add gate cmd

doc/README.md

@@ -178,3 +178,12 @@ with a suffix on the filename (before extension).
 
 Doing consecutive `quicksave`s will not overwrite any files, the suffixes will
 just be different.
+
+## `gate split index switch threshold attack hold decay gaterange` 
+
+ - switch (bool): 0..1, default 0
+ - threshold (dB): -70..12, default -70
+ - attack (ms): 0.1..500, default 30
+ - hold (ms): 5..3000, default 500
+ - decay (ms): 5..4000, default 1000
+ - gaterange (dB): -90..-20, default -90

examples/gate.scri

@@ -0,0 +1,5 @@
+load :0;
+gate 5 1 0 1 100 500 1000 -50;
+gate 5 2 1 1 100 500 1000 -50;
+gate 5 3 1 1 150 1000 1000 -50;
+quicksave;

src/lang.zig

@@ -26,6 +26,7 @@ pub const CommandType = enum {
     Delay,
     Vinyl,
     RevDelay,
+    Gate,
 
     Noise,
     WildNoise,
@@ -184,6 +185,7 @@ pub const Lang = struct {
         _ = try self.keywords.put("delay", .Delay);
         _ = try self.keywords.put("vinyl", .Vinyl);
         _ = try self.keywords.put("revdelay", .RevDelay);
+        _ = try self.keywords.put("gate", .Gate);
 
         // custom implementations (not lv2)
         _ = try self.keywords.put("noise", .Noise);

src/printer.zig

@@ -20,6 +20,7 @@ pub fn printList(list: langs.CommandList, stream: var) !void {
             .Delay => "delay",
             .Vinyl => "vinyl",
             .RevDelay => "revdelay",
+            .Gate => "gate",
 
             .Noise => "noise",
             .WildNoise => "wildnoise",

src/runner.zig

@@ -294,6 +294,11 @@ pub const Runner = struct {
         try magick.runRotate(image, deg, c_bgfill);
     }
 
+    fn gateCmd(self: *Runner, pos: Position, params: ParamList) !void {
+        var image = try self.getImage();
+        try image.runPlugin("http://hippie.lt/lv2/gate", pos, params);
+    }
+
     fn runCommand(self: *Runner, cmd: *lang.Command) !void {
         var params = ParamList.init(self.allocator);
         defer params.deinit();
@@ -477,6 +482,17 @@ pub const Runner = struct {
                 try self.rotateCmd(deg, bgfill);
             },
 
+            .Gate => {
+                const pos = try cmd.consumePosition();
+                try cmd.appendParam(&params, "switch");
+                try cmd.appendParam(&params, "threshold");
+                try cmd.appendParam(&params, "attack");
+                try cmd.appendParam(&params, "hold");
+                try cmd.appendParam(&params, "decay");
+                try cmd.appendParam(&params, "gaterange");
+                try self.gateCmd(pos, params);
+            },
+
             else => blk: {
                 std.debug.warn("Unsupported command: {}\n", .{cmd.command});
                 break :blk RunError.UnknownCommand;