Blog Rss FeedIn that code, I was using a package called fortune developed by Brian M. Clapper. The problem is that this package does not allow you to use the existing fortunes files provided by your operating system. The .dat file used by that package are not compatible with the .dat file of your operating system. Also the actual version of the package contains a bug and the creation of the .dat file doesn't work. That's why I developed the following get_fortune() function, which can use the operating system's fortunes files.
If you want to create your own fortune file you just need to update or create the .dat file using the standard command strfile <fortunesfile>. The default separator between each fortune is the character '%'.
Example for the creation of a new fortune file
$ vi myfortunes When things are going well, someone will inevitably experiment detrimentally. % If not controlled, work will flow to the competent man until he submerges.
$ strfile myfortunes "myfortunes.dat" created There were 2 strings Longest string: 78 bytes Shortest string: 76 bytes $
The new version of twfortune uses the following function. twfortune can be downloaded from twfortune.tar.gz
Source code for get_fortune()
# fortune.py -- chooses a random fortune, as the fortune(8) program in # the BSD-games package does import struct, random def get_fortune(filename): """Select a random quotation read the .dat file, select a random quote Here is the c structure found in NetBSD packages describing the .dat file. typedef struct { /* information table */ #define VERSION 1 u_int32_t str_version; /* version number */ u_int32_t str_numstr; /* # of strings in the file */ u_int32_t str_longlen; /* length of longest string */ u_int32_t str_shortlen; /* length of shortest string */ #define STR_RANDOM 0x1 /* randomized pointers */ #define STR_ORDERED 0x2 /* ordered pointers */ #define STR_ROTATED 0x4 /* rot-13'd text */ u_int32_t str_flags; /* bit field for flags */ unsigned char stuff[4]; /* long aligned space */ #define str_delim stuff[0]/* delimiting character */ } STRFILE; This structure is written at the begenning of the .dat and follows the list of offset positions for each new string. """ # On all OSs that I use, the type off_t is a long long. # Some OSs use a long for off_t. You should change OFFT_SIZE to reflect # the size of the file offsets used by your operating system. # The struct elemnts should be changed from q to L. OFFT_SIZE = struct.calcsize('q') datfile = open(filename+'.dat', 'r') # strfile structure description (5 long, followed by 4 chars) strfile_desc = '!5l4s' # read the structur length at the begining of the file data = datfile.read(struct.calcsize(strfile_desc)) version, numstr, longlen, shortlen, flags, stuff = \ struct.unpack(strfile_desc, data) delimiter = stuff[0] # pick a random number and seek to the choosen pointer. r = random.randint(0, numstr) datfile.seek(OFFT_SIZE * r, 1) data = datfile.read(OFFT_SIZE * 2) start, end = struct.unpack('!qq', data) datfile.close() file = open(filename, 'r') file.seek(start) fortune = file.read(end-start) file.close() # cleanup the end of the fortune lines = fortune.split('\n') while lines[-1].strip() == delimiter or lines[-1].strip() == "": lines=lines[:-1] return '\n'.join(lines) if __name__ == '__main__': import sys, os.path if len(sys.argv) == 1: print 'Usage: %s <filename>' % os.path.basename(__file__) sys.exit() print get_fortune(sys.argv[1])
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