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use std::env;
use std::fs::File;
use std::io::Read;
use std::path::{Path, PathBuf};
pub fn get_template_source(tpl_path: &Path) -> String {
let mut path = template_dir();
path.push(tpl_path);
let mut f = match File::open(&path) {
Err(_) => {
let msg = format!("unable to open template file '{}'",
&path.to_str().unwrap());
panic!(msg);
},
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<'a>(path: &str, start_at: Option<&Path>) -> PathBuf {
let root = template_dir();
if let Some(rel) = start_at {
let mut fs_rel_path = root.clone();
fs_rel_path.push(rel);
fs_rel_path = fs_rel_path.with_file_name(path);
if fs_rel_path.exists() {
return fs_rel_path.strip_prefix(&root).unwrap().to_owned();
}
}
let mut fs_abs_path = root.clone();
let path = Path::new(path);
fs_abs_path.push(Path::new(path));
if fs_abs_path.exists() {
path.to_owned()
} else {
panic!(format!("template '{:?}' not found", path.to_str()));
}
}
pub fn template_dir() -> PathBuf {
let mut path = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
path.push("templates");
path
}
#[cfg(test)]
mod tests {
use super::{find_template_from_path, get_template_source};
use super::Path;
#[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"));
}
}
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