From ca69d96b2ad34ca7bc0ba47da63b18c449055dbb Mon Sep 17 00:00:00 2001
From: Corey Butler <corey@coreybutler.com>
Date: Tue, 22 Nov 2022 20:16:21 -0600
Subject: [PATCH] Added simple PATH troubleshooter

---
 utilities/pathfinder/README.md         | 18 ++++++++++
 utilities/pathfinder/src/pathfinder.js | 48 ++++++++++++++++++++++++++
 utilities/pathfinder/start.bat         |  4 +++
 3 files changed, 70 insertions(+)
 create mode 100644 utilities/pathfinder/README.md
 create mode 100644 utilities/pathfinder/src/pathfinder.js
 create mode 100644 utilities/pathfinder/start.bat

diff --git a/utilities/pathfinder/README.md b/utilities/pathfinder/README.md
new file mode 100644
index 0000000..79576e4
--- /dev/null
+++ b/utilities/pathfinder/README.md
@@ -0,0 +1,18 @@
+# pathfinder
+
+This app is used to help identify NVM4W installation problems. The executable is not signed and is intended for troubleshooting purposes only. It is just a troubleshooting tool which is not an officially a supported part of NVM for Windows.
+
+## Usage
+
+Download pathfinder.exe and run it.
+
+The output will look like:
+
+```
+> .\pathfinder.exe
+PATH directories containing node.exe:
+
+  1. C:\Program Files\nodejs (NVM_SYMLINK)
+
+NVM for Windows is correctly positioned in the PATH.
+```
\ No newline at end of file
diff --git a/utilities/pathfinder/src/pathfinder.js b/utilities/pathfinder/src/pathfinder.js
new file mode 100644
index 0000000..e571bf4
--- /dev/null
+++ b/utilities/pathfinder/src/pathfinder.js
@@ -0,0 +1,48 @@
+const paths = new Set()
+const symlinks = new Set()
+const nvm4w = new Set()
+
+// Identify paths with node.exe
+const sources = new Set(Deno.env.get('PATH').split(';'))
+for (const dir of sources.values()) {
+  try {
+    await Deno.stat(`${dir}\\node.exe`)
+    paths.add(dir)
+
+    const i = await Deno.lstat(dir)
+    if (i.isSymlink) {
+      symlinks.add(dir)
+      const real = await Deno.realPath(dir)
+
+      try {
+        await Deno.stat(`${real}\\..\\nvm.exe`)
+        nvm4w.add(dir)
+      } catch (e) {}
+    }
+  } catch (e) {}
+}
+
+const directories = Array.from(paths)
+
+let ok = false
+
+console.log('PATH directories containing node.exe:\n')
+
+for (const key in directories) {
+  const dir = directories[key]
+  const isnvm4w = nvm4w.has(dir)
+  const i = parseInt(key, 10)
+
+  if (i === 0 && isnvm4w) {
+    ok = true
+  }
+
+  console.log(`  ${i + 1}. ${dir}${isnvm4w ? ' (NVM_SYMLINK)' : ''}`)
+}
+
+if (ok) {
+  console.log('\nNVM for Windows is correctly positioned in the PATH.')
+} else {
+  console.log('\nNVM for Windows is INCORRECTLY positioned in the PATH (must be first)')
+  console.log('A prior/alternative installation of Node.js may be preventing NVM for Windows from functioning.')
+}
diff --git a/utilities/pathfinder/start.bat b/utilities/pathfinder/start.bat
new file mode 100644
index 0000000..abed5e5
--- /dev/null
+++ b/utilities/pathfinder/start.bat
@@ -0,0 +1,4 @@
+@echo off
+cls
+deno run --allow-all ./src/pathfinder.js
+@echo on