1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
module Param = struct
let rec translate : type a. a Ast.Param.t -> a Cmdliner.Arg.conv = function
| Conv { docv; parse; print } -> Cmdliner.Arg.conv ?docv (parse, print)
| String -> Cmdliner.Arg.string
| Int -> Cmdliner.Arg.int
| Float -> Cmdliner.Arg.float
| Bool -> Cmdliner.Arg.bool
| File -> Cmdliner.Arg.file
| Enum { docv = _; choices = hd :: tl; to_string = _ } -> Cmdliner.Arg.enum (hd :: tl)
| Comma_separated param -> Cmdliner.Arg.list ~sep:',' (translate param)
;;
let rec docv : type a. a Ast.Param.t -> string option = function
| Conv { docv; parse = _; print = _ } -> docv
| String -> Some "STRING"
| Int -> Some "INT"
| Float -> Some "FLOAT"
| Bool -> Some "BOOL"
| File -> Some "FILE"
| Enum { docv; choices = _; to_string = _ } -> docv
| Comma_separated param ->
docv param |> Option.map (fun docv -> Printf.sprintf "[%s,..]" docv)
;;
end
module Arg = struct
let docv_of_param ~docv ~param =
match docv with
| Some _ -> docv
| None -> Param.docv param
;;
let fmt_doc ~doc =
let trim = String.trim doc in
let add_dot_suffix =
String.length trim > 0
&&
match trim.[String.length trim - 1] with
| '.' | '?' -> false
| _ -> true
in
if add_dot_suffix then trim ^ "." else trim
;;
let rec doc_of_param : type a. doc:string -> param:a Ast.Param.t -> string =
fun ~doc ~param ->
match (param : _ Ast.Param.t) with
| Conv _ | String | Int | Float | Bool | File -> fmt_doc ~doc
| Enum { docv = _; choices = hd :: tl; to_string = _ } ->
Printf.sprintf
"%s $(docv) must be %s."
(fmt_doc ~doc)
(Cmdliner.Arg.doc_alts_enum ~quoted:true (hd :: tl))
| Comma_separated param -> doc_of_param ~doc:(doc ^ " (comma-separated)") ~param
;;
let rec translate : type a. a Ast.Arg.t -> a Cmdliner.Term.t = function
| Return x -> Cmdliner.Term.const x
| Map { x; f } -> Cmdliner.Term.map f (translate x)
| Both (a, b) -> Cmdliner.Term.product (translate a) (translate b)
| Apply { f; x } -> Cmdliner.Term.app (translate f) (translate x)
| Flag { names = hd :: tl; doc } ->
let doc = fmt_doc ~doc in
Cmdliner.Arg.value (Cmdliner.Arg.flag (Cmdliner.Arg.info ~doc (hd :: tl)))
| Flag_count { names = hd :: tl; doc } ->
let doc = fmt_doc ~doc in
Cmdliner.Arg.value (Cmdliner.Arg.flag_all (Cmdliner.Arg.info ~doc (hd :: tl)))
|> Cmdliner.Term.map List.length
| Named { names = hd :: tl; param; docv; doc } ->
let doc = doc_of_param ~doc ~param in
let docv = docv_of_param ~docv ~param in
Cmdliner.Arg.required
(Cmdliner.Arg.opt
(Cmdliner.Arg.some (Param.translate param))
None
(Cmdliner.Arg.info ?docv ~doc (hd :: tl)))
| Named_multi { names = hd :: tl; param; docv; doc } ->
let doc = doc_of_param ~doc ~param in
let docv = docv_of_param ~docv ~param in
Cmdliner.Arg.value
(Cmdliner.Arg.opt_all
(Param.translate param)
[]
(Cmdliner.Arg.info ?docv ~doc (hd :: tl)))
| Named_opt { names = hd :: tl; param; docv; doc } ->
let doc = doc_of_param ~doc ~param in
let docv = docv_of_param ~docv ~param in
Cmdliner.Arg.value
(Cmdliner.Arg.opt
(Cmdliner.Arg.some (Param.translate param))
None
(Cmdliner.Arg.info ?docv ~doc (hd :: tl)))
| Named_with_default { names = hd :: tl; param; default; docv; doc } ->
let doc = doc_of_param ~doc ~param in
let docv = docv_of_param ~docv ~param in
Cmdliner.Arg.value
(Cmdliner.Arg.opt
(Param.translate param)
default
(Cmdliner.Arg.info ?docv ~doc (hd :: tl)))
| Pos { pos; param; docv; doc } ->
let doc = doc_of_param ~doc ~param in
let docv = docv_of_param ~docv ~param in
Cmdliner.Arg.required
(Cmdliner.Arg.pos
pos
(Cmdliner.Arg.some (Param.translate param))
None
(Cmdliner.Arg.info ?docv ~doc []))
| Pos_opt { pos; param; docv; doc } ->
let doc = doc_of_param ~doc ~param in
let docv = docv_of_param ~docv ~param in
Cmdliner.Arg.value
(Cmdliner.Arg.pos
pos
(Cmdliner.Arg.some (Param.translate param))
None
(Cmdliner.Arg.info ?docv ~doc []))
| Pos_with_default { pos; param; default; docv; doc } ->
let doc = doc_of_param ~doc ~param in
let docv = docv_of_param ~docv ~param in
Cmdliner.Arg.value
(Cmdliner.Arg.pos
pos
(Param.translate param)
default
(Cmdliner.Arg.info ?docv ~doc []))
| Pos_all { param; docv; doc } ->
let doc = doc_of_param ~doc ~param in
let docv = docv_of_param ~docv ~param in
Cmdliner.Arg.value
(Cmdliner.Arg.pos_all
(Param.translate param)
[]
(Cmdliner.Arg.info ?docv ~doc []))
;;
end
module Command = struct
type block = [ `P of string ]
let manpage_of_readme ~readme : block list =
let readme = readme () in
let lines = String.split_on_char '\n' readme in
let paragraphs = Queue.create () in
let buffer = Buffer.create 256 in
let flush_line () =
let line = Buffer.contents buffer in
if not (String.length line = 0)
then (
Queue.push (`P line) paragraphs;
Buffer.clear buffer)
in
let add_separator () = if Buffer.length buffer > 0 then Buffer.add_char buffer ' ' in
let rec loop lines =
match lines with
| [] -> flush_line ()
| "" :: lines ->
flush_line ();
Queue.push (`P "\n") paragraphs;
loop lines
| line :: lines ->
add_separator ();
Buffer.add_string buffer line;
loop lines
in
loop lines;
Queue.fold (fun tl hd -> hd :: tl) [] paragraphs |> List.rev
;;
let rec translate
: type a. ?version:string -> a Ast.Command.t -> name:string -> a Cmdliner.Cmd.t
=
fun ?version command ~name ->
match (command : _ Ast.Command.t) with
| Make { arg; summary; readme } ->
let info =
Cmdliner.Cmd.info
?man:
(readme
|> Option.map (fun readme ->
(manpage_of_readme ~readme :> Cmdliner.Manpage.block list)))
~doc:summary
?version
name
in
Cmdliner.Cmd.v info (Arg.translate arg)
| Group { default; summary; readme; subcommands } ->
let commands = subcommands |> List.map (fun (name, arg) -> translate arg ~name) in
let info =
Cmdliner.Cmd.info
?man:
(readme
|> Option.map (fun readme ->
(manpage_of_readme ~readme :> Cmdliner.Manpage.block list)))
~doc:summary
?version
name
in
Cmdliner.Cmd.group ?default:(default |> Option.map Arg.translate) info commands
;;
end
module To_ast = Cmdlang.Command.Private.To_ast
let param p = p |> To_ast.param |> Param.translate
let arg a = a |> To_ast.arg |> Arg.translate
let command ?version a ~name = a |> To_ast.command |> Command.translate ?version ~name
module Private = struct
module Arg = Arg
module Command = Command
end