From 6a28e02cad11443982eefba75b5c681733f0b96d Mon Sep 17 00:00:00 2001
From: John Turner <jturner.usa@gmail.com>
Date: Mon, 29 Sep 2025 00:39:02 -0400
Subject: use installed USE flags to filter reverse dependencies in equery
 depends

---
 pym/gentoolkit/dependencies.py   | 19 +++++++++++++++++++
 pym/gentoolkit/equery/depends.py | 18 +++++++++++++++++-
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/pym/gentoolkit/dependencies.py b/pym/gentoolkit/dependencies.py
index be5c71f..45f4759 100644
--- a/pym/gentoolkit/dependencies.py
+++ b/pym/gentoolkit/dependencies.py
@@ -23,12 +23,23 @@ from gentoolkit import errors
 from gentoolkit.atom import Atom
 from gentoolkit.query import Query
 from gentoolkit.cpv import CPV
+from gentoolkit.flag import get_final_flags
 
 # =======
 # Classes
 # =======
 
 
+@cache
+def is_installed(cpv: CPV) -> bool:
+    return cpv in portage.db[portage.root]["vartree"].dbapi.cpv_all()
+
+
+@cache
+def flags_cache(cpv: CPV) -> List[str]:
+    return get_final_flags(cpv)
+
+
 class DependencyKind(Enum):
     DEPEND = "DEPEND"
     RDEPEND = "RDEPEND"
@@ -190,6 +201,7 @@ class Dependencies(Query):
         pkgset: Iterable[Union[str, CPV]],
         max_depth: Optional[int] = None,
         only_direct: bool = True,
+        conditionals: bool = False,
         # The rest of these are only used internally:
         depth: int = 0,
         seen: Optional[Set[str]] = None,
@@ -238,6 +250,13 @@ class Dependencies(Query):
             found_match = False
             for dep in pkgdep.get_all_depends():
                 if dep.intersects(self):
+                    if conditionals and is_installed(pkgdep.cpv):
+                        if (
+                            dep.use_conditional is not None
+                            and dep.use_conditional not in flags_cache(pkgdep.cpv)
+                        ):
+                            continue
+
                     pkgdep.depatom = dep
                     pkgdep.depth = depth
                     yield pkgdep
diff --git a/pym/gentoolkit/equery/depends.py b/pym/gentoolkit/equery/depends.py
index 39e0b25..34ac974 100644
--- a/pym/gentoolkit/equery/depends.py
+++ b/pym/gentoolkit/equery/depends.py
@@ -28,6 +28,7 @@ QUERY_OPTS = {
     "only_direct": True,
     "max_depth": None,
     "package_format": None,
+    "conditionals": False,
 }
 
 # =======
@@ -154,6 +155,10 @@ def print_help(with_description=True):
                 (" -D, --indirect", "search both direct and indirect dependencies"),
                 (" -F, --format=TMPL", "specify a custom output format"),
                 ("     --depth=N", "limit indirect dependency tree to specified depth"),
+                (
+                    "     --conditionals",
+                    "filter conditional dependencies using your installed flags",
+                ),
             )
         )
     )
@@ -174,6 +179,8 @@ def parse_module_options(module_opts):
             QUERY_OPTS["only_direct"] = False
         elif opt in ("-F", "--format"):
             QUERY_OPTS["package_format"] = posarg
+        elif opt in ("--conditionals"):
+            QUERY_OPTS["conditionals"] = True
         elif opt in ("--depth"):
             if posarg.isdigit():
                 depth = int(posarg)
@@ -189,7 +196,15 @@ def parse_module_options(module_opts):
 def main(input_args):
     """Parse input and run the program"""
     short_opts = "hadDF:"  # -d, --direct was old option for default action
-    long_opts = ("help", "all-packages", "direct", "indirect", "format", "depth=")
+    long_opts = (
+        "help",
+        "all-packages",
+        "direct",
+        "indirect",
+        "format",
+        "depth=",
+        "conditionals",
+    )
 
     try:
         module_opts, queries = gnu_getopt(input_args, short_opts, long_opts)
@@ -233,6 +248,7 @@ def main(input_args):
             pkgset=sorted(pkggetter()),
             only_direct=QUERY_OPTS["only_direct"],
             max_depth=QUERY_OPTS["max_depth"],
+            conditionals=QUERY_OPTS["conditionals"],
         ):
             if last_seen is None or last_seen != pkgdep:
                 seen = False
-- 
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