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twbs--bootstrap-sass/tasks/converter.rb

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# Based on convert script from vwall/compass-twitter-bootstrap gem.
# https://github.com/vwall/compass-twitter-bootstrap/blob/master/build/convert.rb
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this work except in compliance with the License.
# You may obtain a copy of the License in the LICENSE file, or at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require 'open-uri'
require 'json'
class Converter
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def initialize(branch)
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@repo = 'twbs/bootstrap'
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@branch = branch || 'master'
end
def process
process_stylesheet_assets
process_javascript_assets
end
def process_stylesheet_assets
puts "\nProcessing stylesheets..."
bootstrap_less_files.each do |name|
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file = open("https://raw.github.com/#@repo/#@branch/less/#{name}").read
case name
when 'bootstrap.less'
file = replace_file_imports(file)
when 'mixins.less'
file = replace_vars(file)
file = replace_escaping(file)
file = replace_mixin_file(file)
file = replace_mixins(file)
when 'utilities.less'
file = replace_mixin_file(file)
file = convert_to_scss(file)
when 'variables.less'
file = convert_to_scss(file)
file = insert_default_vars(file)
else
file = convert_to_scss(file)
end
name = name.gsub(/\.less$/, '.scss')
if name == 'bootstrap.scss'
path = "vendor/assets/stylesheets/bootstrap/bootstrap.scss"
else
path = "vendor/assets/stylesheets/bootstrap/_#{name}"
end
save_file(path, file)
end
end
def process_javascript_assets
puts "\nProcessing javascripts..."
bootstrap_js_files.each do |name|
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file = open("https://raw.github.com/#@repo/#@branch/js/#{name}").read
path = "vendor/assets/javascripts/bootstrap/#{name}"
save_file(path, file)
end
# Update javascript manifest
content = ''
bootstrap_js_files.each do |name|
name = name.gsub(/\.js$/, '')
content << "//= require bootstrap/#{name}\n"
end
path = "vendor/assets/javascripts/bootstrap.js"
save_file(path, content)
end
private
# Get the sha of a dir
def get_tree_sha(dir)
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trees = open("https://api.github.com/repos/#@repo/git/trees/#@branch").read
trees = JSON.parse trees
trees['tree'].find{|t| t['path'] == dir}['sha']
end
def bootstrap_less_files
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files = open("https://api.github.com/repos/#@repo/git/trees/#{get_tree_sha('less')}").read
files = JSON.parse files
files['tree'].select{|f| f['type'] == 'blob' && f['path'] =~ /.less$/ }.map{|f| f['path'] }
end
def bootstrap_js_files
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files = open("https://api.github.com/repos/#@repo/git/trees/#{get_tree_sha('js')}").read
files = JSON.parse files
files['tree'].select{|f| f['type'] == 'blob' && f['path'] =~ /.js$/ }.map{|f| f['path'] }
end
def get_mixins_name
mixins = []
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less_mixins = open("https://raw.github.com/#@repo/#@branch/less/mixins.less").read
less_mixins.scan(/\.([\w-]+)\(.*\)\s?{?/) do |mixin|
mixins << mixin
end
mixins
end
def convert_to_scss(file)
file = replace_vars(file)
file = replace_mixins(file)
file = replace_less_extend(file)
file = replace_spin(file)
file = replace_image_urls(file)
file = replace_image_paths(file)
file = replace_escaping(file)
file = convert_less_ampersand(file)
file
end
def save_file(path, content, mode='w')
File.open(path, mode) { |file| file.write(content) }
puts "Saved #{path}\n"
end
def replace_file_imports(less)
less.gsub(/@import ["|']([\w-]+).less["|'];/, '@import "bootstrap/\1";');
end
# Replaces the following:
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# .mixin() -> @import mixin()
# #scope > .mixin() -> @import scope-mixin()
def replace_mixins(less)
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mixin_pattern = /(\s*)(([#|\.][\w-]+\s*>\s*)*)\.([\w-]+\(.*\))/
less.gsub(mixin_pattern) do |match|
matches = match.scan(mixin_pattern).flatten
scope = matches[1] || ''
if scope != ''
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scope = scope.scan(/[\w-]+/).join('-') + '-'
end
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"#{matches.first}@include #{scope}#{matches.last}"
end
end
def replace_mixin_file(less)
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less.gsub(/^(\s*)\.([\w-]+\(.*\))(\s*{)/, '\1@mixin \2\3')
end
def replace_vars(less)
less.gsub(/(?!@media|@page|@keyframes|@font-face|@-\w)@/, '$')
end
def replace_less_extend(less)
less.gsub(/\#(\w+) \> \.([\w-]*)(\(.*\));?/, '@include \1-\2\3;')
end
def replace_spin(less)
less.gsub(/spin/, 'adjust-hue')
end
def replace_image_urls(less)
less.gsub(/background-image: url\("?(.*?)"?\);/) {|s| "background-image: image-url(\"#{$1}\");" }
end
def replace_image_paths(less)
less.gsub('../img/', '')
end
def replace_escaping(less)
less = less.gsub(/\~"([^"]+)"/, '#{\1}') # Get rid of ~"" escape
#less.gsub(/(\W)e\("([^\)]+)"\)/) {|s| "#{$1 if $1 != /\s/}#{$2}"} # Get rid of e escape
less.gsub(/(\W)e\(%\((.*)\)\)/, '\1\2') # Get rid of e(%("")) escape
end
def insert_default_vars(scss)
scss.gsub(/^(\$.+);/, '\1 !default;')
end
# Converts &-
def convert_less_ampersand(less)
regx = /^\.badge\s*\{[\s\/\w\(\)]+(&{1}-{1})\w.*?^}$/m
tmp = ''
less.scan(/^(\s*&)(-[\w\[\]]+\s*{.+})$/) do |ampersand, css|
tmp << ".badge#{css}\n"
end
less.gsub(regx, tmp)
end
end