refactor(tui): extract shared frontend helpers (#37868)

packages/tui/src/util/path-format.ts

@@ -0,0 +1,37 @@
+import path from "path"
+
+export function abbreviateHome(input: string, home: string) {
+  if (!home) return input
+  const paths = windowsPath(home) ? path.win32 : path.posix
+  const relative = paths.relative(home, input)
+  if (!relative) return "~"
+  if (relative === ".." || relative.startsWith(".." + paths.sep) || paths.isAbsolute(relative)) return input
+  return "~/" + relative.split(paths.sep).join("/")
+}
+
+export function formatPath(
+  input: string | undefined,
+  options: { base: string; home?: string; forwardSlashes?: boolean },
+) {
+  if (!input) return ""
+  const windows = windowsPath(options.base)
+  if (!windows && windowsPath(input)) {
+    return options.forwardSlashes ? input.replaceAll("\\", "/") : input
+  }
+
+  const paths = windows ? path.win32 : path.posix
+  const absolute = paths.isAbsolute(input) ? input : paths.resolve(options.base, input)
+  const relative = paths.relative(options.base, absolute)
+  const formatted = !relative
+    ? "."
+    : relative !== ".." && !relative.startsWith(".." + paths.sep) && !paths.isAbsolute(relative)
+      ? relative
+      : options.home
+        ? abbreviateHome(absolute, options.home)
+        : absolute
+  return options.forwardSlashes ? formatted.replaceAll("\\", "/") : formatted
+}
+
+function windowsPath(input: string) {
+  return /^[A-Za-z]:[\\/]/.test(input) || input.startsWith("\\\\")
+}