CPP: New query for similarly named variables.

[geoffw0]

This query comes from an idea that popped into my head while I was on holiday.

I haven't written tags, qldoc, tests or a change note for it yet - I'd prefer to solicit some feedback on whether we think this query is worthwhile first.

Typical results are variables called:

gl
g1

I
l

I062_080_MD5
I062_080_MDS

mode1
model

[ghost]

All committers have signed the CLA.

[jbj]

Nice idea. I'm running the query on 41 projects here: https://lgtm.com/query/1506524156925/

[jbj]

Does anyone see a genuine bug among the results? I think there should be a few good results before it makes sense to include this query by default. Maybe the same idea is better applied to JavaScript/Python or to string literals.

[geoffw0]

On string literals it doesn't produce interesting results, even with short strings filtered out:

"cppcheck: argument to '-I' is missing."
"cppcheck: argument to '-l' is missing."

"Ctrl+O"
"Ctrl+0"

"KEYCODE_I"
"KEYCODE_1"

"11.bin"
"1l.bin" --- these occur in what appears to be generated or reverse-engineered code

I'm not set up to try out the query on JavaScript or Python. Mentioning @xiemaisi and I'll ping Mark in case they think it's worth a try.

[geoffw0]

Nothing interesting turned up on Python: https://lgtm.com/query/1506522147600/

[geoffw0]

Closing due to little interest.