Expand both ~/ and ~\ regardless of OS

Author: code-asher

src/main/kotlin/com/coder/gateway/util/PathExtensions.kt

@@ -31,13 +31,13 @@ fun expand(path: String): String {
     if (path == "~" || path == "\$HOME" || path == "\${user.home}") {
         return System.getProperty("user.home")
     }
-    if (path.startsWith("~" + File.separator)) {
+    if (path.startsWith("~/") || path.startsWith("~\\")) {
         return Path.of(System.getProperty("user.home"), path.substring(1)).toString()
     }
-    if (path.startsWith("\$HOME" + File.separator)) {
+    if (path.startsWith("\$HOME/") || path.startsWith("\$HOME\\")) {
         return Path.of(System.getProperty("user.home"), path.substring(5)).toString()
     }
-    if (path.startsWith("\${user.home}" + File.separator)) {
+    if (path.startsWith("\${user.home}/" || path.startsWith("\${user.home}\\"))) {
         return Path.of(System.getProperty("user.home"), path.substring(12)).toString()
     }
     return path

src/test/kotlin/com/coder/gateway/util/PathExtensionsTest.kt

@@ -107,8 +107,11 @@ internal class PathExtensionsTest {
 
             // Do not replace if part of a larger string.
             assertEquals(home, expand(it))
-            assertEquals(home, expand(it + File.separator))
+            assertEquals(home, expand(it + "/"))
+            assertEquals(home, expand(it + "\\"))
             assertEquals(it + "hello", expand(it + "hello"))
+            assertEquals(it + "hello/foo", expand(it + "hello/foo"))
+            assertEquals(it + "hello\\foo", expand(it + "hello\\foo"))
         }
     }
 }