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Contents
require 'erb'
# Renders Erb and provide better backtrace where there's an error
#
# Usage:
#
# result = Jets::Erb.result(path, key1: "val1", key2: "val2")
#
class Jets::Erb
class << self
def result(path, variables={})
set_template_variables(variables)
template = IO.read(path)
begin
ERB.new(template, nil, "-").result(binding)
rescue Exception => e
puts e
puts e.backtrace if ENV['JETS_DEBUG']
# how to know where ERB stopped? - https://www.ruby-forum.com/topic/182051
# syntax errors have the (erb):xxx info in e.message
# undefined variables have (erb):xxx info in e.backtrac
error_info = e.message.split("\n").grep(/\(erb\)/)[0]
error_info ||= e.backtrace.grep(/\(erb\)/)[0]
raise unless error_info # unable to find the (erb):xxx: error line
line = error_info.split(':')[1].to_i
puts "Error evaluating ERB template on line #{line.to_s.color(:red)} of: #{path.sub(/^\.\//, '').color(:green)}"
template_lines = template.split("\n")
context = 5 # lines of context
top, bottom = [line-context-1, 0].max, line+context-1
spacing = template_lines.size.to_s.size
template_lines[top..bottom].each_with_index do |line_content, index|
line_number = top+index+1
if line_number == line
printf("%#{spacing}d %s\n".color(:red), line_number, line_content)
else
printf("%#{spacing}d %s\n", line_number, line_content)
end
end
exit 1 unless ENV['TEST']
end
end
def set_template_variables(variables)
variables.each do |key, value|
instance_variable_set(:"@#{key}", value)
end
end
end
end
Version data entries
83 entries across 83 versions & 3 rubygems