Some dbconsole tweaks. [#102 state:resolved]

railties/lib/commands/dbconsole.rb

+require 'yaml'
 require 'optparse'
+
 OptionParser.new do |opt|
   opt.banner = "Usage: dbconsole [environment]"
   opt.parse!(ARGV)
   abort opt.to_s unless (0..1).include?(ARGV.size)
 end
 
-env = ENV['RAILS_ENV'] = ARGV.first || ENV['RAILS_ENV'] || 'development'
+env = ARGV.first || ENV['RAILS_ENV'] || 'development'
+unless config = YAML.load_file(RAILS_ROOT + "/config/database.yml")[env]
+  abort "No database is configured for the environment '#{env}'"
+end
+
 
 def find_cmd(*commands)
-  dirs_on_path = ENV['PATH'].split(File::PATH_SEPARATOR)
+  dirs_on_path = ENV['PATH'].to_s.split(File::PATH_SEPARATOR)
   commands += commands.map{|cmd| "#{cmd}.exe"} if RUBY_PLATFORM =~ /win32/
   commands.detect do |cmd|
     dirs_on_path.detect do |path|
       File.executable? File.join(path, cmd)
     end
-  end || abort("couldn't find matching executable: #{commands.join(', ')}")
+  end || abort("Couldn't find database client: #{commands.join(', ')}. Check your $PATH and try again.")
 end
 
+case config["adapter"]
+when "mysql"
+  args = {
+    'host'      => '--host',
+    'port'      => '--port',
+    'socket'    => '--socket',
+    'username'  => '--user',
+    'password'  => '--password',
+    'encoding'  => '--default-character-set'
+  }.map { |opt, arg| "#{arg}=#{config[opt]}" if config[opt] }.compact
 
-require 'yaml'
-config = YAML::load(File.read(RAILS_ROOT + "/config/database.yml"))[env]
+  args << config['database']
 
-unless config
-  abort "No database is configured for the environment '#{env}'"
-end
+  exec(find_cmd('mysql5', 'mysql'), *args)
 
-case config["adapter"]
-when "mysql"
-  exec(find_cmd(*%w(mysql5 mysql)),
-       *({ 'host'      => '--host',
-           'port'      => '--port',
-           'socket'    => '--socket',
-           'username'  => '--user',
-           'password'  => '--password',
-           'encoding'  => '--default-character-set'
-         }.map { |opt, arg| "#{arg}=#{config[opt]}" if config[opt] }.compact +
-         [config['database']]))
 when "postgresql"
   ENV['PGHOST']     = config["host"] if config["host"]
   ENV['PGPORT']     = config["port"].to_s if config["port"]
   ENV['PGPASSWORD'] = config["password"].to_s if config["password"]
   exec(find_cmd('psql'), '-U', config["username"], config["database"])
+
 when "sqlite"
   exec(find_cmd('sqlite'), config["database"])
+
 when "sqlite3"
   exec(find_cmd('sqlite3'), config["database"])
-else abort "not supported for this database type"
+
+else
+  abort "Unknown command-line client for #{config['database']}. Submit a Rails patch to add support!"
 end