Tested on node 6.10.3
$ npm install
$ npm test
$ bin/fileSummary [--verbose] [--chars] [--encoding encoding] targetFile|-
--verbose causes all intermediate chunk summaries to be outputted
--chars causes characters to be counted instead of bytes
--encoding changes the input encoding from the default of utf8
targetFile is either a file path or - to indicate stdin
new SummaryTransformer(options)options additionally recognizes the key countChars to enable character counting mode. This will count characters in the input stream's encoding instead of bytes of raw data.
For each received string/buffer chunk, this transformer outputs an object that contains the elements
elapsed- ms since the stream openedlines- number of lines countedbytesorchars- number of elements counted, depending on mode
new SummaryReportTransformer(options)options does not recognize any extra keys.
Expects to receive objects outputted by SummaryTransformer
Does not output anything until the input stream is finished, at which point it outputs a one-line summary report containing the number of lines, bytes (or characters), elapsed time and throughput.
Does not support classic MacOS line endings (\r)
For some reason throughput is improved by 30% or so when piping from stdin (via cat) compared to being directly passed a file path.