Use simple formatter for pretty printing

Author: jeffreylovitz

Gemfile

@@ -3,7 +3,6 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'redis', '~> 4'
-gem 'terminal-table', '~> 1', '>= 1.8'
 gem 'rspec'
 gem 'codecov', :require => false, :group => :test
 

README.md

@@ -45,11 +45,11 @@ cmd = """MATCH ()-[:works]->(e:employer) RETURN e"""
 response = r.query(cmd)
 
 response.print_resultset
-+----------------+
-| e.name         |
-+----------------+
-| Dunder Mifflin |
-+----------------+
+--------------------------------
+| e                            |
+--------------------------------
+| [{"name"=>"Dunder Mifflin"}] |
+--------------------------------
 
 r.delete
  => "Graph removed, internal execution time: 0.416024 milliseconds"

lib/redisgraph.rb

@@ -1,5 +1,4 @@
 require 'redis'
-require 'terminal-table'
 
 require_relative 'redisgraph/errors.rb'
 require_relative 'redisgraph/query_result.rb'

lib/redisgraph/query_result.rb

@@ -39,10 +39,25 @@ def initialize(response, opts = {})
   def print_resultset
     return unless columns
 
-    pretty = Terminal::Table.new headings: columns do |t|
-      resultset.each { |record| t << record }
+    # Compute max length of each column
+    column_sizes = resultset.reduce([]) do |lengths, row|
+      row.each_with_index.map{|iterand, index| [lengths[index] || 0, iterand.to_s.length].max}
     end
-    puts pretty
+
+    # Print column headers
+    puts head = '-' * (column_sizes.inject(&:+) + (3 * column_sizes.count) + 1)
+    row = columns.fill(nil, columns.size..(column_sizes.size - 1))
+    row = row.each_with_index.map{|v, i| v = v.to_s + ' ' * (column_sizes[i] - v.to_s.length)}
+    puts '| ' + row.join(' | ') + ' |'
+    puts head
+
+    # Print result set rows
+    resultset.each do |row|
+      row = row.fill(nil, row.size..(column_sizes.size - 1))
+      row = row.each_with_index.map{|v, i| v = v.to_s + ' ' * (column_sizes[i] - v.to_s.length)}
+      puts '| ' + row.join(' | ') + ' |'
+    end
+    puts head
   end
 
   def parse_resultset(response)