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Show first post plugin for MyBB 1.8.x
This plugin shows first post on each thread page.

This is modification of plugin Show First Post [1.4] created by Jasiu & krig. Since authors of this plugin is not active anymore and plugin have no any license, I made a little modification for compability with 1.8.x, and post it to the public.

Warning: I'm not a PHP developer and my madskillz in PHP are poor. But I'll try to learn quickly as I can.
Sorry for grammar and other mistakes, English is not my native language.

# Changes compare to original plugin:
- fixed template insert incompabilty with MyBB 1.8.x
- fixed template look and feel to match default MyBB 1.8.x view
- fixed general incompabilty with MyBB 1.8.x
- moderator options (pin/unpin) are working now

# Known issues:
- pinned post always have PID of the last post in thread
- redirect message have no language strings
- incorrect settings state after disable/enable plugin (always show default settings state)

# TODO
- uninstallation feature with correct deletion of all plugin settings from DB
- proper language support (for now, plugin uses single lang file and insert ACP settings / redirect messages strings direct in template) for ACP, redirect message
- query optimization?

# Download:
Version 1.4.5 in attachment.

My main questions are:
- how to implement correct language support, with separate ACP and general lang files?
- how to implement correct uninstallation process?
- what about license? I want this plugin to be available for all without any limitations.

I'll be appreciate any help in development!

Hi, thanx for your work on the plugin!

With PHP 7.2 there is a warning when global_first_post template is evaluated:

<error>
 <dateline>1531610597</dateline>
 <script>inc/plugins/show_first_post.php(147) : eval()'d code</script>
 <line>2</line>
 <type>2</type>
 <friendly_type>Warning</friendly_type>
 <message>Use of undefined constant borderwidth - assumed 'borderwidth' (this will throw an Error in a future version of PHP)</message>
</error>

<error>
 <dateline>1531610597</dateline>
 <script>inc/plugins/show_first_post.php(147) : eval()'d code</script>
 <line>2</line>
 <type>2</type>
 <friendly_type>Warning</friendly_type>
 <message>Use of undefined constant tablespace - assumed 'tablespace' (this will throw an Error in a future version of PHP)</message>
</error>

<error>
 <dateline>1531610597</dateline>
 <script>inc/plugins/show_first_post.php(147) : eval()'d code</script>
 <line>5</line>
 <type>2</type>
 <friendly_type>Warning</friendly_type>
 <message>Use of undefined constant threadprefix - assumed 'threadprefix' (this will throw an Error in a future version of PHP)</message>
</error>

<error>
 <dateline>1531610597</dateline>
 <script>inc/plugins/show_first_post.php(147) : eval()'d code</script>
 <line>5</line>
 <type>2</type>
 <friendly_type>Warning</friendly_type>
 <message>Use of undefined constant subject - assumed 'subject' (this will throw an Error in a future version of PHP)</message>
</error>

The problem is that in the template:

$theme[borderwidth]

should correctly be:

$theme['borderwidth']

To fix this, in the plugin file I changed the $fp_template array like this:

$template_text = "<table border=\"0\" cellspacing=\"{\$theme['borderwidth']}\" cellpadding=\"{\$theme['tablespace']}\" class=\"tborder tfixed clear\">
 <tr>
 <td class=\"thead\">
 <div><strong>{\$lang->first_post} - {\$thread['threadprefix']}{\$thread['subject']}</strong></div>
 </td>
 </tr>
 <tr>
 <td id=\"posts_container\">
 <div id=\"posts\">
 {\$posts}
 </div>
 </td>
 </tr>
 </table>
 <br />";

 $fp_template = array (
 "title" => "global_first_post",
 "template" => $db->escape_string($template_text),
 "sid" => -1,
 "version" => 122,
 "status" => "",
 "dateline" => time(),);

Here is also some code to handle complete Uninstall:

function show_first_post_uninstall()
{
	global $mybb, $db;
	
	if($mybb->request_method != 'post')
	{
		global $page, $lang;
		
		//TODO: add inc/languages/english/admin/config_show_first_post.php
		//$lang->load('config_show_first_post');
		//$page->output_confirm_action('index.php?module=config-plugins&action=deactivate&uninstall=1&plugin=show_first_post', $lang->sfp_uninstall_message, $lang->sfp_uninstall);
		
		$page->output_confirm_action('index.php?module=config-plugins&action=deactivate&uninstall=1&plugin=show_first_post', "Each thread has a setting whether first post is pinned. Do you wish to remove all these settings?", "Uninstall First Post MOD");
	}
	
	if(!isset($mybb->input['no']))
	{
		if($db->field_exists('fix_first_post', 'threads'))
		{
			$db->query("ALTER TABLE ".TABLE_PREFIX."threads DROP column `fix_first_post`"); 
			//$db->query("ALTER TABLE ".TABLE_PREFIX."threads ADD `fix_first_post_test` TINYINT(1)");
		}
	}
}

function show_first_post_is_installed()
{
	global $db;	
	
	if($db->field_exists('fix_first_post', 'threads'))
	{
		return true;
	}
	return false;
}

You can consider adding the plugin here: https://community.mybb.com/mods.php

I created a project page for this plugin so that it is easier to find and maintain. If anyone would like to collaborate, please let me know.