Add whenTableHasIndex and whenTableDoesntHaveIndex to Builder

[jackbayliss]

I reached for these but only found the whenTableHasColumn ones

This PR adds whenTableHasIndex and whenTableDoesntHaveIndex to align with whenTableHasColumn.

Not sure if you're keen on these, but thought i'd give it a go to help dx

I don't see any tests for whenTableHasColumn - so have left these out for now. Let me know if you want some tests? I can have a go later on.

Before you'd have to use the Schema again:

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Migrations\Migration;

return new class extends Migration
{

    public function up(): void
    {
        if (! Schema::hasIndex('product', 'name')) {
            Schema::table('product', function (Blueprint $table) {
                $table->index('name', 'index_name');
            });
        }
    }
};

Now you can just do the below:

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Migrations\Migration;

return new class extends Migration
{
    public function up(): void
    {
        Schema::whenTableDoesntHaveIndex('product', 'name', function (Blueprint $table) {
            $table->index('name', 'index_name');
        });

        // You can also pass the index type...
        Schema::whenTableDoesntHaveIndex('product', 'name', function (Blueprint $table) {
            $table->index('name', 'index_name');
        },  'unique');
    }
};

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[taylorotwell]

Type should be the last arg imo.

[jackbayliss]

@taylorotwell Should be good now, thank you for your review 🫡