我注意到的第一件事是重新声明fs
变量。第 2 行是 Node 的文件系统模块,第 4 行是(如果你问我new Array()
应该是)。[]
我也不确定什么是walker
模块,因为它的github repo被删除并且npm 包已经过时,我建议你使用原始文件系统模块API 来列出文件,可能是路径模块来处理你的文件位置和一些异步来粘合它一起:
// `npm install async` first.
// https://github.com/caolan/async
var fs = require('fs');
var async = require('async');
// Lists directory entries in @dir,
// filters those which names ends with @extension.
// calls callback with (err, array of strings).
//
// FIXME:
// Mathes directories - solution is fs.stat()
// (could also sort here by mtime).
function listFiles(dir, extension, callback) {
fs.readdir(dir, function(err, files) {
if (err) {
console.error('Failed to list files in `%s`: %s', dir, err);
return callback(err);
}
var slicePos = -extension.length;
callback(null, files.filter(function(filename) {
return (extension == filename.slice(slicePos))
}));
});
}
// Sorts markdown based on date entry.
// Should be based on `mtime`, I think,
// since reading whole file isn't great idea.
// (See fs.Stats.)
// At lease add caching or something, you'll figure :)
//
// Also, you better get yourself a nice markdown parser,
// but for brevity I assume that first 2 lines are:
// Title: Some Title
// Date: Valid Javascript Datestring
function sortMarkdown(pathes, callback) {
async.sortBy(pathes, function(fileName, cb) {
// Following line is dirty!
// You should probably pass absolute pathes here
// to avoid errors. Path and Fs modules are your friends.
var md = __dirname + '/blogs/' + fileName;
fs.readFile(md, 'utf8', function(err, markdown) {
if (err) {
console.error('Failed to read `%s`: %s', md, err);
return cb(err);
}
// Get second line of md.
var date = markdown.split('\n')[1];
// Get datestring with whitespaces removed.
date = date.split(':')[1].trim();
// Get timestamp. Change with -ts
// to reverse sorting order.
var ts = Date.parse(date);
// Tell async how to sort; for details, see:
// https://github.com/caolan/async#sortBy
cb(null, ts);
});
}, callback);
}
function listSortedMarkdown(dir, callback) {
// Async is just great!
// https://github.com/caolan/async#waterfall
async.waterfall([
async.apply(listFiles, dir, '.md'),
sortMarkdown,
], callback);
}
listSortedMarkdown(__dirname + '/blogs', function(err, sorted) {
return err ? console.error('Error: %s', err)
: console.dir(sorted);
});