1 files changed, 68 insertions, 0 deletions
diff --git a/Lib/fontTools/otlLib/optimize/__init__.py b/Lib/fontTools/otlLib/optimize/__init__.py
new file mode 100644
index 00000000..5c007e89
--- /dev/null
+++ b/Lib/fontTools/otlLib/optimize/__init__.py
@@ -0,0 +1,68 @@
+from argparse import RawTextHelpFormatter
+from textwrap import dedent
+
+from fontTools.ttLib import TTFont
+from fontTools.otlLib.optimize.gpos import compact, GPOS_COMPACT_MODE_DEFAULT
+
+def main(args=None):
+    """Optimize the layout tables of an existing font."""
+    from argparse import ArgumentParser
+    from fontTools import configLogger
+
+    parser = ArgumentParser(prog="otlLib.optimize", description=main.__doc__, formatter_class=RawTextHelpFormatter)
+    parser.add_argument("font")
+    parser.add_argument(
+        "-o", metavar="OUTPUTFILE", dest="outfile", default=None, help="output file"
+    )
+    parser.add_argument(
+        "--gpos-compact-mode",
+        help=dedent(
+            f"""\
+            GPOS Lookup type 2 (PairPos) compaction mode:
+                0 = do not attempt to compact PairPos lookups;
+                1 to 8 = create at most 1 to 8 new subtables for each existing
+                    subtable, provided that it would yield a 50%% file size saving;
+                9 = create as many new subtables as needed to yield a file size saving.
+            Default: {GPOS_COMPACT_MODE_DEFAULT}.
+
+            This compaction aims to save file size, by splitting large class
+            kerning subtables (Format 2) that contain many zero values into
+            smaller and denser subtables. It's a trade-off between the overhead
+            of several subtables versus the sparseness of one big subtable.
+
+            See the pull request: https://github.com/fonttools/fonttools/pull/2326
+            """
+        ),
+        default=int(GPOS_COMPACT_MODE_DEFAULT),
+        choices=list(range(10)),
+        type=int,
+    )
+    logging_group = parser.add_mutually_exclusive_group(required=False)
+    logging_group.add_argument(
+        "-v", "--verbose", action="store_true", help="Run more verbosely."
+    )
+    logging_group.add_argument(
+        "-q", "--quiet", action="store_true", help="Turn verbosity off."
+    )
+    options = parser.parse_args(args)
+
+    configLogger(
+        level=("DEBUG" if options.verbose else "ERROR" if options.quiet else "INFO")
+    )
+
+    font = TTFont(options.font)
+    # TODO: switch everything to have type(mode) = int when using the Config class
+    compact(font, str(options.gpos_compact_mode))
+    font.save(options.outfile or options.font)
+
+
+
+if __name__ == "__main__":
+    import sys
+
+    if len(sys.argv) > 1:
+        sys.exit(main())
+    import doctest
+
+    sys.exit(doctest.testmod().failed)
+