Backport json emitter and stdin changes #5054
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# Conflicts: # src/bin/main.rs
* Fix some possible panics when using `--check` with stdin. One case which doesn't work is when there are only line ending fixes; with stdin rustfmt is unable to detect the difference as it stores the input with Unix line endings. * Add test for `rustfmt --check -l` with stdin.
* Fix newlines in JSON output This changes the JSON output to be more consistent about where newlines are included. Previously it only included them between lines in a multiline diff. That meant single line changes were treated a bit weirdly. This changes it to append a newline to every line. When feeding the results into `arc lint` this behaves correctly. I have only done limited testing though, in particular there's a possibility it might not work with files with `\r\n` endings (though that would have been the case before too). Fixes rust-lang#4259 * Update tests # Conflicts: # tests/writemode/target/output.json
# Conflicts: # src/config/file_lines.rs # src/rustfmt/main.rs # src/test/mod.rs
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I wanted to backport two changes to the json emitter, but to avoid conflicts I also pulled in the stdin stuff. So this PR backports
--checkwork when running from stdin. #3896There were only minor merge conflicts. Only the output.json in #4262 I had to recreate, since #3891 (which we won't backport) changed the file and it's all in a single line.
I also tried backporting #4225 but the code got restructured and there was no
self.filesto check for emptiness :(