sbt-extras: Add update script

pkgs/development/tools/build-managers/sbt-extras/default.nix

@@ -1,12 +1,10 @@
-{ stdenv, fetchFromGitHub, which, curl, makeWrapper, jdk }:
+{ stdenv, fetchFromGitHub, which, curl, makeWrapper, jdk, writeScript
+, common-updater-scripts, cacert, git, nixfmt, nix, jq, coreutils, gnused }:
 
-let
+stdenv.mkDerivation rec {
+  pname = "sbt-extras";
   rev = "1e9230f35879ce23cbd8d16add07d2134fd479c9";
   version = "2020-09-24";
-in
-stdenv.mkDerivation {
-  name = "sbt-extras-${version}";
-  inherit version;
 
   src = fetchFromGitHub {
     owner = "paulp";
@@ -26,14 +24,51 @@ stdenv.mkDerivation {
 
     install bin/sbt $out/bin
 
-    wrapProgram $out/bin/sbt --prefix PATH : ${stdenv.lib.makeBinPath [ which curl ]}
+    wrapProgram $out/bin/sbt --prefix PATH : ${
+      stdenv.lib.makeBinPath [ which curl ]
+    }
   '';
 
+  passthru = {
+    updateScript = writeScript "update.sh" ''
+      #!${stdenv.shell}
+      set -xo errexit
+      PATH=${
+        stdenv.lib.makeBinPath [
+          common-updater-scripts
+          curl
+          cacert
+          git
+          nixfmt
+          nix
+          jq
+          coreutils
+          gnused
+        ]
+      }
+
+      oldVersion="$(nix-instantiate --eval -E "with import ./. {}; lib.getVersion ${pname}" | tr -d '"')"
+      latestSha="$(curl -L -s https://api.github.com/repos/paulp/sbt-extras/commits\?sha\=master\&since\=$oldVersion | jq -r '.[0].sha')"
+
+      if [ ! "null" = "$latestSha" ]; then
+        nixpkgs="$(git rev-parse --show-toplevel)"
+        default_nix="$nixpkgs/pkgs/development/tools/build-managers/sbt-extras/default.nix"
+        latestDate="$(curl -L -s https://api.github.com/repos/paulp/sbt-extras/commits/$latestSha | jq '.commit.committer.date' | sed 's|"\(.*\)T.*|\1|g')"
+        update-source-version ${pname} "$latestSha" --version-key=rev
+        update-source-version ${pname} "$latestDate" --ignore-same-hash
+        nixfmt "$default_nix"
+      else
+        echo "${pname} is already up-to-date"
+      fi
+    '';
+  };
+
   meta = {
-    description = "A more featureful runner for sbt, the simple/scala/standard build tool";
+    description =
+      "A more featureful runner for sbt, the simple/scala/standard build tool";
     homepage = "https://github.com/paulp/sbt-extras";
     license = stdenv.lib.licenses.bsd3;
-    maintainers = with stdenv.lib.maintainers; [ puffnfresh ];
+    maintainers = with stdenv.lib.maintainers; [ nequissimus puffnfresh ];
     platforms = stdenv.lib.platforms.unix;
   };
 }