Filter dependencies to only include those from a given package

piptools/scripts/compile.py

@@ -44,6 +44,18 @@
 METADATA_FILENAMES = frozenset({"setup.py", "setup.cfg", "pyproject.toml"})
 
 
+def _filter_dependencies(dependencies, only_from_packages):
+    """
+    Filter dependencies to include only those required by the specified packages.
+    """
+    filtered_dependencies = [
+        dep
+        for dep in dependencies
+        if dep.comes_from and dep.comes_from in only_from_packages
+    ]
+    return set(filtered_dependencies)
+
+
 def _determine_linesep(
     strategy: str = "preserve", filenames: tuple[str, ...] = ()
 ) -> str:
@@ -101,6 +113,7 @@ def _determine_linesep(
 @options.upgrade
 @options.upgrade_package
 @options.output_file
+@options.only_from
 @options.newline
 @options.allow_unsafe
 @options.strip_extras
@@ -146,6 +159,7 @@ def cli(
     upgrade: bool,
     upgrade_packages: tuple[str, ...],
     output_file: LazyFile | IO[Any] | None,
+    only_from: list[str] | None,
     newline: str,
     allow_unsafe: bool,
     strip_extras: bool | None,
@@ -505,6 +519,9 @@ def cli(
             "or use --no-strip-extras to retain the existing behavior."
         )
 
+    if only_from:
+        results = _filter_dependencies(results, only_from_packages=only_from)
+
     ##
     # Output
     ##

piptools/scripts/options.py

@@ -191,6 +191,12 @@ def _get_default_option(option_name: str) -> Any:
     ),
 )
 
+only_from = click.option(
+    "--only-from",
+    multiple=True,
+    help="Only include dependencies from given packages; may be used more than once",
+)
+
 newline = click.option(
     "--newline",
     type=click.Choice(("LF", "CRLF", "native", "preserve"), case_sensitive=False),