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#!/usr/bin/env python
"""A simple example demonstrating the using paged output via the ppaged() method."""
import os
import cmd2
class PagedOutput(cmd2.Cmd):
"""Example cmd2 application which shows how to display output using a pager."""
def __init__(self) -> None:
super().__init__()
def page_file(self, file_path: str, chop: bool = False) -> None:
"""Helper method to prevent having too much duplicated code."""
filename = os.path.expanduser(file_path)
try:
with open(filename) as f:
text = f.read()
self.ppaged(text, chop=chop)
except OSError as ex:
self.pexcept(f'Error reading {filename!r}: {ex}')
@cmd2.with_argument_list
def do_page_wrap(self, args: list[str]) -> None:
"""Read in a text file and display its output in a pager, wrapping long lines if they don't fit.
Usage: page_wrap <file_path>
"""
if not args:
self.perror('page_wrap requires a path to a file as an argument')
return
self.page_file(args[0], chop=False)
complete_page_wrap = cmd2.Cmd.path_complete
@cmd2.with_argument_list
def do_page_truncate(self, args: list[str]) -> None:
"""Read in a text file and display its output in a pager, truncating long lines if they don't fit.
Truncated lines can still be accessed by scrolling to the right using the arrow keys.
Usage: page_chop <file_path>
"""
if not args:
self.perror('page_truncate requires a path to a file as an argument')
return
self.page_file(args[0], chop=True)
complete_page_truncate = cmd2.Cmd.path_complete
if __name__ == '__main__':
import sys
app = PagedOutput()
sys.exit(app.cmdloop())
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