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Update css source map when adding prefixes #202

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Update css source map when adding prefixes #202

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31 changes: 28 additions & 3 deletions lib/autoprefixer-rails/sprockets.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -11,9 +11,34 @@ def self.register_processor(processor)

# Sprockets 3 and 4 API
def self.call(input)
filename = input[:filename]
source = input[:data]
run(filename, source)
filename = input[:filename]
source = input[:data]
previous_map = input[:metadata] && input[:metadata][:map]

output = filename.chomp(File.extname(filename)) + ".css"
map_param = previous_map ? {
inline: false, # do not generate inline source map
prev: false, # omit previous source map if embedded in source css
annotation: false, # do not append source map comment to css
sourcesContent: false,
} : nil
result = @processor.process(source, from: filename, to: output, map: map_param)

result.warnings.each do |warning|
warn "autoprefixer: #{warning}"
end

css = result.css
map = result.map && JSON.parse(result.map)
if previous_map && map
# map = ::Sprockets::SourceMapUtils.format_source_map(map, input)
map = ::Sprockets::SourceMapUtils.combine_source_maps previous_map, map
end

{
data: css,
map: map || previous_map,
}
end

# Add prefixes to `css`
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