fix: rewrite bench output parser to correctly split benchmark name from timing line

Author: ElioNeto

.github/workflows/benchmarks.yml

@@ -83,36 +83,50 @@ jobs:
             exit 0
           fi
 
-          # Parse Criterion output: lines like "time: [X.XX µs X.XX µs X.XX µs]"
-          ROWS=""
-          CURRENT_BENCH=""
-          while IFS= read -r line; do
-            # Detect benchmark name (lines that don't start with whitespace and aren't empty)
-            if echo "$line" | grep -qE '^[a-zA-Z].*/{0,1}[a-zA-Z]'; then
-              CURRENT_BENCH=$(echo "$line" | sed 's|/| / |g' | xargs)
-            fi
-            # Detect timing line
-            if echo "$line" | grep -qE 'time:.*\['; then
-              # Extract the middle (median) value
-              MEDIAN=$(echo "$line" | grep -oE '\[[^]]+\]' | head -1 | sed 's/\[//' | sed 's/\]//' | awk '{print $3, $4}')
-              if [ -n "$CURRENT_BENCH" ] && [ -n "$MEDIAN" ]; then
-                ROWS="$ROWS\n| \`$CURRENT_BENCH\` | $MEDIAN |"
-              fi
-            fi
-          done < bench_output.txt
+          # Parse using Perl: handles multi-line Criterion output correctly.
+          # Criterion format:
+          #   Line 1 (name line):   "bench_name/param        time:   [low median high]"
+          #   OR split across two lines:
+          #   Line 1: "bench_name/param"
+          #   Line 2: "                        time:   [low median high]"
+          # Strategy: collect name from lines that look like bench names (no leading space,
+          # contain word chars + optional /param), then extract median from the time: [...] line.
+          ROWS=$(perl -ne '
+            # Match standalone benchmark name line (no leading whitespace, ends with word/number)
+            if (/^([a-zA-Z]\S+(?:\/\S+)?)\s*$/) {
+              $name = $1;
+            }
+            # Match inline: "bench_name/param   time:   [low median high]"
+            elsif (/^([a-zA-Z]\S+(?:\/\S+)?)\s+time:\s+\[([^\]]+)\]/) {
+              $name = $1;
+              my @vals = split(/\s+/, $2);
+              # median is index 2 (0=low_val, 1=low_unit, 2=med_val, 3=med_unit)
+              my $median = "$vals[2] $vals[3]";
+              $median =~ s/^\s+|\s+$//g;
+              print "| `$name` | $median |\n";
+              $name = "";
+            }
+            # Match timing on its own line (after name was set)
+            elsif ($name && /^\s+time:\s+\[([^\]]+)\]/) {
+              my @vals = split(/\s+/, $1);
+              my $median = "$vals[2] $vals[3]";
+              $median =~ s/^\s+|\s+$//g;
+              print "| `$name` | $median |\n";
+              $name = "";
+            }
+          ' bench_output.txt)
 
           # Build the full block
           {
             echo "<!-- BENCHMARK_RESULTS_START -->"
             echo "> 🤖 Auto-updated by CI on **${DATE}** — [View run](${RUN_URL})"
             echo ""
             if [ -n "$ROWS" ]; then
-              echo "| Benchmark | Tempo (mediana) |"
-              echo "|-----------|----------------|"
-              printf "%b" "$ROWS"
-              echo ""
+              echo "| Benchmark | Mediana |"
+              echo "|-----------|--------|"
+              echo "$ROWS"
             else
-              echo "*Nenhum resultado parseados — verifique os [artefatos do run](${RUN_URL}).*"
+              echo "*Nenhum resultado parseado — verifique os [artefatos do run](${RUN_URL}).*"
             fi
             echo ""
             echo "<!-- BENCHMARK_RESULTS_END -->"