeFile(pkgjson_src, d, 'utf8', function (er) {
                if (er) throw er;
                console.log('ok');
            });
        }
    });
}

readPkgJson();

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