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				+<#
 
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				+.Synopsis
 
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				+Activate a Python virtual environment for the current PowerShell session.
 
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				+
 
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				+.Description
 
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				+Pushes the python executable for a virtual environment to the front of the
 
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				+$Env:PATH environment variable and sets the prompt to signify that you are
 
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				+in a Python virtual environment. Makes use of the command line switches as
 
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				+well as the `pyvenv.cfg` file values present in the virtual environment.
 
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				+
 
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				+.Parameter VenvDir
 
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				+Path to the directory that contains the virtual environment to activate. The
 
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				+default value for this is the parent of the directory that the Activate.ps1
 
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				+script is located within.
 
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				+
 
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				+.Parameter Prompt
 
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				+The prompt prefix to display when this virtual environment is activated. By
 
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				+default, this prompt is the name of the virtual environment folder (VenvDir)
 
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				+surrounded by parentheses and followed by a single space (ie. '(.venv) ').
 
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				+
 
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				+.Example
 
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				+Activate.ps1
 
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				+Activates the Python virtual environment that contains the Activate.ps1 script.
 
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				+
 
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				+.Example
 
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				+Activate.ps1 -Verbose
 
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				+Activates the Python virtual environment that contains the Activate.ps1 script,
 
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				+and shows extra information about the activation as it executes.
 
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				+
 
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				+.Example
 
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				+Activate.ps1 -VenvDir C:\Users\MyUser\Common\.venv
 
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				+Activates the Python virtual environment located in the specified location.
 
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				+
 
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				+.Example
 
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				+Activate.ps1 -Prompt "MyPython"
 
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				+Activates the Python virtual environment that contains the Activate.ps1 script,
 
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				+and prefixes the current prompt with the specified string (surrounded in
 
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				+parentheses) while the virtual environment is active.
 
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				+
 
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				+.Notes
 
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				+On Windows, it may be required to enable this Activate.ps1 script by setting the
 
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				+execution policy for the user. You can do this by issuing the following PowerShell
 
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				+command:
 
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				+
 
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				+PS C:\> Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
 
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				+
 
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				+For more information on Execution Policies: 
 
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				+https://go.microsoft.com/fwlink/?LinkID=135170
 
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				+
 
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				+#>
 
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				+Param(
 
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				+    [Parameter(Mandatory = $false)]
 
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				+    [String]
 
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				+    $VenvDir,
 
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				+    [Parameter(Mandatory = $false)]
 
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				+    [String]
 
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				+    $Prompt
 
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				+)
 
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				+
 
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				+<# Function declarations --------------------------------------------------- #>
 
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				+
 
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				+<#
 
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				+.Synopsis
 
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				+Remove all shell session elements added by the Activate script, including the
 
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				+addition of the virtual environment's Python executable from the beginning of
 
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				+the PATH variable.
 
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				+
 
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				+.Parameter NonDestructive
 
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				+If present, do not remove this function from the global namespace for the
 
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				+session.
 
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				+
 
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				+#>
 
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				+function global:deactivate ([switch]$NonDestructive) {
 
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				+    # Revert to original values
 
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				+
 
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				+    # The prior prompt:
 
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				+    if (Test-Path -Path Function:_OLD_VIRTUAL_PROMPT) {
 
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				+        Copy-Item -Path Function:_OLD_VIRTUAL_PROMPT -Destination Function:prompt
 
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				+        Remove-Item -Path Function:_OLD_VIRTUAL_PROMPT
 
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				+    }
 
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				+
 
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				+    # The prior PYTHONHOME:
 
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				+    if (Test-Path -Path Env:_OLD_VIRTUAL_PYTHONHOME) {
 
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				+        Copy-Item -Path Env:_OLD_VIRTUAL_PYTHONHOME -Destination Env:PYTHONHOME
 
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				+        Remove-Item -Path Env:_OLD_VIRTUAL_PYTHONHOME
 
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				+    }
 
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				+
 
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				+    # The prior PATH:
 
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				+    if (Test-Path -Path Env:_OLD_VIRTUAL_PATH) {
 
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				+        Copy-Item -Path Env:_OLD_VIRTUAL_PATH -Destination Env:PATH
 
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				+        Remove-Item -Path Env:_OLD_VIRTUAL_PATH
 
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				+    }
 
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				+
 
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				+    # Just remove the VIRTUAL_ENV altogether:
 
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				+    if (Test-Path -Path Env:VIRTUAL_ENV) {
 
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				+        Remove-Item -Path env:VIRTUAL_ENV
 
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				+    }
 
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				+
 
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				+    # Just remove VIRTUAL_ENV_PROMPT altogether.
 
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				+    if (Test-Path -Path Env:VIRTUAL_ENV_PROMPT) {
 
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				+        Remove-Item -Path env:VIRTUAL_ENV_PROMPT
 
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				+    }
 
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				+
 
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				+    # Just remove the _PYTHON_VENV_PROMPT_PREFIX altogether:
 
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				+    if (Get-Variable -Name "_PYTHON_VENV_PROMPT_PREFIX" -ErrorAction SilentlyContinue) {
 
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				+        Remove-Variable -Name _PYTHON_VENV_PROMPT_PREFIX -Scope Global -Force
 
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				+    }
 
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				+
 
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				+    # Leave deactivate function in the global namespace if requested:
 
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				+    if (-not $NonDestructive) {
 
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				+        Remove-Item -Path function:deactivate
 
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				+    }
 
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				+}
 
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				+
 
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				+<#
 
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				+.Description
 
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				+Get-PyVenvConfig parses the values from the pyvenv.cfg file located in the
 
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				+given folder, and returns them in a map.
 
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				+
 
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				+For each line in the pyvenv.cfg file, if that line can be parsed into exactly
 
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				+two strings separated by `=` (with any amount of whitespace surrounding the =)
 
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				+then it is considered a `key = value` line. The left hand string is the key,
 
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				+the right hand is the value.
 
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				+
 
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				+If the value starts with a `'` or a `"` then the first and last character is
 
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				+stripped from the value before being captured.
 
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				+
 
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				+.Parameter ConfigDir
 
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				+Path to the directory that contains the `pyvenv.cfg` file.
 
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				+#>
 
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				+function Get-PyVenvConfig(
 
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				+    [String]
 
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				+    $ConfigDir
 
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				+) {
 
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				+    Write-Verbose "Given ConfigDir=$ConfigDir, obtain values in pyvenv.cfg"
 
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				+
 
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				+    # Ensure the file exists, and issue a warning if it doesn't (but still allow the function to continue).
 
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				+    $pyvenvConfigPath = Join-Path -Resolve -Path $ConfigDir -ChildPath 'pyvenv.cfg' -ErrorAction Continue
 
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				+
 
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				+    # An empty map will be returned if no config file is found.
 
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				+    $pyvenvConfig = @{ }
 
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				+
 
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				+    if ($pyvenvConfigPath) {
 
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				+
 
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				+        Write-Verbose "File exists, parse `key = value` lines"
 
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				+        $pyvenvConfigContent = Get-Content -Path $pyvenvConfigPath
 
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				+
 
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				+        $pyvenvConfigContent | ForEach-Object {
 
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				+            $keyval = $PSItem -split "\s*=\s*", 2
 
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				+            if ($keyval[0] -and $keyval[1]) {
 
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				+                $val = $keyval[1]
 
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				+
 
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				+                # Remove extraneous quotations around a string value.
 
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				+                if ("'""".Contains($val.Substring(0, 1))) {
 
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				+                    $val = $val.Substring(1, $val.Length - 2)
 
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				+                }
 
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				+
 
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				+                $pyvenvConfig[$keyval[0]] = $val
 
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				+                Write-Verbose "Adding Key: '$($keyval[0])'='$val'"
 
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				+            }
 
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				+        }
 
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				+    }
 
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				+    return $pyvenvConfig
 
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				+}
 
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				+
 
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				+
 
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				+<# Begin Activate script --------------------------------------------------- #>
 
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				+
 
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				+# Determine the containing directory of this script
 
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				+$VenvExecPath = Split-Path -Parent $MyInvocation.MyCommand.Definition
 
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				+$VenvExecDir = Get-Item -Path $VenvExecPath
 
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				+
 
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				+Write-Verbose "Activation script is located in path: '$VenvExecPath'"
 
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				+Write-Verbose "VenvExecDir Fullname: '$($VenvExecDir.FullName)"
 
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				+Write-Verbose "VenvExecDir Name: '$($VenvExecDir.Name)"
 
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				+
 
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				+# Set values required in priority: CmdLine, ConfigFile, Default
 
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				+# First, get the location of the virtual environment, it might not be
 
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				+# VenvExecDir if specified on the command line.
 
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				+if ($VenvDir) {
 
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				+    Write-Verbose "VenvDir given as parameter, using '$VenvDir' to determine values"
 
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				+}
 
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				+else {
 
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				+    Write-Verbose "VenvDir not given as a parameter, using parent directory name as VenvDir."
 
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				+    $VenvDir = $VenvExecDir.Parent.FullName.TrimEnd("\\/")
 
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				+    Write-Verbose "VenvDir=$VenvDir"
 
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				+}
 
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				+
 
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				+# Next, read the `pyvenv.cfg` file to determine any required value such
 
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				+# as `prompt`.
 
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				+$pyvenvCfg = Get-PyVenvConfig -ConfigDir $VenvDir
 
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				+
 
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				+# Next, set the prompt from the command line, or the config file, or
 
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				+# just use the name of the virtual environment folder.
 
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				+if ($Prompt) {
 
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				+    Write-Verbose "Prompt specified as argument, using '$Prompt'"
 
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				+}
 
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				+else {
 
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				+    Write-Verbose "Prompt not specified as argument to script, checking pyvenv.cfg value"
 
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				+    if ($pyvenvCfg -and $pyvenvCfg['prompt']) {
 
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				+        Write-Verbose "  Setting based on value in pyvenv.cfg='$($pyvenvCfg['prompt'])'"
 
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				+        $Prompt = $pyvenvCfg['prompt'];
 
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				+    }
 
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				+    else {
 
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				+        Write-Verbose "  Setting prompt based on parent's directory's name. (Is the directory name passed to venv module when creating the virtual environment)"
 
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				+        Write-Verbose "  Got leaf-name of $VenvDir='$(Split-Path -Path $venvDir -Leaf)'"
 
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				+        $Prompt = Split-Path -Path $venvDir -Leaf
 
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				+    }
 
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				+}
 
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				+
 
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				+Write-Verbose "Prompt = '$Prompt'"
 
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				+Write-Verbose "VenvDir='$VenvDir'"
 
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				+
 
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				+# Deactivate any currently active virtual environment, but leave the
 
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				+# deactivate function in place.
 
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				+deactivate -nondestructive
 
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				+
 
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				+# Now set the environment variable VIRTUAL_ENV, used by many tools to determine
 
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				+# that there is an activated venv.
 
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				+$env:VIRTUAL_ENV = $VenvDir
 
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				+
 
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				+if (-not $Env:VIRTUAL_ENV_DISABLE_PROMPT) {
 
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				+
 
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				+    Write-Verbose "Setting prompt to '$Prompt'"
 
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				+
 
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				+    # Set the prompt to include the env name
 
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				+    # Make sure _OLD_VIRTUAL_PROMPT is global
 
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				+    function global:_OLD_VIRTUAL_PROMPT { "" }
 
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				+    Copy-Item -Path function:prompt -Destination function:_OLD_VIRTUAL_PROMPT
 
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				+    New-Variable -Name _PYTHON_VENV_PROMPT_PREFIX -Description "Python virtual environment prompt prefix" -Scope Global -Option ReadOnly -Visibility Public -Value $Prompt
 
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				+
 
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				+    function global:prompt {
 
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				+        Write-Host -NoNewline -ForegroundColor Green "($_PYTHON_VENV_PROMPT_PREFIX) "
 
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				+        _OLD_VIRTUAL_PROMPT
 
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				+    }
 
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				+    $env:VIRTUAL_ENV_PROMPT = $Prompt
 
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				+}
 
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				+
 
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				+# Clear PYTHONHOME
 
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				+if (Test-Path -Path Env:PYTHONHOME) {
 
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				+    Copy-Item -Path Env:PYTHONHOME -Destination Env:_OLD_VIRTUAL_PYTHONHOME
 
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				+    Remove-Item -Path Env:PYTHONHOME
 
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				+}
 
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				+
 
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				+# Add the venv to the PATH
 
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				+Copy-Item -Path Env:PATH -Destination Env:_OLD_VIRTUAL_PATH
 
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				+$Env:PATH = "$VenvExecDir$([System.IO.Path]::PathSeparator)$Env:PATH"
 
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