feat: Add support for auto reload by watching a set of files in tasks

Cargo.toml

@@ -129,6 +129,7 @@ rattler_repodata_gateway = { version = "0.22.3", default-features = false }
 rattler_shell = { version = "0.22.24", default-features = false }
 rattler_solve = { version = "1.4.2", default-features = false }
 rattler_virtual_packages = { version = "2.0.8", default-features = false }
+rayon = { version = "1.10.0" }
 
 # Bumping this to a higher version breaks the Windows path handling.
 url = "2.5.4"
@@ -278,6 +279,8 @@ uv-pypi-types = { workspace = true }
 
 ctrlc = { workspace = true }
 fs-err = { workspace = true, features = ["tokio"] }
+notify = "8.0.0"
+notify-debouncer-full = "0.5.0"
 pixi_allocator = { workspace = true, optional = true }
 pixi_build_frontend = { workspace = true }
 pixi_build_types = { workspace = true }
@@ -299,7 +302,7 @@ pixi_uv_conversions = { workspace = true }
 pypi_mapping = { workspace = true }
 pypi_modifiers = { workspace = true }
 rattler_virtual_packages = { workspace = true }
-rayon = "1.10.0"
+rayon = { workspace = true }
 regex = { workspace = true }
 reqwest = { workspace = true, features = [
   "http2",
@@ -342,6 +345,7 @@ uv-requirements-txt = { workspace = true }
 uv-resolver = { workspace = true }
 uv-types = { workspace = true }
 uv-workspace = { workspace = true }
+wax = { workspace = true, features = ["miette"] }
 xxhash-rust = { workspace = true }
 zip = { workspace = true, features = ["deflate", "time"] }
 zstd = { workspace = true }

docs/reference/cli/pixi.md

@@ -20,6 +20,7 @@ pixi [OPTIONS] <COMMAND>
 | [`upgrade`](pixi/upgrade.md) | Checks if there are newer versions of the dependencies and upgrades them in the lockfile and manifest file |
 | [`lock`](pixi/lock.md) | Solve environment and update the lock file without installing the environments |
 | [`run`](pixi/run.md) | Runs task in the pixi environment |
+| [`watch`](pixi/watch.md) | Runs task in the pixi environment and watch files for changes |
 | [`exec`](pixi/exec.md) | Run a command and install it in a temporary environment |
 | [`shell`](pixi/shell.md) | Start a shell in a pixi environment, run `exit` to leave the shell |
 | [`shell-hook`](pixi/shell-hook.md) | Print the pixi environment activation script |

docs/reference/cli/pixi/watch.md

@@ -0,0 +1,73 @@
+<!--- This file is autogenerated. Do not edit manually! -->
+# <code>[pixi](../pixi.md) watch</code>
+
+## About
+Runs task in the pixi environment and watch files for changes
+
+--8<-- "docs/reference/cli/pixi/watch_extender.md:description"
+
+## Usage
+```
+pixi watch [OPTIONS] [TASK]...
+```
+
+## Arguments
+- <a id="arg-<TASK>" href="#arg-<TASK>">`<TASK>`</a>
+:  The pixi task or a task shell command you want to run in the workspace's environment, which can be an executable in the environment's PATH
+<br>May be provided more than once.
+
+## Config Options
+- <a id="arg---tls-no-verify" href="#arg---tls-no-verify">`--tls-no-verify`</a>
+:  Do not verify the TLS certificate of the server
+- <a id="arg---auth-file" href="#arg---auth-file">`--auth-file <AUTH_FILE>`</a>
+:  Path to the file containing the authentication token
+- <a id="arg---pypi-keyring-provider" href="#arg---pypi-keyring-provider">`--pypi-keyring-provider <PYPI_KEYRING_PROVIDER>`</a>
+:  Specifies whether to use the keyring to look up credentials for PyPI
+<br>**options**: `disabled`, `subprocess`
+- <a id="arg---concurrent-solves" href="#arg---concurrent-solves">`--concurrent-solves <CONCURRENT_SOLVES>`</a>
+:  Max concurrent solves, default is the number of CPUs
+- <a id="arg---concurrent-downloads" href="#arg---concurrent-downloads">`--concurrent-downloads <CONCURRENT_DOWNLOADS>`</a>
+:  Max concurrent network requests, default is `50`
+- <a id="arg---force-activate" href="#arg---force-activate">`--force-activate`</a>
+:  Do not use the environment activation cache. (default: true except in experimental mode)
+- <a id="arg---no-completion" href="#arg---no-completion">`--no-completion <NO_COMPLETION>`</a>
+:  Do not source the autocompletion scripts from the environment
+<br>**options**: `true`, `false`
+
+## Update Options
+- <a id="arg---no-install" href="#arg---no-install">`--no-install`</a>
+:  Don't modify the environment, only modify the lock-file
+- <a id="arg---revalidate" href="#arg---revalidate">`--revalidate`</a>
+:  Run the complete environment validation. This will reinstall a broken environment
+- <a id="arg---no-lockfile-update" href="#arg---no-lockfile-update">`--no-lockfile-update`</a>
+:  Don't update lockfile, implies the no-install as well
+- <a id="arg---frozen" href="#arg---frozen">`--frozen`</a>
+:  Install the environment as defined in the lockfile, doesn't update lockfile if it isn't up-to-date with the manifest file
+<br>**env**: `PIXI_FROZEN`
+- <a id="arg---locked" href="#arg---locked">`--locked`</a>
+:  Check if lockfile is up-to-date before installing the environment, aborts when lockfile isn't up-to-date with the manifest file
+<br>**env**: `PIXI_LOCKED`
+- <a id="arg---environment" href="#arg---environment">`--environment (-e) <ENVIRONMENT>`</a>
+:  The environment to run the task in
+- <a id="arg---clean-env" href="#arg---clean-env">`--clean-env`</a>
+:  Use a clean environment to run the task
+- <a id="arg---skip-deps" href="#arg---skip-deps">`--skip-deps`</a>
+:  Don't run the dependencies of the task ('depends-on' field in the task definition)
+- <a id="arg---dry-run" href="#arg---dry-run">`--dry-run (-n)`</a>
+:  Run the task in dry-run mode (only print the command that would run)
+- <a id="arg---help" href="#arg---help">`--help`</a>
+:
+
+## Global Options
+- <a id="arg---manifest-path" href="#arg---manifest-path">`--manifest-path <MANIFEST_PATH>`</a>
+:  The path to `pixi.toml`, `pyproject.toml`, or the workspace directory
+
+## Description
+Runs task in the pixi environment and watch files for changes.
+
+This command is used to run tasks in the pixi environment. The tasks are killed and ran again when the files specified in `inputs` change. It will activate the environment and run the task in the environment. It is using the deno_task_shell to run the task.
+
+`pixi watch` will also update the lockfile and install the environment if it is required.
+
+
+--8<-- "docs/reference/cli/pixi/watch_extender.md:example"

pixi.toml

@@ -67,7 +67,7 @@ test-integration-extra-slow-ci = "pytest --numprocesses=auto --durations=0 --tim
 test-integration-fast = { cmd = "pytest --pixi-build=debug --numprocesses=auto --durations=0 --timeout=100 -m 'not slow and not extra_slow' tests/integration_python", depends-on = [
   "build-debug",
 ] }
-test-integration-slow = { cmd = "pytest --numprocesses=auto --durations=0 --timeout=100 -m 'not extra_slow' tests/integration_python", depends-on = [
+test-integration-slow = { cmd = "pytest --numprocesses=auto --durations=0 --timeout=200 -m 'not extra_slow' tests/integration_python", depends-on = [
   "build-release",
 ] }
 # pass the file to run as an argument to the task