Blog Entries tagged "til"

Enable Spell Checking in Vim for Markdown and Git Commit Messages

October 21, 2019

I had a ridiculous typo in a Git commit message recently, so I decided to explore spell checking in Vim. As it turns out, it’s extremely easy. I only wanted it enabled for Git commit messages and markdown, so I added the following to my vimrc / init.vim: <div class="highlight"><pre class="highlight viml"><code>" Spell-check Markdown files and Git Commit Messages autocmd FileType markdown setlocal spell autocmd FileType gitcommit setlocal spell </code></pre></div> By doing this, it highlights potential misspellings in red underline. You can see a list of potential corrections by moving the cursor over the word in normal mode and...

Quickly Convert 4 Spaces (or Tabs) to 2 spaces in Vim

October 19, 2019

Here’s a handy Vim command that I find myself searching for often. It could easily be made into a function in your vimrc. <div class="highlight"><pre class="highlight viml"><code>" 4 spaces to 2 spaces %s;^\(\s\+\);\=repeat(' ', len(submatch(0))/2);g " Tab to 2 spaces %s/\t/ /g </code></pre></div>

#til #vim

Get the Previous Expression Value in IEx

September 9, 2019

When using Elixir, I’ve long missed the special <code>_</code> helper from <a href="https://en.wikipedia.org/wiki/Interactive_Ruby_Shell">irb</a> that returns the result of the previous expression. Sometimes I actually type it out of pure habit. Little did I know that Elixir has the same thing, except better. IEx.Helpers has a function <code>v(n \\ -1)</code> that returns the value of the nth expression in the session history. So <code>v</code> alone returns the previous expression and <code>v(-2)</code> returns the one before it. <div class="highlight"><pre class="highlight elixir"><code>iex(1)> "abc" iex(2)> "zyx" iex(3)> v "zyx" iex(4)> v(-3) "abc" </code></pre></div>

#elixir #til

Ruby Symbol and String Array Shorthand

August 27, 2019

Ruby has some handy Array shorthands, but I always forget which is which, so I thought I should write them down. <h3 id="symbol-array-shorthand">Symbol Array Shorthand:</h3> <div class="highlight"><pre class="highlight ruby"><code>%i{foo bar} # => [:foo, :bar] </code></pre></div> <h3 id="string-array-shorthand">String Array Shorthand:</h3> <div class="highlight"><pre class="highlight ruby"><code>%w{foo bar} # => ["foo", "bar"] </code></pre></div> Both also work with square brackets <code>%w[a b c]</code> or parenthesis <code>%i(a b c)</code>

#til #ruby

SSH Tunnels into Production Rails Database

July 25, 2019

Today I needed to access a production database for my Rails app directly using a GUI application on my mac, so I figured out that this can be done by creating an SSH tunnel like so: <div class="highlight"><pre class="highlight shell"><code>ssh -Ng -L <local-port>:<remote-host>:<remote-port> <user>@<remote-host> ssh -Ng -L 3307:100.64.26.11:3307 adam@100.64.26.11 </code></pre></div> And then, in your Rails app, update the database.yml as if you were connecting to a local database, but specify the proper database name. <div class="highlight"><pre class="highlight yaml"><code>development: adapter: mysql2 database: myapp_production host: 127.0.0.1 port: 3307 username: root password</code></pre></div>

Rails presence method

July 24, 2019

I use Rails’ <code>present?</code> method constantly, but recently I stumbled across the <code>presence</code> method. In the past, I have often found myself doing the following because params[:foo] could be nil or a blank string. <div class="highlight"><pre class="highlight ruby"><code>foo = params[:foo].present? ? params[:foo] : "something else" </code></pre></div> I hate that i have to write <code>params[:foo]</code> twice. But the <code>presence</code> method is handy for this case. It returns nil if the item is nil or a blank string, but otherwise returns the value. <div class="highlight"><pre class="highlight ruby"><code>foo = params[:foo].presence || "something-else" </code></pre></div>

#til #ruby #rails

TIL: Pass in an ActiveRecord Object to a where string

July 22, 2019

I’m surprised I didn’t already know this, but if you have an ActiveRecord <code>where</code> statement that references an id column, you can just pass in an object and it will pass in the object’s id, not the string representation of the object. <div class="highlight"><pre class="highlight ruby"><code>company = Company.find(1) User.where("users.company_id = ?", company) # is equal to User.where("users.company_id = ?", company.id) </code></pre></div> So when you create named scopes, you don’t have to do the song-and-dance where you check to see if the object is a model or an integer, as shown below. <div class="highlight"><pre class="highlight ruby"><code>scope :by_company, lambda { |company| ...</code></pre></div>

Lookup IP Address & Location via the Command Line

July 21, 2019

With <a href="https://ifconfig.co">ifconfig.co</a>, you can lookup your external IP Address and Location Information using a simple curl command. You can use it like so: <div class="highlight"><pre class="highlight shell"><code>$ curl ifconfig.co/json { "ip": "96.27.202.202", "ip_decimal": 1612409628, "country": "United States", "country_iso": "US", "city": "Columbus", "hostname": "d27-96-101-101.nap.wideopenwest.com" } $ curl ifconfig.co/city Columbus $ curl ifconfig.co/country United States </code></pre></div>

#til #command-line