Customizing Application's help

Hydra provides two different help options:

• --help : Application specific help
• --hydra-help Hydra specific help.

Example output of --help:

$ python my_app.py --help
== AwesomeApp ==

This is AwesomeApp!
You can choose a db driver by appending
== Configuration groups ==
Compose your configuration from those groups (db=mysql)

db: mysql, postgresql


== Config ==
This is the config generated for this run.
You can override everything, for example:
python my_app.py db.user=foo db.pass=bar
-------
db:
  driver: mysql
  user: omry
  pass: secret

-------

Powered by Hydra (https://hydra.cc)
Use --hydra-help to view Hydra specific help

This output is generated from the following config group option (selected in config.yaml to be used by default):

hydra/help/my_app_help.yaml

# @package _group_

# App name, override to match the name your app is known by
app_name: AwesomeApp

# Help header, customize to describe your app to your users
header: == ${hydra.help.app_name} ==

footer: |-
  Powered by Hydra (https://hydra.cc)
  Use --hydra-help to view Hydra specific help

# Basic Hydra flags:
#   $FLAGS_HELP
#
# Config groups, choose one of:
#   $APP_CONFIG_GROUPS: All config groups that does not start with hydra/.
#   $HYDRA_CONFIG_GROUPS: All the Hydra config groups (starts with hydra/)
#
# Configuration generated with overrides:
#   $CONFIG : Generated config
#
template: |-
  ${hydra.help.header}

  This is ${hydra.help.app_name}!
  You can choose a db driver by appending
  == Configuration groups ==
  Compose your configuration from those groups (db=mysql)

  $APP_CONFIG_GROUPS

  == Config ==
  This is the config generated for this run.
  You can override everything, for example:
  python my_app.py db.user=foo db.pass=bar
  -------
  $CONFIG
  -------
  
  ${hydra.help.footer}