# Migration notes

Migration and deprecation notes for libtmux are here, see {ref}`changelog` as
well.

```{admonition} Welcome on board! 👋
1. 📌 For safety, **always** pin the package
2. 📖 Check the migration notes _(You are here)_
3. 📣 If you feel something got deprecated and it interrupted you - past, present, or future - voice your opinion on the [tracker].

   We want to make libtmux fun, reliable, and useful for users.

   API changes can be painful.

   If we can do something to draw the sting, we'll do it. We're taking a balanced approach. That's why these notes are here!

   (Please pin the package. 🙏)

   [tracker]: https://github.com/tmux-python/libtmux/discussions
```

## Upcoming Release

_Detailed migration steps for the next version will be posted here._

<!-- To the maintainers and contributors: please add migration details for the upcoming release here -->

## libtmux 0.46.0 (2025-02-25)

#### Imports removed from libtmux.test (#580)

Root-level of imports from `libtmux.test` are no longer possible.

```python
# Before 0.46.0
from libtmux.test import namer
```

```python
# From 0.46.0 onward
from libtmux.test.named import namer
```

Same thing with constants:

```python
# Before 0.46.0
from libtmux.test import (
  RETRY_INTERVAL_SECONDS,
  RETRY_TIMEOUT_SECONDS,
  TEST_SESSION_PREFIX
)
```

```python
# From 0.46.0 onward
from libtmux.test.constants import (
  RETRY_INTERVAL_SECONDS,
  RETRY_TIMEOUT_SECONDS,
  TEST_SESSION_PREFIX
)
```

## libtmux 0.45.0 (2025-02-23)

### Test helpers: Module moves

Test helper functionality has been split into focused modules (#578):

- `libtmux.test` module split into:
  - `libtmux.test.constants`: Test-related constants (`TEST_SESSION_PREFIX`, etc.)
  - `libtmux.test.environment`: Environment variable mocking
  - `libtmux.test.random`: Random string generation utilities
  - `libtmux.test.temporary`: Temporary session/window management

**Breaking**: Import paths have changed. Update imports:

```python
# Old (0.44.x and earlier)
from libtmux.test import (
    TEST_SESSION_PREFIX,
    get_test_session_name,
    get_test_window_name,
    namer,
    temp_session,
    temp_window,
    EnvironmentVarGuard,
)
```

```python
# New (0.45.0+)
from libtmux.test.constants import TEST_SESSION_PREFIX
from libtmux.test.environment import EnvironmentVarGuard
from libtmux.test.random import get_test_session_name, get_test_window_name, namer
from libtmux.test.temporary import temp_session, temp_window
```

## 0.35.0: Commands require explicit targets (2024-03-17)

### Commands require explicit targets (#535)

- {meth}`Server.cmd()`, {meth}`Session.cmd()`, {meth}`Window.cmd()`, {meth}`Pane.cmd()` require passing `target` instead of `['-t', target]`, `['-tTargetName']`, etc. This change is to avoid issues mistakenly interpreting `-t` in other shell values as targets.

  Before:

  ```python
  session.cmd('send-keys', 'echo hello', '-t', '0')
  ```

  With 0.35.0 and after:

  ```python
  session.cmd('send-keys', 'echo hello', target='0')
  ```

## 0.33.0: Deprecations for splitting (2024-03-03)

### Deprecations (#532)

- `Window.split_window()` to {meth}`Window.split()`
- `Pane.split_window()` to {meth}`Pane.split()`

## 0.31.0: Renaming and command cleanup (2024-02-17)

### Cleanups (#527)

- Commands: Param change

  {meth}`Server.cmd()`, {meth}`Session.cmd()`, {meth}`Window.cmd()`, {meth}`Pane.cmd()`

  - Use `cmd: str` as first positional
  - Removed unused keyword arguments `**kwargs`

### Renamings (#527)

- `Session.attached_window` renamed to {meth}`Session.active_window`
  - `Session.attached_window` deprecated
- `Session.attached_pane` renamed to {meth}`Session.active_pane`
  - `Session.attached_pane` deprecated
- `Window.attached_pane` renamed to {meth}`Window.active_pane`
  - `Window.attached_pane` deprecated

## 0.28.0: Resizing and detached by default (2024-02-15)

#### Detach by default

- {meth}`Session.new_window()` + {meth}`Window.split_window()` no longer attaches by default (#523)

  - 0.28.0 and greater: Defaults to `attach=False`.
  - 0.27.1 and below: Defaults to `attach=True`.

  For the old behavior in 0.28.0 and beyond, pass `attach=True` explicitly.

#### Resizing panes

- `Pane.resize_pane()` renamed to {meth}`Pane.resize()` (via #523)

  This convention will be more consistent with {meth}`Window.resize()`.

- {meth}`Pane.resize_pane()`'s params changed (#523)

  - No longer accepts `-U`, `-D`, `-L`, `-R` directly, instead accepts
    {class}`~libtmux.constants.ResizeAdjustmentDirection` (see below).

    - 0.27.1 and below: `pane.resize_pane("-D", 20)`, `pane.resize_pane("-R", 20)`

    - 0.28.0 and beyond:

      ```python
      from libtmux.constants import ResizeAdjustmentDirection
      pane.resize_pane(adjustment_direction=ResizeAdjustmentDirection.Down, adjustment=25)
      pane.resize_pane(
        adjustment_direction=ResizeAdjustmentDirection.Right, adjustment=25
      )
      ```

## 0.17.0: Simplified attributes (2022-12-26)

### Finding objects / relations

- 0.16 and below: `session._windows()`, `session.list_windows()`, etc.

  0.17 and after: {attr}`session.windows <libtmux.Session.windows>`

- 0.16 and below: `session.find_where({'window_name': my_window})`

  0.17 and after: {meth}`session.windows.get(window_name=my_window, default=None) <libtmux.Session.windows>`

  - If not found and not `default`, raises {exc}`~libtmux._internal.query_list.ObjectDoesNotExist`
  - If multiple objects found, raises {exc}`~libtmux._internal.query_list.MultipleObjectsReturned`

- 0.16 and below: `session.where({'window_name': my_window})`

  0.17 and after: {meth}`session.windows.filter(window_name=my_window) <libtmux.Session.windows>`

### Accessing attributes

- 0.16 and below: `window['id']`

  0.17 and after: `window.id`

- 0.16 and below: `window.get('id')`

  0.17 and after: `window.id`

- 0.16 and below: `window.get('id', None)`

  0.17 and after: `getattr(window, 'id', None)`

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