From 221baefb81f65f706683b81fa30fc3654634be93 Mon Sep 17 00:00:00 2001
From: Jeremie Dimino <jeremie@dimino.org>
Date: Sun, 7 May 2017 20:59:29 +0100
Subject: [PATCH] Make subst add the version to the opam file

---
 src/watermarks.ml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/watermarks.ml b/src/watermarks.ml
index 6c84d21c..e3f28128 100644
--- a/src/watermarks.ml
+++ b/src/watermarks.ml
@@ -129,7 +129,14 @@ let subst_string s ~map =
     Some (Buffer.contents buf)
 
 let subst_file fn ~map =
-  match read_file fn |> subst_string ~map with
+  let s = read_file fn in
+  let s =
+    if String.is_suffix fn ~suffix:".opam" then
+      "version: \"%%" ^ "VERSION_NUM" ^ "%%\"\n" ^ s
+    else
+      s
+  in
+  match subst_string s ~map with
   | None -> ()
   | Some s -> write_file fn s