diff --git a/logic.typ b/logic.typ
index 0144cfe..a2fbfd3 100644
--- a/logic.typ
+++ b/logic.typ
@@ -204,39 +204,31 @@
   alternatives-match(cases.zip(contents), ..kwargs.named())
 }
 
-#let _items-one-by-one(fn, start: 1, mode: "invisible", ..args) = {
-  let kwargs = args.named()
-  let items = args.pos()
-  let covered-items = items.enumerate().map(
-    ((idx, item)) => uncover((beginning: idx + start), mode: mode, item)
-  )
-  fn(
-    ..kwargs,
-    ..covered-items
-  )
-}
-
-#let list-one-by-one(start: 1, mode: "invisible", ..args) = {
-  _items-one-by-one(list, start: start, mode: mode, ..args)
-}
-
-#let enum-one-by-one(start: 1, mode: "invisible", ..args) = {
-  _items-one-by-one(enum, start: start, mode: mode, ..args)
-}
-
-#let terms-one-by-one(start: 1, mode: "invisible", ..args) = {
-  let kwargs = args.named()
-  let items = args.pos()
-  let covered-items = items.enumerate().map(
-    ((idx, item)) => terms.item(
-      item.term,
-      uncover((beginning: idx + start), mode: mode, item.description)
-    )
-  )
-  terms(
-    ..kwargs,
-    ..covered-items
-  )
+#let reveal-code(start: 1, lines: (), before: gray, after: hide, body) = {
+  lines.insert(0, 0)
+  // lines.push(1000000)
+  let (before-action, after-action) = (before, after).map(c => {
+    if type(c) == color {
+      it => text(fill: c, it.text)
+    } else if c == hide {
+      hide
+    } else {
+      panic("Illegal mode: " + str(c))
+    }
+  })
+  for (idx, (from , to)) in lines.windows(2).enumerate() {
+    show raw.line: it => {
+      if it.number <= from {
+        before-action(it)
+      } else if it.number > to {
+        after-action(it)
+      } else {
+        it
+      }
+    }
+    only(start + idx, body)
+  }
+  only((beginning: start + lines.len()), body)
 }
 
 #let later(body, strand: 1) = {
diff --git a/polylux.typ b/polylux.typ
index 1b6e3b7..739d38c 100644
--- a/polylux.typ
+++ b/polylux.typ
@@ -1,5 +1,5 @@
 // #import "themes/themes.typ"
 #import "logic.typ"
-#import "logic.typ": slide, uncover, only, alternatives, alternatives-match, alternatives-fn, alternatives-cases, one-by-one, item-by-item, list-one-by-one, enum-one-by-one, terms-one-by-one, later, enable-handout-mode
+#import "logic.typ": slide, uncover, only, alternatives, alternatives-match, alternatives-fn, alternatives-cases, one-by-one, item-by-item, reveal-code, later, enable-handout-mode
 #import "utils/utils.typ"
 #import "utils/utils.typ": polylux-outline, big, side-by-side, pdfpc, last-slide-number, slide-number
diff --git a/tests/reveal-code.typ b/tests/reveal-code.typ
new file mode 100644
index 0000000..29f96f4
--- /dev/null
+++ b/tests/reveal-code.typ
@@ -0,0 +1,15 @@
+#import "../polylux.typ": *
+
+#set page(paper: "presentation-16-9")
+
+#slide[
+  #reveal-code(lines: (3, 4, 6), before: silver)[```julia
+    function foo(x)
+      @show x
+      s = sum(x) do xi
+        xi ^ 2 + 3
+      end
+      x ./ s
+    end
+  ```]
+]