added map2

src/glitzer.gleam

@@ -14,6 +14,7 @@ pub fn main() {
 
   do_something(bar, 0)
   do_something_else()
+  do_cool_shit_with_2_it()
 }
 
 fn do_something(bar, count) {
@@ -40,3 +41,18 @@ fn do_something_else() {
     sleep(100)
   })
 }
+
+fn do_cool_shit_with_2_it() {
+  let bar =
+    progress.default_bar()
+    |> progress.with_length(10)
+  let i1 = iterator.range(0, 10)
+  let i2 = iterator.range(100, 150)
+  progress.map2_iterator(i1, i2, bar, fn(bar, e1, e2) {
+    progress.with_left_text(bar, int.to_string(e1) <> " ")
+    |> progress.with_right_text(" " <> int.to_string(e2))
+    |> progress.print_bar
+    sleep(100)
+  })
+  |> iterator.run
+}

src/glitzer/progress.gleam

@@ -406,6 +406,22 @@ fn tick_bar_by_i(bar, i) -> ProgressStyle {
   }
 }
 
+pub fn map2_iterator(
+  iterator1 i1: Iterator(a),
+  iterator2 i2: Iterator(b),
+  bar bar: ProgressStyle,
+  with fun: fn(ProgressStyle, a, b) -> c,
+) -> Iterator(c) {
+  iterator.zip(i1, i2)
+  |> iterator.index
+  |> iterator.map(fn(pair) {
+    let #(pair, i) = pair
+    let #(el1, el2) = pair
+    tick_bar_by_i(bar, i)
+    |> fun(el1, el2)
+  })
+}
+
 pub fn each_iterator(
   over i: Iterator(a),
   bar bar: ProgressStyle,