Rename database client classes

Update our class names to reflect the new file structure introduced in
b700c1bef89a67a64f1040fb6bb03c0320eefe91.

Use the

    module DBShell
      module Client
      end
    end

syntax intead of `DBShell::Client` so that we don't have to define the
`Client` module in a separate file and require it. Otherwise we'd get an
error:

    lib/dbshell/client/sqlite3.rb:1:in `<top (required)>': uninitialized constant DBShell::Client (NameError)

4 files changed, 56 insertions, 44 deletions

diff --git a/lib/dbshell/client/database.rb b/lib/dbshell/client/database.rb
index d77efce..35cb9ee 100644
--- a/lib/dbshell/client/database.rb
+++ b/lib/dbshell/client/database.rb
@@ -1,22 +1,26 @@
 require 'dbshell/client/sqlite3'
 require 'dbshell/client/postgres'
 
-class DBShell::DatabaseClient
-  def self.handler(connection_params)
-    case connection_params['adapter']
-    when 'sqlite3'
-      DBShell::Sqlite3Client
-    when 'postgresql'
-      DBShell::PostgresClient
-    else
-      raise DBShell::InvalidDatabaseAdapter
-    end
-  end
+module DBShell
+  module Client
+    class Database
+      def self.handler(connection_params)
+        case connection_params['adapter']
+        when 'sqlite3'
+          DBShell::Client::Sqlite3
+        when 'postgresql'
+          DBShell::Client::Postgres
+        else
+          raise DBShell::InvalidDatabaseAdapter
+        end
+      end
 
-  def self.runshell(connection_params)
-    self
-      .handler(connection_params)
-      .runshell(connection_params)
+      def self.runshell(connection_params)
+        self
+          .handler(connection_params)
+          .runshell(connection_params)
+      end
+    end
   end
 end
 
diff --git a/lib/dbshell/client/postgres.rb b/lib/dbshell/client/postgres.rb
index 1c1c663..0e33843 100644
--- a/lib/dbshell/client/postgres.rb
+++ b/lib/dbshell/client/postgres.rb
@@ -1,23 +1,27 @@
-class DBShell::PostgresClient
-  EXECUTABLE_NAME = 'psql'
+module DBShell
+  module Client
+    class Postgres
+      EXECUTABLE_NAME = 'psql'
 
-  def self.runshell(db_info)
-    args = self.build_command(db_info)
-    exec(*args)
-  end
+      def self.runshell(db_info)
+        args = self.build_command(db_info)
+        exec(*args)
+      end
 
-  def self.build_command(db_info)
-    args = [EXECUTABLE_NAME]
+      def self.build_command(db_info)
+        args = [EXECUTABLE_NAME]
 
-    host = db_info['host']
-    port = db_info['port']
-    db_name = db_info['database']
-    user = db_info['username']
-    password = db_info['password']
+        host = db_info['host']
+        port = db_info['port']
+        db_name = db_info['database']
+        user = db_info['username']
+        password = db_info['password']
 
-    args.push('-U', user) if user
-    args.push('-h', host) if host
-    args.push('-p', port) if port
-    args.push(db_name)
+        args.push('-U', user) if user
+        args.push('-h', host) if host
+        args.push('-p', port) if port
+        args.push(db_name)
+      end
+    end
   end
 end
diff --git a/lib/dbshell/client/sqlite3.rb b/lib/dbshell/client/sqlite3.rb
index adc71ef..09b44f9 100644
--- a/lib/dbshell/client/sqlite3.rb
+++ b/lib/dbshell/client/sqlite3.rb
@@ -1,15 +1,19 @@
-class DBShell::Sqlite3Client
-  EXECUTABLE_NAME = 'sqlite3'
+module DBShell
+  module Client
+    class Sqlite3
+      EXECUTABLE_NAME = 'sqlite3'
 
-  def self.runshell(db_info)
-    args = self.build_command(db_info)
-    exec(*args)
-  end
+      def self.runshell(db_info)
+        args = self.build_command(db_info)
+        exec(*args)
+      end
 
-  def self.build_command(db_info)
-    args = [
-      EXECUTABLE_NAME,
-      db_info['database']
-    ]
+      def self.build_command(db_info)
+        args = [
+          EXECUTABLE_NAME,
+          db_info['database']
+        ]
+      end
+    end
   end
 end
diff --git a/lib/dbshell/rails/tasks/dbshell.rake b/lib/dbshell/rails/tasks/dbshell.rake
index c7d3a93..cc898a4 100644
--- a/lib/dbshell/rails/tasks/dbshell.rake
+++ b/lib/dbshell/rails/tasks/dbshell.rake
@@ -3,7 +3,7 @@ require 'dbshell/client/database'
 task :dbshell do
   env = ENV.fetch('RAILS_ENV', 'development')
 
-  DBShell::DatabaseClient.runshell(
+  DBShell::Client::Database.runshell(
     Rails.application.config.database_configuration[env]
   )
 end