adapt cli to new yml system

src/cli.rs

@@ -1,5 +1,6 @@
-use std::path::PathBuf;
+use std::{fmt::Display, fs::read_to_string, io, str::FromStr};
 
+use amplify::{From, Wrapper};
 use clap::Parser;
 
 /// Cli entry point
@@ -8,9 +9,9 @@ use clap::Parser;
 pub enum BngCli {
     /// Play the song through default sink
     Play(PlayOpts),
-    /// Export the song to a sound file
+    /// Export the song to a sound FileContents
     Export(ExportOpts),
-    /// List supported sound file extensions and instrument / song available expressions
+    /// List supported sound FileContents extensions and instrument / song available expressions
     #[command(subcommand)]
     List(ListOpts),
 }
@@ -19,24 +20,27 @@ pub enum BngCli {
 #[derive(Clone, Parser)]
 #[cfg_attr(debug_assertions, derive(Debug))]
 pub struct PlayOpts {
-    input: PathBuf,
+    #[arg(value_parser = FileContents::from_str)]
+    input: FileContents,
 }
 
 /// [`BngCli`] "export" command options
 #[derive(Clone, Parser)]
 #[cfg_attr(debug_assertions, derive(Debug))]
 pub struct ExportOpts {
-    /// Input file (written song file)
-    input: PathBuf,
-    /// Output file (sound file)
-    output: PathBuf,
+    /// Input FileContents (written song FileContents)
+    #[arg(value_parser = FileContents::from_str)]
+    input: FileContents,
+    /// Output FileContents (sound FileContents)
+    #[arg(value_parser = AudioFileName::from_str)]
+    output: AudioFileName,
 }
 
 /// [`BngCli`] "list" command sub-commands
 #[derive(Clone, Parser)]
 #[cfg_attr(debug_assertions, derive(Debug))]
 pub enum ListOpts {
-    /// List supported sound file extensions to export songs
+    /// List supported sound FileContents extensions to export songs
     #[command(subcommand)]
     Extensions,
     /// List available math expressions for instrument definition
@@ -46,3 +50,41 @@ pub enum ListOpts {
     #[command(subcommand)]
     Glyphs,
 }
+
+#[derive(Clone, Wrapper, From)]
+#[wrapper(Deref)]
+#[cfg_attr(debug_assertions, derive(Debug))]
+pub struct FileContents(String);
+
+impl FromStr for FileContents {
+    type Err = io::Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        read_to_string(s).map(Into::into)
+    }
+}
+
+#[derive(Clone, Wrapper, From)]
+#[wrapper(Deref)]
+#[cfg_attr(debug_assertions, derive(Debug))]
+pub struct AudioFileName(String);
+
+#[derive(Debug)]
+pub struct UnsupportedFileExtensionError;
+
+impl std::error::Error for UnsupportedFileExtensionError {}
+
+impl Display for UnsupportedFileExtensionError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "The extension of the selected output sound file is not supported."
+        )
+    }
+}
+
+impl FromStr for AudioFileName {
+    type Err = UnsupportedFileExtensionError;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(s.to_owned().into())
+    }
+}