cliphist: add extraOptions option

Add an extraOptions option that would be appended to the cliphist
command.

modules/services/cliphist.nix

@@ -17,6 +17,14 @@ in {
       '';
     };
 
+    extraOptions = lib.mkOption {
+      type = with lib.types; listOf str;
+      default = [ "-max-dedupe-search" "10" "-max-items" "500" ];
+      description = ''
+        Flags to append to the cliphist command.
+      '';
+    };
+
     systemdTarget = lib.mkOption {
       type = lib.types.str;
       default = "graphical-session.target";
@@ -31,7 +39,8 @@ in {
     };
   };
 
-  config = lib.mkIf cfg.enable {
+  config = let extraOptionsStr = lib.escapeShellArgs cfg.extraOptions;
+  in lib.mkIf cfg.enable {
     assertions = [
       (lib.hm.assertions.assertPlatform "services.cliphist" pkgs
         lib.platforms.linux)
@@ -48,7 +57,7 @@ in {
       Service = {
         Type = "simple";
         ExecStart =
-          "${pkgs.wl-clipboard}/bin/wl-paste --watch ${cfg.package}/bin/cliphist store";
+          "${pkgs.wl-clipboard}/bin/wl-paste --watch ${cfg.package}/bin/cliphist ${extraOptionsStr} store";
         Restart = "on-failure";
       };
 
@@ -64,7 +73,7 @@ in {
       Service = {
         Type = "simple";
         ExecStart =
-          "${pkgs.wl-clipboard}/bin/wl-paste --type image --watch ${cfg.package}/bin/cliphist store";
+          "${pkgs.wl-clipboard}/bin/wl-paste --type image --watch ${cfg.package}/bin/cliphist ${extraOptionsStr} store";
         Restart = "on-failure";
       };
 

tests/modules/services/cliphist/cliphist-extra-options.nix

@@ -0,0 +1,24 @@
+{ ... }: {
+  services.cliphist = {
+    enable = true;
+    allowImages = true;
+    extraOptions = [ "-max-dedupe-search" "10" "-max-items" "500" ];
+  };
+
+  test.stubs = {
+    cliphist = { };
+    wl-clipboard = { };
+  };
+
+  nmt.script = ''
+    servicePath=home-files/.config/systemd/user
+
+    assertFileExists $servicePath/cliphist.service
+    assertFileExists $servicePath/cliphist-images.service
+
+    assertFileRegex $servicePath/cliphist.service " '-max-dedupe-search' '10' "
+    assertFileRegex $servicePath/cliphist.service " '-max-items' '500' "
+    assertFileRegex $servicePath/cliphist-images.service " '-max-dedupe-search' '10' "
+    assertFileRegex $servicePath/cliphist-images.service " '-max-items' '500' "
+  '';
+}

tests/modules/services/cliphist/default.nix

@@ -1 +1,4 @@
-{ cliphist-sway-session-target = ./cliphist-sway-session-target.nix; }
+{
+  cliphist-sway-session-target = ./cliphist-sway-session-target.nix;
+  cliphist-extra-options = ./cliphist-extra-options.nix;
+}