Read the odd startup option from org-mode files.

src/parser/in_buffer_settings.rs

@@ -1,13 +1,17 @@
 use nom::branch::alt;
+use nom::bytes::complete::is_not;
 use nom::bytes::complete::tag_no_case;
 use nom::character::complete::anychar;
+use nom::character::complete::space1;
 use nom::combinator::map;
 use nom::multi::many0;
 use nom::multi::many_till;
+use nom::multi::separated_list0;
 
 use super::keyword::filtered_keyword;
 use super::keyword_todo::todo_keywords;
 use super::OrgSource;
+use crate::context::HeadlineLevelFilter;
 use crate::error::Res;
 use crate::types::Keyword;
 use crate::GlobalSettings;
@@ -50,6 +54,7 @@ pub(crate) fn apply_in_buffer_settings<'g, 's, 'sf>(
 ) -> Result<GlobalSettings<'g, 's>, String> {
     let mut new_settings = original_settings.clone();
 
+    // Todo Keywords
     for kw in keywords.iter().filter(|kw| {
         kw.key.eq_ignore_ascii_case("todo")
             || kw.key.eq_ignore_ascii_case("seq_todo")
@@ -65,5 +70,18 @@ pub(crate) fn apply_in_buffer_settings<'g, 's, 'sf>(
             .extend(complete_words.into_iter().map(str::to_string));
     }
 
+    // Startup settings
+    for kw in keywords
+        .iter()
+        .filter(|kw| kw.key.eq_ignore_ascii_case("startup"))
+    {
+        let (_remaining, settings) =
+            separated_list0(space1::<&str, nom::error::Error<_>>, is_not(" \t"))(kw.value)
+                .map_err(|err: nom::Err<_>| err.to_string())?;
+        if settings.contains(&"odd") {
+            new_settings.odd_levels_only = HeadlineLevelFilter::Odd;
+        }
+    }
+
     Ok(new_settings)
 }