Dev pr

[shuv1337]

Greptile Summary

Added plugin command system that enables plugins to register custom slash commands accessible via /command in TUI/web.

Key changes:

• Commands now have a type field ("template" or "plugin") to distinguish between template-based and plugin-provided commands
• Plugin commands support aliases for alternate names, and sessionOnly flag to restrict commands to existing sessions
• The Command.get() function now resolves aliases by searching through all commands
• Plugin command execution happens directly via the plugin's execute function, with error handling and event publishing
• Command.Event.Executed is only emitted when a plugin command creates a new message (checked by comparing message IDs before/after execution)
• Added comprehensive test coverage for plugin commands including alias resolution, execution, error handling, and session-only guards

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The implementation is well-structured with proper error handling, comprehensive test coverage, and clear separation of concerns. The changes follow existing code patterns and include appropriate guards for edge cases.
• No files require special attention

Important Files Changed

Filename	Overview
packages/opencode/src/command/index.ts	Added plugin command support with type field, aliases, and sessionOnly flag - implementation looks clean
packages/opencode/src/session/prompt.ts	Added plugin command execution logic with sessionOnly guard and event emission only when message created
packages/plugin/src/index.ts	Added plugin.command hook interface definition with description, aliases, sessionOnly, and execute function

Sequence Diagram

sequenceDiagram
    participant User
    participant SessionPrompt
    participant Command
    participant Plugin
    participant PluginCommand
    participant Session
    participant Bus

    User->>SessionPrompt: command(input)
    SessionPrompt->>Command: get(input.command)
    Command->>Plugin: list()
    Plugin-->>Command: plugin hooks with plugin.command
    Command-->>SessionPrompt: command info (with type, aliases, sessionOnly)
    
    alt command not found
        SessionPrompt->>SessionPrompt: log warning & return
    end
    
    alt sessionOnly is true
        SessionPrompt->>Session: get(sessionID)
        alt session not found
            Session-->>SessionPrompt: throw error
            SessionPrompt->>Bus: publish(Session.Event.Error)
            SessionPrompt-->>User: throw error
        end
    end
    
    alt command.type === "plugin"
        SessionPrompt->>Session: messages(sessionID, limit=1)
        Session-->>SessionPrompt: messagesBefore
        SessionPrompt->>Plugin: client()
        Plugin-->>SessionPrompt: opencode client
        SessionPrompt->>PluginCommand: execute({sessionID, arguments, client})
        alt execution fails
            PluginCommand-->>SessionPrompt: throw error
            SessionPrompt->>Bus: publish(Session.Event.Error)
            SessionPrompt-->>User: throw error
        end
        PluginCommand-->>SessionPrompt: success
        SessionPrompt->>Session: messages(sessionID, limit=1)
        Session-->>SessionPrompt: messagesAfter
        alt new message created
            SessionPrompt->>Bus: publish(Command.Event.Executed)
            SessionPrompt-->>User: return new message
        else no new message
            SessionPrompt-->>User: return
        end
    else command.type === "template"
        SessionPrompt->>SessionPrompt: process template command
        SessionPrompt->>Bus: publish(Command.Event.Executed)
        SessionPrompt-->>User: return message
    end

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