ls-vendors/list_vendors() filter by OS/arch

docs/api.md

@@ -11,6 +11,9 @@ SPDX-License-Identifier: MIT
 ```{eval-rst}
 .. autofunction:: cjdk.list_vendors
 .. versionadded:: 0.4.0
+.. versionchanged:: 0.6.0
+   Now filters vendors by the given os/arch, which default to the current
+   platform.
 ```
 
 ```{eval-rst}

docs/changelog.md

@@ -10,6 +10,11 @@ See also the section on [versioning](versioning-scheme).
 
 ## [Unreleased]
 
+### Changed
+
+- `list_vendors()` and `ls-vendors` now filter vendors by OS and architecture,
+  defaulting to the current platform.
+
 ## [0.5.0] - 2026-01-07
 
 ### Added

docs/cli.md

@@ -52,6 +52,9 @@ successful, returns the exit code of the launched program.
 
 ```{eval-rst}
 .. versionadded:: 0.4.0
+.. versionchanged:: 0.6.0
+   Now filters vendors by the ``--os`` and ``--arch`` options, which default to
+   the current platform.
 ```
 
 ## Working with cached JDKs

src/cjdk/_api.py

@@ -49,16 +49,16 @@ def list_vendors(**kwargs: Unpack[ConfigKwargs]) -> list[str]:
     """
     Return the list of available JDK vendors.
 
-    Parameters
-    ----------
-    None
-
     Other Parameters
     ----------------
     cache_dir : pathlib.Path or str, optional
         Override the root cache directory.
     index_url : str, optional
         Alternative URL for the JDK index.
+    os : str, optional
+        Operating system for the JDK (default: current operating system).
+    arch : str, optional
+        CPU architecture for the JDK (default: current architecture).
 
     Returns
     -------
@@ -71,6 +71,10 @@ def list_vendors(**kwargs: Unpack[ConfigKwargs]) -> list[str]:
         If configuration is invalid.
     InstallError
         If fetching the index fails.
+
+    .. versionchanged:: 0.6.0
+       Now filters vendors by the given os/arch, which default to the current
+       platform.
     """
     conf = _conf.configure(**kwargs)
     return sorted(_jdk.available_vendors(conf))

src/cjdk/_jdk.py

@@ -29,18 +29,19 @@
 
 def available_vendors(conf: Configuration) -> set[str]:
     """
-    Return the set of available JDK vendor names.
+    Return the set of available JDK vendor names for the configured OS and arch.
 
     Arguments:
-    conf -- Configuration (currently unused, for future os/arch filtering)
+    conf -- Configuration (uses os and arch for filtering)
     """
-    _ = conf
     index = _index.jdk_index(conf)
+    try:
+        vendors = index[conf.os][conf.arch]
+    except KeyError:
+        return set()
     return {
         vendor.removeprefix("jdk@")
-        for os in index
-        for arch in index[os]
-        for vendor in index[os][arch]
+        for vendor in vendors
         if vendor.startswith("jdk@")
     }
 

tests/test_api.py

@@ -154,3 +154,58 @@ def test_env_var_set():
     with f("CJDK_TEST_ENV_VAR", "testvalue"):
         assert os.environ["CJDK_TEST_ENV_VAR"] == "testvalue"
     assert "CJDK_TEST_ENV_VAR" not in os.environ
+
+
+def test_list_vendors(tmp_path):
+    with mock_server.start(
+        endpoint="/index.json",
+        data={
+            "linux": {
+                "amd64": {
+                    "jdk@adoptium": {"17": "zip+http://example.com/a.zip"},
+                    "jdk@zulu": {"17": "zip+http://example.com/z.zip"},
+                },
+                "arm64": {
+                    "jdk@adoptium": {"17": "zip+http://example.com/a.zip"},
+                },
+            },
+            "darwin": {
+                "amd64": {
+                    "jdk@graalvm": {"17": "zip+http://example.com/g.zip"},
+                },
+            },
+        },
+    ) as server:
+        vendors_linux_amd64 = _api.list_vendors(
+            os="linux",
+            arch="amd64",
+            cache_dir=tmp_path / "cache",
+            index_url=server.url("/index.json"),
+            _allow_insecure_for_testing=True,
+        )
+        vendors_linux_arm64 = _api.list_vendors(
+            os="linux",
+            arch="arm64",
+            cache_dir=tmp_path / "cache",
+            index_url=server.url("/index.json"),
+            _allow_insecure_for_testing=True,
+        )
+        vendors_darwin_amd64 = _api.list_vendors(
+            os="darwin",
+            arch="amd64",
+            cache_dir=tmp_path / "cache",
+            index_url=server.url("/index.json"),
+            _allow_insecure_for_testing=True,
+        )
+        vendors_nonexistent = _api.list_vendors(
+            os="windows",
+            arch="amd64",
+            cache_dir=tmp_path / "cache",
+            index_url=server.url("/index.json"),
+            _allow_insecure_for_testing=True,
+        )
+
+    assert vendors_linux_amd64 == ["adoptium", "zulu"]
+    assert vendors_linux_arm64 == ["adoptium"]
+    assert vendors_darwin_amd64 == ["graalvm"]
+    assert vendors_nonexistent == []

tests/test_integration.py

@@ -6,7 +6,7 @@
 
 
 def test_list_vendors():
-    vendors = _api.list_vendors()
+    vendors = _api.list_vendors(os="linux", arch="amd64")
     assert vendors is not None
     assert "adoptium" in vendors
     assert "corretto" in vendors