from __future__ import print_function
"""
DSVToPDF.py
Author: Vasudev Ram
Web site: https://vasudevram.github.io
Blog: https://jugad2.blogspot.com
Product store: https://gumroad.com/vasudevram
Twitter: https://mobile.twitter.com/vasudevram
Purpose: Show how to publish DSV data (Delimiter-Separated Values)
to PDF, using the xtopdf toolkit.
Requires:
- ReportLab: https://www.reportlab.com/ftp/reportlab-1.21.1.tar.gz
- xtopdf: https://bitbucket.org/vasudevram/xtopdf
First install ReportLab, then install xtopdf, using instructions here:
http://jugad2.blogspot.in/2012/07/guide-to-installing-and-using-xtopdf.html
The DSV data can be read from either files or standard input.
The delimiter character is configurable by the user and can
be specified as either a character or its ASCII code.
References:
DSV format: https://en.wikipedia.org/wiki/Delimiter-separated_values
TAOUP (The Art Of Unix Programming): Data File Metaformats:
http://www.catb.org/esr/writings/taoup/html/ch05s02.html
ASCII table: http://www.asciitable.com/
"""
import sys
import string
from PDFWriter import PDFWriter
def err_write(message):
sys.stderr.write(message)
def error_exit(message):
err_write(message)
sys.exit(1)
def usage(argv, verbose=False):
usage1 = \
"{}: publish DSV (Delimiter-Separated-Values) data to PDF.\n".format(argv[0])
usage2 = "Usage: python" + \
" {} [ -c delim_char | -n delim_code ] [ dsv_file ] ...\n".format(argv[0])
usage3 = [
"where one of either the -c or -n option must be given,\n",
"delim_char is a single ASCII delimiter character, and\n",
"delim_code is a delimiter character's ASCII code.\n",
"Text lines will be read from specified DSV file(s) or\n",
"from standard input, split on the specified delimiter\n",
"specified by either the -c or -n option, processed, and\n",
"written, formatted, to PDF files with the name dsv_file.pdf.\n",
]
usage4 = "Use the -h or --help option for a more detailed help message.\n"
err_write(usage1)
err_write(usage2)
if verbose:
'''
for line in usage3:
err_write(line)
'''
err_write(''.join(usage3))
if not verbose:
err_write(usage4)
def str_to_int(s):
try:
return int(s)
except ValueError as ve:
error_exit(repr(ve))
def valid_delimiter(delim_code):
return not invalid_delimiter(delim_code)
def invalid_delimiter(delim_code):
# Non-ASCII codes not allowed, i.e. codes outside
# the range 0 to 255.
if delim_code < 0 or delim_code > 255:
return True
# Also, don't allow some specific ASCII codes;
# add more, if it turns out they are needed.
if delim_code in (10, 13):
return True
return False
def dsv_to_pdf(dsv_fil, delim_char, pdf_filename):
with PDFWriter(pdf_filename) as pw:
pw.setFont("Courier", 12)
pw.setHeader(pdf_filename[:-4] + " => " + pdf_filename)
pw.setFooter("Generated by xtopdf: https://google.com/search?q=xtopdf")
for idx, lin in enumerate(dsv_fil):
fields = lin.split(delim_char)
assert len(fields) > 0
# Knock off the newline at the end of the last field,
# since it is the line terminator, not part of the field.
if fields[-1][-1] == '\n':
fields[-1] = fields[-1][:-1]
# Treat a blank line as a line with one field,
# an empty string (that is what split returns).
pw.writeLine(' - '.join(fields))
def main():
# Get and check validity of arguments.
sa = sys.argv
lsa = len(sa)
if lsa == 1:
usage(sa)
sys.exit(0)
elif lsa == 2:
# Allow the help option with any letter case.
if sa[1].lower() in ("-h", "--help"):
usage(sa, verbose=True)
sys.exit(0)
else:
usage(sa)
sys.exit(0)
# If we reach here, lsa is >= 3.
# Check for valid mandatory options (sic).
if not sa[1] in ("-c", "-n"):
usage(sa, verbose=True)
sys.exit(0)
# If -c option given ...
if sa[1] == "-c":
# If next token is not a single character ...
if len(sa[2]) != 1:
error_exit(
"{}: Error: -c option needs a single character after it.".format(sa[0]))
if not sa[2] in string.printable:
error_exit(
"{}: Error: -c option needs a printable ASCII character after it.".format(\
sa[0]))
delim_char = sa[2]
# else if -n option given ...
elif sa[1] == "-n":
delim_code = str_to_int(sa[2])
if invalid_delimiter(delim_code):
error_exit(
"{}: Error: invalid delimiter code {} given for -n option.".format(\
sa[0], delim_code))
delim_char = chr(delim_code)
else:
# Checking for what should not happen ... a bit of defensive programming here.
error_exit("{}: Program error: neither -c nor -n option given.".format(sa[0]))
try:
# If no filenames given, do sys.stdin to PDF ...
if lsa == 3:
print("Converting content of standard input to PDF.")
dsv_fil = sys.stdin
dsv_to_pdf(dsv_fil, delim_char, "dsv_output.pdf")
dsv_fil.close()
print("Output is in dsv_output.pdf")
# else (filenames given), convert them to PDFs ...
else:
for dsv_filename in sa[3:]:
pdf_filename = dsv_filename + ".pdf"
print("Converting file {} to PDF.", dsv_filename)
dsv_fil = open(dsv_filename, 'r')
dsv_to_pdf(dsv_fil, delim_char, pdf_filename)
dsv_fil.close()
print("Output is in {}".format(pdf_filename))
except IOError as ioe:
error_exit("{}: Error: {}".format(sa[0], repr(ioe)))
if __name__ == '__main__':
main()
