From c4bc38057710b6cdee19fd07ae04736fd4fdac76 Mon Sep 17 00:00:00 2001
From: mishamyrt <misha@myrt.co>
Date: Fri, 31 Mar 2023 10:59:16 +0300
Subject: [PATCH] Add forced feature activation to the builder

---
 CHANGELOG.md     |  3 ++-
 README.md        | 22 ++++++++++++++++++++++
 scripts/lilex.py | 40 +++++++++++++++++++++++++++++++---------
 3 files changed, 55 insertions(+), 10 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7587c9b7..a58d6324 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,11 +5,12 @@ All notable changes to this project will be documented in this file.
 
 ## Fixed
 
-* `04F8`, `042B` (ы, Ы) point order (In 400-700 the scaling was broken)
+* `044B` (`ы`), `042B` (`Ы`) point order (In 400-700 the scaling was broken)
 
 ## Added
 
 * Arrows (and Markdown tables). `<<-|->>`, `|--|--|--|`
+* Forced feature activation in the builder
 
 ## [2.000] — March 28, 2023
 
diff --git a/README.md b/README.md
index c94d29c0..d608b348 100644
--- a/README.md
+++ b/README.md
@@ -68,6 +68,28 @@ Now run the command to build it.
 make build
 ```
 
+or
+
+```sh
+./scripts/lilex.py build
+```
+
+### Forced feature activation
+
+The builder gives you the ability to forcibly enable any font features. This works by moving their code to the calt. If ligatures work, the selected features will also work.
+
+To do this, regenerate the source file with the features:
+
+```sh
+./scripts/lilex.py --features 'sups,zero' generate -o Lilex.custom.glyphs
+```
+
+And then build the binaries from the new source:
+
+```sh
+./scripts/lilex.py -i Lilex.custom.glyphs build
+```
+
 ## Credits
 
 -   Author: Mikhael Khrustik
diff --git a/scripts/lilex.py b/scripts/lilex.py
index 49124a74..8afa761c 100755
--- a/scripts/lilex.py
+++ b/scripts/lilex.py
@@ -1,9 +1,12 @@
 #!/usr/bin/env python3
 """Lilex helper entrypoint"""
-from arrrgs import arg, command, run, global_args
+import sys
+from typing import List
+
+from arrrgs import arg, command, global_args, run
 from builder import SUPPORTED_FORMATS, GlyphsFont
 from generator import generate_spacers, render_ligatures
-from glyphsLib import GSFeature
+from glyphsLib import GSFeature, GSFont
 from utils import read_classes, read_features, read_files
 
 FONT_FILE = "Lilex.glyphs"
@@ -12,7 +15,9 @@
 OUT_DIR = "./build"
 
 global_args(
-    arg("--input", "-i", default=FONT_FILE, help="Input .glyphs file")
+    arg("--input", "-i", default=FONT_FILE, help="Input .glyphs file"),
+    arg("--features", "-f",
+    help="A list of features that will be \"baked\" into the font. Comma separated, no spaces")
 )
 
 @command(
@@ -36,20 +41,37 @@ def generate_calt(font: GlyphsFont) -> GSFeature:
     code = render_ligatures(glyphs) + read_files(f"{FEATURES_DIR}/calt")
     return GSFeature("calt", code)
 
-def prepare(args):
+def move_to_calt(font: GSFont, features: List[str]):
+    for fea in features:
+        if fea not in font.features:
+            print(f"Unknown feature: '{fea}'")
+            print(font.features)
+            sys.exit(1)
+        # Move the code of the feature to the calt,
+        # which is executed in most cases
+        feature = font.features[fea]
+        feature.disabled = True
+        font.features["calt"].code += "\n" + feature.code
+        # Remove feature from aalt
+        aalt = font.features["aalt"]
+        aalt.code = aalt.code.replace(f"feature {fea};\n", "")
+
+def create_font(args):
     font = GlyphsFont(args.input)
 
     cls = read_classes(CLASSES_DIR)
     fea = read_features(FEATURES_DIR)
 
-    print(generate_calt(font))
-    fea.append(generate_calt(font))
-
+    calt = generate_calt(font)
+    fea.append(calt)
     generate_spacers(font.ligatures(), font.file.glyphs)
-
     font.set_classes(cls)
     font.set_features(fea)
+
+    if args.features is not None:
+        features = args.features.split(",")
+        move_to_calt(font.file, features)
     return args, font
 
 if __name__ == "__main__":
-    run(prepare=prepare)
+    run(prepare=create_font)