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Steve Dunham
2026-04-03 20:36:40 -07:00
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public/app.js
public/dist

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# Newt "Spruce" framework • [TodoMVC](http://todomvc.com)
## Implementation
An implementation of TodoMVC, using the official CSS and DOM structure. I threw together an Elm-like framework that I'm calling "spruce" for now. It's lacking features, but works.
I don't have a good story for javascript imports yet, so I'm embedding the DOM patcher in [Spruce.newt](../src/Web/Spruce.newt).
## Dev
If you background vite, you can rerun the newt command and reload the browser. Hot reload is not implemented.
```
newt src/Todo.newt -o public/app.js
vite public
```
## Build
```
newt src/Todo.newt -o public/app.js
vite build --minify public
```

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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Newt • TodoMVC</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="main"></div>
<script src="app.js" type=module></script>
</body>
</html>

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@charset 'utf-8';
html,
body {
margin: 0;
padding: 0;
}
button {
margin: 0;
padding: 0;
border: 0;
background: none;
font-size: 100%;
vertical-align: baseline;
font-family: inherit;
font-weight: inherit;
color: inherit;
-webkit-appearance: none;
appearance: none;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
body {
font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
line-height: 1.4em;
background: #f5f5f5;
color: #111111;
min-width: 230px;
max-width: 550px;
margin: 0 auto;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
font-weight: 300;
}
.hidden {
display: none;
}
.todoapp {
background: #fff;
margin: 130px 0 40px 0;
position: relative;
box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2),
0 25px 50px 0 rgba(0, 0, 0, 0.1);
}
.todoapp input::-webkit-input-placeholder {
font-style: italic;
font-weight: 400;
color: rgba(0, 0, 0, 0.4);
}
.todoapp input::-moz-placeholder {
font-style: italic;
font-weight: 400;
color: rgba(0, 0, 0, 0.4);
}
.todoapp input::input-placeholder {
font-style: italic;
font-weight: 400;
color: rgba(0, 0, 0, 0.4);
}
.todoapp h1 {
position: absolute;
top: -140px;
width: 100%;
font-size: 80px;
font-weight: 200;
text-align: center;
color: #b83f45;
-webkit-text-rendering: optimizeLegibility;
-moz-text-rendering: optimizeLegibility;
text-rendering: optimizeLegibility;
}
.new-todo,
.edit {
position: relative;
margin: 0;
width: 100%;
font-size: 24px;
font-family: inherit;
font-weight: inherit;
line-height: 1.4em;
color: inherit;
padding: 6px;
border: 1px solid #999;
box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
box-sizing: border-box;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
.new-todo {
padding: 16px 16px 16px 60px;
height: 65px;
border: none;
background: rgba(0, 0, 0, 0.003);
box-shadow: inset 0 -2px 1px rgba(0,0,0,0.03);
}
.main {
position: relative;
z-index: 2;
border-top: 1px solid #e6e6e6;
}
.toggle-all {
width: 1px;
height: 1px;
border: none; /* Mobile Safari */
opacity: 0;
position: absolute;
right: 100%;
bottom: 100%;
}
.toggle-all + label {
display: flex;
align-items: center;
justify-content: center;
width: 45px;
height: 65px;
font-size: 0;
position: absolute;
top: -65px;
left: -0;
}
.toggle-all + label:before {
content: '❯';
display: inline-block;
font-size: 22px;
color: #949494;
padding: 10px 27px 10px 27px;
-webkit-transform: rotate(90deg);
transform: rotate(90deg);
}
.toggle-all:checked + label:before {
color: #484848;
}
.todo-list {
margin: 0;
padding: 0;
list-style: none;
}
.todo-list li {
position: relative;
font-size: 24px;
border-bottom: 1px solid #ededed;
}
.todo-list li:last-child {
border-bottom: none;
}
.todo-list li.editing {
border-bottom: none;
padding: 0;
}
.todo-list li.editing .edit {
display: block;
width: calc(100% - 43px);
padding: 12px 16px;
margin: 0 0 0 43px;
}
.todo-list li.editing .view {
display: none;
}
.todo-list li .toggle {
text-align: center;
width: 40px;
/* auto, since non-WebKit browsers doesn't support input styling */
height: auto;
position: absolute;
top: 0;
bottom: 0;
margin: auto 0;
border: none; /* Mobile Safari */
-webkit-appearance: none;
appearance: none;
}
.todo-list li .toggle {
opacity: 0;
}
.todo-list li .toggle + label {
/*
Firefox requires `#` to be escaped - https://bugzilla.mozilla.org/show_bug.cgi?id=922433
IE and Edge requires *everything* to be escaped to render, so we do that instead of just the `#` - https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7157459/
*/
background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23949494%22%20stroke-width%3D%223%22/%3E%3C/svg%3E');
background-repeat: no-repeat;
background-position: center left;
}
.todo-list li .toggle:checked + label {
background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%2359A193%22%20stroke-width%3D%223%22%2F%3E%3Cpath%20fill%3D%22%233EA390%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22%2F%3E%3C%2Fsvg%3E');
}
.todo-list li label {
overflow-wrap: break-word;
padding: 15px 15px 15px 60px;
display: block;
line-height: 1.2;
transition: color 0.4s;
font-weight: 400;
color: #484848;
}
.todo-list li.completed label {
color: #949494;
text-decoration: line-through;
}
.todo-list li .destroy {
display: none;
position: absolute;
top: 0;
right: 10px;
bottom: 0;
width: 40px;
height: 40px;
margin: auto 0;
font-size: 30px;
color: #949494;
transition: color 0.2s ease-out;
}
.todo-list li .destroy:hover,
.todo-list li .destroy:focus {
color: #C18585;
}
.todo-list li .destroy:after {
content: '×';
display: block;
height: 100%;
line-height: 1.1;
}
.todo-list li:hover .destroy {
display: block;
}
.todo-list li .edit {
display: none;
}
.todo-list li.editing:last-child {
margin-bottom: -1px;
}
.footer {
padding: 10px 15px;
height: 20px;
text-align: center;
font-size: 15px;
border-top: 1px solid #e6e6e6;
}
.footer:before {
content: '';
position: absolute;
right: 0;
bottom: 0;
left: 0;
height: 50px;
overflow: hidden;
box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2),
0 8px 0 -3px #f6f6f6,
0 9px 1px -3px rgba(0, 0, 0, 0.2),
0 16px 0 -6px #f6f6f6,
0 17px 2px -6px rgba(0, 0, 0, 0.2);
}
.todo-count {
float: left;
text-align: left;
}
.todo-count strong {
font-weight: 300;
}
.filters {
margin: 0;
padding: 0;
list-style: none;
position: absolute;
right: 0;
left: 0;
}
.filters li {
display: inline;
}
.filters li a {
color: inherit;
margin: 3px;
padding: 3px 7px;
text-decoration: none;
border: 1px solid transparent;
border-radius: 3px;
}
.filters li a:hover {
border-color: #DB7676;
}
.filters li a.selected {
border-color: #CE4646;
}
.clear-completed,
html .clear-completed:active {
float: right;
position: relative;
line-height: 19px;
text-decoration: none;
cursor: pointer;
}
.clear-completed:hover {
text-decoration: underline;
}
.info {
margin: 65px auto 0;
color: #4d4d4d;
font-size: 11px;
text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
text-align: center;
}
.info p {
line-height: 1;
}
.info a {
color: inherit;
text-decoration: none;
font-weight: 400;
}
.info a:hover {
text-decoration: underline;
}
/*
Hack to remove background from Mobile Safari.
Can't use it globally since it destroys checkboxes in Firefox
*/
@media screen and (-webkit-min-device-pixel-ratio:0) {
.toggle-all,
.todo-list li .toggle {
background: none;
}
.todo-list li .toggle {
height: 40px;
}
}
@media (max-width: 430px) {
.footer {
height: 50px;
}
.filters {
bottom: 10px;
}
}
:focus,
.toggle:focus + label,
.toggle-all:focus + label {
box-shadow: 0 0 2px 2px #CF7D7D;
outline: 0;
}

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../../src/Prelude.newt

190
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module Todo
import Prelude
import Web.Spruce
data FilterState = All | Active | Completed
derive Eq FilterState
data Msg
= Toggle Nat
| Remove Nat
-- TODO behavior varies by implementation, but probably should do return / esc / blur
| StartEdit Nat
| EndEdit Nat String
| Change String
| Filter FilterState
| Clear
| ToggleAll
record Item where
checked : Bool
text : String
data EditState = NoEdit | Edit Nat
record Model where
items : List Item
newText : String
filter : FilterState
edit : EditState
ElCon : U
ElCon = List (Attr Msg) → List (VNode Msg) → VNode Msg
-- Attributes
onChange : (String → Msg) → Attr Msg
onChange = VAttr "onChange"
onClick : Msg → Attr Msg
onClick action = MAttr "OnClick" action
className : String → Attr Msg
className v = SAttr "class" v
checkbox : Bool → Nat → VNode Msg
checkbox checked ix =
tag "input" [ className "toggle"
, SAttr "checked" (ite checked "true" "")
, onChange (\ _ => Toggle ix)
, SAttr "type" "checkbox" ] []
-- Elements
section : ElCon
section = tag "section"
header : ElCon
header = tag "header"
footer : ElCon
footer = tag "footer"
div : ElCon
div = tag "div"
ul : ElCon
ul = tag "ul"
li : ElCon
li = tag "li"
span : ElCon
span = tag "span"
id_ : String → Attr Msg
id_ id = SAttr "id" id
itemView : FilterState → EditState → Nat × Item → Maybe (VNode Msg)
itemView filter estate (ix , item) =
if exclude filter item then Nothing else
Just $ li [ className (getCName estate) ]
[ div [ className "view", MAttr "onDblClick" (StartEdit ix) ]
[ checkbox item.checked ix
, tag "label" [] [text item.text]
, tag "button" [ className "destroy", MAttr "onClick" (Remove ix)] []
]
, tag "input" [ className "edit"
, onChange (EndEdit ix)
, SAttr "value" item.text ] [ ]
]
where
getCName : EditState → String
getCName NoEdit = ite item.checked "completed" ""
getCName (Edit n) = if n == ix then "editing" else if item.checked then "completed" else ""
exclude : FilterState → Item → Bool
exclude All _ = False
exclude Active (MkItem checked text) = checked
exclude Completed (MkItem checked text) = not checked
footerView : Model → VNode Msg
-- we don't have undefined/empty at the moment..
footerView (MkModel Nil _ _ _) = div [] []
footerView (MkModel items _ select _) =
let count = length' $ filter (\ item => not item.checked) items
ccount = length' $ filter (\ item => item.checked) items
label = text $ if count == 1 then " item left" else " items left"
in footer [className "footer"]
[ span [ className "todo-count" ] [ tag "strong" [] [ text $ show count ], label ]
, ul [ className "filters" ]
[ li [] [ tag "a" [ getClass All, onClick (Filter All)] [ text "All" ]]
, li [] [ tag "a" [ getClass Active, onClick (Filter Active)] [ text "Active" ]]
, li [] [ tag "a" [ getClass Completed, onClick (Filter Completed)] [ text "Completed" ]]
]
, (if ccount == 0 then div [] [] else tag "button" [ className "clear-completed", onClick Clear ] [ text "Clear completed" ])
]
where
getClass : FilterState → Attr Msg
getClass x = if x == select then className "selected" else className ""
listView : Model → VNode Msg
listView (MkModel Nil _ _ _) = div [] []
listView (MkModel items newText select estate) =
let count = length' items
acount = length' $ (filter (\ item => not item.checked) items)
in tag "section" [ className "main" ]
[ tag "input" [ id_ "toggle-all"
, className "toggle-all"
, onClick ToggleAll
, SAttr "type" "checkbox"] []
-- accessibility
, tag "label" [ SAttr "for" "toggle-all"] [ text "Mark all as complete" ]
, ul [ className "todo-list" ] (mapMaybe (itemView select estate) (enumerate items))
]
view : Model → VNode Msg
view model =
section [ className "todoapp" ]
[ header [ className "header" ]
[ tag "h1" [] [ text "todos" ]
, tag "input" [ className "new-todo"
, SAttr "placeholder" "What needs to be done?"
, SAttr "value" model.newText
, VAttr "onChange" Change
, SAttr "autofocus" "true"] []]
, listView model
, footerView model
]
isEmpty : ∀ a. List a → Bool
isEmpty Nil = True
isEmpty _ = False
update : Msg → Model → Model
update Clear model = { items $= filter (\ item => not item.checked) } model
update (StartEdit ix) model = { edit := Edit ix } model
update (EndEdit ix text) model = { edit := NoEdit; items $= edit ix } model
where
edit : Nat → List Item → List Item
edit Z (item :: items) = the Item { text := text } item :: items
edit (S k) (item :: items) = item :: edit k items
edit _ Nil = Nil
update ToggleAll model =
let checked = not $ isEmpty $ filter (\item => not item.checked) model.items
in { items $= map (the (Item → Item) { checked := checked }) } model
update (Toggle ix) model = { items $= toggle ix } model
where
toggleItem : Item → Item
toggleItem item = { checked := not item.checked } item
toggle : Nat → List Item → List Item
toggle _ Nil = Nil
toggle Z (item :: rest) = toggleItem item :: rest
toggle (S k) (item :: rest) = item :: toggle k rest
update (Filter filter) model = { filter := filter } model
update (Remove ix) model = {items $= delete ix } model
where
delete : Nat → List Item → List Item
delete _ Nil = Nil
delete Z (item :: rest) = rest
delete (S k) (item :: rest) = item :: delete k rest
update (Change text) model = { items := (snoc model.items $ MkItem False text) } model
main : IO Unit
main = pure $ runApp (getElementById "main") (MkModel [] "" All NoEdit) update view

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todomvc/src/Web Symbolic link
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../../src/Web