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Why are newlines added to the help under python click

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0

I'm using the Click Python library to parse the command line arguments.

Here's a snippet of my code:

@click.group(invoke_without_command=True)
@click.option('--opt', default=1, help='Flag for if we want success or failuren0 = failuren1 = success')
@click.pass_context

When I run my program, for some reason, there's an extra newline between the hyphen and the word "success". Can anyone tell me why there's a newline added? I didn't add a newline there. The new line is after both of the words "failure", which is correct. However, there should be one after the word success, but for some reason, it comes before the word success.

$ ./get_last_successful_build.py --help
Usage: get_last_successful_build.py [OPTIONS] COMMAND [ARGS]...

Options:
 --opt INTEGER Flag for if we want success or failure
 0 - failure
 1 -
 success
 --help Show this message and exit.

python

share|improve this question

edited Mar 28 at 2:21

Chris

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asked Mar 28 at 1:54

ClassifiedClassified

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add a comment | 

0

I'm using the Click Python library to parse the command line arguments.

Here's a snippet of my code:

@click.group(invoke_without_command=True)
@click.option('--opt', default=1, help='Flag for if we want success or failuren0 = failuren1 = success')
@click.pass_context

When I run my program, for some reason, there's an extra newline between the hyphen and the word "success". Can anyone tell me why there's a newline added? I didn't add a newline there. The new line is after both of the words "failure", which is correct. However, there should be one after the word success, but for some reason, it comes before the word success.

$ ./get_last_successful_build.py --help
Usage: get_last_successful_build.py [OPTIONS] COMMAND [ARGS]...

Options:
 --opt INTEGER Flag for if we want success or failure
 0 - failure
 1 -
 success
 --help Show this message and exit.

python

share|improve this question

edited Mar 28 at 2:21

Chris

65.4k1818 gold badges134134 silver badges130130 bronze badges

asked Mar 28 at 1:54

ClassifiedClassified

2,2921313 gold badges4848 silver badges7575 bronze badges

add a comment | 

I'm using the Click Python library to parse the command line arguments.

Here's a snippet of my code:

@click.group(invoke_without_command=True)
@click.option('--opt', default=1, help='Flag for if we want success or failuren0 = failuren1 = success')
@click.pass_context

When I run my program, for some reason, there's an extra newline between the hyphen and the word "success". Can anyone tell me why there's a newline added? I didn't add a newline there. The new line is after both of the words "failure", which is correct. However, there should be one after the word success, but for some reason, it comes before the word success.

$ ./get_last_successful_build.py --help
Usage: get_last_successful_build.py [OPTIONS] COMMAND [ARGS]...

Options:
 --opt INTEGER Flag for if we want success or failure
 0 - failure
 1 -
 success
 --help Show this message and exit.

python

share|improve this question

edited Mar 28 at 2:21

Chris

65.4k1818 gold badges134134 silver badges130130 bronze badges

asked Mar 28 at 1:54

ClassifiedClassified

2,2921313 gold badges4848 silver badges7575 bronze badges

@click.group(invoke_without_command=True)
@click.option('--opt', default=1, help='Flag for if we want success or failuren0 = failuren1 = success')
@click.pass_context

$ ./get_last_successful_build.py --help
Usage: get_last_successful_build.py [OPTIONS] COMMAND [ARGS]...

Options:
 --opt INTEGER Flag for if we want success or failure
 0 - failure
 1 -
 success
 --help Show this message and exit.

share|improve this question

edited Mar 28 at 2:21

Chris

65.4k1818 gold badges134134 silver badges130130 bronze badges

asked Mar 28 at 1:54

ClassifiedClassified

2,2921313 gold badges4848 silver badges7575 bronze badges

share|improve this question

edited Mar 28 at 2:21

Chris

65.4k1818 gold badges134134 silver badges130130 bronze badges

asked Mar 28 at 1:54

ClassifiedClassified

2,2921313 gold badges4848 silver badges7575 bronze badges

edited Mar 28 at 2:21

Chris

65.4k1818 gold badges134134 silver badges130130 bronze badges

edited Mar 28 at 2:21

Chris

65.4k1818 gold badges134134 silver badges130130 bronze badges

asked Mar 28 at 1:54

ClassifiedClassified

2,2921313 gold badges4848 silver badges7575 bronze badges

asked Mar 28 at 1:54

ClassifiedClassified

2,2921313 gold badges4848 silver badges7575 bronze badges

1 Answer
1

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oldest

votes

2

I think Click is wrapping your paragraph based on the width of the terminal but not factoring in newlines:

The default behavior of Click is to rewrap text based on the width of the terminal. In some circumstances, this can become a problem. The main issue is when showing code examples, where newlines are significant.

If you take the whole help string, with the padding that Click itself adds, and remove all newlines, the word success ends at character position 81:

 --opt INTEGER Flag for if we want success or failure 0 - failure 1 - success
123456789012345678901234567890123456789012345678901234567890123456789012345678901
 1 2 3 4 5 6 7 8

If the newlines themselves are included in its calculation that brings us to 83. I'm not sure how wide your terminal is, but 80 columns is a common width.

See if you can override this with b (wrapped for readability):

@click.option(
 '--opt',
 default=1,
 help='bnFlag for if we want success or failuren0 = failuren1 = success'
)

Rewrapping can be disabled on a per-paragraph basis by adding a line with solely the b escape marker in it. This line will be removed from the help text and rewrapping will be disabled.

share|improve this answer

edited Mar 28 at 12:31

answered Mar 28 at 2:07

ChrisChris

65.4k1818 gold badges134134 silver badges130130 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, this sounds reasonable but it is a little bit strange as why there is still n after "failure" and before "0"? Or if n won't influence how click recognize lines, adding b might remove the whole help text.
  
  – Sraw
  Mar 28 at 3:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Sraw, I'm not sure exactly how this works, but I think your inline n values are rendered but not considered when Click adds its own newlines. Give it a try and see what happens.
  
  – Chris
  Mar 28 at 3:06
  

  
  
  
  

add a comment | 

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2

I think Click is wrapping your paragraph based on the width of the terminal but not factoring in newlines:

The default behavior of Click is to rewrap text based on the width of the terminal. In some circumstances, this can become a problem. The main issue is when showing code examples, where newlines are significant.

If you take the whole help string, with the padding that Click itself adds, and remove all newlines, the word success ends at character position 81:

 --opt INTEGER Flag for if we want success or failure 0 - failure 1 - success
123456789012345678901234567890123456789012345678901234567890123456789012345678901
 1 2 3 4 5 6 7 8

If the newlines themselves are included in its calculation that brings us to 83. I'm not sure how wide your terminal is, but 80 columns is a common width.

See if you can override this with b (wrapped for readability):

@click.option(
 '--opt',
 default=1,
 help='bnFlag for if we want success or failuren0 = failuren1 = success'
)

Rewrapping can be disabled on a per-paragraph basis by adding a line with solely the b escape marker in it. This line will be removed from the help text and rewrapping will be disabled.

share|improve this answer

edited Mar 28 at 12:31

answered Mar 28 at 2:07

ChrisChris

65.4k1818 gold badges134134 silver badges130130 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, this sounds reasonable but it is a little bit strange as why there is still n after "failure" and before "0"? Or if n won't influence how click recognize lines, adding b might remove the whole help text.
  
  – Sraw
  Mar 28 at 3:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Sraw, I'm not sure exactly how this works, but I think your inline n values are rendered but not considered when Click adds its own newlines. Give it a try and see what happens.
  
  – Chris
  Mar 28 at 3:06
  

  
  
  
  

add a comment | 

2

I think Click is wrapping your paragraph based on the width of the terminal but not factoring in newlines:

The default behavior of Click is to rewrap text based on the width of the terminal. In some circumstances, this can become a problem. The main issue is when showing code examples, where newlines are significant.

If you take the whole help string, with the padding that Click itself adds, and remove all newlines, the word success ends at character position 81:

 --opt INTEGER Flag for if we want success or failure 0 - failure 1 - success
123456789012345678901234567890123456789012345678901234567890123456789012345678901
 1 2 3 4 5 6 7 8

If the newlines themselves are included in its calculation that brings us to 83. I'm not sure how wide your terminal is, but 80 columns is a common width.

See if you can override this with b (wrapped for readability):

@click.option(
 '--opt',
 default=1,
 help='bnFlag for if we want success or failuren0 = failuren1 = success'
)

Rewrapping can be disabled on a per-paragraph basis by adding a line with solely the b escape marker in it. This line will be removed from the help text and rewrapping will be disabled.

share|improve this answer

edited Mar 28 at 12:31

answered Mar 28 at 2:07

ChrisChris

65.4k1818 gold badges134134 silver badges130130 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, this sounds reasonable but it is a little bit strange as why there is still n after "failure" and before "0"? Or if n won't influence how click recognize lines, adding b might remove the whole help text.
  
  – Sraw
  Mar 28 at 3:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Sraw, I'm not sure exactly how this works, but I think your inline n values are rendered but not considered when Click adds its own newlines. Give it a try and see what happens.
  
  – Chris
  Mar 28 at 3:06
  

  
  
  
  

add a comment | 

I think Click is wrapping your paragraph based on the width of the terminal but not factoring in newlines:

The default behavior of Click is to rewrap text based on the width of the terminal. In some circumstances, this can become a problem. The main issue is when showing code examples, where newlines are significant.

If you take the whole help string, with the padding that Click itself adds, and remove all newlines, the word success ends at character position 81:

 --opt INTEGER Flag for if we want success or failure 0 - failure 1 - success
123456789012345678901234567890123456789012345678901234567890123456789012345678901
 1 2 3 4 5 6 7 8

If the newlines themselves are included in its calculation that brings us to 83. I'm not sure how wide your terminal is, but 80 columns is a common width.

See if you can override this with b (wrapped for readability):

@click.option(
 '--opt',
 default=1,
 help='bnFlag for if we want success or failuren0 = failuren1 = success'
)

Rewrapping can be disabled on a per-paragraph basis by adding a line with solely the b escape marker in it. This line will be removed from the help text and rewrapping will be disabled.

share|improve this answer

edited Mar 28 at 12:31

answered Mar 28 at 2:07

ChrisChris

65.4k1818 gold badges134134 silver badges130130 bronze badges

 --opt INTEGER Flag for if we want success or failure 0 - failure 1 - success
123456789012345678901234567890123456789012345678901234567890123456789012345678901
 1 2 3 4 5 6 7 8

@click.option(
 '--opt',
 default=1,
 help='bnFlag for if we want success or failuren0 = failuren1 = success'
)

share|improve this answer

edited Mar 28 at 12:31

answered Mar 28 at 2:07

ChrisChris

65.4k1818 gold badges134134 silver badges130130 bronze badges

answered Mar 28 at 2:07

ChrisChris

65.4k1818 gold badges134134 silver badges130130 bronze badges

answered Mar 28 at 2:07

ChrisChris

65.4k1818 gold badges134134 silver badges130130 bronze badges