在ruby中的文件很漂亮。

I am trying to pretty print a hash to a file.

我想把散列打印到文件中。

I tried unix redirects [added different flags to it incrementally] :

我尝试了unix重定向[递增地添加不同的标志]:

`echo #{pp  mymap} | tee summary.out 2>&1`

and File IO

和文件输入输出

 my_file = File.new(@dir_+"/myfile.out",'w+')          
 my_file.puts `#{pp get_submap_from_final(all_mapping_file,final_map)}`

It always prints to console and doesnt write to a file.

它总是打印到控制台而不写到文件。

Also there has to be an easier way to write to file in one line in ruby ? instead of doing File.new and then writing to a file ?

还有，必须有一种更简单的方法在ruby中以一行写文件?而不是做文件。新的然后写入文件?

7 个解决方案

#1

require 'pp'

File.open("test.txt","w") do |f|
  PP.pp(self,f)
end

#2

The use of backticks here is perplexing since those are used for executing shell commands.

这里反勾的使用令人费解，因为它们用于执行shell命令。

What you probably mean is:

你的意思是:

File.open(@dir_+"/myfile.out",'w+') do |f|
  f.write(pp(get_submap_from_final(all_mapping_file,final_map)))
end

The pp method always writes to the console so you might see it and still have it written.

pp方法总是写到控制台，所以您可能会看到它，并且仍然要写它。

#3

What about (not using pp directly):

关于(不直接使用pp):

File.open("myfile.out","w+") do |f|
  f.puts mymap.inspect
end

Or even redirect stdout for the file

甚至为文件重定向stdout

file = File.open("myfile.out", "w+)

old_stdout = STDOUT

$stdout = STDOUT = file

pp get_submap_from_final(all_mapping_file,final_map)

$stdout = STDOUT = old_stdout

#4

Doing something similar to what Edu suggested and How do I redirect stderr and stdout to file for a Ruby script? helped.

做一些类似于Edu所建议的事情，以及如何重定向stderr和stdout文件以获取Ruby脚本?帮助。

Here is how the new code is similar to:

新守则的内容如下:

$stdout.reopen(@dir_+"/my_file.out",'w+')
puts "All metrics are:"
pp final_map
$stdout=STDOUT

Would still be interested to know why redirection operators > , and 2>&1 in back-ticks doesn't work

还会有兴趣知道为什么重定向操作>和2>&1的反节拍不起作用吗

#5

Given the mymap from the question, you can use the "show_data" gem, which provides two methods: show_data and format_data. The latter produces a "pretty-printed" string of its argument which can then be fed to any output method.

给定问题中的mymap，您可以使用“show_data”gem，它提供了两个方法:show_data和format_data。后者生成一个“漂亮打印”的参数字符串，然后可以将其输入到任何输出方法。

require 'show_data'

$stderr.puts format_data(mymap)

For example:

例如:

myhash = { 'owners' => 21050, 'users' => 16877, 'portfolios' => 583, 
           'properylists' => 0, 'properties' => 29504, 'units' => 62688, 
           'tenants' => 85856 }
$stderr.puts format_data(myhash)

on STDERR:

STDERR:

 {      'owners' => 21050,
         'users' => 16877,
    'portfolios' => 583,
  'properylists' => 0,
    'properties' => 29504,
         'units' => 62688,
       'tenants' => 85856
}

#6

-1

require 'pp'

class File
  def pp(*objs)
    objs.each {|obj|
      PP.pp(obj, self)
    }
    objs.size <= 1 ? objs.first : objs
  end
end

File.open('output','w') do |file|
  file.pp mymap
end

#7

-1

Here's an expansion to the post above to also to pretty print json output to a file.

这是对上面文章的扩展，也可以将json输出打印到文件中。

require "pp"
require "json"

class File
  def pp(*objs)
    objs.each {|obj|
      PP.pp(obj, self)
    }
    objs.size <= 1 ? objs.first : objs
  end
  def jj(*objs)
    objs.each {|obj|
      obj = JSON.parse(obj.to_json)
      self.puts JSON.pretty_generate(obj)
    }
    objs.size <= 1 ? objs.first : objs
  end
end

test_object = { :name => { first: "Christopher", last: "Mullins" }, :grades => [ "English" => "B+", "Algebra" => "A+" ] }

test_json_object = JSON.parse(test_object.to_json)

File.open("log/object_dump.txt", "w") do |file|
  file.pp(test_object)
end

File.open("log/json_dump.txt", "w") do |file|
  file.jj(test_json_object)
end

#1

require 'pp'

File.open("test.txt","w") do |f|
  PP.pp(self,f)
end

#2