debug

.gitignore

@@ -111,7 +111,7 @@ ipython_config.py
 #   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
 #   in version control.
 #   https://pdm.fming.dev/#use-with-ide
-.pdm.toml
+.pdm-python
 
 # PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
 __pypackages__/

.pre-commit-config.yaml

@@ -1,25 +1,16 @@
 # See https://pre-commit.com for more information
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
-    hooks:
-      - id: trailing-whitespace
-      - id: end-of-file-fixer
-      - id: check-added-large-files
-  - repo: https://github.com/pycqa/isort
-    rev: 5.12.0
-    hooks:
-      - id: isort
   - repo: https://github.com/psf/black
-    rev: 23.1.0
+    rev: 23.3.0
     hooks:
       - id: black
         language_version: python
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: 'v0.0.245'
+    rev: 'v0.0.270'
     hooks:
       - id: ruff
+        args: [--fix, --exit-non-zero-on-fix, --show-fixes]
   - repo: local
     hooks:
       - id: set-version

README.md

@@ -91,9 +91,10 @@ 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`:
+Output of `viv freeze rich --standalone`:
+
 ```python
-# <<<<< auto-generated by daylinmorgan/viv (v.22.12a3)
+# <<<<< 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
@@ -116,6 +117,8 @@ def _viv_use(*pkgs: str, track_exe: bool = False, name: str = "") -> None:
 _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

examples/black

@@ -0,0 +1,33 @@
+#!/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
+"""
+
+import sys
+
+sys.path.append("/home/daylin/.viv/src")  # noqa
+import subprocess
+import viv
+
+if __name__ == "__main__":
+    vivenv = viv.use(
+        "black==23.3.0",
+        "click==8.1.3",
+        "mypy-extensions==1.0.0",
+        "packaging==23.1",
+        "pathspec==0.11.1",
+        "platformdirs==3.5.1",
+    )
+    sys.exit(
+        subprocess.run(
+            [
+                vivenv.path / "bin" / "black",
+                *sys.argv[1:],
+            ]
+        ).returncode
+    )

examples/standalone.py

@@ -5,7 +5,7 @@ With this function it's not necessary for
 `viv` to exist anywhere on the system.
 """
 
-# <<<<< auto-generated by daylinmorgan/viv (v.22.12a3)
+# <<<<< 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

pyproject.toml

@@ -34,4 +34,5 @@ ignore = ["E402"]
 [tool.mypy]
 warn_return_any = true
 check_untyped_defs = true
+disallow_untyped_defs = true
 warn_unused_configs = true

src/viv/viv.py

@@ -6,6 +6,8 @@
   __import__("viv").use("requests", "bs4")
 """
 
+from __future__ import annotations
+
 import hashlib
 import itertools
 import json
@@ -19,18 +21,37 @@ import sys
 import tempfile
 import threading
 import time
+from urllib.request import urlopen
+from urllib.error import HTTPError
 import venv
-from argparse import SUPPRESS
+from argparse import SUPPRESS, Action
 from argparse import ArgumentParser as StdArgParser
-from argparse import HelpFormatter, RawDescriptionHelpFormatter
+from argparse import (
+    HelpFormatter,
+    Namespace,
+    RawDescriptionHelpFormatter,
+    _SubParsersAction,
+)
 from dataclasses import dataclass
 from datetime import datetime
 from itertools import zip_longest
 from pathlib import Path
 from textwrap import dedent, wrap
-from typing import Dict, List, Tuple
+from types import TracebackType
+from typing import (
+    Any,
+    Dict,
+    List,
+    NoReturn,
+    Optional,
+    Sequence,
+    TextIO,
+    Tuple,
+    Type,
+    Generator,
+)
 
-__version__ = "22.12a3-35-g0d0c66d-dev"
+__version__ = "22.12a3-48-gf87aab9-dev"
 
 
 @dataclass
@@ -41,7 +62,7 @@ class Config:
         Path(os.getenv("XDG_CACHE_HOME", Path.home() / ".cache")) / "viv" / "venvs"
     )
 
-    def __post_init__(self):
+    def __post_init__(self) -> None:
         self.venvcache.mkdir(parents=True, exist_ok=True)
 
 
@@ -53,7 +74,7 @@ class Spinner:
     https://raw.githubusercontent.com/Tagar/stuff/master/spinner.py
     """
 
-    def __init__(self, message, delay=0.1):
+    def __init__(self, message: str, delay: float = 0.1) -> None:
         self.spinner = itertools.cycle([f"{c}  " for c in "⣾⣽⣻⢿⡿⣟⣯⣷"])
         self.delay = delay
         self.busy = False
@@ -62,40 +83,42 @@ class Spinner:
         # sys.stdout.write(message)
         echo(message + "  ", newline=False)
 
-    def write_next(self):
+    def write_next(self) -> None:
         with self._screen_lock:
             if not self.spinner_visible:
                 sys.stderr.write(next(self.spinner))
                 self.spinner_visible = True
                 sys.stderr.flush()
 
-    def remove_spinner(self, cleanup=False):
+    def remove_spinner(self, cleanup: bool = False) -> None:
         with self._screen_lock:
             if self.spinner_visible:
                 sys.stderr.write("\b\b\b")
-                # sys.stdout.write("\b")
                 self.spinner_visible = False
                 if cleanup:
                     sys.stderr.write("   ")  # overwrite spinner with blank
-                    # sys.stdout.write("\r")  # move to next line
-                    # move back then delete the line
                     sys.stderr.write("\r\033[K")
                 sys.stderr.flush()
 
-    def spinner_task(self):
+    def spinner_task(self) -> None:
         while self.busy:
             self.write_next()
             time.sleep(self.delay)
             self.remove_spinner()
 
-    def __enter__(self):
+    def __enter__(self) -> None:
         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
+    def __exit__(
+        self,
+        exc_type: Optional[Type[BaseException]],
+        exc_val: Optional[BaseException],
+        exc_traceback: Optional[TracebackType],
+    ) -> None:
         if sys.stderr.isatty():
             self.busy = False
             self.remove_spinner(cleanup=True)
@@ -133,7 +156,7 @@ class Ansi:
     option: str = yellow
     metavar: str = "\033[33m"  # normal yellow
 
-    def __post_init__(self):
+    def __post_init__(self) -> None:
         if os.getenv("NO_COLOR") or not sys.stderr.isatty():
             for attr in self.__dict__:
                 setattr(self, attr, "")
@@ -166,7 +189,7 @@ class Ansi:
         """
         return f"{getattr(self,style)}{txt}{getattr(self,'end')}"
 
-    def tagline(self):
+    def tagline(self) -> str:
         """generate the viv tagline!"""
 
         return " ".join(
@@ -176,70 +199,78 @@ class Ansi:
             )
         )
 
-    def subprocess(self, output):
+    def subprocess(self, output: str) -> None:
         """generate output for subprocess error
 
         Args:
             output: text output from subprocess, usually from p.stdout
         """
 
+        echo("subprocess output:")
         new_output = [f"{self.red}->{self.end} {line}" for line in output.splitlines()]
-
         sys.stdout.write("\n".join(new_output) + "\n")
 
-    def _get_column_size(self, sizes, row):
+    def _get_column_sizes(
-        for i, length in enumerate(len(cell) for cell in row):
+        self, rows: Tuple[Tuple[str, Sequence[str]], ...]
-            if length > sizes[i]:
+    ) -> List[int]:
-                sizes[i] = length
+        """convert list of rows to list of columns sizes
-        return sizes
 
-    def _make_row(self, row) -> str:
+        First convert rows into list of columns,
+        then get max string length for each column.
+        """
+        return list(max(map(len, lst)) for lst in map(list, zip(*rows)))  # type: ignore
+
+    def _make_row(self, row: Generator[Any, None, None]) -> 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]]:
+    def _sanitize_row(
+        self, sizes: List[int], row: Tuple[str, Sequence[str]]
+    ) -> Tuple[Tuple[str, Sequence[str]], ...]:
         if len(row[1]) > sizes[1]:
-            return zip_longest(
+            return tuple(
+                zip_longest(
                     (row[0],),
-                wrap(row[1], break_on_hyphens=False, width=sizes[1]),
+                    wrap(str(row[1]), break_on_hyphens=False, width=sizes[1]),
                     fillvalue="",
                 )
+            )
         else:
             return (row,)
 
-    def table(self, rows, header_style="cyan") -> None:
+    def table(
-        """generate a table with outline and styled header
+        self, rows: Tuple[Tuple[str, Sequence[str]], ...], header_style: str = "cyan"
+    ) -> None:
+        """generate a table with outline and styled header assumes two columns
 
         Args:
             rows: sequence of the rows, first item assumed to be header
             header_style: color/style for header row
         """
 
-        sizes = [0] * len(rows[0])
+        sizes = self._get_column_sizes(rows)
-        for row in rows:
-            sizes = self._get_column_size(sizes, row)
 
-        col1_limit = shutil.get_terminal_size().columns - 20
+        col2_limit = shutil.get_terminal_size().columns - 20
-        if col1_limit < 20:
+        if col2_limit < 20:
             error("increase screen size to view table", code=1)
+        elif sizes[1] > col2_limit:
+            sizes[1] = col2_limit
 
-        if sizes[1] > col1_limit:
+        header, rows = rows[0], rows[1:]
-            sizes[1] = col1_limit
-
         # this is maybe taking comprehensions too far....
-
         table_rows = (
             self._make_row(row)
             for row in (
                 # header row
                 (
                     self.__dict__[header_style] + f"{cell:<{sizes[i]}}" + self.end
-                    for i, cell in enumerate(rows[0])
+                    for i, cell in enumerate(header)
                 ),
+                # rest of the rows
                 *(
                     (f"{cell:<{sizes[i]}}" for i, cell in enumerate(row))
                     for row in (
                         newrow
-                        for row in rows[1:]
+                        for row in rows
                         for newrow in self._sanitize_row(sizes, row)
                     )
                 ),
@@ -254,19 +285,21 @@ class Ansi:
 a = Ansi()
 
 
-def error(msg, code: int = 0):
+def error(msg: str, code: int = 0) -> None:
     """output error message and if code provided exit"""
     echo(f"{a.red}error:{a.end} {msg}", style="red")
     if code:
         sys.exit(code)
 
 
-def warn(msg):
+def warn(msg: str) -> None:
     """output warning message to stdout"""
     echo(f"{a.yellow}warn:{a.end} {msg}", style="yellow")
 
 
-def echo(msg: str, style="magenta", newline=True, fd=sys.stderr) -> None:
+def echo(
+    msg: str, style: str = "magenta", newline: bool = True, fd: TextIO = sys.stderr
+) -> None:
     """output general message to stdout"""
     output = f"{a.cyan}Viv{a.end}{a.__dict__[style]}::{a.end} {msg}"
     if newline:
@@ -274,13 +307,23 @@ def echo(msg: str, style="magenta", newline=True, fd=sys.stderr) -> None:
     fd.write(output)
 
 
+def confirm(question: str) -> bool:
+    while True:
+        ans = input(question + a.style(" (Y)es/(n)o: ", "yellow")).strip().lower()
+        if ans in ("y", "yes"):
+            return True
+        elif ans in ("n", "no"):
+            return False
+        sys.stdout.write("\nPlease select (Y)es or (n)o.")
+
+
 def run(
-    command: List[str | Path],
+    command: List[str],
     spinmsg: str = "",
-    clean_up_path: Path | None = None,
+    clean_up_path: Optional[Path] = None,
     verbose: bool = False,
     ignore_error: bool = False,
-    check_output=False,
+    check_output: bool = False,
 ) -> str:
     """run a subcommand
 
@@ -385,9 +428,9 @@ class ViVenv:
             with (self.path / "pip.conf").open("w") as f:
                 f.write("[global]\ndisable-pip-version-check = true")
 
-    def install_pkgs(self):
+    def install_pkgs(self) -> None:
-        cmd: List[str | Path] = [
+        cmd: List[str] = [
-            self.path / "bin" / "pip",
+            str(self.path / "bin" / "pip"),
             "install",
             "--force-reinstall",
         ] + self.spec
@@ -399,7 +442,7 @@ class ViVenv:
             verbose=bool(os.getenv("VIV_VERBOSE")),
         )
 
-    def dump_info(self, write=False):
+    def dump_info(self, write: bool = False) -> None:
         # TODO: include associated files in 'info'
         # means it needs to be loaded first
         info = {
@@ -417,7 +460,7 @@ class ViVenv:
             a.table((("key", "value"), *((k, v) for k, v in info.items())))
 
 
-def use(*packages: str, track_exe: bool = False, name: str = "") -> None:
+def use(*packages: str, track_exe: bool = False, name: str = "") -> ViVenv:
     """create a vivenv and append to sys.path
 
     Args:
@@ -436,9 +479,10 @@ def use(*packages: str, track_exe: bool = False, name: str = "") -> None:
         vivenv.dump_info(write=True)
 
     modify_sys_path(vivenv.path)
+    return vivenv
 
 
-def validate_spec(spec):
+def validate_spec(spec: Tuple[str, ...]) -> None:
     """ensure spec is at least of sequence of strings
 
     Args:
@@ -450,7 +494,7 @@ def validate_spec(spec):
         error(f"check your packages definitions: {spec}", code=1)
 
 
-def modify_sys_path(new_path: Path):
+def modify_sys_path(new_path: Path) -> None:
     # remove user-site
     for i, path in enumerate(sys.path):
         if path == site.USER_SITE:
@@ -461,7 +505,7 @@ def modify_sys_path(new_path: Path):
     )
 
 
-def get_venvs():
+def get_venvs() -> Dict[str, ViVenv]:
     vivenvs = {}
     for p in c.venvcache.iterdir():
         vivenv = ViVenv.load(p.name)
@@ -477,7 +521,7 @@ REL_SYS_PATH_TEMPLATE = (
 IMPORT_TEMPLATE = """__import__("viv").use({spec})  # noqa"""
 
 STANDALONE_TEMPLATE = r"""
-# <<<<< auto-generated by daylinmorgan/viv (v.22.12a3)
+# <<<<< auto-generated by daylinmorgan/viv v{version}
 # fmt: off
 {use}
 # fmt: on
@@ -508,6 +552,12 @@ _viv_use({spec})
     1:
 ]
 
+SHOW_TEMPLATE = f"""\
+  {a.style('Version', 'bold')}: {{version}}
+  {a.style('CLI', 'bold')}: {{cli}}
+  {a.style('Source File', 'bold')}: {{src}}
+"""
+
 
 def noqa(txt: str) -> str:
     max_length = max(map(len, txt.splitlines()))
@@ -519,14 +569,14 @@ def spec_to_import(spec: List[str]) -> None:
     sys.stdout.write(IMPORT_TEMPLATE.format(spec=spec_str) + "\n")
 
 
-def freeze_venv(spec: List[str], path: Path | None = None):
+def freeze_venv(spec: List[str], path: Path | None = None) -> Tuple[ViVenv, str]:
     vivenv = ViVenv(spec, track_exe=False, path=path)
 
     vivenv.create()
     # populate the environment for now use
     # custom cmd since using requirements file
     cmd = [
-        vivenv.path / "bin" / "pip",
+        str(vivenv.path / "bin" / "pip"),
         "install",
         "--force-reinstall",
     ] + spec
@@ -534,7 +584,7 @@ def freeze_venv(spec: List[str], path: Path | None = None):
     run(cmd, spinmsg="resolving dependencies", clean_up_path=vivenv.path)
 
     # generate a frozen environment
-    cmd = [vivenv.path / "bin" / "pip", "freeze"]
+    cmd = [str(vivenv.path / "bin" / "pip"), "freeze"]
     resolved_spec = run(cmd, check_output=True)
     return vivenv, resolved_spec
 
@@ -542,41 +592,34 @@ def freeze_venv(spec: List[str], path: Path | None = None):
 def generate_import(
     requirements: Path,
     reqs: List[str],
-    vivenvs,
+    vivenvs: Dict[str, ViVenv],
     include_path: bool,
     keep: bool,
     standalone: bool,
 ) -> None:
-    # TODO: make compatible with Venv class for now just use the name /tmp/
     reqs_from_file = []
 
     if requirements:
         with requirements.open("r") as f:
             reqs_from_file = f.readlines()
 
-    # refactor to make the below steps context dependent with tmpdir path
+    with tempfile.TemporaryDirectory() as tmpdir:
+        echo("generating frozen spec")
+        vivenv, resolved_spec = freeze_venv(reqs + reqs_from_file, path=Path(tmpdir))
+
     if keep:
-        # TODO: remove directory if any errors occur?
+        # create env again since path's are hard-coded
-        echo("generating new vivenv")
+        vivenv = ViVenv(resolved_spec.splitlines())
-        vivenv, resolved_spec = freeze_venv(reqs + reqs_from_file)
 
-        # update id and move vivenv
+        if vivenv.name not in [d.name for d in c.venvcache.iterdir()] or os.getenv(
-        vivenv.spec = resolved_spec.splitlines()
+            "VIV_FORCE"
-        vivenv.id = get_hash(resolved_spec.splitlines())
+        ):
-        echo(f"updated hash -> {vivenv.id}")
+            vivenv.create()
-
+            vivenv.install_pkgs()
-        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")
+            echo("re-using existing vivenv")
-            shutil.rmtree(vivenv.path)
-    else:
-        with tempfile.TemporaryDirectory() as tmpdir:  #
-            echo("generating temporary vivenv ")
-            vivenv, resolved_spec = freeze_venv(
-                reqs + reqs_from_file, path=Path(tmpdir)
-            )
 
     echo("see below for import statements\n")
 
@@ -617,10 +660,10 @@ def generate_import(
 class CustomHelpFormatter(RawDescriptionHelpFormatter, HelpFormatter):
     """formatter to remove extra metavar on short opts"""
 
-    def _get_invocation_length(self, invocation):
+    def _get_invocation_length(self, invocation: str) -> int:
         return len(a.escape(invocation))
 
-    def _format_action_invocation(self, action):
+    def _format_action_invocation(self, action: Action) -> str:
         if not action.option_strings:
             (metavar,) = self._metavar_formatter(action, action.dest)(1)
             return a.style(metavar, style="option")
@@ -653,7 +696,7 @@ class CustomHelpFormatter(RawDescriptionHelpFormatter, HelpFormatter):
                 parts[-1] += a.style(f" {args_string}", style="metavar")
             return (", ").join(parts)
 
-    def _format_usage(self, *args, **kwargs):
+    def _format_usage(self, *args: Any, **kwargs: Any) -> str:
         formatted_usage = super()._format_usage(*args, **kwargs)
         # patch usage with color formatting
         formatted_usage = (
@@ -663,7 +706,7 @@ class CustomHelpFormatter(RawDescriptionHelpFormatter, HelpFormatter):
         )
         return formatted_usage
 
-    def _format_action(self, action):
+    def _format_action(self, action: Action) -> str:
         # determine the required width and the entry label
         help_position = min(self._action_max_length + 2, self._max_help_position)
         help_width = max(self._width - help_position, 11)
@@ -673,11 +716,10 @@ class CustomHelpFormatter(RawDescriptionHelpFormatter, HelpFormatter):
 
         # no help; start on same line and add a final newline
         if not action.help:
-            tup = self._current_indent, "", action_header
+            action_header = "%*s%s\n" % (self._current_indent, "", action_header)
-            action_header = "%*s%s\n" % tup
         # short action name; start on the same line and pad two spaces
         elif action_header_len <= action_width:
-            tup = self._current_indent, "", action_width, action_header
+            # tup = self._current_indent, "", action_width, action_header
             action_header = (
                 f"{' '*self._current_indent}{action_header}"
                 f"{' '*(action_width+2 - action_header_len)}"
@@ -686,8 +728,7 @@ class CustomHelpFormatter(RawDescriptionHelpFormatter, HelpFormatter):
 
         # long action name; start on the next line
         else:
-            tup = self._current_indent, "", action_header
+            action_header = "%*s%s\n" % (self._current_indent, "", action_header)
-            action_header = "%*s%s\n" % tup
             indent_first = help_position
 
         # collect the pieces of the action help
@@ -713,10 +754,13 @@ class CustomHelpFormatter(RawDescriptionHelpFormatter, HelpFormatter):
         # return a single string
         return self._join_parts(parts)
 
-    def start_section(self, heading: str) -> None:
+    def start_section(self, heading: Optional[str]) -> None:
-        return super().start_section(a.style(heading, style="header"))
+        if heading:
+            super().start_section(a.style(heading, style="header"))
+        else:
+            super()
 
-    def add_argument(self, action):
+    def add_argument(self, action: Action) -> None:
         if action.help is not SUPPRESS:
             # find all invocations
             get_invocation = self._format_action_invocation
@@ -734,14 +778,14 @@ class CustomHelpFormatter(RawDescriptionHelpFormatter, HelpFormatter):
 
 
 class ArgumentParser(StdArgParser):
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
         super().__init__(*args, **kwargs)
 
         self.formatter_class = lambda prog: CustomHelpFormatter(
             prog, max_help_position=35
         )
 
-    def error(self, message):
+    def error(self, message: str) -> NoReturn:
         error(message)
         echo("see below for help\n", style="red")
         self.print_help()
@@ -761,12 +805,12 @@ within python script:
 
 
 class Viv:
-    def __init__(self):
+    def __init__(self) -> None:
         self.vivenvs = get_venvs()
 
-    def _match_vivenv(self, name_id: str) -> ViVenv:
+    def _match_vivenv(self, name_id: str) -> ViVenv:  # type: ignore[return]
         # TODO: improve matching algorithm to favor names over id's
-        matches = []
+        matches: List[ViVenv] = []
         for k, v in self.vivenvs.items():
             if name_id == k or v.name == name_id:
                 matches.append(v)
@@ -774,15 +818,16 @@ class Viv:
                 matches.append(v)
             elif v.name.startswith(name_id):
                 matches.append(v)
-        if not matches:
+
-            error(f"no matches found for {name_id}", code=1)
+        if len(matches) == 1:
+            return matches[0]
         elif len(matches) > 1:
             echo(f"matches {','.join((match.name for match in matches))}", style="red")
             error("too many matches maybe try a longer name?", code=1)
         else:
-            return matches[0]
+            error(f"no matches found for {name_id}", code=1)
 
-    def remove(self, args):
+    def remove(self, args: Namespace) -> None:
         """\
         remove a vivenv
 
@@ -801,7 +846,7 @@ class Viv:
                     code=1,
                 )
 
-    def freeze(self, args):
+    def freeze(self, args: Namespace) -> None:
         """create import statement from package spec"""
 
         if not args.reqs:
@@ -817,7 +862,7 @@ class Viv:
             args.standalone,
         )
 
-    def list(self, args):
+    def list(self, args: Namespace) -> None:
         """list all vivenvs"""
 
         if args.quiet:
@@ -839,14 +884,14 @@ class Viv:
             )
             a.table(rows)
 
-    def exe(self, args):
+    def exe(self, args: Namespace) -> None:
         """run python/pip in vivenv"""
 
         vivenv = self._match_vivenv(args.vivenv)
 
         pip_path, python_path = (vivenv.path / "bin" / cmd for cmd in ("pip", "python"))
         # todo check for vivenv
-        echo(f"executing command within {args.vivenv}")
+        echo(f"executing command within {vivenv.name}")
 
         cmd = (
             f"{pip_path} {' '.join(args.cmd)}"
@@ -857,7 +902,7 @@ class Viv:
         echo(f"executing {cmd}")
         run(shlex.split(cmd), verbose=True)
 
-    def info(self, args):
+    def info(self, args: Namespace) -> None:
         """get metadata about a vivenv"""
         vivenv = self._match_vivenv(args.vivenv)
         metadata_file = vivenv.path / "viv-info.json"
@@ -869,10 +914,84 @@ class Viv:
 
         vivenv.dump_info()
 
-    def _get_subcmd_parser(self, subparsers, name: str, **kwargs) -> ArgumentParser:
+    def manage(self, args: Namespace) -> None:
+        """manage viv installation"""
+
+        if args.cmd == "show":
+            # NOTE: could reuse the table output for this?
+            echo("Installation Info:")
+            sys.stdout.write(
+                SHOW_TEMPLATE.format(
+                    version=__version__,
+                    cli=shutil.which("viv"),
+                    src=Path(__file__).resolve(),
+                )
+            )
+
+        elif args.cmd == "update":
+            echo(__file__)
+            echo(Path(__file__))
+            if str(Path(__file__).resolve()).startswith("/proc/"):
+                error(
+                    a.style("viv manage update", "bold")
+                    + "should be used with a locally installed viv",
+                    1,
+                )
+            try:
+                r = urlopen(
+                    "https://raw.githubusercontent.com/daylinmorgan/viv/"
+                    + args.reference
+                    + "/src/viv/viv.py"
+                )
+            except HTTPError as e:
+                error(
+                    "Issue updating viv see below:"
+                    + a.style("->  ", "red").join(["\n"] + repr(e).splitlines())
+                )
+                if "404" in repr(e):
+                    echo("Please check your reference is valid.", style="red")
+                sys.exit(1)
+
+            viv_src = r.read()
+
+            (hash := hashlib.sha256()).update(viv_src)
+            sha256 = hash.hexdigest()
+
+            (
+                src_cache := Path(os.getenv("XDG_CACHE_HOME", Path.home() / ".cache"))
+                / "viv"
+                / "src"
+            ).mkdir(exist_ok=True, parents=True)
+            cached_version = src_cache / f"{sha256}.py"
+
+            if not cached_version.is_file():
+                with cached_version.open("w") as f:
+                    f.write(viv_src.decode())
+
+            sys.path.append(str(src_cache))
+            next_version = __import__(sha256).__version__
+            q = (
+                "Update source at: "
+                + a.style(Path(__file__).resolve(), "bold")
+                + f" \n from version {__version__} to {next_version}?"
+            )
+
+            if confirm(q):
+                print("AWAY THEN")
+
+        elif args.cmd == "install":
+            echo("not yet implemented. sorry")
+
+    def _get_subcmd_parser(
+        self,
+        subparsers: _SubParsersAction[ArgumentParser],
+        name: str,
+        attr: Optional[str] = None,
+        **kwargs: Any,
+    ) -> ArgumentParser:
         aliases = kwargs.pop("aliases", [name[0]])
-        cmd = getattr(self, name)
+        cmd = getattr(self, attr if attr else name)
-        parser = subparsers.add_parser(
+        parser: ArgumentParser = subparsers.add_parser(
             name,
             help=cmd.__doc__.splitlines()[0],
             description=dedent(cmd.__doc__),
@@ -883,7 +1002,7 @@ class Viv:
 
         return parser
 
-    def cli(self):
+    def cli(self) -> None:
         """cli entrypoint"""
 
         parser = ArgumentParser(description=description)
@@ -927,16 +1046,15 @@ class Viv:
             nargs="*",
         )
 
-        p_exe_python = p_exe_sub.add_parser(
+        p_exe_sub.add_parser(
             "python",
             help="run command with python",
             parents=[p_vivenv_arg, p_exe_shared],
-        )
+        ).set_defaults(func=self.exe, exe="python")
-        p_exe_pip = p_exe_sub.add_parser(
+
+        p_exe_sub.add_parser(
             "pip", help="run command with pip", parents=[p_vivenv_arg, p_exe_shared]
-        )
+        ).set_defaults(func=self.exe, exe="pip")
-        p_exe_python.set_defaults(func=self.exe, exe="python")
-        p_exe_pip.set_defaults(func=self.exe, exe="pip")
 
         p_remove = self._get_subcmd_parser(
             subparsers,
@@ -981,12 +1099,39 @@ class Viv:
             parents=[p_vivenv_arg],
         )
 
+        p_manage_sub = self._get_subcmd_parser(
+            subparsers, name="manage"
+        ).add_subparsers(title="subcommand", metavar="<sub-cmd>", required=True)
+
+        p_manage_sub.add_parser(
+            "install",
+            help="install viv",
+        ).set_defaults(func=self.manage, cmd="install")
+
+        (
+            p_manage_update := p_manage_sub.add_parser(
+                "update",
+                help="update viv version",
+            )
+        ).set_defaults(func=self.manage, cmd="update")
+
+        p_manage_update.add_argument(
+            "-r",
+            "--reference",
+            help="git reference (branch/tag/commit)",
+            default="main",
+        )
+
+        p_manage_sub.add_parser(
+            "show", help="show current installation info"
+        ).set_defaults(func=self.manage, cmd="show")
+
         args = parser.parse_args()
 
         args.func(args)
 
 
-def main():
+def main() -> None:
     viv = Viv()
     viv.cli()
 

todo.md

@@ -5,5 +5,6 @@
 - [ ] use config file (probably ini or toml for python>=3.11)
 - [ ] enable a garbage collection based on time or file existence (configurable)
 - [ ] unit tests (v important)
+- [ ] update command
 
 - [ ] add more options to filter `viv list`