Add rudimentary sync support

3 files changed, 157 insertions, 23 deletions

diff --git a/lib/blog.js b/lib/blog.js
index 6b831f7..ba9ae53 100644
--- a/lib/blog.js
+++ b/lib/blog.js
@@ -1,8 +1,7 @@
 'use strict';
 
-const { access, mkdir, readdir, readFile, rm, writeFile } = require('fs/promises');
+const { access, cp, mkdir, readdir, readFile, rm, writeFile } = require('fs/promises');
 const { exec } = require('child_process');
-const { ncp } = require('ncp');
 const { basename, resolve, join } = require('path');
 const ParseGemini = require('gemini-to-html/parse');
 const RenderGemini = require('gemini-to-html/render');
@@ -19,11 +18,14 @@ const TXTGenerator = require('./generators/txt');
 
 const GemlogArchiver = require('./archivers/gemlog');
 
+// Remote Handler
+
+const Remote = require('./remote');
+
 const internals = {
 
   // Promisified functions
   exec: promisify(exec),
-  ncp: promisify(ncp),
 
   debuglog: debuglog('blog'),
 
@@ -69,6 +71,10 @@ module.exports = class Blog {
   async add(postLocation) {
 
     await this._ensurePostsDirectoryExists();
+    try {
+      await this.syncDown();
+    }
+    catch {};
     await this._shift();
     await this._ensurePostsDirectoryExists(join(this.postsDirectory, '0'));
     await this.update(postLocation);
@@ -86,6 +92,10 @@ module.exports = class Blog {
    */
   async update(postLocation) {
 
+    try {
+      await this.syncDown();
+    }
+    catch {};
     const metadata = await this._getMetadata();
     await this._ensurePostsDirectoryExists();
     await this._copyPost(postLocation);
@@ -94,6 +104,10 @@ module.exports = class Blog {
     await this._archive(postLocation);
 
     await this.generate();
+    try {
+      await this.syncUp();
+    }
+    catch {};
   }
 
   /**
@@ -158,6 +172,55 @@ module.exports = class Blog {
     internals.debuglog('Finished publishing');
   }
 
+  /**
+   * Adds a remote
+   *
+   * @function addRemote
+   * @memberof Blog
+   * @return {Promise<undefined>} empty promise, returns no value
+   * @instance
+   */
+  async addRemote(remote) {
+    await Remote.add(this.remoteConfig, remote)
+  }
+
+  /**
+   * Removes a remote
+   *
+   * @function removeRemote
+   * @memberof Blog
+   * @return {Promise<undefined>} empty promise, returns no value
+   * @instance
+   */
+  async removeRemote() {
+    await Remote.remove(this.remoteConfig)
+  }
+
+
+  /**
+   * Pulls the posts and archive from the remote
+   *
+   * @function syncDown
+   * @memberof Blog
+   * @return {Promise<undefined>} empty promise, returns no value
+   * @instance
+   */
+  async syncDown() {
+    await Remote.syncDown(this.remoteConfig, this.blogDirectory)
+  }
+
+  /**
+   * Pushes the posts and archive to the remote
+   *
+   * @function syncUp
+   * @memberof Blog
+   * @return {Promise<undefined>} empty promise, returns no value
+   * @instance
+   */
+  async syncUp() {
+    await Remote.syncUp(this.remoteConfig, this.blogDirectory)
+  }
+
   // Parses Gemini for each page, copies assets and generates index.
 
   async generate() {
@@ -238,7 +301,7 @@ module.exports = class Blog {
         await access(sourcePath); // check the source path
 
         internals.debuglog(`Shifting blog post ${sourcePath} to ${targetPath}`);
-        await internals.ncp(sourcePath, targetPath);
+        await cp(sourcePath, targetPath, { recursive: true });
       }
       catch (error) {
         if (error.code === internals.kFileNotFoundError) {
@@ -260,16 +323,12 @@ module.exports = class Blog {
 
     const targetPath = join(this.archiveDirectory, post.id);
 
-    try {
-      internals.debuglog(`Removing ${targetPath}`);
-      await rm(targetPath, { recursive: true });
-    } 
-    finally {
-      internals.debuglog(`Adding ${post.location} to ${targetPath}`);
-      await this._ensureDirectoryExists(targetPath);
-      await internals.ncp(post.location, targetPath);
-      internals.debuglog(`Added ${post.location} to ${targetPath}`);
-    }
+    internals.debuglog(`Removing ${targetPath}`);
+    await rm(targetPath, { recursive: true, force: true });
+    internals.debuglog(`Adding ${post.location} to ${targetPath}`);
+    await this._ensureDirectoryExists(targetPath);
+    await cp(post.location, targetPath, { recursive: true });
+    internals.debuglog(`Added ${post.location} to ${targetPath}`);
   }
 
   // Attempts to read existing metadata. Otherwise generates new set.
@@ -313,14 +372,11 @@ module.exports = class Blog {
     const targetPost = join(targetPath, postName);
 
     internals.debuglog(`Removing ${targetPath}`);
-    try {
-      await rm(targetPath, { recursive: true });
-    }
-    finally {
-      await this._ensureDirectoryExists(targetPath);
-      internals.debuglog(`Adding ${postLocation} to ${targetPost}`);
-      await internals.ncp(postLocation, targetPost);
-    }
+    await rm(targetPath, { recursive: true, force: true });
+    await this._ensureDirectoryExists(targetPath);
+    internals.debuglog(`Adding ${postLocation} to ${targetPost}`);
+    await cp(postLocation, targetPost, { recursive: true });
+    internals.debuglog(`Added ${postLocation} to ${targetPath}`);
   }
 
   // Ensures a directory exists.
@@ -334,7 +390,7 @@ module.exports = class Blog {
     catch (error) {
       if (error.code === internals.kFileNotFoundError) {
         internals.debuglog(`Creating ${directory}`);
-        await mkdir(directory);
+        await mkdir(directory, { recursive: true });
         return;
       }
 
diff --git a/lib/remote.js b/lib/remote.js
new file mode 100644
index 0000000..d8f73f9
--- /dev/null
+++ b/lib/remote.js
@@ -0,0 +1,48 @@
+const { readFile, rm, writeFile } = require('fs/promises');
+
+const internals = {
+  strings: {
+    configurationNotFound: 'Remote configuration not set, consult help for more info.'
+  },
+  strategies: [
+    require('./remotes/git')
+  ]
+};
+
+module.exports = {
+  async add(remoteConfig, remote) {
+    await writeFile(remoteConfig, remote);
+  },
+
+  async remove(remoteConfig) {
+    await rm(remoteConfig, { force: true })
+  },
+
+  async syncUp(remoteConfig, blogDirectory) {
+    this._executeMethodOnStrategy(remoteConfig, 'syncUp', blogDirectory);
+  },
+
+  async syncDown(remoteConfig, blogDirectory) {
+    this._executeMethodOnStrategy(remoteConfig, 'syncDown', blogDirectory);
+  },
+
+  async _executeMethodOnStrategy(remoteConfig, method, blogDirectory) {
+    const remote = await this._ensureConfiguration(remoteConfig);
+
+    for (const strategy of internals.strategies) {
+      if (strategy.canHandle(remote)) {
+        await strategy[method](remote, blogDirectory);
+      }
+    }
+  },
+
+  async _ensureConfiguration(remoteConfig) {
+    try {
+      const configuration = await readFile(remoteConfig, { encoding: 'utf8' });
+      return configuration;
+    }
+    catch {
+      throw new Error(internals.strings.configurationNotFound);
+    }
+  }
+}
diff --git a/lib/remotes/git.js b/lib/remotes/git.js
new file mode 100644
index 0000000..d8e0cfd
--- /dev/null
+++ b/lib/remotes/git.js
@@ -0,0 +1,30 @@
+const { exec } = require('child_process');
+const { debuglog, promisify } = require('util');
+
+const internals = {
+  // Promisified functions
+  exec: promisify(exec),
+
+  debuglog: debuglog('blog'),
+};
+
+module.exports = {
+  canHandle() {
+    // For the future: actually check if it's a valid git url
+    return true;
+  },
+
+  async syncUp(remote, blogDirectory) {
+    await internals.exec(`cd ${blogDirectory} && git init`);
+    await internals.exec(`cd ${blogDirectory} && git add .`);
+    await internals.exec(`cd ${blogDirectory} && git commit --allow-empty -m blog-sync-up-${Date.now()}`);
+    await internals.exec(`cd ${blogDirectory} && git push ${remote} main --force`);
+  },
+
+  async syncDown(remote, blogDirectory) {
+    await internals.exec(`cd ${blogDirectory} && git init`);
+    await internals.exec(`cd ${blogDirectory} && git checkout .`);
+    await internals.exec(`cd ${blogDirectory} && git clean . -f`);
+    await internals.exec(`cd ${blogDirectory} && git pull ${remote} main`);
+  }
+}