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use std::{
collections::HashMap,
path::{Path, PathBuf},
};
pub struct FileStorage {
ron_filepath: PathBuf,
kv: HashMap<String, String>,
dirty: bool,
}
impl FileStorage {
pub fn from_ron_filepath(ron_filepath: impl Into<PathBuf>) -> Self {
let ron_filepath: PathBuf = ron_filepath.into();
Self {
kv: read_ron(&ron_filepath).unwrap_or_default(),
ron_filepath,
dirty: false,
}
}
pub fn from_app_name(app_name: &str) -> Option<Self> {
if let Some(proj_dirs) = directories_next::ProjectDirs::from("", "", app_name) {
let data_dir = proj_dirs.data_dir().to_path_buf();
if let Err(err) = std::fs::create_dir_all(&data_dir) {
eprintln!(
"Saving disabled: Failed to create app path at {:?}: {}",
data_dir, err
);
None
} else {
Some(Self::from_ron_filepath(data_dir.join("app.ron")))
}
} else {
eprintln!("Saving disabled: Failed to find path to data_dir.");
None
}
}
}
impl crate::Storage for FileStorage {
fn get_string(&self, key: &str) -> Option<String> {
self.kv.get(key).cloned()
}
fn set_string(&mut self, key: &str, value: String) {
if self.kv.get(key) != Some(&value) {
self.kv.insert(key.to_owned(), value);
self.dirty = true;
}
}
fn flush(&mut self) {
if self.dirty {
let file = std::fs::File::create(&self.ron_filepath).unwrap();
let config = Default::default();
ron::ser::to_writer_pretty(file, &self.kv, config).unwrap();
self.dirty = false;
}
}
}
fn read_ron<T>(ron_path: impl AsRef<Path>) -> Option<T>
where
T: serde::de::DeserializeOwned,
{
match std::fs::File::open(ron_path) {
Ok(file) => {
let reader = std::io::BufReader::new(file);
match ron::de::from_reader(reader) {
Ok(value) => Some(value),
Err(err) => {
eprintln!("ERROR: Failed to parse RON: {}", err);
None
}
}
}
Err(_err) => {
None
}
}
}
pub fn read_memory(ctx: &egui::Context, memory_file_path: impl AsRef<std::path::Path>) {
let memory: Option<egui::Memory> = read_ron(memory_file_path);
if let Some(memory) = memory {
*ctx.memory() = memory;
}
}
pub fn write_memory(
ctx: &egui::Context,
memory_file_path: impl AsRef<std::path::Path>,
) -> Result<(), Box<dyn std::error::Error>> {
let file = std::fs::File::create(memory_file_path)?;
let ron_config = Default::default();
ron::ser::to_writer_pretty(file, &*ctx.memory(), ron_config)?;
Ok(())
}