Send/write code in Gmail emails

Use this chrome extension to write the code snippet in Markdown, toggle convert snippet to HTML and send. Win! https://chrome.google.com/webstore/detail/markdown-here/elifhakcjgalahccnjkneoccemfahfoa

Checkout version of a file in previous git commit

# This rolls back the diff of the file in the git commit
git checkout COMMIT_SHA FILE

# Commit the file modification (rolled back diff)
git add FILE
git commit -m "Check out previous version of file." 

Get large facebook profile picture from facebook id.

Just use the following url format for your image tag.

http://graph.facebook.com/FACEBOOK_ID/picture?type=large

Crop center and resize paperclip image attachment

  has_attached_file :profile_image,
    storage: :s3,
    s3_credentials: {
      bucket:            Settings.s3_bucket_name,
      access_key_id:     Settings.aws_access_key_id,
      secret_access_key: Settings.aws_secret_access_key
    },
    default_url: '/assets/default_profile_pic.png',
    styles: { square_50: '', square_100: '', square_193: '' },
    convert_options: {
      square_50: '-gravity center -resize 50x50^ -crop 50x50+0+0',
      square_100: '-gravity center -resize 100x100^ -crop 100x100+0+0',
      square_193: '-gravity center -resize 193x193^ -crop 193x193+0+0'
    }

Restart Nginx on OSX

Best to have them as bash aliases.

alias startnginx='sudo /usr/local/Cellar/nginx/1.2.4/sbin/nginx'
alias stopnginx='sudo killall nginx'
alias restartnginx='stopnginx; startnginx'

# If you need to know where's nginx bin
locate nginx

Permission denied (publickey) error when doing cap deploy

I encountered this when trying to do a capistrano deploy on one of client's server. This error means that the server that's trying to fetch from repository on Github does not have permission to do so. We can resolve this with either:

• Adding server's public key to the Github repo's list of deploy keys.
• Use ssh agent forwarding so Github thinks it's you who's doing the deploy.

If ssh-agent isn't running, run the following in terminal.

exec ssh-agent bash