use format! compile time magics for indentation

rust-lang · Jun 1, 2016 · af41c54 · af41c54
1 parent c62cce3
commit af41c54
Showing 1 changed file with 10 additions and 5 deletions.
diff --git a/src/bin/miri.rs b/src/bin/miri.rs
@@ -41,14 +41,19 @@ fn main() {
 
 #[miri_run]
 fn init_logger() {
+    const NSPACES: usize = 40;
     let format = |record: &log::LogRecord| {
         // prepend spaces to indent the final string
         let indentation = log_settings::settings().indentation;
-        let spaces = "                                        ";
-        let depth = indentation / spaces.len();
-        let indentation = indentation % spaces.len();
-        let indentation = &spaces[..indentation];
-        format!("{}:{}{:2}{} {}", record.level(), record.location().module_path(), depth, indentation, record.args())
+        let depth = indentation / NSPACES;
+        let indentation = indentation % NSPACES;
+        format!("{lvl}:{module}{depth:2}{indent:<indentation$}{text}",
+            lvl = record.level(),
+            module = record.location().module_path(),
+            depth = depth,
+            indentation = indentation,
+            indent = "",
+            text = record.args())
     };
 
     let mut builder = env_logger::LogBuilder::new();