vt: move UCS tables to the "shipped" form

Use the "shipped" mechanism to copy pre-generated tables to the build
tree by default. If GENERATE_UCS_TABLES=1 then they are generated at
build time instead. If GENERATE_UCS_TABLES=2 then
gen_ucs_recompose_table.py is invoked with --full.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Suggested-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250417184849.475581-15-nico@fluxnic.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/vt/Makefile

@@ -11,7 +11,8 @@ obj-$(CONFIG_CONSOLE_TRANSLATIONS)	+= consolemap.o consolemap_deftbl.o \
 					   ucs.o
 
 # Files generated that shall be removed upon make clean
-clean-files := consolemap_deftbl.c defkeymap.c
+clean-files :=	consolemap_deftbl.c defkeymap.c \
+		ucs_width_table.h ucs_recompose_table.h
 
 hostprogs += conmakehash
 
@@ -34,3 +35,27 @@ $(obj)/defkeymap.c: $(obj)/%.c: $(src)/%.map
 	loadkeys --mktable --unicode $< > $@
 
 endif
+
+$(obj)/ucs.o: $(src)/ucs.c $(obj)/ucs_width_table.h $(obj)/ucs_recompose_table.h
+
+# You may uncomment one of those to have the UCS tables be regenerated
+# during the build process. By default the _shipped versions are used.
+#
+#GENERATE_UCS_TABLES := 1
+#GENERATE_UCS_TABLES := 2  # invokes gen_ucs_recompose_table.py with --full
+
+ifdef GENERATE_UCS_TABLES
+
+$(obj)/ucs_width_table.h: $(src)/gen_ucs_width_table.py
+	$(PYTHON3) $< -o $@
+
+ifeq ($(GENERATE_UCS_TABLES),2)
+gen_recomp_arg := --full
+else
+gen_recomp_arg :=
+endif
+
+$(obj)/ucs_recompose_table.h: $(src)/gen_ucs_recompose_table.py
+	$(PYTHON3) $< -o $@ $(gen_recomp_arg)
+
+endif

drivers/tty/vt/gen_ucs_recompose_table.py

@@ -19,8 +19,8 @@ import textwrap
 from pathlib import Path
 this_file = Path(__file__).name
 
-# Output file name
+# Default output file name
-out_file = "ucs_recompose_table.h"
+DEFAULT_OUT_FILE = "ucs_recompose_table.h"
 
 common_recompose_description = "most commonly used Latin, Greek, and Cyrillic recomposition pairs only"
 COMMON_RECOMPOSITION_PAIRS = [
@@ -165,7 +165,7 @@ def validate_common_pairs(full_list):
             print(error_msg)
             raise ValueError(error_msg)
 
-def generate_recomposition_table(use_full_list=False):
+def generate_recomposition_table(use_full_list=False, out_file=DEFAULT_OUT_FILE):
     """Generate the recomposition C table."""
 
     # Collect all recomposition pairs for validation
@@ -250,6 +250,8 @@ if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="Generate Unicode recomposition table")
     parser.add_argument("--full", action="store_true",
                         help="Generate a full recomposition table (default: common pairs only)")
+    parser.add_argument("-o", "--output", dest="output_file", default=DEFAULT_OUT_FILE,
+                        help=f"Output file name (default: {DEFAULT_OUT_FILE})")
     args = parser.parse_args()
 
-    generate_recomposition_table(use_full_list=args.full)
+    generate_recomposition_table(use_full_list=args.full, out_file=args.output_file)

drivers/tty/vt/gen_ucs_width_table.py

@@ -5,13 +5,14 @@
 
 import unicodedata
 import sys
+import argparse
 
 # This script's file name
 from pathlib import Path
 this_file = Path(__file__).name
 
-# Output file name
+# Default output file name
-out_file = "ucs_width_table.h"
+DEFAULT_OUT_FILE = "ucs_width_table.h"
 
 # --- Global Constants for Width Assignments ---
 
@@ -185,13 +186,14 @@ def create_width_tables():
 
     return zero_width_ranges, double_width_ranges
 
-def write_tables(zero_width_ranges, double_width_ranges):
+def write_tables(zero_width_ranges, double_width_ranges, out_file=DEFAULT_OUT_FILE):
     """
     Write the generated tables to C header file.
 
     Args:
         zero_width_ranges: List of (start, end) ranges for zero-width characters
         double_width_ranges: List of (start, end) ranges for double-width characters
+        out_file: Output file name (default: DEFAULT_OUT_FILE)
     """
 
     # Function to split ranges into BMP (16-bit) and non-BMP (above 16-bit)
@@ -286,14 +288,20 @@ static const struct ucs_interval32 ucs_double_width_non_bmp_ranges[] = {
         f.write("};\n")
 
 if __name__ == "__main__":
+    # Parse command line arguments
+    parser = argparse.ArgumentParser(description="Generate Unicode width tables")
+    parser.add_argument("-o", "--output", dest="output_file", default=DEFAULT_OUT_FILE,
+                        help=f"Output file name (default: {DEFAULT_OUT_FILE})")
+    args = parser.parse_args()
+
     # Write tables to header file
     zero_width_ranges, double_width_ranges = create_width_tables()
-    write_tables(zero_width_ranges, double_width_ranges)
+    write_tables(zero_width_ranges, double_width_ranges, out_file=args.output_file)
 
     # Print summary
     zero_width_count = sum(end - start + 1 for start, end in zero_width_ranges)
     double_width_count = sum(end - start + 1 for start, end in double_width_ranges)
-    print(f"Generated {out_file} with:")
+    print(f"Generated {args.output_file} with:")
     print(f"- {len(zero_width_ranges)} zero-width ranges covering ~{zero_width_count} code points")
     print(f"- {len(double_width_ranges)} double-width ranges covering ~{double_width_count} code points")
     print(f"- Unicode Version: {unicodedata.unidata_version}")