Sort messages prior to display (#56)

src/main.rs

@@ -56,7 +56,7 @@ fn run_once(files: &[PathBuf], settings: &Settings, cache: bool) -> Result<Vec<M
     debug!("Identified files to lint in: {:?}", duration);
 
     let start = Instant::now();
-    let messages: Vec<Message> = files
+    let mut messages: Vec<Message> = files
         .par_iter()
         .filter(|entry| {
             !settings
@@ -72,6 +72,7 @@ fn run_once(files: &[PathBuf], settings: &Settings, cache: bool) -> Result<Vec<M
         })
         .flatten()
         .collect();
+    messages.sort_unstable();
     let duration = start.elapsed();
     debug!("Checked files in: {:?}", duration);
 

src/message.rs

@@ -1,3 +1,4 @@
+use std::cmp::Ordering;
 use std::fmt;
 
 use colored::Colorize;
@@ -29,6 +30,22 @@ pub struct Message {
     pub filename: String,
 }
 
+impl Ord for Message {
+    fn cmp(&self, other: &Self) -> Ordering {
+        (&self.filename, self.location.row(), self.location.column()).cmp(&(
+            &other.filename,
+            other.location.row(),
+            self.location.column(),
+        ))
+    }
+}
+
+impl PartialOrd for Message {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
 impl fmt::Display for Message {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(