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let file =
if Array.length Sys.argv <> 2 then (
Printf.eprintf "usage: ocaml %s <file>\n" Sys.argv.(0);
exit 1
) else
Sys.argv.(1)
let read file =
if Sys.file_exists file then
let ic = open_in_bin file in
Some (input_line ic)
else
None
let write file contents =
let write () =
let oc = open_out file in
output_string oc contents;
output_char oc '\n';
close_out oc in
match read file with
| None -> write ()
| Some actual -> if actual <> contents then write ()
let (/) = Filename.concat
let git file = ".git" / file
let () =
let version_none () =
write file "let version = None" in
match read (git "HEAD") with
| None -> version_none ()
| Some s ->
let reference =
try (* look for "ref: refs/heads/..." *)
let c = String.rindex s ' ' in
let namedref = String.sub s (c+1) (String.length s -c-1) in
read (git namedref)
with Not_found -> (* detached state, .git/HEAD contains sha1 *)
Some s in
match reference with
| None -> version_none ()
| Some sha1 -> write file (Printf.sprintf "let version = Some %S" sha1)