Creating autocomplete script with sub commands

Question

I\'m trying to create an autocomplete script for use with fish; i\'m porting over a bash completion script for the same program.

The program has three top level commands,

Answer 1

I guess you are aware that return 0 means true and that return 1 means false?

From your output it looks like your needs_command function is not working properly, thus showing bar even when it has subcommands.

I just tried the following code and it works as expected:

function __fish_prog_needs_command
  set cmd (commandline -opc)
  if [ (count $cmd) -eq 1 -a $cmd[1] = 'prog' ]
    return 0
  end
  return 1
end

function __fish_prog_using_command
  set cmd (commandline -opc)
  if [ (count $cmd) -gt 1 ]
    if [ $argv[1] = $cmd[2] ]
      return 0
    end
  end
  return 1
end

complete -f -c prog -n '__fish_prog_needs_command' -a bar

complete -f -c prog -n '__fish_prog_needs_command' -a foo
complete -f -c prog -n '__fish_prog_using_command foo' -a a
complete -f -c prog -n '__fish_prog_using_command foo' -a b
complete -f -c prog -n '__fish_prog_using_command foo' -a c

complete -f -c prog -n '__fish_prog_needs_command' -a baz

Output from completion:

➤ prog 
bar  baz  foo
➤ prog foo 
a  b  c
➤ prog foo

Is this what you want?