Formula#system: print dot for travis

Library/Homebrew/cmd/test-bot.rb

@@ -530,7 +530,7 @@ module Homebrew
       formula_fetch_options << canonical_formula_name
       test "brew", "fetch", "--retry", *formula_fetch_options
       test "brew", "uninstall", "--force", canonical_formula_name if formula.installed?
-      install_args = []
+      install_args = ["--verbose"]
       install_args << "--build-bottle" unless ARGV.include? "--no-bottle"
       install_args << "--HEAD" if ARGV.include? "--HEAD"
 
@@ -848,7 +848,11 @@ module Homebrew
     ENV["HOMEBREW_SANDBOX"] = "1"
     ENV["HOMEBREW_NO_EMOJI"] = "1"
     ENV["HOMEBREW_FAIL_LOG_LINES"] = "150"
-    ARGV << "--verbose" if ENV["TRAVIS"]
+
+    if ENV["TRAVIS"]
+      ARGV << "--verbose"
+      ENV["HOMEBREW_VERBOSE_USING_DOTS"] = "1"
+    end
 
     if ARGV.include?("--ci-master") || ARGV.include?("--ci-pr") \
        || ARGV.include?("--ci-testing")

Library/Homebrew/formula.rb

@@ -1255,6 +1255,8 @@ class Formula
   # system "make", "install"</pre>
   def system(cmd, *args)
     verbose = ARGV.verbose?
+    verbose_using_dots = !ENV["HOMEBREW_VERBOSE_USING_DOTS"].nil?
+
     # remove "boring" arguments so that the important ones are more likely to
     # be shown considering that we trim long ohai lines to the terminal width
     pretty_args = args.dup
@@ -1288,10 +1290,24 @@ class Formula
           end
           wr.close
 
+          if verbose_using_dots
+            last_dot = Time.at(0)
+            while buf = rd.gets
+              log.puts buf
+              # make sure dots printed with interval of at least 1 min.
+              if (Time.now - last_dot) > 60
+                print "."
+                $stdout.flush
+                last_dot = Time.now
+              end
+            end
+            puts
+          else
             while buf = rd.gets
               log.puts buf
               puts buf
             end
+          end
         ensure
           rd.close
         end