app.rb in respec-0.9.0

- old
+ new

@@ -10,15 +10,21 @@
         @args = args
         @raw_args = []
       end
       @failures_path = self.class.default_failures_path
       @update_failures = true
+      @error = nil
       process_args
     end
 
     attr_accessor :failures_path
 
+    def error
+      command
+      @error
+    end
+
     def command
       @command ||= program_args + generated_args + raw_args + formatter_args
     end
 
     def program_args
@@ -56,10 +62,11 @@
         |
         |Run rspec, recording failed examples for easy rerunning later.
         |
         |RESPEC-ARGS may consist of:
         |
+        |  d              Run all spec files changed since the last git commit
         |  f              Rerun all failed examples
         |  <N>            Rerun only the N-th failure
         |  <file name>    Run all specs in this file
         |  <file name:N>  Run specs at line N in this file
         |  <other>        Run only examples matching this pattern
@@ -77,10 +84,11 @@
     def process_args
       args = []
       files = []
       pass_next_arg = false
       using_filters = false
+      changed_only = false
       @args.each do |arg|
         if pass_next_arg
           args << arg
           pass_next_arg = false
         elsif rspec_option_that_requires_an_argument?(arg)
@@ -92,10 +100,12 @@
           @help_only = true
         elsif arg =~ /\A-/
           args << arg
         elsif arg =~ /\AFAILURES=(.*)\z/
           self.failures_path = $1
+        elsif arg == 'd'
+          changed_only = true
         elsif arg == 'f'
           # failures_path could still be overridden -- delay evaluation of this.
           args << lambda do
             if File.exist?(failures_path)
               if failures.empty?
@@ -115,11 +125,11 @@
           if (failure = failures[i - 1])
             args << '-e' << failure
             @update_failures = false
             using_filters = true
           else
-            warn "invalid failure: #{i} for (1..#{failures.size})"
+            @error = "invalid failure: #{i} for (1..#{failures.size})"
           end
         else
           args << '-e' << arg.gsub(/[$]/, '\\\\\\0')
         end
       end
@@ -141,13 +151,26 @@
 
       # Since we append our formatter as a file to run, rspec won't fall back to
       # using 'spec' by default. Add it explicitly here.
       files << 'spec' if files.empty?
 
+      # Filter files only to those changed if 'd' is present.
+      if changed_only
+        files = changed_paths(files)
+      end
+
       # If we selected individual failures to rerun, don't give the files to
       # rspec, as those files will be run in their entirety.
       @generated_args = expanded
       @generated_args.concat(files)
+    end
+
+    def changed_paths(paths)
+      changes = `git status --short --untracked-files=all #{paths.shelljoin}`
+      changes.lines.map do |line|
+        path = line[3..-1].chomp
+        path if File.exist?(path) && path =~ /\.rb\z/i
+      end.compact.uniq
     end
 
     def failures
       @failures ||=
         if File.exist?(failures_path)