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|
(* $Id$ *)
open Printf
type handler =
[ `Command of string
| `Function of (string -> string option) ]
let plugins = Hashtbl.create 20
let add = Hashtbl.replace plugins
let remove = Hashtbl.remove plugins
let exists = Hashtbl.mem plugins
let find = Hashtbl.find plugins
let count_newlines s =
let n = ref 0 in
String.iter (
function
'\n' -> incr n
| _ -> ()
) s;
!n
let expand name s =
let h =
try find name
with Not_found ->
failwith (sprintf "Plugin %s doesn't exist." name)
in
match h with
`Function f -> f s
| `Command cmd ->
let p = Unix.open_process cmd in
let ic, oc = p in
output_string oc s;
close_out oc;
let buf = Buffer.create 1024 in
try
while true do
Buffer.add_string buf (input_line ic);
Buffer.add_char buf '\n'
done;
assert false
with End_of_file ->
match Unix.close_process p with
Unix.WEXITED 0 -> Some (Buffer.contents buf)
| _ -> None
let html_handler =
`Function (fun s -> Some s)
let _ =
add "html" html_handler
let register_command s =
try
let i = String.index s ':' in
let name = String.sub s 0 i in
let cmd = String.sub s (i+1) (String.length s - i - 1) in
if name = "" || cmd = "" then
raise Not_found
else
add name (`Command cmd)
with Not_found ->
failwith (sprintf "Cannot register %S: wrong syntax" s)
|
