fix #37: make yank portable

lib/printer.go

@@ -285,7 +285,7 @@ func yankColumns(conf cfg.Config, data *Tabdata) {
 	}
 
 	if yank != "" {
-		clipboard.Primary = true // unix
+		setprimary()
 		if err := clipboard.WriteAll(yank); err != nil {
 			log.Fatalln("error writing string to clipboard:", err)
 		}

lib/ya_darwin.go

@@ -0,0 +1,8 @@
+// +build darwin
+
+package lib
+
+import "github.com/atotto/clipboard"
+
+func setprimary() {
+}

lib/ya_unix.go

@@ -0,0 +1,9 @@
+// +build freebsd linux netbsd openbsd solaris dragonfly
+
+package lib
+
+import "github.com/atotto/clipboard"
+
+func setprimary() {
+  clipboard.Primary = true
+}

lib/ya_windows.go

@@ -0,0 +1,8 @@
+// +build windows
+
+package lib
+
+import "github.com/atotto/clipboard"
+
+func setprimary() {
+}