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|
#!/usr/bin/env bash
#
# To be written
#
# Wrapper script for calling other scripts like so:
#
# nix-script diff-generations 1 2
#
# So the "diff-generations" script looks like a command for "nix-script"
#
usage() {
cat <<EOS >&2
$(basename $0) [options] <command> <commandoptions>
-l | --list-commands List all available commands
-c | --config Use alternative configuration (rc) file
-v Be verbose
-h Show this help and exit
(c) 2015 Matthias Beyer
GPLv2 licensed
EOS
}
LIST_COMMANDS=0
VERBOSE=0
CONFIGFILE=~/.nixscriptsrc
stderr() {
echo "[$(basename $0)]: $*" >&2
}
stdout() {
[ $VERBOSE -eq 1 ] && echo "[$(basename $0)]: $*"
}
script_for() {
echo "$(dirname ${BASH_SOURCE[0]})/nix-script-${1}.sh"
}
SHIFT_ARGS=0
shift_one_more() {
SHIFT_ARGS=$(( SHIFT_ARGS + 1 ))
}
shift_n() {
for n in `seq 0 $1`; do shift; done
echo $*
}
all_commands() {
find $(dirname ${BASH_SOURCE[0]}) -type f -name "nix-script-*.sh"
}
for cmd
do
case $cmd in
"--list-commands" )
LIST_COMMANDS=1
shift_one_more
;;
"-l" )
LIST_COMMANDS=1
shift_one_more
;;
"--config" )
CONFIGFILE=$1
shift_one_more
;;
"-c" )
CONFIGFILE=$1
shift_one_more
;;
"-v" )
export VERBOSE=1
stdout "Verbose now"
shift_one_more
;;
"-h" )
usage
exit 1
;;
* )
if [ ! -n $(script_for $cmd) ]
then
stderr "Unknown flag / command '$cmd'"
exit 1
else
if [ -z "$COMMAND" ]
then
stdout "Found command: '$cmd'"
COMMAND=$cmd
shift_one_more
fi
break
fi
esac
done
if [ ! -f $CONFIGFILE ]
then
stdout "No config file: '$CONFIGFILE', won't override defaults"
else
stdout "Source config: '$CONFIGFILE'"
. $CONFIFILE
fi
if [ $LIST_COMMANDS -eq 1 ]
then
stdout "Listing commands"
for cmd in $(all_commands)
do
echo "$cmd" | sed 's,^\.\/nix-script-,,' | sed 's,\.sh$,,'
done
exit 0
fi
if [ -z "$COMMAND" ]
then
stderr "No command given"
exit 0
fi
stdout "Searching for script for '$COMMAND'"
SCRIPT=$(script_for $COMMAND)
if [ ! -f $SCRIPT ]
then
stderr "Not available: $COMMAND -> $SCRIPT"
exit 1
fi
if [[ ! -x $SCRIPT ]]
then
stderr "Not executeable: $SCRIPT"
exit 1
fi
stdout "Parsing args for '$COMMAND'"
SCRIPT_ARGS=$(shift_n $SHIFT_ARGS $*)
stdout "Calling: '$COMMAND $SCRIPT_ARGS'"
exec bash $SCRIPT $SCRIPT_ARGS
|
