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main.rs
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main.rs
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// Copyright © SixtyFPS GmbH <[email protected]>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
#![doc = include_str!("README.md")]
use i_slint_core::model::{Model, ModelRc};
use i_slint_core::SharedVector;
use slint_interpreter::{ComponentHandle, ComponentInstance, SharedString, Value};
use std::future::Future;
use std::pin::Pin;
use std::sync::atomic::{AtomicU32, Ordering};
use std::sync::{Arc, Mutex};
use std::task::Wake;
use clap::Parser;
type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
#[derive(Clone, clap::Parser)]
#[command(author, version, about, long_about = None)]
struct Cli {
#[arg(short = 'I', name = "include path for other .slint files", number_of_values = 1, action)]
include_paths: Vec<std::path::PathBuf>,
/// The .slint file to load ('-' for stdin)
#[arg(name = "path to .slint file", action)]
path: std::path::PathBuf,
/// The style name ('native' or 'fluent')
#[arg(long, name = "style name", action)]
style: Option<String>,
/// The rendering backend
#[arg(long, name = "backend", action)]
backend: Option<String>,
/// Automatically watch the file system, and reload when it changes
#[arg(long, action)]
auto_reload: bool,
/// Load properties from a json file ('-' for stdin)
#[arg(long, name = "load data file", action)]
load_data: Option<std::path::PathBuf>,
/// Store properties values in a json file at exit ('-' for stdout)
#[arg(long, name = "save data file", action)]
save_data: Option<std::path::PathBuf>,
/// Specify callbacks handler.
/// The first argument is the callback name, and the second argument is a string that is going
/// to be passed to the shell to be executed. Occurrences of `$1` will be replaced by the first argument,
/// and so on.
#[arg(long, value_names(&["callback", "handler"]), number_of_values = 2, action)]
on: Vec<String>,
/// Translation domain
#[arg(long = "translation-domain", action)]
translation_domain: Option<String>,
#[arg(long = "translation-dir", action)]
translation_dir: Option<std::path::PathBuf>,
}
thread_local! {static CURRENT_INSTANCE: std::cell::RefCell<Option<ComponentInstance>> = Default::default();}
static EXIT_CODE: std::sync::atomic::AtomicI32 = std::sync::atomic::AtomicI32::new(0);
fn main() -> Result<()> {
env_logger::init();
let args = Cli::parse();
if args.auto_reload && args.save_data.is_some() {
eprintln!("Cannot pass both --auto-reload and --save-data");
std::process::exit(-1);
}
if let Some(backend) = &args.backend {
std::env::set_var("SLINT_BACKEND", backend);
}
if let Some(dirname) = args.translation_dir.clone() {
i_slint_core::translations::gettext_bindtextdomain(
args.translation_domain.as_ref().map(String::as_str).unwrap_or_default(),
dirname,
)?;
};
let fswatcher = if args.auto_reload { Some(start_fswatch_thread(args.clone())?) } else { None };
let mut compiler = init_compiler(&args, fswatcher);
let c = spin_on::spin_on(compiler.build_from_path(args.path));
slint_interpreter::print_diagnostics(compiler.diagnostics());
let c = match c {
Some(c) => c,
None => std::process::exit(-1),
};
let component = c.create().unwrap();
init_dialog(&component);
if let Some(data_path) = args.load_data {
load_data(&component, &data_path)?;
}
install_callbacks(&component, &args.on);
if args.auto_reload {
CURRENT_INSTANCE.with(|current| current.replace(Some(component.clone_strong())));
}
component.run().unwrap();
if let Some(data_path) = args.save_data {
let mut obj = serde_json::Map::new();
for (name, _) in c.properties() {
fn to_json(val: slint_interpreter::Value) -> Option<serde_json::Value> {
match val {
slint_interpreter::Value::Number(x) => Some(x.into()),
slint_interpreter::Value::String(x) => Some(x.as_str().into()),
slint_interpreter::Value::Bool(x) => Some(x.into()),
slint_interpreter::Value::Model(model) => {
let mut res = Vec::with_capacity(model.row_count());
for i in 0..model.row_count() {
res.push(to_json(model.row_data(i).unwrap())?);
}
Some(serde_json::Value::Array(res))
}
slint_interpreter::Value::Struct(st) => {
let mut obj = serde_json::Map::new();
for (k, v) in st.iter() {
obj.insert(k.into(), to_json(v.clone())?);
}
Some(obj.into())
}
_ => None,
}
}
if let Some(v) = to_json(component.get_property(&name).unwrap()) {
obj.insert(name, v);
}
}
if data_path == std::path::Path::new("-") {
serde_json::to_writer_pretty(std::io::stdout(), &obj)?;
} else {
serde_json::to_writer_pretty(std::fs::File::create(data_path)?, &obj)?;
}
}
std::process::exit(EXIT_CODE.load(std::sync::atomic::Ordering::Relaxed))
}
fn init_compiler(
args: &Cli,
fswatcher: Option<Arc<Mutex<notify::RecommendedWatcher>>>,
) -> slint_interpreter::ComponentCompiler {
let mut compiler = slint_interpreter::ComponentCompiler::default();
if let Some(domain) = args.translation_domain.clone() {
compiler.set_translation_domain(domain);
}
compiler.set_include_paths(args.include_paths.clone());
if let Some(style) = &args.style {
compiler.set_style(style.clone());
}
if let Some(watcher) = fswatcher {
notify::Watcher::watch(
&mut *watcher.lock().unwrap(),
&args.path,
notify::RecursiveMode::NonRecursive,
)
.unwrap_or_else(|err| {
eprintln!("Warning: error while watching {}: {:?}", args.path.display(), err)
});
if let Some(data_path) = &args.load_data {
notify::Watcher::watch(
&mut *watcher.lock().unwrap(),
data_path,
notify::RecursiveMode::NonRecursive,
)
.unwrap_or_else(|err| {
eprintln!("Warning: error while watching {}: {:?}", data_path.display(), err)
});
}
compiler.set_file_loader(move |path| {
notify::Watcher::watch(
&mut *watcher.lock().unwrap(),
path,
notify::RecursiveMode::NonRecursive,
)
.unwrap_or_else(|err| {
eprintln!("Warning: error while watching {}: {:?}", path.display(), err)
});
Box::pin(async { None })
})
}
compiler
}
fn init_dialog(instance: &ComponentInstance) {
for cb in instance.definition().callbacks() {
let exit_code = match cb.as_str() {
"ok-clicked" | "yes-clicked" | "close-clicked" => 0,
"cancel-clicked" | "no-clicked" => 1,
_ => continue,
};
// this is a dialog, so clicking the "x" should cancel
EXIT_CODE.store(1, std::sync::atomic::Ordering::Relaxed);
instance
.set_callback(&cb, move |_| {
EXIT_CODE.store(exit_code, std::sync::atomic::Ordering::Relaxed);
i_slint_core::api::quit_event_loop().unwrap();
Default::default()
})
.unwrap();
}
}
static PENDING_EVENTS: AtomicU32 = AtomicU32::new(0);
fn start_fswatch_thread(args: Cli) -> Result<Arc<Mutex<notify::RecommendedWatcher>>> {
let (tx, rx) = std::sync::mpsc::channel();
let w = Arc::new(Mutex::new(notify::recommended_watcher(tx)?));
let w2 = w.clone();
std::thread::spawn(move || {
while let Ok(event) = rx.recv() {
use notify::EventKind::*;
if let Ok(event) = event {
if (matches!(event.kind, Modify(_) | Remove(_) | Create(_)))
&& PENDING_EVENTS.load(Ordering::SeqCst) == 0
{
PENDING_EVENTS.fetch_add(1, Ordering::SeqCst);
run_in_ui_thread(Box::pin(reload(args.clone(), w2.clone())));
}
}
}
});
Ok(w)
}
async fn reload(args: Cli, fswatcher: Arc<Mutex<notify::RecommendedWatcher>>) {
let mut compiler = init_compiler(&args, Some(fswatcher));
let c = compiler.build_from_path(&args.path).await;
slint_interpreter::print_diagnostics(compiler.diagnostics());
if let Some(c) = c {
CURRENT_INSTANCE.with(|current| {
let mut current = current.borrow_mut();
if let Some(handle) = current.take() {
let window = handle.window();
let new_handle = c.create_with_existing_window(window);
init_dialog(&new_handle);
current.replace(new_handle);
} else {
let handle = c.create().unwrap();
init_dialog(&handle);
handle.show().unwrap();
current.replace(handle);
}
if let Some(data_path) = args.load_data {
let _ = load_data(current.as_ref().unwrap(), &data_path);
}
eprintln!("Successful reload of {}", args.path.display());
});
}
PENDING_EVENTS.fetch_sub(1, Ordering::SeqCst);
}
fn load_data(instance: &ComponentInstance, data_path: &std::path::Path) -> Result<()> {
let json: serde_json::Value = if data_path == std::path::Path::new("-") {
serde_json::from_reader(std::io::stdin())?
} else {
serde_json::from_reader(std::fs::File::open(data_path)?)?
};
let obj = json.as_object().ok_or("The data is not a JSON object")?;
for (name, v) in obj {
fn from_json(v: &serde_json::Value) -> slint_interpreter::Value {
match v {
serde_json::Value::Null => slint_interpreter::Value::Void,
serde_json::Value::Bool(b) => (*b).into(),
serde_json::Value::Number(n) => {
slint_interpreter::Value::Number(n.as_f64().unwrap_or(f64::NAN))
}
serde_json::Value::String(s) => SharedString::from(s.as_str()).into(),
serde_json::Value::Array(array) => slint_interpreter::Value::Model(ModelRc::new(
i_slint_core::model::SharedVectorModel::from(
array.iter().map(from_json).collect::<SharedVector<Value>>(),
),
)),
serde_json::Value::Object(obj) => obj
.iter()
.map(|(k, v)| (k.clone(), from_json(v)))
.collect::<slint_interpreter::Struct>()
.into(),
}
}
match instance.set_property(name, from_json(v)) {
Ok(()) => (),
Err(e) => eprintln!("Warning: cannot set property '{}' from data file: {:?}", name, e),
};
}
Ok(())
}
fn install_callbacks(instance: &ComponentInstance, callbacks: &[String]) {
assert!(callbacks.len() % 2 == 0);
for chunk in callbacks.chunks(2) {
if let [callback, cmd] = chunk {
let cmd = cmd.clone();
match instance.set_callback(callback, move |args| {
match execute_cmd(&cmd, args) {
Ok(()) => (),
Err(e) => eprintln!("Error: {}", e),
}
Value::Void
}) {
Ok(()) => (),
Err(e) => {
eprintln!("Warning: cannot set callback handler for '{}': {}", callback, e)
}
}
}
}
}
fn execute_cmd(cmd: &str, callback_args: &[Value]) -> Result<()> {
let cmd_args = shlex::split(cmd).ok_or("Could not parse the command string")?;
let program_name = cmd_args.first().ok_or("Missing program name")?;
let mut command = std::process::Command::new(program_name);
let callback_args = callback_args
.iter()
.map(|v| {
Ok(match v {
Value::Number(x) => x.to_string(),
Value::String(x) => x.to_string(),
Value::Bool(x) => x.to_string(),
Value::Image(img) => {
img.path().map(|p| p.to_string_lossy()).unwrap_or_default().into()
}
_ => return Err(format!("Cannot convert argument to string: {:?}", v).into()),
})
})
.collect::<Result<Vec<String>>>()?;
for mut a in cmd_args.into_iter().skip(1) {
for (idx, cb_a) in callback_args.iter().enumerate() {
a = a.replace(&format!("${}", idx + 1), cb_a);
}
command.arg(a);
}
command.spawn()?;
Ok(())
}
/// This type is duplicated with lsp/preview.rs
struct FutureRunner {
fut: Mutex<Option<Pin<Box<dyn Future<Output = ()>>>>>,
}
/// Safety: the future is only going to be run in the UI thread
unsafe impl Send for FutureRunner {}
/// Safety: the future is only going to be run in the UI thread
unsafe impl Sync for FutureRunner {}
impl Wake for FutureRunner {
fn wake(self: Arc<Self>) {
i_slint_core::api::invoke_from_event_loop(move || {
let waker = self.clone().into();
let mut cx = std::task::Context::from_waker(&waker);
let mut fut_opt = self.fut.lock().unwrap();
if let Some(fut) = &mut *fut_opt {
match fut.as_mut().poll(&mut cx) {
std::task::Poll::Ready(_) => *fut_opt = None,
std::task::Poll::Pending => {}
}
}
})
.unwrap();
}
}
fn run_in_ui_thread(fut: Pin<Box<dyn Future<Output = ()>>>) {
Arc::new(FutureRunner { fut: Mutex::new(Some(fut)) }).wake()
}