savedefconfig: Add script

Minimal configuration files can already be generated from within the
menuconfig too, but having a script available can be handy for
scripting.

3 files changed, 53 insertions, 1 deletions

diff --git a/README.rst b/README.rst
index 5ecae68..2063610 100644
--- a/README.rst
+++ b/README.rst
@@ -54,7 +54,8 @@ installed with e.g.
 Microsoft Windows is supported.
 
 The ``pip`` installation will give you both the base library and the following
-executables. All but two mirror functionality available in the C tools.
+executables. All but two (``genconfig`` and ``setconfig``) mirror functionality
+available in the C tools.
 
 - `menuconfig <https://github.com/ulfalizer/Kconfiglib/blob/master/menuconfig.py>`_
 
@@ -62,6 +63,8 @@ executables. All but two mirror functionality available in the C tools.
 
 - `olddefconfig <https://github.com/ulfalizer/Kconfiglib/blob/master/olddefconfig.py>`_
 
+- `savedefconfig <https://github.com/ulfalizer/Kconfiglib/blob/master/savedefconfig.py>`_
+
 - `alldefconfig <https://github.com/ulfalizer/Kconfiglib/blob/master/alldefconfig.py>`_
 
 - `allnoconfig <https://github.com/ulfalizer/Kconfiglib/blob/master/allnoconfig.py>`_
diff --git a/savedefconfig.py b/savedefconfig.py
new file mode 100755
index 0000000..19a403b
--- /dev/null
+++ b/savedefconfig.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2019, Ulf Magnusson
+# SPDX-License-Identifier: ISC
+
+import argparse
+
+import kconfiglib
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        description="""
+Saves a minimal configuration file that only lists symbols that differ in value
+their defaults. Loading such a configuration file is equivalent to loading the
+"full" configuration file.
+
+Minimal configuration files are handy to start from when editing configuration
+files by hand.
+
+The default input configuration file is '.config'. A different input filename
+can be passed in the KCONFIG_CONFIG environment variable.
+
+Note: Minimal configurations can also be generated from within the menuconfig
+interface.
+""")
+
+    parser.add_argument(
+        "--kconfig",
+        default="Kconfig",
+        help="Base Kconfig file (default: Kconfig)")
+
+    parser.add_argument(
+        "--out",
+        default="defconfig",
+        help="Output filename for minimal configuration (default: defconfig)")
+
+    args = parser.parse_args()
+
+    kconf = kconfiglib.Kconfig(args.kconfig)
+    kconf.load_config()
+    kconf.write_min_config(args.out)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/setup.py b/setup.py
index fd85c50..8400256 100644
--- a/setup.py
+++ b/setup.py
@@ -29,6 +29,7 @@ setuptools.setup(
         "genconfig",
         "oldconfig",
         "olddefconfig",
+        "savedefconfig",
         "alldefconfig",
         "allnoconfig",
         "allmodconfig",
@@ -45,6 +46,7 @@ setuptools.setup(
             "genconfig = genconfig:main",
             "oldconfig = oldconfig:_main",
             "olddefconfig = olddefconfig:main",
+            "savedefconfig = savedefconfig:main",
             "alldefconfig = alldefconfig:main",
             "allnoconfig = allnoconfig:main",
             "allmodconfig = allmodconfig:main",