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# Contributing to mattata
## Plugin Development
### Plugin Contract
Every plugin must export a table with these fields:
```lua
local plugin = {}
plugin.name = 'mycommand' -- Unique identifier
plugin.category = 'utility' -- admin, utility, fun, media, ai
plugin.description = 'Short desc' -- For help text
plugin.commands = { 'cmd', 'alias' } -- Without / prefix
plugin.help = '/cmd [args] - Usage.' -- Full usage text
-- Optional flags
plugin.group_only = false -- Restrict to groups
plugin.admin_only = false -- Require group admin
plugin.global_admin_only = false -- Require bot owner
plugin.permanent = false -- Cannot be disabled
```
### Handler Functions
```lua
-- Command handler (when /cmd matches)
function plugin.on_message(api, message, ctx) end
-- Callback query handler (buttons with data "pluginname:data")
function plugin.on_callback_query(api, callback_query, message, ctx) end
-- Passive handler (runs on every message, no command needed)
function plugin.on_new_message(api, message, ctx) end
-- New member handler
function plugin.on_member_join(api, message, ctx) end
-- Inline query handler
function plugin.on_inline_query(api, inline_query, ctx) end
-- Cron job (runs every minute)
function plugin.cron(api, ctx) end
```
### Context Object (`ctx`)
| Field | Type | Description |
|-------|------|-------------|
| `ctx.api` | table | Telegram Bot API |
| `ctx.db` | table | PostgreSQL (query, execute, insert, upsert) |
| `ctx.redis` | table | Redis client proxy |
| `ctx.session` | table | Session/cache manager |
| `ctx.config` | table | Configuration reader |
| `ctx.i18n` | table | Language manager |
| `ctx.permissions` | table | Permission checks |
| `ctx.lang` | table | Current language strings |
| `ctx.is_group` | bool | Is group chat |
| `ctx.is_admin` | bool | Is user group admin |
| `ctx.is_global_admin` | bool | Is user bot owner |
### Adding a Plugin
1. Create your plugin in the appropriate category directory
2. Add the plugin name to the category's `src/plugins/<category>/init.lua`
3. Test with `/reload` (admin only)
### Database Migrations
If your plugin needs database tables, add a migration file to `src/db/migrations/`:
```lua
local migration = {}
function migration.up()
return [[
CREATE TABLE IF NOT EXISTS my_table (
id SERIAL PRIMARY KEY,
...
)
]]
end
return migration
```
### Code Style
- Use 4 spaces for indentation
- Local variables in `snake_case`
- Module tables as `local plugin = {}`
- Always return the plugin table
- Wrap API calls that might fail in `pcall`
- Use `require('telegram-bot-lua.tools').escape_html()` for user input in HTML messages
## Language Translations
Language files are in `src/languages/`. To add a new language:
1. Copy `en_gb.lua` as a template
2. Translate all string values
3. Add the language code to `src/languages/init.lua`

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