pkgdelta: use human_to_size to parse --min-pkg-size

Update the documentation accordingly to mention that users can expect
huamn readable sizes to be acceptable.

Signed-off-by: Dave Reisner <dreisner@archlinux.org>

doc/pkgdelta.8.txt

@@ -35,7 +35,8 @@ Options
 
 *--min-pkg-size <size>*::
 	Minimal size of the package file in bytes to be considered for delta creation.
-	Default value: 1048576 bytes = 1MiB
+	Default value: 1048576 bytes = 1MiB. This may be any absolute size in bytes, or
+	a human readable value such as `4 MiB` or `3.5MB`.
 
 *-q, \--quiet*::
 	Be quiet. Do not output anything but warnings and errors.

scripts/pkgdelta.sh.in

@@ -54,8 +54,8 @@ This delta file can then be added to a database using repo-add.\n\n")"
 	echo
 	printf -- "$(gettext "Options:\n")"
 	printf -- "$(gettext "  -q, --quiet       minimize output\n")"
-	printf -- "$(gettext "  --min-pkg-size    minimum package size before deltas are generated (bytes)\n")"
-	printf -- "$(gettext "  --max-delta-size  percent of package size above which deltas will be discarded\n")"
+	printf -- "$(gettext "  --min-pkg-size    minimum package size before deltas are generated\n")"
+	printf -- "$(gettext "  --max-delta-size  percent of new package above which the delta will be discarded\n")"
 }
 
 version() {
@@ -66,6 +66,8 @@ This is free software; see the source for copying conditions.\n\
 There is NO WARRANTY, to the extent permitted by law.\n")"
 }
 
+m4_include(library/human_to_size.sh)
+
 isnumeric() {
 	[[ $1 != *[!0-9]* ]]
 }
@@ -176,15 +178,14 @@ while :; do
 		-q|--quiet)
 			QUIET=1;;
 		--min-pkg-size)
-			if ! isnumeric "$2"; then
+			if ! min_pkg_size=$(human_to_size "$2"); then
 				echo "invalid argument '$2' for option -- '$1'"
 				exit 1
 			fi
-			min_pkg_size=$2
 			shift ;;
 		--max-delta-size)
-			arg=$(echo "$2" | awk '{print $1 * 100}')
-			if ! isnumeric "$arg" || (($arg > 200)); then
+			arg=$(awk -v val="$2" 'BEGIN { print val * 100 }')
+			if ! isnumeric "$arg" || (( arg > 200 )); then
 				echo "invalid argument '$2' for option -- '$1'"
 				exit 1
 			fi