Add metadata writing functionality

[rbdr/blog] / lib / blog.js

diff --git a/lib/blog.js b/lib/blog.js
index 9024a00b95ce825ed5e0244bc322a9fe1762ec36..6b3397fd7d2f008ac1de39cb4552583fd0723124 100644 (file)
--- a/lib/blog.js
+++ b/lib/blog.js
@@ -22,7 +22,7 @@ const internals = {
   kIndexName: 'index.html',
   kFileNotFoundError: 'ENOENT',
   kMarkdownRe: /\.md$/i,
-  kRemoveCommand: 'rm -rf',
+  kMetadataFilename: 'metadata.json',
 
   // Strings
 
@@ -59,6 +59,7 @@ module.exports = class Blog {
    */
   async add(postLocation) {
 
+    await this._ensurePostsDirectoryExists();
     await this._shift();
     await this.update(postLocation);
   }
@@ -75,7 +76,11 @@ module.exports = class Blog {
    */
   async update(postLocation) {
 
+    const metadata = await this._getMetadata();
+    await this._ensurePostsDirectoryExists();
     await this._copyPost(postLocation);
+    await this._writeMetadata(metadata);
+
     await this._generate();
   }
 
@@ -148,18 +153,17 @@ module.exports = class Blog {
 
   async _shift() {
 
-    await this._ensurePostsDirectoryExists();
 
-    for (let i = this.maxPosts - 1; i > 0; --i) {
+    for (let i = this.maxPosts - 1; i >= 0; --i) {
       const targetPath = join(this.postsDirectory, `${i}`);
       const sourcePath = join(this.postsDirectory, `${i - 1}`);
 
       try {
-        await access(sourcePath);
-
         internals.debuglog(`Removing ${targetPath}`);
         await rmdir(targetPath, { recursive: true });
 
+        await access(sourcePath); // check the source path
+
         internals.debuglog(`Shifting blog post ${sourcePath} to ${targetPath}`);
         await internals.ncp(sourcePath, targetPath);
       }
@@ -174,12 +178,42 @@ module.exports = class Blog {
     }
   }
 
+  // Attempts to read existing metadata. Otherwise generates new set.
+
+  async _getMetadata() {
+
+    const metadataTarget = join(this.postsDirectory, '0', internals.kMetadataFilename);
+
+    try {
+      internals.debuglog(`Looking for metadata at ${metadataTarget}`);
+      return await readFile(metadataTarget);
+    }
+    catch (e) {
+      internals.debuglog(`Metadata not found or unreadable. Generating new set.`);
+      const createdOn = Date.now();
+      const metadata = {
+        id: String(createdOn),
+        createdOn
+      };
+
+      return JSON.stringify(metadata, null, 2);
+    }
+  }
+
+  // Writes metadata. Assumes post 0 since it only gets written
+  // on create
+
+  async _writeMetadata(metadata) {
+
+    const metadataTarget = join(this.postsDirectory, '0', internals.kMetadataFilename);
+    internals.debuglog(`Writing ${metadataTarget}`);
+    await writeFile(metadataTarget, metadata);
+  }
+
   // Copies a post directory to the latest slot.
 
   async _copyPost(postLocation) {
 
-    await this._ensurePostsDirectoryExists();
-
     const targetPath = join(this.postsDirectory, '0');
 
     internals.debuglog(`Removing ${targetPath}`);