2021-12-23 Fred Gleason <fredg@paravelsystems.com>

* Added an 'AR_PYTHON_MODULE()' autoconf macro.
	* Added a test for the PyPI module build chain to 'configure.ac'.
	* Bumped the minimum Python version dependency from 3.4 to 3.6.

Signed-off-by: Fred Gleason <fredg@paravelsystems.com>

ChangeLog

@@ -22836,3 +22836,7 @@
 2021-12-23 Fred Gleason <fredg@paravelsystems.com>
 	* Refactored the build of the 'python3-rivwebpyapi' deb package
 	so as to include proper PyPI package metadata.
+2021-12-23 Fred Gleason <fredg@paravelsystems.com>
+	* Added an 'AR_PYTHON_MODULE()' autoconf macro.
+	* Added a test for the PyPI module build chain to 'configure.ac'.
+	* Bumped the minimum Python version dependency from 3.4 to 3.6.

INSTALL

@@ -50,7 +50,7 @@ OggVorbis - Open Source Audio Coding Library. Needed for OggVorbis
 importing and exporting. Included with most distros, or available at: 
 http://www.xiph.org/.
 
-Python, v3.4 or later
+Python, v3.6 or later
 Open source scripting language. Included with most distros, or available at:
 https://www.python.org/.
 
@@ -127,6 +127,9 @@ Available at http://www.underbit.com/products/mad/.
 TwoLAME - MPEG Layer 2 Encoder Library. Needed for MPEG Layer 2 exporting and
 capture. Available at http://www.twolame.org/.
 
+Python3 'build' and 'twine' modules. Needed to build DEB packages using
+the 'make deb' target. Available from the Python Packaging Index (PyPI).
+
 
 DOCUMENTATION
 -------------

acinclude.m4

@@ -2,7 +2,7 @@
 #
 # Local Autoconf macro definitions
 #
-#   (C) Copyright 2006-2019 Fred Gleason <fredg@paravelsystems.com>
+#   (C) Copyright 2006-2021 Fred Gleason <fredg@paravelsystems.com>
 #
 #   This program is free software; you can redistribute it and/or modify
 #   it under the terms of the GNU General Public License version 2 as
@@ -63,6 +63,38 @@ AC_DEFUN([AR_GET_DISTRO],[]
   ]
 )
 
+#
+# AR_PYTHON_MODULE(modname,[ACTION-IF-DETECTED],[ACTION-IF-NOT-DETECTED])
+#
+# Check for the existence of the {modname} python3 module.
+#
+# On successful detection, ACTION-IF-DETECTED is executed if present. If
+# the detection fails, then ACTION-IF-NOT-DETECTED is triggered.
+#
+# Based on code from the AX_PYTHON_MODULE() macro by Andrew Collier.
+#
+#   Copyright (c) 2008 Andrew Collier
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+#
+AC_DEFUN([AR_PYTHON_MODULE],[
+    PYTHON="python3"
+    PYTHON_NAME=`basename $PYTHON`
+    AC_MSG_CHECKING($PYTHON_NAME module: $1)
+    $PYTHON -c "import $1" 2>/dev/null
+    if test $? -eq 0;
+    then
+        AC_MSG_RESULT(yes)
+        $2
+    else
+        AC_MSG_RESULT(no)
+        $3
+    fi
+])
+
 # ===========================================================================
 #      https://www.gnu.org/software/autoconf-archive/ax_count_cpus.html
 # ===========================================================================

apis/rivwebpyapi/Makefile.am

@@ -23,7 +23,7 @@
 SUBDIRS = api\
           tests
 
-all:	pypi
+all:	@PYPI@
 
 pypi:	
 	rm -rf pypi

configure.ac

@@ -340,6 +340,22 @@ else
    AC_ARG_VAR(pyexecdir,[the Python extension modules directory])
 fi
 
+#
+# Check for PyPI Module Build Chain
+#
+AR_PYTHON_MODULE([build],[BUILD_FOUND=yes],[])
+AR_PYTHON_MODULE([twine],[TWINE_FOUND=yes],[])
+if test $BUILD_FOUND ; then
+  if test $TWINE_FOUND ; then
+    PYPI_FOUND=yes
+    AC_SUBST(PYPI,pypi)
+  else
+    AC_SUBST(PYPI,"")
+  fi
+else
+  AC_SUBST(PYPI,"")
+fi
+
 #
 # Check for FLAC
 #
@@ -718,6 +734,11 @@ AC_MSG_NOTICE("|                          Update I18N Data ... Yes       |")
 else
 AC_MSG_NOTICE("|                          Update I18N Data ... No        |")
 fi
+if test $PYPI_FOUND ; then
+AC_MSG_NOTICE("|          PyPI Module Build Chain Detected ... Yes       |")
+else
+AC_MSG_NOTICE("|          PyPI Module Build Chain Detected ... No        |")
+fi
 AC_MSG_NOTICE("|                                                         |")
 AC_MSG_NOTICE("| Configured Audio Drivers:                               |")
 if test -z $USING_ALSA ; then