add support for generic lv2 command running

src/lang.zig

@@ -51,7 +51,7 @@ pub const CommandType = enum {
     Rotate,
 };
 
-pub const Type = enum {
+pub const NewCommandType = enum {
     /// "LV2 Commands" are commands that receive split, index, and then receive
     /// any f64 arguments.
     lv2_command,
@@ -151,6 +151,9 @@ pub const NewCommand = struct {
 
     pub const Amp = struct {
         pub const base_tag = Tag.amp;
+        pub const command_type = NewCommandType.lv2_command;
+        pub const lv2_url = "http://lv2plug.in/plugins/eg-amp";
+
         base: NewCommand,
         split: usize,
         index: usize,
@@ -159,6 +162,9 @@ pub const NewCommand = struct {
 
     pub const RFlanger = struct {
         pub const base_tag = Tag.rflanger;
+        pub const command_type = NewCommandType.lv2_command;
+        pub const lv2_url = "http://plugin.org.uk/swh-plugins/retroFlange";
+
         base: NewCommand,
         split: usize,
         index: usize,

src/runner.zig

@@ -374,6 +374,38 @@ pub const Runner = struct {
         try image.runPlugin("http://calf.sourceforge.net/plugins/VintageDelay", pos, params);
     }
 
+    fn executeLV2Command(self: *@This(), command: var) !void {
+        const pos = plugin.Position{
+            .split = command.split,
+            .index = command.index,
+        };
+
+        var params = ParamList.init(self.allocator);
+        defer params.deinit();
+
+        const typ = @TypeOf(command);
+
+        inline for (@typeInfo(typ).Struct.fields) |cmd_field| {
+            // ignore fields that can't be symbols for lv2 execution
+            comptime {
+                if (std.mem.eql(u8, cmd_field.name, "base") or
+                    std.mem.eql(u8, cmd_field.name, "split") or
+                    std.mem.eql(u8, cmd_field.name, "index"))
+                {
+                    continue;
+                }
+            }
+
+            try params.append(plugin.Param{
+                .sym = cmd_field.name,
+                .value = @field(command, cmd_field.name),
+            });
+        }
+
+        var image = try self.getImage();
+        try image.runPlugin(typ.lv2_url, pos, params);
+    }
+
     fn newRunCommandSingle(
         self: *@This(),
         cmd: lang.NewCommand,
@@ -381,15 +413,36 @@ pub const Runner = struct {
     ) !void {
         comptime const typ = lang.NewCommand.tagToType(tag);
         const command = cmd.cast(typ).?;
-        std.debug.warn("{} {}\n", .{ command.path.ptr, command.path.len });
+        inline for (@typeInfo(typ).Struct.decls) |decl| {
+            comptime {
+                if (!std.mem.eql(u8, decl.name, "command_type")) {
+                    continue;
+                }
+            }
 
-        std.debug.warn("{}\n", .{command});
+            const ctype = typ.command_type;
+            switch (ctype) {
+                .lv2_command => try self.executeLV2Command(command.*),
+                else => @panic("TODO support command type"),
+            }
+        }
     }
 
     fn newRunCommand(self: *@This(), cmd: lang.NewCommand) !void {
+        //            .load => try self.newRunCommandSingle(cmd, .load),
         switch (cmd.tag) {
-            .load => try self.newRunCommandSingle(cmd, .load),
-            else => @panic("TODO"),
+            .load => {
+                const command = cmd.cast(lang.NewCommand.Load).?;
+                try self.loadCmd(command.path);
+            },
+            .quicksave => {
+                try self.quicksaveCmd();
+            },
+            .amp => try self.newRunCommandSingle(cmd, .amp),
+            else => {
+                std.debug.warn("TODO support {}\n", .{@tagName(cmd.tag)});
+                @panic("TODO support tag");
+            },
         }
     }
 
@@ -796,14 +849,6 @@ pub const Runner = struct {
     ) !void {
         for (cmds.items) |cmd| {
             cmd.print();
-
-            switch (cmd.tag) {
-                .load => {
-                    const proper_cmd = cmd.cast(lang.NewCommand.Load).?;
-                    std.debug.warn("got load! {}\n", .{proper_cmd});
-                },
-                else => @panic("TODO"),
-            }
             try self.newRunCommand(cmd.*);
         }
     }