allow version to be a path (#95)

* resolves #94

clang_tools/install.py

@@ -4,38 +4,35 @@
 
 The module that performs the installation of clang-tools.
 """
+
 import os
 from pathlib import Path, PurePath
 import re
 import shutil
 import subprocess
 import sys
-from typing import Optional
-from . import release_tag
+from typing import Optional, cast
 
-from . import install_os, RESET_COLOR, suffix, YELLOW
-from .util import download_file, verify_sha512, get_sha_checksum
+from . import release_tag, install_os, RESET_COLOR, suffix, YELLOW
+from .util import download_file, verify_sha512, get_sha_checksum, Version
 
 
 #: This pattern is designed to match only the major version number.
 RE_PARSE_VERSION = re.compile(rb"version\s([\d\.]+)", re.MULTILINE)
 
 
-def is_installed(tool_name: str, version: str) -> Optional[Path]:
+def is_installed(tool_name: str, version: Version) -> Optional[Path]:
     """Detect if the specified tool is installed.
 
     :param tool_name: The name of the specified tool.
-    :param version: The specific version to expect.
+    :param version: The specific major version to expect.
 
     :returns: The path to the detected tool (if found), otherwise `None`.
     """
-    version_tuple = version.split(".")
-    ver_major = version_tuple[0]
-    if len(version_tuple) < 3:
-        # append minor and patch version numbers if not specified
-        version_tuple += ("0",) * (3 - len(version_tuple))
     exe_name = (
-        f"{tool_name}" + (f"-{ver_major}" if install_os != "windows" else "") + suffix
+        f"{tool_name}"
+        + (f"-{version.info[0]}" if install_os != "windows" else "")
+        + suffix
     )
     try:
         result = subprocess.run(
@@ -47,19 +44,21 @@ def is_installed(tool_name: str, version: str) -> Optional[Path]:
     except (FileNotFoundError, subprocess.CalledProcessError):
         return None  # tool is not installed
     ver_num = RE_PARSE_VERSION.search(result.stdout)
+    assert ver_num is not None, "Failed to parse version from tool output"
+    ver_match = cast(bytes, ver_num.groups(0)[0]).decode(encoding="utf-8")
     print(
         f"Found a installed version of {tool_name}:",
-        ver_num.groups(0)[0].decode(encoding="utf-8"),
+        ver_match,
         end=" ",
     )
-    path = shutil.which(exe_name)  # find the installed binary
-    if path is None:
+    exe_path = shutil.which(exe_name)  # find the installed binary
+    if exe_path is None:
         print()  # print end-of-line
         return None  # failed to locate the binary
-    path = Path(path).resolve()
+    path = Path(exe_path).resolve()
     print("at", str(path))
-    ver_num = ver_num.groups(0)[0].decode(encoding="utf-8").split(".")
-    if ver_num is None or ver_num[0] != ver_major:
+    ver_tuple = ver_match.split(".")
+    if ver_tuple is None or ver_tuple[0] != str(version.info[0]):
         return None  # version is unknown or not the desired major release
     return path
 
@@ -160,7 +159,7 @@ def create_sym_link(
     version: str,
     install_dir: str,
     overwrite: bool = False,
-    target: Path = None,
+    target: Optional[Path] = None,
 ) -> bool:
     """Create a symlink to the installed binary that
     doesn't have the version number appended.
@@ -249,7 +248,7 @@ def uninstall_clang_tools(version: str, directory: str):
 
 
 def install_clang_tools(
-    version: str, tools: str, directory: str, overwrite: bool, no_progress_bar: bool
+    version: Version, tools: str, directory: str, overwrite: bool, no_progress_bar: bool
 ) -> None:
     """Wraps functions used to individually install tools.
 
@@ -261,7 +260,7 @@ def install_clang_tools(
     :param no_progress_bar: A flag used to disable the downloads' progress bar.
     """
     install_dir = install_dir_name(directory)
-    if install_dir.rstrip(os.sep) not in os.environ.get("PATH"):
+    if install_dir.rstrip(os.sep) not in os.environ.get("PATH", ""):
         print(
             f"{YELLOW}{install_dir}",
             f"directory is not in your environment variable PATH.{RESET_COLOR}",
@@ -270,7 +269,7 @@ def install_clang_tools(
         native_bin = is_installed(tool_name, version)
         if native_bin is None:  # (not already installed)
             # `install_tool()` guarantees that the binary exists now
-            install_tool(tool_name, version, install_dir, no_progress_bar)
+            install_tool(tool_name, version.string, install_dir, no_progress_bar)
         create_sym_link(  # pragma: no cover
-            tool_name, version, install_dir, overwrite, native_bin
+            tool_name, version.string, install_dir, overwrite, native_bin
         )

clang_tools/main.py

@@ -4,10 +4,12 @@
 
 The module containing main entrypoint function.
 """
+
 import argparse
 
 from .install import install_clang_tools, uninstall_clang_tools
 from . import RESET_COLOR, YELLOW
+from .util import Version
 
 
 def get_parser() -> argparse.ArgumentParser:
@@ -18,7 +20,9 @@ def get_parser() -> argparse.ArgumentParser:
         "-i",
         "--install",
         metavar="VERSION",
-        help="Install clang-tools about a specific version.",
+        help="Install clang-tools about a specific version. This can be in the form of"
+        " a semantic version specification (``x.y.z``, ``x.y``, ``x``). NOTE: A "
+        "malformed version specification will cause a silent failure.",
     )
     parser.add_argument(
         "-t",
@@ -66,13 +70,20 @@ def main():
     if args.uninstall:
         uninstall_clang_tools(args.uninstall, args.directory)
     elif args.install:
-        install_clang_tools(
-            args.install,
-            args.tool,
-            args.directory,
-            args.overwrite,
-            args.no_progress_bar,
-        )
+        version = Version(args.install)
+        if version.info != (0, 0, 0):
+            install_clang_tools(
+                version,
+                args.tool,
+                args.directory,
+                args.overwrite,
+                args.no_progress_bar,
+            )
+        else:
+            print(
+                f"{YELLOW}The version specified is not a semantic",
+                f"specification{RESET_COLOR}",
+            )
     else:
         print(
             f"{YELLOW}Nothing to do because `--install` and `--uninstall`",

clang_tools/util.py

@@ -4,11 +4,12 @@
 
 A module containing utility functions.
 """
+
 import platform
 import hashlib
 from pathlib import Path
 import urllib.request
-from typing import Optional
+from typing import Optional, Tuple
 from urllib.error import HTTPError
 from http.client import HTTPResponse
 
@@ -82,7 +83,6 @@ def get_sha_checksum(binary_url: str) -> str:
     with urllib.request.urlopen(
         binary_url.replace(".exe", "") + ".sha512sum"
     ) as response:
-        response: HTTPResponse
         return response.read(response.length).decode(encoding="utf-8")
 
 
@@ -99,3 +99,27 @@ def verify_sha512(checksum: str, exe: bytes) -> bool:
         # released checksum's include the corresponding filename (which we don't need)
         checksum = checksum.split(" ", 1)[0]
     return checksum == hashlib.sha512(exe).hexdigest()
+
+
+class Version:
+    """Parse the given version string into a semantic specification.
+
+    :param user_input: The version specification as a string.
+    """
+
+    def __init__(self, user_input: str):
+        #: The version input in string form
+        self.string = user_input
+        version_tuple = user_input.split(".")
+        self.info: Tuple[int, int, int]
+        """
+        A tuple of integers that describes the major, minor, and patch versions.
+        If the version `string` is a path, then this tuple is just 3 zeros.
+        """
+        if len(version_tuple) < 3:
+            # append minor and patch version numbers if not specified
+            version_tuple += ["0"] * (3 - len(version_tuple))
+        try:
+            self.info = tuple([int(x) for x in version_tuple])  # type: ignore[assignment]
+        except ValueError:
+            self.info = (0, 0, 0)

docs/_static/extra_css.css

@@ -3,3 +3,46 @@ thead {
   background-color: var(--md-accent-bg-color--light);
   color: var(--md-default-bg-color);
 }
+
+.md-typeset .mdx-badge {
+  font-size: .85em
+}
+
+.md-typeset .mdx-badge--right {
+  float: right;
+  margin-left: .35em
+}
+
+.md-typeset .mdx-badge__icon {
+  background: var(--md-accent-fg-color--transparent);
+  padding: .2rem;
+}
+
+.md-typeset .mdx-badge__icon:last-child {
+  border-radius: .1rem;
+}
+
+[dir=ltr] .md-typeset .mdx-badge__icon {
+  border-top-left-radius: .1rem;
+  border-bottom-left-radius: .1rem;
+}
+
+[dir=rtl] .md-typeset .mdx-badge__icon {
+  border-top-right-radius: .1rem;
+  border-bottom-right-radius: .1rem;
+}
+
+.md-typeset .mdx-badge__text {
+  box-shadow: 0 0 0 1px inset var(--md-accent-fg-color--transparent);
+  padding: .2rem .3rem;
+}
+
+[dir=ltr] .md-typeset .mdx-badge__text {
+  border-top-right-radius: .1rem;
+  border-bottom-right-radius: .1rem;
+}
+
+[dir=rtl] .md-typeset .mdx-badge__text {
+  border-top-left-radius: .1rem;
+  border-bottom-left-radius: .1rem;
+}