Improve uninstallation on windows wrt #150

Fixes #175

bootstrap-haskell

@@ -416,7 +416,7 @@ if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then
 
 		case $hls_answer in
 			[Yy]*)
-				eghcup --cache install hls || warn "HLS installation failed, continuing anyway"
+				_eghcup --cache install hls || warn "HLS installation failed, continuing anyway"
 				break ;;
 			[Nn]* | "")
 				break ;;
@@ -443,7 +443,7 @@ if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then
 
 		case $stack_answer in
 			[Yy]*)
-				eghcup --cache install stack || warn "Stack installation failed, continuing anyway"
+				_eghcup --cache install stack || warn "Stack installation failed, continuing anyway"
 				break ;;
 			[Nn]* | "")
 				break ;;

bootstrap-haskell.ps1

@@ -333,11 +333,65 @@ if (!(Test-Path -Path ('{0}' -f $MsysDir))) {
 }
 
 Print-Msg -msg 'Creating shortcuts...'
+$uninstallShortCut = @'
+Write-Host 'Removing ghcup toolchain' -ForegroundColor Green
+ghcup nuke
+
+Write-Host 'Unsetting GHCUP_INSTALL_BASE_PREFIX' -ForegroundColor Green
+[Environment]::SetEnvironmentVariable('GHCUP_INSTALL_BASE_PREFIX', $null, [System.EnvironmentVariableTarget]::User)
+
+$ghcupMsys2 = [System.Environment]::GetEnvironmentVariable('GHCUP_MSYS2', 'user')
+$GhcupBasePrefixEnv = [System.Environment]::GetEnvironmentVariable('GHCUP_INSTALL_BASE_PREFIX', 'user')
+
+if ($ghcupMsys2) {
+  $msys2Dir = [IO.Path]::GetFullPath($ghcupMsys2)
+  $baseDir = [IO.Path]::GetFullPath('{0}\ghcup' -f $GhcupBasePrefixEnv)
+
+  if ($msys2Dir.StartsWith($baseDir)) {
+    Write-Host 'Unsetting GHCUP_MSYS2' -ForegroundColor Green
+    [Environment]::SetEnvironmentVariable('GHCUP_MSYS2', $null, [System.EnvironmentVariableTarget]::User)
+  } else {
+    Write-Host ('GHCUP_MSYS2 env variable is set to a non-standard location {0}. Environment variable not unset. Uninstall manually.' -f $msys2Dir) -ForegroundColor Magenta
+  }
+} else {
+  Write-Host 'Unsetting GHCUP_MSYS2' -ForegroundColor Green
+  [Environment]::SetEnvironmentVariable('GHCUP_MSYS2', $null, [System.EnvironmentVariableTarget]::User)
+}
+
+Write-Host 'Removing ghcup from PATH env var' -ForegroundColor Green
+$path = [System.Environment]::GetEnvironmentVariable(
+    'PATH',
+    'user'
+)
+$path = ($path.Split(';') | Where-Object { $_ -ne ('{0}\bin' -f $baseDir) }) -join ';'
+[System.Environment]::SetEnvironmentVariable(
+    'PATH',
+    $path,
+    'user'
+)
+
+Write-Host 'Removing desktop files' -ForegroundColor Green
+$DesktopDir = [Environment]::GetFolderPath("Desktop")
+Remove-Item -LiteralPath ('{0}\Install GHC dev dependencies.lnk' -f $DesktopDir) -Force
+Remove-Item -LiteralPath ('{0}\Mingw haskell shell.lnk' -f $DesktopDir) -Force
+Remove-Item -LiteralPath ('{0}\Mingw package management docs.url' -f $DesktopDir) -Force
+
+Write-Host ('CABAL_DIR env variable is still set to {0} and will be used by cabal regardless of ghcup. You may want to uninstall this manually.' -f [System.Environment]::GetEnvironmentVariable('CABAL_DIR', 'user')) -ForegroundColor Magenta
+Write-Host 'You may remove this script now.' -ForegroundColor Magenta
+
+if ($Host.Name -eq "ConsoleHost")
+{
+    Write-Host "Press any key to continue..."
+    $Host.UI.RawUI.ReadKey("NoEcho,IncludeKeyUp") > $null
+}
+'@
+
 $DesktopDir = [Environment]::GetFolderPath("Desktop")
 $GhcInstArgs = '-mingw64 -mintty -c "pacman --noconfirm -S --needed base-devel gettext autoconf make libtool automake python p7zip patch unzip"'
 Create-Shortcut -SourceExe ('{0}\msys2_shell.cmd' -f $MsysDir) -ArgumentsToSourceExe $GhcInstArgs -DestinationPath ('{0}\Install GHC dev dependencies.lnk' -f $DesktopDir)
 Create-Shortcut -SourceExe ('{0}\msys2_shell.cmd' -f $MsysDir) -ArgumentsToSourceExe '-mingw64' -DestinationPath ('{0}\Mingw haskell shell.lnk' -f $DesktopDir)
 Create-Shortcut -SourceExe 'https://www.msys2.org/docs/package-management' -ArgumentsToSourceExe '' -DestinationPath ('{0}\Mingw package management docs.url' -f $DesktopDir)
+$null = New-Item -Path $DesktopDir -Name "Uninstall Haskell.ps1" -ItemType "file" -Force -Value $uninstallShortCut
 
 Print-Msg -msg ('Adding {0}\bin to Users Path...' -f $GhcupDir)
 Add-EnvPath -Path ('{0}\bin' -f ([System.IO.Path]::GetFullPath("$GhcupDir"))) -Container 'User'

lib/GHCup.hs

@@ -1393,12 +1393,14 @@ rmGhcupDirs = do
     rmEnvFile :: (MonadCatch m, MonadLogger m, MonadIO m) => FilePath -> m ()
     rmEnvFile enFilePath = do
       $logInfo "Removing Ghcup Environment File"
-      hideError doesNotExistErrorType $ liftIO $ deleteFile enFilePath
+      hideErrorDef [doesNotExistErrorType, permissionErrorType] ()
+        $ liftIO $ deleteFile enFilePath
 
     rmConfFile :: (MonadCatch m, MonadLogger m, MonadIO m) => FilePath -> m ()
     rmConfFile confFilePath = do
       $logInfo "removing Ghcup Config File"
-      hideError doesNotExistErrorType $ liftIO $ deleteFile confFilePath
+      hideErrorDef [doesNotExistErrorType, permissionErrorType] ()
+        $ liftIO $ deleteFile confFilePath
 
     rmDir :: (MonadLogger m, MonadIO m, MonadCatch m) => FilePath -> m ()
     rmDir dir = do
@@ -1448,7 +1450,7 @@ rmGhcupDirs = do
 
     deleteFile :: FilePath -> IO ()
     deleteFile filepath = do
-      hideError InappropriateType $ rmFile filepath
+      hideErrorDef [InappropriateType, permissionErrorType] () $ rmFile filepath
 
     removeDirIfEmptyOrIsSymlink :: (MonadCatch m, MonadIO m) => FilePath -> m ()
     removeDirIfEmptyOrIsSymlink filepath =

www/ghcup.css

@@ -132,13 +132,17 @@ hr {
     margin-bottom: 2em;
 }
 
-#platform-instructions-linux > div > pre,
-#platform-instructions-mac > div > pre,
-#platform-instructions-freebsd > div > pre,
-#platform-instructions-win32 > div > pre,
-#platform-instructions-win64 > div > pre,
-#platform-instructions-default > div > div > pre,
-#platform-instructions-unknown > div > div > pre {
+span.code {
+	font-family: 'Lucida Console', monospace;
+}
+
+#platform-instructions-linux div > pre,
+#platform-instructions-mac div > pre,
+#platform-instructions-freebsd div > pre,
+#platform-instructions-win32 div > pre,
+#platform-instructions-win64 div > pre,
+#platform-instructions-default div > div > pre,
+#platform-instructions-unknown div > div > pre {
     background-color: #515151;
     color: white;
     margin-left: auto;

www/index.html

@@ -44,23 +44,40 @@
       <div id="platform-instructions-win32" class="instructions">
         <p>
             To install Haskell,<br/>run the following in a powershell session (as a non-admin user).
-			<div class="command-button"><pre><span class='ghcup-command' id="ghcup-command-powershell">Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; Invoke-WebRequest -UseBasicParsing https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 | Invoke-Expression</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
+			<div>
+			<div class="command-button"><pre><span class='ghcup-command' id="ghcup-command-powershell">Set-ExecutionPolicy Bypass -Scope Process -Force;[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072;Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Invoke-WebRequest https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 -UseBasicParsing))) -ArgumentList $false</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button>
+			</div>
+				<p class="other-help">If you want to run an interactive installation, change <span class='code'>$false</span> to <span class='code'>$true</span> at the end of the script.</p>
+			</div>
 		<p>If you're a Windows Subsystem 2 for Linux user run the following in your terminal, then follow the onscreen instructions to install Haskell.
 		</p>
-		<div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre><button class="tooltip" onclick="copyToClipboard()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
+		<div>
+		<div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre><button class="tooltip" onclick="copyToClipboard()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button>
+		</div>
+		<p class="other-help">WSL1 does not work with ghcup, follow  <a href="https://docs.microsoft.com/en-us/windows/wsl/install-win10">the instructions here</a> to upgrade to WSL2 if needed.</p>
+		</div>
         </p>
-		<p class="other-help">WSL1 does not work with ghcup, follow  <a href="https://docs.microsoft.com/en-us/windows/wsl/install-win10">the instructions here</a> to upgrade to WSL2 if needed.</br>You appear to be running Windows 32-bit. If not, <a class="default-platform-button" href="#">display all supported installers</a>.</p>
+        <hr/>
+		<p class="other-help">You appear to be running Windows 32-bit. If not, <a class="default-platform-button" href="#">display all supported installers</a>.</p>
       </div>
 
       <div id="platform-instructions-win64" class="instructions" style="display: none;">
         <p>
             To install Haskell,<br/>run the following in a powershell session (as a non-admin user).
-			<div class="command-button"><pre><span class='ghcup-command'>Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; Invoke-WebRequest -UseBasicParsing https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 | Invoke-Expression</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
+			<div>
+			<div class="command-button"><pre><span class='ghcup-command'>Set-ExecutionPolicy Bypass -Scope Process -Force;[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072;Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Invoke-WebRequest https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 -UseBasicParsing))) -ArgumentList $false</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button>
+			</div>
+				<p class="other-help">If you want to run an interactive installation, change <span class='code'>$false</span> to <span class='code'>$true</span> at the end of the script.</p>
+			</div>
         </p>
 		<p>If you're a Windows Subsystem 2 for Linux user run the following in your terminal, then follow the onscreen instructions to install Haskell.
 		</p>
-		<div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre><button class="tooltip" onclick="copyToClipboard()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
-		<p class="other-help">WSL1 does not work with ghcup, follow  <a href="https://docs.microsoft.com/en-us/windows/wsl/install-win10">the instructions here</a> to upgrade to WSL2 if needed.</br>You appear to be running Windows 64-bit. If not, <a class="default-platform-button" href="#">display all supported installers</a>.</p>
+		<div>
+		<div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre><button class="tooltip" onclick="copyToClipboard()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button>
+		</div>
+		<p class="other-help">WSL1 does not work with ghcup, follow  <a href="https://docs.microsoft.com/en-us/windows/wsl/install-win10">the instructions here</a> to upgrade to WSL2 if needed.</p>
+		</div>
+		<p class="other-help">You appear to be running Windows 64-bit. If not, <a class="default-platform-button" href="#">display all supported installers</a>.</p>
       </div>
 
       <div id="platform-instructions-unknown" class="instructions" style="display: none;">
@@ -92,7 +109,7 @@
         <div>
           <p>
             If you are running Windows,<br/>run the following in a powershell session (as a non-admin user).
-			<div class="command-button"><pre><span class='ghcup-command'>Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; Invoke-WebRequest -UseBasicParsing https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 | Invoke-Expression</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
+			<div class="command-button"><pre><span class='ghcup-command'>Set-ExecutionPolicy Bypass -Scope Process -Force;[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072;Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Invoke-WebRequest https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 -UseBasicParsing))) -ArgumentList $false</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
           </p>
         </div>
 
@@ -111,7 +128,7 @@
         <div>
           <p>
             If you are running Windows,<br/>run the following in a powershell session (as a non-admin user).
-			<div class="command-button"><pre><span class='ghcup-command'>Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; Invoke-WebRequest -UseBasicParsing https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 | Invoke-Expression</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
+			<div class="command-button"><pre><span class='ghcup-command'>Set-ExecutionPolicy Bypass -Scope Process -Force;[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072;Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Invoke-WebRequest https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 -UseBasicParsing))) -ArgumentList $false</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
           </p>
         </div>