path: root/askama_shared/src/path.rs

use super::Config;

use std::fs;
use std::path::{Path, PathBuf};

pub fn get_template_source(tpl_path: &Path) -> String {
    match fs::read_to_string(tpl_path) {
        Err(_) => panic!("unable to open template file '{}'", tpl_path.to_str().unwrap()),
        Ok(mut source) => {
            if source.ends_with('\n') {
                let _ = source.pop();
            }
            source
        }
    }
}

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::new();
    for dir in &config.dirs {
        let rooted = dir.join(path);
        if rooted.exists() {
            return rooted;
        }
    }

    panic!("template {:?} not found in directories {:?}", path, config.dirs)
}

#[cfg(test)]
mod tests {
    use super::{find_template_from_path, get_template_source};
    use std::env;
    use std::path::{Path, PathBuf};

    fn assert_eq_rooted(actual: &Path, expected: &str) {
        let mut root = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
        root.push("templates");
        let mut inner = PathBuf::new();
        inner.push(expected);
        assert_eq!(actual.strip_prefix(root).unwrap(), inner);
    }

    #[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_eq_rooted(&path, "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_eq_rooted(&path, "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_eq_rooted(&path, "sub/sub1/d.html");
    }
}