docs: update some of the docstrings

.github/workflows/docs.yml

@@ -20,7 +20,6 @@ jobs:
 
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
-        if: ${{ github.ref == 'refs/heads/main' }}
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           # publish_dir: ./site

.task.cfg.mk

@@ -1,4 +1,4 @@
-USAGE={a.bold}{a.cyan} viv isn't venv{a.end}\n\n\ttasks:\n
+USAGE={a.bold}{a.cyan} viv tasks{a.end}:\n
 PHONIFY=1
 HELP_SEP={a.b_blue}>>>{a.end}
 

Makefile

@@ -7,7 +7,7 @@ lint: ## run pre-commit hooks
 types: ## run mypy
 	mypy src/viv
 
-bump-version: ## update version and tag commit
+bump: ## update version and tag commit
 	@echo "bumping to version => $(VERSION)"
 	@sed -i 's/__version__ = ".*"/__version__ = "$(VERSION)"/g' src/viv/viv.py
 	@git add src/viv/viv.py && git commit -m "chore: bump version" --no-verify
@@ -15,18 +15,9 @@ bump-version: ## update version and tag commit
 	@git tag -d latest || true
 	@git tag latest
 
-
 venv: ## generate environment
 	pdm install
 
-# 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)
-# 	cd docs; vhs < $*.tape
-
 clean: ## remove build artifacts
 	rm -rf {build,dist}
 

README.md

@@ -9,6 +9,10 @@
   </p>
 </div>
 
+Try before you buy!
+```sh
+python3 <(curl -fsSL gh.dayl.in/viv/viv.py) run pycowsay -- "Viv isn't venv\!"
+```
 ---
 
 `Viv` is a standalone dependency-free `venv` creator.

assets/logo.svg

@@ -296,7 +296,7 @@
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        style="fill:url(#linearGradient2675);stroke-width:0.710589" /><g
        id="g2303"
-       transform="matrix(1.0141096,0,0,1.0141096,120.25928,195.81719)"><path
+       transform="matrix(0.95699137,0,0,0.95699137,118.57865,202.02858)"><path
          id="path1948"
          style="fill:url(#linearGradient1478);fill-opacity:1"
          d="m 60.510156,6.3979729 c -4.583653,0.021298 -8.960939,0.4122177 -12.8125,1.09375 C 36.35144,9.4962267 34.291407,13.691825 34.291406,21.429223 v 10.21875 h 26.8125 v 3.40625 h -26.8125 -10.0625 c -7.792459,0 -14.6157592,4.683717 -16.7500002,13.59375 -2.46182,10.212966 -2.5710151,16.586023 0,27.25 1.9059283,7.937852 6.4575432,13.593748 14.2500002,13.59375 h 9.21875 v -12.25 c 0,-8.849902 7.657144,-16.656248 16.75,-16.65625 h 26.78125 c 7.454951,0 13.406253,-6.138164 13.40625,-13.625 v -25.53125 c 0,-7.266339 -6.12998,-12.7247775 -13.40625,-13.9375001 -4.605987,-0.7667253 -9.385097,-1.1150483 -13.96875,-1.09375 z m -14.5,8.2187501 c 2.769547,0 5.03125,2.298646 5.03125,5.125 -2e-6,2.816336 -2.261703,5.09375 -5.03125,5.09375 -2.779476,-1e-6 -5.03125,-2.277415 -5.03125,-5.09375 -1e-6,-2.826353 2.251774,-5.125 5.03125,-5.125 z" /><path
@@ -306,7 +306,7 @@
          id="path1894"
          style="opacity:0.44382;fill:url(#radialGradient1480);fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:20;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
          transform="matrix(0.73406,0,0,0.809524,16.24958,27.00935)"
-         d="m 110.46717,132.28575 a 48.948285,8.6066792 0 1 1 -97.896571,0 48.948285,8.6066792 0 1 1 97.896571,0 z" /></g><path
+         d="m 110.46717,132.28575 a 48.948285,8.6066809 0 1 1 -97.896571,0 48.948285,8.6066809 0 1 1 97.896571,0 z" /></g><path
        id="rect7393"
        style="fill:url(#linearGradient2672);stroke-width:0.710589"
        d="m 115.10481,165.35798 c -2.95605,0 -4.89596,1.63364 -5.74867,2.88997 l -13.749902,21.88686 c -0.753225,1.30748 -0.09238,2.24546 1.129837,2.24546 l 170.733305,0.24871 c 2.26678,-0.17765 3.29003,-0.86692 0.0426,-3.33977 l -24.7285,-20.29159 c -1.7978,-1.80135 -4.60462,-3.63964 -8.10783,-3.63964 z" /><path

src/viv/viv.py

@@ -52,7 +52,7 @@ from typing import (
 from urllib.error import HTTPError
 from urllib.request import urlopen
 
-__version__ = "23.5a3"
+__version__ = "23.5a4-4-g158acbc-dev"
 
 
 class Config:
@@ -226,7 +226,8 @@ class Ansi:
         Args:
             output: text output from subprocess, usually from p.stdout
         """
-
+        if not output:
+            return
         echo("subprocess output:")
         new_output = [f"{self.red}->{self.end} {line}" for line in output.splitlines()]
         sys.stdout.write("\n".join(new_output) + "\n")
@@ -559,11 +560,12 @@ class ViVenv:
         name: str = "",
         path: Path | None = None,
     ) -> None:
-        self.spec = spec
+        self.spec = self._validate_spec(spec)
         self.exe = str(Path(sys.executable).resolve()) if track_exe else "N/A"
         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
+        self.exists = self.name in [d.name for d in c.venvcache.iterdir()]
 
     @classmethod
     def load(cls, name: str) -> "ViVenv":
@@ -583,6 +585,18 @@ class ViVenv:
 
         return vivenv
 
+    def _validate_spec(self, spec: List[str]) -> List[str]:
+        """ensure spec is at least of sequence of strings
+
+        Args:
+            spec: sequence of package specifications
+        """
+        if not set(map(type, spec)) == {str}:
+            error("unexepected input in package spec")
+            error(f"check your packages definitions: {spec}", code=1)
+
+        return sorted(spec)
+
     def create(self, quiet: bool = False) -> None:
         if not quiet:
             echo(f"new unique vivenv -> {self.name}")
@@ -636,12 +650,9 @@ def use(*packages: str, track_exe: bool = False, name: str = "") -> Path:
         track_exe: if true make env python exe specific
         name: use as vivenv name, if not provided id is used
     """
-    validate_spec(packages)
     vivenv = ViVenv(list(packages), track_exe=track_exe, name=name)
 
-    if vivenv.name not in [d.name for d in c.venvcache.iterdir()] or os.getenv(
+    if not vivenv.exists or os.getenv("VIV_FORCE"):
-        "VIV_FORCE"
-    ):
         vivenv.create()
         vivenv.install_pkgs()
         vivenv.dump_info(write=True)
@@ -650,18 +661,6 @@ def use(*packages: str, track_exe: bool = False, name: str = "") -> Path:
     return vivenv.path
 
 
-def validate_spec(spec: Tuple[str, ...]) -> None:
-    """ensure spec is at least of sequence of strings
-
-    Args:
-        spec: sequence of package specifications
-    """
-    # ? make this a part of ViVenv?
-    if not set(map(type, spec)) == {str}:
-        error("unexepected input in package spec")
-        error(f"check your packages definitions: {spec}", code=1)
-
-
 def modify_sys_path(new_path: Path) -> None:
     # remove user-site
     for i, path in enumerate(sys.path):
@@ -939,12 +938,11 @@ class Viv:
             )
 
     def _match_vivenv(self, name_id: str) -> ViVenv:  # type: ignore[return]
-        # TODO: improve matching algorithm to favor names over id's
         matches: List[ViVenv] = []
         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.id.startswith(name_id):
+            elif k.startswith(name_id) or (v.id.startswith(name_id) and v.id == v.name):
                 matches.append(v)
             elif v.name.startswith(name_id):
                 matches.append(v)
@@ -1013,7 +1011,7 @@ class Viv:
             a.table(rows)
 
     def exe(self, args: Namespace) -> None:
-        """run python/pip in vivenv"""
+        """run python/pip in existing vivenv"""
 
         vivenv = self._match_vivenv(args.vivenv)
 
@@ -1025,7 +1023,7 @@ class Viv:
             f"{pip_path} {' '.join(args.cmd)}"
             if args.exe == "pip"
             else f"{python_path} {' '.join(args.cmd)}"
-        )
+        ) + " ".join(args.rest)
 
         echo(f"executing {cmd}")
         run(shlex.split(cmd), verbose=True)
@@ -1048,16 +1046,19 @@ class Viv:
         make_executable(src)
         echo("symlinking cli")
 
-        if not cli.is_file():
+        if cli.is_file() and confirm(
+            f"Existing file at {a.style(str(cli),'bold')}, "
+            "would you like to overwrite it?"
+        ):
+            cli.unlink()
             cli.symlink_to(src)
         else:
-            cli.unlink()
             cli.symlink_to(src)
 
         echo("Remember to include the following line in your shell rc file:")
         sys.stderr.write(
             '  export PYTHONPATH="$PYTHONPATH:$HOME/'
-            f'{src.relative_to(Path.home())}"\n'
+            f'{src.relative_to(Path.home()).parent}"\n'
         )
 
     def manage(self, args: Namespace) -> None:
@@ -1179,6 +1180,10 @@ class Viv:
                     "`python3 <(curl -fsSL gh.dayl.in/viv/viv.py) manage install`"
                 )
 
+    def _pick_bin(self, args: Namespace) -> Tuple[str, str]:
+        default = re.split(r"[=><~!*]+", args.reqs[0])[0]
+        return default, (default if not args.bin else args.bin)
+
     def shim(self, args: Namespace) -> None:
         """\
         generate viv-powered cli apps
@@ -1192,8 +1197,7 @@ class Viv:
         if not args.reqs:
             error("please specify at lease one dependency", code=1)
 
-        default_bin = re.split(r"[=><~!*]+", args.reqs[0])[0]
+        default_bin, bin = self._pick_bin(args)
-        bin = default_bin if not args.bin else args.bin
         output = (
             c.binparent / default_bin if not args.output else args.output.absolute()
         )
@@ -1240,6 +1244,43 @@ class Viv:
 
             make_executable(output)
 
+    def run(self, args: Namespace) -> None:
+        """\
+        run an app with an on-demand venv
+
+        examples:
+          viv r pycowsay -- "Viv isn't venv\!"
+          viv r rich -b python -- -m rich
+        """
+        if not args.reqs:
+            error("please specify at lease one dependency", code=1)
+
+        _, bin = self._pick_bin(args)
+        spec = combined_spec(args.reqs, args.requirements)
+        vivenv = ViVenv(spec)
+
+        # TODO: respect a VIV_RUN_MODE env variable as the same as keep i.e.
+        # ephemeral (default), semi-ephemeral (persist inside /tmp), or
+        # persist (use c.cache)
+
+        if not vivenv.exists or os.getenv("VIV_FORCE"):
+            if not args.keep:
+                with tempfile.TemporaryDirectory(prefix="viv-") as tmpdir:
+                    vivenv.path = Path(tmpdir)
+                    vivenv.create()
+                    vivenv.install_pkgs()
+                    sys.exit(
+                        subprocess.run(
+                            [vivenv.path / "bin" / bin, *args.rest]
+                        ).returncode
+                    )
+            else:
+                vivenv.create()
+                vivenv.install_pkgs()
+                vivenv.dump_info(write=True)
+
+        sys.exit(subprocess.run([vivenv.path / "bin" / bin, *args.rest]).returncode)
+
     def _get_subcmd_parser(
         self,
         subparsers: _SubParsersAction[ArgumentParser],
@@ -1409,11 +1450,10 @@ class Viv:
             "purge", help="remove traces of viv", aliases="p", parents=[p_manage_shared]
         ).set_defaults(func=self.manage, cmd="purge")
 
-        (
+        p_shim = self._get_subcmd_parser(
-            p_shim := self._get_subcmd_parser(
+            subparsers, "shim", parents=[p_freeze_shim_shared]
-                subparsers, "shim", parents=[p_freeze_shim_shared]
+        )
-            )
+
-        ).set_defaults(func=self.shim, cmd="shim")
         p_shim.add_argument(
             "-f",
             "--freeze",
@@ -1427,11 +1467,41 @@ class Viv:
             type=Path,
             metavar="<path>",
         )
-        p_shim.add_argument("-b", "--bin", help="console_script/script to invoke")
+        p_shim.add_argument(
+            "-b", "--bin", help="console_script/script to invoke", metavar="<bin>"
+        )
 
-        args = parser.parse_args()
+        p_run = self._get_subcmd_parser(subparsers, "run")
 
-        args.func(args)
+        p_run.add_argument(
+            "-r",
+            "--requirements",
+            help="path/to/requirements.txt file",
+            metavar="<path>",
+        )
+        p_run.add_argument(
+            "-k",
+            "--keep",
+            help="preserve environment",
+            action="store_true",
+        )
+        p_run.add_argument("reqs", help="requirements specifiers", nargs="*")
+
+        p_run.add_argument(
+            "-b", "--bin", help="console_script/script to invoke", metavar="<bin>"
+        )
+
+        if "--" in sys.argv:
+            i = sys.argv.index("--")
+            args = parser.parse_args(sys.argv[1:i])
+            args.rest = sys.argv[i + 1 :]
+        else:
+            args = parser.parse_args()
+            args.rest = []
+
+        args.func(
+            args,
+        )
 
 
 def main() -> None: