only touch lichess.sfd when changed

bin/gen/licon.py

@@ -83,7 +83,7 @@ def main():
 
     gen_fonts()
 
-    codes = parse_codes()
+    codes = read_write_codes()
 
     gen_sources(codes)
 
@@ -110,32 +110,33 @@ def dash_camel(s):
     return ''.join([w.title() for w in s.split('-')])
 
 
-def parse_codes():
+def read_write_codes():
     unnamed_re = re.compile(r'$|uni[a-f0-9]{4}', re.IGNORECASE)
     codes = {}
     warnings = []
     corrected = []
+    lines = []
     with open('lichess.sfd', 'r') as f:
         lines = f.readlines()
         name = None
         n = 0
-        line_ok = True
         for line in lines:
             if line.startswith('StartChar:'):
                 name = dash_camel(line.split(': ')[1].strip())
             elif line.startswith('Encoding:') and name is not None:
                 code_point = int(line.split(' ')[1])
                 if code_point >= 0xe000 and code_point <= 0xefff:
-                    code_point = 57344 + n
                     n += 1
+                    code_point = 57343 + n
                     line = f'Encoding: {code_point} {code_point} {n}\n'
                     if unnamed_re.match(name):
                         warnings.append(f'  Unnamed glyph "{name}" at code point {code_point}\n')
                     else:
                         codes[name] = code_point
             corrected.append(line)
-    with open('lichess.sfd', 'w') as f:
-        f.write(''.join(corrected))
+    if corrected != lines:
+        with open('lichess.sfd', 'w') as f:
+            f.write(''.join(corrected))
     print('' if not warnings else f'\nWarnings:\n{"".join(warnings)}')
     return dict(sorted(codes.items(), key=lambda x: x[1]))