xbps-src: revamped build_style.

By default now it's assumed that if $build_style is not set, the template
uses 'custom-install' build, .e.g do_{build,configure,install}.

If it's set, a helper with the same name with .sh extension will be sourced
to set do_{build,configure,install} phases.

The exception is "meta-template" which currently it must be set via
build_style, probably will change in the future.

xbps-src/helpers/configure.sh

@@ -0,0 +1,12 @@
+#
+# This helper is for templates using configure scripts (not generated
+# by the GNU autotools).
+#
+
+do_configure() {
+	[ -z "$configure_script" ] && configure_script="./configure"
+	${configure_script} ${configure_args}
+}
+
+# configure scripts use make(1) to build/install.
+. $XBPS_HELPERSDIR/gnu-makefile.sh

xbps-src/helpers/gnu-configure.sh

@@ -0,0 +1,18 @@
+#
+# This helper is for templates using GNU configure script.
+#
+
+# This variable can be used for packages wanting to use common arguments
+# to GNU configure scripts.
+#
+export CONFIGURE_SHARED_ARGS="--prefix=/usr --sysconfdir=/etc \
+	--infodir=/usr/share/info --mandir=/usr/share/man \
+	--localstatedir=/var"
+
+do_configure() {
+	[ -z "$configure_script" ] && configure_script="./configure"
+	${configure_script} ${CONFIGURE_SHARED_ARGS} ${configure_args}
+}
+
+# GNU configure scripts use make(1) to build/install.
+. $XBPS_HELPERSDIR/gnu-makefile.sh

xbps-src/helpers/gnu-makefile.sh

@@ -0,0 +1,26 @@
+#
+# This helper is for templates using GNU Makefiles.
+#
+do_build() {
+	if [ -z "$make_cmd" ]; then
+		make_cmd=make
+	fi
+	if [ -n "$XBPS_MAKEJOBS" -a -z "$disable_parallel_build" ]; then
+		makejobs="-j$XBPS_MAKEJOBS"
+	fi
+	${make_cmd} ${makejobs} ${make_build_args} ${make_build_target}
+}
+
+do_install() {
+	local target
+
+	if [ -z "$make_install_target" ]; then
+		target="DESTDIR=${DESTDIR} install"
+	else
+		target="${make_install_target}"
+	fi
+	if [ -z "$make_cmd" ]; then
+		make_cmd=make
+	fi
+	${make_cmd} ${make_install_args} ${target}
+}

xbps-src/helpers/perl-module.sh

@@ -4,17 +4,15 @@
 #
 # Required vars to be set by a template:
 #
-# 	build_style=perl_module
+# 	build_style=perl-module
 #
 # Optionally if the module needs more directories to be configured other
 # than $XBPS_BUILDDIR/$wrksrc, one can use (relative to $wrksrc):
 #
 #	perl_configure_dirs="blob/bob foo/blah"
 #
-
-perl_module_build()
-{
-	local perlmkf=
+do_configure() {
+	local perlmkf
 
 	if [ -z "$perl_configure_dirs" ]; then
 		perlmkf="$wrksrc/Makefile.PL"
@@ -41,3 +39,6 @@ perl_module_build()
 		fi
 	done
 }
+
+# Perl modules use standard make(1) to install.
+. ${XBPS_HELPERSDIR}/gnu-makefile.sh

xbps-src/helpers/python-module.sh

@@ -1,14 +1,11 @@
 #
 # This helper is for templates installing python modules.
 #
-
-do_build()
-{
+do_build() {
 	python setup.py build ${make_build_args}
 }
 
-do_install()
-{
+do_install() {
 	if [ -z "$make_install_args" ]; then
 		make_install_args="--prefix=/usr --root=$DESTDIR"
 	fi