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#!/usr/bin/env ocaml
let get_pkg_name arg =
List.nth (String.split_on_char ':' arg) 0
let get_pkg_deps arg =
String.split_on_char ',' (List.nth (String.split_on_char ':' arg) 1)
let split_pkg arg = get_pkg_name arg, get_pkg_deps arg
let depends_on arg1 arg2 =
let pkg1, deps1 = split_pkg arg1 in
let pkg2, deps2 = split_pkg arg2 in
pkg1 != pkg2 && List.mem pkg2 deps1
let rec sort = function
| [], [] -> []
| [], deferred -> sort (List.rev deferred, [])
| arg :: rest, deferred ->
(* check if any remaining package reverse-depends on this one *)
if List.exists (fun other_arg -> depends_on arg other_arg) rest
then (* defer this package *)
sort (rest, arg :: deferred)
else (* emit this package, and then try again with any deferred packages *)
arg :: sort (List.rev deferred @ rest, [])
let main () =
let args = Array.to_list Sys.argv in
let pkgs = List.tl args in
let sorted_pkgs = sort (pkgs, []) in
Printf.printf "%s\n%!" (String.concat " " (List.map get_pkg_name sorted_pkgs))
let () = main ()
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