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-rw-r--r--src/chart.ml135
-rw-r--r--src/dune3
-rw-r--r--src/grump.ml1
3 files changed, 139 insertions, 0 deletions
diff --git a/src/chart.ml b/src/chart.ml
new file mode 100644
index 0000000..0aee05d
--- /dev/null
+++ b/src/chart.ml
@@ -0,0 +1,135 @@
1exception Empty_list
2let fold fn = function
3 | [] -> raise Empty_list
4 | head :: tail -> List.fold_left fn head tail
5
6let list_min ls = fold Stdlib.min ls
7let list_max ls = fold Stdlib.max ls
8
9let rec repeat n a =
10 if n <= 0
11 then []
12 else a :: repeat (n - 1) a
13
14let empty ls = (ls = [])
15
16let rec zip l1 l2 =
17 match (l1, l2) with
18 | ([], _) -> []
19 | (_, []) -> []
20 | (h1 :: t1, h2 :: t2) -> (h1, h2) :: zip t1 t2
21
22let rec transpose = function
23 | [] :: _ -> []
24 | ls -> List.(map hd ls) :: transpose List.(map tl ls)
25
26let flip f a b = f b a
27
28let rot_right ls = List.(rev ls |> transpose)
29let rot_left ls = List.(transpose ls |> rev)
30
31let to_string c = String.make 1 c
32let space = to_string ' '
33
34let saturating_sub b a =
35 if a < b then 0
36 else a - b
37
38module type Marker = sig
39 type t
40 val of_string : string -> t
41 val to_string : t -> string
42end
43
44module Marker = struct
45 type t = Point
46 | Pixel
47 | Circle
48 | TriangleDown
49 | TriangleUp
50 | TriangleLeft
51 | TriangleRight
52 | Custom of string
53
54 exception Invalid_marker_length
55 let of_string s =
56 if String.length s <> 1
57 then raise Invalid_marker_length
58 else Custom(s)
59
60 let to_string = function
61 | Point -> "."
62 | Pixel -> ","
63 | Circle -> "o"
64 | TriangleDown -> "v"
65 | TriangleUp -> "^"
66 | TriangleLeft -> ">"
67 | TriangleRight -> "<"
68 | Custom(s) -> s
69end
70
71module type ChartOptions = sig
72 type t
73 val default : t
74 val with_height : int -> t -> t
75 val with_marker : string -> t -> t
76end
77
78module ChartOptions = struct
79 type t = { height: int; ascii: bool; marker: Marker.t}
80 let default =
81 { height = 14
82 ; ascii = false
83 ; marker = Marker.Point
84 }
85 let with_height v c = {c with height = v; }
86 let with_marker v c = {c with marker = v; }
87end
88
89module Chart = struct
90 let draw vals (opts: ChartOptions.t) =
91 let height = opts.height in
92 (* let width = List.length vals in *)
93 let min_val = list_min vals in
94 let max_val = list_max vals in
95 (*let range = max_val - min_val in*)
96
97 (* rescale from min-max to 0-height *)
98 let scale v = ((v - min_val) * height) / max_val in
99 let new_vals = List.map scale vals in
100 let rec pad left right s =
101 if left = 0
102 then s :: repeat right space
103 else space :: pad (left - 1) right s
104 in
105 let new_vals' = zip new_vals (List.tl new_vals) in
106 let make_connector s e =
107 match Stdlib.compare s e with
108 | 0 -> pad s (height - s - 1) "-"
109 | x ->
110 let (ltr_chr, rtl_chr) =
111 match x with
112 | 1 -> ("└", "┐")
113 | _ -> ("┘", "┌")
114 in
115 let (st, en) = Stdlib.((min s e, max s e)) in
116 let l = en - st |> saturating_sub 1 in
117 let (left, right) = (repeat st space, repeat (height - l - st - 1) space)
118 in
119 List.flatten [left; [ltr_chr]; repeat l "│"; [rtl_chr]; right]
120 in
121 let m = Marker.to_string opts.marker in
122 let rec make_graph = function
123 | [] -> []
124 | (s, e) :: [] ->
125 pad s (height - s - 1) m
126 :: make_connector s e
127 :: pad e (height - e - 1) m
128 :: []
129 | (s, e) :: tl ->
130 pad s (height - s - 1) m
131 :: make_connector s e
132 :: make_graph tl
133 in
134 make_graph new_vals' |> rot_left
135end
diff --git a/src/dune b/src/dune
new file mode 100644
index 0000000..6b1e6d9
--- /dev/null
+++ b/src/dune
@@ -0,0 +1,3 @@
1(library
2 (name grump)
3 (public_name grump))
diff --git a/src/grump.ml b/src/grump.ml
new file mode 100644
index 0000000..b4b1288
--- /dev/null
+++ b/src/grump.ml
@@ -0,0 +1 @@
print_endline "hello world!"