This is an experimental project in full-stack Haskell, using the Miso framework for the UI.
This consumes and displays data files in the GTFS format. This format ultimately comes down to zip file containing a set of an RFC 4180 comma-separated values (CSV) files with known names and formats.
See BUILDING.md. Note that getting GHCJS set up can be a little bit hairy, and doubly so when you need both a plain GHC and GHCJS in the same environment.
Find a GTFS feed from your favorite transit agency. For example, the Massachusetts Bay Transportation Authority (Boston, MA, USA: "The T") has published GTFS data. Google's GTFS documentation has links to lists of GTFS data as well. Download, and do not unpack, the GTFS zip file.
Now run:
stack --stack-yaml server/stack.yaml exec -- \
server -p 3003 -g MBTA_GTFS.zip-p gives the port number to listen on, and defaults to 3003. -g
gives the path to the GTFS zip file and is required.
Open a browser at http://localhost:3003/ and enjoy.
As mentioned initially, this is mostly intended as an experiment and launching pad to see if I can build an interactive Web application without using React/Redux and the corresponding mish-mash of JavaScript tools. (To which the answer seems to be, yes, but getting the build chain installed is tricky, but if you ever looked under the hood of your yarn/npm/babel/Flow/JSX stack then GHCJS is definitely less alarming.)
As of this writing TellMeT only displays a simple route list fetched via a REST API. An obvious next step is to get it to display actual schedules: the data is already there and just needs to be parsed and served.
I have ambitions of also making this consume GTFS-Realtime Protobuf data, though that's much further out, and as a spare-time project this may not get there.