Format bar labels as integers when appropriate

lib/youplot/backends/unicode_plot.rb

@@ -67,6 +67,10 @@ def barplot(data, params, fmt = nil, count: false, reverse: false)
                      series[y_col].map(&:to_f)
                    end
         end
+        # If all values are integers, display without decimal points (#44)
+        if values.all? { |v| v.finite? && v == v.to_i }
+          values = values.map(&:to_i)
+        end
         ::UnicodePlot.barplot(labels, values, **params.to_hc)
       end
 

test/fixtures/integer-barplot.txt

@@ -0,0 +1,5 @@
+     ┌                                        ┐ 
+   a ┤■■■■■■■■■ 3                               
+   b ┤■■■■■■■■■■■■■■■■■■■■■ 7                   
+   c ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 12   
+     └                                        ┘ 

test/fixtures/integer.tsv

@@ -0,0 +1,3 @@
+a	3
+b	7
+c	12

test/youplot/integer_test.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require 'tempfile'
+require_relative '../test_helper'
+
+class YouPlotIntegerTest < Test::Unit::TestCase
+  class << self
+    def startup
+      @stdin  = $stdin.dup
+      @stdout = $stdout.dup
+      @stderr = $stderr.dup
+    end
+
+    def shutdown
+      $stdin  = @stdin
+      $stdout = @stdout
+      $stderr = @stderr
+    end
+  end
+
+  def setup
+    @stderr_file = Tempfile.new
+    @stdout_file = Tempfile.new
+    $stderr = @stderr_file
+    $stdout = @stdout_file
+  end
+
+  def teardown
+    @stderr_file.close
+    @stdout_file.close
+  end
+
+  def fixture(fname)
+    File.read(File.expand_path("../fixtures/#{fname}", __dir__))
+  end
+
+  # Issue #44: When all values are integers, display without decimal points
+  test :barplot_integer_values do
+    $stdin = File.open(File.expand_path('../fixtures/integer.tsv', __dir__), 'r')
+    YouPlot::Command.new(['bar']).run
+    assert_equal fixture('integer-barplot.txt'), @stderr_file.read
+  end
+end