chore: ruff uses 88 by default

.pre-commit-config.yaml

@@ -16,7 +16,14 @@ repos:
     hooks:
       - id: black
         language_version: python
-  - repo: https://github.com/pycqa/flake8
-    rev: 6.0.0
+  - repo: https://github.com/charliermarsh/ruff-pre-commit
+    rev: 'v0.0.245'
     hooks:
-      - id: flake8
+      - id: ruff
+  - repo: local
+    hooks:
+      - id: set-version
+        language: script
+        name: sets __version__ in viv.py
+        entry: ./scripts/bump-dev.sh
+        files: viv.py$

Makefile

@@ -10,6 +10,7 @@ types: ## run mypy
 bump-version: ## update version and tag commit
 	@echo "bumping to version => $(VERSION)"
 	@sed -i 's/__version__ = ".*"/__version__ = "$(VERSION)"/g' src/viv/viv.py
+	@sed 's/--branch .* g/--branch $(VERSION) g/g' README.md
 	@git add src/viv/viv.py && git commit -m "chore: bump version"
 	@git tag v$(VERSION)
 
@@ -22,11 +23,16 @@ install: ## symlink to $PREFIX
 uninstall: ## delete $(PREFIX)/viv
 	rm $(PREFIX)/viv
 
-docs: docs/demo.gif docs/freeze.gif ## generate usage examples
+TAPES = demo freeze list-info-remove
+GIFS := $(foreach n, $(TAPES), docs/$(n).gif)
+docs: $(GIFS) ## generate usage examples
 
 docs/%.gif: docs/%.tape
 	viv rm $$(viv l -q)
-	vhs < $<
+	cd docs; vhs < $*.tape
+
+clean: ## remove build artifacts
+	rm -rf {build,dist}
 
 EXAMPLES = cli.py sys_path.py exe_specific.py frozen_import.py named_env.py scrape.py
 generate-example-vivens: ##

README.md

@@ -11,14 +11,34 @@
 </div>
 <br />
 
+See [usage](https://github.com/daylinmorgan/viv/blob/main/docs/usage.md) for more demo gifs.
+
+---
+
+Python is a great choice to quickly prototype or accomplish small tasks in scripts.
+However, leveraging it's vast ecosystem can be tedious for one-off or rarely used scripts.
+This is were `viv` comes in handy.
+
+`Viv` is a standalone dependency-free `venv` creator.
+It is meant to be invoked in any script that has third-party dependencies,
+prior to loading of any of the external modules.
+
+These `venvs` can be identified by name or by their specification.
+In any case they will be re-used across scripts (and generated on-demand, if needed).
+
+**Importantly**, `viv` will remove your user site directory (`python -m 'import site;print(site.USER_SITE)'`),
+to ensure the script isn't using anything outside the standard library and the `viv`-managed `venv`.
+
 ## Setup
 
+### Manual (Recommended)
+
 Start by cloning the repo and symlinking the script for access to the CLI.
 By default it will symlink `./src/viv/viv.py` to `~/bin/viv`.
 You can set `PREFIX` to symlink to a different location.
 
 ```sh
-git clone git@github.com:daylinmorgan/viv.git ~/.viv
+git clone --depth 1 --branch v22.12a3 git@github.com:daylinmorgan/viv.git ~/.viv
 cd ~/.viv
 make install # or PREFIX=~/.local/bin make install
 ```
@@ -29,20 +49,107 @@ Place this directory on the python path in your rc file.
 export PYTHONPATH="$PYTHONPATH:$HOME/.viv/src"
 ```
 
-Then in any python script with external dependencies you can add this line.
+Advanced users may recognize that principally,
+the module just needs to be recognized at run time
+and the single script at `./src/viv/viv.py` can be invoked directly for the CLI.
+How you accomplish these options is ultimately up to you but the above instructions can get you started.
 
-```python
-__import__("viv").activate("click")
+### Pypi (Not Recommended)
+
+```sh
+pip install viv
 ```
 
+Why is this *not recommended*? Mainly, because `viv` is all about hacking your `sys.path`.
+Placing it in it's own virtual environment or installing in a user site directory may complicate this endeavor.
+
 ## Usage
 
-To remove all viv venvs:
+In any python script with external dependencies you can add this line,
+to automate `vivenv` creation and installation of dependencies.
+
+```python
+__import__("viv").use("click")
+```
+
+To remove all `vivenvs`:
+
 ```sh
 viv remove $(viv list -q)
 ```
 
+# Standalone Viv
+
+*Requires* `python>=3.8`
+
+Supposing you want to increase the portability of your script while still employing `viv`.
+
+The below function can be freely pasted at the top of your scripts and requires
+no modification of your PYTHONPATH or import of additional modules (including downloading/installing `viv`).
+
+It can be auto-generated with for example: `viv freeze <spec> --standalone`.
+
+The only part necessary to modify if copied verbatim from below is the call to `_viv_use`.
+
+output of `viv freeze rich --standalone`:
+```python
+# <<<<< auto-generated by daylinmorgan/viv (v.22.12a3)
+# fmt: off
+def _viv_use(*pkgs: str, track_exe: bool = False, name: str = "") -> None:                               # noqa
+    i,s,m,e,spec=__import__,str,map,lambda x: True if x else False,[*pkgs]                                    # noqa
+    if not {*m(type,pkgs)}=={s}: raise ValueError(f"spec: {pkgs} is invalid")                                 # noqa
+    ge,sys,P,ew=i("os").getenv,i("sys"),i("pathlib").Path,i("sys").stderr.write                               # noqa
+    (cache:=(P(ge("XDG_CACHE_HOME",P.home()/".cache"))/"viv"/"venvs")).mkdir(parents=True,exist_ok=True)      # noqa
+    ((sha256:=i("hashlib").sha256()).update((s(spec)+                                                         # noqa
+     (((exe:=("N/A",s(P(i("sys").executable).resolve()))[e(track_exe)])))).encode()))                         # noqa
+    if (env:=cache/(name if name else (_id:=sha256.hexdigest()))) not in cache.glob("*/") or ge("VIV_FORCE"): # noqa
+        v=e(ge("VIV_VERBOSE"));ew(f"generating new vivenv -> {env.name}\n")                                   # noqa
+        i("venv").EnvBuilder(with_pip=True,clear=True).create(env)                                            # noqa
+        with (env/"pip.conf").open("w") as f:f.write("[global]\ndisable-pip-version-check=true")              # noqa
+        if (p:=i("subprocess").run([env/"bin"/"pip","install","--force-reinstall",*spec],text=True,           # noqa
+            stdout=(-1,None)[v],stderr=(-2,None)[v])).returncode!=0:                                          # noqa
+            if env.is_dir():i("shutil").rmtree(env)                                                           # noqa
+            ew(f"pip had non zero exit ({p.returncode})\n{p.stdout}\n");sys.exit(p.returncode)                # noqa
+        with (env/"viv-info.json").open("w") as f:                                                            # noqa
+            i("json").dump({"created":s(i("datetime").datetime.today()),"id":_id,"spec":spec,"exe":exe},f)    # noqa
+    sys.path = [p for p in (*sys.path,s(*(env/"lib").glob("py*/si*"))) if p!=i("site").USER_SITE]             # noqa
+_viv_use("markdown-it-py==2.2.0", "mdurl==0.1.2", "Pygments==2.14.0", "rich==13.3.2")                    # noqa
+# fmt: on
+# >>>>> code golfed with <3
+```
+
 ## Alternatives
 
-- `pipx`
-- `pip-run`
+### [pip-run](https://github.com/jaraco/pip-run)
+
+```sh
+pip-run (10.0.5)
+├── autocommand (2.2.2)
+├── jaraco-context (4.3.0)
+├── jaraco-functools (3.6.0)
+│   └── more-itertools (9.1.0)
+├── jaraco-text (3.11.1)
+│   ├── autocommand (2.2.2)
+│   ├── inflect (6.0.2)
+│   │   └── pydantic>=1.9.1 (1.10.5)
+│   │       └── typing-extensions>=4.2.0 (4.5.0)
+│   ├── jaraco-context>=4.1 (4.3.0)
+│   ├── jaraco-functools (3.6.0)
+│   │   └── more-itertools (9.1.0)
+│   └── more-itertools (9.1.0)
+├── more-itertools>=8.3 (9.1.0)
+├── packaging (23.0)
+├── path>=15.1 (16.6.0)
+├── pip>=19.3 (23.0.1)
+└── platformdirs (3.1.0)
+```
+
+### [pipx](https://github.com/pypa/pipx/)
+
+```sh
+pipx (1.1.0)
+├── argcomplete>=1.9.4 (2.1.1)
+├── packaging>=20.0 (23.0)
+└── userpath>=1.6.0 (1.8.0)
+    └── click (8.1.3)
+```

docs/demo.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+
+__import__("viv").use("pyfiglet==0.8.post1")  # noqa
+
+from pyfiglet import Figlet
+
+if __name__ == "__main__":
+    f = Figlet(font="slant")
+    figtxt = f.renderText("viv").splitlines()
+    figtxt[-2] += " isn't venv!"
+    print("\n".join(figtxt))

docs/demo.tape

@@ -1,12 +1,12 @@
 Set Height 750
 Set Width 1500
 Set Theme "Catppuccin Mocha"
-Output ./docs/demo.gif
+Output ./demo.gif
 
 Type "viv list"
 Enter
 Sleep 2s
-Type "python examples/cli.py --help"
+Type "python ../examples/cli.py --help"
 Enter
 Sleep 10s
 Type "viv list"
@@ -15,9 +15,9 @@ Sleep 3s
 Type "viv info 841"
 Enter
 Sleep 3s
-Type "python examples/cli.py hello 'prospective viv user!'"
+Type "python ../examples/cli.py hello 'prospective viv user!'"
 Enter
 Sleep 2s
-Type "python examples/cli.py goodbye 'prospective viv user!'"
+Type "python ../examples/cli.py goodbye 'prospective viv user!'"
 Enter
 Sleep 2s

docs/freeze.tape

@@ -1,20 +1,23 @@
 Set Height 750
 Set Width 1500
 Set Theme "Catppuccin Mocha"
-Output ./docs/freeze.gif
+Output ./freeze.gif
 
+Type "viv freeze --help"
+Enter
+Sleep 2s
 Type "viv list"
 Enter
 Sleep 2s
 Type "viv freeze requests bs4"
 Enter
-Sleep 5s
+Sleep 7s
 Type "viv list"
 Enter
 Sleep 3s
 Type "viv freeze requests bs4 --keep --path relative"
 Enter
-Sleep 5s
+Sleep 7s
 Type "viv list"
 Enter
 Sleep 5s

docs/list-info-remove.tape

@@ -0,0 +1,30 @@
+Set Height 750
+Set Width 1500
+Set Theme "Catppuccin Mocha"
+Output ./list-info-remove.gif
+
+Type "cat demo.py"
+Enter
+Sleep 500ms
+Type "python demo.py"
+Enter
+Sleep 3s
+Type "viv list -h"
+Enter
+Sleep 500ms
+Type "viv list -q"
+Enter
+Sleep 1s
+Type "viv info -h"
+Enter
+Sleep 500ms
+Type "viv info "
+Sleep 1s
+Type "f8"
+Enter
+Sleep 1s
+Type "viv remove -h"
+Enter
+Type "viv rm f8"
+Enter
+Sleep 2s

docs/usage.md

@@ -2,6 +2,7 @@
 
 *NOTE*: these demo gif's are a work in progress. If you'd like to see them you can run `vhs` locally with `make docs`.
 
+<div align="center">
 # Demo
 
 <img src="https://raw.githubusercontent.com/daylinmorgan/viv/main/docs/demo.gif" alt="demo" width=600 >
@@ -9,3 +10,9 @@
 # Freeze
 
 <img src="https://raw.githubusercontent.com/daylinmorgan/viv/main/docs/freeze.gif" alt="demo" width=600 >
+
+# List | Info | Remove
+
+<img src="https://raw.githubusercontent.com/daylinmorgan/viv/main/docs/list-info-remove.gif" alt="demo" width=600 >
+
+</div>

examples/cli.py

@@ -4,7 +4,7 @@ It can be convenient to quickly generate a cli for a short script.
 Or to add simple visualization of data using the wonderful rich library.
 """
 
-__import__("viv").activate("typer", "rich-click")  # noqa
+__import__("viv").use("typer", "rich-click")  # noqa
 
 import typer
 

examples/exe_specific.py

@@ -7,7 +7,7 @@ it will generate a new vivenv.
 It may be important to require a exe specificty if you are frequently running
 different version of pythons and rely on c extension modules as in numpy.
 """
-__import__("viv").activate("numpy", "plotext", track_exe=True)  # noqa
+__import__("viv").use("numpy", "plotext", track_exe=True)  # noqa
 
 import numpy as np
 import plotext as plt

examples/frozen_import.py

@@ -6,7 +6,7 @@ This import statement was generated using
 Using viv freeze ensures future runs of this
 script will use the same essential environment
 """
-__import__("viv").activate(
+__import__("viv").use(
     "numpy==1.24.0",
     "pandas==1.5.2",
     "python-dateutil==2.8.2",

examples/named_env.py

@@ -7,7 +7,7 @@ Meaning that it will save it within the viv cache not using a hash.
 *This environment could then be reused by specifying the name*
 """
 
-__import__("viv").activate("rich", name="rich-env")
+__import__("viv").use("rich", name="rich-env")
 
 from rich.console import Console
 from rich.markdown import Markdown

examples/scrape.py

@@ -6,7 +6,7 @@ modified from:
 https://medium.com/analytics-vidhya/a-super-easy-python-script-for-web-scraping-that-anybody-can-use-d3bd6ab86c89
 """
 
-__import__("viv").activate("requests", "bs4", "rich")  # noqa
+__import__("viv").use("requests", "bs4", "rich")  # noqa
 
 import requests
 from bs4 import BeautifulSoup

examples/standalone.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+"""
+Example using the output of `viv freeze pyfiglet --standalone`.
+With this function it's not necessary for
+`viv` to exist anywhere on the system.
+"""
+
+# <<<<< auto-generated by daylinmorgan/viv (v.22.12a3)
+# fmt: off
+def _viv_use(*pkgs: str, track_exe: bool = False, name: str = "") -> None:                               # noqa
+    i,s,m,e,spec=__import__,str,map,lambda x: True if x else False,[*pkgs]                                    # noqa
+    if not {*m(type,pkgs)}=={s}: raise ValueError(f"spec: {pkgs} is invalid")                                 # noqa
+    ge,sys,P,ew=i("os").getenv,i("sys"),i("pathlib").Path,i("sys").stderr.write                               # noqa
+    (cache:=(P(ge("XDG_CACHE_HOME",P.home()/".cache"))/"viv"/"venvs")).mkdir(parents=True,exist_ok=True)      # noqa
+    ((sha256:=i("hashlib").sha256()).update((s(spec)+                                                         # noqa
+     (((exe:=("N/A",s(P(i("sys").executable).resolve()))[e(track_exe)])))).encode()))                         # noqa
+    if (env:=cache/(name if name else (_id:=sha256.hexdigest()))) not in cache.glob("*/") or ge("VIV_FORCE"): # noqa
+        v=e(ge("VIV_VERBOSE"));ew(f"generating new vivenv -> {env.name}\n")                                   # noqa
+        i("venv").EnvBuilder(with_pip=True,clear=True).create(env)                                            # noqa
+        with (env/"pip.conf").open("w") as f:f.write("[global]\ndisable-pip-version-check=true")              # noqa
+        if (p:=i("subprocess").run([env/"bin"/"pip","install","--force-reinstall",*spec],text=True,           # noqa
+            stdout=(-1,None)[v],stderr=(-2,None)[v])).returncode!=0:                                          # noqa
+            if env.is_dir():i("shutil").rmtree(env)                                                           # noqa
+            ew(f"pip had non zero exit ({p.returncode})\n{p.stdout}\n");sys.exit(p.returncode)                # noqa
+        with (env/"viv-info.json").open("w") as f:                                                            # noqa
+            i("json").dump({"created":s(i("datetime").datetime.today()),"id":_id,"spec":spec,"exe":exe},f)    # noqa
+    sys.path = [p for p in (*sys.path,s(*(env/"lib").glob("py*/si*"))) if p!=i("site").USER_SITE]             # noqa
+_viv_use("pyfiglet==0.8.post1")                                                                          # noqa
+# fmt: on
+# >>>>> code golfed with <3
+
+from pyfiglet import Figlet
+
+if __name__ == "__main__":
+    f = Figlet(font="slant")
+    figtxt = f.renderText("viv").splitlines()
+    figtxt[-2] += " isn't venv!"
+    print("\n".join(figtxt))

examples/stopwatch.py

@@ -0,0 +1,141 @@
+#!/usr/bin/env python3
+"""A tui stopwatch built w/textual adapted from their tutorial:
+https://github.com/Textualize/textual/tree/main/docs/examples/tutorial
+"""
+
+__import__("viv").use("textual")
+
+from time import monotonic
+
+from textual.app import App, ComposeResult
+from textual.containers import Container
+from textual.reactive import reactive
+from textual.widgets import Button, Footer, Header, Static
+
+
+class TimeDisplay(Static):
+    """A widget to display elapsed time."""
+
+    start_time = reactive(monotonic)
+    time = reactive(0.0)
+    total = reactive(0.0)
+
+    def on_mount(self) -> None:
+        """Event handler called when widget is added to the app."""
+        self.update_timer = self.set_interval(1 / 60, self.update_time, pause=True)
+
+    def update_time(self) -> None:
+        """Method to update time to current."""
+        self.time = self.total + (monotonic() - self.start_time)
+
+    def watch_time(self, time: float) -> None:
+        """Called when the time attribute changes."""
+        minutes, seconds = divmod(time, 60)
+        hours, minutes = divmod(minutes, 60)
+        self.update(f"{hours:02,.0f}:{minutes:02.0f}:{seconds:05.2f}")
+
+    def start(self) -> None:
+        """Method to start (or resume) time updating."""
+        self.start_time = monotonic()
+        self.update_timer.resume()
+
+    def stop(self):
+        """Method to stop the time display updating."""
+        self.update_timer.pause()
+        self.total += monotonic() - self.start_time
+        self.time = self.total
+
+    def reset(self):
+        """Method to reset the time display to zero."""
+        self.total = 0
+        self.time = 0
+
+
+class Stopwatch(Static):
+    """A stopwatch widget."""
+
+    def on_button_pressed(self, event: Button.Pressed) -> None:
+        """Event handler called when a button is pressed."""
+        button_id = event.button.id
+        time_display = self.query_one(TimeDisplay)
+        if button_id == "start":
+            time_display.start()
+            self.add_class("started")
+        elif button_id == "stop":
+            time_display.stop()
+            self.remove_class("started")
+        elif button_id == "reset":
+            time_display.reset()
+
+    def compose(self) -> ComposeResult:
+        """Create child widgets of a stopwatch."""
+        yield Button("Start", id="start", variant="success")
+        yield Button("Stop", id="stop", variant="error")
+        yield Button("Reset", id="reset")
+        yield TimeDisplay()
+
+
+class StopwatchApp(App):
+    """A Textual app to manage stopwatches."""
+
+    # CSS_PATH = "stopwatch.css"
+    DEFAULT_CSS = """
+Stopwatch {
+    layout: horizontal;
+    background: $boost;
+    height: 5;
+    min-width: 50;
+    margin: 1;
+    padding: 1;
+}
+TimeDisplay {
+    content-align: center middle;
+    text-opacity: 60%;
+    height: 3;
+}
+Button { width: 16; }
+#start { dock: left; }
+#stop { dock: left; display: none; }
+#reset { dock: right; }
+.started {
+    text-style: bold;
+    background: $success;
+    color: $text;
+}
+.started TimeDisplay { text-opacity: 100%; }
+.started #start { display: none }
+.started #stop { display: block }
+.started #reset { visibility: hidden }"""
+
+    BINDINGS = [
+        ("d", "toggle_dark", "Toggle dark mode"),
+        ("a", "add_stopwatch", "Add"),
+        ("r", "remove_stopwatch", "Remove"),
+    ]
+
+    def compose(self) -> ComposeResult:
+        """Called to add widgets to the app."""
+        yield Header()
+        yield Footer()
+        yield Container(Stopwatch(), Stopwatch(), Stopwatch(), id="timers")
+
+    def action_add_stopwatch(self) -> None:
+        """An action to add a timer."""
+        new_stopwatch = Stopwatch()
+        self.query_one("#timers").mount(new_stopwatch)
+        new_stopwatch.scroll_visible()
+
+    def action_remove_stopwatch(self) -> None:
+        """Called to remove a timer."""
+        timers = self.query("Stopwatch")
+        if timers:
+            timers.last().remove()
+
+    def action_toggle_dark(self) -> None:
+        """An action to toggle dark mode."""
+        self.dark = not self.dark
+
+
+if __name__ == "__main__":
+    app = StopwatchApp()
+    app.run()

examples/sys_path.py

@@ -7,7 +7,7 @@ Embed the viv.py on the sys.path at runtime rather than using PYTHONPATH
 __import__("sys").path.append(
     __import__("os").path.expanduser("~/.viv/src")
 )  # noqa # isort: off
-__import__("viv").activate("pyfiglet")  # noqa # isort: off
+__import__("viv").use("pyfiglet")  # noqa # isort: off
 
 import sys
 

examples/wrong_input.py

@@ -1,4 +1,4 @@
 #!/usr/bin/env python3
 
 # ints are not allowed
-__import__("viv").activate(5)
+__import__("viv").use(5)

pyproject.toml

@@ -27,3 +27,11 @@ dev = [
   "pre-commit>=3",
   "mypy>=0.991"
 ]
+
+[tool.ruff]
+ignore = ["E402"]
+
+[tool.mypy]
+warn_return_any = true
+check_untyped_defs = true
+warn_unused_configs = true

scripts/bump-dev.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env sh
+TAG=$(git describe --tags --always --dirty=-dev)
+VERSION="${TAG#v}"
+sed -i "s/__version__ = \".*\"/__version__ = \"$VERSION\"/g" src/viv/viv.py
+git add src/viv/viv.py

setup.cfg

@@ -1,8 +0,0 @@
-[flake8]
-max-line-length = 88
-ignore = E402, W503
-
-[mypy]
-warn_return_any = True
-check_untyped_defs = True
-warn_unused_configs = True

src/viv/__init__.py

@@ -1 +1 @@
-from .viv import activate  # noqa
+from .viv import use  # noqa

src/viv/viv.py

@@ -3,7 +3,7 @@
 
   viv -h
     OR
-  __import__("viv").activate("requests", "bs4")
+  __import__("viv").use("requests", "bs4")
 """
 
 import hashlib
@@ -30,7 +30,7 @@ from pathlib import Path
 from textwrap import dedent, wrap
 from typing import Dict, List, Tuple
 
-__version__ = "22.12a3"
+__version__ = "22.12a3-35-g0d0c66d-dev"
 
 
 @dataclass
@@ -38,9 +38,7 @@ class Config:
     """viv config manager"""
 
     venvcache: Path = (
-        Path(os.getenv("XDG_CACHE_HOME", Path.home() / ".local" / "cache"))
-        / "viv"
-        / "venvs"
+        Path(os.getenv("XDG_CACHE_HOME", Path.home() / ".cache")) / "viv" / "venvs"
     )
 
     def __post_init__(self):
@@ -67,22 +65,22 @@ class Spinner:
     def write_next(self):
         with self._screen_lock:
             if not self.spinner_visible:
-                sys.stdout.write(next(self.spinner))
+                sys.stderr.write(next(self.spinner))
                 self.spinner_visible = True
-                sys.stdout.flush()
+                sys.stderr.flush()
 
     def remove_spinner(self, cleanup=False):
         with self._screen_lock:
             if self.spinner_visible:
-                sys.stdout.write("\b\b\b")
+                sys.stderr.write("\b\b\b")
                 # sys.stdout.write("\b")
                 self.spinner_visible = False
                 if cleanup:
-                    sys.stdout.write("   ")  # overwrite spinner with blank
+                    sys.stderr.write("   ")  # overwrite spinner with blank
                     # sys.stdout.write("\r")  # move to next line
                     # move back then delete the line
-                    sys.stdout.write("\r\033[K")
-                sys.stdout.flush()
+                    sys.stderr.write("\r\033[K")
+                sys.stderr.flush()
 
     def spinner_task(self):
         while self.busy:
@@ -91,18 +89,18 @@ class Spinner:
             self.remove_spinner()
 
     def __enter__(self):
-        if sys.stdout.isatty():
+        if sys.stderr.isatty():
             self._screen_lock = threading.Lock()
             self.busy = True
             self.thread = threading.Thread(target=self.spinner_task)
             self.thread.start()
 
     def __exit__(self, exc_type, exc_val, exc_traceback):  # noqa
-        if sys.stdout.isatty():
+        if sys.stderr.isatty():
             self.busy = False
             self.remove_spinner(cleanup=True)
         else:
-            sys.stdout.write("\r")
+            sys.stderr.write("\r")
 
 
 BOX: Dict[str, str] = {
@@ -136,7 +134,7 @@ class Ansi:
     metavar: str = "\033[33m"  # normal yellow
 
     def __post_init__(self):
-        if os.getenv("NO_COLOR") or not sys.stdout.isatty():
+        if os.getenv("NO_COLOR") or not sys.stderr.isatty():
             for attr in self.__dict__:
                 setattr(self, attr, "")
 
@@ -196,7 +194,6 @@ class Ansi:
         return sizes
 
     def _make_row(self, row) -> str:
-
         return f"  {BOX['v']} " + f" {BOX['sep']} ".join(row) + f" {BOX['v']}"
 
     def _sanitize_row(self, sizes: List[int], row: Tuple[str]) -> Tuple[Tuple[str]]:
@@ -249,9 +246,9 @@ class Ansi:
             )
         )
 
-        sys.stdout.write(f"  {BOX['tl']}{BOX['h']*(sum(sizes)+5)}{BOX['tr']}\n")
-        sys.stdout.write("\n".join(table_rows) + "\n")
-        sys.stdout.write(f"  {BOX['bl']}{BOX['h']*(sum(sizes)+5)}{BOX['br']}\n")
+        sys.stderr.write(f"  {BOX['tl']}{BOX['h']*(sum(sizes)+5)}{BOX['tr']}\n")
+        sys.stderr.write("\n".join(table_rows) + "\n")
+        sys.stderr.write(f"  {BOX['bl']}{BOX['h']*(sum(sizes)+5)}{BOX['br']}\n")
 
 
 a = Ansi()
@@ -269,12 +266,12 @@ def warn(msg):
     echo(f"{a.yellow}warn:{a.end} {msg}", style="yellow")
 
 
-def echo(msg: str, style="magenta", newline=True) -> None:
+def echo(msg: str, style="magenta", newline=True, fd=sys.stderr) -> None:
     """output general message to stdout"""
     output = f"{a.cyan}Viv{a.end}{a.__dict__[style]}::{a.end} {msg}"
     if newline:
         output += "\n"
-    sys.stdout.write(output)
+    fd.write(output)
 
 
 def run(
@@ -334,14 +331,15 @@ def get_hash(spec: Tuple[str, ...] | List[str], track_exe: bool = False) -> str:
     Returns:
         sha256 representation of dependencies for vivenv
     """
-    pkg_hash = hashlib.sha256()
-    pkg_hash.update(str(spec).encode())
 
-    # generate unique venvs for unique python exe's
-    if track_exe:
-        pkg_hash.update(str(Path(sys.executable).resolve()).encode())
+    sha256 = hashlib.sha256()
+    sha256.update(
+        (
+            str(spec) + (str(Path(sys.executable).resolve()) if track_exe else "N/A")
+        ).encode()
+    )
 
-    return pkg_hash.hexdigest()
+    return sha256.hexdigest()
 
 
 class ViVenv:
@@ -349,14 +347,14 @@ class ViVenv:
         self,
         spec: List[str],
         track_exe: bool = False,
-        build_id: str | None = None,
+        id: str | None = None,
         name: str = "",
         path: Path | None = None,
     ) -> None:
         self.spec = spec
         self.exe = str(Path(sys.executable).resolve()) if track_exe else "N/A"
-        self.build_id = build_id if build_id else get_hash(spec, track_exe)
-        self.name = name if name else self.build_id
+        self.id = id if id else get_hash(spec, track_exe)
+        self.name = name if name else self.id
         self.path = path if path else c.venvcache / self.name
 
     @classmethod
@@ -372,15 +370,12 @@ class ViVenv:
             with (c.venvcache / name / "viv-info.json").open("r") as f:
                 venvconfig = json.load(f)
 
-        vivenv = cls(
-            name=name, spec=venvconfig["spec"], build_id=venvconfig["build_id"]
-        )
+        vivenv = cls(name=name, spec=venvconfig["spec"], id=venvconfig["id"])
         vivenv.exe = venvconfig["exe"]
 
         return vivenv
 
     def create(self) -> None:
-
         echo(f"new unique vivenv -> {self.name}")
         with Spinner("creating vivenv"):
             builder = venv.EnvBuilder(with_pip=True, clear=True)
@@ -391,7 +386,6 @@ class ViVenv:
                 f.write("[global]\ndisable-pip-version-check = true")
 
     def install_pkgs(self):
-
         cmd: List[str | Path] = [
             self.path / "bin" / "pip",
             "install",
@@ -406,12 +400,11 @@ class ViVenv:
         )
 
     def dump_info(self, write=False):
-
         # TODO: include associated files in 'info'
         # means it needs to be loaded first
         info = {
             "created": str(datetime.today()),
-            "build_id": self.build_id,
+            "id": self.id,
             "spec": self.spec,
             "exe": self.exe,
         }
@@ -424,13 +417,13 @@ class ViVenv:
             a.table((("key", "value"), *((k, v) for k, v in info.items())))
 
 
-def activate(*packages: str, track_exe: bool = False, name: str = "") -> None:
+def use(*packages: str, track_exe: bool = False, name: str = "") -> None:
     """create a vivenv and append to sys.path
 
     Args:
         packages: package specifications with optional version specifiers
         track_exe: if true make env python exe specific
-        name: use as vivenv name, if not provided build_id is used
+        name: use as vivenv name, if not provided id is used
     """
     validate_spec(packages)
     vivenv = ViVenv(list(packages), track_exe=track_exe, name=name)
@@ -458,7 +451,6 @@ def validate_spec(spec):
 
 
 def modify_sys_path(new_path: Path):
-
     # remove user-site
     for i, path in enumerate(sys.path):
         if path == site.USER_SITE:
@@ -478,8 +470,48 @@ def get_venvs():
 
 
 SYS_PATH_TEMPLATE = """__import__("sys").path.append("{path_to_viv}")  # noqa"""
-REL_SYS_PATH_TEMPLATE = """__import__("sys").path.append(__import__("os").path.expanduser("{path_to_viv}"))  # noqa"""
-IMPORT_TEMPLATE = """__import__("viv").activate({spec})  # noqa"""
+REL_SYS_PATH_TEMPLATE = (
+    """__import__("sys").path.append(__import__("os")"""
+    """.path.expanduser("{path_to_viv}"))  # noqa"""
+)
+IMPORT_TEMPLATE = """__import__("viv").use({spec})  # noqa"""
+
+STANDALONE_TEMPLATE = r"""
+# <<<<< auto-generated by daylinmorgan/viv (v.22.12a3)
+# fmt: off
+{use}
+# fmt: on
+# >>>>> code golfed with <3
+"""  # noqa
+
+STANDALONE_TEMPLATE_USE = r"""
+def _viv_use(*pkgs: str, track_exe: bool = False, name: str = "") -> None:
+    i,s,m,e,spec=__import__,str,map,lambda x: True if x else False,[*pkgs]
+    if not {{*m(type,pkgs)}}=={{s}}: raise ValueError(f"spec: {{pkgs}} is invalid")
+    ge,sys,P,ew=i("os").getenv,i("sys"),i("pathlib").Path,i("sys").stderr.write
+    (cache:=(P(ge("XDG_CACHE_HOME",P.home()/".cache"))/"viv"/"venvs")).mkdir(parents=True,exist_ok=True)
+    ((sha256:=i("hashlib").sha256()).update((s(spec)+
+     (((exe:=("N/A",s(P(i("sys").executable).resolve()))[e(track_exe)])))).encode()))
+    if (env:=cache/(name if name else (_id:=sha256.hexdigest()))) not in cache.glob("*/") or ge("VIV_FORCE"):
+        v=e(ge("VIV_VERBOSE"));ew(f"generating new vivenv -> {{env.name}}\n")
+        i("venv").EnvBuilder(with_pip=True,clear=True).create(env)
+        with (env/"pip.conf").open("w") as f:f.write("[global]\ndisable-pip-version-check=true")
+        if (p:=i("subprocess").run([env/"bin"/"pip","install","--force-reinstall",*spec],text=True,
+            stdout=(-1,None)[v],stderr=(-2,None)[v])).returncode!=0:
+            if env.is_dir():i("shutil").rmtree(env)
+            ew(f"pip had non zero exit ({{p.returncode}})\n{{p.stdout}}\n");sys.exit(p.returncode)
+        with (env/"viv-info.json").open("w") as f:
+            i("json").dump({{"created":s(i("datetime").datetime.today()),"id":_id,"spec":spec,"exe":exe}},f)
+    sys.path = [p for p in (*sys.path,s(*(env/"lib").glob("py*/si*"))) if p!=i("site").USER_SITE]
+_viv_use({spec})
+"""[  # noqa
+    1:
+]
+
+
+def noqa(txt: str) -> str:
+    max_length = max(map(len, txt.splitlines()))
+    return "\n".join((f"{line:{max_length}} # noqa" for line in txt.splitlines()))
 
 
 def spec_to_import(spec: List[str]) -> None:
@@ -508,7 +540,12 @@ def freeze_venv(spec: List[str], path: Path | None = None):
 
 
 def generate_import(
-    requirements: Path, reqs: List[str], vivenvs, include_path: bool, keep: bool
+    requirements: Path,
+    reqs: List[str],
+    vivenvs,
+    include_path: bool,
+    keep: bool,
+    standalone: bool,
 ) -> None:
     # TODO: make compatible with Venv class for now just use the name /tmp/
     reqs_from_file = []
@@ -523,13 +560,13 @@ def generate_import(
         echo("generating new vivenv")
         vivenv, resolved_spec = freeze_venv(reqs + reqs_from_file)
 
-        # update build_id and move vivenv
+        # update id and move vivenv
         vivenv.spec = resolved_spec.splitlines()
-        vivenv.build_id = get_hash(resolved_spec.splitlines())
-        echo(f"updated hash -> {vivenv.build_id}")
+        vivenv.id = get_hash(resolved_spec.splitlines())
+        echo(f"updated hash -> {vivenv.id}")
 
-        if not (c.venvcache / vivenv.build_id).exists():
-            vivenv.path = vivenv.path.rename(c.venvcache / vivenv.build_id)
+        if not (c.venvcache / vivenv.id).exists():
+            vivenv.path = vivenv.path.rename(c.venvcache / vivenv.id)
             vivenv.dump_info(write=True)
         else:
             echo("this vivenv already exists cleaning up temporary vivenv")
@@ -542,6 +579,21 @@ def generate_import(
             )
 
     echo("see below for import statements\n")
+
+    if standalone:
+        sys.stdout.write(
+            STANDALONE_TEMPLATE.format(
+                version=__version__,
+                use=noqa(
+                    STANDALONE_TEMPLATE_USE.format(
+                        spec=", ".join(f'"{pkg}"' for pkg in resolved_spec.splitlines())
+                    )
+                ),
+            )
+            + "\n"
+        )
+        return
+
     if include_path == "absolute":
         sys.stdout.write(
             SYS_PATH_TEMPLATE.format(
@@ -602,7 +654,6 @@ class CustomHelpFormatter(RawDescriptionHelpFormatter, HelpFormatter):
             return (", ").join(parts)
 
     def _format_usage(self, *args, **kwargs):
-
         formatted_usage = super()._format_usage(*args, **kwargs)
         # patch usage with color formatting
         formatted_usage = (
@@ -667,7 +718,6 @@ class CustomHelpFormatter(RawDescriptionHelpFormatter, HelpFormatter):
 
     def add_argument(self, action):
         if action.help is not SUPPRESS:
-
             # find all invocations
             get_invocation = self._format_action_invocation
             invocations = [get_invocation(action)]
@@ -706,7 +756,7 @@ description = f"""
 from command line:
   `{a.style("viv -h","bold")}`
 within python script:
-  {a.style('__import__("viv").activate("typer", "rich-click")','bold')}
+  {a.style('__import__("viv").use("typer", "rich-click")','bold')}
 """
 
 
@@ -720,7 +770,7 @@ class Viv:
         for k, v in self.vivenvs.items():
             if name_id == k or v.name == name_id:
                 matches.append(v)
-            elif k.startswith(name_id) or v.build_id.startswith(name_id):
+            elif k.startswith(name_id) or v.id.startswith(name_id):
                 matches.append(v)
             elif v.name.startswith(name_id):
                 matches.append(v)
@@ -755,11 +805,16 @@ class Viv:
         """create import statement from package spec"""
 
         if not args.reqs:
-            print("must specify a requirement")
+            error("must specify a requirement")
             sys.exit(1)
 
         generate_import(
-            args.requirements, args.reqs, self.vivenvs, args.path, args.keep
+            args.requirements,
+            args.reqs,
+            self.vivenvs,
+            args.path,
+            args.keep,
+            args.standalone,
         )
 
     def list(self, args):
@@ -791,7 +846,7 @@ class Viv:
 
         pip_path, python_path = (vivenv.path / "bin" / cmd for cmd in ("pip", "python"))
         # todo check for vivenv
-        print(f"executing command within {args.vivenv}")
+        echo(f"executing command within {args.vivenv}")
 
         cmd = (
             f"{pip_path} {' '.join(args.cmd)}"
@@ -912,6 +967,12 @@ class Viv:
             help="preserve environment",
             action="store_true",
         )
+        p_freeze.add_argument(
+            "-s",
+            "--standalone",
+            help="generate standalone activation function",
+            action="store_true",
+        )
         p_freeze.add_argument("reqs", help="requirements specifiers", nargs="*")
 
         self._get_subcmd_parser(

todo.md

@@ -1,7 +1,9 @@
 # VIV Todo's
 
-- [ ] swap flake8 for ruff
-- [ ] add classifiers for pypi?
-- [ ] use config file (probably ini or json / could also allow toml for python>=3.11)
+- [x] swap flake8 for ruff
+- [x] use stdout and stderr more effectively (or switch to logging?)
+- [ ] use config file (probably ini or toml for python>=3.11)
 - [ ] enable a garbage collection based on time or file existence (configurable)
-- [ ] unit tests
+- [ ] unit tests (v important)
+
+- [ ] add more options to filter `viv list`