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|
use std::env;
use std::fs::{self, File};
use std::io::Read;
use std::path::{Path, PathBuf};
use toml;
fn search_template_in_dirs<'a>(dirs: &'a [PathBuf], path: &Path) -> Option<&'a PathBuf> {
dirs.iter().find(|dir| dir.join(path).exists())
}
pub fn get_template_source(tpl_path: &Path) -> String {
let dirs = template_dirs();
let path = search_template_in_dirs(&dirs, tpl_path)
.map(|dir| dir.join(tpl_path))
.expect(&format!(
"template file '{}' does not exist",
tpl_path.to_str().unwrap()
));
let mut f = match File::open(&path) {
Err(_) => panic!("unable to open template file '{}'", &path.to_str().unwrap()),
Ok(f) => f,
};
let mut s = String::new();
f.read_to_string(&mut s).unwrap();
if s.ends_with('\n') {
let _ = s.pop();
}
s
}
pub fn find_template_from_path(path: &str, start_at: Option<&Path>) -> PathBuf {
let dirs = template_dirs();
if let Some(rel) = start_at {
let root = search_template_in_dirs(&dirs, rel).expect(&format!(
"unable to find previously available template file '{}'",
rel.to_str().unwrap()
));
let fs_rel_path = root.join(rel).with_file_name(path);
if fs_rel_path.exists() {
return fs_rel_path.strip_prefix(&root).unwrap().to_owned();
}
}
let path = Path::new(path);
search_template_in_dirs(&dirs, &path).expect(&format!(
"template {:?} not found in directories {:?}",
path.to_str().unwrap(),
dirs
));
path.to_owned()
}
pub fn template_dirs() -> Vec<PathBuf> {
Config::from_file().dirs
}
struct Config {
dirs: Vec<PathBuf>,
}
impl Config {
fn from_file() -> Config {
let root = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
let filename = root.join(CONFIG_FILE_NAME);
let default = vec![root.join("templates")];
let dirs = if filename.exists() {
let config_str = fs::read_to_string(&filename)
.expect(&format!("unable to read {}", filename.to_str().unwrap()));
let raw: RawConfig = toml::from_str(&config_str)
.expect(&format!("invalid TOML in {}", filename.to_str().unwrap()));
raw.dirs
.map(|dirs| dirs.into_iter().map(|dir| root.join(dir)).collect())
.unwrap_or_else(|| default)
} else {
default
};
Config { dirs }
}
}
#[derive(Deserialize)]
struct RawConfig {
dirs: Option<Vec<String>>,
}
static CONFIG_FILE_NAME: &str = "askama.toml";
#[cfg(test)]
mod tests {
use super::Path;
use super::{find_template_from_path, get_template_source};
#[test]
fn get_source() {
assert_eq!(get_template_source(Path::new("sub/b.html")), "bar");
}
#[test]
fn find_absolute() {
let path = find_template_from_path("sub/b.html", Some(Path::new("a.html")));
assert_eq!(path, Path::new("sub/b.html"));
}
#[test]
#[should_panic]
fn find_relative_nonexistent() {
find_template_from_path("b.html", Some(Path::new("a.html")));
}
#[test]
fn find_relative() {
let path = find_template_from_path("c.html", Some(Path::new("sub/b.html")));
assert_eq!(path, Path::new("sub/c.html"));
}
#[test]
fn find_relative_sub() {
let path = find_template_from_path("sub1/d.html", Some(Path::new("sub/b.html")));
assert_eq!(path, Path::new("sub/sub1/d.html"));
}
}
|
