I want to write a small reporting tool and looking to fetch data from MySQL. After searching I found a tool called as Ruport but I am not following where are it's binaries located. If not binaries than how to install it. It discusses the installation commands to install via gems, but where are the files located.
Secondly, do I have to create a Windows interface using fxRuby or wxRuby to work with it?
Are there other free reporting tools for Ruby?
It's probably a good idea to get a good book or two on Ruby, rather than asking these kind of questions, but here goes:
To install a gem, do
gem install gemname
To use it, put the following in Ruby code:
require "rubygems" # May not be necessary
require "gemname"
To find where your gem files are stored, do
gem env
And as for whether you need a GUI for ruport: can you try working that out yourself first?
Related
What's the best way to distribute a simple command-line Ruby app to clients in a way that would not require them to manually install Ruby and required Gems?
In my understanding this task boils down just to a couple of lines of SH/BAT code that does Ruby/Gems checks and if not found goes on with Ruby installation with RVM.
So do these lines of code exist already somewhere or will I need to write something on my own?
I've used this project for small scripts in the past, without any issues
http://www.erikveen.dds.nl/rubyscript2exe/
It creates an EXE file out of your ruby script.
If you need something cross-platform, the BAT/sh option is probably best. You could grab RVM, have RVM install ruby, use bundler for your gems, and then launch the script.
The closest I've found is (I believe) releasy: https://github.com/Spooner/releasy
I failed to find any way of producing a Ruby cross platform installation.
I've created a RubyAnywhere script that tries to solve this task.
I'm really just a beginner to ruby, so hopefully this is an easy one. I've got to the point where I'm starting to look into some of the gems that the community have put together. I decided to check out something that would help my application consume rss feeds. So, headed over to rubygems (which is where i thought people go to get these kinds of things) and searched for rss. I found this one;
http://rubygems.org/gems/simple-rss
instructions were to just install the gem with
gem install simple-rss
So far, so good. When i came to actually use the gem, the documentation I received from doing the above was a bit naff, so i searched a bit further and found the git repo;
https://github.com/cardmagic/simple-rss
The documentation there (their code examples) complain about missing methods etc. and after a bit of digging I came to the conclusion that I must have downloaded an older version of the gem than the git trunk.
So, my question is, should I be using rubygems to get the latest gems, and if not, what other resources are out there to help find the latest builds of the comminities gems?
As far as finding a good gem for a task — use Ruby Toolbox, since it also shows you how actively maintained a gem is. Here's, for example, a section on feed parsing.
If you want to get the latest gem code that hasn't been released yet, you could download the code directly from github and build the gem yourself. However, it's easier to use bundler for that. It allows you to create a Gemfile for your project looking something like the following.
gem 'simple_rss', :git => "git://github.com/cardmagic/simple-rss.git"
Then run bundle command to download and build these gems from their corresponding sources.
In general, bundler is a great solution for managing gem dependencies for any ruby project. It provides ways to quickly reference any released gems, automatically builds gems directly from a git source, git refs, or paths on your filesystem, and has other convenient features.
By far the best place for all things Ruby & Ruby on Rails for the devs is the Ruby Toolbox
I have a bunch of ruby scripts in a folder which is added to $PATH and I think that some of them might be usefult to others. So I want to distribute them and the only 'good' way I know is rubygems (gem containing only binary), it has a very useful advantage of versioning, but also a drawback of initialization time (sometimes it takes some seconds before script starts to run). Are there alternatives?
Gem is good enought for this. I use gem for this purposes as it is very convenient to intall and update.
Gems are built for this. I'm not sure what you think a gem is, but RubyGems is a repository like PEAR for PHP, aptitude for ubuntu, or CPAN for perl, except they contain ruby libraries.
There is no extra overhead or "initialization time" added to your ruby libraries by making them gems. RubyGems simply installs your library - it doesn't do anything else.
Gems are fine for this kind of Ruby script.
To quickly generate a new gem, try out bundle gem.
To quickly distribute gems without using rubygems.org, and in a way that could work for private deployment, check out the idea for microgems.
If you still don't think you need to wrap these in gems, you can simply add the executable bit to your scripts, add shebang lines for ruby, and remove the .rb extension. Then share your script files with whoever wants them.
Would it be possible to override the default "require" by adding automatic download-and-install code for any missing includes (provided that the missing include is published as a ruby gem).
Which would not work in situations where Ruby is not interfaced with a shell. But still I think it would be an interesting idea.
Is there such a mechanism in existence today?
Edit:Removed portion about password check. I just checked and gem install doesn't seem to require me to type my password.
You would be able to hijack require method so as gems are installed when an attempt is made to require them, but still you won't have access to newly installed gem in current process, because gem index has to be reloaded.
I understand the intentions but I think exercise might not be worth it.
When installing a fresh gem the gem will be installed in the GEM_HOME. If that is not writable then it will try in the user's home .gem directory (on *NIX at least).
You could certainly script this. In a way Rail's rake gems:build is just this. Just not on demand.
But, I would recommend against this. You could run into build, versioning, dependency and network issues. And probably security issues as well.
PS: Francis Hwang did something related a while ago, although only as a require, not a require gems.
http://fhwang.net/2005/11/01/urirequire-I-got-yer-Web-2-0-right-here
A better option would be to use bundler and distribute the required gems with the application.
It is also quite simple to write a script to bootstrap the installation of gems if you didn't
want to distribute them with your code (using the bundle install/check commands)
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I'm not sure of all of them, but what are the commands to do things like update Ruby, download a new gem, or update an existing gem? What other important things are there?
Since it might matter, I'm running Windows.
By Ruby commands you probably mean the command line programs for Ruby. These are also called Ruby Helper programs. Here are a few:
ruby - The interpreter itself. Run Ruby scripts or statements.
gem - Ruby Package Manager. Great for automatically downloading or updating small Ruby modules like XML libraries, web servers, or even whole Ruby programs.
irb - Interactive Ruby Prompt. This is an entire Ruby shell that will let you execute any Ruby code you want. You can load libraries, test code directly, anything you can do with Ruby you can do in this shell. Believe me, there is quite a lot that you can do with it to improve your Ruby development workflow [1].
ri - Quick shell access to Ruby documentation. You can find the RDoc information on nearly any Ruby Class or method. The same kind of documentation that you would find on the online ruby-docs.
erb - Evaluates embedded Ruby in Ruby Templated documents. Embedded Ruby is just like embedding php into a document, and this is an interpreter for that kind of document. This is really more for the rails crowd. An alternative would be haml.
rdoc - Generate the standard Ruby documentation for one of your Ruby classes. Its like Javadocs. It parses the Ruby source files and generates the standard documentation from special comments.
testrb and rake. I'm not familiar enough with these. I'd love it if someone could fill these in!
Hopefully this was what you were looking for!
Useful command: Rake
In addition to the commands listed by Joseph Pecoraro, the 'rake' command is also pretty standard when working with Ruby. Rake makes it easy to automate (simple) tasks; like building a RubyGem or running your unit tests.
With rake, the only important command to remember is 'rake -T', which shows a list of rake tasks available in the current directory.
Updating a Ruby gem
To get back to your specific question:
To update a specific gem, you can do two things: simply update the gem:
gem update <gemname>
This will update the gem to the latest version.
Install a Ruby gem
If you want to update to a specific version, you must install it:
gem install <gemname> -v <gemversion>
You can leave out the -v options. Rubygems then installs the latest version.
How to help yourself
Two useful gem commands to remember are:
gem help
This shows how to get help with rubygems.
gem help commands
This shows all commands available to rubygems.
From here you can get more specific help on a command by using gem help:
gem help update
sudo gem install gemname
sudo gem update gemname
Okay. I see what you're going for but again try to go abstract because I know someone will give you a direct answer (which people should up-vote over this).
Everyone should get comfortable with man pages. But even if you are, you'll find that these commands lack decent man pages. However, those that do will point you to cmd --help and you will find some decent documentation there. I linked each of the commands above to a hopefully useful resource that will lead you to an answer if you're worried about command line switches. I see someone already posted the commands so I won't repeat those for gem. But I'd go further and say:
sudo gem update [gemname]
The default behavior will update all installed gems.
Also, as a bonus there is a neat gem called cheat. The idea is that instead of typing man cmd you will type cheat cmd and you can get a community editable man page for that command. Or better yet, it doesn't have to be a command, it can be an entire topic. Coincidentally to install cheat you would do:
sudo gem install cheat
And then:
cheat gem
That will list out a "man page" written by users like you about the gem command. The commands that you asked for are on that page. Anyone can add new pages, update existing pages, and contribute to the community. If you're interested here is a quick addition you can make to have autocompletion for the cheat command from the command line.
I know I have long winded answers ;)
Is there a similar command to update Ruby itself?
Alas, no there is not. I'm afraid that if you want to update Ruby itself you will have to either download an installer from the Ruby website, or compile it from source.
I should mention though that compiling from source is very easy and offers developers quite a bit of neat flexibility. You can add a suffix to the generated commands so that you can have standalone Ruby 1.8 and Ruby 1.9 builds both at the same time. That can be very helpful for testing.
Finally, its always a danger to update an operating systems built in commands unless it occurs through an official update. Installed applications may be expecting to a Ruby 1.8 in the standard location and crash if they meet an updated version. Any updates you make should just not overwrite one that came with an OS. (If any app crashes then its the fault of the app's developers for not specifying the absolute path to the OS version).
#John Topley: Thanks. Is there a
similar command to update Ruby itself?
Not really. You don't say which operating system you're using. I use Mac OS X and tend to build Ruby from source.