create lay/strain package

The lay/strain package uses the Cassowary algorithm to solve systems of
layout constraints.

1 files changed, 12 insertions, 0 deletions

diff --git a/internal/tag/tag.go b/internal/tag/tag.go
new file mode 100644
index 0000000..197d2d6
--- /dev/null
+++ b/internal/tag/tag.go
@@ -0,0 +1,12 @@
+package tag
+
+type Tagged[V, T any] struct {
+	Val V
+	Tag T
+}
+
+func Tag[V, T any](out chan<- Tagged[V, T], in <-chan V, f func(V) T) {
+	for val := range in {
+		out <- Tagged[V, T]{val, f(val)}
+	}
+}