surma
1f49d0f7bb
Imported from the spike branch, with: - a library crate (Host API) for the CLI and the tests - JSON test scenarios for candidates - commit on close only for new or truncated files - a Nix flake: nix run -- init, nix run -- run
38 lines
1.4 KiB
Rust
38 lines
1.4 KiB
Rust
//! Keeps a list of notes in /data/notes.json and publishes them as
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//! /public/notes.txt.
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use serde_json::{Value, json};
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use std::io::{BufRead, Write};
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const DATA: &str = "/data/notes.json";
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fn save(notes: &[String]) {
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std::fs::write(DATA, serde_json::to_string(notes).unwrap()).unwrap();
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std::fs::write("/public/notes.txt", notes.join("\n") + "\n").unwrap();
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}
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fn main() {
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let mut notes: Vec<String> = std::fs::read_to_string(DATA)
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.ok()
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.and_then(|s| serde_json::from_str(&s).ok())
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.unwrap_or_default();
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let mut out = std::io::stdout().lock();
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for line in std::io::stdin().lock().lines() {
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let Ok(line) = line else { break };
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let Ok(msg) = serde_json::from_str::<Value>(&line) else { continue };
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let body = &msg["body"];
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let reply = match body["type"].as_str() {
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Some("shutdown") => break,
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Some("add") => {
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notes.push(body["text"].as_str().unwrap_or_default().to_string());
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save(¬es);
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json!({"type": "added", "count": notes.len()})
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}
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Some("list") => json!({"type": "notes", "items": notes}),
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Some("crash") => panic!("asked to crash"),
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_ => json!({"type": "error", "reason": "unknown message"}),
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};
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writeln!(out, "{}", json!({"to": msg["from"], "reply_to": msg["id"], "body": reply})).unwrap();
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out.flush().unwrap();
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}
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}
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