Re: How to autocomplete after 'which'?

[Eric Blake]

On 05/21/2010 09:50 AM, Peng Yu wrote:
> complete -c works. I'm not familar with bash-completion package. How
> to customize search path for each command.

By using appropriate complete invocations for each command, and lots of
shell functions.

> 
> For exmaple, I want search in $PYTHONPATH after the command python.

bash-completion could do that for you, too.

$ complete -p python
complete -o filenames -F _python python
$ type _python
_python is a function
_python ()
{
    local prev cur i;
    COMPREPLY=();
    cur=`_get_cword`;
    prev=${COMP_WORDS[COMP_CWORD-1]##*/};
    case "$prev" in
        -Q)
            COMPREPLY=($( compgen -W "old new warn warnall" -- "$cur" ));
            return 0
        ;;
        -W)
            COMPREPLY=($( compgen -W "ignore default all module once
error"             -- "$cur" ));
            return 0
        ;;
        -c)
            _filedir '@(py|pyc|pyo)';
            return 0
        ;;
        !(python|-?))
            [[ ${COMP_WORDS[COMP_CWORD-2]} != -@(Q|W) ]] && _filedir
        ;;
    esac;
    for ((i=0; i < ${#COMP_WORDS[@]}-1; i++ ))
    do
        if [[ ${COMP_WORDS[i]} == -c ]]; then
            _filedir;
        fi;
    done;
    if [[ "$cur" != -* ]]; then
        _filedir '@(py|pyc|pyo)';
    else
        COMPREPLY=($( compgen -W "- -d -E -h -i -O -Q -S -t -u
   -U -v -V -W -x -c" -- "$cur" ));
    fi;
    return 0
}

Actually, I don't see any mention of PYTHONPATH in that function, so you
may want to file an enhancement request against the bash-completion
package to improve their _python() function to also consider PYTHONPATH,
rather than just *.py[co] files.

> 
> BTW, where is the manual for the -c option of complete. There are too
> many 'complete' in man bash. Would you please point me which section
> is relevant to complete -c.

'help complete' is the easiest way to see the short details; other than
that, look for complete under 'SHELL BUILTIN COMMANDS' in the man page.

-- 
Eric Blake   eblake@redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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