elm(todolist): feat: basic todo operations

Signed-off-by: prescientmoon <git@moonythm.dev>

elm/todolist/elm-analyse.json

@@ -0,0 +1,6 @@
+{
+  "checks": {
+    "ExposeAll": false,
+    "ImportAll": false
+  }
+}

elm/todolist/src/Main.elm

@@ -1,20 +1,36 @@
 module Main exposing (..)
 
 import Browser
-import Html exposing (Html, text, div, h1, img)
-import Html.Attributes exposing (src)
+import Html exposing (..)
+import Html.Attributes exposing (..)
+import Html.Events exposing (..)
+
+
+
+-- HELPER TYPES
+
+
+type alias Todo =
+    { done : Bool
+    , text : String
+    , id : Int
+    }
+
 
 
 ---- MODEL ----
 
 
 type alias Model =
-    {}
+    { todos : List Todo
+    , lastId : Int
+    , nextTodoText : String
+    }
 
 
-init : ( Model, Cmd Msg )
+init : Model
 init =
-    ( {}, Cmd.none )
+    Model [] 0 ""
 
 
 
@@ -22,12 +38,48 @@ init =
 
 
 type Msg
-    = NoOp
+    = AddTodo
+    | DeleteTodo Int
+    | ToggleTodoCompletion Int
+    | SetNextTodoText String
 
 
-update : Msg -> Model -> ( Model, Cmd Msg )
-update msg model =
-    ( model, Cmd.none )
+update : Msg -> Model -> Model
+update message model =
+    case message of
+        AddTodo ->
+            if model.nextTodoText == "" then
+                model
+
+            else
+                let
+                    id =
+                        model.lastId + 1
+
+                    text =
+                        model.nextTodoText
+                in
+                { model | lastId = id, todos = Todo False text id :: model.todos }
+
+        DeleteTodo id ->
+            { model | todos = List.filter ((/=) id << .id) model.todos }
+
+        ToggleTodoCompletion id ->
+            { model
+                | todos =
+                    List.map
+                        (\todo ->
+                            if todo.id == id then
+                                { todo | done = not todo.done }
+
+                            else
+                                todo
+                        )
+                        model.todos
+            }
+
+        SetNextTodoText text ->
+            { model | nextTodoText = text }
 
 
 
@@ -36,9 +88,69 @@ update msg model =
 
 view : Model -> Html Msg
 view model =
-    div []
-        [ img [ src "/logo.svg" ] []
-        , h1 [] [ text "Your Elm App is working!" ]
+    div [ class "container" ]
+        [ header model
+        , div [ class "todos" ] <|
+            List.map
+                todoView
+                model.todos
+        ]
+
+
+
+-- HEADER
+
+
+header : Model -> Html Msg
+header _ =
+    div [ class "header" ]
+        [ button
+            [ class "btn"
+            , onClick AddTodo
+            ]
+            [ text "add todo" ]
+        , input
+            [ placeholder "todo text"
+            , onInput SetNextTodoText
+            , class "todoTextInput"
+            ]
+            []
+        ]
+
+
+
+-- _TODO VIEW
+
+
+todoClasses : Todo -> String
+todoClasses todo =
+    "todo"
+        ++ (if todo.done then
+                " completed"
+
+            else
+                ""
+           )
+
+
+todoView : Todo -> Html Msg
+todoView todo =
+    div [ class <| todoClasses todo ]
+        [ div [ class "todoCompleted" ]
+            [ input
+                [ checked todo.done
+                , type_ "checkbox"
+                , class "todoCheckbox"
+                , onCheck <| \_ -> ToggleTodoCompletion todo.id
+                ]
+                []
+            ]
+        , div [ class "todoText" ] [ text todo.text ]
+        , button
+            [ class "btn"
+            , onClick <| DeleteTodo todo.id
+            ]
+            [ text "Delete todo" ]
         ]
 
 
@@ -48,9 +160,8 @@ view model =
 
 main : Program () Model Msg
 main =
-    Browser.element
+    Browser.sandbox
         { view = view
-        , init = \_ -> init
+        , init = init
         , update = update
-        , subscriptions = always Sub.none
         }

elm/todolist/src/main.css

@@ -9,18 +9,103 @@
   height: inherit;
 }
 
+:root {
+  --secondary: #009fb7;
+  --primary: #1a213b;
+  --on-secondary: #eff1f4;
+  --disabled: #555555;
+}
+
 body {
-  font-family: 'Source Sans Pro', 'Trebuchet MS', 'Lucida Grande', 'Bitstream Vera Sans', 'Helvetica Neue', sans-serif;
+  font-family: "Source Sans Pro", "Trebuchet MS", "Lucida Grande",
+    "Bitstream Vera Sans", "Helvetica Neue", sans-serif;
   margin: 0;
-  text-align: center;
-  color: #293c4b;
+  background: var(--primary);
+
+  color: var(--on-secondary);
 }
 
 h1 {
   font-size: 30px;
 }
 
-img {
-  margin: 20px 0;
-  max-width: 200px;
+.header {
+  display: flex;
+}
+
+.btn {
+  background-color: var(--secondary);
+  color: var(--on-secondary);
+  padding: 1rem;
+  margin: 1rem;
+  border: none;
+}
+
+input {
+  outline: none;
+}
+
+.todos {
+  display: flex;
+  flex-direction: column;
+  min-height: 67vh;
+  border: 1px solid var(--secondary);
+}
+
+.todo {
+  transition: filter 0.5s;
+  background: var(--primary);
+  display: flex;
+}
+
+.todo:hover {
+  filter: brightness(1.4);
+}
+
+.todo.completed {
+  color: var(--disabled);
+
+  text-decoration: line-through;
+}
+
+.todo.completed > .btn {
+  color: var(--disabled);
+}
+
+.todo > * {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}
+
+.todoText {
+  justify-content: flex-start;
+  flex-direction: row;
+  flex-grow: 1;
+}
+
+.todoCompleted {
+  margin: 1rem;
+}
+
+.todoTextInput {
+  background: var(--primary);
+  border: 1px var(--secondary) solid;
+  margin: 1rem;
+  padding: 2px;
+  box-sizing: border-box;
+  color: var(--on-secondary);
+  font-size: 1.5rem;
+  transition: filter 0.5s;
+}
+
+.todoTextInput:focus {
+  filter: brightness(1.4);
+}
+
+.todoCheckbox {
+  width: 1rem;
+  height: 1rem;
+  background: var(--secondary);
 }