Update to ruby/mspec@b9c69c5

Author: eregon

spec/mspec/tool/tag_from_output.rb

@@ -1,3 +1,5 @@
+#!/usr/bin/env ruby
+
 # Adds tags based on error and failures output (e.g., from a CI log),
 # without running any spec code.
 
@@ -8,14 +10,12 @@
 abort 'Could not find tags directory' unless tags_dir
 
 output = ARGF.readlines
-# Remove leading "[exec] " from JRuby logs
-output = output.map { |line| line.sub(/^\[exec\] /, '') }
 
 NUMBER = /^\d+\)$/
 ERROR_OR_FAILED = / (ERROR|FAILED)$/
 SPEC_FILE = /^(\/.+_spec\.rb)\:\d+/
 
-failures = output.slice_before(NUMBER).select { |number, error_line, *rest|
+output.slice_before(NUMBER).select { |number, error_line, *rest|
   number =~ NUMBER and error_line =~ ERROR_OR_FAILED
 }.each { |number, error_line, *rest|
   description = error_line.match(ERROR_OR_FAILED).pre_match
@@ -31,9 +31,8 @@
   Dir.mkdir(dir) unless Dir.exist?(dir)
 
   tag_line = "fails:#{description}"
-  unless File.exist?(tags_file) and File.readlines(tags_file, chomp: true).include?(tag_line)
-    File.open(tags_file, 'a') do |f|
-      f.puts tag_line
-    end
+  lines = File.exist?(tags_file) ? File.readlines(tags_file, chomp: true) : []
+  unless lines.include?(tag_line)
+    File.write(tags_file, (lines + [tag_line]).join("\n") + "\n")
   end
 }