1 files changed, 93 insertions, 0 deletions
diff --git a/debian/lib/python/debian_linux/kconfig.py b/debian/lib/python/debian_linux/kconfig.py
new file mode 100644
index 000000000..73d491d7f
--- /dev/null
+++ b/debian/lib/python/debian_linux/kconfig.py
@@ -0,0 +1,93 @@
+from collections import OrderedDict
+
+__all__ = (
+    "KconfigFile",
+)
+
+
+class KConfigEntry(object):
+    __slots__ = 'name', 'value', 'comments'
+
+    def __init__(self, name, value, comments=None):
+        self.name, self.value = name, value
+        self.comments = comments or []
+
+    def __eq__(self, other):
+        return self.name == other.name and self.value == other.value
+
+    def __hash__(self):
+        return hash(self.name) | hash(self.value)
+
+    def __repr__(self):
+        return ('<{}({!r}, {!r}, {!r})>'
+                .format(self.__class__.__name__, self.name, self.value,
+                        self.comments))
+
+    def __str__(self):
+        return 'CONFIG_{}={}'.format(self.name, self.value)
+
+    def write(self):
+        for comment in self.comments:
+            yield '#. ' + comment
+        yield str(self)
+
+
+class KConfigEntryTristate(KConfigEntry):
+    __slots__ = ()
+
+    VALUE_NO = False
+    VALUE_YES = True
+    VALUE_MOD = object()
+
+    def __init__(self, name, value, comments=None):
+        if value == 'n' or value is None:
+            value = self.VALUE_NO
+        elif value == 'y':
+            value = self.VALUE_YES
+        elif value == 'm':
+            value = self.VALUE_MOD
+        else:
+            raise NotImplementedError
+        super(KConfigEntryTristate, self).__init__(name, value, comments)
+
+    def __str__(self):
+        if self.value is self.VALUE_MOD:
+            return 'CONFIG_{}=m'.format(self.name)
+        if self.value:
+            return 'CONFIG_{}=y'.format(self.name)
+        return '# CONFIG_{} is not set'.format(self.name)
+
+
+class KconfigFile(OrderedDict):
+    def __str__(self):
+        ret = []
+        for i in self.str_iter():
+            ret.append(i)
+        return '\n'.join(ret) + '\n'
+
+    def read(self, f):
+        for line in iter(f.readlines()):
+            line = line.strip()
+            if line.startswith("CONFIG_"):
+                i = line.find('=')
+                option = line[7:i]
+                value = line[i + 1:]
+                self.set(option, value)
+            elif line.startswith("# CONFIG_"):
+                option = line[9:-11]
+                self.set(option, 'n')
+            elif line.startswith("#") or not line:
+                pass
+            else:
+                raise RuntimeError("Can't recognize %s" % line)
+
+    def set(self, key, value):
+        if value in ('y', 'm', 'n'):
+            entry = KConfigEntryTristate(key, value)
+        else:
+            entry = KConfigEntry(key, value)
+        self[key] = entry
+
+    def str_iter(self):
+        for key, value in self.items():
+            yield str(value)