From aeff093f489b6ee5dd7fa21c687c7f1498ef0ce8 Mon Sep 17 00:00:00 2001
From: Just van Rossum <justvanrossum@gmail.com>
Date: Sat, 2 Dec 2023 15:25:26 +0100
Subject: [PATCH] Support writing lib to designspace and .fontra, make
 copyFont() copy lib

---
 src/fontra/backends/copy.py        | 1 +
 src/fontra/backends/designspace.py | 6 +++++-
 src/fontra/backends/fontra.py      | 6 +++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/fontra/backends/copy.py b/src/fontra/backends/copy.py
index 725738032..2fb66d57e 100644
--- a/src/fontra/backends/copy.py
+++ b/src/fontra/backends/copy.py
@@ -14,6 +14,7 @@ async def copyFont(
     sourceBackend, destBackend, *, glyphNames=None, numTasks=1, progressInterval=0
 ):
     await destBackend.putGlobalAxes(await sourceBackend.getGlobalAxes())
+    await destBackend.putFontLib(await sourceBackend.getFontLib())
     glyphMap = await sourceBackend.getGlyphMap()
     glyphNamesInFont = set(glyphMap)
     glyphNamesToCopy = sorted(
diff --git a/src/fontra/backends/designspace.py b/src/fontra/backends/designspace.py
index b80723bde..e6ffb6e60 100644
--- a/src/fontra/backends/designspace.py
+++ b/src/fontra/backends/designspace.py
@@ -561,7 +561,11 @@ async def getUnitsPerEm(self):
         return self.defaultFontInfo.unitsPerEm
 
     async def getFontLib(self):
-        return self.dsDoc.lib
+        return deepcopy(self.dsDoc.lib)
+
+    async def putFontLib(self, lib):
+        self.dsDoc.lib = deepcopy(lib)
+        self.dsDoc.write(self.dsDoc.path)
 
     async def watchExternalChanges(self):
         ufoPaths = sorted(set(self.ufoLayers.iterAttrs("path")))
diff --git a/src/fontra/backends/fontra.py b/src/fontra/backends/fontra.py
index 76e361ef3..d6333e945 100644
--- a/src/fontra/backends/fontra.py
+++ b/src/fontra/backends/fontra.py
@@ -96,7 +96,11 @@ async def putGlobalAxes(self, axes):
         self._scheduler.schedule(self._writeFontData)
 
     async def getFontLib(self):
-        return {}
+        return deepcopy(self.fontData.lib)
+
+    async def putFontLib(self, lib):
+        self.fontData.lib = deepcopy(lib)
+        self._scheduler.schedule(self._writeFontData)
 
     def _readGlyphInfo(self):
         with open(self.glyphInfoPath, "r", encoding="utf-8") as file: