# Some notes:
#
# - '[ .. ]' is an alternative notation for a function call combined with
#   a dictionary. It augments the f()-syntax in imperative languages.
# - A call to a function that accepts something of type 'Interpolation' is
#   parsed differently than other calls (if feasible).
# - A period ('.') is used to start a new block. It replaces the 'do'-keyword
#   in Haskell.
#
# Issues:
# 
# - The period is frequently used to perform function composition. In our
#   language, it is possible to do so, but then it must happen on the same
#   line.
# - What is the meaning of adding a period to a reference to
#   a function? Does it simply call the function with a list? Can we generalise
#   this to monoids? Can monads (which are derived from monoids) work with the
#   same mechanism?
# - How should longer pieces of text be declared? How does interpolation work?

import "web/html" (Html, render)

struct Task.
  description : String
  created_at : Date
  updated_at : Date
  done : Bool

let item : Task -> Html
let item task.
  render.
    div.
      checkbox[checked: task.done, title: "Check this box if you're done with this to-do item."]
      p task.description
      date $ Date.format task.created_at

let app.
  let tasks = fetch_tasks
  render.
    div[style: { display: "flex", flex_direction: "column" }].
      map item tasks
      button "Add item!"