is it possible to show the contents if you just have the .gem file?
I found gem contents command stating in the help:
The contents command lists the files in an installed gem
This works fine, but I wondered if there is a way to list the contents of a not installed gem, if I just have the built .gem file itself.
Use gem unpack.
gem unpack <gemname>.gem
Related
There's a problem when I use gem install gem-ctags
and then gem ctags, It doesn't show any message and doesn't generate any tags on the terminal, nor is there any gem's tags in my tag file.
This link is my dotfile, https://github.com/HexterCH/dotfile, is there anything I do wrong? Let me know if information is not enough.
This is the solution from #larrylv, and it's work.
Remove gem plugin for zshrc, it will make conflict in your gem path.
after that, source zshrc file and run gem ctags again.
You can chase your gem path by using gem env home.
It should be like /Users/<your name>/<your ruby manager>/versions/<your ruby version>/lib/ruby/gems/
For a project I'm working on, I have to do some work on an existing Ruby Gem. I haven't got much previous experience with Ruby and am struggling with a few aspects.
I have the repository cloned locally. I need to edit the current files in the /lib/ directory, which I can do. Is it possible for me to compile the edited files into a Gem and run this Gem? Any help would be really appreciated.
Yes! You can include the gem in a local project and point the Gemfile to your local directory:
Gemfile
source 'https://rubygems.org'
gem 'my_local_gem', path: '/absolute/path/to/your/gem'
Then edit the gem, run your local program and see the changes.
Additionally, you don't always have to clone a whole gem, you can install it via rubygems and use bundle open <gem_name> to open the gem's contents in your supplied editor.
I have written a post describing just that and more here.
Is it possibile to have something like a 'local' gem repository for Ruby?
I'm working on a custom Linux distribution without admin rights. Ruby is installed on the machine (v.1.8.7) but apparently no 'gem' or 'bundle' or whatever are installed. I need to use some Ruby gems like Nokogiri.
Is it possible to use Ruby gems without installing them through gem install?
Yes. Any gem can be used standalone. You just have to either download the source from github, or download the gem and extract its contents manually.
After you've done that you have to add the lib folder of the gem into the load path ($:) of Ruby. For example:
$:.unshift(File.expand_path("nokogiri-1.6.1/lib"))
require 'nokogiri'
Assuming you are running Ruby in the current directory and the Nokogiri source is in the folder nokogiri-1.6.1.
But remember that first you have to do the same with all Nokogiri prerequisites. I.e. all the libraries Nokogiri depends on.
Another option, which is what I would do, is to install RubyGems in your home directory. That can get a little bit tricky though, but it's possible by downloading the RubyGems package and running something like:
ruby setup.rb --prefix=/home/my_user_name/rubygems
Then you need to set up the ENV variables GEM_HOME and GEM_PATH to point to a location in your home directory where you want all your gems to be installed. See "What's the difference between GEM_HOME and GEM_PATH?" for a description of what they do.
You will also need to add something like /home/my_user_name/rubygems/bin to your PATH so that the gem command can be found by the shell.
Ruby dabbler/newbie here who's not familiar with the ecosystem, so apologies if this is one of those super duh questions.
Is there a way to view all the files and/or source code installed by a gem? That is, I just ran
$ gem install sass
And the sass gem is now a part of my local system
$ gem list --local
...
sass (3.1.16, 3.1.2)
...
I want to know what the gem install command put on my system. Is there a command I can run to see all the files installed by the gem?
After some googling, man gem and gem help commands, I discovered the contents command.
$ gem contents sass
However, when I run this command with the aforementioned sass gem, I get the following results
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/engine_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/functions_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/extend_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/logger_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/css2sass_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/conversion_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/script_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/util/subset_map_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/util/multibyte_string_scanner_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/callbacks_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/importer_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/scss/css_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/scss/scss_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/scss/rx_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/util_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/script_conversion_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/less_conversion_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/cache_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/test/sass/plugin_test.rb
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/bin/sass
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/bin/sass-convert
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.16/bin/scss
However, this list seems incomplete as I know there are files in
.../.rvm/gems/ruby-1.9.2-p180/gems/sass-3.1.2/lib/
Why does contents not show the files from lib?
Is it possible for a gem installer to install files outside of the gems folder?
Is there a command that can show everything installed by a gem?
gem has an unpack command: http://guides.rubygems.org/command-reference/#gem-unpack
gem unpack rake
ls rake-0.4.3/
There are two really good ways to do this. There is another gem which allows you to open the gem and edit. This gem is call gem-open
gem install gem-open
then
gem open sass
Another way is to generate your own rdocs.
gem rdoc sass
You can then look at your rdocs by
gem server
Also if you are using rvm, you can type rvm info and it will show GEM_HOME location.
This will be where all your gems source code is.
cd $GEM_HOME
cd gems/sass-3.1.2/
Update:
This is the way I mostly do this now, when using bundler.
cd $(bundle show sass)
This will be the version of sass in your Gemfile.
I usually open a gem by running this command from the console
EDITOR=<your editor> bundle open <name of gem>
The lib/ directory you mentioned is for version 3.1.2 of the gem; gem contents without --version will just list one version (it appears to pick the newest version, but I'm unable to verify this is always true). What output do you get for gem contents --version 3.1.2 sass?
You can also use just rename the .gem file to .tar and extract as a posix archive. The source code is inside it in the lib folder. See https://blog.srcclr.com/extracting-ruby-source-code-from-gem-packages/ for more details.
In addition to gem contents, another command you might find useful is gem environment. If you have multiple paths for your gem installations, they will all be listed under the "GEM PATHS" label.
I pack some ruby code into a gem. I want to refer the code in the gem in some other code.
So in the Gemfile I specify the gem's name, version, and local path. Like:
gem 'gemname','0.x', :path => 'RELATIVE_PATH_TO_GEM_FILE'
After bundle install, I see
Using gemname (0.x) from source at RELATIVE_PATH_TO_GEM_FILE
But when I run the code, it can't find the code in the gem. LOAD_PATH shows ABSOLUTE_PATH_TO_GEM_FILE/lib.
No wonder it can't find the code, there's only gem file under ABSOLUTE_PATH_TO_GEM_FILE. it's not unpacked. So there's no lib directory.
if I gem install that gem file into my system, then all works fine. I can see the gem file was unpacked into source code files.
But my question is if it can refer the local gem file directly somehow?
No, you can't refer to a .gem file directly.
In your terminology, you need to use an "unpacked" gem.
:path => '/foo/bar/'
where /foo/bar/ is a (gem) directory with lib/, etc.
We made a local (not system-wide) gems location. We set these environment variables:
GEM_HOME=/path/to/rubygems-1.3.4
RUBYLIB=/path/to/rubygems-1.3.4/lib/
By setting those, we can then do 'gem install ...' to put the built gem into that directory, and ruby knows where to find them.