Right-align values in table

Author: jhawthorn

lib/results_table_builder.rb

@@ -129,7 +129,8 @@ def build_ratio_columns(row, base_t0, other_t0s, base_t, other_ts)
   def format_ratio(ratio, pval)
     sym = significance_symbol(pval)
     formatted = "%.3f" % ratio
-    sym.empty? ? formatted : "#{formatted} (#{sym})"
+    suffix = sym.empty? ? "" : " (#{sym})"
+    (formatted + suffix).ljust(formatted.length + 6)
   end
 
   def format_p_value(pval)

lib/table_formatter.rb

@@ -70,8 +70,9 @@ def build_separator(col_widths)
   end
 
   def format_row(row, col_widths)
-    row.map.with_index { |cell, i| cell.ljust(col_widths[i]) }
-       .join(COLUMN_SEPARATOR)
-       .rstrip
+    row.map.with_index { |cell, i|
+      i == 0 ? cell.ljust(col_widths[i]) : cell.rjust(col_widths[i])
+    }.join(COLUMN_SEPARATOR)
+      .rstrip
   end
 end

test/table_formatter_test.rb

@@ -17,8 +17,8 @@
       assert_equal <<~TABLE, result
         -----  ---------  ----------
         bench  time (ms)  stddev (%)
-        fib    100.5      2.3
-        loop   50.2       1.1
+        fib        100.5         2.3
+        loop        50.2         1.1
         -----  ---------  ----------
       TABLE
     end
@@ -36,8 +36,8 @@
       assert_equal <<~TABLE, result
         ------------  ---------
         bench         time (ms)
-        broken_bench  N/A
-        fib           100.5
+        broken_bench        N/A
+        fib               100.5
         ------------  ---------
       TABLE
     end