Merge pull request #1190 from vladshablinsky/no-autoupdate-on-help

brew.sh: don't autoupdate if --help passed

Library/Homebrew/brew.rb

@@ -32,20 +32,17 @@ begin
 
   empty_argv = ARGV.empty?
   help_flag_list = %w[-h --help --usage -?]
-  help_flag = false
+  help_flag = !ENV["HOMEBREW_HELP"].nil?
   internal_cmd = true
   cmd = nil
 
   ARGV.dup.each_with_index do |arg, i|
     break if help_flag && cmd
 
-    if help_flag_list.include?(arg)
+    if arg == "help" && !cmd
-      # Option-style help: Both `--help <cmd>` and `<cmd> --help` are fine.
-      help_flag = true
-    elsif arg == "help" && !cmd
       # Command-style help: `help <cmd>` is fine, but `<cmd> help` is not.
       help_flag = true
-    elsif !cmd
+    elsif !cmd && !help_flag_list.include?(arg)
       cmd = ARGV.delete_at(i)
     end
   end

Library/Homebrew/brew.sh

@@ -183,6 +183,15 @@ then
   set -- "$@" -v
 fi
 
+for arg in "$@"
+do
+  if [[ $arg = "--help" || $arg = "-h" || $arg = "--usage" || $arg = "-?" ]]
+  then
+    export HOMEBREW_HELP="1"
+    break
+  fi
+done
+
 HOMEBREW_ARG_COUNT="$#"
 HOMEBREW_COMMAND="$1"
 shift
@@ -272,6 +281,7 @@ setup-analytics
 report-analytics-screenview-command
 
 update-preinstall() {
+  [[ -z "$HOMEBREW_HELP" ]] || return
   [[ -z "$HOMEBREW_NO_AUTO_UPDATE" ]] || return
   [[ -z "$HOMEBREW_UPDATE_PREINSTALL" ]] || return