diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/kernel')
4 files changed, 96 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/kernel/agnostics.rb b/activesupport/lib/active_support/core_ext/kernel/agnostics.rb new file mode 100644 index 0000000000..dff1145408 --- /dev/null +++ b/activesupport/lib/active_support/core_ext/kernel/agnostics.rb @@ -0,0 +1,11 @@ +module Kernel + # Makes backticks behave (somewhat more) similarly on all platforms. + # On win32 `nonexistent_command` raises Errno::ENOENT; on Unix, the + # spawned shell prints a message to stderr and sets $?. We emulate + # Unix on the former but not the latter. + def `(command) #:nodoc: + super + rescue Errno::ENOENT => e + STDERR.puts "#$0: #{e}" + end +end
\ No newline at end of file diff --git a/activesupport/lib/active_support/core_ext/kernel/daemonizing.rb b/activesupport/lib/active_support/core_ext/kernel/daemonizing.rb new file mode 100644 index 0000000000..0e78819fdf --- /dev/null +++ b/activesupport/lib/active_support/core_ext/kernel/daemonizing.rb @@ -0,0 +1,15 @@ +module Kernel + # Turns the current script into a daemon process that detaches from the console. + # It can be shut down with a TERM signal. + def daemonize + exit if fork # Parent exits, child continues. + Process.setsid # Become session leader. + exit if fork # Zap session leader. See [1]. + Dir.chdir "/" # Release old working directory. + File.umask 0000 # Ensure sensible umask. Adjust as needed. + STDIN.reopen "/dev/null" # Free file descriptors and + STDOUT.reopen "/dev/null", "a" # point them somewhere sensible. + STDERR.reopen STDOUT # STDOUT/ERR should better go to a logfile. + trap("TERM") { exit } + end +end
\ No newline at end of file diff --git a/activesupport/lib/active_support/core_ext/kernel/reporting.rb b/activesupport/lib/active_support/core_ext/kernel/reporting.rb new file mode 100644 index 0000000000..232443601c --- /dev/null +++ b/activesupport/lib/active_support/core_ext/kernel/reporting.rb @@ -0,0 +1,46 @@ +module Kernel + # Sets $VERBOSE to nil for the duration of the block and back to its original value afterwards. + # + # silence_warnings do + # value = noisy_call # no warning voiced + # end + # + # noisy_call # warning voiced + def silence_warnings + old_verbose, $VERBOSE = $VERBOSE, nil + yield + ensure + $VERBOSE = old_verbose + end + + # Sets $VERBOSE to true for the duration of the block and back to its original value afterwards. + def enable_warnings + old_verbose, $VERBOSE = $VERBOSE, true + yield + ensure + $VERBOSE = old_verbose + end + + # Silences stderr for the duration of the block. + # + # silence_stderr do + # $stderr.puts 'This will never be seen' + # end + # + # $stderr.puts 'But this will' + def silence_stderr + old_stderr = STDERR.dup + STDERR.reopen(RUBY_PLATFORM =~ /mswin/ ? 'NUL:' : '/dev/null') + STDERR.sync = true + yield + ensure + STDERR.reopen(old_stderr) + end + + def suppress(*exception_classes) + begin yield + rescue Exception => e + raise unless exception_classes.any? { |cls| e.kind_of?(cls) } + end + end +end
\ No newline at end of file diff --git a/activesupport/lib/active_support/core_ext/kernel/requires.rb b/activesupport/lib/active_support/core_ext/kernel/requires.rb new file mode 100644 index 0000000000..323fea49fe --- /dev/null +++ b/activesupport/lib/active_support/core_ext/kernel/requires.rb @@ -0,0 +1,24 @@ +module Kernel + # Require a library with fallback to RubyGems. Warnings during library + # loading are silenced to increase signal/noise for application warnings. + def require_library_or_gem(library_name) + silence_warnings do + begin + require library_name + rescue LoadError => cannot_require + # 1. Requiring the module is unsuccessful, maybe it's a gem and nobody required rubygems yet. Try. + begin + require 'rubygems' + rescue LoadError => rubygems_not_installed + raise cannot_require + end + # 2. Rubygems is installed and loaded. Try to load the library again + begin + require library_name + rescue LoadError => gem_not_installed + raise cannot_require + end + end + end + end +end
\ No newline at end of file |