# Idea borrowed from Brian Akey - www.ironkeytech.com/pyshell # Adapted for Windoze by Fuzzyman # April 2004 # http://www.voidspace.org.uk/atlantibots/pythonutils.html import os, sys, os.path import traceback from StringIO import StringIO from traceback import print_exc def findlocals(line): """If a local variable is to be referenced with a system command the variable will be escaped with a $. This function replaces the variable with it's value. The $ character can be escaped anywhere with a \ that will be removed. (a literal '\$' then becomes '\\$') """ lpos = line.find(' ') if lpos == -1: return line # if there's no space (no command) then it's not a variable name command = line[:lpos] params = line[lpos:].strip() escapelist = ['$'] # currently just the $ character variable = '' varon = 0 newparams = '' skip = 0 params += ' ' # so that a variable at the end of a line is terminated for char in params: if skip: # was the last characetr a '\' if char in escapelist: # if the '\' is followed by a '$' it's not a variable - so jsut move on newparams += char else: newparams += '\\' + char skip = 0 continue if char == '\\': # is this an escape character ? skip = 1 continue if varon: # are we in the process of replacing a variable name if char == ' ' or char == '\"': # is this the end of the name ? if globals().has_key(variable): newparams += str(globals()[variable]) + ' ' # str or repr ?? else: print 'No such variable as ' + variable return varon = 0 variable = '' else: variable += char continue if char == '$': # have we found the start of a variable name ? varon = 1 continue newparams += char newline = command + ' ' + newparams # rebuild the command line return newline def chdir(l1): """A simple function to change the directory. Including handling spaces, quotes etc.""" l2 = l1 if l1 == '\"' == l1[-1]: l2 = l1[1:-1] if os.path.isdir(l2): os.chdir(l2) elif os.path.isdir(l2.strip()): os.chdir(l2.strip()) else: print 'The system can\'t see directory ' + l1 hist =  l1 = '' pt = ' >>> ' quitcom = ['exit', 'x', 'q', 'quit'] credits = """Pyshell for windoze by Fuzzyman. See http://www.voidspace.org.uk/atlantibots/pythonutils.html""" print "Welcome to Pyshell for Windoze." while l1 not in quitcom: try : l1 = raw_input(os.getcwd() + pt) l1 = l1.strip() # note - we lose indentation here... bad if we want to implement functions etc... if l1.find('$') != -1: l1 = findlocals(l1) # put in any variables if not l1: continue l1 = l1.strip() # same here hist += [l1] if l1 == '!': os.system(l1[1:]) elif l1 == 'ls': os.system('dir') elif l1 == '?': print credits elif l1.startswith('ls '): os.system('dir ' + l1[3:]) elif l1.startswith('dir ') or l1 == 'dir': os.system(l1) elif l1.startswith('echo '): os.system(l1) elif l1 == 'hist': del hist[len(hist)-1] for h1 in hist: print h1 elif l1.startswith('cd '): l1 = l1[3:] chdir(l1) elif l1 == '/' or l1 == '\\': chdir(l1[1:]) elif l1 == '..': os.chdir(l1) else: try: exec(l1) except: os.system(l1) except (KeyboardInterrupt, EOFError) : ## ctrl-z or ctrl-c hit break except Exception, e: f = StringIO() print_exc(file=f) a = f.getvalue().splitlines() for line in a: print line """ USAGE For use on windows systems. Double click shell.py and it will bring up a console window. Any of the following commands to exit - 'exit', 'x', 'q', 'quit', ctr-c '?' brings up a simple credits line. You can define python variables or expressions - not currently functions - in the usual way. You can enter system commands in the ususal way. The command line is first tried as a python command, if it raises an excpetion it is then tried as a system command. Single line loops are possible e.g. F:\Python Projects\shell >>> for value in [1,2,3,4,5] : print value 1 2 3 4 5 F:\Python Projects\shell >>> You can insert a python variable (or the string representation of any python object) into a system command by using $name. e.g. F:\Python Projects\shell >>> ls Volume in drive F is Other Drive Volume Serial Number is 2446-9C27 Directory of F:\Python Projects\shell 22/04/2004 23:41 <DIR> . 22/04/2004 23:41 <DIR> .. 22/04/2004 23:41 42 filelist.txt 21/04/2004 19:52 <DIR> modules 21/04/2004 20:01 4,450 newshell.py 21/04/2004 14:57 3,347 shell.py 21/04/2004 14:27 109 TODO.txt 4 File(s) 7,948 bytes 3 Dir(s) 116,625,092,608 bytes free F:\Python Projects\shell >>> source = open('filelist.txt', 'r').readlines() F:\Python Projects\shell >>> for file in source:print file.strip() TODO1.txt TODO2.txt TODO3.txt TODO4.txt F:\Python Projects\shell >>> filename = source.strip() F:\Python Projects\shell >>> echo $filename TODO1.txt F:\Python Projects\shell >>> Any exceptions are displayed (but non-fatal). EXTRA COMMANDS If a line starts with a '!' it is always sent to the system. (Useful if a system command clashes with a valid python name). 'ls' is an aliase for 'dir' lines starting 'echo' are always a system command 'hist' print the current command history lines starting '/' are passed straight to cd (minus the leading '/') '..' is an alias for 'cd ..' Because we are using the os.system command to launch system commands - typing a command like 'help.html' (or any other valid file) - launches the file with the program the system uses to view that file. In this case it would launch the file 'help.html' with the system browser. Can use the import command to run python programs in our namespace. ISSUES lowercase - In windoze commands aren't case sensitive - the system commands I've defined are. No help function Can't yet put a system command as part of a loop. (or a python function as the parameters to a system command) No functions, classes or conditionals. Can only access 'standard' variables through the '$' operator - not lists or dictionaries. """