Compare sdk_config files

[lybrus]

Hi!

What is the easiest way to compare two sdk_config files? Some tools, etc. Why do I need it:

1. My idea is to use "$NRF_SDK/config/nrf52840/config/sdk_config.h" as base config and don't change it. All changed parameters ("diff") put into "app_config.h". Usually it's not a lot of changes compared to the base configuration, but if i need to see it in "modified" (compared to the base) sdk_config - it's very hard. Now I have projects with "modified" sdk_config files, I want to get "diff". 
2. It would be useful for sdk examples to see "diff".

I hope my explanation is understandable. Thanks for answers and suggestions in advance.

[Bruno Randolf]

Here is a Python script to show the difference between two sdk_config.h files:

import re
from argparse import ArgumentParser
from pprint import pprint

arg_parser = ArgumentParser(description="Nordic SDK sdk_config.h diff utility")
arg_parser.add_argument('-o', '--output', default="def")
arg_parser.add_argument('-i2', '--ignore2', action='store_true')
arg_parser.add_argument('file1')
arg_parser.add_argument('file2')
args = arg_parser.parse_args()

pattern = re.compile(r'\s?#define\s+(\w*)\s+(\w*)\s*')

def read_file(name):
	defs = {}
	file = open(name, "r")
	for line in file:
		match = pattern.match(line)
		if match:
			if match.group(1) == "SDK_CONFIG_H":
				continue
			defs[match.group(1)] = match.group(2)
	return defs

d1 = read_file(args.file1)
d2 = read_file(args.file2)

diff = {}

# find items in d1 which are different in d2, including non existent
for k, v1 in d1.items():
	v2 = d2.get(k)
	if v2 != v1:
		diff[k] = [v1, v2]

# find items which are in d2 but not d1
for k, v2 in d2.items():
	v1 = d1.get(k)
	if not v1:
		diff[k] = [v1, v2]

# output
if args.output == "pprint":
	pprint(diff)
elif args.output == "list":
	for k in sorted(diff):
		print(k, diff[k])
elif args.output == "def":
	for k in sorted(diff):
		if diff[k][0] and diff[k][1]:
			print("#define", k, diff[k][1], "// was:", diff[k][0])
		elif not diff[k][0]:
			print("#define", k, diff[k][1], "// not set in file 1")
		elif not diff[k][1] and diff[k][0] != "0":
			if not args.ignore2:
				print("#define", k, "0 // not set in file 2, was:", diff[k][0])