[gentoo-dev] Bash completion for emerge

[Geert Bevin <gbevin@theleaf.be>]

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Hi all,

as a diversion I amused myself by trying out the bash programmable
completion. I currently have it working for emerge. I'm not a bash
expert and surely this code can be written in a much better way, but it
already works.

To use it, just add the atachment to /etc/bash_completion.

Hope this is of some help to someone,

Geert
-- 
Geert Bevin
the Leaf sprl/bvba
"Use what you need"           Pierre Theunisstraat 1/47
http://www.theleaf.be         1030 Brussels
gbevin@theleaf.be             Tel & Fax +32 2 241 19 98

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# Gentoo emerge completion.
#
_emerge()
{
	local cur prev grepcmd sedcmd setsma setbig

	COMPREPLY=()
	cur=${COMP_WORDS[COMP_CWORD]}
	prev=${COMP_WORDS[COMP_CWORD-1]}

	if [ $COMP_CWORD -lt 2 ]; then
		cd /usr/portage
		grepcmd="grep -E ^$cur.*"
		sedcmd="sed -e /CVS/d \
						-e /BUGS-TODO/d \
						-e /ChangeLog.*/d \
						-e /header.txt/d \
						-e /skel.build/d \
						-e /distfiles/d \
						-e /eclass/d \
						-e /files/d \
						-e /incoming/d \
						-e /packages/d \
						-e /profiles/d \
						-e /scripts/d"
		setsma=`compgen -S '/' -G "*" | $sedcmd`
		setbig=`compgen -G "*/*" | $sedcmd`
		if [ $cur ]; then
			if [ `echo $cur | grep '/'` ]; then
				COMPREPLY=( $( echo "$setbig" | $grepcmd ) )
			else
				if [ `echo "$setsma" | $grepcmd | grep '/' | wc -l` = 1 ]; then
					COMPREPLY=( $( echo "$setbig" | $grepcmd ) )
				else
					COMPREPLY=( $( echo "$setsma" | $grepcmd ) )
				fi
			fi
		else
			COMPREPLY=( $( echo "$setsma" ) )
		fi
	fi
	
	return 0
}
complete -F _emerge emerge