souplesse/README.md

# Souplesse

_This readme describes what may someday be, not what is today_

Reads a GPX file which you generated by cycling around, and tells you
interesting(sic) things about it.

The principle we aspire to is that the measurement is subsidary to the
ride, not the purpose of the ride. The purpose of the ride is to enjoy
cycling, or to see new places, or to get from A to B, and the purpose
of Souplesse is to see if we can get any useful numbers out of the
riding you were doing anyway without making you do more of it.

So, the general idea is that given some ride data it can tell you how
long/how often you spent at a given level of effort (e.g. heart rate),
or output (power, speed, cadence, rate of ascent).

## Canned views

### ride view

graph of (selected variables) / time, with buttons to select variables
slider for threshold level
all points above threshold are highlighted and interval times above
 threshold shown
zoom in/out on time range
show the selected points on a map

### calendar view

note this will need some kind of server-side storage so that the
system remembers all your gpx files

shows dates that you rode
for each ride, show time at effort
some kind of slider for effort level


## Query view

Not yet decided if this is useful, something that allows graphs of
arbitrary functions of properties (e.g. to look at power/cadence
ratio, or ... some other weirdness)


# Tech notes

Use `nix-shell`. Inside the shell

* run tests with `cabal test --test-show-details=always`: if you don't
ask for details it won't tell you about incomplete pattern matches

* run the app with `cabal run`


----

_Do not look below this line_

## WIP, Puzzles and TODO

* do we even need Track? will it ever be anything more than a collection
 of Points?
* can we lose this "if isJust lat && isJust lon && isJust ts" wart?
* probably we should store points in a more efficient form than
 a singly-linked list

* need a web server in haskell that
 - accepts file upload and parses the gpx file
 - serves the data points in some format elm can digest easily
* need a database of some kind so the data can be saved
* and boring stuff like auth[zn]
* frontend can get data from backend
* for DX, backend can serve the js files needed by frontend
* we only have yesod-core, may need other parts as well
```
docker run -p 5432:5432 --name souplesse-postgres -e POSTGRES_USER=souplesse  -e POSTGRES_PASSWORD=secret -d postgres
nix-shell -p postgresql --run "psql -h localhost -U souplesse   -p 5432"
```