From 077ee3d109d317ef4e0b8b15b7c7fc4940df4842 Mon Sep 17 00:00:00 2001
From: d_m <d_m@plastic-idolatry.com>
Date: Fri, 13 Sep 2024 13:44:31 -0400
Subject: [PATCH] unifont tool for uf2

---
 unihex2uf2 | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100755 unihex2uf2

diff --git a/unihex2uf2 b/unihex2uf2
new file mode 100755
index 0000000..6592105
--- /dev/null
+++ b/unihex2uf2
@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+
+import os
+import re
+import sys
+
+line_re = re.compile(r'^([0-9A-Fa-f]{4}):((?:[0-9A-Fa-f]{32}){1,2})$')
+def parse(line):
+    m = line_re.match(line)
+    if not m:
+        raise Exception('could not parse line: %r' % line)
+    n = int(m.group(1), 16)
+    data = m.group(2)
+    return (n, data)
+
+blank_line = ' '.join(['00'] * 16)
+
+def split16(data):
+    return ' '.join([data[i:i+2] for i in range(0, 32, 2)])
+
+def split(data):
+    if len(data) == 32:
+        return (split16(data),)
+    elif len(data) == 64:
+        return (split16(data[0:32]), split16(data[32:64]))
+    else:
+        raise Exception('invalid data length: %d' % len(data))
+
+def run(path, start):
+    limit = start + 256
+    widths = [8] * 256
+    lines = []
+
+    def emit(n, line1, line2):
+        lines.append(('( %04x ) ' % n) + line1)
+        lines.append('         ' + line2)
+
+    with open(path, 'r') as f:
+        seeking = start
+        for line in f:
+            n, data = parse(line.lower())
+            if n < seeking:
+                continue
+            if n > seeking:
+                for i in range(seeking, min(limit, seeking)):
+                    emit(i, blank_line, blank_line)
+            if n >= limit:
+                break
+            tpl = split(data)
+            if len(tpl) == 1:
+                emit(n, tpl[0], blank_line)
+                widths[n - start] = 8
+            else:
+                emit(n, tpl[0], tpl[1])
+                widths[n - start] = 16
+            seeking = n + 1
+        for i in range(seeking, limit):
+            emit(i, blank_line, blank_line)
+
+    print('( unifont: %04x to %04x )' % (start, limit - 1))
+    print('')
+    print('( widths )')
+    for i in range(16):
+        j = i * 16
+        width_line = ' '.join([('%02x' % widths[k]) for k in range(j, j + 16)])
+        print(('( %04x ) ' % j) + width_line)
+    print('')
+    print('( font data, 2x2 tiles )')
+    for line in lines:
+        print(line)
+
+def usage(message=None):
+    if message:
+        print('ERROR: %s' % message)
+        print('')
+    print('USAGE: %s PATH START' % sys.argv[0])
+    print('')
+    print('  PATH is a hex file, e.g. /usr/share/unifont/unifont.hex')
+    print('  START is a code point in hex, e.g. 0, 3c0, 7f00, etc.')
+    print('')
+    print('  each .uf2 file contains 256 characters, so the output')
+    print('  will contains widths and data for all characters from')
+    print('  START to START+255 (inclusive).')
+    print('')
+    sys.exit(1)
+
+def main():
+    args = sys.argv[1:]
+    if len(args) != 2:
+        return usage()
+    path, start = args
+    if not os.path.exists(path):
+        return usage('could not read .hex file: %s' % path)
+
+    try:
+        n = int(start, 16)
+    except:
+        return usage('could not parse start character: %s' % start)
+
+    if n < 0:
+        return usage('start must be >= 0: %s' % start)
+    if n > 65280:
+        return usage('start must be <= ff00: %s' % start)
+
+    run(path, n)
+
+if __name__ == "__main__":
+    main()