`Result::expect()` was added in Rust 1.4. Using it tidies up the code,
and also helps by printing error details, eg, printing syntax error
details if a regex fails to compile. It adds a colon followed by the
`Debug` output from any error, making the periods in messages
unnecessary.
Fix up the checkstyle test so they pass. There is still an issue with
the content, but I think that is caused by a problem with how diffs are
being calculated presently.
Also from @marcusklaas:
Refactor code output functions
Specifically, `write_all_files` no longer returns a HashMap. It would sometimes
contain items, and sometimes be empty. When "fixed" newlines are required, this
must now be done with a separate call. The tests use this strategy and should now pass!
The code that manipulates paths to try and find files in the target dir
was not handling windows file seperators correctly. The code has been
updated to use the path module, and hopefully will play nicer across
operating systems.
Don't make a single line chain when it is was multi line in the source; allow overflow of the last chain element onto the next lines without breaking the chain.
