playing with python3

2 files changed, 74 insertions, 27 deletions

diff --git a/font/Makefile b/font/Makefile
index f758bfd..2eeaf37 100644
--- a/font/Makefile
+++ b/font/Makefile
@@ -1,5 +1,5 @@
 ############ fool-font ############
 binfont.bin: binfont.src
-	python binarize.py $< $@
+	python3.2 binarize.py $< $@
 clean:
 	-rm binfont.bin
diff --git a/font/binarize.py b/font/binarize.py
index 6dcbdef..1abb9d6 100644
--- a/font/binarize.py
+++ b/font/binarize.py
@@ -1,40 +1,87 @@
-# this is a simple script to convert the ascii files into binaries
-# everything but 0 an 1 , or alternatively _ and X is ignored in 
-# source file.
-
-import binascii 
 import sys
 
+def binarize(file_in, file_out):
+
+    """ Create a binary file from an ASCII file. Everything 
+        but '0' and '1' (alternatively '_' and 'X') is ignored 
+        from the input file. """
+
+    print ("binarizing " + file_in + " to "+ file_out + ".")
+    
+    try:
+
+        f=open(file_in,'r')
+
+        try:
+
+            o=open(file_out,'wb')
+
+            try:
+
+                while True:
+
+                    b=readnext(f)
+                    if b==-1:
+                        break
+
+                    o.write(bytes([b]))
+
+            except IOError:
+                print("IOError happened during processing.");
+                print("I am closing the input and ouput files and aborting.");
+                print("Warning: The output file is very likely incomplete.");
+
+            o.close()
+
+        except IOError:
+            print("IOError opening output file: " + file_out);
+
+        f.close()
+
+    except IOError:
+        print("IOError opening input file: " + file_in);
+
+
+def readnext(f):
+
+    """ Read next 'byte' from the given ASCII file (BufferedWriter)
+        everything but '_','X','0','1' is ignored. 
+        Returns the byte as integer or -1 on EOF """
+
+    l=0 
+    b=""
+
+    while l<8:
+
+        c=f.read(1)
+
+        if not c:
+            return -1
 
-f=open(sys.argv[1],'r')
-o=open(sys.argv[2],'wb')
+        if c=="0" or c=='_':
+            l+=1
+            b+="0"
 
-print "binarizing " + sys.argv[1] + " to "+sys.argv[2] + "."
+        if c=="1" or c=='X':
+            l+=1
+            b+="1"
 
-b=""
-l=0
+    return  int(b,2)
 
-while True:
+def usage():
 
-    c=f.read(1)
+    """ Prints usage information to sdtout """
 
-    if not c:
-	break
+    print ("python3.x binarize.py [file_in] [file_out]")
 
-    if c=="0" or c=='_':
-	l+=1
-	b+="0"
 
-    if c=="1" or c=='X':
-	l+=1
-	b+="1"
 
-    if l==8:
-#	print b
-	l=0
-	o.write(chr(int(b,2)))
-	b=""
+""" direct use """
 
-o.close()
+if __name__ == "__main__":
 
+    if(len(sys.argv)==3):
+        binarize(sys.argv[1],sys.argv[2])
+    else:
+        usage()