Add filesystem/git/podman/systemd adapters, git/shell hooks, bread-emit CLI, app-detection helpers

bread-emit/src/main.rs

@@ -0,0 +1,75 @@
+//! Minimal fire-and-forget emitter for breadd's IPC socket.
+//!
+//! This exists because shell precmd/preexec hooks (and git hooks) fire on
+//! every command / commit — spawning the full `bread` CLI (clap parsing +
+//! a Tokio runtime + a round trip) on that path is perceptible latency in
+//! an interactive shell. This binary skips all of that: no async runtime,
+//! argv is parsed by hand, and it never waits for or reads a reply. A
+//! down or slow daemon must never delay or hang the caller's shell.
+
+use serde_json::{json, Value};
+use std::io::Write;
+use std::os::unix::net::UnixStream;
+use std::time::Duration;
+
+fn parse_args(args: &[String]) -> Option<(String, Option<String>, Option<String>, String)> {
+    let mut event = None;
+    let mut source = None;
+    let mut kind = None;
+    let mut data = "{}".to_string();
+
+    let mut i = 0;
+    while i < args.len() {
+        match args[i].as_str() {
+            "--source" => {
+                source = args.get(i + 1).cloned();
+                i += 2;
+            }
+            "--kind" => {
+                kind = args.get(i + 1).cloned();
+                i += 2;
+            }
+            "--data" => {
+                data = args.get(i + 1).cloned().unwrap_or_else(|| "{}".to_string());
+                i += 2;
+            }
+            other => {
+                if event.is_none() {
+                    event = Some(other.to_string());
+                }
+                i += 1;
+            }
+        }
+    }
+
+    event.map(|event| (event, source, kind, data))
+}
+
+fn main() {
+    let args: Vec<String> = std::env::args().skip(1).collect();
+    let Some((event, source, kind, data)) = parse_args(&args) else {
+        eprintln!("usage: bread-emit <event> [--source <source> --kind <kind>] [--data <json>]");
+        std::process::exit(1);
+    };
+
+    let parsed_data: Value = serde_json::from_str(&data).unwrap_or_else(|_| json!({}));
+    let mut params = json!({ "event": event, "data": parsed_data });
+    if let Some(source) = source {
+        params["source"] = json!(source);
+    }
+    if let Some(kind) = kind {
+        params["kind"] = json!(kind);
+    }
+
+    let request = json!({ "id": "0", "method": "emit", "params": params });
+    let Ok(line) = serde_json::to_string(&request) else {
+        return;
+    };
+
+    // Best-effort: connect, write, exit. Never read a reply, never retry,
+    // never block longer than the write timeout below.
+    if let Ok(mut stream) = UnixStream::connect(bread_shared::resolve_socket_path()) {
+        let _ = stream.set_write_timeout(Some(Duration::from_millis(200)));
+        let _ = writeln!(stream, "{line}");
+    }
+}