From 60a4f7a454608ead6af57941ee9a2037dddea5a6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nico=20Schl=C3=B6mer?= <nico.schloemer@gmail.com>
Date: Thu, 20 Jan 2022 10:27:54 +0100
Subject: [PATCH 1/2] select keys in int_data_to_sets

---
 src/meshio/_mesh.py | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/src/meshio/_mesh.py b/src/meshio/_mesh.py
index c416861a6..65646d349 100644
--- a/src/meshio/_mesh.py
+++ b/src/meshio/_mesh.py
@@ -358,15 +358,19 @@ def sets_to_int_data(self):
             self.point_data[data_name] = intfun
             self.point_sets = {}
 
-    def int_data_to_sets(self):
+    def int_data_to_sets(self, keys: list[str] | None = None):
         """Convert all int data to {point,cell}_sets, where possible."""
-        keys = []
+        rm_keys = []
         for key, data in self.cell_data.items():
+            if keys is not None:
+                if key not in keys:
+                    continue
+
             # handle all int and uint data
             if not all(v.dtype.kind in ["i", "u"] for v in data):
                 continue
 
-            keys.append(key)
+            rm_keys.append(key)
 
             # this call can be rather expensive
             tags = np.unique(np.concatenate(data))
@@ -379,7 +383,7 @@ def int_data_to_sets(self):
             names = list(dict.fromkeys(names))
             if len(names) != len(tags):
                 # alternative names
-                names = [f"set{tag}" for tag in tags]
+                names = [f"set-{key}-{tag}" for tag in tags]
 
             # TODO there's probably a better way besides np.where, something from
             # np.unique or np.sort
@@ -387,17 +391,21 @@ def int_data_to_sets(self):
                 self.cell_sets[name] = [np.where(d == tag)[0] for d in data]
 
         # remove the cell data
-        for key in keys:
+        for key in rm_keys:
             del self.cell_data[key]
 
         # now point data
-        keys = []
+        rm_keys = []
         for key, data in self.point_data.items():
+            if keys is not None:
+                if key not in keys:
+                    continue
+
             # handle all int and uint data
             if not all(v.dtype.kind in ["i", "u"] for v in data):
                 continue
 
-            keys.append(key)
+            rm_keys.append(key)
 
             # this call can be rather expensive
             tags = np.unique(data)
@@ -418,5 +426,5 @@ def int_data_to_sets(self):
                 self.point_sets[name] = np.where(data == tag)[0]
 
         # remove the cell data
-        for key in keys:
+        for key in rm_keys:
             del self.point_data[key]

From 43a1b4d2293ef6468a9367659bb222b6606ea1fe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nico=20Schl=C3=B6mer?= <nico.schloemer@gmail.com>
Date: Thu, 20 Jan 2022 10:28:14 +0100
Subject: [PATCH 2/2] version bump

---
 setup.cfg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/setup.cfg b/setup.cfg
index ba6c23d2d..422674df0 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = meshio
-version = 5.2.3
+version = 5.2.4
 author = Nico Schlömer et al.
 author_email = nico.schloemer@gmail.com
 description = I/O for many mesh formats