[9.x] Added whenTableHasColumn and whenTableHasNotColumn on Schema Builder

Author: eusonlito

src/Illuminate/Database/Schema/Builder.php

@@ -170,6 +170,36 @@ public function hasColumns($table, array $columns)
         return true;
     }
 
+    /**
+     * Execute a callback inside table builder if has a column
+     *
+     * @param  string  $table
+     * @param  string  $column
+     * @param  \Closure  $callback
+     * @return void
+     */
+    public function whenTableHasColumn(string $table, string $column, Closure $callback): void
+    {
+        if ($this->hasColumn($table, $column)) {
+            $this->table($table, fn (Blueprint $table) => $callback($table));
+        }
+    }
+
+    /**
+     * Execute a callback inside table builder if does't have a column
+     *
+     * @param  string  $table
+     * @param  string  $column
+     * @param  \Closure  $callback
+     * @return void
+     */
+    public function whenTableHasNotColumn(string $table, string $column, Closure $callback): void
+    {
+        if (! $this->hasColumn($table, $column)) {
+            $this->table($table, fn (Blueprint $table) => $callback($table));
+        }
+    }
+
     /**
      * Get the data type for the given column name.
      *