Kamiflex 1.0

A standalone Ruby DSL for LINE Flex message hashes and JSON. Requires Ruby 3.3+; tested for the Kamigo 1.0 / Ruby 4 upgrade. No Rails dependency.

Kamiflex.hash do
  alt_text "Your inventory"
  bubble do
    body do
      text "Tickets: 10"
    end
  end
end

hash / to_hash return a Ruby Hash. build / json return formatted JSON; compact_json returns compact JSON. JSON is generated by the JSON library, never by interpolating text into JSON templates.

Each call allocates a separate builder. An optional argument supplies public helper methods (Kamiflex.hash(view_context) { ... }). The caller's class and instance state are not modified. Capture data in local variables or expose a public helper; the block runs against the builder, so the caller's instance variables and private methods are not implicitly available. Helpers themselves remain responsible for their own thread safety.

Breaking changes from 0.x: no caller class mixins, no implicit instance-variable context, and no global LINE MIME registration. The hosting framework owns MIME registration. Do not share a manually instantiated mutable Builder across threads; use the module entry points.

Run ruby -Ilib test/kamiflex_test.rb or bundle exec rake test. The old examples below describe the available message elements; use the new optional-context entry point for fresh code.

---

Kamiflex

Kamiflex provide a pretty DSL to build your flex message of line messaging api like this:

Document

https://etrex.tw/kamigo/05_kamiflex.html

Live Demo

Kamiflex Simulator

in pure ruby

example/cards.rb

require 'kamiflex'

@products = [
  {
    name: "kamigo",
    star: 4,
    place: "https://github.com/etrex/kamigo",
    time: "10:00 - 23:00",
    contact_url: "https://github.com/etrex/kamigo",
    product_url: "https://github.com/etrex/kamigo"
  },
  {
    name: "kamiliff",
    star: 3,
    place: "https://github.com/etrex/kamiliff",
    time: "11:00 - 23:00",
    contact_url: "https://github.com/etrex/kamiliff",
    product_url: "https://github.com/etrex/kamiliff"
  },
  {
    name: "kamiflex",
    star: 5,
    place: "https://github.com/etrex/kamiflex",
    time: "09:00 - 23:00",
    contact_url: "https://github.com/etrex/kamiflex",
    product_url: "https://github.com/etrex/kamiflex"
  },
]

def star(num)
  baseline_box margin: :md do
    (0...num).each do
      icon "https://scdn.line-apps.com/n/channel_devcenter/img/fx/review_gold_star_28.png", size: :sm
    end
    (num...5).each do
      icon "https://scdn.line-apps.com/n/channel_devcenter/img/fx/review_gray_star_28.png", size: :sm
    end
    text "#{num}.0", size: :sm, color: "#999999", margin: :md, flex: 0
  end
end

def field(key, value)
  baseline_box spacing: :sm do
    text key, "color":"#aaaaaa","size":"sm","flex":1
    text value, "wrap":true,"color":"#666666","size":"sm","flex":5
  end
end

json = Kamiflex.build(self) do
  carousel do
    bubbles @products do |product|
      hero "https://scdn.line-apps.com/n/channel_devcenter/img/fx/01_1_cafe.png",
        size: :full, aspectRatio: "20:13", aspectMode: :cover, action: uri_action("http://linecorp.com/")
      body do
        text product[:name], weight: :bold, size: :xl
        star(product[:star])
        vertical_box margin: :lg, spacing: :sm do
          field "Place", product[:place]
          field "Time", product[:time]
        end
      end
      footer spacing: :sm, flex: 0 do
        url_button "CALL", product[:contact_url], style: :link, height: :sm
        url_button "WEBSITE", product[:product_url], style: :link, height: :sm
        spacer size: :sm
      end
    end
  end
end

puts json

in rails

# todos/index.line.erb
<%= raw Kamiflex.build(self) do
  bubble do
    body do
      horizontal_box do
        text "🍔", flex: 0, action: message_action("/")
        text "Todos"
        text "🆕", align: "end", action: uri_action(new_todo_path)
      end
      separator
      if @todos.present?
        vertical_box margin: "lg" do
          horizontal_box @todos, margin: "lg" do |todo|
            text todo.name, action: message_action("/todos/#{todo.id}")
            text "❌", align: "end", action: message_action("DELETE /todos/#{todo.id}")
          end
        end
      else
        text "no contents yet", margin: "lg"
      end
    end
  end
end %>

I will make a template name flex for rails in the future.

With this template, it's more clear then erb.

# todos/index.line.flex
bubble do
  body do
    horizontal_box do
      text "🍔", flex: 0, action: message_action("/")
      text "Todos"
      text "🆕", align: "end", action: uri_action(new_todo_path)
    end
    separator
    if @todos.present?
      vertical_box margin: "lg" do
        horizontal_box @todos, margin: "lg" do |todo|
          text todo.name, action: message_action("/todos/#{todo.id}")
          text "❌", align: "end", action: message_action("DELETE /todos/#{todo.id}")
        end
      end
    else
      text "no contents yet", margin: "lg"
    end
  end
end

Installation

Add this line to your application's Gemfile:

gem 'kamiflex'

Author

Create by etrex

License

The gem is available as open source under the terms of the MIT License.