vscode: add args option to keybindings

Also make `when` optional.

modules/programs/vscode.nix

@@ -78,11 +78,19 @@ in {
             };
 
             when = mkOption {
-              type = types.str;
-              default = "";
+              type = types.nullOr (types.str);
+              default = null;
               example = "textInputFocus";
               description = "Optional context filter.";
             };
+
+            # https://code.visualstudio.com/docs/getstarted/keybindings#_command-arguments
+            args = mkOption {
+              type = types.nullOr (types.attrs);
+              default = null;
+              example = { direction = "up"; };
+              description = "Optional arguments for a command.";
+            };
           };
         });
         default = [ ];
@@ -125,12 +133,14 @@ in {
         (k: _: { "${extensionPath}/${k}".source = "${path}/${subDir}/${k}"; })
         (builtins.readDir (path + "/${subDir}"));
       toSymlink = concatMap toPaths cfg.extensions;
+      dropNullFields = filterAttrs (_: v: v != null);
     in foldr (a: b: a // b) {
       "${configFilePath}" = mkIf (cfg.userSettings != { }) {
         source = jsonFormat.generate "vscode-user-settings" cfg.userSettings;
       };
       "${keybindingsFilePath}" = mkIf (cfg.keybindings != [ ]) {
-        source = jsonFormat.generate "vscode-keybindings" cfg.keybindings;
+        source = jsonFormat.generate "vscode-keybindings"
+          (map dropNullFields cfg.keybindings);
       };
     } toSymlink;
   };

tests/modules/programs/vscode/keybindings.nix

@@ -20,6 +20,11 @@ let
       command = "deleteFile";
       when = "explorerViewletVisible";
     }
+    {
+      key = "ctrl+r";
+      command = "run";
+      args = { command = "echo file"; };
+    }
   ];
 
   targetPath = if pkgs.stdenv.hostPlatform.isDarwin then
@@ -43,6 +48,13 @@ let
         "command": "deleteFile",
         "key": "d",
         "when": "explorerViewletVisible"
+      },
+      {
+        "args": {
+          "command": "echo file"
+        },
+        "command": "run",
+        "key": "ctrl+r"
       }
     ]
   '';
@@ -51,18 +63,9 @@ in {
     programs.vscode = {
       enable = true;
       keybindings = bindings;
+      package = pkgs.writeScriptBin "vscode" "" // { pname = "vscode"; };
     };
 
-    nixpkgs.overlays = [
-      (self: super: {
-        vscode = pkgs.runCommandLocal "vscode" { pname = "vscode"; } ''
-          mkdir -p $out/bin
-          touch $out/bin/code
-          chmod +x $out/bin/code;
-        '';
-      })
-    ];
-
     nmt.script = ''
       assertFileExists "home-files/${targetPath}"
       assertFileContent "home-files/${targetPath}" "${expectedJson}"