explain reports captures and the chain a file would get

1 files changed, 18 insertions, 11 deletions

diff --git a/internal/engine/plan.go b/internal/engine/plan.go
index d9ffeb3..f2d6312 100644
--- a/internal/engine/plan.go
+++ b/internal/engine/plan.go
@@ -42,19 +42,26 @@ func (e *Engine) Plan(ctx context.Context, d *Dir, claims *plan.Claims) (*DirPla
 
 	inputs := make([]plan.Input, len(r.Matched))
 	for i, fm := range r.Matched {
-		rules := make([]plan.RuleMatch, len(fm.Rules))
-		for j, rm := range fm.Rules {
-			rules[j] = plan.RuleMatch{
-				Name:     rm.Rule.Name,
-				Actions:  rm.Rule.Conf.Actions,
-				Settings: rm.Rule.Settings,
-				Captures: rm.Captures,
-				Reasons:  rm.Reasons,
-			}
-		}
-		inputs[i] = plan.Input{File: fm.File, Rules: rules, NoDelete: fm.NoDelete}
+		inputs[i] = plan.Input{File: fm.File, Rules: planRules(fm.Rules), NoDelete: fm.NoDelete}
 	}
 
 	chains := plan.Build(d.Root, inputs, e.Now(), plan.OS{}, claims)
 	return &DirPlan{Dir: d, Chains: chains, Result: r, Elapsed: time.Since(started)}, nil
 }
+
+// planRules converts a file's matching rules into what plan.Build takes.
+// Explain builds the chain of one file the same way (GUI design §1.3), so
+// both go through this.
+func planRules(matched []RuleMatch) []plan.RuleMatch {
+	rules := make([]plan.RuleMatch, len(matched))
+	for i, rm := range matched {
+		rules[i] = plan.RuleMatch{
+			Name:     rm.Rule.Name,
+			Actions:  rm.Rule.Conf.Actions,
+			Settings: rm.Rule.Settings,
+			Captures: rm.Captures,
+			Reasons:  rm.Reasons,
+		}
+	}
+	return rules
+}