cpan2port: various improvements

* Use full shasum
* Download to macports-contrib in case any other ports need the same files
* Properly define $worksrcdir
* Enable livecheck

sysutils/cpan2port/Portfile

@@ -4,10 +4,8 @@ PortSystem          1.0
 PortGroup           github 1.0
 PortGroup           perl5 1.0
 
-set git_shasum      4207b22
+github.setup        macports macports-contrib 4207b227800b8ce6ba7db02641a1b1a66b3218de
 set git_date        20180228
-
-github.setup        macports macports-contrib ${git_shasum}
 name                cpan2port
 version             0.1.1_${git_date}
 categories          sysutils macports perl
@@ -35,8 +33,11 @@ depends_run-append  port:p${perl5.major}-carp-clan \
                     port:p${perl5.major}-pod-simple \
                     port:p${perl5.major}-yaml
 
+dist_subdir         macports-contrib
+worksrcdir          ${worksrcdir}/${name}
+
 configure {
-    reinplace "s|#! /usr/bin/env perl|#!${prefix}/bin/perl${perl5.major}|g" ${worksrcpath}/${name}/${name}
+    reinplace "s|#! /usr/bin/env perl|#!${prefix}/bin/perl${perl5.major}|g" ${worksrcpath}/${name}
 }
 
 # should be implied by overriding configure:
@@ -45,10 +46,7 @@ configure.ccache    no
 build {}
 
 destroot {
-    xinstall -m 755 ${worksrcpath}/${name}/${name} ${destroot}${prefix}/bin/${name}
+    xinstall -m 755 ${worksrcpath}/${name} ${destroot}${prefix}/bin/${name}
     xinstall -d ${destroot}${prefix}/share/doc/${name}
-    xinstall -m 644 ${worksrcpath}/${name}/COPYING ${destroot}${prefix}/share/doc/${name}/COPYING
+    xinstall -m 644 ${worksrcpath}/COPYING ${destroot}${prefix}/share/doc/${name}/COPYING
 }
-
-# TODO: check the latest revision of the file
-livecheck.type      none