simple playback feature

Cargo.toml

@@ -14,7 +14,7 @@ name = "bliplib"
 [dependencies]
 anyhow = { version = "1.0", optional = true }
 cfg-if = "1"
-clap = { version = "4.5.38", features = ["derive"], optional = true }
+clap = { version = "4.5.39", features = ["derive"], optional = true }
 derive-new = "0.7"
 derive_builder = "0.20"
 derive_wrapper = "0.1"
@@ -29,10 +29,12 @@ nom_locate = "5.0"
 raw_audio = { version = "0.0", optional = true }
 strum = { version = "0.27", features = ["derive"] }
 thiserror = "2.0"
+rodio = { version = "0.20", default-features = false, optional = true }
+dasp_sample = { version = "0", optional = true }
 
 [features]
 default = ["bin", "all-formats"]
-bin = ["anyhow", "clap"]
+bin = ["anyhow", "clap", "rodio", "dasp_sample"]
 all-formats = ["mp3", "wav", "flac", "raw"]
 mp3 = ["mp3lame-encoder"]
 wav = ["hound"]

src/cli/cli.rs

@@ -6,7 +6,7 @@ use std::{
     fs::File,
     io::{self, Cursor, Read, stdin},
     ops::Not,
-    str::{Bytes, FromStr},
+    str::FromStr,
 };
 
 use anyhow::anyhow;
@@ -47,7 +47,7 @@ pub(super) enum Cli {
 
 #[derive(Parser, Clone, Getters)]
 #[cfg_attr(debug_assertions, derive(Debug))]
-#[getset(get)]
+#[getset(get = "pub(super)")]
 pub(super) struct PlayOpts {
     /// Use this sheet music [default: stdin]
     #[command(flatten)]
@@ -72,7 +72,7 @@ pub(super) struct PlayOpts {
     /// Add a slope expression named NAME which mutates the VARIABLE with the result of EXPR each frame
     #[arg(short, long = "slope", value_name = "NAME:VARIABLE=EXPR", value_parser = parse_key_tuple::<LetterString, Letter, Expression>)]
     #[getset(skip)]
-    slopes: Vec<(String, (LetterString, Expression))>,
+    slopes: Vec<(LetterString, (char, Expression))>,
 }
 
 impl PlayOpts {
@@ -84,13 +84,15 @@ impl PlayOpts {
         self.macros.iter().map(|(c, s)| (c.as_ref(), s))
     }
 
-    pub(super) fn slopes(&self) -> impl Iterator<Item = (&String, (&String, &Expression))> {
-        self.slopes.iter().map(|(id, (s, e))| (id, (s.as_ref(), e)))
+    pub(super) fn slopes(&self) -> impl Iterator<Item = (&String, (&char, &Expression))> {
+        self.slopes
+            .iter()
+            .map(|(name, (v, e))| (name.as_ref(), (v, e)))
     }
 }
 
 impl InputGroup {
-    pub(super) fn get<'a>(&'a self) -> Box<dyn Read> {
+    pub(super) fn get(&self) -> Box<dyn Read> {
         self.input
             .as_ref()
             .map(|i| Box::new(i.clone().0) as Box<dyn Read>)

src/cli/main.rs

@@ -1,13 +1,55 @@
 mod cli;
-use clap::Parser;
-use cli::Cli;
+use std::io::read_to_string;
 
-fn main() {
+use anyhow::{Context as _, anyhow};
+use bliplib::{
+    compiler::{Compiler, Context, SAMPLE_RATE, VariableChange},
+    parser::Parser,
+};
+use clap::Parser as _;
+use cli::Cli;
+use dasp_sample::Sample;
+use rodio::{OutputStream, Sink, buffer::SamplesBuffer};
+
+fn main() -> anyhow::Result<()> {
     let cli = Cli::parse();
     use Cli::*;
     match cli {
-        Play(play_opts) => todo!(),
+        Play(opts) => {
+            let (_stream, stream_handle) = OutputStream::try_default()
+                .context("Failed to find (or use) default audio device")?;
+            let sink = Sink::try_new(&stream_handle).context("Epic audio playback failure")?;
+
+            let parser = Parser::new(
+                opts.notes(),
+                opts.slopes()
+                    .map(|(s, (v, e))| (s, VariableChange(*v, e.clone())))
+                    .collect::<Vec<_>>(),
+                opts.variables().map(|(v, _)| *v).collect::<Vec<_>>(),
+            );
+            let input = read_to_string(opts.input().get()).context("Failed to read input")?;
+            let tokens = parser
+                .parse_all(&input)
+                .map_err(|e| anyhow!("{e}"))
+                .context("Failed to parse input")?;
+
+            let compiler = Compiler::from(Context::new(
+                opts.variables().map(|(a, b)| (*a, *b)),
+                opts.instrument().clone(),
+                opts.slopes().map(|(_, (a, b))| (*a, b.clone())),
+            ));
+            let samples: Vec<f32> = compiler
+                .compile_all(tokens)
+                .context("Failed to process input tokens")?
+                .into_iter()
+                .map(Sample::to_sample)
+                .collect();
+
+            sink.append(SamplesBuffer::new(1, SAMPLE_RATE as u32, samples));
+            sink.sleep_until_end();
+        }
         Export(export_opts) => todo!(),
         Memo(memo) => todo!(),
     }
+    Ok(())
 }

src/compiler.rs

@@ -14,9 +14,9 @@ use thiserror::Error;
 
 cfg_if! {
     if #[cfg(test)] {
-        const SAMPLE_RATE: u16 = 10;
+        pub const SAMPLE_RATE: u16 = 10;
     } else {
-        const SAMPLE_RATE: u16 = 48000;
+        pub const SAMPLE_RATE: u16 = 48000;
     }
 }
 
@@ -24,6 +24,26 @@ cfg_if! {
 #[cfg_attr(test, derive(Debug))]
 pub struct TokenVec(pub(crate) Vec<Box<dyn Token>>);
 
+impl IntoIterator for TokenVec {
+    type Item = Box<dyn Token>;
+    type IntoIter = <Vec<Box<(dyn Token + 'static)>> as IntoIterator>::IntoIter;
+    fn into_iter(self) -> Self::IntoIter {
+        self.0.into_iter()
+    }
+}
+
+impl Token for Box<dyn Token> {
+    fn apply(&self, context: Context) -> Result<Context, CompilerError> {
+        self.as_ref().apply(context)
+    }
+}
+
+impl Type for Box<dyn Token> {
+    fn type_id(&self) -> TypeId {
+        self.as_ref().type_id()
+    }
+}
+
 pub trait Type {
     fn type_id(&self) -> TypeId;
 }
@@ -386,7 +406,7 @@ impl Context {
 
 #[derive(From)]
 #[cfg_attr(test, derive(Debug, PartialEq))]
-struct Compiler(Context);
+pub struct Compiler(Context);
 
 impl Compiler {
     pub fn step(self, token: impl Token) -> Result<Self, CompilerError> {