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use std::env;
use std::fs::{self, File};
use std::io::Read;
use std::path::{Path, PathBuf};
use toml;
pub fn get_template_source(tpl_path: &Path) -> String {
let mut f = match File::open(tpl_path) {
Err(_) => panic!("unable to open template file '{}'", tpl_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 {
if let Some(root) = start_at {
let relative = root.with_file_name(path);
if relative.exists() {
return relative.to_owned();
}
}
let config = Config::from_file();
for dir in &config.dirs {
let rooted = dir.join(path);
if rooted.exists() {
return rooted;
}
}
panic!("template {:?} not found in directories {:?}", path, config.dirs)
}
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::{find_template_from_path, get_template_source};
#[test]
fn get_source() {
let path = find_template_from_path("sub/b.html", None);
assert_eq!(get_template_source(&path), "bar");
}
#[test]
fn find_absolute() {
let root = find_template_from_path("a.html", None);
let path = find_template_from_path("sub/b.html", Some(&root));
assert!(path.to_str().unwrap().ends_with("sub/b.html"));
}
#[test]
#[should_panic]
fn find_relative_nonexistent() {
let root = find_template_from_path("a.html", None);
find_template_from_path("b.html", Some(&root));
}
#[test]
fn find_relative() {
let root = find_template_from_path("sub/b.html", None);
let path = find_template_from_path("c.html", Some(&root));
assert!(path.to_str().unwrap().ends_with("sub/c.html"));
}
#[test]
fn find_relative_sub() {
let root = find_template_from_path("sub/b.html", None);
let path = find_template_from_path("sub1/d.html", Some(&root));
assert!(path.to_str().unwrap().ends_with("sub/sub1/d.html"));
}
}
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