c6ac1827f6
* egui_web: use tracing crate * egui_glow: use tracing crate * Log at the debug level * egui_demo_app: enable tracing to log to stdout * Use tracing in egui-winit * Add opt-in tracing support to egui
117 lines
3.6 KiB
Rust
117 lines
3.6 KiB
Rust
use std::{
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collections::HashMap,
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path::{Path, PathBuf},
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};
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// ----------------------------------------------------------------------------
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/// A key-value store backed by a [RON](https://github.com/ron-rs/ron) file on disk.
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/// Used to restore egui state, glium window position/size and app state.
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pub struct FileStorage {
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ron_filepath: PathBuf,
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kv: HashMap<String, String>,
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dirty: bool,
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}
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impl FileStorage {
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/// Store the state in this .ron file.
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pub fn from_ron_filepath(ron_filepath: impl Into<PathBuf>) -> Self {
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let ron_filepath: PathBuf = ron_filepath.into();
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Self {
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kv: read_ron(&ron_filepath).unwrap_or_default(),
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ron_filepath,
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dirty: false,
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}
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}
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/// Find a good place to put the files that the OS likes.
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pub fn from_app_name(app_name: &str) -> Option<Self> {
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if let Some(proj_dirs) = directories_next::ProjectDirs::from("", "", app_name) {
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let data_dir = proj_dirs.data_dir().to_path_buf();
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if let Err(err) = std::fs::create_dir_all(&data_dir) {
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tracing::warn!(
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"Saving disabled: Failed to create app path at {:?}: {}",
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data_dir,
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err
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);
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None
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} else {
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Some(Self::from_ron_filepath(data_dir.join("app.ron")))
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}
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} else {
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tracing::warn!("Saving disabled: Failed to find path to data_dir.");
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None
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}
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}
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}
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impl crate::Storage for FileStorage {
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fn get_string(&self, key: &str) -> Option<String> {
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self.kv.get(key).cloned()
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}
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fn set_string(&mut self, key: &str, value: String) {
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if self.kv.get(key) != Some(&value) {
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self.kv.insert(key.to_owned(), value);
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self.dirty = true;
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}
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}
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fn flush(&mut self) {
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if self.dirty {
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// eprintln!("Persisted to {}", self.path.display());
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let file = std::fs::File::create(&self.ron_filepath).unwrap();
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let config = Default::default();
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ron::ser::to_writer_pretty(file, &self.kv, config).unwrap();
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self.dirty = false;
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}
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}
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}
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// ----------------------------------------------------------------------------
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fn read_ron<T>(ron_path: impl AsRef<Path>) -> Option<T>
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where
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T: serde::de::DeserializeOwned,
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{
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match std::fs::File::open(ron_path) {
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Ok(file) => {
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let reader = std::io::BufReader::new(file);
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match ron::de::from_reader(reader) {
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Ok(value) => Some(value),
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Err(err) => {
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tracing::warn!("Failed to parse RON: {}", err);
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None
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}
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}
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}
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Err(_err) => {
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// File probably doesn't exist. That's fine.
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None
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}
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}
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}
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// ----------------------------------------------------------------------------
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/// Alternative to `FileStorage`
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pub fn read_memory(ctx: &egui::Context, memory_file_path: impl AsRef<std::path::Path>) {
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let memory: Option<egui::Memory> = read_ron(memory_file_path);
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if let Some(memory) = memory {
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*ctx.memory() = memory;
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}
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}
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/// Alternative to `FileStorage`
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///
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/// # Errors
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/// When failing to serialize or create the file.
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pub fn write_memory(
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ctx: &egui::Context,
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memory_file_path: impl AsRef<std::path::Path>,
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) -> Result<(), Box<dyn std::error::Error>> {
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let file = std::fs::File::create(memory_file_path)?;
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let ron_config = Default::default();
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ron::ser::to_writer_pretty(file, &*ctx.memory(), ron_config)?;
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Ok(())
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}
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