2 files changed, 27 insertions, 11 deletions
diff --git a/src/layout.rs b/src/layout.rs
index 0ebad27..4c77be4 100644
--- a/src/layout.rs
+++ b/src/layout.rs
@@ -60,7 +60,16 @@ impl Layout {
 
     pub fn new_random_from<R: RngCore>(kbd: &Layout, rng: &mut R) -> Layout {
         let mut layout = kbd.keys;
-        layout.shuffle(rng);
+        // layout.shuffle(rng);
+        let mut count = rng.gen_range(1..=15);
+        while count > 0 {
+            let a = rng.gen_range(0..NUM_KEYS);
+            let b = rng.gen_range(0..NUM_KEYS);
+            let k = layout[b];
+            layout[b] = layout[a];
+            layout[a] = k;
+            count -= 1;
+        }
         Layout::keys_to_layout(layout)
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 905d3c6..cee008c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -10,6 +10,17 @@ use rand_pcg::*;
 use corpus::*;
 use layout::*;
 
+const NUM_CONTESTANTS: usize = 24;
+const SURVIVE_THRESHOLD: usize = 2;
+
+// TODO: Layout is really pre-layout, have something that takes a layout and
+// re-orders columns to balance hands, and keys per column (block really
+// consider index fingers) to balance rows.
+
+// TODO: command line arguments to start at a given layout string, maybe read
+// from file? Might as well make num_contestants and survive_threshold
+// configurable, and number of swaps when generating new layout
+
 fn main() {
     let corpus = Corpus::load("new.txt").unwrap();
     println!("{}", corpus);
@@ -28,16 +39,11 @@ fn main() {
     type Fun = Vec<(Layout, u32)>;
 
     let mut best = std::u32::MAX;
-    let mut layouts: Fun = (0..10)
+    let mut layouts: Fun = (0..NUM_CONTESTANTS)
         .into_iter()
-        .map(|i| {
+        .map(|_| {
             let layout;
-            if i >= 0 {
-                layout = Layout::new_random_from(&starting_layout, &mut rng);
-            } else {
-                layout = starting_layout;
-            }
-
+            layout = Layout::new_random_from(&starting_layout, &mut rng);
             return (layout, corpus.layout_fitness(&layout));
         })
         .collect();
@@ -47,8 +53,9 @@ fn main() {
             .iter()
             .enumerate()
             .map(|(i, (kbd, _))| {
-                if i > 0 {
-                    Layout::new_random_from(kbd, &mut rng)
+                if i > SURVIVE_THRESHOLD {
+                    let parent = rng.gen_range(0..=SURVIVE_THRESHOLD);
+                    Layout::new_random_from(&layouts[parent].0, &mut rng)
                 } else {
                     kbd.clone()
                 }