fix: Erlang bin path to user PATH, don't reinst

- 100MB download was running again, even if installed already
 - need to ensure the bin dir is in PATH for access to erl
 - Handle PATH manip in install and uninstall

Erlang16/tools/chocolateyInstall.ps1

@@ -1,7 +1,22 @@
 $package = 'Erlang'
 $version = 'R16B01'
+$installFolder = 'erl5.10.2'
+$releaseFolder = "$installFolder\releases\$version"
 
 try {
+
+  $installedPath = (Join-Path "${Env:\ProgramFiles(x86)}" $installFolder),
+    (Join-Path $Env:ProgramFiles "$installFolder\bin") |
+    ? { Test-Path $_ } |
+    Select -First 1
+
+  # only way to test for installation of this version is by path on disk
+  if (Test-Path $installedPath)
+  {
+    Write-Host "$package $version is already installed to $installedPath"
+  }
+  else
+  {
     $params = @{
       PackageName = $package;
       FileType = 'exe';
@@ -12,6 +27,14 @@ try {
     }
 
     Install-ChocolateyPackage @params
+  }
+
+  $binPath = (Join-Path "${Env:\ProgramFiles(x86)}" $installFolder),
+    (Join-Path $Env:ProgramFiles "$installFolder\bin") |
+    ? { Test-Path $_ } |
+    Select -First 1
+
+  Install-ChocolateyPath $binPath
 
   Write-ChocolateySuccess $package
 } catch {

Erlang16/tools/chocolateyUninstall.ps1

@@ -19,6 +19,14 @@ try
   }
 
   Uninstall-ChocolateyPackage @uninstallParams
+
+  $binLocation = Join-Path $installPath 'bin'
+  $userPaths = [Environment]::GetEnvironmentVariable('Path', 'User') -split ';' |
+    ? { ($_ -notmatch $binLocation) -and (![String]::IsNullOrEmpty($_)) } |
+    Select-Object -Unique
+
+  [Environment]::SetEnvironmentVariable('Path', ($userPaths -join ';'), 'User')
+
   Write-ChocolateySuccess $package
 }
 catch