Merge pull request #649 from peco/extraoffset-to-const

Move variable to platform specific const

layout.go

@@ -14,7 +14,10 @@ import (
 	"github.com/peco/peco/line"
 )
 
-var extraOffset int = 0
+// extraOffset is a platform-specific constant that adds extra vertical
+// space to layout anchors. On Windows, terminals need an additional line
+// reserved at the bottom. Set per-platform via layout_windows.go and
+// layout_notwindows.go.
 
 // ansiLiner is an optional interface for lines that carry ANSI color attributes.
 type ansiLiner interface {

layout_any.go

@@ -0,0 +1,5 @@
+//go:build !windows
+
+package peco
+
+const extraOffset = 0

layout_windows.go

@@ -1,7 +1,5 @@
 package peco
 
-func init() {
-	// This is the value we pass to anchor offset when we're running
-	// on windows platform
-	extraOffset = 1
-}
+// extraOffset reserves one additional line at the bottom on Windows
+// to account for platform-specific terminal rendering behavior.
+const extraOffset = 1