From ce270ba827ceb435b021c5055b6796d426ce7bdc Mon Sep 17 00:00:00 2001
From: Teddy Wing
Date: Thu, 17 Sep 2020 00:21:20 +0200
Subject: main.rs: Print errors with prefix

---
 src/main.rs | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 450b01b..cb3b77c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,7 +17,7 @@ fn main() {
     let matches = match opts.parse(&args[1..]) {
         Ok(m) => m,
         Err(e) => {
-            eprintln!("TODO {}", e);
+            eprintln(&e);
             process::exit(exitcode::NOINPUT);
         },
     };
@@ -30,7 +30,7 @@ fn main() {
         match todos.master_tree() {
             Ok(t) => t,
             Err(e) => {
-                eprintln!("TODO {}", e);
+                eprintln(&e);
                 process::exit(exitcode::USAGE);
             },
         }
@@ -41,7 +41,7 @@ fn main() {
         let oid = match repo.refname_to_id(&refname) {
             Ok(oid) => oid,
             Err(e) => {
-                eprintln!("TODO {}", e);
+                eprintln(&e);
                 process::exit(exitcode::USAGE);
             },
         };
@@ -49,7 +49,7 @@ fn main() {
         match repo.find_tree(oid) {
             Ok(t) => t,
             Err(e) => {
-                eprintln!("TODO {}", e);
+                eprintln(&e);
                 process::exit(exitcode::USAGE);
             },
         }
@@ -57,3 +57,8 @@ fn main() {
 
     todos.write_since(tree, &mut std::io::stdout()).unwrap();
 }
+
+/// Print to standard error with a program-specific prefix.
+fn eprintln<D: std::fmt::Display>(error: &D) {
+    eprintln!("error: {}", error);
+}
-- 
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