Usage:
jvn_comp [-f | --command-line <content>]
         [-C | --cursor-position <position>]
         [-w | --current-word <word>]
         [-p | --previous-word <word>]
         [-c | --command-name <name>]
         [-i | --word-index <index>]
         [-a | --all-words <word: ?>]
         [-F | --shell-flag <bash/fish/powershell/zsh>]

This program generates completion suggestions
  for the `jvn` command,
to be used with completion scripts.