ligature option no longer effect cvXX, add --feat cli args #267

build.py

@@ -61,6 +61,11 @@ def parse_args():
         type=str,
         help="Setup output directory prefix",
     )
+    parser.add_argument(
+        "--feat",
+        type=lambda x: x.strip().split(","),
+        help="Freeze font features, splited by `,` (e.g. `--feat zero,cv01,ss07,ss08`)",
+    )
     parser.add_argument(
         "--hinted",
         dest="hinted",
@@ -242,6 +247,11 @@ class FontConfig:
                 if "github_mirror" not in self.nerd_font:
                     self.nerd_font["github_mirror"] = "github.com"
 
+                if args.feat is not None:
+                    for f in args.feat:
+                        if f in self.feature_freeze:
+                            self.feature_freeze[f] = "enable"
+
                 if args.hinted is not None:
                     self.use_hinted = args.hinted
 
@@ -344,12 +354,10 @@ def handle_ligatures(
     """
     whether to enable ligatures and freeze font features
     """
-    if not enable_ligature:
-        del font["GSUB"]
-        return
 
     freeze_feature(
         font=font,
+        calt=enable_ligature,
         moving_rules=["ss03", "ss07", "ss08"],
         config=freeze_config,
     )

source/py/feature.py

@@ -1,4 +1,4 @@
-def freeze_feature(font, moving_rules, config):
+def freeze_feature(font, calt, moving_rules, config):
     # check feature list
     feature_record = font["GSUB"].table.FeatureList.FeatureRecord
     feature_dict = {
@@ -7,9 +7,14 @@ def freeze_feature(font, moving_rules, config):
         if feature.FeatureTag != "calt"
     }
 
+    if calt:
         calt_features = [
             feature.Feature for feature in feature_record if feature.FeatureTag == "calt"
         ]
+    else:
+        for feature in feature_record:
+            if feature.FeatureTag == "calt":
+                feature.LookupListIndex = []
 
     # Process features
     for tag, status in config.items():
@@ -21,7 +26,7 @@ def freeze_feature(font, moving_rules, config):
             target_feature.LookupListIndex = []
             continue
 
-        if tag in moving_rules:
+        if tag in moving_rules and calt:
             # Enable by moving rules into "calt"
             for calt_feat in calt_features:
                 calt_feat.LookupListIndex.extend(target_feature.LookupListIndex)

source/schema.json

@@ -36,7 +36,7 @@
     },
     "ligature": {
       "type": "boolean",
-      "description": "Whether to enable ligature. Remove all the ligatures if set to false",
+      "description": "Whether to enable ligature.\nIf set to false, all the ligatures will be removed and 'ssXX' options in 'feature_freeze' will no longer effect",
       "default": true
     },
     "feature_freeze": {