mirror of
https://github.com/QuantumPackage/qp2.git
synced 2024-08-30 15:53:42 +02:00
200 lines
5.7 KiB
OCaml
200 lines
5.7 KiB
OCaml
type short_opt = char
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type long_opt = string
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type optional = Mandatory | Optional
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type documentation = string
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type argument = With_arg of string | Without_arg | With_opt_arg of string
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type description = {
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short: short_opt ;
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long : long_opt ;
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opt : optional ;
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doc : documentation ;
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arg : argument ;
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}
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let anon_args = ref []
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and header_doc = ref ""
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and description_doc = ref ""
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and footer_doc = ref ""
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and specs = ref []
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let set_header_doc s = header_doc := s
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let set_description_doc s = description_doc := s
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let set_footer_doc s = footer_doc := s
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(* Hash table containing all the options *)
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let dict = Hashtbl.create 67
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let get_bool x = Hashtbl.mem dict x
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let show_help () = get_bool "help"
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let get x =
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try Some (Hashtbl.find dict x)
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with Not_found -> None
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let anonymous name opt doc =
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{ short=' ' ; long=name; opt; doc; arg=Without_arg; }
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let output_text t =
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Format.printf "@[<v 0>";
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begin
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match Str.split (Str.regexp "\n") t with
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| x :: [] -> Format.printf "@[<hov 0>";
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Str.split (Str.regexp " ") x
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|> List.iter (fun y -> Format.printf "@[%s@]@ " y) ;
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Format.printf "@]"
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| t -> List.iter (fun x ->
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Format.printf "@[<hov 0>";
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Str.split (Str.regexp " ") x
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|> List.iter (fun y -> Format.printf "@[%s@]@ " y) ;
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Format.printf "@]@;") t
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end;
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Format.printf "@]"
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;;
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let output_short x =
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match x.short, x.opt, x.arg with
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| ' ', Mandatory, _ -> Format.printf "@[%s@]" x.long
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| ' ', Optional , _ -> Format.printf "@[[%s]@]" x.long
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| _ , Mandatory, Without_arg -> Format.printf "@[-%c@]" x.short
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| _ , Optional , Without_arg -> Format.printf "@[[-%c]@]" x.short
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| _ , Mandatory, With_arg arg -> Format.printf "@[-%c %s@]" x.short arg
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| _ , Optional , With_arg arg -> Format.printf "@[[-%c %s]@]" x.short arg
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| _ , Mandatory, With_opt_arg arg -> Format.printf "@[-%c [%s]@]" x.short arg
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| _ , Optional , With_opt_arg arg -> Format.printf "@[[-%c [%s]]@]" x.short arg
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let output_long max_width x =
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let arg =
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match x.short, x.arg with
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| ' ' , _ -> x.long
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| _ , Without_arg -> x.long
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| _ , With_arg arg -> Printf.sprintf "%s=%s" x.long arg
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| _ , With_opt_arg arg -> Printf.sprintf "%s[=%s]" x.long arg
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in
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let long =
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let l = String.length arg in
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arg^(String.make (max_width-l) ' ')
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in
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Format.printf "@[<v 0>";
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begin
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match x.short with
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| ' ' -> Format.printf "@[%s @]" long
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| short -> Format.printf "@[-%c --%s @]" short long
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end;
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Format.printf "@]";
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output_text x.doc
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let help () =
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(* Print the header *)
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output_text !header_doc;
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Format.printf "@.@.";
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(* Find the anonymous arguments *)
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let anon =
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List.filter (fun x -> x.short = ' ') !specs
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in
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(* Find the options *)
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let options =
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List.filter (fun x -> x.short <> ' ') !specs
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|> List.sort (fun x y -> Char.compare x.short y.short)
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in
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(* Find column lengths *)
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let max_width =
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List.map (fun x ->
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( match x.arg with
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| Without_arg -> String.length x.long
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| With_arg arg -> String.length x.long + String.length arg
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| With_opt_arg arg -> String.length x.long + String.length arg + 2
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)
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+ ( if x.opt = Optional then 2 else 0)
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) !specs
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|> List.fold_left max 0
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in
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(* Print usage *)
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Format.printf "@[<v>@[<v 2>Usage:@,@,@[<hov 4>@[%s@]" Sys.argv.(0);
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List.iter (fun x -> Format.printf "@ "; output_short x) options;
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Format.printf "@ @[[--]@]";
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List.iter (fun x -> Format.printf "@ "; output_short x;) anon;
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Format.printf "@]@,@]@,";
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(* Print arguments and doc *)
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Format.printf "@[<v 2>Arguments:@,";
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Format.printf "@[<v 0>" ;
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List.iter (fun x -> Format.printf "@ "; output_long max_width x) anon;
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Format.printf "@]@,@]@,";
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(* Print options and doc *)
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Format.printf "@[<v 2>Options:@,";
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Format.printf "@[<v 0>" ;
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List.iter (fun x -> Format.printf "@ "; output_long max_width x) options;
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Format.printf "@]@,@]@,";
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(* Print footer *)
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if !description_doc <> "" then
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begin
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Format.printf "@[<v 2>Description:@,@,";
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output_text !description_doc;
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Format.printf "@,"
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end;
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(* Print footer *)
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output_text !footer_doc;
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Format.printf "@."
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let set_specs specs_in =
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specs := { short='h' ;
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long ="help" ;
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doc ="Prints the help message." ;
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arg =Without_arg ;
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opt =Optional ;
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} :: specs_in;
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let cmd_specs =
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List.filter (fun x -> x.short != ' ') !specs
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|> List.map (fun { short ; long ; opt ; doc ; arg } ->
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match arg with
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| With_arg _ ->
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(short, long, None, Some (fun x -> Hashtbl.replace dict long x) )
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| Without_arg ->
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(short, long, Some (fun () -> Hashtbl.replace dict long ""), None)
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| With_opt_arg _ ->
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(short, long, Some (fun () -> Hashtbl.replace dict long ""),
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Some (fun x -> Hashtbl.replace dict long x) )
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)
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in
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Getopt.parse_cmdline cmd_specs (fun x -> anon_args := !anon_args @ [x]);
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if show_help () then
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(help () ; exit 0);
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(* Check that all mandatory arguments are set *)
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List.filter (fun x -> x.short <> ' ' && x.opt = Mandatory) !specs
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|> List.iter (fun x ->
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match get x.long with
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| Some _ -> ()
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| None -> failwith ("Error: --"^x.long^" option is missing.")
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)
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;;
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let anon_args () = !anon_args
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