lazily compute VESION; write a pybindgen/version.py file in configure

pybindgen/wscript

@@ -4,6 +4,8 @@ def build(bld):
     
     obj = bld.create_obj('py')
     obj.find_sources_in_dirs('.')
+    # commented, triggers a WAF bug (Issue #40)
+    #obj.source.append('version.py')
     obj.inst_dir = 'pybindgen'
 
     obj = bld.create_obj('py')

wscript

@@ -3,6 +3,7 @@
 
 import Params
 from Params import fatal
+import Utils
 import os
 import pproc as subprocess
 import shutil
@@ -11,17 +12,18 @@ def get_version_from_bzr():
     import bzrlib.tag, bzrlib.branch
     branch = bzrlib.branch.Branch.open('file://' + os.getcwd())
     tags = bzrlib.tag.BasicTags(branch)
-    current_rev = branch.revision_history()[-1]
+    current_rev = branch.last_revision()
     for tag, revid in tags.get_tag_dict().iteritems():
         if revid == current_rev:
             return str(tag)
     return str("bzr_r%i" % (branch.revno(),))
 
 
-try:
-    VERSION = get_version_from_bzr()
-except ImportError:
-    VERSION = 'unknown'
+def get_version():
+    try:
+        return get_version_from_bzr()
+    except ImportError:
+        return 'unknown'
 
 APPNAME='pybindgen'
 srcdir = '.'
@@ -52,6 +54,27 @@ def configure(conf):
               "(Hint: if you do not have a debugging Python library installed"
               " try using the configure option '--debug-level release')")
 
+
+    ## Write a pybindgen/version.py file containing the project version
+    version = get_version()
+    version_lst = version.split('.')
+    configfile = 'pybindgen/version.py'
+    lst = Utils.split_path(configfile)
+    base = [conf.m_blddir, conf.env.variant()] + lst[:-1]
+    dir_ = Utils.join_path(*base)
+    try:
+            os.makedirs(dir_)
+    except OSError:
+        pass
+    fname = Utils.join_path(dir_, lst[-1])
+    dest = open(fname, 'w')
+    if len(version_lst) > 1:
+        dest.write('__version__ = (%s)\n' % (', '.join(version.split('.')),))
+    else:
+        dest.write('__version__ = "%s"\n' % (version,))
+    dest.close()
+
+
 def build(bld):
     if Params.g_commands['check']:
         bld.add_subdirs('tests')