Write reports to operator-selected outputs

internal/report/daily_report.go

@@ -17,7 +17,7 @@ func dailyDefinition() Definition {
 		GeneratedTextSchemaID: "daily",
 		ComparisonStrategy:    CompareSameValidDate,
 		ArtifactGroup:         "daily",
-		BatchOutputName:       "daily.md",
+		OutputName:            "daily.md",
 		DistributorPathTemplates: []string{
 			"daily/{valid_start_date}/{run_id}.md",
 			"daily/{valid_start_date}/index.md",

internal/report/definition.go

@@ -42,7 +42,7 @@ type Definition struct {
 	GeneratedTextSchemaID    string
 	ComparisonStrategy       ComparisonStrategy
 	ArtifactGroup            string
-	BatchOutputName          string
+	OutputName               string
 	DistributorPathTemplates []string
 	CompatiblePriorIDs       []ID
 	Modules                  []module.ConfigItem
@@ -52,6 +52,23 @@ type Definition struct {
 	runIDDisambiguator       func(Resolved) string
 }
 
+func (r Resolved) OutputName() (string, error) {
+	if r.Definition.ID == Daily {
+		if r.ValidPeriod.Start.IsZero() {
+			return "", fmt.Errorf("daily report has no valid-period start for output naming")
+		}
+		location, err := timeutil.LoadLocation(r.Timezone)
+		if err != nil {
+			return "", fmt.Errorf("load report timezone for output naming: %w", err)
+		}
+		return "daily-" + r.ValidPeriod.Start.In(location).Format(timeutil.DateLayout) + ".md", nil
+	}
+	if r.Definition.OutputName == "" {
+		return "", fmt.Errorf("report %q has no output name", r.Definition.ID)
+	}
+	return r.Definition.OutputName, nil
+}
+
 func (d Definition) ResolvePeriod(req ResolveRequest) (timeutil.Period, error) {
 	if d.resolve == nil {
 		return timeutil.Period{}, fmt.Errorf("report %q has no valid-period resolver", d.ID)

internal/report/hourly_report.go

@@ -19,7 +19,7 @@ func hourlyDefinition() Definition {
 		GeneratedTextSchemaID: "hourly",
 		ComparisonStrategy:    CompareRollingWindow,
 		ArtifactGroup:         "hourly",
-		BatchOutputName:       "hourly.md",
+		OutputName:            "hourly.md",
 		DistributorPathTemplates: []string{
 			"hourly/index.md",
 		},

internal/report/period_test.go

@@ -103,7 +103,7 @@ func TestRegistryDefinitionsPreserveRetainedContracts(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(string(tt.id), func(t *testing.T) {
 			definition := registry.MustLookup(tt.id)
-			if definition.ComparisonStrategy != tt.comparison || definition.Morning != tt.morning || definition.Evening != tt.evening || definition.BatchOutputName != tt.outputName {
+			if definition.ComparisonStrategy != tt.comparison || definition.Morning != tt.morning || definition.Evening != tt.evening || definition.OutputName != tt.outputName {
 				t.Fatalf("definition = %#v, want retained report contract", definition)
 			}
 			if strings.Join(definition.DistributorPathTemplates, "|") != strings.Join(tt.paths, "|") {

internal/report/today_report.go

@@ -15,7 +15,7 @@ func todayDefinition() Definition {
 		GeneratedTextSchemaID: "today",
 		ComparisonStrategy:    CompareSameValidDate,
 		ArtifactGroup:         "today",
-		BatchOutputName:       "today.md",
+		OutputName:            "today.md",
 		DistributorPathTemplates: []string{
 			"daily/{valid_start_date}/{run_id}.md",
 			"daily/{valid_start_date}/index.md",

internal/report/tomorrow_report.go

@@ -15,7 +15,7 @@ func tomorrowDefinition() Definition {
 		GeneratedTextSchemaID: "tomorrow",
 		ComparisonStrategy:    CompareSameValidDate,
 		ArtifactGroup:         "tomorrow",
-		BatchOutputName:       "tomorrow.md",
+		OutputName:            "tomorrow.md",
 		DistributorPathTemplates: []string{
 			"daily/{valid_start_date}/{run_id}.md",
 			"daily/{valid_start_date}/index.md",