Build time reduction via parallelization for AUR package: tango-icon-theme-extras

convert-parallel-22x22.patch

--- Makefile.am.slow_and_horrible	2006-01-10 14:22:35.000000000 -0800
+++ Makefile.am.fast_and_awesome	2019-12-22 15:54:39.516918706 -0800
@@ -32,8 +32,6 @@
 if ENABLE_ICON_FRAMING
 	$(mkinstalldirs) $(DESTDIR)$(themedir)/24x24/$(context)
 	(cd $(DESTDIR)$(themedir) && \
-	for icon in $(icons_DATA); do \
-		$(CONVERT) $(size)/$(context)/$$icon 24x24/$(context)/$$icon; \
-	done)
+	parallel --will-cite -- $(CONVERT) $(size)/$(context)/{} 24x24/$(context)/{} ::: $(icons_DATA))
 	(cd $(DESTDIR)$(themedir)/24x24 && $(ICONMAP) -c $(context))
 endif

convert-parallel-scalable.patch

--- Makefile.am.slow_and_horrible	2006-01-10 14:22:32.000000000 -0800
+++ Makefile.am.fast_and_wonderful	2019-12-22 15:51:55.070733552 -0800
@@ -33,8 +33,6 @@
 	for i in 32 48 64 72 96 128; do \
 		pngdir="$(DESTDIR)$(themedir)/$${i}x$${i}/$(context)"; \
 		$(mkinstalldirs) $$pngdir; \
-		for icon in $(icons_DATA); do \
-			$(top_builddir)/svg2png.sh $$i $$pngdir $$icon; \
-		done; \
+		parallel --will-cite -- $(top_builddir)/svg2png.sh $$i $$pngdir {} ::: $(icons_DATA); \
 		(cd $(DESTDIR)$(themedir)/$${i}x$${i} && $(ICONMAP) -c $(context)); \
 	done

PKGBUILD.diff

--- PKGBUILD.original	2019-12-22 15:46:17.584465748 -0800
+++ PKGBUILD.parallel	2019-12-22 15:58:51.409844193 -0800
@@ -3,25 +3,41 @@
 # Contributor: Thayer Williams <thayer at archlinux dot org>
 # Contributor: James Rayner <james at archlinux dot org>
 # Contributor: William Rea <sillywilly at gmail dot com>
+# Contributor: Justin Gottula <justin@jgottula.com>
 
 pkgname=tango-icon-theme-extras
 pkgver=0.1.0
-pkgrel=7
+pkgrel=8
 pkgdesc="Extra icons for Tango"
 arch=('any')
 url="http://tango.freedesktop.org"
 license=('CCPL:by-sa')
 depends=('tango-icon-theme')
-makedepends=('imagemagick' 'icon-naming-utils')
+makedepends=('imagemagick' 'icon-naming-utils' 'parallel')
 options=(!strip !zipman)
 source=(${url}/releases/${pkgname}-${pkgver}.tar.gz
-        rsvg.patch)
+        rsvg.patch
+        convert-parallel-scalable.patch
+        convert-parallel-22x22.patch)
 md5sums=('caaceaec7b61f1cbda0db9842f9db281'
-         '80790fcc8c4f26269be53960c4c39cb9')
+         '80790fcc8c4f26269be53960c4c39cb9'
+         'ffba2bea0d7108de73519dd5366402c9'
+         'a09bd4446992e74366750fa935047338')
 
 prepare() {
   cd ${pkgname}-${pkgver}
   patch -p0 < "${srcdir}/rsvg.patch"
+
+  # patch the makefiles so they will run parallel instances of ImageMagick,
+  # instead of painfully running convert instances serially one-file-at-a-time
+  # (DRAMATIC reduction in package build time for multi-core machines!)
+  for file in scalable/*/Makefile.am; do
+    patch -uN $file "${srcdir}/convert-parallel-scalable.patch"
+  done
+  for file in 22x22/*/Makefile.am; do
+    patch -uN $file "${srcdir}/convert-parallel-22x22.patch"
+  done
+
   autoreconf -fi
 }