Artix Linux Forum

#!/bin/env python3
if __name__=='__main__':
	import sys, os
	maxw = int(os.environ.get('CONFIG_DIFF_MAXW','30'))
	missing = int(os.environ.get('CONFIG_DIFF_MISSING','0'))
	prog = os.path.basename(sys.argv[0])
	stderr = sys.stderr
	if len(sys.argv)!=3:
		print(f'!!!!! {prog}: usage {prog} config1 config2',file=stderr)
		sys.exit(1)
	def getconfigs(fn):
		configs = {}
		bfn = os.path.basename(fn)
		with open(fn,'r') as f:
			L = f.readlines()
			for i,line in enumerate(L):
				line = line.strip()
				if 'CONFIG_' not in line: continue
				if line.startswith('#'):
					if not missing: continue
					line = line[1:].strip()
					if 'is not set' in line:
						name = line.split()[0]
						value = 'missing' if missing else 'is not set'
					else:
						print(f'!!!!! {prog}:{bfn}:{i} unhandled comment: {L[i]}',file=stderr)
						continue
				else:
					neq = line.count('=')
					if neq!=1:
						if '="' not in line or not line.endswith('"'):
							error = 'multiple assignment' if neq else 'missing assignment'
							print(f'!!!!! {prog}:{bfn}:{i} {error}: {L[i]}',file=stderr)
							continue
						
					name, value = line.split('=',1)
				configs[name.strip()] = value.strip()
		return bfn, configs

	bfn1, configs1 = getconfigs(sys.argv[1])
	bfn2, configs2 = getconfigs(sys.argv[2])

	if configs1!=configs2:
		rows = [('Name', bfn1, bfn2)]
		N = set(configs1.keys()).union(configs2.keys())
		W = list(map(len,rows[0]))
		for name in sorted(N):
			value1 = configs1[name] if name in configs1 else 'missing'
			value2 = configs2[name] if name in configs2 else 'missing'
			if value1!=value2:
				row = (name,value1,value2)
				for i in range(3):
					W[i] = max(W[i],len(row[i]))
				rows.append(row)
		W = (min(W[0],50),)+tuple((min(maxw,_) for _ in W[1:]))
		fmt0 = '%%-%ds %%%ds %%%ds' % W
		fmt1 = '%%%ds %%-%ds %%-%ds' % W

		def colSplit(s,w):
			while len(s)>w:
				yield s[:w]
				s = s[w:]
			yield s

		for row in rows:
			row = [tuple(colSplit(r,w)) for r,w in zip(row,W)]
			n = max((len(r) for r in row))
			fmt = fmt0
			for i in range(n):
				cols = tuple((r[i] if i<len(r) else '' for r in row))
				#print(f'{n=} {i=} {row=} {cols=}')
				print(fmt % cols)
				fmt = fmt1