1 files changed, 85 insertions, 0 deletions
diff --git a/askama_shared/src/path.rs b/askama_shared/src/path.rs
new file mode 100644
index 0000000..86bf6d7
--- /dev/null
+++ b/askama_shared/src/path.rs
@@ -0,0 +1,85 @@
+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"));
+    }
+}