From 8b189914f703ae4c502a8efd5d013c451bc7d607 Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Wed, 10 Jul 2019 13:24:03 -0300
Subject: [PATCH] add rflanger command, update readme

---
 README.md                | 12 +++++++++---
 doc/README.md            |  4 ++++
 examples/flanger.scri    |  3 +++
 examples/middle_amp.scri |  4 ++--
 src/lang.zig             |  4 ++++
 src/runner.zig           | 33 ++++++++++++++++++++++++++++++++-
 6 files changed, 54 insertions(+), 6 deletions(-)
 create mode 100644 examples/flanger.scri

diff --git a/README.md b/README.md
index 4a4c010..629374c 100644
--- a/README.md
+++ b/README.md
@@ -3,16 +3,22 @@ scritcher
 
 glitch art "framework", ???????? language??? something?
 
+![example of the amp command](https://estrogen.fun/i/57y7kn55.png)
+
+![example of the rflanger command](https://estrogen.fun/i/i2055hdf.png)
+
 # how do?
 
-currently it can't do much other than running the eg-amp default lv2 plugin.
-
-depedencies:
+## build depedencies:
  - zig at https://ziglang.org
  - libc, lilv and libsndfile
  - an appreciation for glitched anime girls on your hard drive
  - optional: imagemagick to convert from whatever to bmp
 
+## plugin depedencies:
+ - lv2 default plugins (most specifically the eg-amp plugin)
+ - the SWH plugins ( https://github.com/swh/lv2 )
+
 ```bash
 # build and install
 # assumes lilv headers are at /usr/include/lilv-0, check build.zig if different
diff --git a/doc/README.md b/doc/README.md
index 8ad22b7..5895910 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -32,6 +32,10 @@ be a bmp. feel free to put other files, no warranties are given.)
 
 Run the eg-amp plugin over the given slice of the file.
 
+## `rflanger split index delay_depth_avg law_freq`
+
+Runs the Retro Flanger script from the SWH plugins.
+
 ## TODO `echo split index delay`
 
 Run an echo filter on the given loaded file.
diff --git a/examples/flanger.scri b/examples/flanger.scri
new file mode 100644
index 0000000..f1fe18d
--- /dev/null
+++ b/examples/flanger.scri
@@ -0,0 +1,3 @@
+load :0;
+rflanger 3 1 2.5 1;
+quicksave;
diff --git a/examples/middle_amp.scri b/examples/middle_amp.scri
index e1eed36..a1ed655 100644
--- a/examples/middle_amp.scri
+++ b/examples/middle_amp.scri
@@ -1,8 +1,8 @@
 load :0;
-amp 5 1 8;
-amp 7 4 2;
 amp 80 70 10;
 amp 80 73 20;
 amp 80 75 20;
 amp 80 76 20;
+amp 7 4 2;
+amp 5 1 8;
 quicksave;
diff --git a/src/lang.zig b/src/lang.zig
index ed5b402..f3c9c71 100644
--- a/src/lang.zig
+++ b/src/lang.zig
@@ -10,6 +10,7 @@ pub const CommandType = enum {
     Noop,
     Load,
     Amp,
+    RFlanger,
     Quicksave,
 };
 
@@ -52,12 +53,15 @@ pub const CommandList = std.ArrayList(*Command);
 pub const ArgList = std.ArrayList([]const u8);
 
 pub fn commandToCmdType(command: []const u8) ParseError!CommandType {
+    // TODO make a hashmap for those
     if (std.mem.eql(u8, command, "noop")) {
         return CommandType.Noop;
     } else if (std.mem.eql(u8, command, "load")) {
         return CommandType.Load;
     } else if (std.mem.eql(u8, command, "amp")) {
         return CommandType.Amp;
+    } else if (std.mem.eql(u8, command, "rflanger")) {
+        return CommandType.RFlanger;
     } else if (std.mem.eql(u8, command, "quicksave")) {
         return CommandType.Quicksave;
     } else {
diff --git a/src/runner.zig b/src/runner.zig
index 30fc12a..baeedfe 100644
--- a/src/runner.zig
+++ b/src/runner.zig
@@ -154,9 +154,10 @@ pub const Runner = struct {
         var image = try self.getImage();
 
         var params = plugin.ParamList.init(self.allocator);
-        try params.append(plugin.Param{ .sym = "gain", .value = gain });
         defer params.deinit();
 
+        try params.append(plugin.Param{ .sym = "gain", .value = gain });
+
         // TODO if we could detect that the next command is a quicksave then
         // we don't need the temporary file in runPlugin and instead we
         // dump it all on the output image for it.
@@ -167,6 +168,27 @@ pub const Runner = struct {
         );
     }
 
+    fn rFlangerCmd(
+        self: *Runner,
+        split: usize,
+        index: usize,
+        delay_depth_avg: f32,
+        law_freq: f32,
+    ) !void {
+        var image = try self.getImage();
+        var params = plugin.ParamList.init(self.allocator);
+        defer params.deinit();
+
+        try params.append(plugin.Param{ .sym = "delay_depth_avg", .value = delay_depth_avg });
+        try params.append(plugin.Param{ .sym = "law_freq", .value = law_freq });
+
+        try image.runPlugin(
+            "http://plugin.org.uk/swh-plugins/retroFlange",
+            plugin.Position{ .split = split, .index = index },
+            params,
+        );
+    }
+
     fn runCommand(self: *Runner, cmd: *lang.Command) !void {
         return switch (cmd.command) {
             .Noop => {},
@@ -184,6 +206,15 @@ pub const Runner = struct {
                 try self.ampCmd(split, index, gain);
             },
 
+            .RFlanger => blk: {
+                const split = try cmd.usizeArgAt(0);
+                const index = try cmd.usizeArgAt(1);
+                const delay_depth_avg = try cmd.floatArgAt(2);
+                const law_freq = try cmd.floatArgAt(3);
+
+                try self.rFlangerCmd(split, index, delay_depth_avg, law_freq);
+            },
+
             else => blk: {
                 std.debug.warn("Unknown command: {}\n", cmd.command);
                 break :blk RunError.UnknownCommand;