give render_bytes enough information to right-justify

1 files changed, 13 insertions, 5 deletions

diff --git a/main.rs b/main.rs
index 848c041..e47efda 100644
--- a/main.rs
+++ b/main.rs
@@ -166,7 +166,7 @@ impl Edits {
 }
 
 trait EditMode {
-    fn render_bytes(&self, cursor: u64, start: u64, bytes: std::slice::Iter<u8>) -> String;
+    fn render_bytes(&self, cursor: u64, width: u16, start: u64, bytes: std::slice::Iter<u8>) -> String;
     // translates from the width of the display (terminal)
     // to the number of bytes this edit mode can display
     fn element_width(&self, display_width: u16) -> u64;
@@ -179,7 +179,7 @@ struct BinaryMode {
 }
 
 impl EditMode for BinaryMode {
-    fn render_bytes(&self, cursor: u64, start: u64, bytes: std::slice::Iter<u8>) -> String {
+    fn render_bytes(&self, cursor: u64, width: u16, start: u64, bytes: std::slice::Iter<u8>) -> String {
         let mut text = "".to_owned();
 //        let mut ascii_text = "".to_owned();
         let col_size = 1;
@@ -222,7 +222,7 @@ struct HexMode {
 }
 
 impl EditMode for HexMode {
-    fn render_bytes(&self, cursor: u64, start: u64, bytes: std::slice::Iter<u8>) -> String {
+    fn render_bytes(&self, cursor: u64, width: u16, start: u64, bytes: std::slice::Iter<u8>) -> String {
         let mut text = "".to_owned();
         let mut ascii_text = "".to_owned();
         let col_size = 4;
@@ -253,7 +253,15 @@ impl EditMode for HexMode {
             }
             i = i + 1;
         }
-        format!("0x{:08x}: {} {}", start, text, ascii_text).to_owned()
+        /*
+         *                   12 == "<address>: "
+         *                        i / col_size for the extra space between columns
+         *                                i * 3 for 3 characters per byte
+         *                                              + 1 for padding..
+         */
+        let hex_line_width = 12 + i / col_size + i * 3 + 1;
+        let padding = format!("{: >line_width$}", "", line_width = width as usize - hex_line_width - i);
+        format!("0x{:08x}: {}{}{}", start, text, padding, ascii_text).to_owned()
     }
     fn element_width(&self, display_width: u16) -> u64 {
         (display_width as u64 - 13) / 17 * 4
@@ -623,7 +631,7 @@ fn render_interface(state: &mut Program) {
             let view = &state.edit_views[j];
             let slice_start = width * i;
             let slice_end = slice_start + width;
-            write!(iface, "{}", view.render_bytes(state.cursor, start as u64 + slice_start, buffer[(slice_start as usize)..(slice_end as usize)].iter())).unwrap();
+            write!(iface, "{}", view.render_bytes(state.cursor, state.width, start as u64 + slice_start, buffer[(slice_start as usize)..(slice_end as usize)].iter())).unwrap();
             if i < state.lines_to_draw() - 1 || j < (state.edit_views.len() - 1) {
                 write!(iface, "\n").unwrap();
             }