listnewconfig: Add script

Mirrors 'make listnewconfig' in the C tools.

3 files changed, 47 insertions, 0 deletions

diff --git a/README.rst b/README.rst
index 10693c4..62189b0 100644
--- a/README.rst
+++ b/README.rst
@@ -70,6 +70,8 @@ executables. All but one mirror functionality available in the C tools.
 
 - `allyesconfig <https://github.com/ulfalizer/Kconfiglib/blob/master/allyesconfig.py>`_
 
+- `listnewconfig <https://github.com/ulfalizer/Kconfiglib/blob/master/listnewconfig.py>`_
+
 - `genconfig <https://github.com/ulfalizer/Kconfiglib/blob/master/genconfig.py>`_
 
 ``genconfig`` is intended to be run at build time. It generates a C header from
diff --git a/listnewconfig.py b/listnewconfig.py
new file mode 100755
index 0000000..bd35502
--- /dev/null
+++ b/listnewconfig.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2018, Ulf Magnusson
+# SPDX-License-Identifier: ISC
+
+# Works like 'make listnewconfig', listing all modifiable symbols that are not
+# assigned in the configuration file.
+#
+# The default output filename is '.config'. A different filename can be passed
+# in the KCONFIG_CONFIG environment variable.
+
+import sys
+
+from kconfiglib import standard_kconfig, BOOL, TRISTATE, INT, HEX, STRING, \
+                       TRI_TO_STR
+import kconfiglib
+
+def main():
+    kconf = standard_kconfig()
+    kconf.load_config()
+    for sym in kconf.unique_defined_syms:
+        # Only show symbols that can be toggled. Choice symbols are a special
+        # case in that sym.assignable will be (2,) (length 1) for visible
+        # symbols in choices in y mode, but they can still be toggled by
+        # selecting some other symbol.
+        if sym.user_value is None and \
+           (len(sym.assignable) > 1 or \
+            (sym.visibility and (sym.orig_type in (INT, HEX, STRING) or
+                                 sym.choice))):
+
+            # Don't reuse the 'config_string' format for bool/tristate symbols,
+            # to show n-valued symbols as 'CONFIG_FOO=n' instead of
+            # '# CONFIG_FOO is not set'. This matches the C tools.
+            if sym.orig_type in (BOOL, TRISTATE):
+                s = "{}{}={}\n".format(kconf.config_prefix, sym.name,
+                                       TRI_TO_STR[sym.tri_value])
+            else:
+                s = sym.config_string
+
+            sys.stdout.write(s)
+
+if __name__ == "__main__":
+    main()
diff --git a/setup.py b/setup.py
index dd7f0f1..3faa82c 100644
--- a/setup.py
+++ b/setup.py
@@ -33,6 +33,7 @@ setuptools.setup(
         "allnoconfig",
         "allmodconfig",
         "allyesconfig",
+        "listnewconfig",
     ),
 
     # TODO: Don't install the menuconfig on Python 2. It won't run there.
@@ -47,6 +48,7 @@ setuptools.setup(
             "allnoconfig = allnoconfig:main",
             "allmodconfig = allmodconfig:main",
             "allyesconfig = allyesconfig:main",
+            "listnewconfig = listnewconfig:main",
         )
     },