Mark Nevill 14846fb743 all: rewrite the lexer to consume the entire input first ...

Previously we used the buffruneio package to buffer input. However,
the error handling was not good, and we would often panic when parsing
inputs.

SSH config files are generally not large, on the order of kilobytes or
megabytes, and it's fine to just read the entire thing into memory and
then parse from there. This also simplifies the parser significantly
and lets us remove a dependency and several defer calls.

Add a test that panicked with the old version and then modify the code
to ensure the test no longer panics.

Thanks to Mark Nevill (@devnev) for the initial error report and
failing test case.

Fixes #10.
Fixes #24.

2019-07-24 10:52:01 -10:00

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