Running a JSON API with Rack and mruby on a Raspberry Pi
I recently got a Raspberry Pi 2 so I wanted to experiment with home automation, surveillance system, movement detection and stuff like that.
Posts by Tags
API
ActiveModel
Validating Plain Ruby Objects with ActiveModel
You don’t need a database table to get Rails-style validations. With ActiveModel you can validate plain Ruby objects (a contact form, a search form, an API p...
Algorithm
Prime Target: Generating Prime Numbers in Elixir
A few ways to generate prime numbers in Elixir, from a naive check to a recursive sieve, a lazy infinite stream, and a parallel version with Task.async_strea...
Android
Loading shared library in Android using RubyMotion
Using a vendor library may require to load a shared library. Here’s how to do it in RubyMotion.
Force screen orientation in Android using RubyMotion
As you may know since a couple of month you can write native Android apps using RubyMotion.
Best Practices
How to use infinity in your code
You’ll sometimes have to use the notion of infinity in your Ruby code. There isn’t any way to directly use infinity in Ruby, at least none that I know of… Bu...
Default stack for Ruby projects
Having a clear and well-defined default stack when you start a new project is a good thing — it will have an impact on your productivity and happiness. I’ll ...
CLI
Thor - a command-line scripting tool
Thor is a simple and efficient tool for building self-documenting command line utilities. I’m a shell guy, I use a terminal everyday and most of my job is do...
Debug
Easily add a lightweight logging system to your Ruby app
Sometimes it can be very useful to add verbose and silent modes to your app. This way users can easily control information level about events happening. As y...
Design
Return Data, Not ActiveRecord Objects
Why returning plain data instead of models made some of my Rails code simpler, faster and easier to test.
Doom Emacs
Not Quite Vim: Switching to Evil in Doom Emacs
I moved to Doom Emacs and disabled Evil out of habit. Later I gave its Vim bindings a real chance. The grammar fought me for a while, then it clicked, and it...
ET
Dialogue with Artificial Intelligence: Extraterrestrial Life and Saving Our Planet
In this article, I engage in a conversation with ChatGPT to explore the possibility of extraterrestrial life and the pressing need to preserve our planet. We...
Earth
Dialogue with Artificial Intelligence: Extraterrestrial Life and Saving Our Planet
In this article, I engage in a conversation with ChatGPT to explore the possibility of extraterrestrial life and the pressing need to preserve our planet. We...
Editor
Setting up multiple IMAP and SMTP accounts in Gnus
When it comes to Emacs and emails reading, one of the most popular options is Gnus. Let’s see how to configure it for multiple IMAP / SMTP servers without us...
Easily insert Elixir pipe operator in Emacs
When writing Elixir code you’ll often find yourself typing the pipe operator which is not very convinient. Let’s see how to ease this in Emacs.
Emacs Tramp lag and timeout
You’re experiencing excessive lag and timeouts when using Tramp on remote servers through SSH. Here is the solution to one of the most common cause.
How to solve Textmate slowdown on focus
On Friday I was having slowdowns on Textmate focus. I never had this problem before and this “bug” was only happening on this given project. I had to wait fo...
Elasticsearch
Before Adding Elasticsearch, Find the Bottleneck
Years ago I added Elasticsearch to a Rails app and search got faster. I credited the search engine. Looking back, I’m not sure that was the lesson. Here is h...
Elixir
The State of Typing in Elixir
Elixir is dynamically typed, but ‘typing in Elixir’ now spans three things: the runtime shape you get from pattern matching and structs, optional typespecs c...
Phoenix LiveView: Interactive Apps Without Writing JavaScript
Phoenix LiveView handles real-time interactivity on the server, so you can build interactive pages without writing a frontend framework. Here’s a small task ...
Prime Target: Generating Prime Numbers in Elixir
A few ways to generate prime numbers in Elixir, from a naive check to a recursive sieve, a lazy infinite stream, and a parallel version with Task.async_strea...
Building an Elixir API with Plug Only
You don’t always need Phoenix. For a small API, Plug alone gives you full control over requests and responses with almost no machinery. Here’s a JSON endpoin...
Easily insert Elixir pipe operator in Emacs
When writing Elixir code you’ll often find yourself typing the pipe operator which is not very convinient. Let’s see how to ease this in Emacs.
Scheduling tasks without external dependencies in Elixir
Elixir and Erlang comes with so much tooling that most of the time you’ll be able to do what you need to without having to depend on any external software.
GenServer with supervision tree and state recovery after crash
You’ve probably heard that in Elixir you should let processes crash rather than trying to catch every possible exceptions. Then, after a crash, you only have...
Adding additional translations in Phoenix using Gettext
Sometimes when you’re writing a Phoenix app you want to split your translation files to avoid having one big file with everything inside but rather having on...
Emacs
emacs-mailto: Open macOS mailto: Links in Emacs
The GNU Emacs NS port doesn’t handle mailto: links on macOS: click one while Emacs is running and nothing happens. emacs-mailto is a tiny relay app that fixe...
shpaste: a paste.sr.ht Client for Emacs
shpaste is a small Emacs client for paste.sr.ht. Create a paste from a region or a whole buffer, get the URL straight in your kill-ring, and browse or delete...
Sign Always, Encrypt When Possible: Automatic GPG in mu4e
GPG only protects the emails you actually remember to protect. Instead of toggling signing and encryption by hand before every send, mu4e can do it for me: s...
Not Quite Vim: Switching to Evil in Doom Emacs
I moved to Doom Emacs and disabled Evil out of habit. Later I gave its Vim bindings a real chance. The grammar fought me for a while, then it clicked, and it...
Using auth-source in a Real Emacs Package
When an Emacs package needs an API token, the easy path is to introduce a custom variable and let users store the secret in their configuration. shpaste take...
Setting up multiple IMAP and SMTP accounts in Gnus
When it comes to Emacs and emails reading, one of the most popular options is Gnus. Let’s see how to configure it for multiple IMAP / SMTP servers without us...
Easily insert Elixir pipe operator in Emacs
When writing Elixir code you’ll often find yourself typing the pipe operator which is not very convinient. Let’s see how to ease this in Emacs.
Emacs Tramp lag and timeout
You’re experiencing excessive lag and timeouts when using Tramp on remote servers through SSH. Here is the solution to one of the most common cause.
Evil
Not Quite Vim: Switching to Evil in Doom Emacs
I moved to Doom Emacs and disabled Evil out of habit. Later I gave its Vim bindings a real chance. The grammar fought me for a while, then it clicked, and it...
Full-Text Search
Full-Text Search in Rails with PostgreSQL
Before reaching for Elasticsearch, it’s worth knowing that PostgreSQL has capable full-text search built in. Here’s how to use it from a Rails app — tokenizi...
GPG
Sign Always, Encrypt When Possible: Automatic GPG in mu4e
GPG only protects the emails you actually remember to protect. Instead of toggling signing and encryption by hand before every send, mu4e can do it for me: s...
Git
Replace a branch with another one in a Git repository
Last week a workmate did me a pull request where he wanted to merge a fully new “develop” branch into “master”. The thing was that he realized that he has to...
Gnus
Setting up multiple IMAP and SMTP accounts in Gnus
When it comes to Emacs and emails reading, one of the most popular options is Gnus. Let’s see how to configure it for multiple IMAP / SMTP servers without us...
Hanakai
Hanakai, and Hanami 3.0 in Full Bloom
Hanami, dry and rom have joined forces as Hanakai, a single family of Ruby tools. The first release under that banner is Hanami 3.0: built-in mailers and i18...
Hanami
Hanakai, and Hanami 3.0 in Full Bloom
Hanami, dry and rom have joined forces as Hanakai, a single family of Ruby tools. The first release under that banner is Hanami 3.0: built-in mailers and i18...
Hanami 2 Is Finally Full-Stack
Hanami 2 arrived in three acts: the app rewrite in 2.0, views in 2.1, and a full ROM-based database layer in 2.2. With that last piece, it’s a complete full-...
Using I18n with Hanami
Last week I wrote about settings up Sikekiq in Hanami. Another gem I often use is I18n since it allows to localize strings and keep them separated from my co...
Using Sidekiq with Hanami
One of the gems I often use in my Ruby on Rails projects is Sikekiq. For those of you who don’t know about it, it allows to easily manage background processes.
I18n
Adding additional translations in Phoenix using Gettext
Sometimes when you’re writing a Phoenix app you want to split your translation files to avoid having one big file with everything inside but rather having on...
Translating ActiveRecord data using JSON
Following the mass and using de-facto libraries isn’t always the best choice. Here are some thoughts about handling translation of data stored in database wh...
Using I18n with Hanami
Last week I wrote about settings up Sikekiq in Hanami. Another gem I often use is I18n since it allows to localize strings and keep them separated from my co...
IA
Dialogue with Artificial Intelligence: Extraterrestrial Life and Saving Our Planet
In this article, I engage in a conversation with ChatGPT to explore the possibility of extraterrestrial life and the pressing need to preserve our planet. We...
Lib
I18nFloat - Allow comma style decimals for ActiveRecord attributes
I18nFloat is a Ruby gem to use with Rails. I18nFloat allows your users to use format number like “1 200,84” in forms. ActiveRecord Float attributes don’t car...
Googlus - A Ruby wrapper around Google URL Shortener API
Googlus is a Ruby wrapper around Google URL Shortener REST API.
LiveView
Phoenix LiveView: Interactive Apps Without Writing JavaScript
Phoenix LiveView handles real-time interactivity on the server, so you can build interactive pages without writing a frontend framework. Here’s a small task ...
Logging
Easily add a lightweight logging system to your Ruby app
Sometimes it can be very useful to add verbose and silent modes to your app. This way users can easily control information level about events happening. As y...
Mac OS
Set system-wide PATH environment variable for Mac OS GUI apps
A lot of people struggles to find how to instruct their Mac OS GUI apps to be aware of their PATH environment variable. Sometimes when you install GUI apps t...
OS X
Pow using rbenv
Couple weeks ago I switched from RVM to rbenv because I think it’s a cleaner and faster way to handle Ruby versions. It is more respecful of the Unix philoso...
OTP
Scheduling tasks without external dependencies in Elixir
Elixir and Erlang comes with so much tooling that most of the time you’ll be able to do what you need to without having to depend on any external software.
Open Source
emacs-mailto: Open macOS mailto: Links in Emacs
The GNU Emacs NS port doesn’t handle mailto: links on macOS: click one while Emacs is running and nothing happens. emacs-mailto is a tiny relay app that fixe...
shpaste: a paste.sr.ht Client for Emacs
shpaste is a small Emacs client for paste.sr.ht. Create a paste from a region or a whole buffer, get the URL straight in your kill-ring, and browse or delete...
I18nFloat - Allow comma style decimals for ActiveRecord attributes
I18nFloat is a Ruby gem to use with Rails. I18nFloat allows your users to use format number like “1 200,84” in forms. ActiveRecord Float attributes don’t car...
Googlus - A Ruby wrapper around Google URL Shortener API
Googlus is a Ruby wrapper around Google URL Shortener REST API.
Performance
Before Adding Elasticsearch, Find the Bottleneck
Years ago I added Elasticsearch to a Rails app and search got faster. I credited the search engine. Looking back, I’m not sure that was the lesson. Here is h...
Phoenix
Phoenix LiveView: Interactive Apps Without Writing JavaScript
Phoenix LiveView handles real-time interactivity on the server, so you can build interactive pages without writing a frontend framework. Here’s a small task ...
Adding additional translations in Phoenix using Gettext
Sometimes when you’re writing a Phoenix app you want to split your translation files to avoid having one big file with everything inside but rather having on...
Plug
Building an Elixir API with Plug Only
You don’t always need Phoenix. For a small API, Plug alone gives you full control over requests and responses with almost no machinery. Here’s a JSON endpoin...
PostgreSQL
Before Adding Elasticsearch, Find the Bottleneck
Years ago I added Elasticsearch to a Rails app and search got faster. I credited the search engine. Looking back, I’m not sure that was the lesson. Here is h...
Full-Text Search in Rails with PostgreSQL
Before reaching for Elasticsearch, it’s worth knowing that PostgreSQL has capable full-text search built in. Here’s how to use it from a Rails app — tokenizi...
Rails
Return Data, Not ActiveRecord Objects
Why returning plain data instead of models made some of my Rails code simpler, faster and easier to test.
Before Adding Elasticsearch, Find the Bottleneck
Years ago I added Elasticsearch to a Rails app and search got faster. I credited the search engine. Looking back, I’m not sure that was the lesson. Here is h...
Rails 8 Wants You to Own Your Stack
Rails 8 isn’t really a bag of new methods. Its headline is a stance: drop Redis, drop the PaaS, and run a real app from a single box you own — with the datab...
Practical Service Objects in Ruby
Service objects keep business logic out of fat controllers and models. A handful of conventions (one entry point, a consistent return value, a simple constru...
Validating Plain Ruby Objects with ActiveModel
You don’t need a database table to get Rails-style validations. With ActiveModel you can validate plain Ruby objects (a contact form, a search form, an API p...
Full-Text Search in Rails with PostgreSQL
Before reaching for Elasticsearch, it’s worth knowing that PostgreSQL has capable full-text search built in. Here’s how to use it from a Rails app — tokenizi...
The Rails 7.1 Features I Actually Reach For
Rails 7.1 isn’t a headline release. It’s a pile of quality-of-life additions that quietly remove boilerplate you write all the time — normalizing attributes,...
Rails console tips
Knowing how to use the Rails console can be very useful when debugging or trying your snippets. Being proficient with it will increase your productivity.
Translating ActiveRecord data using JSON
Following the mass and using de-facto libraries isn’t always the best choice. Here are some thoughts about handling translation of data stored in database wh...
Release
I18nFloat - Allow comma style decimals for ActiveRecord attributes
I18nFloat is a Ruby gem to use with Rails. I18nFloat allows your users to use format number like “1 200,84” in forms. ActiveRecord Float attributes don’t car...
Googlus - A Ruby wrapper around Google URL Shortener API
Googlus is a Ruby wrapper around Google URL Shortener REST API.
Ruby
Hanakai, and Hanami 3.0 in Full Bloom
Hanami, dry and rom have joined forces as Hanakai, a single family of Ruby tools. The first release under that banner is Hanami 3.0: built-in mailers and i18...
Return Data, Not ActiveRecord Objects
Why returning plain data instead of models made some of my Rails code simpler, faster and easier to test.
Before Adding Elasticsearch, Find the Bottleneck
Years ago I added Elasticsearch to a Rails app and search got faster. I credited the search engine. Looking back, I’m not sure that was the lesson. Here is h...
Rails 8 Wants You to Own Your Stack
Rails 8 isn’t really a bag of new methods. Its headline is a stance: drop Redis, drop the PaaS, and run a real app from a single box you own — with the datab...
Five dry-rb Gems Worth Knowing
A short tour of five dry-rb gems I keep coming back to: validation, types, structs, configuration, and composable business logic. Small, focused libraries th...
Practical Service Objects in Ruby
Service objects keep business logic out of fat controllers and models. A handful of conventions (one entry point, a consistent return value, a simple constru...
Validating Plain Ruby Objects with ActiveModel
You don’t need a database table to get Rails-style validations. With ActiveModel you can validate plain Ruby objects (a contact form, a search form, an API p...
Full-Text Search in Rails with PostgreSQL
Before reaching for Elasticsearch, it’s worth knowing that PostgreSQL has capable full-text search built in. Here’s how to use it from a Rails app — tokenizi...
Hanami 2 Is Finally Full-Stack
Hanami 2 arrived in three acts: the app rewrite in 2.0, views in 2.1, and a full ROM-based database layer in 2.2. With that last piece, it’s a complete full-...
The Rails 7.1 Features I Actually Reach For
Rails 7.1 isn’t a headline release. It’s a pile of quality-of-life additions that quietly remove boilerplate you write all the time — normalizing attributes,...
Creating a deeply nested Hash in Ruby
Sometimes you’ll have to create a deeply nested hash without knowing how deep it can be at first. This hash should allow reading and setting values at any le...
Ruby one-liners for file manipulations
Most people using Ruby nowdays are using it for Rails. They often defined themselves has ‘Rails developers’, not ‘Ruby developers’. I’m an early adopter of R...
RubyMotion
Downgrading RubyMotion
Sometimes after upgrading RubyMotion I face some bugs introduced in the new release. It can be bugs which can easily be worked around or really annoying bugs...
Loading shared library in Android using RubyMotion
Using a vendor library may require to load a shared library. Here’s how to do it in RubyMotion.
Force screen orientation in Android using RubyMotion
As you may know since a couple of month you can write native Android apps using RubyMotion.
SSH
Emacs Tramp lag and timeout
You’re experiencing excessive lag and timeouts when using Tramp on remote servers through SSH. Here is the solution to one of the most common cause.
Security
Sign Always, Encrypt When Possible: Automatic GPG in mu4e
GPG only protects the emails you actually remember to protect. Instead of toggling signing and encryption by hand before every send, mu4e can do it for me: s...
Using auth-source in a Real Emacs Package
When an Emacs package needs an API token, the easy path is to introduce a custom variable and let users store the secret in their configuration. shpaste take...
Service Objects
Return Data, Not ActiveRecord Objects
Why returning plain data instead of models made some of my Rails code simpler, faster and easier to test.
SourceHut
shpaste: a paste.sr.ht Client for Emacs
shpaste is a small Emacs client for paste.sr.ht. Create a paste from a region or a whole buffer, get the URL straight in your kill-ring, and browse or delete...
Streams
Prime Target: Generating Prime Numbers in Elixir
A few ways to generate prime numbers in Elixir, from a naive check to a recursive sieve, a lazy infinite stream, and a parallel version with Task.async_strea...
SysAdmin
Automating blog update using SourceHut builds
Let’s see how SourceHut helped me to automate my blog updates.
Ruby one-liners for file manipulations
Most people using Ruby nowdays are using it for Rails. They often defined themselves has ‘Rails developers’, not ‘Ruby developers’. I’m an early adopter of R...
Setting up Rails, Nginx and Puma
When Rails 4 was released it offered a bunch new features and deprecations :
Capistrano using Mercurial (a.k.a Hg)
As you may notice I’m a big fan of Mercurial which is a great DSCM a lot more easier to learn and use than Git in my opinion.
Chef - Setup remote server seamlessly
Chef is a Ruby Gem which aims to help sys admins in the process of managing servers.
Pow using rbenv
Couple weeks ago I switched from RVM to rbenv because I think it’s a cleaner and faster way to handle Ruby versions. It is more respecful of the Unix philoso...
Tips
Automating blog update using SourceHut builds
Let’s see how SourceHut helped me to automate my blog updates.
Creating a deeply nested Hash in Ruby
Sometimes you’ll have to create a deeply nested hash without knowing how deep it can be at first. This hash should allow reading and setting values at any le...
Set system-wide PATH environment variable for Mac OS GUI apps
A lot of people struggles to find how to instruct their Mac OS GUI apps to be aware of their PATH environment variable. Sometimes when you install GUI apps t...
Ruby one-liners for file manipulations
Most people using Ruby nowdays are using it for Rails. They often defined themselves has ‘Rails developers’, not ‘Ruby developers’. I’m an early adopter of R...
How to use infinity in your code
You’ll sometimes have to use the notion of infinity in your Ruby code. There isn’t any way to directly use infinity in Ruby, at least none that I know of… Bu...
Encapsulate a code block in an object
Ruby is a very dynamic language which allows you to do things like encapsulate a piece of code in an object. This is a really powerful capability you can use...
Easily add a lightweight logging system to your Ruby app
Sometimes it can be very useful to add verbose and silent modes to your app. This way users can easily control information level about events happening. As y...
Typing
The State of Typing in Elixir
Elixir is dynamically typed, but ‘typing in Elixir’ now spans three things: the runtime shape you get from pattern matching and structs, optional typespecs c...
Vim
Not Quite Vim: Switching to Evil in Doom Emacs
I moved to Doom Emacs and disabled Evil out of habit. Later I gave its Vim bindings a real chance. The grammar fought me for a while, then it clicked, and it...
Web
Effectivly manage a static website with Nanoc
Couple months ago I was working on my personal website that I decided to re-write from scratch since most of the existing things had to be scratched off and ...
auth-source
Using auth-source in a Real Emacs Package
When an Emacs package needs an API token, the easy path is to introduce a custom variable and let users store the secret in their configuration. shpaste take...
dry-rb
Five dry-rb Gems Worth Knowing
A short tour of five dry-rb gems I keep coming back to: validation, types, structs, configuration, and composable business logic. Small, focused libraries th...
macOS
emacs-mailto: Open macOS mailto: Links in Emacs
The GNU Emacs NS port doesn’t handle mailto: links on macOS: click one while Emacs is running and nothing happens. emacs-mailto is a tiny relay app that fixe...
mailto
emacs-mailto: Open macOS mailto: Links in Emacs
The GNU Emacs NS port doesn’t handle mailto: links on macOS: click one while Emacs is running and nothing happens. emacs-mailto is a tiny relay app that fixe...
mu4e
Sign Always, Encrypt When Possible: Automatic GPG in mu4e
GPG only protects the emails you actually remember to protect. Instead of toggling signing and encryption by hand before every send, mu4e can do it for me: s...
shpaste
shpaste: a paste.sr.ht Client for Emacs
shpaste is a small Emacs client for paste.sr.ht. Create a paste from a region or a whole buffer, get the URL straight in your kill-ring, and browse or delete...