create lay/strain package

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

2 files changed, 23 insertions, 0 deletions

diff --git a/internal/log/log.go b/internal/log/log.go
new file mode 100644
index 0000000..545cd98
--- /dev/null
+++ b/internal/log/log.go
@@ -0,0 +1,11 @@
+package log
+
+import (
+	"log"
+	"os"
+)
+
+var (
+	Out = log.New(os.Stdout, "faiface/gui [info]: ", log.LstdFlags)
+	Err = log.New(os.Stderr, "faiface/gui [error]: ", log.LstdFlags|log.Llongfile)
+)
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)}
+	}
+}