Adding old content "Discourse Rake Posts Snippets from BBCode to Markdown"

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content/blog/discourse-rake-posts-snippets-from-bbcode-to-markdown/index.md

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+---
+title: "Discourse Rake Posts Snippets from BBCode to Markdown"
+description: "After migrated devilzc0de from MyBB to Discourse, many things needs to be done. One of them is to rake and rebake the BBCode tags posts to Markdown."
+date: 2020-06-14T12:55:12+07:00
+lastmod:
+draft: false
+noindex: false
+featured: false
+pinned: false
+# comments: false
+series:
+#  - 
+categories:
+  - SysAdmin
+tags:
+  - Discourse
+  - Devilzc0de
+  - Ruby
+  - MyBB
+  - PostgreSQL
+images:
+#  - 
+# menu:
+#   main:
+#     weight: 100
+#     params:
+#       icon:
+#         vendor: bs
+#         name: book
+#         color: '#e24d0e'
+authors:
+  - ditatompel
+---
+
+It's been more than 1 year since I [migrated devilzc0de from MyBB to Discourse]({{< ref "/blog/story-behind-the-all-new-devilzc0de-migration-process/index.md" >}}) and many things needs to be done after the migration process is complete. One of them is to `rake` (and `rebake`, if needed) the **BBCode** tags to **Markdown** for each posts.
+
+<!--more-->
+
+Before you start you need to:
+- Backup your forum before perform any actions because you may break every single posts content and PMs.
+- Prepare your time and resource, especially if your forum had lots of posts.
+- Know that Discourse use PostgreSQL  database which use [POSIX regex](https://www.postgresql.org/docs/9.3/functions-matching.html#FUNCTIONS-POSIX-REGEXP) to perform regex matching and it will be case-sensitive.
+- Know that you can use BBCode plugin for Discourse like [discourse-bbcode](https://meta.discourse.org/t/discourse-bbcode/65425) without perform any of these actions.
+
+If you understand the risks (and you have another option) and still want to continue without additional plugins like I do, then go ahead. You need to enter your Discourse app by executing `./launcher enter app` from your root Discourse directory.
+
+## Remove Color, Size, Align, and Font Tags
+Color, size, font and align tags may different in each post, like `[color=#ff3333]` or `[color=red]`, `[font=‘Open Sans’, sans-serif]`, `[align=center]`, etc. These rake post command will remove any general BBCode color, size, font, and align tags.
+
+![Discourse Rake](dc-rake.png#center)
+
+![Discourse Replace BBCode to Markdown](feature-dc-rake-01.png#center)
+
+### BBCode Color Tags
+```ruby
+rake posts:delete_word['\\[color.*?\\]|\\[\\/color\\]',regex]
+```
+
+### BBCode Size Tags
+```ruby
+rake posts:delete_word['\\[size.*?\\]|\\[\\/size\\]',regex]
+```
+### BBCode Align Tags
+```ruby
+rake posts:delete_word['\\[align.*?\\]|\\[\\/align\\]',regex]
+```
+
+### BBCode Font Tags
+```ruby
+rake posts:delete_word['\\[font.*?\\]|\\[\\/font\\]',regex]
+```
+
+### All of Them Together
+```ruby
+rake posts:delete_word['\\[color.*?\\]|\\[\\/color\\]|\\[size.*?\\]|\\[\\/size\\]|\\[align.*?\\]|\\[\\/align\\]|\\[font.*?\\]|\\[\\/font\\]',regex]
+```
+
+> _**Note**: The regex is **case-sensitive**, tags with **uppercase** will not be removed. You need to check posts again by your self._
+
+## Replace String or Words (Remap)
+You can use `rake post:remap` to perform simple replacement. For example, oldest devilzc0de forum post is from 2010 where at that time, we rarely found sites using https.
+
+But now, https is everywhere and browser won't display mixed content. So, to replace `http://` to `https://` for each posts :
+```ruby
+rake posts:remap["http://","https://"]
+```
+
+This works for tagging user tags and emoji too.
+
+> _**Note**: You may increase `sidekiq` workers by updating Discourse `app.yml` `UNICORN_SIDEKIQS` **env** to spin up sidekiq queue for onebox and remote image fetch after remapping http to https._
+
+Unfortunately, rake remap doesn't work for `[code]`, `[spoiler]`, `[php]`, and `[qoute]` tags. Here is the example :
+
+In old MyBB forum, user using `[code]` block following with the actual codes without new line will work. But, markdown code tags works if you use new line after <code>```</code> block.
+
+```plain
+[code]var promise = new Promise(function(resolve, reject) {
+  // do a thing, possibly async, then…
+
+  if (/* everything is fine */) {
+    resolve("Worked!");
+  }
+  else {
+    reject(Error("Didn't work"));
+  }
+});
+[/code]
+```
+
+`[code]` tags above will work on **MyBB** and produce:
+
+```javascript
+var promise = new Promise(function(resolve, reject) {
+  // do a thing, possibly async, then…
+
+  if (/* everything is fine */) {
+    resolve("Worked!");
+  }
+  else {
+    reject(Error("Didn't work"));
+  }
+});
+```
+
+But on Discourse which use **Markdown**, if I replace `[code]` tags with <code>```</code> will produce :
+<pre>```var promise = new Promise(function(resolve, reject) {
+  // do a thing, possibly async, then…
+
+  if (/* everything is fine */) {
+    resolve("Worked!");
+  }
+  else {
+    reject(Error("Didn't work"));
+  }
+});
+```
+</pre>
+
+Code above **will not recognised as code block**. We need to add **new line** after first opening <code>\```</code> block. Unfortunately (at least for me), using <code>rake posts:remap["[code]","```\n"]</code> doesn't work and only produce the **"\n"** as plain text. The only working solution for me is **directly update raw PG database**.
+
+## PostgreSQL Raw Update
+You need to enter **PostgreSQL** on your Discourse app to run all PG query below. If you don't know how to do it, run `su -c 'psql discourse' postgres` after `./launcher enter app` command.
+
+> _**Note**: You need to `rebake` your post after update PostgreSQL post DB. To avoid rebake all your posts, you can use `rebake_match`. See example below._
+
+### Replace Spoiler Tags With Details Tags
+```sql
+UPDATE posts set raw=replace(raw, '[spoiler]', '[details=Spoiler]'||chr(10)) where raw like '%[spoiler]%';
+UPDATE posts set raw=replace(raw, '[spoiler=', '[details=') where raw like '%[spoiler=%';
+UPDATE posts set raw=replace(raw, '[/spoiler]', chr(10)||'[/details]') where raw like '%[/spoiler]%';
+```
+
+After updating database, exit from postgres user and run rebake post.
+```ruby
+rake posts:rebake_match["\[details"]
+```
+
+### Replace MyBB [php] Tags With Markdown PHP Syntax Highlight
+```sql
+UPDATE posts set raw=replace(raw, '[php]', '```php'||chr(10)) where raw like '%[php]%';
+UPDATE posts set raw=replace(raw, '[/php]', chr(10)||'```') where raw like '%[/php]%';
+```
+
+After updating database, exit from postgres user and run rebake post.
+
+```ruby
+rake posts:rebake_match["\`\`\`php"]
+```
+
+### Replace [code] tags With Markdown Tags
+```sql
+UPDATE posts set raw=replace(raw, '[code]', '```'||chr(10)) where raw like '%[code]%';
+UPDATE posts set raw=replace(raw, '[/code]', chr(10)||'```') where raw like '%[/code]%';
+```
+
+After updating database, exit from postgres user and run rebake post.
+
+```ruby
+rake posts:rebake_match["\`\`\`"]
+```
+
+## ToDo's
+- `[ul]`, `[ol]` and `[li]` tags replace to Markdown list tags
+- `[quote]` Tags to Markdown quote tags
+
+Please share if you have done mass replace for those two to do lists above.
+
+## Credits
+- [Cameron:D](https://meta.discourse.org/t/replace-a-string-in-all-posts/48729/70?u=ditatompel) and [Coin-coin le Canapin](https://meta.discourse.org/t/replace-a-string-in-all-posts/48729/72?u=ditatompel) post.