Index: tkdeploader.py
===================================================================
--- tkdeploader.py	(revision 0)
+++ tkdeploader.py	(revision 0)
@@ -0,0 +1,71 @@
+import os
+
+def basic_preloader(master, package=None, version=None, exact=False,
+        env_var=None):
+    """A basic preloader that adds a custom path to the list of
+    directories that Tcl uses when attempting to resolve packages with
+    the package command.
+
+    The custom path is taken from the environment variable specified in
+    env_var, the other parameters received (package, version and exact)
+    are never used here.
+    """
+    dep_path = os.environ.get(env_var)
+    if dep_path:
+        master.tk.eval(
+                'global auto_path; '
+                'lappend auto_path {%s}' % dep_path)
+
+
+class DependenceLoader(dict):
+
+    def remove(self, package):
+        """Remove package so it will no longer be loaded when a Tcl
+        interpreter is created."""
+        del self[package]
+
+
+    def add(self, package, preloader=None, version=None, exact=False,
+            **kwargs):
+        """Indicate that package must be loaded after the Tcl interpreter
+        is created. Adding the same package twice replaces the older.
+
+        If preloader is specified it must be callable and should expect
+        to be invoked with a Tkinter.Tk instance, package, version, exact,
+        and any extra kwargs passed.
+
+        If version is specified, and exact is True, then only the specific
+        package version will be accepted. Defining only version allows
+        Tcl to load newer versions of the package as long as the major
+        number is the same. If neither version nor exact are given then
+        any version of the package is acceptable for loading.
+        Remember to use a string when specifying version, like '1.2.3'.
+        """
+        if preloader is not None and not hasattr(preloader, '__call__'):
+            raise TypeError('loader must be callable')
+
+        self[package] = {
+                'preloader': preloader, 'preloader_kw': kwargs,
+                'version': version,
+                'exact': exact}
+
+
+    def load_now(self, master):
+        """Load all the added packages."""
+        for pkg, opts in self.iteritems():
+            version, exact = opts['version'], opts['exact']
+
+            if opts['preloader'] is not None:
+                opts['preloader'](
+                        master, pkg, version, exact, **opts['preloader_kw'])
+
+            args = ()
+            if exact:
+                args += ('-exact', )
+            args += (pkg, version)
+
+            # TclError may be raised now
+            master.tk.call('package', 'require', *args)
+
+
+dependences = DependenceLoader()

Property changes on: tkdeploader.py
___________________________________________________________________
Added: svn:mergeinfo