Share constants for ANSI control codes

mosaic-runtime/src/commonMain/kotlin/com/jakewharton/mosaic/ansi.kt

@@ -0,0 +1,4 @@
+package com.jakewharton.mosaic
+
+internal const val clearLine = "\u001B[K"
+internal const val cursorUp = "\u001B[F"

mosaic-runtime/src/commonMain/kotlin/com/jakewharton/mosaic/rendering.kt

@@ -47,14 +47,14 @@ internal class AnsiRendering : Rendering {
 			clear()
 
 			repeat(lastHeight) {
-				append("\u001B[F") // Cursor up line.
+				append(cursorUp)
 			}
 
 			val staticLines = statics.flatMap { it.render().split("\n") }
 			val lines = canvas.render().split("\n")
 			for (line in staticLines + lines) {
 				append(line)
-				append("\u001B[K") // Clear rest of line.
+				append(clearLine)
 				append('\n')
 			}
 
@@ -64,12 +64,12 @@ internal class AnsiRendering : Rendering {
 				if (i > 0) {
 					append('\n')
 				}
-				append("\u001B[K") // Clear line.
+				append(clearLine)
 			}
 
 			// Move cursor back up to end of the new output.
 			repeat(extraLines - 1) {
-				append("\u001B[F") // Cursor up line.
+				append(cursorUp)
 			}
 
 			lastHeight = lines.size

mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/AnsiRenderingTest.kt

@@ -16,8 +16,8 @@ class AnsiRenderingTest {
 		// TODO We should not draw trailing whitespace.
 		assertEquals(
 			"""
-			|Hello $esc[K
-			|World!$esc[K
+			|Hello $clearLine
+			|World!$clearLine
 			|""".trimMargin(),
 			rendering.render(helloCanvas).toString(),
 		)

mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/MosaicTest.kt

@@ -13,9 +13,9 @@ class MosaicTest {
 			}
 		}
 		assertEquals("""
-			|One  $esc[K
-			|Two  $esc[K
-			|Three$esc[K
+			|One  $clearLine
+			|Two  $clearLine
+			|Three$clearLine
 			|""".trimMargin(), actual)
 	}
 }

mosaic-runtime/src/commonTest/kotlin/com/jakewharton/mosaic/stuff.kt

@@ -1,3 +0,0 @@
-package com.jakewharton.mosaic
-
-internal const val esc = "\u001B"