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# frozen_string_literal: true
class Pry
class Command
class Wtf < Pry::ClassCommand
match(/wtf([?!]*)/)
group 'Context'
description 'Show the backtrace of the most recent exception.'
options listing: 'wtf?'
banner <<-'BANNER'
Usage: wtf[?|!]
Show's a few lines of the backtrace of the most recent exception (also available
as `_ex_.backtrace`). If you want to see more lines, add more question marks or
exclamation marks.
wtf?
wtf?!???!?!?
# To see the entire backtrace, pass the `-v` or `--verbose` flag.
wtf -v
BANNER
def options(opt)
opt.on :v, :verbose, "Show the full backtrace"
end
def process
unless pry_instance.last_exception
raise Pry::CommandError, "No most-recent exception"
end
text = ''.dup
unwind_exceptions.each_with_index do |exception, i|
title = (i == 0 ? 'Exception' : 'Caused by')
text << format_header(title, exception)
text << format_backtrace(exception.backtrace)
end
output.puts(text)
end
private
def unwind_exceptions
exception_list = []
exception = pry_instance.last_exception
while exception
exception_list << exception
exception = (exception.cause if exception.respond_to?(:cause))
end
exception_list
end
def format_header(title, exception)
"#{bold(title + ':')} #{exception.class}: #{exception}\n--\n"
end
def format_backtrace(backtrace)
return with_line_numbers(backtrace) if opts.verbose?
size_of_backtrace = [captures[0].size, 0.5].max * 10
with_line_numbers(backtrace.first(size_of_backtrace))
end
def with_line_numbers(backtrace)
Pry::Code.new(backtrace, 0, :text).with_line_numbers.to_s
end
end
Pry::Commands.add_command(Pry::Command::Wtf)
end
end
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