fluidsynth: add module

Fluidsynth is a real-time MIDI synthesizer based on the SoundFont 2
format.

PR #1326

3 files changed, 66 insertions, 0 deletions

diff --git a/modules/misc/news.nix b/modules/misc/news.nix
index b0cdb0bdc66..e56057982f7 100644
--- a/modules/misc/news.nix
+++ b/modules/misc/news.nix
@@ -1568,6 +1568,14 @@ in
           A new module is available: 'programs.powerline-go'
         '';
       }
+
+      {
+        time = "2020-06-14T13:30:19+00:00";
+        condition = hostPlatform.isLinux;
+        message = ''
+          A new module is available: 'service.fluidsynth'
+        '';
+      }
     ];
   };
 }
diff --git a/modules/modules.nix b/modules/modules.nix
index 16ce233e054..14628c767b6 100644
--- a/modules/modules.nix
+++ b/modules/modules.nix
@@ -129,6 +129,7 @@ let
     (loadModule ./services/dwm-status.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/emacs.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/flameshot.nix { })
+    (loadModule ./services/fluidsynth.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/getmail.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/gnome-keyring.nix { })
     (loadModule ./services/gpg-agent.nix { })
diff --git a/modules/services/fluidsynth.nix b/modules/services/fluidsynth.nix
new file mode 100644
index 00000000000..35096115257
--- /dev/null
+++ b/modules/services/fluidsynth.nix
@@ -0,0 +1,57 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.fluidsynth;
+
+in {
+  meta.maintainers = [ maintainers.valodim ];
+
+  options = {
+    services.fluidsynth = {
+      enable = mkEnableOption "fluidsynth, the music player daemon";
+
+      soundFont = mkOption {
+        type = types.path;
+        default = "${pkgs.soundfont-fluid}/share/soundfonts/FluidR3_GM2-2.sf2";
+        description = ''
+          The soundfont file to use, in SoundFont 2 format.
+        '';
+      };
+
+      extraOptions = mkOption {
+        type = types.listOf types.str;
+        default = [ ];
+        example = [ "--sample-rate 96000" ];
+        description = ''
+          Extra arguments, added verbatim to the fluidsynth command. See
+          <citerefentry>
+            <refentrytitle>fluidsynth.conf</refentrytitle>
+            <manvolnum>1</manvolnum>
+          </citerefentry>.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.user.services.fluidsynth = {
+      Unit = {
+        Description = "FluidSynth Daemon";
+        Documentation = "man:fluidsynth(1)";
+        BindsTo = [ "pulseaudio.service" ];
+        After = [ "pulseaudio.service" ];
+      };
+
+      Install = { WantedBy = [ "default.target" ]; };
+
+      Service = {
+        ExecStart = "${pkgs.fluidsynth}/bin/fluidsynth -a pulseaudio -si ${
+            lib.concatStringsSep " " cfg.extraOptions
+          } ${cfg.soundFont}";
+      };
+    };
+  };
+}