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docs: update README/example

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Daylin Morgan 2023-05-28 18:36:41 -05:00
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63
README.md
View file

@ -9,16 +9,9 @@
</p>
</div>
<br />
---
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).
@ -26,6 +19,10 @@ In any case they will be re-used across scripts (and generated on-demand, if nee
**Importantly**, `viv` will also remove your user site directory.
(view with: `python -m 'import site;print(site.USER_SITE)'`).
`Viv`'s uncompromising insistence on portability means that it will always (1) only use the standard library (2) never exceed a single script.
For that reason any usage of the `CLI` can be accomplished using a remote copy as seen in the below install command.
## Setup
Run the below command to install `viv`.
@ -46,6 +43,19 @@ the module just needs to be recognized at run time
and the single script [`viv.py`](https://github.com/daylinmorgan/viv/blob/main/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.
## Additional Features
An experimental feature of `viv` is generating shim's that leverage the principles of `viv`.
These shims would operate similar to `pipx` in which you can specify a command line app to "install".
*Note* that `--standalone` will auto-generate a code-golfed minified version of `viv` to accomplish the same basic task as using a local copy of `viv`.
After generating this a standalone `shim` you can freely use this script across unix machines which have `python>3.8`.
See [examples/black](https://github.com/daylinmorgan/viv/blob/dev/examples/black) for output of below command.
```sh
python3 <(curl -fsSL gh.dayl.in/viv/viv.py) shim black -o ./black --standalone --freeze
```
### Pypi (Not Recommended)
```sh
@ -70,43 +80,10 @@ To remove all `vivenvs` you can use the below command:
viv remove $(viv list -q)
```
# Standalone Viv
To remove `viv` all together you can use the included `purge` command:
Supposing you want to increase the portability of your script while still employing the principles of `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 (v22.12a3-35-g0d0c66d-dev)
# 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
```sh
python3 <(curl -fsSL gh.dayl.in/viv/viv.py) manage purge
```
## Alternatives

45
examples/black
View file

@ -1,20 +1,38 @@
#!/usr/bin/env python3
"""
Proof of concept output for a 'shim generator'
that would essentially emulate pipx
A possible cli signature
viv shim black -o ~/bin/black
"""
# <<<<< auto-generated by viv (v23.5a2-2-gebb657c-dev)
# see `python3 <(curl -fsSL gh.dayl.in/viv/viv.py) --help`
# fmt: off
def _viv_use(*pkgs, track_exe=False, name=""): # noqa
T,F=True,False;i,s,m,e,spec=__import__,str,map,lambda x: T if x else F,[*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=T,exist_ok=T) # 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()))) # noqa
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=T,clear=T).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()), # noqa
"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
return env # noqa
# fmt: on
# >>>>> code golfed with <3
import subprocess
import sys
import viv
if __name__ == "__main__":
vivenv = viv.use(
vivenv = _viv_use(
"black==23.3.0",
"click==8.1.3",
"mypy-extensions==1.0.0",
@ -22,11 +40,4 @@ if __name__ == "__main__":
"pathspec==0.11.1",
"platformdirs==3.5.1",
)
sys.exit(
subprocess.run(
[
vivenv.path / "bin" / "black",
*sys.argv[1:],
]
).returncode
)
sys.exit(subprocess.run([vivenv / "bin" / "black", *sys.argv[1:]]).returncode)