From 8c3c5a3ac2dce74b7bbd8c40427ab23ce65bd504 Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Sun, 26 Jan 2020 00:13:53 -0300
Subject: [PATCH] add invert cmd

---
 doc/README.md        |  4 ++++
 examples/invert.scri |  3 +++
 src/lang.zig         |  2 ++
 src/printer.zig      |  1 +
 src/runner.zig       | 10 ++++++++++
 5 files changed, 20 insertions(+)
 create mode 100644 examples/invert.scri

diff --git a/doc/README.md b/doc/README.md
index b3cc13c..cc77cd1 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -288,3 +288,7 @@ GVerb algorithm from SWH plugins.
  - drylevel (dB): -70..0, default 0
  - earlylevel (dB): -70..0, default 0
  - taillevel (dB): -70..0, default -17.5
+
+## `invert split index`
+
+> A utility plugin that inverts the signal, also (wrongly) known as a 180 degree phase shift.
diff --git a/examples/invert.scri b/examples/invert.scri
new file mode 100644
index 0000000..bd7b695
--- /dev/null
+++ b/examples/invert.scri
@@ -0,0 +1,3 @@
+load :0;
+invert 3 1;
+quicksave;
diff --git a/src/lang.zig b/src/lang.zig
index 60bf549..2b022dd 100644
--- a/src/lang.zig
+++ b/src/lang.zig
@@ -36,6 +36,7 @@ pub const CommandType = enum {
     ThruZero,
     Foverdrive,
     Gverb,
+    Invert,
 
     Noise,
     WildNoise,
@@ -201,6 +202,7 @@ pub const Lang = struct {
         _ = try self.keywords.put("thruzero", .ThruZero);
         _ = try self.keywords.put("foverdrive", .Foverdrive);
         _ = try self.keywords.put("gverb", .Gverb);
+        _ = try self.keywords.put("invert", .Invert);
 
         // custom implementations (not lv2)
         _ = try self.keywords.put("noise", .Noise);
diff --git a/src/printer.zig b/src/printer.zig
index 1fb6c68..0d75ea4 100644
--- a/src/printer.zig
+++ b/src/printer.zig
@@ -30,6 +30,7 @@ pub fn printList(list: langs.CommandList, stream: var) !void {
             .ThruZero => "thruzero",
             .Foverdrive => "foverdrive",
             .Gverb => "gverb",
+            .Invert => "invert",
 
             .Noise => "noise",
             .WildNoise => "wildnoise",
diff --git a/src/runner.zig b/src/runner.zig
index 451dac5..dd6d49e 100644
--- a/src/runner.zig
+++ b/src/runner.zig
@@ -344,6 +344,11 @@ pub const Runner = struct {
         try image.runPlugin("http://plugin.org.uk/swh-plugins/gverb", pos, params);
     }
 
+    fn invertCmd(self: *Runner, pos: Position, params: ParamList) !void {
+        var image = try self.getImage();
+        try image.runPlugin("http://plugin.org.uk/swh-plugins/inv", pos, params);
+    }
+
     fn runCommand(self: *Runner, cmd: *lang.Command) !void {
         var params = ParamList.init(self.allocator);
         defer params.deinit();
@@ -629,6 +634,11 @@ pub const Runner = struct {
                 try self.gverbCmd(pos, params);
             },
 
+            .Invert => {
+                const pos = try cmd.consumePosition();
+                try self.gverbCmd(pos, params);
+            },
+
             else => blk: {
                 std.debug.warn("Unsupported command: {}\n", .{cmd.command});
                 break :blk RunError.UnknownCommand;