Hammer CLI

When hammer is installed with multiple plugins the startup slows down. Profiling showed we're loosing quite some time in fast-gettext's initialisation and translation methods. It loads all available .mo files for all languages in all plugins regardless what language is used. Another inefficiency lies in multidomain translations we're using (one domain per plugin). For each translation fast-gettext iterates over all domains until it finds the key.

Simple measurement for hammer with plugins:

• hammer_cli_foreman
• hammer_cli_foreman_bootdisk
• hammer_cli_foreman_discovery
• hammer_cli_foreman_docker
• hammer_cli_gutterball
• hammer_cli_import
• hammer_cli_katello

Standard hammer configuration on ruby 1.9.3:

time hammer --help > /dev/null
real    0m1.584s
user    0m1.453s
sys    0m0.130s

With only one translation domain:

time hammer --help > /dev/null
real    0m1.109s
user    0m1.017s
sys    0m0.092s

The solution seems to be to create custom fast-gettext translation repository that would merge the keys at load time to get rid of the search loops in each translation. Loading the .mo files lazily might also improve the performance.