From 369408f1274276c53860bd7a0197c770503995e5 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sun, 7 Jun 2015 23:07:55 +0200
Subject: Started work on trivmix service expressions

---
 bragi.nix                  |  3 +++
 custom/trivmix-service.nix | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 custom/trivmix-service.nix

diff --git a/bragi.nix b/bragi.nix
index 8376d70a..bf05dcfa 100644
--- a/bragi.nix
+++ b/bragi.nix
@@ -93,6 +93,9 @@
     };
   };
 
+  systemd.services."mpdmix0" = pkgs.callPackage ./custom/trivmix-service { name = "mpdmix0"; connectOut = "system:playback_3"; };
+  systemd.services."mpdmix1" = pkgs.callPackage ./custom/trivmix-service { name = "mpdmix1"; connectOut = "system:playback_4"; };
+
   services.mpd = {
     enable = true;
     musicDirectory = "/media/odin/music";
diff --git a/custom/trivmix-service.nix b/custom/trivmix-service.nix
new file mode 100644
index 00000000..6fca4649
--- /dev/null
+++ b/custom/trivmix-service.nix
@@ -0,0 +1,42 @@
+{ name
+, run ? null
+, connectOut ? null
+, connectIn ? null
+, trivmix
+, stdenv
+, makeWrapper
+, jack2
+}:
+
+let
+  genRun = if ! isNull run then run else (
+    "${derivRun}/run.sh"
+  );
+  derivRun = stdenv.mkDerivation {
+    name = "trivmix-run";
+    src = ''
+      #!/bin/sh
+
+      ${if ! isNull connectIn then "jack_connect ${connectIn} $1" else ""}
+      ${if ! isNull connectOut then "jack_connect $2 ${connectOut}" else ""}
+    '';
+    unpackPhase = "cat";
+    buildInputs = [ makeWrapper ];
+    buildPhase = ''
+      mkdir -p $out/bin
+      cp $src $out/bin/run.sh
+      chmod 755 $out/bin/run.sh
+      wrapProgram $out/bin/run.sh \
+        --prefix PATH : ${jack2}/bin
+    '';
+  };
+in {
+  wantedBy = [ "sound.target" ];
+  requires = [ "jack.service" ];
+  serviceConfig = {
+    Type = "simple";
+    ExecStart = "${trivmix} --client ${name} --run ${genRun} --dir /run/${name}";
+    User = "jack";
+    Group = "audio";
+  };
+}
-- 
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