python: Add a distutils build system

Add a template setup.py.in which will be used by the win32 Makefiles so that we
can generate the full setup.py which can be used to build the libxslt Python
bindings, if chosen to do so when configuring via 'cscript configure.js'.

python/Makefile.am

@@ -17,6 +17,7 @@
 	libxslt_wrap.h		\
 	libxsl.py		\
 	libxslt-python-api.xml	\
+	setup.py.in	\
 	$(DOCS)
 
 libxsltmod_la_LDFLAGS =  -module -avoid-version

python/setup.py.in

+#!/usr/bin/python -u
+#
+# Setup script for libxml2 and libxslt if found
+#
+import sys, os, subprocess
+
+try:
+    import setuptools
+except ImportError:
+    pass
+
+from distutils.core import setup, Extension
+
+# Below ROOT, we expect to find include, include/libxml2, lib and bin.
+# On *nix, it is not needed (but should not harm),
+# on Windows, it is set by configure.js.
+ROOT = r'@prefix@'
+
+# If this flag is set (windows only),
+# a private copy of the dlls are included in the package.
+# If this flag is not set, the libxml2 and libxslt
+# dlls must be found somewhere in the PATH at runtime.
+WITHDLLS = 1 and sys.platform.startswith('win')
+
+def missing(file):
+    if os.access(file, os.R_OK) == 0:
+        return 1
+    return 0
+
+try:
+    HOME = os.environ['HOME']
+except:
+    HOME="C:"
+
+if sys.platform.startswith('win'):
+    libraryPrefix = 'lib'
+    platformLibs = []
+else:
+    libraryPrefix = ''
+    platformLibs = ["m","z"]
+
+# those are examined to find
+# - libxslt/xsltconfig.h
+includes_dir = [
+"/usr/include",
+"/usr/local/include",
+"/opt/include",
+os.path.join(ROOT,'include'),
+HOME
+];
+
+# those are added in the linker search path for libraries
+libdirs = [
+os.path.join(ROOT,'lib'),
+]
+
+xslt_files = ["libxslt-api.xml", "libxslt-python-api.xml",
+             "libxslt.c", "libxsl.py", "libxslt_wrap.h",
+             "generator.py"]
+
+if WITHDLLS:
+    def altImport(s):
+        s = s.replace("import libxml2mod","from libxmlmods import libxml2mod")
+        s = s.replace("import libxsltmod","from libxsltmods import libxsltmod")
+        return s
+
+if missing("libxslt-py.c") or missing("libxslt.py"):
+    if missing("generator.py") or missing(os.path.join("..", "doc", "libxslt-api.xml")):
+        print("libxslt stub generator not found, libxslt not built")
+    else:
+        try:
+            subprocess.call([sys.executable,
+                            'generator.py',
+                            os.path.join('..', 'doc', 'libxslt-api.xml'),
+                            'libxslt-python-api.xml'
+                            ])
+        except:
+            print("failed to generate stubs for libxslt, aborting ...")
+            print(sys.exc_info()[0], sys.exc_info()[1])
+        else:
+            head = open("libxsl.py", "r")
+            generated = open("libxsltclass.py", "r")
+            result = open("libxslt.py", "w")
+            for line in head.readlines():
+                if WITHDLLS:
+                    result.write(altImport(line))
+                else:
+                    result.write(line)
+            for line in generated.readlines():
+                result.write(line)
+            head.close()
+            generated.close()
+            result.close()
+
+xml_includes=""
+for dir in includes_dir:
+    if not missing(dir + "/libxml2/libxml/tree.h"):
+        xml_includes=dir + "/libxml2"
+        break;
+
+if xml_includes == "":
+    print("failed to find headers for libxml2: update includes_dir")
+    sys.exit(1)
+
+xslt_includes=""
+for dir in includes_dir:
+    if not missing(dir + "/libxslt/xsltconfig.h"):
+        xslt_includes=dir + "/libxslt"
+        break;
+
+if xslt_includes == "":
+    print("failed to find headers for libxslt: update includes_dir")
+
+if WITHDLLS:
+    # libxslt dlls (expected in ROOT/bin)
+    dlls = ['libxslt.dll','libexslt.dll']
+
+    packaged_dlls = [os.path.join(ROOT,'bin',dll) for dll in dlls]
+
+    # create __init__.py for the libxsltmods package
+    if not os.path.exists("libxsltmods"):
+        os.mkdir("libxsltmods")
+        open("libxsltmods/__init__.py","w").close()
+
+    packaged_dlls = [os.path.join(ROOT,'bin',dll) for dll in dlls]
+
+descr = "libxslt package"
+modules = [ 'libxslt']
+if WITHDLLS:
+    modules.append('libxsltmods.__init__')
+c_files = []
+includes= [xslt_includes, xml_includes]
+libs    = platformLibs
+macros  = []
+
+descr = "libxslt package"
+if not sys.platform.startswith('win'):
+    #
+    # We are gonna build 2 identical shared libs with merge initializing
+    # both libxml2mod and libxsltmod
+    #
+    c_files = c_files + ['libxslt-py.c', 'libxslt.c']
+    xslt_c_files = c_files
+else:
+    #
+    # On windows the MERGED_MODULE option is not needed
+    # (and does not work)
+    #
+    xslt_c_files = ['libxslt-py.c', 'libxslt.c', 'types.c']
+libs.insert(0, libraryPrefix + 'exslt')
+libs.insert(0, libraryPrefix + 'xslt')
+libs.insert(0, libraryPrefix + 'xml2')
+includes.append(xslt_includes)
+
+
+extens=[Extension('libxsltmod', xslt_c_files, include_dirs=includes,
+                        library_dirs=libdirs,
+                        libraries=libs, define_macros=macros)]
+
+if missing("MANIFEST"):
+
+    manifest = open("MANIFEST", "w")
+    manifest.write("setup.py\n")
+    for file in xslt_files:
+        manifest.write(file + "\n")
+    manifest.close()
+
+if WITHDLLS:
+    ext_package = "libxsltmods"
+    if sys.version >= "2.2":
+        base = "lib/site-packages/"
+    else:
+        base = ""
+    data_files = [(base+"libxsltmods",packaged_dlls)]
+else:
+    ext_package = None
+    data_files = []
+
+setup (name = "libxslt-python",
+       # On *nix, the version number is created from setup.py.in
+       # On windows, it is set by configure.js
+       version = "@VERSION@",
+       description = descr,
+       author = "Daniel Veillard",
+       author_email = "veillard@redhat.com",
+       url = "https://gitlab.gnome.org/GNOME/libxslt",
+       licence="MIT Licence",
+       py_modules=modules,
+       ext_modules=extens,
+       ext_package=ext_package,
+       data_files=data_files,
+       )
+
+sys.exit(0)
+