Implemented uninstall. Closes #25

Fixed Write-Host issue introduced in last commit
Created User-Prompt in util

Author: FelixSelter

README.md

@@ -67,7 +67,7 @@ Example: `jenv remove jdk15`
 *jenv link `<Executable name>`*  
 Example: `jenv link javac`
 
-10) **COMING SOON: Uninstall jenv and automatically restore a Java version of your choice**
+10) **Uninstall jenv and automatically restore a Java version of your choice**
 *jenv uninstall `<name>`*  
 Example: `jenv uninstall jdk17`
  ## How does this work?

src/jenv-change.psm1

@@ -16,7 +16,7 @@ function Invoke-Change {
         # Check if specified JEnv is avaible
         $jenv = $config.jenvs | Where-Object { $_.name -eq $name }
         if ($null -eq $jenv) {
-            Write-Host 'Theres no JEnv with name {0} Consider using "jenv list"' -f $name
+            Write-Host ('Theres no JEnv with name {0} Consider using "jenv list"' -f $name)
             return
         }
         else {

src/jenv-list.psm1

@@ -1,7 +1,7 @@
 function Invoke-List {
     param (
-        [object]$config,
-        [boolean]$help
+        [Parameter(Mandatory = $true)][object]$config,
+        [Parameter(Mandatory = $true)][boolean]$help
     )
 
     if ($help) {

src/jenv-local.psm1

@@ -33,7 +33,7 @@ function Invoke-Local {
             if ($jenv.path -eq (Get-Location)) {
                 # if path is used replace with new version
                 $jenv.name = $name
-                Write-Output "Your replaced your java version for {0} {1}" -f (Get-Location), $name
+                Write-Output ("Your replaced your java version for {0} {1}" -f (Get-Location), $name)
                 return
             }
         }
@@ -44,6 +44,6 @@ function Invoke-Local {
             name = $name
         }
 
-        Write-Output "{0} is now your local java version for {1}" -f (Get-Location), $name
+        Write-Output ("{0} is now your local java version for {1}" -f (Get-Location), $name)
     }
 }

src/jenv-uninstall.psm1

@@ -0,0 +1,79 @@
+function Invoke-Uninstall {
+    param (
+        [Parameter(Mandatory = $true)][boolean]$help,
+        [Parameter(Mandatory = $true)][object]$config,
+        [Parameter(Mandatory = $true)][string]$name
+    )
+
+    if ($help) {
+        Write-Host '"jenv uninstall" <name>'
+        Write-Host 'This command deletes jenv and restores the specified jenv as java'
+        Write-Host '<name> is the alias you asigned to the path with "jenv add <name> <path>"'
+    }
+    else {
+
+        # Check if specified JEnv is avaible
+        $jenv = $config.jenvs | Where-Object { $_.name -eq $name }
+        if ($null -eq $jenv) {
+            Write-Host ('Theres no JEnv with name {0} Consider using "jenv list"' -f $name)
+            return
+        }
+
+        # Provides the Open-Prompt function
+        Import-Module $PSScriptRoot\util.psm1
+
+        # Abort Uninstall
+        if ((Open-Prompt "Uninstalling JEnv" "Are you sure you want to delete JEnv entirely from this computer?" "Yes", "No" "This will remove JEnv from your computer", "Last chance to abort the disaster" 1) -eq 1) {
+            Write-Host "Aborted uninstallation"
+            return
+        }
+
+        #region Restore the specified java version
+
+        # Restore PATH
+        $userPath = [System.Environment]::GetEnvironmentVariable("PATH", "User").split(";", [System.StringSplitOptions]::RemoveEmptyEntries)
+        $systemPath = [System.Environment]::GetEnvironmentVariable("PATH", "MACHINE").split(";", [System.StringSplitOptions]::RemoveEmptyEntries)
+
+        # Filter out the jenv path
+        $root = (get-item $PSScriptRoot).parent.fullname
+        $userPath = ($userPath | Where-Object { $_ -ne $root } ) -join ";"
+        $systemPath = ($systemPath | Where-Object { $_ -ne $root } ) -join ";"
+
+        #Update user path
+        $userPath = $userPath + ";" + $jenv.path + "\bin"
+
+        # Set the new PATH
+        $path = $userPath + ";" + $systemPath
+        $Env:PATH = $path # Set for powershell users
+        if ($output) {
+            Set-Content -path "jenv.path.tmp" -value $path # Create temp file so no restart of the active shell is required
+        }
+
+        # Restore JAVA_HOME
+        $Env:JAVA_HOME = $jenv.path # Set for powershell users
+        if ($output) {
+            Set-Content -path "jenv.home.tmp" -value $jenv.path # Create temp file so no restart of the active shell is required
+        }
+
+        # Set globally
+        Write-Host "JEnv is changing your environment variables. This process could take longer"
+        [System.Environment]::SetEnvironmentVariable("JAVA_HOME", $javahome, [System.EnvironmentVariableTarget]::User)
+        [System.Environment]::SetEnvironmentVariable("PATH", $userPath, [System.EnvironmentVariableTarget]::User) # Set globally
+
+        # Either delete %appdata%/jenv or keep config
+        $uninstall = Open-Prompt "Uninstalling JEnv" "Do you want to keep your config file" "Yes", "No" "If you reinstall JEnv later it will use all your configured java_homes and locals", "If you reinstall JEnv it has to be set up from the ground on. Pick this if you dont plan reinstalling JEnv" 0
+        if ($uninstall -eq 1) {
+            Remove-Item $env:appdata/jenv -recurse -force
+        }
+        #endregion
+
+        # Delete jenv folder
+        Remove-Item (get-item $PSScriptRoot).Parent.FullName -Recurse -Force
+
+        # Exit the script so jenv.ps1 wont continue to run
+        Write-Host "Successfully uninstalled JEnv"
+        Exit 0
+
+
+    }
+}

src/jenv-use.psm1

@@ -28,7 +28,7 @@ function Invoke-Use {
         # Check if specified JEnv is avaible
         $jenv = $config.jenvs | Where-Object { $_.name -eq $name }
         if ($null -eq $jenv) {
-            Write-Host 'Theres no JEnv with name {0} Consider using "jenv list"' -f  $name
+            Write-Host ('Theres no JEnv with name {0} Consider using "jenv list"' -f $name)
             return
         }
         else {

src/jenv.ps1

@@ -18,7 +18,7 @@ param (
     "jenv use <name>"           Applys the given Java-Version locally for the current shell
     "jenv local <name>"         Will use the given Java-Version whenever in this folder. Will set the Java-version for all subfolders as well
     #>
-    [Parameter(Position = 0)][validateset("list", "add", "change", "use", "remove", "local", "getjava", "link")] [string]$action,
+    [Parameter(Position = 0)][validateset("list", "add", "change", "use", "remove", "local", "getjava", "link", "uninstall")] [string]$action,
 
     # Displays this helpful message
     [Alias("h")]
@@ -40,6 +40,7 @@ Import-Module $PSScriptRoot\jenv-use.psm1 -Force
 Import-Module $PSScriptRoot\jenv-local.psm1 -Force
 Import-Module $PSScriptRoot\jenv-getjava.psm1 -Force
 Import-Module $PSScriptRoot\jenv-link.psm1 -Force
+Import-Module $PSScriptRoot\jenv-uninstall.psm1 -Force
 #endregion
 
 #region Installation
@@ -108,7 +109,7 @@ if (!($config | Get-Member global)) {
 #region Apply java_home for jenv local
 $localname = ($config.locals | Where-Object { $_.path -eq (Get-Location) }).name
 $javahome = ($config.jenvs | Where-Object { $_.name -eq $localname }).path
-if ($null -eq $local) {
+if ($null -eq $localname) {
     $javahome = $config.global
 }
 $Env:JAVA_HOME = $javahome # Set for powershell users
@@ -125,21 +126,23 @@ if ($help -and $action -eq "") {
     Write-Host '"jenv use <name>"           Applys the given Java-Version locally for the current shell'
     Write-Host '"jenv local <name>"         Will use the given Java-Version whenever in this folder. Will set the Java-version for all subfolders as well'
     Write-Host '"jenv link <executable>"    Creates shortcuts for executables inside JAVA_HOME. For example "javac"'
+    Write-Host '"jenv uninstall <name>"     Deletes JEnv and restores the specified java version to the system. You may keep your config file'
     Write-Host 'Get help for individual commands using "jenv <list/add/remove/change/use/local> --help"'
 }
 else {
 
     # Call the specified command
     # Action has to be one of the following because of the validateset
     switch ( $action ) {
-        list { Invoke-List $config $help @arguments }
+        list { Invoke-List $config $help }
         add { Invoke-Add $config $help @arguments }
         remove { Invoke-Remove $config $help @arguments }
         use { Invoke-Use $config $help $output @arguments }
         change { Invoke-Change $config $help $output @arguments }
         local { Invoke-Local $config $help @arguments }
         getjava { Get-Java $config }
         link { Invoke-Link $help @arguments }
+        uninstall { Invoke-Uninstall $help $config @arguments }
     }
 
     #region Save the config

src/util.psm1

@@ -0,0 +1,16 @@
+function Open-Prompt {
+    param (
+        [Parameter(Mandatory = $true)][string]$title,
+        [Parameter(Mandatory = $true)][string]$question,
+        [Parameter(Mandatory = $true)][string[]]$choices,
+        [Parameter(Mandatory = $true)][string[]]$choice_descriptions,
+        [Parameter(Mandatory = $true)][int]$default_choice
+    )
+
+    [System.Management.Automation.Host.ChoiceDescription[]] $options = @()
+    for ($i = 0; $i -lt $choices.Length; $i++) {
+        $options += New-Object System.Management.Automation.Host.ChoiceDescription ("&{0}" -f $choices[$i]), $choice_descriptions[$i]
+    }
+
+    return $Host.UI.PromptForChoice($title, $question, $options, $default_choice)
+}