ruby冲泡more.rb

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# Small utility which uses the homepage and nokogori to get a description from the formula&＃39;s homepage.
#
# As written in the homebrew wiki:
# > Homebrew doesn’t have a description field because the homepage is always up to date,
# > and Homebrew is not. Thus it’s less maintenance for us. To satisfy the description
# > we’re going to invent a new packaging microformat and persuade everyone to publish
# > it on their homepage.
#
# Too bad no packaging microformat has yet been invented, but brew-more just first looks for a
# `` tag, then for an `a#project_summary_link` tag (which is used in
# While this does not lead to a good description for all formulas, it works for quiet a few,
# try e.g. `brew more rubinius`.
#
# Note: this command depends on `nokogori`, `json` and `rubygems`
#
# Edit: non-sudo gem install works fine (by adamv)
# Edit: use google search instead of title as fallback - returns pretty good results :)
# Edit: ensure error contains json & nokogiri gem
#
require &＃39;formula&＃39;
require &＃39;uri&＃39;
require &＃39;open-uri&＃39;
require &＃39;rubygems&＃39;
begin
require &＃39;json&＃39;
require &＃39;nokogiri&＃39;
rescue LoadError
onoe "command requires &＃39;json&＃39; and &＃39;nokogiri&＃39; gem..."
exit 2
end
# split description at 80 chars
MAX_CHARS = 120
class Object
# Define try() method to simplify Nokogori scrape-ing
def try(method, *args); self.nil? ? nil : self.send(method, *args) end
end
# Print usage
def usage(code = 0)
puts "Usage: brew more [formula] ... (formula description scraper)"
exit(code)
end
def scrape_info(formula)
more = ""
google = false

if doc = Nokogiri::HTML(open(formula.homepage))
part = doc.xpath(&＃39;/html/head/meta[@name="description"]&＃39;).first.try(:[], &＃39;content&＃39;) || doc.css(&＃39;a#project_summary_link&＃39;).first.try(:text)
unless part
# try a google search :)
if hash = JSON.load(open("http://www.google.com/uds/GwebSearch?q=#{URI.escape(formula.homepage)}&v=1.0")).try(:[], &＃39;responseData&＃39;).try(:[], &＃39;results&＃39;).try(:first)
part = Nokogiri::HTML(hash[&＃39;title&＃39;]).text + &＃39; &＃39; + Nokogiri::HTML(hash[&＃39;content&＃39;]).text
google = true
end
end
more,c = part.split(/ +/).inject([&＃39; &＃39;,1]) do |res, i|
if (i.length + 1 + res[1]) > MAX_CHARS
res[0] <<"\n "
res[1] = 1
end
[res[0] <<" " < end if part
more = "(Description via Google) \n" < end

morebody = formula.homepage.to_s, more, "\n"
ohai "#{formula.name} #{formula.version}" + (formula.prefix.parent.directory? ? " (installed)" : ""), morebody
end
if ARGV.include?(&＃39;-h&＃39;) || ARGV.include?(&＃39;--help&＃39;)
usage
elsif ARGV.named.empty?
onoe "please specifiy a formula"
usage(1)
end
ARGV.formulae.each { |formula| scrape_info(formula) }