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138 lines
3.5 KiB
Python
Executable file
138 lines
3.5 KiB
Python
Executable file
#! /usr/bin/env python
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# Emulate some Perl command line options.
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# Usage: pp [-a] [-c] [-d] [-e scriptline] [-F fieldsep] [-n] [-p] [file] ...
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# Where the options mean the following:
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# -a : together with -n or -p, splits each line into list F
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# -c : check syntax only, do not execute any code
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# -d : run the script under the debugger, pdb
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# -e scriptline : gives one line of the Python script; may be repeated
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# -F fieldsep : sets the field separator for the -a option [not in Perl]
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# -n : runs the script for each line of input
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# -p : prints the line after the script has run
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# When no script lines have been passed, the first file argument
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# contains the script. With -n or -p, the remaining arguments are
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# read as input to the script, line by line. If a file is '-'
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# or missing, standard input is read.
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# XXX To do:
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# - add -i extension option (change files in place)
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# - make a single loop over the files and lines (changes effect of 'break')?
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# - add an option to specify the record separator
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# - except for -n/-p, run directly from the file if at all possible
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import sys
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import string
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import getopt
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FS = ''
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SCRIPT = []
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AFLAG = 0
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CFLAG = 0
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DFLAG = 0
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NFLAG = 0
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PFLAG = 0
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try:
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optlist, ARGS = getopt.getopt(sys.argv[1:], 'acde:F:np')
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except getopt.error, msg:
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sys.stderr.write(sys.argv[0] + ': ' + msg + '\n')
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sys.exit(2)
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for option, optarg in optlist:
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if option == '-a':
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AFLAG = 1
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elif option == '-c':
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CFLAG = 1
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elif option == '-d':
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DFLAG = 1
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elif option == '-e':
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for line in string.splitfields(optarg, '\n'):
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SCRIPT.append(line)
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elif option == '-F':
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FS = optarg
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elif option == '-n':
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NFLAG = 1
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PFLAG = 0
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elif option == '-p':
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NFLAG = 1
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PFLAG = 1
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else:
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print option, 'not recognized???'
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if not ARGS: ARGS.append('-')
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if not SCRIPT:
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if ARGS[0] == '-':
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fp = sys.stdin
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else:
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fp = open(ARGS[0], 'r')
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while 1:
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line = fp.readline()
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if not line: break
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SCRIPT.append(line[:-1])
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del fp
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del ARGS[0]
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if not ARGS: ARGS.append('-')
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if CFLAG:
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prologue = ['if 0:']
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epilogue = []
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elif NFLAG:
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# Note that it is on purpose that AFLAG and PFLAG are
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# tested dynamically each time through the loop
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prologue = [ \
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'LINECOUNT = 0', \
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'for FILE in ARGS:', \
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' \tif FILE == \'-\':', \
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' \t \tFP = sys.stdin', \
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' \telse:', \
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' \t \tFP = open(FILE, \'r\')', \
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' \tLINENO = 0', \
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' \twhile 1:', \
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' \t \tLINE = FP.readline()', \
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' \t \tif not LINE: break', \
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' \t \tLINENO = LINENO + 1', \
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' \t \tLINECOUNT = LINECOUNT + 1', \
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' \t \tL = LINE[:-1]', \
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' \t \taflag = AFLAG', \
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' \t \tif aflag:', \
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' \t \t \tif FS: F = string.splitfields(L, FS)', \
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' \t \t \telse: F = string.split(L)' \
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]
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epilogue = [ \
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' \t \tif not PFLAG: continue', \
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' \t \tif aflag:', \
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' \t \t \tif FS: print string.joinfields(F, FS)', \
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' \t \t \telse: print string.join(F)', \
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' \t \telse: print L', \
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]
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else:
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prologue = ['if 1:']
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epilogue = []
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# Note that we indent using tabs only, so that any indentation style
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# used in 'command' will come out right after re-indentation.
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program = string.joinfields(prologue, '\n') + '\n'
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for line in SCRIPT:
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program = program + (' \t \t' + line + '\n')
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program = program + (string.joinfields(epilogue, '\n') + '\n')
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import tempfile
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tfn = tempfile.mktemp()
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try:
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fp = open(tfn, 'w')
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fp.write(program)
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fp.close()
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if DFLAG:
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import pdb
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pdb.run('execfile(' + `tfn` + ')')
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else:
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execfile(tfn)
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finally:
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import os
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try:
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os.unlink(tfn)
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except:
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pass
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