Move get_property into util.

src/compare/diff.rs

@@ -2,6 +2,7 @@ use std::collections::HashSet;
 
 use super::util::assert_bounds;
 use super::util::assert_name;
+use super::util::get_property;
 use crate::parser::sexp::unquote;
 use crate::parser::sexp::Token;
 use crate::parser::AngleLink;
@@ -397,6 +398,8 @@ fn compare_heading<'s>(
         Ok(_) => {}
     };
 
+    // Compare level
+
     // Compare tags
     let emacs_tags = get_tags_from_heading(emacs)?;
     let emacs_tags: HashSet<_> = emacs_tags.iter().map(|val| val.as_str()).collect();
@@ -483,26 +486,6 @@ fn get_tags_from_heading<'s>(
     Ok(tags)
 }
 
-fn get_property<'s, 'x>(
-    emacs: &'s Token<'s>,
-    key: &'x str,
-) -> Result<Option<&'s Token<'s>>, Box<dyn std::error::Error>> {
-    let children = emacs.as_list()?;
-    let attributes_child = children
-        .iter()
-        .nth(1)
-        .ok_or("Should have an attributes child.")?;
-    let attributes_map = attributes_child.as_map()?;
-    let prop = attributes_map
-        .get(key)
-        .ok_or(format!("Missing {} attribute.", key))?;
-    match prop.as_atom() {
-        Ok("nil") => return Ok(None),
-        _ => {}
-    };
-    Ok(Some(*prop))
-}
-
 fn compare_paragraph<'s>(
     source: &'s str,
     emacs: &'s Token<'s>,