Do column width calculations ourselves (speedup)

Instead of stripping the ANSI formatting characters from our strings, work out the length without them and use that. This is per-column, but most of them are simple (just the same number of characters in the non-coloured string).

Sometimes, this is really simple: for example, trwxrwxrwx permissions strings are always going to be ten characters long, and the strings that get returned are chock full of ANSI escape codes.

This should have a small benefit on performance.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/column.rs b/src/column.rs
index 013b07f..d842a86 100644
--- a/src/column.rs
+++ b/src/column.rs
@@ -1,5 +1,7 @@
 use std::iter::repeat;
 
+use ansi_term::Style;
+
 #[derive(PartialEq, Show)]
 pub enum Column {
     Permissions,
@@ -79,3 +81,17 @@ impl Alignment {
         }
     }
 }
+
+pub struct Cell {
+    pub length: usize,
+    pub text: String,
+}
+
+impl Cell {
+    pub fn paint(style: Style, string: &str) -> Cell {
+        Cell {
+            text: style.paint(string).to_string(),
+            length: string.len(),
+        }
+    }
+}