NL build in release, add suffix NL to name if disable ligature

build.py

@@ -298,10 +298,11 @@ class FontConfig:
                 if args.cn_narrow:
                     self.cn["narrow"] = True
 
-                if self.debug:
-                    self.family_name += " Debug"
-
                 name_arr = [word.capitalize() for word in self.family_name.split(" ")]
+                if not self.enable_liga:
+                    name_arr.append("NL")
+                if self.debug:
+                    name_arr.append("Debug")
                 self.family_name = " ".join(name_arr)
                 self.family_name_compact = "".join(name_arr)
 

release.py

@@ -12,7 +12,7 @@ def move_and_log(file_path: str, target_path: str):
     print(f"Move {file_path} -> {target_path}")
     move(file_path, target_path)
 
-def build(normal: bool, hinted: bool, cache: bool = False):
+def build(normal: bool, hinted: bool, liga: bool, cache: bool = False):
     args = [
         "python",
         "build.py",
@@ -31,6 +31,11 @@ def build(normal: bool, hinted: bool, cache: bool = False):
     else:
         args.append("--no-hinted")
 
+    if liga:
+        args.append("--liga")
+    else:
+        args.append("--no-liga")
+
     print(" ".join(args))
     subprocess.run(args)
 
@@ -53,10 +58,14 @@ rmtree(output_release, ignore_errors=True)
 mkdir(output_release)
 
 # build all formats
-build(normal=True, hinted=True)
-build(normal=True, hinted=False, cache=True)
-build(normal=False, hinted=True)
-build(normal=False, hinted=False, cache=True)
+build(normal=True, liga=True, hinted=True)
+build(normal=True, liga=True, hinted=False, cache=True)
+build(normal=True, liga=False, hinted=True)
+build(normal=True, liga=False, hinted=False, cache=True)
+build(normal=False, liga=True, hinted=True)
+build(normal=False, liga=True, hinted=False, cache=True)
+build(normal=False, liga=False, hinted=True)
+build(normal=False, liga=False, hinted=False, cache=True)
 
 # copy woff2 to root
 rmtree("woff2", ignore_errors=True)

source/py/feature.py

@@ -48,8 +48,10 @@ def freeze_feature(font, calt, moving_rules=[], config={}):
             glyph_dict = font["glyf"].glyphs
             hmtx_dict = font["hmtx"].metrics
             for index in target_feature.LookupListIndex:
-                lookup = font["GSUB"].table.LookupList.Lookup[index]
-                for old_key, new_key in lookup.SubTable[0].mapping.items():
+                lookup = font["GSUB"].table.LookupList.Lookup[index].SubTable[0].mapping
+                if not lookup:
+                    continue
+                for old_key, new_key in lookup.items():
                     if (
                         old_key in glyph_dict
                         and old_key in hmtx_dict