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|
#!/bin/bash
#
# parse command line flags of the form --foo=bar and print out an eval-able line
name=$0
function die() {
echo "$name: $*" >&2
exit 1
}
# eat our flags first
while : ; do
flag=$1
shift || break
case $flag in
--flags-req=*) # req'd flags
oIFS="$IFS" IFS=","
vars_req=(${flag#*=})
IFS="$oIFS"
;;
--flags-opt=*) # optional flags
oIFS="$IFS" IFS=","
vars_opt=(${flag#*=})
IFS="$oIFS"
;;
--name=*) # name to report errors as
name=${flag#*=}
;;
--flags-only) # report only flags
show_flags=true show_args=false
;;
--no-flags) # report only remaining args
show_flags=false show_args=true
;;
--) # end of our flags; external flags follow
break
;;
esac
done
# consume external flags
while : ; do
flag=$1
shift || break
case $flag in
--*=*)
;;
--) # end of external flags; uninterpreted arguments follow
break
;;
*) # pass unrecognized arguments through
args="$args '$flag'"
continue
;;
esac
flagname=${flag%%=*}
flagname=${flagname#--}
flagval=${flag#*=}
# check if this flag is declared
case " ${vars_req[*]} ${vars_opt[*]} " in
*" $flagname "*)
;;
*) # pass unrecognized flags through
args="$args '$flag'"
continue
;;
esac
eval $flagname=\"$flagval\"
done
# check that we have all required flags
for var in ${vars_req[@]}; do
${!var+true} die "--$var is required"
done
# now print 'em out
if ${show_flags:-true}; then
for var in ${vars_req[@]} ${vars_opt[@]}; do
# only print those that are set (even to an empty string)
${!var+echo $var="'${!var}'"}
done
fi
if ${show_args:-true}; then
for arg in "$@"; do # get quotes right
args="$args '$arg'"
done
echo "set -- $args"
fi
|
