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mod data;
mod indicators;
mod signals;
use serde_json::json;
use std::path::PathBuf;
use std::process::ExitCode;
const TEMPLATE: &str = include_str!("../web/template.html");
const USAGE: &str = "usage: stock <input.csv> [-o out.html] [--rsi 14] [--kd 9] [--swing 5]";
// --swing: minimum reversal in percent for a price swing (ZigZag) used by divergence detection
struct Args {
input: PathBuf,
output: Option<PathBuf>,
rsi: usize,
kd: usize,
swing: f64,
}
fn parse_args() -> Result<Args, String> {
let mut it = std::env::args().skip(1);
let (mut input, mut output, mut rsi, mut kd, mut swing) = (None, None, 14, 9, 5.0);
while let Some(a) = it.next() {
let mut val = |name: &str| it.next().ok_or(format!("{name} needs a value"));
match a.as_str() {
"-o" => output = Some(PathBuf::from(val("-o")?)),
"--rsi" => rsi = val("--rsi")?.parse().map_err(|e| format!("--rsi: {e}"))?,
"--kd" => kd = val("--kd")?.parse().map_err(|e| format!("--kd: {e}"))?,
"--swing" => swing = val("--swing")?.parse().map_err(|e| format!("--swing: {e}"))?,
"-h" | "--help" => return Err(String::new()),
_ if a.starts_with('-') => return Err(format!("unknown option {a}")),
_ => input = Some(PathBuf::from(a)),
}
}
if rsi == 0 || kd == 0 || !(swing > 0.0 && swing < 100.0) {
return Err("periods must be positive and --swing within (0, 100)".into());
}
Ok(Args { input: input.ok_or("missing input.csv")?, output, rsi, kd, swing })
}
fn run() -> Result<PathBuf, String> {
let args = parse_args()?;
let candles = data::load_csv(&args.input)?;
let rsi = indicators::rsi(&candles, args.rsi);
let (k, d) = indicators::kd(&candles, args.kd);
let swings = signals::zigzag(&candles, args.swing);
let mut divs = signals::divergences(&swings, &rsi, "RSI");
divs.extend(signals::divergences(&swings, &k, "K"));
divs.sort_by_key(|d| d.confirmed);
print!("{}", signals::forward_stats(&candles, &divs, &[5, 10, 20]));
let payload = json!({
"name": args.input.file_stem().map(|s| s.to_string_lossy().into_owned()).unwrap_or_default(),
"rsiPeriod": args.rsi,
"kdPeriod": args.kd,
"candles": candles,
"rsi": rsi,
"k": k,
"d": d,
"crosses": signals::crosses(&k, &d),
"divergences": divs,
});
// "</" would end the <script> element early.
let json = payload.to_string().replace("</", "<\\/");
let html = TEMPLATE.replace("/*__DATA__*/null", &json);
let out = args.output.unwrap_or_else(|| args.input.with_extension("html"));
std::fs::write(&out, html).map_err(|e| format!("{}: {e}", out.display()))?;
Ok(out)
}
fn main() -> ExitCode {
match run() {
Ok(out) => {
println!("wrote {}", out.display());
ExitCode::SUCCESS
}
Err(e) => {
if !e.is_empty() {
eprintln!("error: {e}");
}
eprintln!("{USAGE}");
ExitCode::FAILURE
}
}
}
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