solves #138 : implements a m4 macro to checks version

Now their is 2 macros :
 - PC_PYTHON_CHECK_MODULE_MATCH_VERSION(LIBRARY, VERSION, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND)
 - PC_PYTHON_CHECK_MODULE_VERSION(LIBRARY, MIN-VERSION, MAX-VERSION, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND)

configure.ac

@@ -37,30 +37,19 @@ PC_PYTHON_CHECK_MODULE([lxml], ,
 	AC_MSG_ERROR([Module lxml not found but mandatory for lodel2]))
 #Webui deps
 AC_SUBST([WEBUI], 'True')
-PC_PYTHON_CHECK_MODULE([jinja2], ,
+PC_PYTHON_CHECK_MODULE_VERSION([jinja2], [2.7.3], [], ,
 	AC_MSG_WARN([Module jinja2 not found but mandatory for default web interface])
 	AC_SUBST([WEBUI], 'False'))
-PC_PYTHON_CHECK_MODULE([werkzeug], ,
+PC_PYTHON_CHECK_MODULE_VERSION([werkzeug], [0.9], [], , 
 	AC_MSG_WARN([Module werkzeug not found but mandatory for default web interface])
 	AC_SUBST([WEBUI], 'False'))
 #Mongo datasource deps
 AC_SUBST([PYMONGO], 'True') #Can be found in lodel/buildconf.py
-PC_PYTHON_CHECK_MODULE([pymongo], ,
-	AC_MSG_WARN([Module pymongo not found. The mongodb datasource will not be able to work])
-	AC_SUBST([PYMONGO], 'False'))
-
-#
-#BEIGN
-#
-PC_PYTHON_CHECK_MODULE_VERSION([pymongo], [2.7.1], ,
+PC_PYTHON_CHECK_MODULE_VERSION([pymongo], [2.7], [2.8], ,
 	AC_MSG_WARN([Module pymongo not found. The mongodb datasource will not be able to work])
 	AC_SUBST([PYMONGO], 'False')
 )
 
-#
-# STOPE
-#
-
 #Documentation checks
 AC_SUBST([DOCOK], 'OK')
 AC_CHECK_PROGS([DOXYGEN], [doxygen])

m4/python_pyconfigure.m4

@@ -648,11 +648,11 @@ m4_ifnblank([$1], [
 AS_IF([test "$[pc_cv_python_func_]pc_python_safe_mod[_$2]" = "no"], [$5], [$4])
 ])# PC_PYTHON_CHECK_FUNC
 
-# PC_PYTHON_CHECK_MODULE_VERSION(LIBRARY, VERSION, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND)
+# PC_PYTHON_CHECK_MODULE_MATCH_VERSION(LIBRARY, VERSION, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND)
 # -------------------------------------------------
 # Macro for checking if a Python library with this version is installed
 #
-AC_DEFUN([PC_PYTHON_CHECK_MODULE_VERSION],
+AC_DEFUN([PC_PYTHON_CHECK_MODULE_MATCH_VERSION],
 [AC_REQUIRE([PC_PROG_PYTHON])[]dnl
 m4_define([pc_python_safe_mod], m4_bpatsubsts($1, [\.], [_]))
 AC_CACHE_CHECK([for Python '$1' library version '$2'],
@@ -687,3 +687,69 @@ AS_IF([test "x$[pc_cv_python_module_version]pc_python_safe_mod" = "x$2" ],
 		[$4]
 	])
 ])# PC_PYTHON_CHECK_MODULE_VERSION
+
+
+# PC_PYTHON_CHECK_MODULE_VERSION(LIBRARY, MIN-VERSION, MAX-VERSION, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND)
+# -------------------------------------------------
+# Macro for checking if a Python library with this version is installed
+#
+AC_DEFUN([PC_PYTHON_CHECK_MODULE_VERSION],
+[AC_REQUIRE([PC_PROG_PYTHON])[]dnl
+m4_define([pc_python_safe_mod], m4_bpatsubsts($1, [\.], [_]))
+m4_append([pc_python_safe_mod], m4_bpatsubsts($2, [\.], [_]))
+m4_append([pc_python_safe_mod], m4_bpatsubsts($3, [\.], [_]))
+AC_CACHE_CHECK(
+    [for Python '$1' library m4_ifnblank([$2],['$2' <= ]) version m4_ifnblank([$3], [<= '$3'])],
+    [[pc_cv_python_module_version]pc_python_safe_mod],
+    [AC_LANG_PUSH(Python)[]dnl
+     AC_LINK_IFELSE(
+	[AC_LANG_PROGRAM([dnl
+import sys
+def cmp_vers(v1,v2):
+    v1 = v1.split('.')
+    v2 = v2.split('.')
+    for i in range(max([len](v1), [len](v2))):
+        v1v = int(v1[[i]] if i < [len](v1) else 0)
+        v2v = int(v2[[i]] if i < [len](v2) else 0)
+        if v1v > v2v:
+            return 1
+        if v1v < v2v:
+            return -1
+    return 0
+try:
+    import $1
+except:
+    result='not found'
+else:
+    result='yes'
+    vmin = '$2'
+    vmax = '$3'
+    for vers_attr in ('__version__', 'version', 'version_info'):
+        if hasattr($1, vers_attr):
+            version = getattr($1, vers_attr)
+            break
+    else:
+        result = 'unknown'
+    if version not in ('unknonwn', 'no'):
+        failmsg = "but "+ version + " found"
+        if [len](vmin) > 0:
+            if cmp_vers(version, vmin) < 0:
+                result = failmsg
+        if [len](vmax) > 0:
+            if cmp_vers(version, vmax) > 0:
+                result = failmsg
+
+sys.stdout.write(result)
+], [])], 
+	[[pc_cv_python_module_version]pc_python_safe_mod=`./conftest`],
+	[AC_MSG_FAILURE([failed to run Python program])])
+	AC_LANG_POP(Python)[]dnl
+	])
+AS_IF(	[test "$[pc_cv_python_module_version]pc_python_safe_mod" = "yes"],
+	[$4],
+	[	AS_IF(
+			[test "x$[pc_cv_python_module_version]pc_python_safe_mod" = 'unknown'],
+			AC_MSG_WARN([Unable to fetch version of Python module $1]))
+		[$5]
+	])
+])# PC_PYTHON_CHECK_MODULE_VERSION