Mercurial > repos > shellac > sam_consensus_v3

annotate env/bin/Activate.ps1 @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 <#
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2 .Synopsis
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3 Activate a Python virtual environment for the current PowerShell session.
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4
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5 .Description
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6 Pushes the python executable for a virtual environment to the front of the
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7 $Env:PATH environment variable and sets the prompt to signify that you are
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8 in a Python virtual environment. Makes use of the command line switches as
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9 well as the `pyvenv.cfg` file values present in the virtual environment.
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10
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11 .Parameter VenvDir
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12 Path to the directory that contains the virtual environment to activate. The
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13 default value for this is the parent of the directory that the Activate.ps1
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14 script is located within.
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15
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16 .Parameter Prompt
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17 The prompt prefix to display when this virtual environment is activated. By
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18 default, this prompt is the name of the virtual environment folder (VenvDir)
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19 surrounded by parentheses and followed by a single space (ie. '(.venv) ').
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20
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21 .Example
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22 Activate.ps1
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23 Activates the Python virtual environment that contains the Activate.ps1 script.
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24
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25 .Example
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26 Activate.ps1 -Verbose
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27 Activates the Python virtual environment that contains the Activate.ps1 script,
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28 and shows extra information about the activation as it executes.
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29
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30 .Example
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31 Activate.ps1 -VenvDir C:\Users\MyUser\Common\.venv
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32 Activates the Python virtual environment located in the specified location.
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33
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34 .Example
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35 Activate.ps1 -Prompt "MyPython"
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36 Activates the Python virtual environment that contains the Activate.ps1 script,
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37 and prefixes the current prompt with the specified string (surrounded in
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38 parentheses) while the virtual environment is active.
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39
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40 .Notes
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41 On Windows, it may be required to enable this Activate.ps1 script by setting the
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42 execution policy for the user. You can do this by issuing the following PowerShell
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43 command:
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44
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45 PS C:\> Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
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46
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47 For more information on Execution Policies:
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48 https://go.microsoft.com/fwlink/?LinkID=135170
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49
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50 #>
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51 Param(
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52 [Parameter(Mandatory = $false)]
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53 [String]
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54 $VenvDir,
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55 [Parameter(Mandatory = $false)]
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56 [String]
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57 $Prompt
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58 )
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59
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60 <# Function declarations --------------------------------------------------- #>
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61
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62 <#
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63 .Synopsis
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64 Remove all shell session elements added by the Activate script, including the
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65 addition of the virtual environment's Python executable from the beginning of
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66 the PATH variable.
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67
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68 .Parameter NonDestructive
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69 If present, do not remove this function from the global namespace for the
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70 session.
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71
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72 #>
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73 function global:deactivate ([switch]$NonDestructive) {
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74 # Revert to original values
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75
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76 # The prior prompt:
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77 if (Test-Path -Path Function:_OLD_VIRTUAL_PROMPT) {
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78 Copy-Item -Path Function:_OLD_VIRTUAL_PROMPT -Destination Function:prompt
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79 Remove-Item -Path Function:_OLD_VIRTUAL_PROMPT
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80 }
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81
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82 # The prior PYTHONHOME:
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83 if (Test-Path -Path Env:_OLD_VIRTUAL_PYTHONHOME) {
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84 Copy-Item -Path Env:_OLD_VIRTUAL_PYTHONHOME -Destination Env:PYTHONHOME
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85 Remove-Item -Path Env:_OLD_VIRTUAL_PYTHONHOME
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86 }
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87
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88 # The prior PATH:
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89 if (Test-Path -Path Env:_OLD_VIRTUAL_PATH) {
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90 Copy-Item -Path Env:_OLD_VIRTUAL_PATH -Destination Env:PATH
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91 Remove-Item -Path Env:_OLD_VIRTUAL_PATH
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92 }
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93
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94 # Just remove the VIRTUAL_ENV altogether:
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95 if (Test-Path -Path Env:VIRTUAL_ENV) {
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96 Remove-Item -Path env:VIRTUAL_ENV
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97 }
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98
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99 # Just remove the _PYTHON_VENV_PROMPT_PREFIX altogether:
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100 if (Get-Variable -Name "_PYTHON_VENV_PROMPT_PREFIX" -ErrorAction SilentlyContinue) {
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101 Remove-Variable -Name _PYTHON_VENV_PROMPT_PREFIX -Scope Global -Force
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102 }
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103
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104 # Leave deactivate function in the global namespace if requested:
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105 if (-not $NonDestructive) {
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106 Remove-Item -Path function:deactivate
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107 }
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108 }
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109
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110 <#
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111 .Description
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112 Get-PyVenvConfig parses the values from the pyvenv.cfg file located in the
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113 given folder, and returns them in a map.
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114
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115 For each line in the pyvenv.cfg file, if that line can be parsed into exactly
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116 two strings separated by `=` (with any amount of whitespace surrounding the =)
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117 then it is considered a `key = value` line. The left hand string is the key,
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118 the right hand is the value.
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119
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120 If the value starts with a `'` or a `"` then the first and last character is
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121 stripped from the value before being captured.
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122
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123 .Parameter ConfigDir
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124 Path to the directory that contains the `pyvenv.cfg` file.
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125 #>
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126 function Get-PyVenvConfig(
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127 [String]
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128 $ConfigDir
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129 ) {
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130 Write-Verbose "Given ConfigDir=$ConfigDir, obtain values in pyvenv.cfg"
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131
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132 # Ensure the file exists, and issue a warning if it doesn't (but still allow the function to continue).
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133 $pyvenvConfigPath = Join-Path -Resolve -Path $ConfigDir -ChildPath 'pyvenv.cfg' -ErrorAction Continue
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134
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135 # An empty map will be returned if no config file is found.
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136 $pyvenvConfig = @{ }
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137
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138 if ($pyvenvConfigPath) {
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139
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140 Write-Verbose "File exists, parse `key = value` lines"
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141 $pyvenvConfigContent = Get-Content -Path $pyvenvConfigPath
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142
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143 $pyvenvConfigContent | ForEach-Object {
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144 $keyval = $PSItem -split "\s*=\s*", 2
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145 if ($keyval[0] -and $keyval[1]) {
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146 $val = $keyval[1]
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147
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148 # Remove extraneous quotations around a string value.
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149 if ("'""".Contains($val.Substring(0, 1))) {
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150 $val = $val.Substring(1, $val.Length - 2)
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151 }
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152
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153 $pyvenvConfig[$keyval[0]] = $val
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154 Write-Verbose "Adding Key: '$($keyval[0])'='$val'"
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155 }
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156 }
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157 }
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158 return $pyvenvConfig
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159 }
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160
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161
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162 <# Begin Activate script --------------------------------------------------- #>
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163
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164 # Determine the containing directory of this script
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165 $VenvExecPath = Split-Path -Parent $MyInvocation.MyCommand.Definition
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166 $VenvExecDir = Get-Item -Path $VenvExecPath
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167
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168 Write-Verbose "Activation script is located in path: '$VenvExecPath'"
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169 Write-Verbose "VenvExecDir Fullname: '$($VenvExecDir.FullName)"
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170 Write-Verbose "VenvExecDir Name: '$($VenvExecDir.Name)"
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171
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172 # Set values required in priority: CmdLine, ConfigFile, Default
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173 # First, get the location of the virtual environment, it might not be
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174 # VenvExecDir if specified on the command line.
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175 if ($VenvDir) {
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176 Write-Verbose "VenvDir given as parameter, using '$VenvDir' to determine values"
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177 }
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178 else {
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179 Write-Verbose "VenvDir not given as a parameter, using parent directory name as VenvDir."
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180 $VenvDir = $VenvExecDir.Parent.FullName.TrimEnd("\\/")
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181 Write-Verbose "VenvDir=$VenvDir"
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182 }
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183
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184 # Next, read the `pyvenv.cfg` file to determine any required value such
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185 # as `prompt`.
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186 $pyvenvCfg = Get-PyVenvConfig -ConfigDir $VenvDir
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187
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188 # Next, set the prompt from the command line, or the config file, or
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189 # just use the name of the virtual environment folder.
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190 if ($Prompt) {
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191 Write-Verbose "Prompt specified as argument, using '$Prompt'"
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192 }
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193 else {
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194 Write-Verbose "Prompt not specified as argument to script, checking pyvenv.cfg value"
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195 if ($pyvenvCfg -and $pyvenvCfg['prompt']) {
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196 Write-Verbose " Setting based on value in pyvenv.cfg='$($pyvenvCfg['prompt'])'"
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197 $Prompt = $pyvenvCfg['prompt'];
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198 }
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199 else {
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200 Write-Verbose " Setting prompt based on parent's directory's name. (Is the directory name passed to venv module when creating the virutal environment)"
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201 Write-Verbose " Got leaf-name of $VenvDir='$(Split-Path -Path $venvDir -Leaf)'"
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202 $Prompt = Split-Path -Path $venvDir -Leaf
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203 }
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204 }
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205
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206 Write-Verbose "Prompt = '$Prompt'"
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207 Write-Verbose "VenvDir='$VenvDir'"
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208
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209 # Deactivate any currently active virtual environment, but leave the
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210 # deactivate function in place.
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211 deactivate -nondestructive
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212
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213 # Now set the environment variable VIRTUAL_ENV, used by many tools to determine
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214 # that there is an activated venv.
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215 $env:VIRTUAL_ENV = $VenvDir
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216
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217 if (-not $Env:VIRTUAL_ENV_DISABLE_PROMPT) {
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218
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219 Write-Verbose "Setting prompt to '$Prompt'"
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220
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221 # Set the prompt to include the env name
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222 # Make sure _OLD_VIRTUAL_PROMPT is global
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223 function global:_OLD_VIRTUAL_PROMPT { "" }
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224 Copy-Item -Path function:prompt -Destination function:_OLD_VIRTUAL_PROMPT
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225 New-Variable -Name _PYTHON_VENV_PROMPT_PREFIX -Description "Python virtual environment prompt prefix" -Scope Global -Option ReadOnly -Visibility Public -Value $Prompt
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226
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227 function global:prompt {
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228 Write-Host -NoNewline -ForegroundColor Green "($_PYTHON_VENV_PROMPT_PREFIX) "
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229 _OLD_VIRTUAL_PROMPT
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230 }
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231 }
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232
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233 # Clear PYTHONHOME
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234 if (Test-Path -Path Env:PYTHONHOME) {
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235 Copy-Item -Path Env:PYTHONHOME -Destination Env:_OLD_VIRTUAL_PYTHONHOME
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236 Remove-Item -Path Env:PYTHONHOME
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237 }
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238
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239 # Add the venv to the PATH
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240 Copy-Item -Path Env:PATH -Destination Env:_OLD_VIRTUAL_PATH
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241 $Env:PATH = "$VenvExecDir$([System.IO.Path]::PathSeparator)$Env:PATH"