格式化帮助文本

格式化帮助文本

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python-click:格式化帮助文本

本文介绍了python-click:格式化帮助文本的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

此问题与点击程序包有关:

  1. 长文本的帮助未按要求显示.
  2. 我也尝试使用/b，但似乎影响不大.
  3. cmd和powershell对于相同的代码都有不同的结果，为什么?
  1. Long text of help is not being displayed as desired.
  2. I tried using /b as well but does not seem to affect much.
  3. cmd and powershell both have different results for same code, why?
import click


def command_required_option_from_option(require_name, require_map):

    class CommandOptionRequiredClass(click.Command):

        def invoke(self, ctx):
            require = ctx.params[require_name]
            if require not in require_map:
                raise click.ClickException(
                    "Unexpected value for --'{}': {}".format(
                        require_name, require))
            if ctx.params[require_map[require]] is None:
                raise click.ClickException(
                    "With {}={} must specify option --{}".format(
                        require_name, require, require_map[require]))
            super(CommandOptionRequiredClass, self).invoke(ctx)

    return CommandOptionRequiredClass

required_options = {
    1: 'gs',  # generator_string
    2: 'nosp',  # number_of_sample_points
    3: 'nocp',  # number_of_center_points
}


@click.command(context_settings=dict(max_content_width=800), cls=command_required_option_from_option('doe', required_options))
@click.option('--input', required=True, type=click.Path(exists=True), metavar='FILE', help="""\b
    Path to csv file""" )
@click.option('--doe', required=True, type=int, help="""
\b
Select DOE algorithm:
1 Full factorial
2 2-level fractional factorial
3 Plackett-Burman
4 Sukharev grid
5 Box-Behnken
6 Box-Wilson (Central-composite) with center-faced option
7 Box-Wilson (Central-composite) with center inscribed
8 Box-Wilson (Central-composite) with centser-circumscribed option
9 Latin hypercube (simple)
10 Latin hypercube (space-filling)
11 Random k-means cluster
12 Maximin reconstruction
13 Halton sequence based
14 Uniform random matrix
...
""",)
@click.option( '--gs', required=False, type=str, help="""\b
    Generator string for the fractional factorial build""")
@click.option(  '--nosp', required=False, type=int, help="""\b
    Number of random sample points""")
@click.option( '--nocp', required=False, type=int, help="""\b
    Number of center points to be repeated (if more than one):""")
def main(input, doe, gs, nosp, nocp):
    click.echo('input: {}'.format(input))
    click.echo('doe: {}'.format(doe))
    click.echo('generator_string: {}'.format(gs))
    click.echo('Num of sample_points: {}'.format(nosp))
    click.echo('Num of center_points: {}'.format(nocp))


if __name__ == "__main__":
    main()

推荐答案

如果钩住click.formatting.wrap_text，则可以更改click.Command.get_help使用的换行器的行为.

If you hook click.formatting.wrap_text you can change the behavior of the line wrapper that click.Command.get_help uses.

由于您已经继承了click.Command，因此我们可以构建自己的get_help()版本来挂接换行器，例如:

Since you have already inherited from click.Command we can build our own version of get_help() to hook the line wrapper like:

def command_required_option_from_option(require_name, require_map):

    class CommandOptionRequiredClass(click.Command):

        def get_help(self, ctx):
            orig_wrap_test = click.formatting.wrap_text

            def wrap_text(text, width=78, initial_indent='',
                          subsequent_indent='',
                          preserve_paragraphs=False):
                return orig_wrap_test(text.replace('\n', '\n\n'), width,
                                      initial_indent=initial_indent,
                                      subsequent_indent=subsequent_indent,
                                      preserve_paragraphs=True
                                      ).replace('\n\n', '\n')

            click.formatting.wrap_text = wrap_text
            return super(CommandOptionRequiredClass, self).get_help(ctx)

    return CommandOptionRequiredClass

这是如何工作的?

之所以有用，是因为click是一个设计良好的OO框架. @click.command()装饰器通常实例化click.Command对象，但允许使用cls参数覆盖此行为.因此，在我们自己的类中从click.Command继承并超越所需的方法是相对容易的事情.

How does this work?

This works because click is a well designed OO framework. The @click.command() decorator usually instantiates a click.Command object but allows this behavior to be over ridden with the cls parameter. So it is a relatively easy matter to inherit from click.Command in our own class and over ride desired methods.

在这种情况下，我们将覆盖click.Command.get_help().然后在我们的get_help()中，钩住click.formatting.wrap_text().在我们的钩子中，然后将preserve_paragraphs标志设置为True.另外，我们replace()所有\n都带有\n\n，因为这是原始wrap_text()期望标记段落的方式.

In this case, we override click.Command.get_help(). In our get_help() we then hook click.formatting.wrap_text(). In our hook, we then set the preserve_paragraphs flag to True. In addition we replace() all \n with \n\n as this is how the original wrap_text() expects paragraphs to be marked.

import click

required_options = {
    1: 'gs',  # generator_string
    2: 'nosp',  # number_of_sample_points
    3: 'nocp',  # number_of_center_points
}

@click.command(context_settings=dict(max_content_width=800),
               cls=command_required_option_from_option('doe', required_options))
@click.option('--input', required=True, type=click.Path(exists=True),
              metavar='FILE', help="""\b
    Path to csv file""" )
@click.option('--doe', required=True, type=int, help="""
Select DOE algorithm:
1 Full factorial
2 2-level fractional factorial
3 Plackett-Burman
4 Sukharev grid
5 Box-Behnken
6 Box-Wilson (Central-composite) with center-faced option
7 Box-Wilson (Central-composite) with center inscribed
8 Box-Wilson (Central-composite) with center-circumscribed option
9 Latin hypercube (simple)
10 Latin hypercube (space-filling)
11 Random k-means cluster
12 Maximin reconstruction
13 Halton sequence based
14 Uniform random matrix
...
""",)
@click.option( '--gs', required=False, type=str, help="""\b
    Generator string for the fractional factorial build""")
@click.option(  '--nosp', required=False, type=int, help="""\b
    Number of random sample points""")
@click.option( '--nocp', required=False, type=int, help="""\b
    Number of center points to be repeated (if more than one):""")
def main(input, doe, gs, nosp, nocp):
    click.echo('input: {}'.format(input))
    click.echo('doe: {}'.format(doe))
    click.echo('generator_string: {}'.format(gs))
    click.echo('Num of sample_points: {}'.format(nosp))
    click.echo('Num of center_points: {}'.format(nocp))

if __name__ == "__main__":
    main(['--help'])

结果:

Usage: test.py [OPTIONS]

Options:
  --input FILE
                  Path to csv file  [required]
  --doe INTEGER   Select DOE algorithm:
                  1 Full factorial
                  2 2-level fractional factorial
                  3 Plackett-Burman
                  4 Sukharev grid
                  5 Box-Behnken
                  6 Box-Wilson (Central-composite) with center-faced option
                  7 Box-Wilson (Central-composite) with center inscribed
                  8 Box-Wilson (Central-composite) with center-circumscribed
                  option
                  9 Latin hypercube (simple)
                  10 Latin hypercube (space-filling)
                  11 Random k-means cluster
                  12 Maximin reconstruction
                  13 Halton sequence based
                  14 Uniform random matrix
                  ...  [required]
  --gs TEXT
                  Generator string for the fractional factorial build
  --nosp INTEGER
                  Number of random sample points
  --nocp INTEGER
                  Number of center points to be repeated (if more than one):
  --help          Show this message and exit.

这篇关于python-click:格式化帮助文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

08-15 12:11
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