Find eligible input files (FESOM's output files)

[mandresm]

In SEAMORE, the class FesomOutputDir finds eligible FESOM files that match a name pattern specified in the ENV and a time period (https://github.com/FESOM/seamore/blob/main/lib/fesom_output_dir.rb). This class name is misleading, it's more about finding out eligible input files for SEAMORE, and less about the FESOM's output structure.

The following features might be or not necessary (to be decided as we develop it):

• [x] Something equivalent to PATTERN_ENV_KEY needs to be defined in the input yaml file (https://github.com/FESOM/seamore/blob/7725366f7b68ea3824ac6baa500ea49531722b72/lib/fesom_output_dir.rb#L4-L19).
  • Requires that the files are all labelled with year, month and day together with the variable_id. I am not sure that this needs to be a limitation, because the dates should also be defined within the file. Only some of those labels might be required depending of the frequency of the output.
  • Raises an error if all these are not defined in the pattern
• [x] Lists all the files that matches the PATTERN_ENV_KEY in the given directory (https://github.com/FESOM/seamore/blob/7725366f7b68ea3824ac6baa500ea49531722b72/lib/fesom_output_dir.rb#L24-L27) and that match the
• [x] Removes all duplicate files, for example introduced via symlinks using realpath (https://github.com/FESOM/seamore/blob/7725366f7b68ea3824ac6baa500ea49531722b72/lib/fesom_output_dir.rb#L29-L34)
• [x] if first_year and last_year are defined find the files that match those dates (https://github.com/FESOM/seamore/blob/7725366f7b68ea3824ac6baa500ea49531722b72/lib/fesom_output_dir.rb#L36-L45). We probably want to generalize this a bit more so that users can specify also the months and days. Instead, I suggest to use first_date and last_date or something similar.
• [x] All eligible input files are sorted, I guess from dates times to later dates (https://github.com/FESOM/seamore/blob/7725366f7b68ea3824ac6baa500ea49531722b72/lib/fesom_output_dir.rb#L48)
• [x] to_s method puts all eligible files into a string (https://github.com/FESOM/seamore/blob/7725366f7b68ea3824ac6baa500ea49531722b72/lib/fesom_output_dir.rb#L52-L54)