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如何使用 awk 根据简单规则缩进源文件？

tag-icon • tag-icon text-processing awk indentation
如何使用 awk 根据简单规则缩进源文件？

如何根据几个简单的规则缩进源代码？

作为示例，我使用 sed 并要求将 selenium HTML 源表转换为以下类似 rspec 的代码。我怎样才能一致地缩进describe和之间的行end？理想情况下，我希望能够添加缩进

describe "Landing" do
visit("http://some_url/url_reset")
visit("http://some_url/url_3_step_minimal_foundation")
# comments
expect(css_vehicle1_auto_year) to be_visible
end
describe "Stage1" do
wait_for_element_present(css_vehicle1_auto_year option_auto_year)
select(auto_year, from: css_vehicle1_auto_year)
...
end
describe "Stage2" do
fill_in(css_driver1_first_name, with: driver1_first_name)
fill_in(css_driver1_last_name, with: driver1_last_name)
...
submit(css_policy_form)
expect(css_vehicle1_coverage_type) to be_visible
end
describe "Stage3" do
wait_for_element_present(css_vehicle1_coverage_type)
select(coverage_type, from: css_vehicle1_coverage_type)
find(css_has_auto_insurance).click
...
submit(css_policy_form)
expect(css_quotes) to be_visible
end

所以我有

describe "Landing" do
  visit("http://some_url/url_reset")
  visit("http://some_url/url_3_step_minimal_foundation")
  # comments
  expect(css_vehicle1_auto_year) to be_visible
end
describe "Stage1" do
  wait_for_element_present(css_vehicle1_auto_year option_auto_year)
  select(auto_year, from: css_vehicle1_auto_year)
  ...
end
describe "Stage2" do
  fill_in(css_driver1_first_name, with: driver1_first_name)
  fill_in(css_driver1_last_name, with: driver1_last_name)
  ...
  submit(css_policy_form)
  expect(css_vehicle1_coverage_type) to be_visible
end
describe "Stage3" do
  wait_for_element_present(css_vehicle1_coverage_type)
  select(coverage_type, from: css_vehicle1_coverage_type)
  find(css_has_auto_insurance).click
  ...
  submit(css_policy_form)
  expect(css_quotes) to be_visible
end

现有 sed 和 awk 的源代码位于https://jsfiddle.net/4gbj5mh4/但这真的很混乱，不是我要问的。我已经掌握了简单的 sed 和 awk 的窍门，但不知道从哪里开始。

如果它也能处理递归那就太好了。对我来说并不重要，但概括可能对其使用此问题的其他人有用，即

describe "a" do
describe "b" do
stuff
more stuff
end
end

到

describe "a" do
  describe "b" do
    stuff
    more stuff
  end
end

顺便说一句，我也在做这个自定义转换，部分原因是我在 selenium 中使用变量作为页面对象，并且它们阻止了到 rspec 的内置导出。

答案1

和awk：

awk '
  /^end/ { sub("  ", "", indent) } # Or { indent = substr(indent, 3) }
  { print indent $0 }
  /^describe/ { indent = indent"  " }
' <file

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