Conditional Commands

Implements three extension traits * ConditionalInsertComponentsExt for EntityCommands and EntityMut\ with methods: - insert_if - insert_if_else - insert_bundle_if - insert_bundle_if_else - insert_some - insert_bundle_some * ConditionalChildBuilderExt for EntityCommands\ with method: - with_children_if * ConditionalWorldChildBuilderExt for EntityMut\ with method: - with_children_if

that allow for conditional component, bundle, and child insertion without the need for an intermediate EntityCommands or EntityMut binding. * Supports Bevy 0.7 #

New for Version 0.3

• insert_some methods. If present, insert the inner value of an Option.

Version 0.2

• Implementated traits for EntityMut.

• *_if_else methods.

  ```rust use conditional_commands::*;

  [derive(Component)]

  struct Even;

  [derive(Component)]

  struct Odd;

  fn exclusivesystem(world: &mut World) { for n in 0..10 { world.spawn() .insertif_else(n % 2 == 0, Even, Odd); } } ```

#

Usage

Add to your Cargo.toml [Dependencies] section

conditional_commands = "0.2"

Then access with the use declaration

rust use conditional_commands::*; #

Motivating Contrived ECS Fizz-Buzz Example

```rust use bevy::prelude::*;

[derive(Component)]

struct Number(usize);

[derive(Component)]

struct Fizz;

[derive(Component)]

struct Buzz;

fn fizzbuzz( mut commands: Commands ) { for n in 1 ..= N { let mut entitycommands = commands.spawn(); if n % 3 { (0, 0) => { entitycommands.insertbundle((Fizz, Buzz)); }, (0, ) => { entitycommands.insert(Fizz); }, (, 0) => { entitycommands.insert(Buzz); }, _ => { entity_commands.insert(Number(n)); } } } } ``` With Conditional Commands we no longer need the intermediate EntityCommands binding.

```rust use conditional_commands::*;

fn fizzbuzz( mut commands: Commands ) { for n in 1 ..= N { commands .spawn() .insertif(0 < n % 3 && 0 < n % 5, Number(n)) .insertif(n % 3 == 0, Fizz) .insertif(n % 5 == 0, Buzz); } } ```