Text Interpolator - Simple library for interpolation of variables inside the text.

Introduction

You have few options in ruby for variables interpolation:

• interpolation inside string:

var1 = 'some value 1'
var2 = 'some value 2'

result = "We have var1: #{var1} and var2: #{var2}."

puts result # We have var1: some value 1 and var2: some value 2.

• interpolation inside file (with embedded ruby - erb):

# some_template.erb

We have var1: <%= var1 %> and var2:  <%= var2%>.

# test.rb

require 'erb'

var1 = 'some value 1'
var2 = 'some value 2'

template = ERB.new(File.read("some_template.erb"))

result = template.result(binding)

puts result # We have var1: some value 1 and var2: some value 2.

This library can be used for interpolation inside file with string syntax.

In order to achieve it uses this ruby trick:

env = {var1: 'some value 1', var2: 'some value 2'}

template = "We have var1: %{var1} and var2: %{var2}."

result = template % env

puts result # We have var1: some value 1 and var2: some value 2.

Usage

It's straightforward:

# some_template.txt

We have var1: #{var1} and var2:  #{var2}.

# test.rb

require 'text_interpolator'

env ={var1: 'some value 1', var2: 'some value 2'}

template = File.read("some_template.txt")

text_interpolator = TextInterpolator.new

result = text_interpolator.interpolate template, env

puts result # We have var1: some value 1 and var2: some value 2.