From ae75eae20fcae8d2394a44faef1aff78a4e3c1e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9ana=20=E6=B1=9F?= <leana.jiang+git@icloud.com>
Date: Fri, 23 Jan 2026 02:09:23 +0100
Subject: [PATCH] vanadium: implement conditional fontsize in fontconfig

---
 nix/configurations/vanadium/home/misc.nix | 40 +++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/nix/configurations/vanadium/home/misc.nix b/nix/configurations/vanadium/home/misc.nix
index 2577e970..24c1aa1c 100644
--- a/nix/configurations/vanadium/home/misc.nix
+++ b/nix/configurations/vanadium/home/misc.nix
@@ -17,6 +17,46 @@
       monospace = [ "IosevkaPTMono" ];
       emoji = [ "Noto Color Emoji" ];
     };
+
+    configFile = {
+      thick-iosevka = {
+        enable = true;
+        # https://www.freedesktop.org/software/fontconfig/fontconfig-user.html
+        # https://gist.github.com/yuttie/adb22a6c07ef8e75d82e48d5484b7ad8
+        # https://github.com/N1k3YB/CS2FontChanger_ru/blob/5f1d8189220f42286d773c536ff83a49b2556da2/app.py#L227
+        #
+        # Use the following script to test
+        # for size in (seq 9 15)
+        #     echo
+        #     echo
+        #     for weight in {regular,medium,bold}
+        #         echo "weight=$weight:size=$size"
+        #         fc-match "mono:weight=$weight:size=$size"
+        #     end
+        # end | less
+        text = /* xml */ ''
+          <?xml version="1.0"?>
+          <!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
+          <fontconfig>
+            <match target="pattern">
+              <test name="family" compare="contains"><string>Iosevka</string></test>
+              <edit name="weight" mode="assign" binding="strong">
+                <if> <eq><name>weight</name><const>bold</const></eq> <!-- then --> <const>bold</const>
+                  <if> <eq><name>weight</name><const>medium</const></eq> <!-- then --> <const>medium</const>
+                    <!-- not bold nor medium -->
+                    <if> <more><name>size</name><double>15</double></more> <!-- then --> <const>regular</const>
+                      <if> <more><name>size</name><double>10</double></more> <!-- then --> <const>medium</const>
+                        <!-- else --> <const>bold</const>
+                      </if>
+                    </if>
+                  </if>
+                </if>
+              </edit>
+            </match>
+          </fontconfig>
+        '';
+      };
+    };
   };
   home.packages = [
     pkgs.noto-fonts