V0.33 Add baseline(), fix bug with name check.

FONT_TO_PY.md

@@ -9,9 +9,13 @@ targets: the font file may be incorporated into a firmware build such that it
 occupies flash memory rather than scarce RAM. Python code built into firmware
 is known as frozen bytecode.
 
-## V0.32 notes
+## Recent revisions
 
-21 Sept 2019
+17 Oct 2019 V0.33 With thanks to Stephen Irons (@ironss).
+ 1. Fix bug where input rather than output filename was checked.
+ 2. Add `baseline()` to ouput file returning the maximum descent.
+
+21 Sept 2019 V0.22
 
  1. Reduced output file size for sparse fonts. These result from large gaps
  between ordinal values of Unicode characters not in the standard ASCII set.

font_to_py.py

@@ -312,6 +312,7 @@ class Font(dict):
         self.height = int(max_ascent + max_descent)
         st = 'Height set in {} passes. Actual height {} pixels.\nMax character width {} pixels.'
         print(st.format(npass + 1, self.height, max_width))
+        self._max_ascent = int(max_ascent)
         self._max_descent = int(max_descent)
         return max_width
 
@@ -393,7 +394,7 @@ class Font(dict):
 STR01 = """# Code generated by font_to_py.py.
 # Font: {}{}
 # Cmd: {}
-version = '0.32'
+version = '0.33'
 
 """
 
@@ -478,6 +479,7 @@ def write_data(stream, fnt, font_path, hmap, reverse, iterate, charset):
     cl = ' '.join(sys.argv)
     stream.write(STR01.format(os.path.split(font_path)[1], st, cl))
     write_func(stream, 'height', height)
+    write_func(stream, 'baseline', fnt._max_ascent)
     write_func(stream, 'max_width', fnt.max_width)
     write_func(stream, 'hmap', hmap)
     write_func(stream, 'reverse', reverse)
@@ -598,7 +600,7 @@ if __name__ == "__main__":
                         default = '')
 
     args = parser.parse_args()
-    if not args.infile[0].isalpha():
+    if not args.outfile[0].isalpha():
         quit('Font filenames must be valid Python variable names.')
 
     if not os.path.isfile(args.infile):