Merge pull request #111 from jhawthorn/output_directory

Change default output to current directory

exe/vernier

@@ -18,6 +18,9 @@ FLAGS:
         o.on('--output [FILENAME]', String, "output filename") do |s|
           options[:output] = s
         end
+        o.on('--output-dir [DIRECTORY]', String, "output directory (default .)") do |s|
+          options[:output_dir] = s
+        end
         o.on('--interval [MICROSECONDS]', Integer, "sampling interval (default 500)") do |i|
           options[:interval] = i
         end

lib/vernier/autorun.rb

@@ -29,8 +29,24 @@ def self.start
     def self.stop
       result = @collector.stop
       @collector = nil
+
       output_path = options[:output]
-      output_path ||= Tempfile.create(["profile", ".vernier.json.gz"]).path
+      unless output_path
+        output_dir = options[:output_dir]
+        unless output_dir
+          if File.writable?(".")
+            output_dir = "."
+          else
+            output_dir = Dir.tmpdir
+          end
+        end
+        prefix = "profile-"
+        timestamp = Time.now.strftime("%Y%m%d-%H%M%S")
+        suffix = ".vernier.json.gz"
+
+        output_path = File.expand_path("#{output_dir}/#{prefix}#{timestamp}-#{$$}#{suffix}")
+      end
+
       result.write(out: output_path)
 
       STDERR.puts(result.inspect)