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הוס ווית' מי ?

about (this) - ruby documents at your fingertips

Ever wanted to know more about a function while using console or irb ?
I included this method in my "hellpers.rb"© file and load it in ~/.irbrc

def about(this=nil)
(this || puts("Enter value to research:"))
system "ri #{this || gets}"
end

so now simply type: about "Time.now" and see what happens.
you can also just enter "about" and then it will prompt you "Enter value to research:"


hit 'q' to exit and go back to console/irb

enjoy :)

Autocomplete in IRB

Want to enjoy the same "auto-complete" rails enables in the console, but in irb ?

Simply edit ~/.irbrc to include the following:

shmueli@shmueli-desktop:~$ cat ~/.irbrc

IRB.conf[:AUTO_INDENT] = true
IRB.conf[:USE_READLINE] = true
IRB.conf[:LOAD_MODULES] = [] unless IRB.conf.key?(:LOAD_MODULES)
unless IRB.conf[:LOAD_MODULES].include?('irb/completion')
IRB.conf[:LOAD_MODULES] << 'irb/completion'
end

and voila!! now just tap twice the TAB key and see what happens.

for example:

irb(main):001:0> String.n[TAB-TAB]
String.name String.new String.nil?
irb(main):001:0> String.n

add path to irb - ruby load path

Ruby Load path is accessed every time you call a file. (i.e require 'hellpers').
It searches by the Array's cell order until it finds the file.

Type "$:" to get your Ruby Load Path.
irb(main):002:0> $:
=> ["/usr/local/lib/site_ruby/1.8", "/usr/local/lib/site_ruby/1.8/i486-linux", "/usr/local/lib/site_ruby/1.8/i386-linux", "/usr/local/lib/site_ruby", "/usr/lib/ruby/1.8", "/usr/lib/ruby/1.8/i486-linux", "/usr/lib/ruby/1.8/i386-linux", "."]
irb(main):002:0> $:.push '~/bin'

if you want it to automatically load each time you run irb,
you will need to edit ~/.irbrc

shmueli@shmueli-desktop:~$ cat .irbrc

$:.push '~/bin'

How to make a ruby script "executable" ?

Its very simple,just follow these simple steps:

Create a directory to include all your scripts if don't already have one:
shmueli@shmueli-desktop:~$ mkdir ~/bin

Add the directory to the environment's PATH:
shmueli@shmueli-desktop:~$ pico ~/.bashrc

export PATH='/usr/bin...~/bin'

shmueli@shmueli-desktop:~$ which ruby

/usr/bin/ruby

shmueli@shmueli-desktop:~$ pico ~/bin/hello_world

#!/usr/bin/ruby
puts `hello world`

shmueli@shmueli-desktop:~$ chmod +x hello_world

shmueli@shmueli-desktop:~$ hello_world
hello world


enjoy :)

please leave a comment, if you have any remarks.