A lightweight reactive document library.
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open Lwd_infix
open Lwd.Infix
open Notty
open Nottui
let (!$) x = Lwd.join (Lwd.get x)
let empty_lwd = Lwd.return Ui.empty
let string ?(attr=A.empty) str =
let control_character_index str i =
let len = String.length str in
let i = ref i in
while let i = !i in i < len && str.[i] >= ' ' do
incr i;
done;
if !i = len then raise Not_found;
!i
in
let rec split str i =
match control_character_index str i with
| j ->
let img = I.string attr (String.sub str i (j - i)) in
img :: split str (j + 1)
| exception Not_found ->
[I.string attr
(if i = 0 then str
else String.sub str i (String.length str - i))]
in
Ui.atom (I.vcat (split str 0))
let int ?attr x = string ?attr (string_of_int x)
let bool ?attr x = string ?attr (string_of_bool x)
let float_ ?attr x = string ?attr (string_of_float x)
let printf ?attr fmt =
Printf.ksprintf (string ?attr) fmt
let fmt ?attr fmt =
Format.kasprintf (string ?attr) fmt
let kprintf k ?attr fmt =
Printf.ksprintf (fun str -> k (string ?attr str)) fmt
let kfmt k ?attr fmt =
Format.kasprintf (fun str -> k (string ?attr str)) fmt
let attr_menu_main = A.(bg green ++ fg black)
let attr_menu_sub = A.(bg lightgreen ++ fg black)
let menu_overlay ?dx ?dy handler t =
ignore (dx, dy, handler, t);
assert false
(*let placeholder = Lwd.return (Ui.atom (I.void 1 0)) in
let body = Lwd_utils.pack Ui.pack_x [placeholder; t; placeholder] in
let bg = Lwd.map' body @@ fun t ->
let {Ui. w; h; _} = Ui.layout_spec t in
Ui.atom (I.char A.(bg lightgreen) ' ' w h)
in
Lwd.map (Ui.overlay ?dx ?dy ~handler) (Lwd_utils.pack Ui.pack_z [bg; body])*)
let scroll_step = 1
type scroll_state = {
position: int;
bound : int;
visible : int;
total : int;
}
let default_scroll_state = { position = 0; bound = 0; visible = 0; total = 0 }
let vscroll_area ~state ~change t =
let visible = ref (-1) in
let total = ref (-1) in
let scroll state delta =
let position = state.position + delta in
let position = max 0 (min state.bound position) in
if position <> state.position then
change `Action {state with position};
`Handled
in
let focus_handler state = function
(*| `Arrow `Left , _ -> scroll (-scroll_step) 0*)
(*| `Arrow `Right, _ -> scroll (+scroll_step) 0*)
| `Arrow `Up , [] -> scroll state (-scroll_step)
| `Arrow `Down , [] -> scroll state (+scroll_step)
| `Page `Up, [] -> scroll state ((-scroll_step) * 8)
| `Page `Down, [] -> scroll state ((+scroll_step) * 8)
| _ -> `Unhandled
in
let scroll_handler state ~x:_ ~y:_ = function
| `Scroll `Up -> scroll state (-scroll_step)
| `Scroll `Down -> scroll state (+scroll_step)
| _ -> `Unhandled
in
Lwd.map2' t state @@ fun t state ->
t
|> Ui.scroll_area 0 state.position
|> Ui.resize ~h:0 ~sh:1
|> Ui.size_sensor (fun ~w:_ ~h ->
let tchange =
if !total <> (Ui.layout_spec t).Ui.h
then (total := (Ui.layout_spec t).Ui.h; true)
else false
in
let vchange =
if !visible <> h
then (visible := h; true)
else false
in
if tchange || vchange then
change `Content {state with visible = !visible; total = !total;
bound = max 0 (!total - !visible); }
)
|> Ui.mouse_area (scroll_handler state)
|> Ui.keyboard_area (focus_handler state)
let scroll_area ?(offset=0,0) t =
let offset = Lwd.var offset in
let scroll d_x d_y =
let s_x, s_y = Lwd.peek offset in
let s_x = max 0 (s_x + d_x) in
let s_y = max 0 (s_y + d_y) in
Lwd.set offset (s_x, s_y);
`Handled
in
let focus_handler = function
| `Arrow `Left , [] -> scroll (-scroll_step) 0
| `Arrow `Right, [] -> scroll (+scroll_step) 0
| `Arrow `Up , [] -> scroll 0 (-scroll_step)
| `Arrow `Down , [] -> scroll 0 (+scroll_step)
| `Page `Up, [] -> scroll 0 ((-scroll_step) * 8)
| `Page `Down, [] -> scroll 0 ((+scroll_step) * 8)
| _ -> `Unhandled
in
let scroll_handler ~x:_ ~y:_ = function
| `Scroll `Up -> scroll 0 (-scroll_step)
| `Scroll `Down -> scroll 0 (+scroll_step)
| _ -> `Unhandled
in
Lwd.map2' t (Lwd.get offset) @@ fun t (s_x, s_y) ->
t
|> Ui.scroll_area s_x s_y
|> Ui.mouse_area scroll_handler
|> Ui.keyboard_area focus_handler
let main_menu_item text f =
let text = string ~attr:attr_menu_main (" " ^ text ^ " ") in
let v = Lwd.var empty_lwd in
let visible = ref false in
let on_click ~x:_ ~y:_ = function
| `Left ->
visible := not !visible;
if not !visible then (
v $= Lwd.return Ui.empty
) else (
let h ~x:_ ~y:_ = function
| `Left ->
visible := false; v $= Lwd.return Ui.empty; `Unhandled
| _ -> `Unhandled
in
v $= menu_overlay h (f ())
);
`Handled
| _ -> `Unhandled
in
Lwd_utils.pack Ui.pack_y [
Lwd.return (Ui.mouse_area on_click text);
Lwd.join (Lwd.get v)
]
let sub_menu_item text f =
let text = string ~attr:attr_menu_sub text in
let v = Lwd.var empty_lwd in
let visible = ref false in
let on_click ~x:_ ~y:_ = function
| `Left ->
visible := not !visible;
if not !visible then (
v $= Lwd.return Ui.empty
) else (
let h ~x:_ ~y:_ = function
| `Left ->
visible := false; v $= Lwd.return Ui.empty; `Unhandled
| _ -> `Unhandled
in
v $= menu_overlay h (f ())
);
`Handled
| _ -> `Unhandled
in
Lwd_utils.pack Ui.pack_x [
Lwd.return (Ui.mouse_area on_click text);
Lwd.join (Lwd.get v)
]
let sub_entry text f =
let text = string ~attr:attr_menu_sub text in
let on_click ~x:_ ~y:_ = function
| `Left -> f (); `Handled
| _ -> `Unhandled
in
Ui.mouse_area on_click text
let v_pane left right =
let w = ref 10 in
let h = ref 10 in
let split = ref 0.5 in
let splitter = Lwd.var empty_lwd in
let splitter_bg = Lwd.var Ui.empty in
let left_pane = Lwd.var empty_lwd in
let right_pane = Lwd.var empty_lwd in
let node = Lwd_utils.pack Ui.pack_y [!$left_pane; !$splitter; !$right_pane] in
let render () =
let split = int_of_float (!split *. float !h) in
let split = min (!h - 1) (max split 0) in
left_pane $= Lwd.map' left
(fun t -> Ui.resize ~w:!w ~h:split t);
right_pane $= Lwd.map' right
(fun t -> Ui.resize ~w:!w ~h:(!h - split - 1) t);
splitter_bg $= Ui.atom (I.char A.(bg lightyellow) ' ' !w 1);
in
let action ~x:_ ~y:_ = function
| `Left ->
let y0 = int_of_float (!split *. float !h) in
`Grab ((fun ~x:_ ~y ->
let y0' = y0 + y in
split := min 1.0 (max 0.0 (float y0' /. float !h));
render ()
), (fun ~x:_ ~y:_ -> ()))
| _ -> `Unhandled
in
splitter $= Lwd.map (Ui.mouse_area action) (Lwd.get splitter_bg);
render ();
let on_resize ~w:ew ~h:eh =
if !w <> ew || !h <> eh then (
w := ew; h := eh;
render ()
)
in
Lwd.map' node @@ fun t ->
Ui.size_sensor on_resize (Ui.resize ~w:10 ~h:10 ~sw:1 ~sh:1 t)
type pane_state =
| Split of { pos: int; max: int }
| Re_split of { pos: int; max: int; at: int }
let h_pane l r =
let state_var = Lwd.var (Split {pos = 5; max = 10}) in
let render state (l, r) =
let (Split {pos; max} | Re_split {pos; max; _}) = state in
let l = Ui.resize ~w:0 ~h:0 ~sh:1 ~sw:pos l in
let r = Ui.resize ~w:0 ~h:0 ~sh:1 ~sw:(max - pos) r in
let splitter =
Ui.resize ~bg:Notty.A.(bg lightyellow) ~w:1 ~h:0 ~sw:0 ~sh:1 Ui.empty
in
let splitter =
Ui.mouse_area (fun ~x:_ ~y:_ -> function
| `Left ->
`Grab (
(fun ~x ~y:_ ->
match Lwd.peek state_var with
| Split {pos; max} ->
Lwd.set state_var (Re_split {pos; max; at = x})
| Re_split {pos; max; at} ->
if at <> x then
Lwd.set state_var (Re_split {pos; max; at = x})
),
(fun ~x:_ ~y:_ -> ())
)
| _ -> `Unhandled
) splitter
in
let ui = Ui.join_x l (Ui.join_x splitter r) in
let ui = Ui.resize ~w:10 ~h:10 ~sw:1 ~sh:1 ui in
let ui = match state with
| Split _ -> ui
| Re_split {at; _} ->
Ui.transient_sensor (fun ~x ~y:_ ~w ~h:_ () ->
Lwd.set state_var (Split {pos = (at - x); max = w})
) ui
in
ui
in
Lwd.map2 render (Lwd.get state_var) (Lwd.pair l r)
(*type pane_state =
| Static of { w : int; h : int; split : float }
| Resizing of { w : int; h : int; split : float; x : int; y : int; }
let pane_h (Static {h; _} | Resizing {h; _}) = h
let pane_w (Static {w; _} | Resizing {w; _}) = w
let pane_split (Static {split; _} | Resizing {split; _}) = split
let h_pane l r =
let state_var = Lwd.var (Static {w = 0; h = 0 ; split = 0.5}) in
let render state (l, r) =
let h = pane_h state in
let split = int_of_float (pane_split state *. float (pane_w state)) in
let l = Ui.resize ~w:split ~h l in
let r = Ui.resize ~w:(pane_w state - split - 1) ~h r in
let splitter = Ui.atom (Notty.I.char Notty.A.(bg lightyellow) ' ' 1 h) in
let splitter =
Ui.mouse_area (fun ~x:_ ~y:_ -> function
| `Left ->
`Grab (
(fun ~x ~y:_ ->
match Lwd.peek state_var with
| Static {w; h; split} ->
Lwd.set state_var (Resizing {x = min_int; y = min_int; w; h; split})
| Resizing r ->
if r.x > min_int then
let split = float (x - r.x) /. float r.w in
Lwd.set state_var (Resizing {r with split})
),
(fun ~x:_ ~y:_ ->
match Lwd.peek state_var with
| Static _ -> ()
| Resizing {w; h; split; _} ->
Lwd.set state_var (Static {w; h; split})
)
)
| _ -> `Unhandled
) splitter
in
let ui = Ui.join_x l (Ui.join_x splitter r) in
let ui = Ui.resize ~w:10 ~h:10 ~sw:1 ~sh:1 ui in
let ui = match state with
| Static _ ->
Ui.size_sensor (fun ~w ~h ->
match Lwd.peek state_var with
| Static r ->
if r.w <> w || r.h <> h then
Lwd.set state_var (Static {r with w; h})
| Resizing _ -> ()
) ui
| Resizing _ ->
Ui.permanent_sensor (fun ~x ~y ~w ~h ->
match Lwd.peek state_var with
| Static _ -> ignore
| Resizing r ->
if r.x <> x || r.y <> y || r.w <> w || r.h <> h then
Lwd.set state_var (Resizing {x; y; w; h; split = r.split});
ignore
) ui
in
ui
in
Lwd.map2 render (Lwd.get state_var) (Lwd.pair l r)*)
let sub' str p l =
if p = 0 && l = String.length str
then str
else String.sub str p l
let edit_field ?(focus=Focus.make()) state ~on_change ~on_submit =
let update focus_h focus (text, pos) =
let pos = min (max 0 pos) (String.length text) in
let content =
Ui.atom @@ I.hcat @@
if Focus.has_focus focus then (
let attr = A.(bg lightblue) in
let len = String.length text in
(if pos >= len
then [I.string attr text]
else [I.string attr (sub' text 0 pos)])
@
(if pos < String.length text then
[I.string A.(bg lightred) (sub' text pos 1);
I.string attr (sub' text (pos + 1) (len - pos - 1))]
else [I.string A.(bg lightred) " "]);
) else
[I.string A.(st underline) (if text = "" then " " else text)]
in
let handler = function
| `ASCII 'U', [`Ctrl] -> on_change ("", 0); `Handled (* clear *)
| `Escape, [] -> Focus.release focus_h; `Handled
| `ASCII k, _ ->
let text =
if pos < String.length text then (
String.sub text 0 pos ^ String.make 1 k ^
String.sub text pos (String.length text - pos)
) else (
text ^ String.make 1 k
)
in
on_change (text, (pos + 1));
`Handled
| `Backspace, _ ->
let text =
if pos > 0 then (
if pos < String.length text then (
String.sub text 0 (pos - 1) ^
String.sub text pos (String.length text - pos)
) else if String.length text > 0 then (
String.sub text 0 (String.length text - 1)
) else text
) else text
in
let pos = max 0 (pos - 1) in
on_change (text, pos);
`Handled
| `Enter, _ -> on_submit (text, pos); `Handled
| `Arrow `Left, [] ->
let pos = min (String.length text) pos in
if pos > 0 then (
on_change (text, pos - 1);
`Handled
)
else `Unhandled
| `Arrow `Right, [] ->
let pos = pos + 1 in
if pos <= String.length text
then (on_change (text, pos); `Handled)
else `Unhandled
| _ -> `Unhandled
in
Ui.keyboard_area ~focus handler content
in
let node =
Lwd.map2 (update focus) (Focus.status focus) state
in
let mouse_grab (text, pos) ~x ~y:_ = function
| `Left ->
if x <> pos then on_change (text, x);
Nottui.Focus.request focus;
`Handled
| _ -> `Unhandled
in
Lwd.map2' state node @@ fun state content ->
Ui.mouse_area (mouse_grab state) content
(** Tab view, where exactly one element of [l] is shown at a time. *)
let tabs (tabs: (string * (unit -> Ui.t Lwd.t)) list) : Ui.t Lwd.t =
match tabs with
| [] -> Lwd.return Ui.empty
| _ ->
let cur = Lwd.var 0 in
Lwd.get cur >>= fun idx_sel ->
let _, f = List.nth tabs idx_sel in
let tab_bar =
tabs
|> List.mapi
(fun i (s,_) ->
let attr = if i = idx_sel then A.(st underline) else A.empty in
let tab_annot = printf ~attr "[%s]" s in
Ui.mouse_area
(fun ~x:_ ~y:_ l -> if l=`Left then (Lwd.set cur i; `Handled) else `Unhandled)
tab_annot)
|> Ui.hcat
in
f() >|= Ui.join_y tab_bar
(** Horizontal/vertical box. We fill lines until there is no room,
and then go to the next ligne. All widgets in a line are considered to
have the same height.
@param width dynamic width (default 80)
*)
let flex_box ?(w=Lwd.return 80) (l: Ui.t Lwd.t list) : Ui.t Lwd.t =
Lwd_utils.flatten_l l >>= fun l ->
w >|= fun w_limit ->
let rec box_render (acc:Ui.t) (i:int) l : Ui.t =
match l with
| [] -> acc
| ui0 :: tl ->
let w0 = (Ui.layout_spec ui0).Ui.w in
if i + w0 >= w_limit then (
(* newline starting with ui0 *)
Ui.join_y acc (box_render ui0 w0 tl)
) else (
(* same line *)
box_render (Ui.join_x acc ui0) (i+w0) tl
)
in
box_render Ui.empty 0 l
(** Prints the summary, but calls [f()] to compute a sub-widget
when clicked on. Useful for displaying deep trees. *)
let unfoldable ?(folded_by_default=true) summary (f: unit -> Ui.t Lwd.t) : Ui.t Lwd.t =
let open Lwd.Infix in
let opened = Lwd.var (not folded_by_default) in
let fold_content =
Lwd.get opened >>= function
| true ->
(* call [f] and pad a bit *)
f() |> Lwd.map (Ui.join_x (string " "))
| false -> empty_lwd
in
(* pad summary with a "> " when it's opened *)
let summary =
Lwd.get opened >>= fun op ->
summary >|= fun s ->
Ui.hcat [string ~attr:A.(bg blue) (if op then "v" else ">"); string " "; s]
in
let cursor ~x:_ ~y:_ = function
| `Left when Lwd.peek opened -> Lwd.set opened false; `Handled
| `Left -> Lwd.set opened true; `Handled
| _ -> `Unhandled
in
let mouse = Lwd.map (fun m -> Ui.mouse_area cursor m) summary in
Lwd.map2
(fun summary fold ->
(* TODO: make this configurable/optional *)
(* newline if it's too big to fit on one line nicely *)
let spec_sum = Ui.layout_spec summary in
let spec_fold = Ui.layout_spec fold in
(* TODO: somehow, probe for available width here? *)
let too_big =
spec_fold.Ui.h > 1 ||
(spec_fold.Ui.h>0 && spec_sum.Ui.w + spec_fold.Ui.w > 60)
in
if too_big
then Ui.join_y summary (Ui.join_x (string " ") fold)
else Ui.join_x summary fold)
mouse fold_content
let hbox l = Lwd_utils.pack Ui.pack_x l
let vbox l = Lwd_utils.pack Ui.pack_y l
let zbox l = Lwd_utils.pack Ui.pack_z l
let vlist ?(bullet="- ") (l: Ui.t Lwd.t list) : Ui.t Lwd.t =
l
|> List.map (fun ui -> Lwd.map (Ui.join_x (string bullet)) ui)
|> Lwd_utils.pack Ui.pack_y
(** A list of items with a dynamic filter on the items *)
let vlist_with
?(bullet="- ")
?(filter=Lwd.return (fun _ -> true))
(f:'a -> Ui.t Lwd.t)
(l:'a list Lwd.t) : Ui.t Lwd.t =
let open Lwd.Infix in
let rec filter_map_ acc f l =
match l with
| [] -> List.rev acc
| x::l' ->
let acc' = match f x with | None -> acc | Some y -> y::acc in
filter_map_ acc' f l'
in
let l = l >|= List.map (fun x -> x, Lwd.map (Ui.join_x (string bullet)) @@ f x) in
let l_filter : _ list Lwd.t =
filter >>= fun filter ->
l >|=
filter_map_ []
(fun (x,ui) -> if filter x then Some ui else None)
in
l_filter >>= Lwd_utils.pack Ui.pack_y
let rec iterate n f x =
if n=0 then x else iterate (n-1) f (f x)
(** A grid layout, with alignment in all rows/columns.
@param max_h maximum height of a cell
@param max_w maximum width of a cell
@param bg attribute for controlling background style
@param h_space horizontal space between each cell in a row
@param v_space vertical space between each row
@param fill used to control filling of cells
@param crop used to control cropping of cells
TODO: control padding/alignment, vertically and horizontally
TODO: control align left/right in cells
TODO: horizontal rule below headers
TODO: headers *)
let grid
?max_h ?max_w
?fill ?crop ?bg
?(h_space=0)
?(v_space=0)
?(headers:Ui.t Lwd.t list option)
(rows: Ui.t Lwd.t list list) : Ui.t Lwd.t =
let rows = match headers with
| None -> rows
| Some r -> r :: rows
in
(* build a [ui list list Lwd.t] *)
begin
Lwd_utils.map_l (fun r -> Lwd_utils.flatten_l r) rows
end >>= fun (rows:Ui.t list list) ->
(* determine width of each column and height of each row *)
let n_cols = List.fold_left (fun n r -> max n (List.length r)) 0 rows in
let col_widths = Array.make n_cols 1 in
List.iter
(fun row ->
List.iteri
(fun col_j cell ->
let w = (Ui.layout_spec cell).Ui.w in
col_widths.(col_j) <- max col_widths.(col_j) w)
row)
rows;
begin match max_w with
| None -> ()
| Some max_w ->
(* limit width *)
Array.iteri (fun i x -> col_widths.(i) <- min x max_w) col_widths
end;
(* now render, with some padding *)
let pack_pad_x =
if h_space<=0 then (Ui.empty, Ui.join_x)
else (Ui.empty, (fun x y -> Ui.hcat [x; Ui.void h_space 0; y]))
and pack_pad_y =
if v_space =0 then (Ui.empty, Ui.join_y)
else (Ui.empty, (fun x y -> Ui.vcat [x; Ui.void v_space 0; y]))
in
let rows =
List.map
(fun row ->
let row_h =
List.fold_left (fun n c -> max n (Ui.layout_spec c).Ui.h) 0 row
in
let row_h = match max_h with
| None -> row_h
| Some max_h -> min row_h max_h
in
let row =
List.mapi
(fun i c ->
Ui.resize ~w:col_widths.(i) ~h:row_h ?crop ?fill ?bg c)
row
in
Lwd_utils.pure_pack pack_pad_x row)
rows
in
(* TODO: mouse and keyboard handling *)
let ui = Lwd_utils.pure_pack pack_pad_y rows in
Lwd.return ui
let button ?attr s f =
Ui.mouse_area (fun ~x:_ ~y:_ _ -> f(); `Handled) (string ?attr s)
(* file explorer for selecting a file *)
let file_select
?(abs=false)
?filter
~(on_select:string -> unit) () : Ui.t Lwd.t =
let rec aux ~fold path =
try
let p_rel = if path = "" then "." else path in
if Sys.is_directory p_rel then (
let ui() =
let arr = Sys.readdir p_rel in
let l = Array.to_list arr |> List.map (Filename.concat path) in
(* apply potential filter *)
let l = match filter with None -> l | Some f -> List.filter f l in
let l = Lwd.return @@ List.sort String.compare l in
vlist_with ~bullet:"" (aux ~fold:true) l
in
if fold then (
unfoldable ~folded_by_default:true
(Lwd.return @@ string @@ path ^ "/") ui
) else ui ()
) else (
Lwd.return @@
button ~attr:A.(st underline) path (fun () -> on_select path)
)
with e ->
Lwd.return @@ Ui.vcat [
printf ~attr:A.(bg red) "cannot list directory %s" path;
string @@ Printexc.to_string e;
]
in
let start = if abs then Sys.getcwd () else "" in
aux ~fold:false start
let toggle, toggle' =
let toggle_ st (lbl:string Lwd.t) (f:bool -> unit) : Ui.t Lwd.t =
let mk_but st_v lbl_v =
let lbl = Printf.sprintf "[%s|%s]" lbl_v (if st_v then "" else "×");in
button lbl (fun () ->
let new_st = not st_v in
Lwd.set st new_st; f new_st)
in
Lwd.map2 mk_but (Lwd.get st) lbl
in
(* Similar to {!toggle}, except it directly reflects the state of a variable. *)
let toggle' (lbl:string Lwd.t) (v:bool Lwd.var) : Ui.t Lwd.t =
toggle_ v lbl (Lwd.set v)
(* a toggle, with a true/false state *)
and toggle ?(init=false) (lbl:string Lwd.t) (f:bool -> unit) : Ui.t Lwd.t =
let st = Lwd.var init in
toggle_ st lbl f
in
toggle, toggle'