# Creating Your First Command

Writing commands in C for Pumpkin is low-overhead, fast, and uses C WIT bindings.

---

## 1. Quick Example

Here is a complete C plugin file (`main.c`) that registers a `/hello` command with permission checks and sends a response back to the player.

```c [main.c]
#include <stdio.h>
#include "pumpkin.h"

void plugin_on_load(pumpkin_context_t ctx) {
    // 1. Register permission node
    pumpkin_permission_t perm = {
        .node = "my_c_plugin:hello",
        .description = "Allows executing the /hello command",
        .default_access = PERMISSION_DEFAULT_ALLOW
    };
    pumpkin_register_permission(ctx, &perm);

    // 2. Build and register command tree
    const char* names[] = {"hello", "hi"};
    pumpkin_command_t cmd = pumpkin_command_new(names, 2, "Greets the player");
    
    pumpkin_register_command(ctx, cmd, "my_c_plugin:hello");
}

int32_t plugin_handle_command(uint32_t command_id, pumpkin_sender_t sender, pumpkin_server_t server) {
    pumpkin_sender_send_message(sender, "Hello from C Plugin!");
    return 1;
}

pumpkin_metadata_t plugin_get_metadata() {
    pumpkin_metadata_t meta = {
        .name = "my_c_plugin",
        .version = "0.1.0",
        .description = "My first Pumpkin C plugin"
    };
    return meta;
}
```

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## 2. In-Game Preview

Once registered, your command automatically gains client-side autocompletion, syntax validation, and color highlighting in Minecraft:

<img src="/assets/first_command_preview.png" alt="In-Game Command Autocompletion Preview" width="500"/>

---

## 3. How It Works

::: details Step-by-Step Breakdown

### Step 1: Define the Permission Struct
Populate a `pumpkin_permission_t` struct and call `pumpkin_register_permission`:
```c
pumpkin_permission_t perm = {
    .node = "my_c_plugin:hello",
    .description = "Allows executing the /hello command",
    .default_access = PERMISSION_DEFAULT_ALLOW
};
pumpkin_register_permission(ctx, &perm);
```

### Step 2: Build the Command Tree
Create the command tree by passing name array and description:
```c
const char* names[] = {"hello", "hi"};
pumpkin_command_t cmd = pumpkin_command_new(names, 2, "Greets the player");
```

### Step 3: Register Command & Handle Execution
Pass the command handle to `pumpkin_register_command` and handle responses inside `plugin_handle_command`:
```c
pumpkin_register_command(ctx, cmd, "my_c_plugin:hello");
```

:::

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## Next Steps

- Check out the [C Quick Start Guide](./quick-start) to set up your compiler toolchain.