gtksourceview4: new port

This is API version 4 of the GtkSourceView widget using GTK+ 3.
Forthcoming API version 5 will support GTK+ 4.

Installs in parallel with earlier verions 3, 2 and 1 without conflict.

gnome/gtksourceview4/Portfile

@@ -0,0 +1,83 @@
+# -*- coding: utf-8; mode: tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:ft=tcl:et:sw=4:ts=4:sts=4
+
+PortSystem          1.0
+PortGroup           active_variants 1.1
+PortGroup           compiler_blacklist_versions 1.0
+PortGroup           gobject_introspection 1.0
+
+name                gtksourceview4
+set gname           gtksourceview
+version             4.0.0
+license             LGPL-2.1+
+set branch          [join [lrange [split ${version} .] 0 1] .]
+maintainers         {devans @dbevans} openmaintainer
+categories          gnome
+platforms           darwin
+description         GtkSourceView-4.0 is a source highlighting text widget for GTK+ 3
+
+long_description    GtkSourceView is a text widget that extends the standard \
+                    GTK+ 3.x text widget GtkTextView. It improves GtkTextView \
+                    by implementing syntax highlighting and other features \
+                    typical of a source editor. This port contains version 4 of the \
+                    GtkSourceView widget. Port gtksourceview3 contains version 3 of \
+                    widget, gtksourceview2 contains version 2 and port gtksourceview \
+                    contains version 1.
+
+homepage            https://wiki.gnome.org/Projects/GtkSourceView
+master_sites        gnome:sources/${gname}/${branch}/
+distname            ${gname}-${version}
+use_xz              yes
+
+checksums           rmd160  e83485cc439f36efeb9b93022ae35c285ff4bb6b \
+                    sha256  6e5c7a28a7fa456a89f289f0659c57100cc09fe692db6abfcc23f7ade5d5b32a \
+                    size    1352196
+
+depends_build       port:pkgconfig \
+                    port:gtk-doc
+
+depends_lib         path:lib/pkgconfig/glib-2.0.pc:glib2 \
+                    port:gettext \
+                    port:gtk3 \
+                    port:libxml2 \
+                    port:vala
+
+gobject_introspection yes
+
+# blacklist compilers that do not support C11 (redefinition of typedef ‘GtkSourceTag’ at gtksourceview/gtksourcetag.h:35)
+compiler.blacklist  *gcc* {clang < 300}
+
+configure.args      --enable-compile-warnings=no \
+                    --disable-silent-rules
+
+test.run            yes
+test.target         check
+
+variant quartz {}
+
+if {[variant_isset quartz]} {
+    require_active_variants gtk3 quartz
+} else {
+    require_active_variants gtk3 x11
+}
+
+variant glade description {Install a glade catalog file} {
+    configure.args-append   --enable-glade-catalog
+    depends_lib-append      port:glade
+}
+
+post-destroot {
+    set docdir ${prefix}/share/doc/${name}
+    xinstall -d ${destroot}${docdir}
+    xinstall -m 644 -W ${worksrcpath} AUTHORS COPYING \
+        NEWS README ${destroot}${docdir}
+
+# glade expects catalog modules and libraries to have a .so suffix
+
+    if {[variant_isset glade]} {
+        set libdir ${prefix}/lib
+        ln -s ${libdir}/libgtksourceview-3.0.dylib ${destroot}${libdir}/libgtksourceview-3.0.so
+    }
+}
+
+livecheck.type      gnome
+livecheck.name      ${gname}