ttf: introduce update-fonts bbclass and change all ttf recipes to use it

* without this ttf.inc had to set RRECOMMENDS and
  postinst/postrm without PN suffix to cover all
  subpackages created in ttf recipes

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/classes/update-fonts.bbclass

@@ -0,0 +1,40 @@
+
+update_fonts_postinst() {
+    if [ -z "$D" ]; then
+        update-fonts
+    fi
+}
+
+# the same but keep it separate for now
+update_fonts_postrm() {
+    if [ -z "$D" ]; then
+        update-fonts
+    fi
+}
+
+python populate_packages_append () {
+    update_fonts_pkgs = d.getVar('UPDATE_FONTS_PACKAGES', True).split()
+
+    for pkg in update_fonts_pkgs:
+        postinst = d.getVar('pkg_postinst_%s' % pkg, True) or d.getVar('pkg_postinst', True)
+        if not postinst:
+            postinst = '#!/bin/sh\n'
+        postinst += d.getVar('update_fonts_postinst', True)
+        d.setVar('pkg_postinst_%s' % pkg, postinst)
+
+        postrm = d.getVar('pkg_postrm_%s' % pkg, True) or d.getVar('pkg_postrm', True)
+        if not postrm:
+            postrm = '#!/bin/sh\n'
+        postrm += d.getVar('update_fonts_postrm', True)
+        d.setVar('pkg_postrm_%s' % pkg, postrm)
+
+        d.appendVar('RDEPENDS_%s' % pkg, ' font-update-common')
+}
+
+python __anonymous() {
+    if not bb.data.inherits_class('native', d) and not bb.data.inherits_class('cross', d):
+        updatefonts_check = d.getVar('UPDATE_FONTS_PACKAGES')
+        if not updatefonts_check:
+            bb_filename = d.getVar('FILE')
+            raise bb.build.FuncFailed, "\n\n\nERROR: %s inherits update-fonts but doesn't set UPDATE_FONTS_PACKAGES" % bb_filename
+}