Update the diff program to use exit code 1 for non-matching diff.

src/compare/diff.rs

@@ -54,6 +54,13 @@ impl DiffResult {
             .iter()
             .any(|child| child.status == DiffStatus::Bad || child.has_bad_children())
     }
+
+    pub fn is_bad(&self) -> bool {
+        match self.status {
+            DiffStatus::Good => !self.has_bad_children(),
+            DiffStatus::Bad => true,
+        }
+    }
 }
 
 pub fn compare_document<'s>(

src/org_compare.rs

@@ -1,5 +1,7 @@
 #![feature(round_char_boundary)]
 #![feature(exit_status_error)]
+use std::process::ExitCode;
+
 use crate::compare::compare_document;
 use crate::init_tracing::init_telemetry;
 use crate::init_tracing::shutdown_telemetry;
@@ -10,7 +12,13 @@ mod compare;
 mod init_tracing;
 mod parser;
 
-fn main() -> Result<(), Box<dyn std::error::Error>> {
+fn main() -> ExitCode {
+    let result = _main().expect("Ran into an error comparing the parses.");
+    ExitCode::from(result)
+}
+
+fn _main() -> Result<u8, Box<dyn std::error::Error>> {
+    let mut ran_into_problems: bool = false;
     init_telemetry()?;
     for org_path in std::env::args().skip(1) {
         let org_contents = std::fs::read_to_string(&org_path)?;
@@ -21,8 +29,15 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         println!("{:#?}", rust_parsed);
         let diff_result = compare_document(&parsed_sexp, &rust_parsed)?;
         diff_result.print()?;
+        if diff_result.is_bad() {
+            ran_into_problems = true;
+        }
     }
     println!("Done.");
     shutdown_telemetry()?;
-    Ok(())
+    if ran_into_problems {
+        Ok(1)
+    } else {
+        Ok(0)
+    }
 }