Topic search in osxphotos help

[RhetTbull]

osxphotos export and query commands have a bewildering number of options (over 100!) and even as the developer, I sometimes have trouble remembering what a specific option is called. As of v0.47.3, I've added topic search to the help command in the form: osxphotos help COMMAND TOPIC. The topic is optional, but if provided, will search for the topic in all the options for the given command and print just those options (with highlighting of the search term). Hope you find this as useful as I do!

For example:

$ osxphotos help export config

Usage: osxphotos export [OPTIONS] [PHOTOS_LIBRARY]... DEST

  Export photos from the Photos database. Export path DEST is required.
  Optionally, query the Photos database using 1 or more search options; if
  more than one option is provided, they are treated as "AND" (e.g. search for
  photos matching all options). If no query options are provided, all photos
  will be exported. By default, all versions of all photos will be exported
  including edited versions, live photo movies, burst photos, and associated
  raw images. See --skip-edited, --skip-live, --skip-bursts, and --skip-raw
  options to modify this behavior.

Options that match 'config':

--load-config <config file path>
                                Load options from file as written with
                                --save-config. This allows
                                you to save a complex export command to file
                                for later reuse. For example: 'osxphotos
                                export <lots of options here>
                                --save-config
                                osxphotos.toml' then  'osxphotos export
                                /path/to/export --load-config
                                osxphotos.toml'. If any other command line
                                options are used in conjunction with --load-
                                config, they will override the corresponding
                                values in the config file.
--save-config <config file path>
                                Save options to file for use with
                                --load-config. File format
                                is TOML. See also
                                --config-only.
--config-only  If specified, saves the
                                config file but does not
                                export any files; must be used with
                                --save-config.