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Better diff coloring #169

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Aug 25, 2012
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Better diff coloring #169

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94fce05
use same color config method as core
alexcoplan Aug 25, 2012
248004e
improve diff coloring code
alexcoplan Aug 25, 2012
7cdd88b
revert to using static color methods
alexcoplan Aug 25, 2012
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31 changes: 19 additions & 12 deletions lib/rspec/expectations/differ.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -63,30 +63,37 @@ def context_lines
3
end

def color(text, code)
"\e[#{code}m#{text}\e[0m"
def color(text, color_code)
"\e[#{color_code}m#{text}\e[0m"
end

def red(text)
color(text, 31)
end

def green(text)
color(text, 32)
end

def blue(text)
color(text, 34)
end
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Honestly, I find this to be less readable and succinct than what you had before. I don't have a preference for color(text, red) over red(text) as an API (both seem equally fine to me), but using a hash and define_method adds extra indirection over what you had before. If you want the separate methods for each color, I'd prefer:

def red
  color(text, 31)
end

def green
  color(text, 32)
end

def blue
  color(text, 34)
end

I know on 1.8 that methods defined with define_method are slower when called than methods defined with def. Not sure about 1.9 (I haven't benchmarked it), but I expect it's still slower. So that's another reason to prefer def over define_method for this case.


def color_diff(diff)
return diff unless RSpec::Matchers.configuration.color?

red = 31
green = 32
blue = 34

lines = diff.lines.map do |line|
diff.lines.map { |line|
case line[0].chr
when "+"
color(line, green)
green line
when "-"
color(line, red)
red line
when "@"
line[1].chr == "@" ? color(line, blue) : line
line[1].chr == "@" ? blue(line) : line
else
line
end
end
lines.join
}.join
end

def object_to_string(object)
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2 changes: 1 addition & 1 deletion lib/rspec/matchers/configuration.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ def syntax
# fallback if rspec core not available
if defined?(RSpec::Core)
def color?
RSpec.configuration.color
RSpec.configuration.color_enabled?
end
else
attr_writer :color
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