Major infrastructure changes, part 2.

* Moved helpers, common and triggers dirs into xbps-src, where
  they belong.
* Renamed the templates dir to srcpkgs, it was so redundant before.
* Make it possible to add subpkgs with no restriction in names, for
  example udev now has a subpkgs called "libgudev". Previously
  subpkgs were named "${sourcepkg}-${pkgname}".
* xbps-src: changed to look for template files in current directory.
  That means that most arguments from the targets have been removed.
* xbps-src: added a reinstall target, to remove + install.
* xbps-src: do not overwrite binpkgs by default, skip them.

And more that I forgot because it's a mega-commit that I've been
working for some days already...

--HG--
extra : convert_revision : 0f466878584d1e6895d2a234f07ea1b2d1e61b3e

xbps-src/helpers/replace-interpreter.sh

@@ -0,0 +1,46 @@
+#
+# This helper replaces shebang paths pointing to the correct ones
+# as used by xbps. Multiple languages are supported:
+#
+#	- GNU Bash
+#	- Perl
+#	- Python
+#
+
+bash_regexp=".*sh"
+perl_regexp=".*perl[^[:space:]]*"
+python_regexp=".*python[^[:space:]]*"
+
+replace_interpreter()
+{
+	local lang="$1"
+	local file="$2"
+	local trsb=
+	local orsb=
+
+	[ -z $lang -o -z $file ] && return 1
+
+	case $lang in
+	bash)
+		orsb=$bash_regexp
+		trpath="/bin/bash"
+		;;
+	perl)
+		orsb=$perl_regexp
+		trpath="/usr/bin/perl"
+		;;
+	python)
+		orsb=$python_regexp
+		trpath="/usr/bin/python"
+		;;
+	*)
+		;;
+	esac
+
+	if [ -f $file ]; then
+		sed -i -e "1s|^#![[:space:]]*${orsb}|#!${trpath}|" $file && \
+			msg_normal "Transformed $lang script: ${file##$wrksrc}."
+	else
+		msg_warn "Ignoring unexistent $lang script: ${file##$wrksrc}."
+	fi
+}