Class: Grepgems

Inherits:

Object

• Object
• Grepgems

Defined in:

lib/gemlocker.rb

Instance Method Summary

• #description ⇒ Object

  :nodoc:.

• #grep_libfiles ⇒ Object
• #initialize ⇒ Grepgems constructor

  A new instance of Grepgems.

• #purge_tempfiles ⇒ Object

Constructor Details

#initialize ⇒ Grepgems

Returns a new instance of Grepgems.

# File 'lib/gemlocker.rb', line 197

def initialize 
  @code_path = ARGV
  @tmp_files =['gemlist.log','libfiles.log','errors.log']
  purge_tempfiles;
  @which_cmd = Whichgem.new;
  @lock_cmd=LockCommand.new;
  @out_file_path = Dir.pwd;
end

Instance Method Details

#description ⇒ Object

:nodoc:

# File 'lib/gemlocker.rb', line 205

def description # :nodoc:
 puts "
 -------Usage  -----
gemlocker [DIR1] [DIR2] [DIR3] [DIR......
 Please supply at least one directory path.
 
USES OF GEMLOCKER:
-----------------
1. To avoid problems with new versions of a gem by loading a specific versions of gem;  
2. To list all dependencies - useful while building a  gem/ rake file

More details..
--------------
The gemlocker command will generate a list of +gem+ statements that will lock down
the versions for the gem used in the files of the given paths in the command line.  It will specify exact
versions in the requirements list to ensure that the gems loaded will always
be consistent.  A full recursive search of all effected gems will be
generated.
It generates 4 files
 gemlist.log; errors.log; libfiles.log; and gem_lockdown.rb
 gemlist.log: contains all lib files used in the files of given path;
 errors.log : contains all errors -  Normally user defined lib files etc..
 libfiles.log : lists all lib files-paths
 gem_lockdown.rb : contains all gems and their latest versions.

It is similar to gem lock command; where gemlock generates lock down list for a given gem;
and gemlock generates lock down list for all gems used in a directory (of files.)

Example:

gemlocker /home/us/progdir . ..

will list out all dependencies in  gem_lockdown.rb  in invokation directory by looking at the 'require' statements/lib files  used in  your projects located in /home/us/progdir , current directory, ..  and all their subdirectories; 
gem_lockdown.rb will look like below

require 'rubygems'
gem 'rails', '= 1.0.0'
gem 'rake', '= 0.7.0.1'
gem 'activesupport', '= 1.2.5'
gem 'activerecord', '= 1.13.2'
gem 'actionpack', '= 1.11.2'
gem 'actionmailer', '= 1.1.5'
gem 'actionwebservice', '= 1.0.0'

Just load gem_lockdown.rb from your application to ensure that the currect
versions are loaded.  Make sure that lockdown.rb is loaded *before* any
other require statements.

Note : if you are not using latest versions of gems in your files(project), you may have to edit  gem_lockdown.rb to load the desired versions.
example scenario: If you are using activerecord-1.0.2 and your system is installed with activerecord-2.2.3  then  gem_lockdown.rb will show only 2.2.3; 
 so, you will have to edit the gem_lockdown.rb to modify the version of activerecord to 1.0.2

  "
end

#grep_libfiles ⇒ Object

# File 'lib/gemlocker.rb', line 260

def grep_libfiles
libs=[]
@code_path.each { |p|
  rbfiles = File.join(p,"**", "*.*")
  Dir.glob(rbfiles) {|file|  #puts file;
   f=File.open(file,"r") if File.file?(File.expand_path(file));
   if f then
   while(row = f.gets)
     row.scan(/require\s\'\w+\'/) {|m|  s=m.split("'");   libs<<s.last;}  # getting single quoted requires
     row.scan(/require\s\"\w+\"/) {|m| s= m.split('"');  libs <<s.last;} # gettin double quoted requires
     row.scan(/rrequire\s\'\w+\'/) {|m|  s=m.split("'");   libs<<s.last;}  # get command line requires
     row.scan(/gem\s\'\w+\'/) {|m|  s=m.split("'");   libs<<s.last;}   # get external gem requires.
    end
   f.close
   end

  }
  }
  puts "-----------------------","list of requires", "-----------------------",libs.join( ' ');
  @lock_cmd.execute(@out_file_path,@which_cmd.execute(libs,@out_file_path));
end

#purge_tempfiles ⇒ Object

# File 'lib/gemlocker.rb', line 281

def purge_tempfiles
  @tmp_files.each {|f|  File.delete(f) if File.file?(f) ;}
end