Have load_config() and write_(min_)config() return messages

Hardcoding load_config() and write_(min_)config() to write any message
to stdout is awkward, because it means that the message can't be easily
reused when stdout is the wrong place to write it to (e.g. in
menuconfig/guiconfig). This gets extra bad now that there's also the "No
change to ..." message.

Modify load_config() and write_(min_)config() to return the message as a
string instead, and have them always return a message, instead of just
when 'filename' is None and verbose=True. This makes things flexible and
straightforward.

Use the new behavior in menuconfig.py and guiconfig.py. They now show
"No change to ..." when saving a file doesn't modify it.

Tools that want to write messages to stdout should now do
print(kconf.load_config()) / print(kconf.write_config()).

There's no clean way to preserve perfect backwards compatibility here,
but keep accepting the 'verbose' argument and print a deprecation
warning if a value is ever passed for it. That way, scripts will keep
running, though possibly with less output on stdout.

This changes the meaning of the load_config() return value as well,
though I suspect it was only ever used by the menuconfig/guiconfig
interfaces.

The new behavior applies for kconfiglib.VERSION >= (12, 0, 0).

1 files changed, 3 insertions, 1 deletions

diff --git a/listnewconfig.py b/listnewconfig.py
index 06d0cf1..59de141 100755
--- a/listnewconfig.py
+++ b/listnewconfig.py
@@ -18,7 +18,9 @@ from kconfiglib import standard_kconfig, BOOL, TRISTATE, INT, HEX, STRING, \
 
 def main():
     kconf = standard_kconfig()
-    kconf.load_config()
+    # Make it possible to filter this message out
+    sys.stderr.write(kconf.load_config() + "\n")
+
     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