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name: patterns/command description: Command Pattern pattern for C development

Command Pattern

Encapsulate a request as an object, allowing parameterization, queuing, and undo. In C, a struct containing function pointer plus arguments.

ikigai Application

Slash commands: Each command (/clear, /mark, /rewind) is a discrete operation:

Copytypedef struct {
    const char *name;
    res_t (*execute)(ik_repl_ctx_t *repl, const char *args);
    const char *help;
} ik_command_t;

Input actions: Parser emits action structs that REPL executes.

Future uses:

• Undo/redo stack for input editing
• Queued tool executions
• Macro recording and playback

Benefit: Commands become first-class, can be logged, serialized, or replayed.