feat(fpcalc): Add command line interface using clap

fpcalc/Cargo.toml

@@ -6,3 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+clap = { version = "4.5.19", features = ["derive"] }
+rusty-chromaprint = {path = "../chromaprint"}

fpcalc/src/main.rs

@@ -1,3 +1,98 @@
+use clap::Parser;
+use std::path::PathBuf;
+use std::fmt;
+use rusty_chromaprint::Configuration;
+
+#[derive(Default, Debug, Clone)]
+struct Algorithm(Configuration);
+
+impl TryFrom<&str> for Algorithm {
+    type Error = &'static str;
+
+    fn try_from(value: &str) -> Result<Algorithm, Self::Error> {
+        let algorithm_id = value.parse::<u8>().map_err(|_| "value must be between an integer between 0 and 4")?;
+        let configuration = match algorithm_id {
+            0 => Configuration::preset_test1(),
+            1 => Configuration::preset_test2(),
+            2 => Configuration::preset_test3(),
+            3 => Configuration::preset_test4(),
+            4 => Configuration::preset_test5(),
+            _ => { return Err("unknown algorithm ID"); },
+        };
+        debug_assert_eq!(configuration.id(), algorithm_id);
+        let algorithm = Algorithm(configuration);
+        Ok(algorithm)
+    }
+}
+
+impl fmt::Display for Algorithm {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.id().fmt(f)
+    }
+}
+
+/// Generate fingerprints from audio files/streams.
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+struct Args {
+    /// Set the input format name
+    #[arg(short, long)]
+    format: Option<String>,
+
+    /// Set the sample rate of the input audio
+    #[arg(short, long)]
+    rate: Option<usize>,
+
+    /// Set the number of channels in the input audio
+    #[arg(short, long)]
+    channels: Option<usize>,
+
+    /// Restrict the duration of the processed input audio
+    #[arg(short, long, default_value_t = 120)]
+    length: usize,
+
+    /// Split the input audio into chunks of this duration
+    #[arg(short = 'C', long)]
+    chunk: Option<usize>,
+
+    /// Set the algorithm method.
+    #[arg(short, long, value_parser = |s: &str| Algorithm::try_from(s), default_value_t)]
+    algorithm: Algorithm,
+
+    /// Overlap the chunks slightly to make sure audio on the edges is fingerprinted
+    #[arg(short, long)]
+    overlap: bool,
+
+    /// Output UNIX timestamps for chunked results, useful when fingerprinting real-time audio stream
+    #[arg(short = 'T', long)]
+    ts: bool,
+
+    /// Output fingerprints in the uncompressed format
+    #[arg(short = 'R', long)]
+    raw: bool,
+
+    /// Change the uncompressed format from unsigned integers to signed (for pg_acoustid compatibility)
+    #[arg(short, long)]
+    signed: bool,
+
+    /// Print the output in JSON format
+    #[arg(short, long)]
+    json: bool,
+
+    /// Print the output in text format
+    #[arg(short, long)]
+    text: bool,
+
+    /// Print the just the fingerprint in text format
+    #[arg(short, long)]
+    plain: bool,
+
+    /// File to analyze
+    file: PathBuf,
+}
+
 fn main() {
-    println!("Hello, world!");
+    let _args = Args::parse();
+
+    todo!();
 }