+- Python Forum (https://python-forum.io)
+-- Forum: General (https://python-forum.io/forum-1.html)
+--- Forum: News and Discussions (https://python-forum.io/forum-31.html)
+--- Thread: does anyon want to write an untabify command? (/thread-20889.html)
Pages:
1
2
does anyon want to write an untabify command? - Skaperen - Sep-04-2019
i know Linux has a command called "expand" intended to remove tabs. but it doesn't work right. when you run it with a file name, it just outputs the file, without tabs, to stdout, instead of replacing the file (and leaving a backup). and i have no idea what is on Windows or Mac OSX. a pip search comes up empty. does someone want to do this or does everyone want me to do it?
RE: does anyon want to write an untabify command? - wavic - Sep-05-2019
How about sed?
RE: does anyon want to write an untabify command? - Skaperen - Sep-06-2019
why sed?
RE: does anyon want to write an untabify command? - wavic - Sep-06-2019
Because it's made just for this.
RE: does anyon want to write an untabify command? - Skaperen - Sep-06-2019
sed is made for editing. i see nothing in its man page about tabs.
RE: does anyon want to write an untabify command? - buran - Sep-06-2019
(Sep-06-2019, 08:21 PM)Skaperen Wrote: sed is made for editing. i see nothing in its man page about tabs.
https://linuxconfig.org/replace-all-tab-characters-with-spaces
RE: does anyon want to write an untabify command? - Skaperen - Sep-06-2019
a tab does not mean a fixed amount of spacing from where it is, instead, it means whatever amount of spacing to get to the fixed position of the next tab stop. i know of no way that "sed" can do this. the "expand" command does this correctly, but cannot update a file in place.
RE: does anyon want to write an untabify command? - snippsat - Sep-08-2019
(Sep-06-2019, 10:35 PM)Skaperen Wrote: a tab does not mean a fixed amount of spacing from where it is, instead, it means whatever amount of spacing to get to the fixed position of the next tab stop.Yes it's more diabolical,and a little more difficult to write.
Why do you not try yourself?
As i started look into this,i did write some code that can do both tab to space or even space.
For in place change of file in-place,and i did use Click to make it a command line tool(no decorator question now)
If you want to use some code can take functions out they work stand alone.
# tab.py
import click
import re
import in_place
@click.group()
def cli():
"""
\b
tab-space: Tab to space replace like Linux <expand> command
Usage: tab-space --tabs 4 file_1.txt
---
tab-even: Tab to equal spacing between text content
Usage: tab-even --space 4 file_1.txt
"""
pass
def tab__space(text, tabs=8):
result = ''
for c in text:
if c == '\t':
result += ' '
while len(result) % tabs != 0:
result += ' '
else:
result += c
return result
@cli.command()
@click.option('-t', '--tabs', default=8, help='Number of spaces')
@click.argument('file', type=click.Path(exists=True))
def tab_space(file, tabs=8):
with in_place.InPlace(file) as f_out:
for line in f_out:
line = tab__space(line, tabs)
f_out.write(line)
@cli.command()
@click.option('-s', '--space', default=4, help='Number of spaces')
@click.argument('file', type=click.Path(exists=True))
def tab_even(file, space=4):
with in_place.InPlace(file) as f:
text = f.read()
result = re.sub(r'\s\s+|\t', ' '*space, text)
click.echo(result)
f.write(result)
if __name__ == '__main__':
cli()Usage:Output:λ tab --help
Usage: tab [OPTIONS] COMMAND [ARGS]...
tab-space: Tab to space replace like Linux <expand> command
Usage: tab-space --tabs 4 file_1.txt
---
tab-even: Tab to equal spacing between text content
Usage: tab-even --space 4 file_1.txt
Options:
--help Show this message and exit.
Commands:
tab-even
tab-space
# tab dos not give even space between words
λ tab tab-space --tabs 4 file_1.txt
One Two Three Four Five six seven
One Two Three Four Five six seven
One Two Three Four Five six seven
λ tab tab-even --space 4 file_1.txt
One Two Three Four Five six seven
One Two Three Four Five six seven
One Two Three Four Five six sevenRE: does anyon want to write an untabify command? - Skaperen - Sep-08-2019
i was expecting some existing function that just does it.
i like that in_place module. too bad i can't assume every python installation has it. and i wish they would quit naming things with CamelCase.
RE: does anyon want to write an untabify command? - snippsat - Sep-09-2019
(Sep-08-2019, 06:17 PM)Skaperen Wrote: i was expecting some existing function that just does it.Yes with your none exciting effort,you should except that
Skaperen Wrote:i like that in_place module. too bad i can't assume every python installation has it. and i wish they would quit naming things with CamelCase.There is a option in standard library fileinput with
inplace=True,but it not so nice to use,in-place module dos it better and are simpler to use.As mention all code is there,here taken out.
import re
import in_place
def tab_space(text, tabs=8):
result = ''
for c in text:
if c == '\t':
result += ' '
while len(result) % tabs != 0:
result += ' '
else:
result += c
return result
def tab_even(file, space=4):
with in_place.InPlace(file) as f:
text = f.read()
result = re.sub(r'\s\s+|\t', ' '*space, text)
f.write(result)
if __name__ == '__main__':
#--- Tab space ---#
file = 'file_1.txt'
tabs = 4
with in_place.InPlace(file) as f_out:
for line in f_out:
line = tab_space(line, tabs)
f_out.write(line)
#--- Even Space ---#
#file = 'file_1.txt'
#tab_even(file, space=8)Test file file_1.txt.Output:One Two Three Four Five six seven
One Two Three Four Five six seven
One Two Three Four Five six seven