file walker now read title and thumbnail infos

src/file_walker.js

@@ -1,6 +1,6 @@
 const fs = require('fs');
 
-const fileTree = (path, cb) => {
+const getFileTree = (path, cb) => {
     let list = [];
     let remaining = 0;
     fs.readdir(path, {withFileTypes: true}, (err, items) => {
@@ -9,7 +9,7 @@ const fileTree = (path, cb) => {
         items.forEach((item) => {
             if (item.isDirectory()) {
                 remaining++;
-                fileTree(`${path}/${item.name}`, (err, out) => {
+                getFileTree(`${path}/${item.name}`, (err, out) => {
                     if (err)
                         return cb(err);
                     list.push(...out);
@@ -26,16 +26,30 @@ const fileTree = (path, cb) => {
     });
 };
 
-const readIndexFile = (path,cb) => {
-    //TODO reading page title and possibly ![thumbnail](url)
+const readIndexFile = (path, thumbnailTag, cb) => {
+    fs.readFile(path, {encoding: 'UTF-8'}, (err, data) => {
+        if (err)
+            return cb(err);
+
+        let info = {};
+
+        const regRes1 = data.match(/(^|[^#])#([^#\r\n]*)\r?\n?$/m);
+        info.title = regRes1 ? regRes1[2].trim() : undefined;
+
+        const thumbnailRegEx = new RegExp(`!\\[${thumbnailTag}]\\(([^)]*)\\)`, 'i');
+        const regRes2 = data.match(thumbnailRegEx);
+        info.thumbnail = regRes2 ? regRes2[1].trim() : undefined;
+
+        cb(null, info);
+    });
 };
 
 module.exports = (config) => {
     return {
-        fileTree: config['test'] ? fileTree : undefined,
+        fileTree: config['test'] ? getFileTree : undefined,
         readIndexFile: config['test'] ? readIndexFile : undefined,
         fetchArticles: (cb) => {
-            fileTree(config['data_dir'], (err, fileList) => {
+            getFileTree(config['data_dir'], (err, fileList) => {
                 if (err)
                     return cb(err);
                 const paths = fileList
@@ -44,16 +58,30 @@ module.exports = (config) => {
                     .map(path => path.substr(0, path.length - config['article']['index'].length))
                     .map(path => path.match(/^\/(\d{4})\/(\d{2})\/(\d{2})\/$/))
                     .filter(path => path && path.length > 1);
+                if (paths.length === 0)
+                    cb(null, []);
                 const list = [];
+                let remaining = 0;
                 paths.forEach(path => {
-                    list.push({
+                    const article = {
                         path: config['data_dir'] + path[0] + config['article']['index'],
                         year: parseInt(path[1]),
                         month: parseInt(path[2]),
                         day: parseInt(path[3])
+                    };
+                    remaining++;
+                    readIndexFile(article.path, config['article']['thumbnail_tag'], (err, info) => {
+                        if (err)
+                            return cb(err);
+                        article.title = info.title || config['article']['default_title'];
+                        article.thumbnail = info.thumbnail ? (config['data_dir'] + path[0] + info.thumbnail) : config['article']['default_thumbnail'];
+                        list.push(article);
+                        remaining--;
+                        if (remaining === 0)
+                            cb(null, list);
                     });
                 });
-                cb(null, list);
+
             });
         }
     };