Add `stream_in` and `stream_out` to fs.rs about quicli

[killercup]

Ah, I see! You want to have a command line flag for "file", if it's not set, read from stdin, i.e., what another program piped into yours? (And the same for output.)

This is something we can do! For input, you can use input_file: Option<String> flag. If it's None, you use std::io::stdin, otherwise you go with read_file.

We can totally abstract over this, but I'm not sure how to do this in a simple way: Instead of Strings, you really want to use "buffered readers", because then you can process the data as it comes it (instead of reading all of it into a String and then start working on the data).

For output, this is mostly the same, except you have to be really careful not to use println! for reporting anywere, otherwise that gets forwarded to the next tool in the pipe-chain.

[killercup]

Hm, can you be a bit more specific in how you want stream_in and stream_out to work? I guess you want stdin/stdout to read from/write to what other tools write/read, but I'm not sure of the interface you want to have :)

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Am 31.01.2018 um 20:44 schrieb Ricky ***@***.***>: I love the command line because of how easy it is to chain commands together (really the only other thing as easy are Rust iterators ;)). For example: head Sherlock_Complete_Works.txt | rg -w '^Sherlock | less Adding the stream_in and steam_out fs.rs functions with read_file and write_file would reallly compliment this library for CLIs. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or mute the thread.

[deg4uss3r]

I was thinking about this today and I think maybe creating a .or_stream() function that we can add to read_file/write_file if the path provided is a null error vice a file doesn't exist error?