Respect BROWSER environment variable

Library/Homebrew/cmd/create.rb

@@ -8,9 +8,9 @@ module Homebrew extend self
 
     # Allow searching MacPorts or Fink.
     if ARGV.include? '--macports'
-      exec "open", "http://www.macports.org/ports.php?by=name&substr=#{ARGV.next}"
+      exec_browser "http://www.macports.org/ports.php?by=name&substr=#{ARGV.next}"
     elsif ARGV.include? '--fink'
-      exec "open", "http://pdb.finkproject.org/pdb/browse.php?summary=#{ARGV.next}"
+      exec_browser "http://pdb.finkproject.org/pdb/browse.php?summary=#{ARGV.next}"
     end
 
     raise UsageError if ARGV.named.empty?

Library/Homebrew/cmd/home.rb

@@ -1,9 +1,9 @@
 module Homebrew extend self
   def home
     if ARGV.named.empty?
-      exec "open", HOMEBREW_WWW
+      exec_browser HOMEBREW_WWW
     else
-      exec "open", *ARGV.formulae.map{ |f| f.homepage }
+      exec_browser *ARGV.formulae.map{ |f| f.homepage }
     end
   end
 end

Library/Homebrew/cmd/search.rb

@@ -4,9 +4,9 @@ require "blacklist"
 module Homebrew extend self
   def search
     if ARGV.include? '--macports'
-      exec "open", "http://www.macports.org/ports.php?by=name&substr=#{ARGV.next}"
+      exec_browser "http://www.macports.org/ports.php?by=name&substr=#{ARGV.next}"
     elsif ARGV.include? '--fink'
-      exec "open", "http://pdb.finkproject.org/pdb/browse.php?summary=#{ARGV.next}"
+      exec_browser "http://pdb.finkproject.org/pdb/browse.php?summary=#{ARGV.next}"
     else
       query = ARGV.first
       rx = case query

Library/Homebrew/utils.rb

@@ -171,11 +171,18 @@ end
 
 def exec_editor *args
   return if args.to_s.empty?
+  safe_exec(which_editor, *args)
+end
 
-  # Invoke bash to evaluate env vars in $EDITOR
-  # This also gets us proper argument quoting.
-  # See: https://github.com/mxcl/homebrew/issues/5123
-  system "bash", "-i", "-c", which_editor + ' "$@"', "--", *args
+def exec_browser *args
+  browser = ENV['HOMEBREW_BROWSER'] || ENV['BROWSER'] || "open"
+  safe_exec(browser, *args)
+end
+
+def safe_exec cmd, *args
+  # This buys us proper argument quoting and evaluation
+  # of environment variables in the cmd parameter.
+  exec "/bin/sh", "-i", "-c", cmd + ' "$@"', "--", *args
 end
 
 # GZips the given paths, and returns the gzipped paths