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use std::collections::HashMap;
use std::ops::{Deref, DerefMut};
use std::path::PathBuf;
use std::time::SystemTime;
use crate::Handlebars;
use crate::handlebars::TemplateFileError;
#[derive(Debug)]
pub struct ReloadableHandlebars {
handlebars: Handlebars,
files: HashMap<String, (PathBuf, Option<SystemTime>)>,
}
impl ReloadableHandlebars {
#[inline]
pub fn new() -> ReloadableHandlebars {
ReloadableHandlebars {
handlebars: Handlebars::new(),
files: HashMap::new(),
}
}
#[inline]
pub fn register_template_file<S: Into<String>, P: Into<PathBuf>>(&mut self, name: S, file_path: P) -> Result<(), TemplateFileError> {
let name = name.into();
let file_path = file_path.into();
self.handlebars.register_template_file(name.as_str(), &file_path)?;
let metadata = file_path.metadata().unwrap();
let mtime = metadata.modified().ok();
self.files.insert(name, (file_path, mtime));
Ok(())
}
#[inline]
pub fn unregister_template_file<S: AsRef<str>>(&mut self, name: S) -> Option<PathBuf> {
let name = name.as_ref();
match self.files.remove(name) {
Some((file_path, _)) => {
self.handlebars.unregister_template(name);
Some(file_path)
}
None => {
None
}
}
}
#[inline]
pub fn reload_if_needed(&mut self) -> Result<(), TemplateFileError> {
for (name, (file_path, mtime)) in &mut self.files {
let metadata = file_path.metadata().map_err(|err| TemplateFileError::IOError(err, name.to_string()))?;
let (reload, new_mtime) = match mtime {
Some(mtime) => {
match metadata.modified() {
Ok(new_mtime) => {
(new_mtime > *mtime, Some(new_mtime))
}
Err(_) => {
(true, None)
}
}
}
None => {
match metadata.modified() {
Ok(new_mtime) => {
(true, Some(new_mtime))
}
Err(_) => {
(true, None)
}
}
}
};
if reload {
self.handlebars.register_template_file(name.as_str(), &file_path)?;
*mtime = new_mtime;
}
}
Ok(())
}
}
impl Deref for ReloadableHandlebars {
type Target = Handlebars;
#[inline]
fn deref(&self) -> &Self::Target {
&self.handlebars
}
}
impl DerefMut for ReloadableHandlebars {
#[inline]
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.handlebars
}
}