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Nikola Brežnjak blog - Tackling software development with a dose of humor
Linux, Quick tips

Installing CasperJS on RHEL Linux distribution

First you have to install NodeJS. You can do that via package manager for your distribution. In my case (RHEL) it is easily done with:

sudo yum install nodejs npm --enablerepo=epel

Installing CasperJS is easy via npm (Node package manager):

sudo npm install -g casperjs

You will get output similar to this:

Copying extracted folder /usr/lib/node_modules/casperjs/node_modules/phantomjs/phantomjs/phantomjs-1.9.7-linux-x86_64.tar.bz2-extract-1396259124118/phantomjs-1.9.7-linux-x86_64 -> /usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom
Writing location.js file
Done. Phantomjs binary available at /usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom/bin/phantomjs
/usr/bin/casperjs -> /usr/lib/node_modules/casperjs/bin/casperjs
npm WARN unmet dependency /usr/lib/node_modules/block-stream requires inherits@'~2.0.0' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/fstream requires inherits@'~2.0.0' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/fstream-ignore requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/fstream-npm requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/glob requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/npmconf requires inherits@'~2.0.0' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/tar requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
[email protected] /usr/lib/node_modules/casperjs
âââ [email protected] ([email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected])
[[email protected] ~]$ casperjs
Fatal: [Errno 2] No such file or directory; did you install phantomjs?
[[email protected] ~]$ /usr/bin/casperjs
Fatal: [Errno 2] No such file or directory; did you install phantomjs?
[[email protected] ~]$ /usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom/bin/phantomjs
phantomjs>
[[email protected] ~]$ /usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom/bin/phantomjs --version
1.9.7

To have the binaries in my path every time I log in I added this alias to my .bashrc:

alias phantomset="export PATH=$PATH:/usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom/bin/"

and my .bash_profile looks like this:

# User specific environment and startup programs
PATH=$PATH:$HOME/bin
export PATH
phantomset
Quick tips

Console 2 arrow keys not working

All of a sudden my arrow keys stopped working - up  and down keys scrolled the screen up and down, while left and right  had no effect. I found the solution here and basically all that you have to do is disable Scroll Lock on your keyboard! Pretty weird stuff, if I may add...

Quick tips

Customize Console 2 on Windows machine

If you're using Console 2, and I don't know why you wouldn't want to btw, you probably wanted to customize it. Here is an excellent post by Scott Hanselman on how to do it:http://www.hanselman.com/blog/Console2ABetterWindowsCommandPrompt.aspx.

To change settings you have to right-click in the main console and click Edit | Settings.

The settings that I have used from his blog are:

  • I've set Desktop as my startup directory under Console - Startup Directory
  • I hid the menu, status bar and toolbar under Appearance | More
  • I've set the font to Consolas, but font only 12, as 15 (as he suggests) looks way too big on my screen. No experimentation with matrix colors or transparency.
  • I've set the option so that when I select with the mouse the selection gets coppied into the clipboard by selecting "Copy on Select" under Behavior
  • Hotkeys, changed the New Tab 1 hotkey to Ctrl-T
  • Hotkeys, changed Paste to Ctrl-V
  • Do not use Ctrl-C as Copy Selection or you will not be able to break some command that keeps running after you run it (like grunt for example). And besides if you used my settings then you already have a "Copy on Select" option set. More info here: http://sourceforge.net/p/console/bugs/401/

edit (18.3.2014): So, it turned out I wanted to be matrix cool :), so I went to change the color of the font, but to no avail. Finally I figured out that actually the grey color needed to be changed to green and not white as I was doing. Here's an image to make thing clearer:
console2_color

Quick tips

Git push origin master could not read username for http://github.com

If you clone your project on another computer and try to do:

git push origin master

and you get and error like:

fatal: could not read Username for 'https://github.com': No such file or directory

then you can solve this by executing the following command:

git remote set-url origin [email protected]:username/repo.git

where, of course,username  and repo  depend on your settings.

For more info, check this StackOverflow question.

 

NodeJS, Quick tips

How to use nodemon

Nodemon is a utility that will monitor for any changes in your source and automatically restart your server. Perfect for development. Install it using npm.

npm install -g nodemon

Once installed, instead of node app.js  use nodemon app.js . It will save you a lot of time in the long run, because you won't need to manually restart the server each time you make a change.

edit: These days I'm using a ever so slightly more popular PM2.

Quick tips, Sublime Text, Windows

How to use JSHint in Sublime Text on Windows machine

Since this is in the "quick tips" category I won't go into what Sublime Text is, or why using JSHint is recommended, and that for it's installation you need Node.js, I will just state the shortest possible path in how to install it, as I had some problems in doing this in a timely fashion:

//install jshint via npm
npm install jshint -g

In Sublime Text install JSHint Gutter via package manager.

And now, finally, since I'm on a windows machine, the problem was that once I got all this installed I had to set the Node.js path in JSHint Gutter plugin but with setting the absolute path to node.exe by using forward slashes:

{
  // Simply using `node` without specifying a path sometimes doesn't work :(
  // https://github.com/victorporof/Sublime-JSHint#oh-noez-command-not-found
  // http://nodejs.org/#download
  "node_path": "C:/Program Files/nodejs/",

  // Automatically lint on edit (Sublime Text 3 only).
  "lint_on_edit": false,

  // Automatically lint when a file is saved.
  "lint_on_save": true,

  // Highlight problematic regions when selected.
  "highlight_selected_regions": false
}
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