groovyserv: set supported_archs, platforms; other fixes

Use github portgroup; fixes livecheck. Modernize checksums. Because this
port installs a binary, indicate the architecture of that binary in
supported_archs and indicate platforms {darwin any}. Remove unnecessary
workTarget variable. Simplify to avoid foreach and system. Use leading 0
on octal numbers.

Closes: https://trac.macports.org/ticket/70934

devel/groovyserv/Portfile

@@ -1,7 +1,12 @@
 PortSystem 1.0
+PortGroup			github 1.0
+
+github.setup		kobo groovyserv 0.9 v
+revision			0
+checksums			rmd160  24482827f878985361f8147b60901843a4f37d4b \
+					sha256  975ffbdefecc146a4d234163b4c07319065d975bf4e16e1c914fe357f7decf7f \
+					size    906076
 
-name				groovyserv
-version				0.9
 categories			devel groovy
 maintainers			nomaintainer
 description			GroovyServ makes Groovy startup time quicker, by pre-invoking groovy as a TCP/IP server.
@@ -11,15 +16,12 @@ long_description	In the case of scripting in dynamic-type languages, quick respo
 					be intolerable. \
 					GroovyServ reduces the startup time of JVM and Groovy runtime significantly.
 homepage			https://kobo.github.io/groovyserv/
-platforms			darwin
+platforms			{darwin any}
+supported_archs		x86_64
 distname			${name}-${version}-macosx-x86_64-bin
-master_sites		https://github.com/downloads/kobo/groovyserv
-checksums 			md5     99dc7505ba03fe4ed22353e492e20121 \
-                    sha1    8c3ee10527af0f390a15a3d75b5199b1fa05c90e \
-                    rmd160  24482827f878985361f8147b60901843a4f37d4b
+github.tarball_from	downloads
 
 worksrcdir			${name}-${version}
-set workTarget		""
 
 use_zip	         	yes
 use_configure 		no
@@ -28,21 +30,17 @@ build {}
 
 pre-destroot {
 	# Remove extraneous bat files
-	foreach f [glob -directory ${worksrcpath}${workTarget}/bin *.bat] {
-		file delete $f
-	}
+	delete {*}[glob ${worksrcpath}/bin/*.bat]
 }
 
 destroot	{
 	# Create the target java directory
-	xinstall -m 755 -d ${destroot}${prefix}/share/devel/${name}
+	xinstall -m 0755 -d ${destroot}${prefix}/share/devel/${name}
 
 	# Copy over the needed elements of our directory tree
-	file copy ${worksrcpath}/lib     						\
-			  ${worksrcpath}/bin 							\
-			  ${destroot}${prefix}/share/devel/${name}
+	copy ${worksrcpath}/lib ${worksrcpath}/bin ${destroot}${prefix}/share/devel/${name}
 
 	# Symlink groovyserv into the bin directory
-	system "cd ${destroot}${prefix}/bin && ln -s ${prefix}/share/devel/${name}/bin/groovyserver"
-	system "cd ${destroot}${prefix}/bin && ln -s ${prefix}/share/devel/${name}/bin/groovyclient"
+	ln -s ${prefix}/share/devel/${name}/bin/groovyserver ${destroot}${prefix}/bin
+	ln -s ${prefix}/share/devel/${name}/bin/groovyclient ${destroot}${prefix}/bin
 }