Ely Office: six offline-first desktop apps in Rust and GPUI

ElyDoc, ElyTable, ElyShow (LibreOfficeKit), ElyPDF (MuPDF), ElyTree (Git),
ElyMark (Milkdown and CodeMirror in CEF). ElyMail and ElyAgent follow.

crates/ely-platform/src/startup.rs

@@ -0,0 +1,80 @@
+use std::{
+    panic, process,
+    sync::atomic::{AtomicBool, Ordering},
+};
+
+use crate::{AppId, logging};
+
+static STARTED: AtomicBool = AtomicBool::new(false);
+
+/// The text a failed start shows, in both languages.
+pub fn message(app: AppId, reason: &str, log: &str) -> String {
+    let name = app.name();
+    format!("{name} 无法启动。\n{name} could not start.\n\n{reason}\n\n日志 / Log: {log}")
+}
+
+/// Logs and shows why `app` cannot start, then exits 1.
+pub fn fail(app: AppId, reason: &str) -> ! {
+    log::error!("{} cannot start: {reason}", app.name());
+    let log = logging::path().map_or_else(
+        || "none, logging did not start".to_string(),
+        |path| path.display().to_string(),
+    );
+    let text = message(app, reason, &log);
+    eprintln!("{text}");
+    if std::env::var_os("ELY_NO_DIALOG").is_none() {
+        rfd::MessageDialog::new()
+            .set_level(rfd::MessageLevel::Error)
+            .set_title(app.name())
+            .set_description(&text)
+            .show();
+    }
+    process::exit(1)
+}
+
+/// Until `started`, a panic is a failed start.
+pub fn guard(app: AppId) {
+    let previous = panic::take_hook();
+    panic::set_hook(Box::new(move |info| {
+        if STARTED.load(Ordering::Relaxed) {
+            previous(info);
+        } else {
+            fail(
+                app,
+                &format!("the app panicked before its first frame: {info}"),
+            );
+        }
+    }));
+}
+
+/// Ely restores sessions itself; AppKit's "reopen windows?" would block.
+#[cfg(target_os = "macos")]
+pub fn no_window_restore() {
+    use objc2_foundation::{NSString, NSUserDefaults};
+    let key = NSString::from_str("ApplePersistenceIgnoreState");
+    NSUserDefaults::standardUserDefaults().setBool_forKey(true, &key);
+}
+
+#[cfg(not(target_os = "macos"))]
+pub fn no_window_restore() {}
+
+/// Marks the start as done; later panics are ordinary panics.
+pub fn started() {
+    STARTED.store(true, Ordering::Relaxed);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::message;
+    use crate::AppId;
+
+    #[test]
+    fn the_message_names_the_app_the_reason_and_the_log_in_both_languages() {
+        let text = message(AppId::Pdf, "no usable GPU", "/logs/ely.log");
+
+        assert!(text.contains("ElyPDF 无法启动"), "{text}");
+        assert!(text.contains("ElyPDF could not start"), "{text}");
+        assert!(text.contains("no usable GPU"), "{text}");
+        assert!(text.contains("/logs/ely.log"), "{text}");
+    }
+}