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I have a command that can accept absolute and relative paths (just like ls) as first argument

# absolute
mycommand $HOME/.local
mycommand /tmp/
# relative
mycommand ../build
mycommand file_in_cwd.txt

reasonable completions for the second argument depend on the first argument. My draft for it looks like that:

__mycommand_secondarg() {
  if [[ $words[2] = \$* || $words[2] = /* ]]; then
    # do something
  else
    # do something else
  fi
}

I'm wondering, did I miss relevant cases here? I thought about arguments that start with a slash /, a dollar $ (I assume this will most likely be an environment variable like $HOME that is an absolute path, if it's a subshell, substitution, or variable that will be resolved to a relative path, then I accept this as too complex for now), one or two dots ., or a somewhat normal character (maybe escaped).

Also, is there maybe a completion helper function that can tell me if a words[…] is an absolute or relative path?

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