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# ghc-pkg command line completion for bash
#
# Copyright 2006-2007 Lennart Kolmodin <kolmodin@dtek.chalmers.se>
_ghc-pkg-get-ghc-pkg()
{
echo ghc-pkg
}
_ghc-pkg-pkg-fields()
{
# usage: _ghc-pkg-pkg-fields pkg-id
#
# list all fields of the pkg-id
# same fields for all packages but different in different versions of
# ghc-pkg? this can probably be done better/faster
if [[ -z "$1" ]]; then
echo "usage: _ghc-pkg-pkg-fields pkg-id"
return 1
fi
local fields
fields="$( $(_ghc-pkg-get-ghc-pkg) describe $1 )"
#if [[ fields != *"cannot find package"* ]]; then
echo "$fields" | grep ".*:.*" | sed "s/^\(.*\):.*\$/\1/"
#fi
}
_ghc-pkg-pkg-ids()
{
# usage: _ghc-pkg-pkg-ids
#
# simply lists all package ids known by ghc-pkg.
$(_ghc-pkg-get-ghc-pkg) list --simple-output
}
_ghc-pkg-pkgs()
{
# usage: _ghc-pkg-pkgs [include-pkgs] [include-ids]
#
# with optional parameter include-pkgs it will list all packages known
# to ghc-pkg.
# with optional parameter include-ids it will list all package-ids known
# to ghc-pkg.
local pkgs
local result
pkgs=( $( _ghc-pkg-pkg-ids ) )
result=( )
local withPkgs="no" withIds="no"
while [[ -n "$1" ]]; do
case "$1" in
include-pkgs)
withPkgs="yes" ;;
include-ids)
withIds="yes" ;;
*)
echo "unknown parameter '$1' to _ghc-pkg-pkgs"
return 1 ;;
esac
shift
done
# user must supply either include-pkgs, include-ids or both
if [[ $withPkgs != "yes" && $withIds != "yes" ]]; then
echo "usage: _ghc-pkg-pkgs [include-pkgs] [include-ids]"
return 1
fi
# find all packages if the user requested them
if [[ $withPkgs == "yes" ]]; then
# O(n^2) algorithm to exclude duplicates
for p in ${pkgs[*]}; do
p="${p//-[0-9.]*/}"
for existing in ${result[*]}; do
if [[ "$existing" == "$p" ]]; then
continue 2
fi
done
result=( "${result[@]}" "${p}" )
done
fi
# include all pkg-ids if requested
if [[ $withIds == "yes" ]]; then
result=( "${result[@]}" "${pkgs[@]}" )
fi
# we are finished, echo the result
echo "${result[*]}"
# happy ending
return 0
}
_ghc-pkg()
{
local cur
cur=${COMP_WORDS[COMP_CWORD]}
COMPREPLY=()
local actions flags
actions='register update unregister expose hide list latest describe field'
dbflags="--user \
--global \
-f --package-conf= \
--global-conf="
registerflags="--force \
-g --auto-ghci-libs \
-D --define-name="
listflags="--simple-output"
flags="$dbflags \
$registerflags \
$listflags \
-? --help \
-V --version"
# if it's the users first word; complete it and return
if (($COMP_CWORD == 1)); then
COMPREPLY=( $( compgen -W "$actions $flags" -- $cur ) )
return 0
fi
# now we know we have at least one word written
local action="unknown" \
prev numwords \
cword act
prev=${COMP_WORDS[COMP_CWORD-1]}
numwords=${#COMP_WORDS[@]}
# find the action with O(n*m) algorithm
# where n = ${#COMP_WORDS[*]}
# m = number of actions
for cword in ${COMP_WORDS[*]}; do
for act in $actions; do
if [[ "$cword" == "$act" ]]; then
action=$cword
fi
done
done
case $action in
register|update)
# we want to complete both flags and paths, how?
# we do it by checking if the user has started to write a flag
# or a path, and then decide what to complete.
# that is, to complete a flag, the user must start to write a '-'
if [[ "$cur" == -* ]]; then
# (we assume) it's the start of a flag
# set COMPREPLY to flags relevant to these actions
COMPREPLY=( $( compgen -W "$dbflags $registerflags" -- $cur ) )
fi
;;
unregister|expose|hide|list|describe)
# all these actions can be completed with exactly one argument,
# a pkg-id.
COMPREPLY=( $( compgen -W "$dbflags" -- $cur ) )
# add special flags for some actions
if [[ "$action" == "list" ]]; then
COMPREPLY+=( $( compgen -W "$listflags" -- $cur ) )
fi
COMPREPLY+=( $( compgen -W "$( _ghc-pkg-pkgs include-ids )" -- $cur ) )
;;
latest)
# complete only packages, not package ids
COMPREPLY=( $( compgen -W "$( _ghc-pkg-pkgs include-pkgs )" -- $cur ) )
;;
field)
# we should always complete on the flags...
COMPREPLY=( $( compgen -W "$dbflags" -- $cur ) )
# then, we should either complete the package name or the field
# lets find out which one
# find the number of words in COMP_WORDS before COMP_CWORD that
# isn't flags. it should be 2 or 3 for us to complete it,
# exactly 2 if we should complete the package name
# exactly 3 if we should complete the field name
# otherwise, don't do any additional completion except the
# flags
# count the number of non flags up till the current word
local numnonflags=0 lastword i
for (( i=0 ; $i < $COMP_CWORD ; i++ )); do
if [[ ${COMP_WORDS[$i]} != -* ]]; then
lastword=${COMP_WORDS[$i]}
numnonflags=$(( ++numnonflags ))
fi
done
case $numnonflags in
2)
# complete on pkg-ids
COMPREPLY+=( $( compgen -W "$( _ghc-pkg-pkgs include-ids )" -- $cur ) ) ;;
3)
# complete on fields
COMPREPLY+=( $( compgen -W "$( _ghc-pkg-pkg-fields $lastword )" -- $cur ) ) ;;
esac
;;
*)
# unknown action, not yet given by the user
# return all possible completions
COMPREPLY=( $( compgen -W "$actions $flags" -- $cur ) )
;;
esac
}
complete -F _ghc-pkg -o default ghc-pkg
# vim: set ft=sh tw=80 sw=4 et :
|
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