passing partial command arguments to completion functions

[Steve Borho <steve@xxxxxxxxx>]

Hello everyone,

I have a nit I would like to fix in the Mercurial completion function, as seen 
here:

http://www.selenic.com/hg/log/adbf440a81e0/contrib/zsh_completion

The problem is in the way it completes files.  Most file completions are 
performed by asking mercurial for a list of files that we're interested in, 
then passing those files to _wanted.  Here's a snippit for how we complete 
hg add <TAB>

_hg_status() {
  status_files=(${(ps:\0:)"$(_hg_cmd status -0n$1 . 2>/dev/null)"})
}

_hg_unknown() {
  typeset -a status_files
  _hg_status u
  _wanted files expl 'unknown files' _multi_parts / status_files
}

_hg_cmd_add() {
  _arguments -s -w : $_hg_global_opts $_hg_pat_opts $_hg_dryrun_opts \
  '*:unknown files:_hg_unknown'
}


This will ask mercurial for the list of unknown files in the current directory 
`hg status -0nu .` and pass those to _wanted.  This works for most normal 
cases.  Where it falls down is when you're completing a relative path like 
this:

hg add ../foo/bar<TAB>

I need to be able to pass the partial path to hg status, but this is one notch 
above my current belt level :)   Can anyone give me some hints, or point me 
at some completion functions which do something similar?

-- 
Steve Borho (steve@xxxxxxxxx)