rust-config: fix incorrect coercion of null values to false
As explained in the previous changeset:
Probably being too trigger happy about boolean values, I incorrectly set
the transform for a `None` to a `Some(false)`. It would cause for example
the `ui.formatted` value to be set to `Some(false)`, which turns off the colors
among other things, when `None` would trigger the automatic behavior.
#!/usr/bin/env python3
# Filter output by pyflakes to control which warnings we check
import re
import sys
lines = []
for line in sys.stdin:
# We blacklist tests that are too noisy for us
pats = [
r"undefined name 'WindowsError'",
r"redefinition of unused '[^']+' from line",
# for cffi, allow re-exports from pure.*
r"cffi/[^:]*:.*\bimport \*' used",
r"cffi/[^:]*:.*\*' imported but unused",
]
keep = True
for pat in pats:
if re.search(pat, line):
keep = False
break # pattern matches
if keep:
fn = line.split(':', 1)[0]
with open(fn, 'rb') as f:
data = f.read()
if b'no-' b'check-code' in data:
continue
lines.append(line)
for line in lines:
sys.stdout.write(line)
print()