Nushell activation scripts

src/virtualenv/activation/__init__.py

@@ -4,6 +4,7 @@
 from .batch import BatchActivator
 from .cshell import CShellActivator
 from .fish import FishActivator
+from .nushell import NushellActivator
 from .powershell import PowerShellActivator
 from .python import PythonActivator
 
@@ -14,4 +15,5 @@
     "PythonActivator",
     "BatchActivator",
     "FishActivator",
+    "NushellActivator",
 ]

src/virtualenv/activation/nushell/__init__.py

@@ -0,0 +1,13 @@
+from __future__ import absolute_import, unicode_literals
+
+from virtualenv.util.path import Path
+
+from ..via_template import ViaTemplateActivator
+
+
+class NushellActivator(ViaTemplateActivator):
+    def templates(self):
+        yield Path("activate.nu")
+
+    def as_name(self, template):
+        return template.stem

src/virtualenv/activation/nushell/activate.nu

@@ -0,0 +1,32 @@
+# Setting all environment variables for the venv
+let virtual_env = __VIRTUAL_ENV__
+
+let is_windows = (sys).host.name == "Windows"
+let path-sep = (if $is_windows { ";" } { ":" })
+
+let venv-abs-dir = ($virtual_env | path expand)
+let venv-name = ($venv-abs-dir | path basename)
+let old-path = ($nu.path | str collect ($path-sep))
+
+let new-path = (if ($is_windows) {
+    let venv-path = ([$virtual_env "__BIN_NAME__"] | path join)
+    let new-path = ($nu.path | prepend $venv-path | str collect ($path-sep))
+
+    [[name, value]; [Path $new-path]]
+} {
+    let venv-path = ([$virtual_env "bin"] | path join)
+    let new-path = ($nu.path | prepend $venv-path | str collect ($path-sep))
+
+    [[name, value]; [PATH $new-path]]
+}
+)
+
+let new-env = [[name, value]; [VENV_OLD_PATH $old-path] [VIRTUAL_ENV $venv-name]]
+
+load-env ($new-env | append $new-path)
+
+# Creating the new prompt for the session
+let virtual_prompt = __VIRTUAL_PROMPT__
+
+let new_prompt = ($"build-string '($virtual_prompt) ' (config get prompt | str find-replace "build-string" "")")
+let-env PROMPT_STRING = $new_prompt

src/virtualenv/activation/nushell/deactivate.nu

@@ -0,0 +1,7 @@
+# Setting the old path
+let-env $path-name = $nu.env.VENV_OLD_PATH
+
+# Unleting the environment variables that where created when activating the env
+unlet-env VIRTUAL_ENV
+unlet-env VENV_OLD_PATH
+unlet-env PROMPT_STRING