From 01f8d59474ed7614812ad0bed72ce9f24d6df72a Mon Sep 17 00:00:00 2001
From: Anthony Towns <aj@azure.humbug.org.au>
Date: Fri, 21 Mar 2008 13:57:15 +0000
Subject: [PATCH] daklib/extensions.py, dak/dak.py,
 config/debian/extensions.py: move generic extension helpers into
 daklib.extensions

---
 config/debian/extensions.py | 28 ++---------------
 dak/dak.py                  |  4 ++-
 daklib/extensions.py        | 61 +++++++++++++++++++++++++++++++++++++
 3 files changed, 66 insertions(+), 27 deletions(-)
 create mode 100644 daklib/extensions.py

diff --git a/config/debian/extensions.py b/config/debian/extensions.py
index d586d4d0..9d6bef1c 100644
--- a/config/debian/extensions.py
+++ b/config/debian/extensions.py
@@ -1,21 +1,7 @@
 import sys, os
 
-# This function and its data should move into daklib/extensions.py
-# or something.
-replaced_funcs = {}
-replace_funcs = {}
-def replace_dak_function(module,name):
-    def x(f):
-        def myfunc(*a,**kw):
-	    global replaced_funcs
-            f(replaced_funcs[name], *a, **kw)
-	myfunc.__name__ = f.__name__
-	myfunc.__doc__ = f.__doc__
-	myfunc.__dict__.update(f.__dict__)
-
-        replace_funcs["%s:%s" % (module,name)] = myfunc
-	return f
-    return x
+import daklib.extensions
+from daklib.extensions import replace_dak_function
 
 @replace_dak_function("process-unchecked", "check_signed_by_key")
 def check_signed_by_key(oldfn):
@@ -35,14 +21,4 @@ def check_signed_by_key(oldfn):
 
     oldfn()
 
-def init(name):
-    global replaced_funcs
-
-    # This bit should be done automatically too
-    replaced_funcs = {}
-    for f,newfunc in replace_funcs.iteritems():
-        m,f = f.split(":",1)
-        if len(f) > 0 and m == name:
-	    replaced_funcs[f] = dak_module.__dict__[f]
-	    dak_module.__dict__[f] = newfunc
 
diff --git a/dak/dak.py b/dak/dak.py
index 10da0411..2e4bd820 100755
--- a/dak/dak.py
+++ b/dak/dak.py
@@ -29,7 +29,7 @@
 ################################################################################
 
 import sys, imp
-import daklib.utils
+import daklib.utils, daklib.extensions
 
 ################################################################################
 
@@ -209,6 +209,8 @@ def main():
 
     module.dak_userext = userext
     userext.dak_module = module
+
+    daklib.extensions.init(cmdname, module, userext)
     if userext.init is not None: userext.init(cmdname)
 
     module.main()
diff --git a/daklib/extensions.py b/daklib/extensions.py
new file mode 100644
index 00000000..d5da89d8
--- /dev/null
+++ b/daklib/extensions.py
@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+
+# Utility functions for extensions
+# Copyright (C) 2008 Anthony Towns <ajt@dbeian.org>
+
+################################################################################
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+################################################################################
+
+dak_functions_to_replace = {}
+dak_replaced_functions = {}
+
+def replace_dak_function(module,name):
+    """Decorator to make a function replace a standard dak function
+       in a given module. The replaced function will be provided as
+       the first argument."""
+
+    def x(f):
+        def myfunc(*a,**kw):
+            global replaced_funcs
+            f(dak_replaced_functions[name], *a, **kw)
+        myfunc.__name__ = f.__name__
+        myfunc.__doc__ = f.__doc__
+        myfunc.__dict__.update(f.__dict__)
+
+	fnname = "%s:%s" % (module, name)
+	if fnname in dak_functions_to_replace:
+	    raise Exception, \
+		"%s in %s already marked to be replaced" % (name, module)
+        dak_functions_to_replace["%s:%s" % (module,name)] = myfunc
+        return f
+    return x
+
+################################################################################
+
+def init(name, module, userext):
+    global dak_replaced_functions
+
+    # This bit should be done automatically too
+    dak_replaced_functions = {}
+    for f,newfunc in dak_functions_to_replace.iteritems():
+        m,f = f.split(":",1)
+        if len(f) > 0 and m == name:
+            dak_replaced_functions[f] = module.__dict__[f]
+            module.__dict__[f] = newfunc
+
+
-- 
2.39.5