coqPackages: refactor

pkgs/development/ocaml-modules/elpi/default.nix

@@ -1,15 +1,19 @@
-{ lib, fetchzip, buildDunePackage, camlp5
+{ stdenv, lib, fetchzip, buildDunePackage, camlp5
 , ppxlib, ppx_deriving, re, perl, ncurses
+, version ? "1.12.0"
 }:
-
+with lib;
+let fetched = import ../../../build-support/coq/meta-fetch/default.nix
+  {inherit stdenv fetchzip; } ({
+    release."1.12.0".sha256 = "1agisdnaq9wrw3r73xz14yrq3wx742i6j8i5icjagqk0ypmly2is";
+    release."1.11.4".sha256 = "1m0jk9swcs3jcrw5yyw5343v8mgax238cjb03s8gc4wipw1fn9f5";
+    releaseRev = v: "v${v}";
+    location = { domain = "github.com"; owner = "LPCIC"; repo = "elpi"; };
+  }) version;
+in
 buildDunePackage rec {
   pname = "elpi";
-  version = "1.11.4";
-
-   src = fetchzip {
-     url = "https://github.com/LPCIC/elpi/releases/download/v${version}/elpi-v${version}.tbz";
-     sha256 = "1hmjp2z52j17vwhhdkj45n9jx11jxkdg2dwa0n04yyw0qqy4m7c1";
-   };
+  inherit (fetched) version src;
 
   minimumOCamlVersion = "4.04";
 
@@ -19,8 +23,8 @@ buildDunePackage rec {
 
   meta = {
     description = "Embeddable λProlog Interpreter";
-    license = lib.licenses.lgpl21Plus;
-    maintainers = [ lib.maintainers.vbgl ];
+    license = licenses.lgpl21Plus;
+    maintainers = [ maintainers.vbgl ];
     homepage = "https://github.com/LPCIC/elpi";
   };