Source code for rdfextras.utils.cmdlineutils

import sys
import time
import getopt
import rdflib
import codecs

from rdfextras.utils.pathutils import guess_format

def _help(): 
    sys.stderr.write("""
program.py [-f <format>] [-o <output>] [files...]
Read RDF files given on STDOUT - does something to the resulting graph
If no files are given, read from stdin
-o specifies file for output, if not given stdout is used
-f specifies parser to use, if not given it is guessed from extension

""")
    

[docs]def main(target, _help=_help, options="", stdin=True): """ A main function for tools that read RDF from files given on commandline or from STDIN (if stdin parameter is true) """ args, files=getopt.getopt(sys.argv[1:], "hf:o:"+options) dargs=dict(args) if "-h" in dargs: _help() sys.exit(-1) g=rdflib.Graph() if "-f" in dargs: f=dargs["-f"] else: f=None if "-o" in dargs: sys.stderr.write("Output to %s\n"%dargs["-o"]) out=codecs.open(dargs["-o"], "w","utf-8") else: out=sys.stdout start=time.time() if len(files)==0 and stdin: sys.stderr.write("Reading from stdin as %s..."%f) g.load(sys.stdin, format=f) sys.stderr.write("[done]\n") else: size=0 for x in files: if f==None: f=guess_format(x) start1=time.time() sys.stderr.write("Loading %s as %s... "%(x,f)) g.load(x, format=f) sys.stderr.write("done.\t(%d triples\t%.2f seconds)\n"%(len(g)-size, time.time()-start1)) size=len(g) sys.stderr.write("Loaded a total of %d triples in %.2f seconds.\n"%(len(g), time.time()-start)) target(g,out,args)