pkgmeek: add some pattern-matching functions

(for better pkgmk compatibility)

scripts/pkgmeek

@@ -349,6 +349,21 @@ check_pkg_mtime() { # can be called even if some sources are missing
 	[ "$PKGMK_MTIME_ONLY" = "yes" ] && info "$msg"; return $utd
 }
 
+get_basename() {
+	echo "${1##*/}"
+}
+
+get_filename() {
+	local ABSOLUTE=""
+	[ "$1" = "-a" ] && { ABSOLUTE=1; shift; }
+
+	if [[ $1 =~ ^(http|https|ftp|file)://.*/(.+) ]]; then
+		echo "$PKGMK_SOURCE_DIR/${BASH_REMATCH[2]}"
+	else
+		[ "$ABSOLUTE" ] && echo "$PKGMK_ROOT/$1" || echo "$1"
+	fi
+}
+
 fetch_url() {
 	local u="$1"; local h="$2"; local finished=0; local giturl tag CLONE_ARGS
 	local SAVE_AS REPO OCONTINUE OOUT; local m=0