Add sqlite schema dump support

Author: paras-malhotra

src/Illuminate/Database/Console/Migrations/MigrateCommand.php

@@ -127,8 +127,7 @@ protected function loadSchemaState()
         // First, we will make sure that the connection supports schema loading and that
         // the schema file exists before we proceed any further. If not, we will just
         // continue with the standard migration operation as normal without errors.
-        if ($connection instanceof SQLiteConnection ||
-            $connection instanceof SqlServerConnection ||
+        if ($connection instanceof SqlServerConnection ||
             ! is_file($path = $this->schemaPath($connection))) {
             return;
         }

src/Illuminate/Database/SQLiteConnection.php

@@ -7,6 +7,7 @@
 use Illuminate\Database\Query\Processors\SQLiteProcessor;
 use Illuminate\Database\Schema\Grammars\SQLiteGrammar as SchemaGrammar;
 use Illuminate\Database\Schema\SQLiteBuilder;
+use Illuminate\Database\Schema\SqliteSchemaState;
 use Illuminate\Filesystem\Filesystem;
 use RuntimeException;
 
@@ -80,7 +81,7 @@ protected function getDefaultSchemaGrammar()
      */
     public function getSchemaState(Filesystem $files = null, callable $processFactory = null)
     {
-        throw new RuntimeException('Schema dumping is not supported when using SQLite.');
+        return new SqliteSchemaState($this, $files, $processFactory);
     }
 
     /**

src/Illuminate/Database/Schema/SqliteSchemaState.php

@@ -0,0 +1,94 @@
+<?php
+
+namespace Illuminate\Database\Schema;
+
+use Exception;
+use Illuminate\Support\Str;
+use Symfony\Component\Process\Process;
+
+class SqliteSchemaState extends SchemaState
+{
+    /**
+     * Dump the database's schema into a file.
+     *
+     * @param string $path
+     *
+     * @return void
+     */
+    public function dump($path)
+    {
+        with($process = $this->makeProcess(
+            $this->baseCommand().' .schema'
+        ))->mustRun(null, array_merge($this->baseVariables($this->connection->getConfig()), [
+            //
+        ]));
+
+        $migrations = collect(preg_split("/\r\n|\n|\r/", $process->getOutput()))->filter(function ($line) {
+            return stripos($line, 'sqlite_sequence') === false &&
+                   strlen($line) > 0;
+        })->all();
+
+        $this->files->put($path, implode(PHP_EOL, $migrations).PHP_EOL);
+
+        $this->appendMigrationData($path);
+    }
+
+    /**
+     * Append the migration data to the schema dump.
+     *
+     * @return void
+     */
+    protected function appendMigrationData(string $path)
+    {
+        with($process = $this->makeProcess(
+            $this->baseCommand().' ".dump \'migrations\'"'
+        ))->mustRun(null, array_merge($this->baseVariables($this->connection->getConfig()), [
+            //
+        ]));
+
+        $migrations = collect(preg_split("/\r\n|\n|\r/", $process->getOutput()))->filter(function ($line) {
+            return preg_match('/^\s*(--|INSERT\s)/iu', $line) === 1 &&
+                   strlen($line) > 0;
+        })->all();
+
+        $this->files->append($path, implode(PHP_EOL, $migrations).PHP_EOL);
+    }
+
+    /**
+     * Load the given schema file into the database.
+     *
+     * @param string $path
+     *
+     * @return void
+     */
+    public function load($path)
+    {
+        $process = $this->makeProcess($this->baseCommand().' < $LARAVEL_LOAD_PATH');
+
+        $process->mustRun(null, array_merge($this->baseVariables($this->connection->getConfig()), [
+            'LARAVEL_LOAD_PATH' => $path,
+        ]));
+    }
+
+    /**
+     * Get the base sqlite command arguments as a string.
+     *
+     * @return string
+     */
+    protected function baseCommand()
+    {
+        return 'sqlite3 $LARAVEL_LOAD_DATABASE';
+    }
+
+    /**
+     * Get the base variables for a dump / load command.
+     *
+     * @return array
+     */
+    protected function baseVariables(array $config)
+    {
+        return [
+            'LARAVEL_LOAD_DATABASE' => $config['database'],
+        ];
+    }
+}