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use std::collections::HashMap;
use std::ops::{Deref, DerefMut};
use std::path::PathBuf;
use std::time::SystemTime;
use crate::tera::Error as TeraError;
use crate::Tera;
#[derive(Debug)]
pub struct ReloadableTera {
tera: Tera,
files: HashMap<&'static str, (PathBuf, Option<SystemTime>)>,
}
impl ReloadableTera {
#[inline]
pub fn new() -> ReloadableTera {
ReloadableTera {
tera: Tera::default(),
files: HashMap::new(),
}
}
#[inline]
pub fn register_template_file<P: Into<PathBuf>>(
&mut self,
name: &'static str,
file_path: P,
) -> Result<(), TeraError> {
let file_path = file_path.into();
let metadata = file_path.metadata().map_err(|err| TeraError::msg(err.to_string()))?;
let mtime = metadata.modified().ok();
self.tera.add_template_file(&file_path, Some(name))?;
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, _)) => {
Some(file_path)
}
None => None,
}
}
#[inline]
pub fn reload_if_needed(&mut self) -> Result<(), TeraError> {
for (name, (file_path, mtime)) in &mut self.files {
let metadata = file_path.metadata().map_err(|err| TeraError::msg(err.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.tera.add_template_file(&file_path, Some(name))?;
*mtime = new_mtime;
}
}
Ok(())
}
}
impl Default for ReloadableTera {
#[inline]
fn default() -> Self {
ReloadableTera::new()
}
}
impl Deref for ReloadableTera {
type Target = Tera;
#[inline]
fn deref(&self) -> &Self::Target {
&self.tera
}
}
impl DerefMut for ReloadableTera {
#[inline]
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.tera
}
}