[gentoo-python] [PATCH python-utils-r1 1/2] Introduce 'PYTHON_PKG_DEP' for dependency on Python.

[Michał Górny]

The function gives a complete dependency string on a particular Python
interpreter version, e.g.:

dev-lang/python:2.7[ncurses]
---
 gx86/eclass/python-utils-r1.eclass | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/gx86/eclass/python-utils-r1.eclass b/gx86/eclass/python-utils-r1.eclass
index 0f342b7..cad4bdc 100644
--- a/gx86/eclass/python-utils-r1.eclass
+++ b/gx86/eclass/python-utils-r1.eclass
@@ -83,6 +83,17 @@ _PYTHON_ALL_IMPLS=(
 # /usr/lib64/python2.6/site-packages
 # @CODE
 
+# @ECLASS-VARIABLE: PYTHON_PKG_DEP
+# @DESCRIPTION:
+# The complete dependency on a particular Python package as a string.
+#
+# Set and exported on request using python_export().
+#
+# Example value:
+# @CODE
+# dev-lang/python:2.7[xml]
+# @CODE
+
 # @FUNCTION: python_export
 # @USAGE: [<impl>] <variables>...
 # @DESCRIPTION:
@@ -150,6 +161,30 @@ python_export() {
 				export PYTHON_SITEDIR=${EPREFIX}${dir}/site-packages
 				debug-print "${FUNCNAME}: PYTHON_SITEDIR = ${PYTHON_SITEDIR}"
 				;;
+			PYTHON_PKG_DEP)
+				local d
+				case ${impl} in
+					python*)
+						PYTHON_PKG_DEP='dev-lang/python';;
+					jython*)
+						PYTHON_PKG_DEP='dev-java/jython';;
+					pypy*)
+						PYTHON_PKG_DEP='dev-python/pypy';;
+					*)
+						die "Invalid implementation: ${impl}"
+				esac
+
+				# slot
+				PYTHON_PKG_DEP+=:${impl##*[a-z-]}
+
+				# use-dep
+				if [[ ${PYTHON_REQ_USE} ]]; then
+					PYTHON_PKG_DEP+=[${PYTHON_REQ_USE}]
+				fi
+
+				export PYTHON_PKG_DEP
+				debug-print "${FUNCNAME}: PYTHON_PKG_DEP = ${PYTHON_PKG_DEP}"
+				;;
 			*)
 				die "python_export: unknown variable ${var}"
 		esac
-- 
1.8.0.2