A Ruby backtrace nicely printed.

First, install it:

$ gem install backtrace

Then, use it like this, to print a backtrace:

require 'backtrace'
begin
  # do something dangerous
rescue StandardError => e
  puts Backtrace.new(e)
end

screenshot

A more compact version would use a block:

require 'backtrace'
Backtrace.exec(swallow: true) do
  # do something dangerous
end

You can also provide a logging facility, to log the backtrace:

require 'backtrace'
log = Log.new # it must implement method error(msg)
Backtrace.exec(swallow: true, log: log) do
  # do something dangerous
end

Sometimes you may need to hide unimportant lines of the backtrace, which are not related to your code base. You can use mine argument of the constructor, which is a regular expression or a string. When it's met in the backtrace, the printing will stop:

require 'backtrace'
begin
  # do something dangerous
rescue StandardError => e
  puts Backtrace.new(e, mine: 'yegor')
end

That's it.

License

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.