Added a convenient debug macro

Prints the expression along with it's value. Thanks to Steve Donovan
for giving me the idea at the Rust meetup!

2 files changed, 10 insertions, 2 deletions

diff --git a/src/bin/day_5.rs b/src/bin/day_5.rs
index d689e34..2b24d4c 100644
--- a/src/bin/day_5.rs
+++ b/src/bin/day_5.rs
@@ -17,7 +17,7 @@ fn main() -> Result<(), Box<Error>> {
         polymer
     };
 
-    println!("Base length after reducing: {}", polymer.len());
+    debug!(polymer.len());
 
 
     let mut min_length = polymer.len();
@@ -28,7 +28,7 @@ fn main() -> Result<(), Box<Error>> {
         min_length = cmp::min(min_length, polymer_without_char.len());
     }
 
-    println!("Minimum length found: {}", min_length);
+    debug!(min_length);
 
     Ok(())
 }
diff --git a/src/lib.rs b/src/lib.rs
index 01d6242..72520fe 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -21,3 +21,11 @@ pub fn preprocess_file_lines(lines: Vec<String>) -> Vec<String> {
         .map(|line| line.trim_right().to_string())
         .collect()
 }
+
+
+#[macro_export]
+macro_rules! debug {
+    ( $x:expr ) => {
+        println!("{} = {:?}", stringify!($x), $x);
+    };
+}