Title:           [Python] Filename sanitizer snippet 1
Author:          waterapple
Pastebin link:   http://pastebin.com/PGA4jA8w
First Edit:      Thursday 23rd of August 2012 07:04:10 PM CDT
Last Edit:       Thursday 23rd of August 2012 07:04:10 PM CDT

def sanitizefilename(unsanitizedfn,debug=False):
        #make safe for a filename
        if debug:
                print unsanitizedfn
        #remove disallowed characters
        filenamesubbed = re.sub('[^A-Za-z0-9 \.]+', '-', unsanitizedfn)
        if debug:
                print filenamesubbed
        #remove duplicate underscores and spaces
        filenamesubbed = re.sub("_+", "_", filenamesubbed)
        if debug:
                print filenamesubbed
        #make sure first and last char arent spacees
        filenametrim = filenamesubbed
        while True:
                if debug:
                        print filenametrim
                #remove last char if its a space
                if filenametrim[-1] == ' ':
                        filenametrim = filenametrim[:-1]
                #remove first char if its a space
                if filenametrim[0] == ' ':
                        filenametrim = filenametrim[1:]
                #if first and last chars arent spaces, continue
                if filenametrim[0] != ' ' and filenametrim[-1] != ' ':
                        fnout = filenametrim
                c += 1#increment counter
                if c >= 100:#if we fucked up, ignote trimming
                        fnout = filenamesubbed
        return fnout