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133 lines
3.5 KiB
133 lines
3.5 KiB
/*
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* pkginfo.js: Top-level include for the pkginfo module
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*
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* (C) 2011, Charlie Robbins
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*
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*/
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var path = require('path');
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//
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// ### function pkginfo ([options, 'property', 'property' ..])
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// #### @pmodule {Module} Parent module to read from.
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// #### @options {Object|Array|string} **Optional** Options used when exposing properties.
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// #### @arguments {string...} **Optional** Specified properties to expose.
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// Exposes properties from the package.json file for the parent module on
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// it's exports. Valid usage:
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//
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// `require('pkginfo')()`
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//
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// `require('pkginfo')('version', 'author');`
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//
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// `require('pkginfo')(['version', 'author']);`
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//
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// `require('pkginfo')({ include: ['version', 'author'] });`
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//
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var pkginfo = module.exports = function (pmodule, options) {
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var args = [].slice.call(arguments, 2).filter(function (arg) {
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return typeof arg === 'string';
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});
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//
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// **Parse variable arguments**
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//
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if (Array.isArray(options)) {
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//
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// If the options passed in is an Array assume that
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// it is the Array of properties to expose from the
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// on the package.json file on the parent module.
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//
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options = { include: options };
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}
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else if (typeof options === 'string') {
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//
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// Otherwise if the first argument is a string, then
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// assume that it is the first property to expose from
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// the package.json file on the parent module.
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//
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options = { include: [options] };
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}
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//
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// **Setup default options**
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//
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options = options || {};
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// ensure that includes have been defined
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options.include = options.include || [];
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if (args.length > 0) {
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//
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// If additional string arguments have been passed in
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// then add them to the properties to expose on the
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// parent module.
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//
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options.include = options.include.concat(args);
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}
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var pkg = pkginfo.read(pmodule, options.dir).package;
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Object.keys(pkg).forEach(function (key) {
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if (options.include.length > 0 && !~options.include.indexOf(key)) {
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return;
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}
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if (!pmodule.exports[key]) {
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pmodule.exports[key] = pkg[key];
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}
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});
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return pkginfo;
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};
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//
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// ### function find (dir)
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// #### @pmodule {Module} Parent module to read from.
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// #### @dir {string} **Optional** Directory to start search from.
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// Searches up the directory tree from `dir` until it finds a directory
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// which contains a `package.json` file.
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//
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pkginfo.find = function (pmodule, dir) {
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if (! dir) {
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dir = path.dirname(pmodule.filename || pmodule.id);
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}
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if (dir === path.dirname(dir)) {
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throw new Error('Could not find package.json up from ' +
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(pmodule.filename || pmodule.id));
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}
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else if (!dir || dir === '.') {
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throw new Error('Cannot find package.json from unspecified directory');
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}
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var contents;
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try {
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contents = require(dir + '/package.json');
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} catch (error) {}
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if (contents) return contents;
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return pkginfo.find(pmodule, path.dirname(dir));
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};
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//
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// ### function read (pmodule, dir)
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// #### @pmodule {Module} Parent module to read from.
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// #### @dir {string} **Optional** Directory to start search from.
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// Searches up the directory tree from `dir` until it finds a directory
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// which contains a `package.json` file and returns the package information.
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//
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pkginfo.read = function (pmodule, dir) {
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return {
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dir: dir,
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package: pkginfo.find(pmodule, dir),
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};
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};
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//
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// Call `pkginfo` on this module and expose version.
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//
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pkginfo(module, {
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dir: __dirname,
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include: ['version'],
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target: pkginfo
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});
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