Improve filter (#714)

* Update elm-tools/parser

* Improve filter UI

* Pressing backspace edits the last matcher

* Put escape char back into the output

* Allow editing the matcher

* Update bindata.go

* Const for key codes

* Use qualified imports

* Update bindata.go

* Commented the backspacePressed attribute

ui/app/elm-package.json

@@ -9,10 +9,11 @@
     "exposed-modules": [],
     "dependencies": {
         "elm-lang/core": "5.0.0 <= v < 6.0.0",
+        "elm-lang/dom": "1.1.1 <= v < 2.0.0",
         "elm-lang/html": "2.0.0 <= v < 3.0.0",
         "elm-lang/http": "1.0.0 <= v < 2.0.0",
         "elm-lang/navigation": "2.0.1 <= v < 3.0.0",
-        "elm-tools/parser": "1.0.2 <= v < 2.0.0",
+        "elm-tools/parser": "2.0.0 <= v < 3.0.0",
         "evancz/url-parser": "2.0.1 <= v < 3.0.0",
         "jweir/elm-iso8601": "3.0.2 <= v < 4.0.0"
     },

ui/app/src/Main.elm

@@ -24,6 +24,7 @@ import Types
 import Utils.Types exposing (..)
 import Views.SilenceForm.Types exposing (initSilenceForm)
 import Views.Status.Types exposing (StatusModel, initStatusModel)
+import Views.AlertList.Types exposing (initAlertList)
 import Updates exposing (update)
 
 
@@ -55,7 +56,7 @@ init location =
                     nullFilter
 
         ( model, msg ) =
-            update (urlUpdate location) (Model Loading Loading initSilenceForm Loading route filter 0 initStatusModel)
+            update (urlUpdate location) (Model Loading Loading initSilenceForm initAlertList route filter 0 initStatusModel)
     in
         model ! [ msg, Task.perform UpdateCurrentTime Time.now ]
 

ui/app/src/Types.elm

@@ -1,7 +1,7 @@
 module Types exposing (Model, Msg(..), Route(..))
 
 import Alerts.Types exposing (AlertGroup, Alert)
-import Views.AlertList.Types exposing (AlertListMsg)
+import Views.AlertList.Types as AlertList exposing (AlertListMsg)
 import Views.SilenceList.Types exposing (SilenceListMsg)
 import Views.Silence.Types exposing (SilenceMsg)
 import Views.SilenceForm.Types as SilenceForm exposing (SilenceFormMsg)
@@ -15,7 +15,7 @@ type alias Model =
     { silences : ApiData (List Silence)
     , silence : ApiData Silence
     , silenceForm : SilenceForm.Model
-    , alertGroups : ApiData (List AlertGroup)
+    , alertList : AlertList.Model
     , route : Route
     , filter : Filter
     , currentTime : Time.Time
@@ -40,8 +40,7 @@ type Msg
     | Noop
     | RedirectAlerts
     | UpdateCurrentTime Time.Time
-    | UpdateFilter Filter String
-    | AddLabel Msg Label
+    | UpdateFilter String
 
 
 type Route

ui/app/src/Updates.elm

@@ -25,7 +25,6 @@ import Views.SilenceList.Updates
 import Views.Status.Types exposing (StatusMsg(InitStatusView))
 import Views.Status.Updates
 import String exposing (trim)
-import Regex
 
 
 update : Msg -> Model -> ( Model, Cmd Msg )
@@ -43,10 +42,10 @@ update msg model =
 
         NavigateToAlerts filter ->
             let
-                ( alertGroups, cmd ) =
-                    Views.AlertList.Updates.update FetchAlertGroups model.alertGroups filter
+                ( alertList, cmd ) =
+                    Views.AlertList.Updates.update FetchAlertGroups model.alertList filter
             in
-                ( { model | alertGroups = alertGroups, route = AlertsRoute filter, filter = filter }, cmd )
+                ( { model | alertList = alertList, route = AlertsRoute filter, filter = filter }, cmd )
 
         NavigateToSilenceList filter ->
             let
@@ -87,44 +86,18 @@ update msg model =
         RedirectAlerts ->
             ( model, Navigation.newUrl "/#/alerts" )
 
-        UpdateFilter filter text ->
+        UpdateFilter text ->
             let
                 t =
                     if trim text == "" then
                         Nothing
                     else
                         Just text
-            in
-                ( { model | filter = { filter | text = t } }, Cmd.none )
 
-        AddLabel msg ( key, value ) ->
-            let
-                filter =
+                prevFilter =
                     model.filter
-
-                label =
-                    key ++ "=" ++ toString value
-
-                labels =
-                    Maybe.withDefault "" filter.text
-                        |> Regex.replace Regex.All (Regex.regex "{|}") (\_ -> "")
-                        |> Regex.split Regex.All (Regex.regex "\\s*,\\s*")
-                        |> List.filter (String.isEmpty >> not)
-                        |> (\labels ->
-                                if List.member label labels then
-                                    labels
-                                else
-                                    labels ++ [ label ]
-                           )
-                        |> String.join ", "
-
-                text =
-                    if String.isEmpty labels then
-                        Nothing
-                    else
-                        Just ("{" ++ labels ++ "}")
             in
-                ( { model | filter = { filter | text = text } }, Task.perform identity (Task.succeed msg) )
+                ( { model | filter = { prevFilter | text = t } }, Cmd.none )
 
         Noop ->
             ( model, Cmd.none )
@@ -137,10 +110,10 @@ update msg model =
 
         MsgForAlertList msg ->
             let
-                ( alertGroups, cmd ) =
-                    Views.AlertList.Updates.update msg model.alertGroups model.filter
+                ( alertList, cmd ) =
+                    Views.AlertList.Updates.update msg model.alertList model.filter
             in
-                ( { model | alertGroups = alertGroups }, cmd )
+                ( { model | alertList = alertList }, cmd )
 
         MsgForSilenceList msg ->
             let

ui/app/src/Utils/Date.elm

@@ -15,7 +15,7 @@ parseDuration =
 durationParser : Parser Time.Time
 durationParser =
     Parser.succeed (List.foldr (+) 0)
-        |= Parser.zeroOrMore term
+        |= Parser.repeat Parser.zeroOrMore term
         |. Parser.end
 
 
@@ -42,7 +42,7 @@ term =
             |> List.map (\( unit, ms ) -> Parser.succeed ms |. Parser.symbol unit)
             |> Parser.oneOf
         )
-        |. Parser.ignoreWhile ((==) ' ')
+        |. Parser.ignore Parser.zeroOrMore ((==) ' ')
 
 
 durationFormat : Time.Time -> String

ui/app/src/Utils/Filter.elm

@@ -1,7 +1,21 @@
-module Utils.Filter exposing (..)
+module Utils.Filter
+    exposing
+        ( Matcher
+        , MatchOperator(..)
+        , generateQueryParam
+        , generateQueryString
+        , stringifyMatcher
+        , stringifyFilter
+        , parseFilter
+        , parseMatcher
+        )
 
 import Utils.Types exposing (Filter)
 import Http exposing (encodeUri)
+import Parser exposing (Parser, (|.), (|=), zeroOrMore, ignore)
+import Parser.LanguageKit as Parser exposing (Trailing(..))
+import Char
+import Set
 
 
 generateQueryParam : String -> Maybe String -> Maybe String
@@ -18,3 +32,136 @@ generateQueryString { receiver, showSilenced, text } =
         |> List.filterMap (uncurry generateQueryParam)
         |> String.join "&"
         |> (++) "?"
+
+
+type alias Matcher =
+    { key : String
+    , op : MatchOperator
+    , value : String
+    }
+
+
+type MatchOperator
+    = Eq
+    | NotEq
+    | RegexMatch
+    | NotRegexMatch
+
+
+matchers : List ( String, MatchOperator )
+matchers =
+    [ ( "=~", RegexMatch )
+    , ( "!~", NotRegexMatch )
+    , ( "=", Eq )
+    , ( "!=", NotEq )
+    ]
+
+
+parseFilter : String -> Maybe (List Matcher)
+parseFilter =
+    Parser.run filter
+        >> Result.toMaybe
+
+
+parseMatcher : String -> Maybe Matcher
+parseMatcher =
+    Parser.run matcher
+        >> Result.toMaybe
+
+
+stringifyFilter : List Matcher -> String
+stringifyFilter matchers =
+    case matchers of
+        [] ->
+            ""
+
+        list ->
+            (list
+                |> List.map stringifyMatcher
+                |> String.join ", "
+                |> (++) "{"
+            )
+                ++ "}"
+
+
+stringifyMatcher : Matcher -> String
+stringifyMatcher { key, op, value } =
+    key
+        ++ (matchers
+                |> List.filter (Tuple.second >> (==) op)
+                |> List.head
+                |> Maybe.map Tuple.first
+                |> Maybe.withDefault ""
+           )
+        ++ "\""
+        ++ value
+        ++ "\""
+
+
+filter : Parser (List Matcher)
+filter =
+    Parser.succeed identity
+        |= Parser.record spaces item
+        |. Parser.end
+
+
+matcher : Parser Matcher
+matcher =
+    Parser.succeed identity
+        |. spaces
+        |= item
+        |. spaces
+        |. Parser.end
+
+
+item : Parser Matcher
+item =
+    Parser.succeed Matcher
+        |= Parser.variable isVarChar isVarChar Set.empty
+        |= (matchers
+                |> List.map
+                    (\( keyword, matcher ) ->
+                        Parser.succeed matcher
+                            |. Parser.keyword keyword
+                    )
+                |> Parser.oneOf
+           )
+        |= string '"'
+
+
+spaces : Parser ()
+spaces =
+    ignore zeroOrMore (\char -> char == ' ' || char == '\t')
+
+
+string : Char -> Parser String
+string separator =
+    Parser.succeed identity
+        |. Parser.symbol (String.fromChar separator)
+        |= stringContents separator
+        |. Parser.symbol (String.fromChar separator)
+
+
+stringContents : Char -> Parser String
+stringContents separator =
+    Parser.oneOf
+        [ Parser.succeed (++)
+            |= keepOne (\char -> char == '\\')
+            |= keepOne (\char -> True)
+        , Parser.keep Parser.oneOrMore (\char -> char /= separator && char /= '\\')
+        ]
+        |> Parser.repeat Parser.oneOrMore
+        |> Parser.map (String.join "")
+
+
+isVarChar : Char -> Bool
+isVarChar char =
+    Char.isLower char
+        || Char.isUpper char
+        || (char == '_')
+        || Char.isDigit char
+
+
+keepOne : (Char -> Bool) -> Parser String
+keepOne =
+    Parser.keep (Parser.Exactly 1)

ui/app/src/Views.elm

@@ -3,7 +3,6 @@ module Views exposing (..)
 import Html exposing (Html, text, div)
 import Html.Attributes exposing (class)
 import Types exposing (Msg(MsgForSilenceForm), Model, Route(..))
-import Utils.Types exposing (ApiResponse(..))
 import Utils.Views exposing (error, loading)
 import Views.SilenceList.Views as SilenceList
 import Views.SilenceForm.Views as SilenceForm
@@ -33,15 +32,7 @@ currentView model =
             Silence.view model
 
         AlertsRoute filter ->
-            case model.alertGroups of
-                Success alertGroups ->
-                    AlertList.view alertGroups model.filter (text "")
-
-                Loading ->
-                    loading
-
-                Failure msg ->
-                    AlertList.view [] model.filter (error msg)
+            AlertList.view model.alertList filter
 
         SilenceListRoute route ->
             SilenceList.view model.silences model.silence model.currentTime model.filter

ui/app/src/Views/AlertList/FilterBar.elm

@@ -1,20 +1,151 @@
 module Views.AlertList.FilterBar exposing (view)
 
-import Html exposing (Html, div, span, input, text, button, i)
-import Html.Attributes exposing (value, class)
-import Html.Events exposing (onClick, onInput)
+import Html exposing (Html, Attribute, div, span, input, text, button, i, small)
+import Html.Attributes exposing (value, class, style, disabled, id)
+import Html.Events exposing (onClick, onInput, on, keyCode)
+import Utils.Filter exposing (Matcher)
+import Views.AlertList.Types exposing (AlertListMsg(AddFilterMatcher, DeleteFilterMatcher, PressingBackspace, UpdateMatcherText))
+import Types exposing (Msg(MsgForAlertList, Noop))
+import Json.Decode as Json
 
 
-view : String -> (String -> msg) -> msg -> Html msg
-view filterText inputChangedMsg buttonClickedMsg =
-    div [ class "input-group" ]
-        [ span [ class "input-group-addon" ]
-            [ i [ class "fa fa-filter" ] []
+keys :
+    { backspace : Int
+    , enter : Int
+    }
+keys =
+    { backspace = 8
+    , enter = 13
+    }
+
+
+viewMatcher : Matcher -> Html Msg
+viewMatcher matcher =
+    div [ class "col col-auto", style [ ( "padding", "5px" ) ] ]
+        [ div [ class "btn-group" ]
+            [ button
+                [ class "btn btn-outline-info"
+                , onClick (DeleteFilterMatcher True matcher |> MsgForAlertList)
+                ]
+                [ text <| Utils.Filter.stringifyMatcher matcher
+                ]
+            , button
+                [ class "btn btn-outline-danger"
+                , onClick (DeleteFilterMatcher False matcher |> MsgForAlertList)
+                ]
+                [ text "×" ]
             ]
-        , input
-            [ class "form-control", value filterText, onInput inputChangedMsg ]
-            []
-        , span
-            [ class "input-group-btn" ]
-            [ button [ class "btn btn-primary", onClick buttonClickedMsg ] [ text "Filter" ] ]
         ]
+
+
+lastElem : List a -> Maybe a
+lastElem =
+    List.foldl (Just >> always) Nothing
+
+
+viewMatchers : List Matcher -> List (Html Msg)
+viewMatchers matchers =
+    matchers
+        |> List.map viewMatcher
+
+
+onKey : String -> Int -> Msg -> Attribute Msg
+onKey event key msg =
+    on event
+        (Json.map
+            (\k ->
+                if k == key then
+                    msg
+                else
+                    Noop
+            )
+            keyCode
+        )
+
+
+view : List Matcher -> String -> Bool -> Html Msg
+view matchers matcherText backspacePressed =
+    let
+        className =
+            if matcherText == "" then
+                ""
+            else
+                case maybeMatcher of
+                    Just _ ->
+                        "has-success"
+
+                    Nothing ->
+                        "has-danger"
+
+        maybeMatcher =
+            Utils.Filter.parseMatcher matcherText
+
+        onKeydown =
+            onKey "keydown" keys.backspace <|
+                case ( matcherText, backspacePressed ) of
+                    ( "", True ) ->
+                        Noop
+
+                    ( "", False ) ->
+                        lastElem matchers
+                            |> Maybe.map (DeleteFilterMatcher True >> MsgForAlertList)
+                            |> Maybe.withDefault Noop
+
+                    _ ->
+                        PressingBackspace True |> MsgForAlertList
+
+        onKeypress =
+            maybeMatcher
+                |> Maybe.map (AddFilterMatcher True >> MsgForAlertList)
+                |> Maybe.withDefault Noop
+                |> onKey "keypress" keys.enter
+
+        onKeyup =
+            onKey "keyup" keys.backspace (PressingBackspace False |> MsgForAlertList)
+
+        onClickAttr =
+            maybeMatcher
+                |> Maybe.map (AddFilterMatcher True >> MsgForAlertList)
+                |> Maybe.withDefault Noop
+                |> onClick
+
+        isDisabled =
+            maybeMatcher == Nothing
+    in
+        div
+            [ class "row no-gutters align-items-start" ]
+            (viewMatchers matchers
+                ++ [ div
+                        [ class ("col form-group " ++ className)
+                        , style
+                            [ ( "padding", "5px" )
+                            , ( "min-width", "200px" )
+                            , ( "max-width", "500px" )
+                            ]
+                        ]
+                        [ div [ class "input-group" ]
+                            [ input
+                                [ id "custom-matcher"
+                                , class "form-control"
+                                , value matcherText
+                                , onKeydown
+                                , onKeyup
+                                , onKeypress
+                                , onInput (UpdateMatcherText >> MsgForAlertList)
+                                ]
+                                []
+                            , span
+                                [ class "input-group-btn" ]
+                                [ button [ class "btn btn-primary", disabled isDisabled, onClickAttr ] [ text "Add" ] ]
+                            ]
+                        , small [ class "form-text text-muted" ]
+                            [ text "Custom matcher, e.g."
+                            , button
+                                [ class "btn btn-link btn-sm align-baseline"
+                                , onClick (UpdateMatcherText "env=\"production\"" |> MsgForAlertList)
+                                ]
+                                [ text "env=\"production\"" ]
+                            ]
+                        ]
+                   ]
+            )

ui/app/src/Views/AlertList/Types.elm

@@ -1,10 +1,40 @@
-module Views.AlertList.Types exposing (AlertListMsg(..))
+module Views.AlertList.Types exposing (AlertListMsg(..), Model, initAlertList)
 
-import Utils.Types exposing (ApiData, Filter)
+import Utils.Types exposing (ApiData, Filter, ApiResponse(Loading))
 import Alerts.Types exposing (Alert, AlertGroup)
+import Utils.Filter
 
 
 type AlertListMsg
     = AlertGroupsFetch (ApiData (List AlertGroup))
     | FetchAlertGroups
-    | FilterAlerts
+    | AddFilterMatcher Bool Utils.Filter.Matcher
+    | DeleteFilterMatcher Bool Utils.Filter.Matcher
+    | PressingBackspace Bool
+    | UpdateMatcherText String
+
+
+{-| A note about the `backspacePressed` attribute:
+
+Holding down the backspace removes (one by one) each last character in the input,
+and the whole time sends multiple keyDown events. This is a guard so that if a user
+holds down backspace to remove the text in the input, they won't accidentally hold
+backspace too long and then delete the preceding matcher as well. So, once a user holds
+backspace to clear an input, they have to then lift up the key and press it again to
+proceed to deleting the next matcher.
+-}
+type alias Model =
+    { alertGroups : ApiData (List AlertGroup)
+    , matchers : List Utils.Filter.Matcher
+    , backspacePressed : Bool
+    , matcherText : String
+    }
+
+
+initAlertList : Model
+initAlertList =
+    { alertGroups = Loading
+    , matchers = []
+    , backspacePressed = False
+    , matcherText = ""
+    }

ui/app/src/Views/AlertList/Updates.elm

@@ -1,22 +1,74 @@
 module Views.AlertList.Updates exposing (..)
 
 import Alerts.Api as Api
-import Views.AlertList.Types exposing (AlertListMsg(..))
-import Alerts.Types exposing (AlertGroup)
+import Views.AlertList.Types exposing (AlertListMsg(..), Model)
 import Navigation
-import Utils.Types exposing (ApiData, ApiResponse(..), Filter)
-import Utils.Filter exposing (generateQueryString)
-import Types exposing (Msg(MsgForAlertList))
+import Utils.Types exposing (ApiData, ApiResponse(Loading), Filter)
+import Utils.Filter exposing (generateQueryString, stringifyFilter, parseFilter)
+import Types exposing (Msg(MsgForAlertList, Noop))
+import Dom
+import Task
 
 
-update : AlertListMsg -> ApiData (List AlertGroup) -> Filter -> ( ApiData (List AlertGroup), Cmd Types.Msg )
-update msg groups filter =
+immediatelyFilter : Filter -> Model -> ( Model, Cmd Types.Msg )
+immediatelyFilter filter model =
+    let
+        newFilter =
+            { filter | text = Just (stringifyFilter model.matchers) }
+    in
+        ( model
+        , Cmd.batch
+            [ Navigation.newUrl ("/#/alerts" ++ generateQueryString newFilter)
+            , Dom.focus "custom-matcher" |> Task.attempt (always Noop)
+            ]
+        )
+
+
+update : AlertListMsg -> Model -> Filter -> ( Model, Cmd Types.Msg )
+update msg model filter =
     case msg of
         AlertGroupsFetch alertGroups ->
-            ( alertGroups, Cmd.none )
+            ( { model | alertGroups = alertGroups }, Cmd.none )
 
         FetchAlertGroups ->
-            ( groups, Api.alertGroups filter |> Cmd.map (AlertGroupsFetch >> MsgForAlertList) )
+            ( { model
+                | matchers =
+                    filter.text
+                        |> Maybe.andThen parseFilter
+                        |> Maybe.withDefault []
+                , alertGroups = Loading
+              }
+            , Api.alertGroups filter |> Cmd.map (AlertGroupsFetch >> MsgForAlertList)
+            )
 
-        FilterAlerts ->
-            ( groups, Navigation.newUrl ("/#/alerts" ++ generateQueryString filter) )
+        AddFilterMatcher emptyMatcherText matcher ->
+            immediatelyFilter filter
+                { model
+                    | matchers =
+                        if List.member matcher model.matchers then
+                            model.matchers
+                        else
+                            model.matchers ++ [ matcher ]
+                    , matcherText =
+                        if emptyMatcherText then
+                            ""
+                        else
+                            model.matcherText
+                }
+
+        DeleteFilterMatcher setMatcherText matcher ->
+            immediatelyFilter filter
+                { model
+                    | matchers = List.filter ((/=) matcher) model.matchers
+                    , matcherText =
+                        if setMatcherText then
+                            Utils.Filter.stringifyMatcher matcher
+                        else
+                            model.matcherText
+                }
+
+        UpdateMatcherText value ->
+            ( { model | matcherText = value }, Cmd.none )
+
+        PressingBackspace isPressed ->
+            ( { model | backspacePressed = isPressed }, Cmd.none )

ui/app/src/Views/AlertList/Views.elm

@@ -1,44 +1,51 @@
 module Views.AlertList.Views exposing (view)
 
 import Alerts.Types exposing (Alert, AlertGroup, Block)
-import Views.AlertList.Types exposing (AlertListMsg(FilterAlerts))
 import Views.AlertList.Filter exposing (silenced, receiver, matchers)
 import Views.AlertList.FilterBar
 import Html exposing (..)
 import Html.Attributes exposing (..)
 import Utils.Date
-import Utils.Types exposing (Filter)
-import Utils.Views exposing (..)
-import Types exposing (Msg(MsgForAlertList, Noop, CreateSilenceFromAlert, UpdateFilter, AddLabel))
+import Utils.Types exposing (ApiResponse(Success, Loading, Failure), Filter)
+import Utils.Filter
+import Utils.Views exposing (buttonLink, onClickMsgButton, listButton)
+import Views.AlertList.Types exposing (AlertListMsg(AddFilterMatcher), Model)
+import Types exposing (Msg(Noop, CreateSilenceFromAlert, MsgForAlertList))
 
 
-view : List AlertGroup -> Filter -> Html Msg -> Html Msg
-view alertGroups filter errorHtml =
+view : Model -> Filter -> Html Msg
+view { alertGroups, matchers, matcherText, backspacePressed } filter =
+    div []
+        [ Views.AlertList.FilterBar.view matchers matcherText backspacePressed
+        , case alertGroups of
+            Success groups ->
+                viewGroups groups filter
+
+            Loading ->
+                Utils.Views.loading
+
+            Failure msg ->
+                Utils.Views.error msg
+        ]
+
+
+viewGroups : List AlertGroup -> Filter -> Html Msg
+viewGroups alertGroups filter =
     let
         filteredGroups =
             receiver filter.receiver alertGroups
                 |> silenced filter.showSilenced
-
-        filterText =
-            Maybe.withDefault "" filter.text
-
-        alertHtml =
-            if List.isEmpty filteredGroups then
-                div [ class "mt2" ] [ text "no alerts found found" ]
-            else
-                ul
-                    [ classList
-                        [ ( "list", True )
-                        , ( "pa0", True )
-                        ]
-                    ]
-                    (List.map alertGroupView filteredGroups)
     in
-        div []
-            [ Views.AlertList.FilterBar.view filterText (Types.UpdateFilter filter) (MsgForAlertList FilterAlerts)
-            , errorHtml
-            , alertHtml
-            ]
+        if List.isEmpty filteredGroups then
+            div [ class "mt2" ] [ text "no alerts found" ]
+        else
+            ul
+                [ classList
+                    [ ( "list", True )
+                    , ( "pa0", True )
+                    ]
+                ]
+                (List.map alertGroupView filteredGroups)
 
 
 alertGroupView : AlertGroup -> Html Msg
@@ -80,10 +87,16 @@ alertView alert =
 
 
 labelButton : ( String, String ) -> Html Msg
-labelButton (( key, value ) as label) =
+labelButton ( key, value ) =
     onClickMsgButton
         (key ++ "=" ++ value)
-        (AddLabel Noop label)
+        (AddFilterMatcher False
+            { key = key
+            , op = Utils.Filter.Eq
+            , value = value
+            }
+            |> MsgForAlertList
+        )
 
 
 alertHeader : ( String, String ) -> Html msg

ui/app/src/Views/SilenceList/Views.elm

@@ -47,7 +47,7 @@ silences silences filter errorHtml =
                     (List.map silenceList silences)
     in
         div []
-            [ textField "Filter" filterText (UpdateFilter filter)
+            [ textField "Filter" filterText UpdateFilter
             , a [ class "f6 link br2 ba ph3 pv2 mr2 dib blue", onClick (MsgForSilenceList FilterSilences) ] [ text "Filter Silences" ]
             , a [ class "f6 link br2 ba ph3 pv2 mr2 dib blue", href "#/silences/new" ] [ text "New Silence" ]
             , errorHtml