How to strip off common prefix for array elements?

How to strip off common prefix for array elements?

[Andrej Borsenkow]

Consider the case:

cdpath=(~ ~/src ~/build/mips)
cd zshTAB -> gives me zsh-3.1.2 which is O.K., but I don't have any chance
to cd into build, because ~/src stays in the way.

The problem amounts to:

array of possile completions:
  ~/src/zsh-3.1.2 ~/build/mips/zsh-3.1.2
array of directories
  ~ ~/src ~/build/mips
Now I have to find the longest prefix from $cdpath elements so, that
remaining parts of completions are still uniq. 

the best way I can think of involves quite tedious loops over first and
second array. I had a vague hope, that it could be done with ZSH's magic
in parameter substitution. BTW somebody has an idea of extensions to allow
this be done (in general way)?

I am referring to Zoltan's cdmatch function. Currently it is nice 
one-liner - can it do the above and still remain small?

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Re: How to strip off common prefix for array elements?

[Bart Schaefer]

On Feb 19,  2:10pm, Andrej Borsenkow wrote:
} Subject: How to strip off common prefix for array elements?
}
} Consider the case:
} 
} cdpath=(~ ~/src ~/build/mips)
} cd zshTAB -> gives me zsh-3.1.2 which is O.K., but I don't have any chance
} to cd into build, because ~/src stays in the way.

So what you're trying to do is use completion to disambiguate when two or
more cdpath directories have same-named subdirectories?

Try this variant:

# Start of cdmatch.
# Save in your functions directory and autoload, then do
# compctl -x 'S[/][~][./][../]' -g '*(-/)' - \
#         'n[-1,/], s[]' -K cdmatch -U -- cd pushd
#
# Completes directories for cd, pushd, ... anything which knows about cdpath.
# You do not have to include `.' in your cdpath.
#
# It works properly only if $ZSH_VERSION > 3.0-pre4.  Remove `emulate -R zsh'
# for all other values of $ZSH_VERSION > 2.6-beta2. For earlier versions
# it still works if RC_EXPAND_PARAM is not set or when cdpath is empty.
emulate -R zsh
setopt localoptions
local narg pref cdp

read -nc narg
read -Ac pref

cdp=(. $cdpath)
reply=( ${^cdp}/${pref[$narg]}*$2(-/DN^M) )

return
# End of cdmatch.

It could use some work, but the basic idea is that you don't remove any
prefixes, and use -U to replace the entire word with the full completion.
As is, the above is really only usable with menucomplete set, but it's a
start in the right direction.


-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com