fix: accept '--' positionals for viv exe

src/viv/viv.py

@@ -52,7 +52,7 @@ from typing import (
 from urllib.error import HTTPError
 from urllib.request import urlopen
 
-__version__ = "23.5a2-2-gebb657c-dev"
+__version__ = "23.5a2-5-g4e6acac-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")
@@ -559,7 +560,7 @@ 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
@@ -583,6 +584,18 @@ class ViVenv:
 
         return vivenv
 
+    def _validate_spec(self, spec: Tuple[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)
+        else:
+            return sorted(spec)
+
     def create(self, quiet: bool = False) -> None:
         if not quiet:
             echo(f"new unique vivenv -> {self.name}")
@@ -636,7 +649,6 @@ 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(
@@ -650,18 +662,6 @@ 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):
@@ -1025,7 +1025,7 @@ 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)
@@ -1240,6 +1240,42 @@ class Viv:
 
             make_executable(output)
 
+    def run(self, args: Namespace) -> None:
+        """\
+        run an app w/ 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)
+
+        default_bin = re.split(r"[=><~!*]+", args.reqs[0])[0]
+        bin = default_bin if not args.bin else args.bin
+        spec = combined_spec(args.reqs, args.requirements)
+        vivenv = ViVenv(spec)
+
+        if vivenv.name not in [d.name for d in c.venvcache.iterdir()] 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 +1445,10 @@ 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]
         )
-        ).set_defaults(func=self.shim, cmd="shim")
+
         p_shim.add_argument(
             "-f",
             "--freeze",
@@ -1427,11 +1462,41 @@ 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>"
+        )
 
+        p_run = self._get_subcmd_parser(subparsers, "run")
+
+        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)
+        args.func(
+            args,
+        )
 
 
 def main() -> None: