Add some styling.

scss/style.scss

@@ -0,0 +1,85 @@
+$off-grey-color: #ededed;
+$off-color: #eef2f9;
+
+body {
+    font-family: sans-serif;
+}
+
+.main {
+    margin: auto;
+    max-width: 1600px;
+}
+
+.split-pane {
+    display: flex;
+    flex-direction: vertical;
+}
+
+.split-elem {
+    flex-grow: 1;
+}
+
+.table-wrapper {
+    border: 1px solid $off-grey-color;
+    padding-top: 0.5rem;
+    padding-bottom: 1rem;
+    border-radius: 0.25rem;
+    display: inline-block;
+    margin-top: 1rem;
+    box-shadow: 0px 0px 5px rgba(grey, 0.1);
+}
+
+.class-table {
+    border-collapse: collapse;
+
+    th, td {
+        padding: 0.5rem;
+        padding-left: 1rem;
+        padding-right: 1rem;
+    }
+
+    th {
+        text-align: left;
+    }
+
+    tr {
+        transition: background-color 0.2s;
+
+        &:nth-child(2n+3) {
+            background-color: $off-color;
+        }
+
+        &.hoverable:hover {
+            background-color: lighten(yellow, 30%);
+        }
+
+        &.selected {
+            border: 1px dashed black;
+        }
+    }
+}
+
+.feather {
+    vertical-align: middle;
+    height: 1rem;
+}
+
+.button {
+    border: 1px solid black;
+    padding: 0.25rem;
+    border-radius: 0.25rem;
+
+    vertical-align: middle;
+
+    &.color-green {
+        background-color: lighten(#5bc275, 30%);
+        border-color: #5bc275;
+        color: darken(#5bc275, 30%);
+    }
+
+    &.color-red {
+        background-color: lighten(#c25b75, 30%);
+        border-color: #c25b75;
+        color: darken(#c25b75, 30%);
+    }
+}

src/ClassSchedule/Model.elm

@@ -49,29 +49,20 @@ type alias Course =
     , times : List (DayOfWeek, Time, Time)
     }
 
-type CourseStatus = None | Selected | Added
-
-isSelected : CourseStatus -> Bool
-isSelected cs =
-    case cs of
-        Selected -> True
-        _ -> False
-
-isAdded : CourseStatus -> Bool
-isAdded cs =
-    case cs of
-        Added -> True
-        _ -> False
+type CourseStatus = NotAdded | Added
 
 type alias Flags = ()
 
 type Msg
     = SearchInput String
     | SelectTerm String
-    | MarkCourse Int CourseStatus
+    | SelectCourse Int
+    | AddCourse Int
+    | RemoveCourse Int
 
 type alias Model =
     { terms : Dict String (List (CourseStatus, Course))
     , term : String
+    , selected : Maybe Int
     , searchInput : String
     }

src/ClassSchedule/View.elm

@@ -1,9 +1,15 @@
 module ClassSchedule.View exposing (..)
 import ClassSchedule.Model exposing (..)
-import Html exposing (Html, div, text, table, td, th, tr, span, input, h1)
+import Html exposing (Html, Attribute, div, text, table, td, th, tr, span, input, h1)
 import Html.Attributes exposing (class, classList, type_)
+import Html.Events exposing (onClick)
 import Tuple exposing (..)
 import Dict exposing (..)
+import FeatherIcons
+
+iconButton : String -> FeatherIcons.Icon -> String -> List (Attribute Msg) -> Html Msg
+iconButton c i s attrs = span ([ class "button", class ("color-" ++ c) ] ++ attrs)
+    [ FeatherIcons.toHtml [] i, text s ]
 
 viewDept : Department -> String
 viewDept d =
@@ -50,7 +56,7 @@ unique l =
 
 extractTimes : Course -> List (Time, Time)
 extractTimes c =
-    let extractTime (d, t1, t2) = (t2, t2)
+    let extractTime (d, t1, t2) = (t1, t2)
     in unique <| List.map extractTime (c.times)
 
 extractClasses : Course -> (Time, Time) -> List DayOfWeek
@@ -66,25 +72,41 @@ extractTimeCodes c =
             in dayCodes ++ " " ++ viewTimeRange tr
     in List.map fromTime <| extractTimes c
 
-viewClass : Course -> Html Msg
-viewClass c = tr []
-    [ td [] [ text <| viewCrn (c.crn) ]
-    , td [] [ text <| c.name ]
-    , td [] [ text <| String.join ", " <| c.instructors ]
-    , td [] [ text <| String.join ", " <| extractTimeCodes c ]
-    ]
+viewClass : Maybe Int -> Int -> (CourseStatus, Course) -> Html Msg
+viewClass sel i (cs, c) =
+    let
+        isSelected = sel == Just i
+        addedIndicator =
+            case cs of
+                Added -> [ FeatherIcons.check |> FeatherIcons.toHtml [] ]
+                NotAdded -> []
+    in
+        tr [ class "hoverable", onClick (SelectCourse i), classList [("selected", isSelected)] ]
+            [ td [] addedIndicator
+            , td [] [ text <| viewCrn (c.crn) ]
+            , td [] [ text <| c.name ]
+            , td [] [ text <| String.join ", " <| c.instructors ]
+            , td [] [ text <| String.join ", " <| extractTimeCodes c ]
+            , td [] <|
+                case (isSelected, cs) of
+                    (True, NotAdded) -> [ iconButton "green" (FeatherIcons.check) "Add" [ onClick (AddCourse i)] ]
+                    (True, Added) -> [ iconButton "red" (FeatherIcons.x) "Remove" [onClick (RemoveCourse i)] ]
+                    _ -> []
+            ]
 
-viewClassTable : List (CourseStatus, Course) -> Html Msg
-viewClassTable =
+viewClassTable : Maybe Int -> List (CourseStatus, Course) -> Html Msg
+viewClassTable sel =
     let
         header = tr []
-            [ th [] [ text "Crn." ]
+            [ th [] [ ]
+            , th [] [ text "Crn." ]
             , th [] [ text "Course Name" ]
             , th [] [ text "Instructors" ]
             , th [] [ text "Times" ]
+            , th [] []
             ]
     in
-        table [] << (::) header << List.map (viewClass << second)
+        div [ class "table-wrapper" ] << List.singleton << table [ class "class-table" ] << (::) header << List.indexedMap (viewClass sel)
 
 viewToolbar : Model -> Html Msg
 viewToolbar m = div []
@@ -95,12 +117,14 @@ viewClassList : Model -> Html Msg
 viewClassList m = div []
     [ viewToolbar m
     , case get (m.term) (m.terms) of
-        Just cs -> viewClassTable cs
+        Just cs -> viewClassTable (m.selected) cs
         Nothing -> text "Please select a term!"
     ]
 
 viewClassSchedule : Model -> Html Msg
-viewClassSchedule m = text "Class schedule goes here!"
+viewClassSchedule m = div [ class "table-wrapper" ]
+    [ text "Nothing here yet!" 
+    ]
 
 viewModel : Model -> Html Msg
 viewModel m = div [ class "main" ]

src/Main.elm

@@ -34,14 +34,19 @@ classes =
       , instructors = ["Eric Walkingshaw"]
       , times = onDays [Monday, Wednesday] <| oneHour <| nAm 10
       }
+    , { crn = (ComputerScience, 582)
+      , name = "Programming Languages II"
+      , instructors = ["Martin Erwig"]
+      , times = onDays [Monday, Wednesday] <| oneHour <| nPm 4
+      }
     ]
 
 terms : Dict String (List (CourseStatus, Course))
 terms = Dict.singleton "Spring 2021"
-    <| List.map (pair None) classes
+    <| List.map (pair NotAdded) classes
 
 init : Flags -> (Model, Cmd Msg)
-init () = ({ terms = terms, term = "Spring 2021", searchInput = "" }, Cmd.none)
+init () = ({ terms = terms, term = "Spring 2021", searchInput = "", selected = Nothing }, Cmd.none)
 
 view : Model -> Document Msg
 view m =
@@ -49,8 +54,21 @@ view m =
     , body = [ viewModel m ]
     }
 
+modifyCurrent : (List (CourseStatus, Course) -> List (CourseStatus, Course)) -> Model -> Model
+modifyCurrent f m = { m | terms = Dict.update (m.term) (Maybe.map f) (m.terms) }
+
+changeCourse : Int -> CourseStatus -> List (CourseStatus, Course) -> List (CourseStatus, Course)
+changeCourse i ncs =
+    let updateCourses j (cs, c) = if i == j then (ncs, c) else (cs, c)
+    in List.indexedMap updateCourses
+
 update : Msg -> Model -> (Model, Cmd Msg)
-update msg m = (m, Cmd.none)
+update msg m =
+    case msg of
+        SelectCourse i -> ({ m | selected = Just i}, Cmd.none)
+        AddCourse i -> (modifyCurrent (changeCourse i Added) m, Cmd.none)
+        RemoveCourse i -> (modifyCurrent (changeCourse i NotAdded) m, Cmd.none)
+        _ -> (m, Cmd.none)
 
 subscriptions : Model -> Sub Msg
 subscriptions m = Sub.none