import os
import cmd2
import argparse
import sys
# https://www.maizure.org/projects/decoded-gnu-coreutils/
# https://www.maizure.org/projects/decoded-gnu-coreutils/cat.html
from GLXShell.plugins.builtins import PLUGIN_VERSION
from GLXShell.plugins.builtins import PLUGIN_DESCRIPTION
from GLXShell.plugins.builtins import PLUGIN_WARRANTY
cat_parser = argparse.ArgumentParser()
cat_parser.add_argument(
"file",
nargs="*",
type=argparse.FileType("r"),
default=sys.stdin,
help="with no FILE, or when FILE is -, read standard input.",
completer=cmd2.Cmd.path_complete
)
cat_parser.add_argument(
"-A",
"--show-all",
action="store_true",
help="equivalent to -vET",
)
cat_parser.add_argument(
"-b",
"--number-nonblank",
action="store_true",
help="number nonempty output lines, overrides -n",
)
cat_parser.add_argument(
"-e",
action="store_true",
help="equivalent to -vE",
)
cat_parser.add_argument(
"-E",
"--show-ends",
action="store_true",
help="display $ at end of each line",
)
cat_parser.add_argument(
"-n",
"--number",
action="store_true",
help="number all output lines",
)
cat_parser.add_argument(
"-s",
"--squeeze-blank",
action="store_true",
help="suppress repeated empty output lines",
)
# -t equivalent to -vT
cat_parser.add_argument(
"-t",
action="store_true",
help="equivalent to -vT",
)
# -T, --show-tabs display TAB characters as ^I
cat_parser.add_argument(
"-T",
"--show-tabs",
action="store_true",
help="display TAB characters as ^I",
)
# -u (ignored)
cat_parser.add_argument(
"-u",
action="store_true",
help="(ignored)",
)
# -v, --show-nonprinting use ^ and M- notation, except for LFD and TAB
cat_parser.add_argument(
"-v",
"--show-nonprinting",
action="store_true",
help="use ^ and M- notation, except for LFD and TAB",
)
cat_parser.add_argument(
"--version", action="store_true", help="output version information and exit"
)
[docs]class GLXCat(cmd2.CommandSet):
def __init__(self):
super().__init__()
[docs] @staticmethod
def cat_print_version():
cmd2.Cmd().poutput(
"cat ({name}) v{version}\n{licence}".format(
name=PLUGIN_DESCRIPTION,
version=PLUGIN_VERSION,
licence=PLUGIN_WARRANTY,
)
)
[docs] @staticmethod
def cat(file, number_nonblank, number, show_tabs, squeeze_blank, show_ends):
if number_nonblank:
number = False
file_data = []
for file_object in file:
file_data.append(file_object.read().split("\n"))
think_to_display = []
line_number = 1
blank_line_allowed = True
for file in file_data:
if not blank_line_allowed:
blank_line_allowed = True
for line in file:
if show_tabs:
line = line.replace("\t", "^I")
if number:
if len(line) > 0:
think_to_display.append(
"{0:>6d} {1}".format(line_number, line)
)
line_number += 1
if not blank_line_allowed:
blank_line_allowed = True
else:
if blank_line_allowed:
think_to_display.append(
"{0:>6d} {1}".format(line_number, "")
)
line_number += 1
if squeeze_blank and blank_line_allowed:
blank_line_allowed = False
elif number_nonblank:
if len(line) > 0:
think_to_display.append(
"{0:>6d} {1}".format(line_number, line)
)
line_number += 1
if not blank_line_allowed:
blank_line_allowed = True
else:
if blank_line_allowed:
think_to_display.append("")
if squeeze_blank and blank_line_allowed:
blank_line_allowed = False
else:
if len(line) > 0:
think_to_display.append(line)
if not blank_line_allowed:
blank_line_allowed = True
else:
if blank_line_allowed:
think_to_display.append(line)
if squeeze_blank and blank_line_allowed:
blank_line_allowed = False
if show_ends:
last_result = "$\n".join(think_to_display)
else:
last_result = "\n".join(think_to_display)
cmd2.Cmd().last_result = last_result
cmd2.Cmd().poutput(msg=last_result, end="")
[docs] @cmd2.with_argparser(cat_parser)
@cmd2.with_category("Builtins")
def do_cat2(self, args):
"""Concatenate FILE(s) to standard output"""
if args.version: # pragma: no cover
self.cat_print_version()
return
self.cat(
file=args.file,
number_nonblank=args.number_nonblank,
number=args.number,
show_tabs=args.show_tabs,
squeeze_blank=args.squeeze_blank,
show_ends=args.show_ends,
) # pragma: no cover
