Write GTFS files

[thomas-zahner]

Thank you for this crate! Reading GTFS files works flawlessly for my use-case. Currently I only see the possibility to read GTFS files. While the gtfs_structures::objects do implement Serialize this functionality does not seem to be used directly inside the crate. Wouldn't it make sense to implement gtfs_writer.rs akin to gtfs_reader.rs? I'm currently trying to implement the functionality outside the library with the help of gtfs_structures::objects::*.

[Tristramg]

Hello,

Indeed, we had writing in mind (hence the serialize trait), but we hadn’t have an actual usecase to use it.
We are open to contribution and would be very grateful, if you plan on implementing this.

[jbruechert]

I maintain https://crates.io/crates/gtfs-generator for this purpose, but I think the generic writing part would fit here too.
My crate has a bit of convenience code for producing GTFS from sources that do not contain coordinates which would definitely not belong here.