# test_modified.rake
# by Josh Susser (josh@hasmanythrough.com)
# v0.1 - 2006/01/29
#
# Run tests for all versioned (using Subversion) controller and model files
# that have modifications to be committed to the repository.  Also runs
# modified tests.  Handles files in subdirectories properly.
#
# svn status codes that tests are run for: A C M R ?
#
# Usage:
#   1) Drop this file into <railsapp>/lib/tasks
#   2) In your <railsapp> directory, type "rake modified"

# return subset of lines that indicate modified files, stripped of status codes
# lines should be an array of output lines from 'svn status' command
def modified_files(status_lines)
  status_lines.find_all {|s| s[0..0] =~ /A|C|M|R|\?/}.map {|t| t[7..-1]}
end

# return path of test corresponding to app file in base directory
def test_path(path, base_dir, test_dir)
  base_dir += "/" unless base_dir[-1..-1] == "/"
  test_dir += "/" unless test_dir[-1..-1] == "/"
  test_dir + path[(base_dir.length)..(-1 * " .rb".length)] + "_test.rb"
end

desc 'Test files for subversion commit'
Rake::TestTask.new(:modified => [:prepare_test_database]) do |t|
  tests =       modified_files(`svn status test`.split("\n"))
  models =      modified_files(`svn status app/models`.split("\n"))
  controllers = modified_files(`svn status app/controllers`.split("\n"))

  tests = (tests + 
           models.collect      {|m| test_path(m, "app/models", "test/unit")} +
           controllers.collect {|c| test_path(c, "app/controllers", "test/functional")}
           ).uniq
  
  if tests.empty? then
    puts "No modifications to test."
    t.libs << 'test'
    t.test_files = []
  else
    t.libs << 'test'
    t.test_files = tests
    t.verbose = true
  end
end