Hello. Prompted by fosskers/aura#10 <fosskers/aura#10>, I did a quick analysis of behavior of \b and \r in various terminals.
Long story short, @fosskers <https://github.com/fosskers>, author of aura_, an AUR helper (and don’t forget I am a developer of one, too!) is using \b and \r in his code for doing magic like displaying progress messages in a row. Aura is written in Haskell, but I do not speak Haskell, so I used Python.
| # A fancy way to test if a number is prime in Python. | |
| # Copyright © 2013, Kwpolska. Free for any use if this clause is reproduced. | |
| def prime(n): | |
| for i in range(2, n): | |
| t = float(n) / float(i) # if you need debug, just print t | |
| if (t % 1) == 0: | |
| return False | |
| return True |
| In [7]: lxml.html.fromstring(text).xpath("//*[@class='box']//form/input") | |
| --------------------------------------------------------------------------- | |
| ValueError Traceback (most recent call last) | |
| <ipython-input-7-0792823b10b8> in <module>() | |
| ----> 1 lxml.html.fromstring(text).xpath("//*[@class='box']//form/input") | |
| /usr/lib/python3.3/site-packages/lxml/html/__init__.py in fromstring(html, base_url, parser, **kw) | |
| 663 return document_fromstring(html, parser=parser, base_url=base_url, **kw) | |
| 664 # otherwise, lets parse it out... | |
| --> 665 doc = document_fromstring(html, parser=parser, base_url=base_url, **kw) |
| $ python2 -c 'print("python", "2")'; python3 -c 'print("python", "3")' | |
| ('python', '2') | |
| python 3 | |
| $ python2 -c 'from __future__ import print_function; print("python", "2")' | |
| python 2 |
| #include <stdlib.h> | |
| #include <stdio.h> | |
| int print_error(int errorcode) { | |
| FILE *fp; | |
| char cmd[100]; | |
| char out[1000]; | |
| sprintf(cmd, "NET HELPMSG %d'", errorcode); | |
| fp = popen(cmd, "r"); |
| import pygments.formatters | |
| import pygments.styles | |
| def get_pygments_css(pygments_style): | |
| """Get the CSS for a Pygments style.""" | |
| return pygments.formatters.HtmlFormatter(style=pygments.styles.get_style_by_name(pygments_style)).get_style_defs('.code') |