Replace shell command with activator

docs/cli.md

@@ -657,26 +657,7 @@ Note that this command has no option.
 
 ## shell
 
-The shell command spawns a shell within the project's virtual environment.
-
-By default, the current active shell is detected and used. Failing that,
-the shell defined via the environment variable `SHELL` (on *nix) or
-`COMSPEC` (on Windows) is used.
-
-If a virtual environment does not exist, it will be created.
-
-```bash
-poetry shell
-```
-
-Note that this command starts a new shell and activates the virtual environment.
-
-As such, `exit` should be used to properly exit the shell and the virtual environment instead of `deactivate`.
-
-{{% note %}}
-Poetry internally uses the [Shellingham](https://github.com/sarugaku/shellingham) project to detect current
-active shell.
-{{% /note %}}
+The `shell` command was moved to a plugin: [`poetry-plugin-shell`](https://github.com/python-poetry/poetry-plugin-shell)
 
 ## check
 

docs/managing-environments.md

@@ -76,6 +76,44 @@ special `system` Python version to retrieve the default behavior:
 poetry env use system
 ```
 
+## Activating the environment
+
+{{% note %}}
+Looking for `poetry shell`? It was moved to a plugin: [`poetry-plugin-shell`](https://github.com/python-poetry/poetry-plugin-shell)
+{{% /note %}}
+
+The `poetry env activate` command prints the activate command of the virtual environment to the console.
+You can run the output command manually or feed it to the eval command of your shell to activate the environment.
+This way you won't leave the current shell.
+
+{{< tabs tabTotal="3" tabID1="bash-csh-zsh" tabID2="fish" tabID3="powershell" tabName1="Bash/Zsh/Csh" tabName2="Fish" tabName3="Powershell" >}}
+
+{{< tab tabID="bash-csh-zsh" >}}
+
+```bash
+$ eval $(poetry env activate)
+(test-project-for-test) $  # Virtualenv entered
+```
+
+{{< /tab >}}
+{{< tab tabID="fish" >}}
+
+```bash
+$ eval (poetry env activate)
+(test-project-for-test) $  # Virtualenv entered
+```
+
+{{< /tab >}}
+{{< tab tabID="powershell" >}}
+
+```ps1
+PS1> Invoke-Expression (poetry env activate)
+(test-project-for-test) PS1>  # Virtualenv entered
+```
+
+{{< /tab >}}
+{{< /tabs >}}
+
 ## Displaying the environment information
 
 If you want to get basic information about the currently activated virtual environment,

pyproject.toml

@@ -42,7 +42,6 @@ installer = "^0.7.0"
 keyring = "^25.1.0"
 # packaging uses calver, so version is unclamped
 packaging = ">=24.0"
-pexpect = "^4.7.0"
 pkginfo = "^1.10"
 platformdirs = ">=3.0.0,<5"
 pyproject-hooks = "^1.0.0"
@@ -179,7 +178,6 @@ module = [
     'deepdiff.*',
     'fastjsonschema.*',
     'httpretty.*',
-    'pexpect.*',
     'requests_toolbelt.*',
     'shellingham.*',
     'virtualenv.*',

src/poetry/console/application.py

@@ -62,7 +62,6 @@ def _load() -> Command:
     "remove",
     "run",
     "search",
-    "shell",
     "show",
     "update",
     "version",
@@ -73,6 +72,7 @@ def _load() -> Command:
     "debug info",
     "debug resolve",
     # Env commands
+    "env activate",
     "env info",
     "env list",
     "env remove",

src/poetry/console/commands/env/activate.py

@@ -0,0 +1,69 @@
+from __future__ import annotations
+
+import shlex
+
+from typing import TYPE_CHECKING
+
+import shellingham
+
+from poetry.console.commands.command import Command
+from poetry.utils._compat import WINDOWS
+
+
+if TYPE_CHECKING:
+    from poetry.utils.env import Env
+
+
+class ShellNotSupportedError(Exception):
+    """Raised when a shell doesn't have an activator in virtual environment"""
+
+
+class EnvActivateCommand(Command):
+    name = "env activate"
+    description = "Print the command to activate a virtual environment."
+
+    def handle(self) -> int:
+        from poetry.utils.env import EnvManager
+
+        env = EnvManager(self.poetry).get()
+
+        if command := self._get_activate_command(env):
+            self.line(command)
+            return 0
+        else:
+            raise ShellNotSupportedError(
+                "Discovered shell doesn't have an activator in virtual environment"
+            )
+
+    def _get_activate_command(self, env: Env) -> str:
+        try:
+            shell, _ = shellingham.detect_shell()
+        except shellingham.ShellDetectionFailure:
+            shell = ""
+        if shell == "fish":
+            command, filename = "source", "activate.fish"
+        elif shell == "nu":
+            command, filename = "overlay use", "activate.nu"
+        elif shell == "csh":
+            command, filename = "source", "activate.csh"
+        elif shell in ["powershell", "pwsh"]:
+            command, filename = ".", "Activate.ps1"
+        elif shell == "cmd":
+            command, filename = ".", "activate.bat"
+        else:
+            command, filename = "source", "activate"
+
+        if (activation_script := env.bin_dir / filename).exists():
+            if WINDOWS:
+                return f"{self._quote(str(activation_script), shell)}"
+            return f"{command} {self._quote(str(activation_script), shell)}"
+        return ""
+
+    @staticmethod
+    def _quote(command: str, shell: str) -> str:
+        if WINDOWS:
+            if shell == "cmd":
+                return f'"{command}"'
+            if shell in ["powershell", "pwsh"]:
+                return f'& "{command}"'
+        return shlex.quote(command)

src/poetry/utils/env/base_env.py

@@ -65,6 +65,10 @@ def __init__(self, path: Path, base: Path | None = None) -> None:
 
         self._embedded_pip_path: Path | None = None
 
+    @property
+    def bin_dir(self) -> Path:
+        return self._bin_dir
+
     @property
     def path(self) -> Path:
         return self._path