Class: DynamodbModel::Erb
- Inherits:
-
Object
- Object
- DynamodbModel::Erb
- Defined in:
- lib/dynamodb_model/erb.rb
Overview
Renders Erb and provide better backtrace where there’s an error
Usage:
result = DynamodbModel::Erb.result(path, key1: "val1", key2: "val2")
Class Method Summary collapse
Class Method Details
.result(path, variables = {}) ⇒ Object
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 |
# File 'lib/dynamodb_model/erb.rb', line 11 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['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..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.colorize(:red)} of: #{path.sub(/^\.\//, '').colorize(: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".colorize(:red), line_number, line_content) else printf("%#{spacing}d %s\n", line_number, line_content) end end exit 1 unless ENV['TEST'] end end |
.set_template_variables(variables) ⇒ Object
45 46 47 48 49 |
# File 'lib/dynamodb_model/erb.rb', line 45 def set_template_variables(variables) variables.each do |key, value| instance_variable_set(:"@#{key}", value) end end |