Fix feature gating the compare code.

src/main.rs

@@ -1,9 +1,13 @@
 #![feature(round_char_boundary)]
 use std::path::Path;
 
+#[cfg(feature = "compare")]
 use ::organic::parser::document;
+#[cfg(feature = "compare")]
 use organic::compare_document;
+#[cfg(feature = "compare")]
 use organic::emacs_parse_org_document;
+#[cfg(feature = "compare")]
 use organic::parser::sexp::sexp_with_padding;
 
 use crate::init_tracing::init_telemetry;
@@ -21,6 +25,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 
+#[cfg(feature = "compare")]
 fn run_compare<P: AsRef<Path>>(todo_org_path: P) -> Result<(), Box<dyn std::error::Error>> {
     let org_contents = std::fs::read_to_string(todo_org_path.as_ref()).expect("Read org file.");
     let (remaining, rust_parsed) = document(org_contents.as_str()).expect("Org Parse failure");
@@ -49,3 +54,9 @@ fn run_compare<P: AsRef<Path>>(todo_org_path: P) -> Result<(), Box<dyn std::erro
 
     Ok(())
 }
+
+#[cfg(not(feature = "compare"))]
+fn run_compare<P: AsRef<Path>>(_todo_org_path: P) -> Result<(), Box<dyn std::error::Error>> {
+    println!("This program was built with compare disabled. Doing nothing.");
+    Ok(())
+}