Rename database client files to put them in a `Client` module

Will be modifying the class names in the next commit. Here we change the
file names & locations of the database client files.

The format changes thusly:

    <adapter>_client.rb -> client/<adapter>.rb

This organisation feels cleaner to me. Wasn't liking the previous
structure.

3 files changed, 62 insertions, 0 deletions

diff --git a/lib/dbshell/client/database.rb b/lib/dbshell/client/database.rb
new file mode 100644
index 0000000..edea777
--- /dev/null
+++ b/lib/dbshell/client/database.rb
@@ -0,0 +1,24 @@
+require 'dbshell/sqlite3_client'
+require 'dbshell/postgres_client'
+
+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
+
+  def self.runshell(connection_params)
+    self
+      .handler(connection_params)
+      .runshell(connection_params)
+  end
+end
+
+
+class DBShell::InvalidDatabaseAdapter < StandardError; end
diff --git a/lib/dbshell/client/postgres.rb b/lib/dbshell/client/postgres.rb
new file mode 100644
index 0000000..1c1c663
--- /dev/null
+++ b/lib/dbshell/client/postgres.rb
@@ -0,0 +1,23 @@
+class DBShell::PostgresClient
+  EXECUTABLE_NAME = 'psql'
+
+  def self.runshell(db_info)
+    args = self.build_command(db_info)
+    exec(*args)
+  end
+
+  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']
+
+    args.push('-U', user) if user
+    args.push('-h', host) if host
+    args.push('-p', port) if port
+    args.push(db_name)
+  end
+end
diff --git a/lib/dbshell/client/sqlite3.rb b/lib/dbshell/client/sqlite3.rb
new file mode 100644
index 0000000..adc71ef
--- /dev/null
+++ b/lib/dbshell/client/sqlite3.rb
@@ -0,0 +1,15 @@
+class DBShell::Sqlite3Client
+  EXECUTABLE_NAME = 'sqlite3'
+
+  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']
+    ]
+  end
+end