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input.fs
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module FVim.input
open ui
open log
open neovim
open Avalonia.Input
open System
open System.Runtime.InteropServices
open FSharp.Control.Reactive
open Avalonia.Interactivity
let inline trace fmt = trace "input" fmt
#nowarn "0058"
// notation meaning equivalent decimal value(s) ~
// -----------------------------------------------------------------------------------------------------------------------------------------------------------------------
// <Nul> zero CTRL-@ 0 (stored as 10) *<Nul>*
// <BS> backspace CTRL-H 8 *backspace*
// <Tab> tab CTRL-I 9 *tab* *Tab*
// <NL> linefeed CTRL-J 10 (used for <Nul>) *linefeed*
// <FF> formfeed CTRL-L 12 *formfeed*
// <CR> carriage return CTRL-M 13 *carriage-return*
// <Return> same as <CR> *<Return>*
// <Enter> same as <CR> *<Enter>*
// <Esc> escape CTRL-[ 27 *escape* *<Esc>*
// <Space> space 32 *space*
// <lt> less-than < 60 *<lt>*
// <Bslash> backslash \ 92 *backslash* *<Bslash>*
// <Bar> vertical bar | 124 *<Bar>*
// <Del> delete 127
// <CSI> command sequence intro ALT-Esc 155 *<CSI>*
// <xCSI> CSI when typed in the GUI *<xCSI>*
// <EOL> end-of-line (can be <CR>, <LF> or <CR><LF>, depends on system and 'fileformat') *<EOL>*
// <Up> cursor-up *cursor-up* *cursor_up*
// <Down> cursor-down *cursor-down* *cursor_down*
// <Left> cursor-left *cursor-left* *cursor_left*
// <Right> cursor-right *cursor-right* *cursor_right*
// <S-Up> shift-cursor-up
// <S-Down> shift-cursor-down
// <S-Left> shift-cursor-left
// <S-Right> shift-cursor-right
// <C-Left> control-cursor-left
// <C-Right> control-cursor-right
// <F1> - <F12> function keys 1 to 12 *function_key* *function-key*
// <S-F1> - <S-F12> shift-function keys 1 to 12 *<S-F1>*
// <Help> help key
// <Undo> undo key
// <Insert> insert key
// <Home> home *home*
// <End> end *end*
// <PageUp> page-up *page_up* *page-up*
// <PageDown> page-down *page_down* *page-down*
// <kHome> keypad home (upper left) *keypad-home*
// <kEnd> keypad end (lower left) *keypad-end*
// <kPageUp> keypad page-up (upper right) *keypad-page-up*
// <kPageDown> keypad page-down (lower right) *keypad-page-down*
// <kPlus> keypad + *keypad-plus*
// <kMinus> keypad - *keypad-minus*
// <kMultiply> keypad * *keypad-multiply*
// <kDivide> keypad / *keypad-divide*
// <kEnter> keypad Enter *keypad-enter*
// <kPoint> keypad Decimal point *keypad-point*
// <k0> - <k9> keypad 0 to 9 *keypad-0* *keypad-9*
// <S-...> shift-key *shift* *<S-*
// <C-...> control-key *control* *ctrl* *<C-*
// <M-...> alt-key or meta-key *META* *ALT* *<M-*
// <A-...> same as <M-...> *<A-*
// <D-...> command-key or "super" key *<D-*
let (|HasFlag|_|) (flag: KeyModifiers) (x: KeyModifiers) =
if x.HasFlag flag then Some() else None
let (|NoFlag|_|) (flag: KeyModifiers) (x: KeyModifiers) =
if x.HasFlag flag then None else Some()
let (|DoesntBlockTextInput|_|) (x: KeyModifiers) =
if states.key_altGr && x.HasFlag (KeyModifiers.Alt) && x.HasFlag (KeyModifiers.Control) then Some()
elif x.HasFlag (KeyModifiers.Alt) || x.HasFlag (KeyModifiers.Control) || x.HasFlag (KeyModifiers.Meta) then None
else Some()
let (|NvimSupportedMouseButton|_|) (mb: MouseButton) =
match mb with
| MouseButton.Left | MouseButton.Right | MouseButton.Middle -> Some mb
| _ -> None
let MB (x: MouseButton) =
match x with
| MouseButton.Left -> "left"
| MouseButton.Right -> "right"
| MouseButton.Middle -> "middle"
| _ -> "none"
let DIR (dx: float, dy: float, horizontal: bool) =
match sign dx, sign dy, horizontal with
| -1, _, true -> "right"
| _, _, true -> "left"
| _, -1, false -> "down"
| _, _, false -> "up"
let mutable accumulatedX = 0.0
let mutable accumulatedY = 0.0
let mutable blockNextTextInput = false
// Avoid sending Rejected key as a sequence, e.g. "capslock"
let RejectKeys = set [
Key.None
Key.Clear
Key.Cancel
Key.Pause
Key.CapsLock
Key.Capital
Key.NumLock
Key.HangulMode
Key.KanaMode
Key.JunjaMode
Key.FinalMode
Key.KanjiMode
Key.HanjaMode
Key.Select
Key.Execute
Key.Apps
Key.Print
Key.PrintScreen
Key.Sleep
Key.BrowserBack
Key.BrowserForward
Key.BrowserRefresh
Key.BrowserStop
Key.BrowserSearch
Key.BrowserFavorites
Key.BrowserHome
Key.VolumeUp
Key.VolumeDown
Key.VolumeMute
Key.MediaNextTrack
Key.MediaPreviousTrack
Key.MediaStop
Key.MediaPlayPause
Key.LaunchMail
Key.SelectMedia
Key.LaunchApplication1
Key.LaunchApplication2
Key.Oem8
Key.AbntC1
Key.AbntC2
Key.System
Key.OemAttn
Key.DbeAlphanumeric
Key.OemFinish
Key.DbeKatakana
Key.DbeHiragana
Key.OemCopy
Key.DbeSbcsChar
Key.OemAuto
Key.DbeDbcsChar
Key.OemEnlw
Key.OemBackTab
Key.DbeRoman
Key.DbeNoRoman
Key.Attn
Key.CrSel
Key.DbeEnterWordRegisterMode
Key.ExSel
Key.DbeEnterImeConfigureMode
Key.EraseEof
Key.DbeFlushString
Key.Play
Key.DbeCodeInput
Key.DbeNoCodeInput
Key.Zoom
Key.NoName
Key.DbeDetermineString
Key.DbeEnterDialogConversionMode
Key.Pa1
Key.OemClear
Key.DeadCharProcessed
Key.FnLeftArrow
Key.FnRightArrow
Key.FnUpArrow
Key.FnDownArrow
Key.ImeProcessed
Key.ImeAccept
Key.ImeConvert
Key.ImeNonConvert
Key.ImeModeChange
// filter out pure modifiers
Key.LeftCtrl
Key.RightCtrl
Key.LeftShift
Key.RightShift
Key.LeftAlt
Key.RightAlt
Key.LWin
Key.RWin
]
// Avoid sending unmapped key that also triggers a TextInput
// To match against this set, ensure there's no modifiers or just shift
let TextInputKeys = set [
Key.Space
Key.Oem1
Key.Oem102
Key.Oem2
Key.Oem3
Key.Oem4
Key.Oem5
Key.Oem6
Key.Oem7
Key.OemBackslash
Key.OemCloseBrackets
Key.OemComma
Key.OemMinus
Key.OemOpenBrackets
Key.OemPeriod
Key.OemPipe
Key.OemPlus
Key.OemQuestion
Key.OemQuotes
Key.OemSemicolon
Key.OemTilde
Key.D0
Key.D1
Key.D2
Key.D3
Key.D4
Key.D5
Key.D6
Key.D7
Key.D8
Key.D9
Key.NumPad0
Key.NumPad1
Key.NumPad2
Key.NumPad3
Key.NumPad4
Key.NumPad5
Key.NumPad6
Key.NumPad7
Key.NumPad8
Key.NumPad9
Key.Multiply
Key.Add
Key.Subtract
Key.Divide
Key.Decimal
Key.A
Key.B
Key.C
Key.D
Key.E
Key.F
Key.G
Key.H
Key.I
Key.J
Key.K
Key.L
Key.M
Key.N
Key.O
Key.P
Key.Q
Key.R
Key.S
Key.T
Key.U
Key.V
Key.W
Key.X
Key.Y
Key.Z
]
let (|Special|Normal|Rejected|) (x: InputEvent) =
match x with
| Key(_, k) when RejectKeys.Contains k -> Rejected
| Key(DoesntBlockTextInput, k) when TextInputKeys.Contains k -> Rejected
// !!Note from here on, all TextInput-triggering keys should have been filtered.
// All that survived the purge are either non-textinput-triggering keys, or
// textinput-triggering keys with non-shift modifier active.
// The (possibly unwanted) side effect of this approach is the inconsistency
// between TextInput and modifier-active Key:
//
// | en-US kbd sequence | en result (sent to nvim) | de result (sent to nvim) |
// | ------------------ | ------------------------ | ------------------------ |
// | z | z | y |
// | Ctrl-z | <C-z> | <C-z> |
// | ' | ' | ä |
// | Ctrl-' | <C-'> | <C-'> |
//
| Key(_, Key.Back) -> Special "BS"
| Key(_, Key.Tab) -> Special "Tab"
| Key(_, Key.LineFeed) -> Special "NL"
| Key(_, Key.Return) -> Special "CR"
| Key(_, Key.Escape) -> Special "Esc"
| Key(_, Key.Space) -> Special "Space"
| Key(HasFlag(KeyModifiers.Shift), Key.OemComma) -> Special "LT"
// note, on Windows '\' is recognized as OemPipe but on macOS it's OemBackslash
| Key(NoFlag(KeyModifiers.Shift),
(Key.OemPipe | Key.OemBackslash)) -> Special "Bslash"
| Key(HasFlag(KeyModifiers.Shift),
(Key.OemPipe | Key.OemBackslash)) -> Special "Bar"
| Key(_, Key.Delete) -> Special "Del"
| Key(HasFlag(KeyModifiers.Alt), Key.Escape) -> Special "xCSI"
| Key(_, Key.Up) -> Special "Up"
| Key(_, Key.Down) -> Special "Down"
| Key(_, Key.Left) -> Special "Left"
| Key(_, Key.Right) -> Special "Right"
| Key(_, Key.Help) -> Special "Help"
| Key(_, Key.Insert) -> Special "Insert"
| Key(_, Key.Home) -> Special "Home"
| Key(_, Key.End) -> Special "End"
| Key(_, Key.PageUp) -> Special "PageUp"
| Key(_, Key.PageDown) -> Special "PageDown"
| Key(_, x &
(Key.F1 | Key.F2 | Key.F3 | Key.F4
| Key.F5 | Key.F6 | Key.F7 | Key.F8
| Key.F9 | Key.F10 | Key.F11 | Key.F12
| Key.F13 | Key.F14 | Key.F15 | Key.F16
| Key.F17 | Key.F18 | Key.F19 | Key.F20
| Key.F21 | Key.F22 | Key.F23 | Key.F24)) -> Special(x.ToString())
| Key(NoFlag(KeyModifiers.Shift), x &
(Key.D0 | Key.D1 | Key.D2 | Key.D3
| Key.D4 | Key.D5 | Key.D6 | Key.D7
| Key.D8 | Key.D9)) -> Normal(x.ToString().TrimStart('D'))
| Key(_, x &
(Key.NumPad0 | Key.NumPad1 | Key.NumPad2 | Key.NumPad3
| Key.NumPad4 | Key.NumPad5 | Key.NumPad6 | Key.NumPad7
| Key.NumPad8 | Key.NumPad9)) -> Special("k" + string(x.ToString() |> Seq.last))
| Key(NoFlag(KeyModifiers.Shift), Key.OemComma) -> Normal ","
| Key(NoFlag(KeyModifiers.Shift), Key.OemPeriod) -> Normal "."
| Key(HasFlag(KeyModifiers.Shift), Key.OemPeriod) -> Normal ">"
| Key(NoFlag(KeyModifiers.Shift), Key.Oem2) -> Normal "/"
| Key(HasFlag(KeyModifiers.Shift), Key.Oem2) -> Normal "?"
| Key(NoFlag(KeyModifiers.Shift), Key.OemSemicolon) -> Normal ";"
| Key(HasFlag(KeyModifiers.Shift), Key.OemSemicolon) -> Normal ":"
| Key(NoFlag(KeyModifiers.Shift), Key.OemQuotes) -> Normal "'"
| Key(HasFlag(KeyModifiers.Shift), Key.OemQuotes) -> Normal "\""
| Key(NoFlag(KeyModifiers.Shift), Key.Oem4) -> Normal "["
| Key(HasFlag(KeyModifiers.Shift), Key.Oem4) -> Normal "{"
| Key(NoFlag(KeyModifiers.Shift), Key.OemCloseBrackets) -> Normal "]"
| Key(HasFlag(KeyModifiers.Shift), Key.OemCloseBrackets) -> Normal "}"
| Key(NoFlag(KeyModifiers.Shift), Key.OemMinus) -> Normal "-"
| Key(HasFlag(KeyModifiers.Shift), Key.OemMinus) -> Normal "_"
| Key(NoFlag(KeyModifiers.Shift), Key.OemPlus) -> Normal "="
| Key(HasFlag(KeyModifiers.Shift), Key.OemPlus) -> Normal "+"
| Key(NoFlag(KeyModifiers.Shift), Key.OemTilde) -> Normal "`"
| Key(HasFlag(KeyModifiers.Shift), Key.OemTilde) -> Normal "~"
| Key(HasFlag(KeyModifiers.Shift), Key.D1) -> Normal "!"
| Key(HasFlag(KeyModifiers.Shift), Key.D2) -> Normal "@"
| Key(HasFlag(KeyModifiers.Shift), Key.D3) -> Normal "#"
| Key(HasFlag(KeyModifiers.Shift), Key.D4) -> Normal "$"
| Key(HasFlag(KeyModifiers.Shift), Key.D5) -> Normal "%"
| Key(HasFlag(KeyModifiers.Shift), Key.D6) -> Normal "^"
| Key(HasFlag(KeyModifiers.Shift), Key.D7) -> Normal "&"
| Key(HasFlag(KeyModifiers.Shift), Key.D8) -> Normal "*"
| Key(HasFlag(KeyModifiers.Shift), Key.D9) -> Normal "("
| Key(HasFlag(KeyModifiers.Shift), Key.D0) -> Normal ")"
| Key(_, Key.Multiply) -> Special("kMultiply")
| Key(_, Key.Add) -> Special("kPlus")
| Key(_, Key.Subtract) -> Special("kMinus")
| Key(_, Key.Divide) -> Special("kDivide")
| Key(_, Key.Separator) -> Special("kEnter")
| Key(_, Key.Decimal) -> Special("kPoint")
| Key(NoFlag(KeyModifiers.Shift) as m, x) ->
if RuntimeInformation.IsOSPlatform(OSPlatform.Linux) && m = KeyModifiers.Alt
then blockNextTextInput <- true
Normal (x.ToString().ToLowerInvariant())
| Key(m, x) ->
if RuntimeInformation.IsOSPlatform(OSPlatform.Linux) && m = (KeyModifiers.Alt ||| KeyModifiers.Shift)
then blockNextTextInput <- true
Normal (x.ToString())
| _ -> Rejected
let rec ModifiersPrefix (x: InputEvent) =
match x with
// -------------- keys with special form do not carry shift modifiers
| Key(m & HasFlag(KeyModifiers.Shift), x &
(Key.OemComma | Key.OemPipe | Key.OemBackslash | Key.OemPeriod | Key.Oem2 | Key.OemSemicolon | Key.OemQuotes
| Key.Oem4 | Key.OemCloseBrackets | Key.OemMinus | Key.OemPlus | Key.OemTilde
| Key.D0 | Key.D1 | Key.D2 | Key.D3
| Key.D4 | Key.D5 | Key.D6 | Key.D7
| Key.D8 | Key.D9))
-> ModifiersPrefix <| InputEvent.Key(m &&& (~~~KeyModifiers.Shift), x)
| Key(m & HasFlag(KeyModifiers.Shift), Key.Space) when states.key_disableShiftSpace
-> ModifiersPrefix <| InputEvent.Key(m &&& (~~~KeyModifiers.Shift), Key.Space)
| Key(m, _)
| MousePress(m, _, _, _)
| MouseRelease(m, _, _, _)
| MouseDrag(m, _, _, _)
| MouseWheel(m, _, _, _, _)
->
let c = if m.HasFlag(KeyModifiers.Control) then "C-" else ""
let a = if m.HasFlag(KeyModifiers.Alt) then "A-" else ""
let d = if m.HasFlag(KeyModifiers.Meta) then "D-" else ""
let s = if m.HasFlag(KeyModifiers.Shift) then "S-" else ""
$"{c}{a}{d}{s}".TrimEnd('-')
| TextInput _ -> ""
| _ -> ""
let onInput (nvim: Nvim) (input: IObservable<int*InputEvent*RoutedEventArgs>) =
let key,mouse = input |> Observable.partition(function | _, InputEvent.Key _, _ | _, InputEvent.TextInput _, _ -> true | _ -> false)
// translate to nvim input sequence
let key =
key
|> Observable.choose(fun (_, x, ev) ->
match x with
| TextInput txt ->
ev.Handled <- true
if blockNextTextInput then
blockNextTextInput <- false
None
elif txt = "<" then Some "<LT>"
else Some txt
| InputEvent.Key _ ->
ev.Handled <- true
let pref = ModifiersPrefix x
match x,pref with
| (Special sp), "" -> Some($"<{sp}>")
| (Special sp), pref -> Some($"<{pref}-{sp}>")
| (Normal n), "" -> Some n
| (Normal n), pref -> Some($"<{pref}-{n}>")
| x ->
#if DEBUG
trace "rejected: %A" x
#endif
ev.Handled <- false
None
| _ -> None
)
let mouse =
mouse
|> Observable.choose(fun (gridid, x, ev) ->
ev.Handled <- true
let pref = ModifiersPrefix x
match x with
| MousePress(_, r, c, NvimSupportedMouseButton but) -> Some(gridid, MB but, "press", r, c, 1, pref)
| MouseRelease(_, r, c, NvimSupportedMouseButton but) -> Some(gridid, MB but, "release", r, c, 1, pref)
| MouseDrag(_, r, c, NvimSupportedMouseButton but ) -> Some(gridid, MB but, "drag", r, c, 1, pref)
| MouseWheel(_, r, c, dx, dy) ->
// filter bogus wheel events...
if abs dx >= 10.0 || abs dy >= 10.0 then None
else
// duh! don't like this
accumulatedX <- accumulatedX + dx
accumulatedY <- accumulatedY + dy
let ax, ay = abs accumulatedX, abs accumulatedY
let rpt = max ax ay
let dir = DIR(dx, dy, ax >= ay)
if rpt >= 1.0 then
if ax >= ay then
accumulatedX <- accumulatedX - truncate accumulatedX
else
accumulatedY <- accumulatedY - truncate accumulatedY
Some(gridid, "wheel", dir, r, c, int rpt, pref)
else
None
| _ -> None)
Disposables.compose [
key |> Observable.subscribe(fun x ->
#if DEBUG
trace "OnInput: key: %A" x
#endif
nvim.input x |> ignore
)
mouse |> Observable.subscribe(fun ((grid, but, act, r, c, rep, mods) as ev) ->
#if DEBUG
trace "grid #%d: OnInput: mouse: %A" grid ev
#endif
for _ in 1..rep do
nvim.input_mouse but act mods grid r c |> ignore
)
]