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Contents
# TITLE:
#
# Reporting Extensions
#
# DESCRIPTION:
#
# Kernel extensions for debugging, warning and demoing.
#
# AUTHORS:
#
# - TransDelabug
module Kernel
module_function
# Redefines standrard #p kernel method
# to pass through its argument.
#
# DEPRECATE AS OF 1.9
def p(x)
puts x.inspect
x
end
# Like #p but gives file and line number.
def d(x)
puts "#{__FILE__}, #{__LINE__}: #{x.inspect}"
end
# Pretty prints an exception/error object,
# useful for helpfull debug messages.
#
# Input:
# The Exception/StandardError object
#
# Output:
# The pretty printed string.
def pp_exception(ex)
return %{#{ex.message}\n #{ex.backtrace.join("\n ")}\n LOGGED FROM: #{caller[0]}}
end
# For debugging and showing examples. Currently this
# takes an argument of a string in a block.
#
# demo {%{ a = [1,2,3] }}
# demo {%{ a.slice(1,2) }}
# demo {%{ a.map { |x| x**3 } }}
#
# Produces:
#
# a = [1,2,3] #=> [1, 2, 3]
# a.slice(1,2) #=> [2, 3]
# a.map { |x| x**3 } #=> [1, 8, 27]
#
#--
# Is there a way to do this without the eval string in block?
# Preferably just a block and no string.
#++
def demo(out=$stdout,&block)
out << sprintf("%-25s#=> %s\n", expr = block.call, eval(expr, block.binding).inspect)
end
# Like #warn produces the current line number as well.
#
# warn_with_line("You have been warned.")
#
# _produces_
#
# 3: Warning: You have been warned.
#
# Note that this method depends on the output of #caller.
def warn_with_line(msg="", fulltrace=nil)
trace = caller(1)
where = trace[0].sub(/:in.*/,'')
STDERR.puts "#{where}: Warning: #{msg}"
STDERR.puts trace.map { |t| "\tfrom #{t}" } if fulltrace
end
end
Version data entries
5 entries across 5 versions & 1 rubygems