diff --git a/lib/ledger.cr b/lib/ledger.cr
new file mode 100644
index 00000000..d14df908
--- /dev/null
+++ b/lib/ledger.cr
@@ -0,0 +1,164 @@
+# encoding: utf-8
+
+require "csv"
+require "http/server"
+
+# Ruby wrapper module for calling ledger
+module Ledger
+  @binary = "ledger"
+  @file = ENV[ "LEDGER_FILE" ]
+
+  def run( options, command = "", command_parameters = "" )
+    STDERR.puts "#{@binary} -f #{@file} #{options} #{command} #{command_parameters}"
+    `#{@binary} -f #{@file} #{options} #{command} #{command_parameters}`
+  end
+
+  def version
+    run "--version"
+  end
+
+  def accounts( depth = 9999 )
+    accounts = run( "", "accounts" )
+               .split( "\n" )
+               .map do |a|
+      a.split( ":" )
+      .each_slice( depth )
+      .to_a.first
+    end.uniq
+
+    accounts.map(&:length).max.times do |i|
+      accounts += accounts.map { |acc| acc.first( i ) }
+    end
+
+    accounts
+      .uniq
+      .sort
+      .reject { |a| a.empty? }
+      .sort_by { |a| a.length }
+  end
+
+  def dates_salaries( category = "salaire" )
+    CSV.parse( run( "", "csv", category ) )
+       .map do |row|
+      Date.parse row[ 0 ]
+    end
+       .uniq
+  end
+
+  def register( period = nil, categories = "" )
+    period = period.nil? ? "" : "-p '#{period}'"
+
+    CSV.parse( run( "--no-revalued --exchange '#{CURRENCY}' #{period}", "csv", categories ) )
+       .map do |row|
+      { date: row[ 0 ],
+        payee: row[ 2 ],
+        account: row[ 3 ],
+        amount: row[ 5 ],
+        currency: row[ 4 ] }
+    end
+  end
+
+  def balance( cleared = false, depth = nil, period = nil, categories = "" )
+    period = period.nil? ? "" : "-p '#{period}'"
+    depth = depth.nil? ? "" : "--depth #{depth}"
+    operation = cleared ? "cleared" : "balance"
+
+    run( "--flat --no-total --exchange '#{CURRENCY}' #{period} #{depth}", operation, categories )
+      .split( "\n" )
+      .map do |line|
+      line_array = line.split( "#{CURRENCY}" )
+
+      { account: line_array[ 1 ].strip,
+        amount: line_array[ 0 ].tr( SEPARATOR, "." ).to_f }
+    end
+  end
+
+  # def int_treefied_balance( node )
+  #   return { name: node[:account], size: node[:amount] } unless node[:account].include( ":" )
+
+  #   { name: node[:account].split(":").first,
+  #     children: int_treefied_balance( ... ) }
+  # end
+
+  # def treefeid_balance( cleared = false, depth = nil, period = nil, categories = "" )
+  #   bal = balance( cleared, depth, period, categories )
+
+
+  # end
+
+  def cleared
+    run( "--flat --no-total --exchange '#{CURRENCY}'", "cleared", "Assets Equity" )
+      .split( "\n" )
+      .map do |row|
+      fields = row.match( /\s*(\S+ €)\s*(\S+ €)\s*(\S+)\s*(\S+)/ )
+      { account: fields[ 4 ],
+        amount: { cleared: fields[ 2 ],
+                  all: fields[ 1 ] } } unless fields.nil?
+    end
+  end
+
+  def budget( period = nil, categories = "" )
+    period = period.nil? ? "" : "-p '#{period}'"
+
+    budgeted = run( "--flat --no-total --budget --exchange '#{CURRENCY}' #{period}", "budget", categories )
+               .lines
+               .map do |line|
+      ary = line.split
+
+      { currency: ary[1],
+        amount: ary[0].tr( SEPARATOR, "." ).to_f,
+        budget: ary[2].tr( SEPARATOR, "." ).to_f,
+        percentage: ary.last( 2 ).first.gsub( /%/, "" ).tr( SEPARATOR, "." ).to_f,
+        account: ary.last }
+    end
+
+    unbudgeted_amount = run( "--flat --no-total --unbudgeted -Mn --exchange '#{CURRENCY}' #{period}", "register", categories )
+                        .lines
+                        .map do |line|
+      line.split[4].tr( SEPARATOR, "." ).to_f
+    end
+                        .reduce( :+ )
+
+    budget = budgeted.map { |account| account[:budget] }.reduce( :+ )
+    income = run( "--flat --no-total --unbudgeted -Mn --exchange '#{CURRENCY}' #{period}", "register", "Income" )
+             .lines
+             .last
+             .split[4]
+             .tr( SEPARATOR, "." )
+             .to_f * -1
+    disposable_income = income - budget
+
+    budgeted << { currency: CURRENCY,
+                  amount: unbudgeted_amount,
+                  budget: disposable_income,
+                  percentage: (unbudgeted_amount / disposable_income) * 100,
+                  account: "(unbudgeted)" }
+  end
+
+  def graph_values( period = nil, categories = [ "Expenses" ] )
+    period = period.nil? ? "" : "-p '#{period}'"
+
+    result = {} of KeyType => ValueType
+    categories.each do |category|
+      result[ category ] = CSV
+                           .parse( run( "-MAn --exchange '#{CURRENCY}' #{period}", "csv --no-revalued", category ) )
+                           .map do |row|
+        { date: row[ 0 ],
+          amount: row[ 5 ],
+          currency: row[ 4 ] }
+      end
+    end
+
+    result
+  end
+end
+
+p Ledger#version
+
+server = HTTP::Server.new(8080) do |context|
+  context.response.content_type = "text/plain"
+  context.response.print Ledger#version # "Hello world, got #{context.request.path}!"
+end
+
+puts "Listening on http://127.0.0.1:8080"
+server.listen