feat: add Obsidian Tasks markdown export format (GH#819)

Merge PR #819 from justbry with improvements:
- Add --format obsidian option to bd export
- Generate Obsidian Tasks-compatible markdown
- Default output to ai_docs/changes-log.md
- Map status to checkboxes, priority to emoji, type to tags
- Support parent-child hierarchy with indentation
- Use official Obsidian Tasks format (🆔, ⛔ emojis)

Improvement over PR: replaced O(n²) bubble sort with slices.SortFunc
for date ordering.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: justbry <justbu42@proton.me>
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/export.go

@@ -114,14 +114,21 @@ func validateExportPath(path string) error {
 var exportCmd = &cobra.Command{
 	Use:     "export",
 	GroupID: "sync",
-	Short:   "Export issues to JSONL format",
-	Long: `Export all issues to JSON Lines format (one JSON object per line).
+	Short:   "Export issues to JSONL or Obsidian format",
+	Long: `Export all issues to JSON Lines or Obsidian Tasks markdown format.
 Issues are sorted by ID for consistent diffs.
 
 Output to stdout by default, or use -o flag for file output.
+For obsidian format, defaults to ai_docs/changes-log.md
+
+Formats:
+  jsonl     - JSON Lines format (one JSON object per line) [default]
+  obsidian  - Obsidian Tasks markdown format with checkboxes, priorities, dates
 
 Examples:
   bd export --status open -o open-issues.jsonl
+  bd export --format obsidian                    # outputs to ai_docs/changes-log.md
+  bd export --format obsidian -o custom.md       # outputs to custom.md
   bd export --type bug --priority-max 1
   bd export --created-after 2025-01-01 --assignee alice`,
 	Run: func(cmd *cobra.Command, args []string) {
@@ -144,11 +151,16 @@ Examples:
 
 		debug.Logf("Debug: export flags - output=%q, force=%v\n", output, force)
 
-		if format != "jsonl" {
-			fmt.Fprintf(os.Stderr, "Error: only 'jsonl' format is currently supported\n")
+		if format != "jsonl" && format != "obsidian" {
+			fmt.Fprintf(os.Stderr, "Error: format must be 'jsonl' or 'obsidian'\n")
 			os.Exit(1)
 		}
 
+		// Default output path for obsidian format
+		if format == "obsidian" && output == "" {
+			output = "ai_docs/changes-log.md"
+		}
+
 		// Export command requires direct database access for consistent snapshot
 		// If daemon is connected, close it and open direct connection
 		if daemonClient != nil {
@@ -408,6 +420,13 @@ Examples:
 			// Create temporary file in same directory for atomic rename
 			dir := filepath.Dir(output)
 			base := filepath.Base(output)
+
+			// Ensure output directory exists
+			if err := os.MkdirAll(dir, 0755); err != nil {
+				fmt.Fprintf(os.Stderr, "Error creating output directory: %v\n", err)
+				os.Exit(1)
+			}
+
 			var err error
 			tempFile, err = os.CreateTemp(dir, base+".tmp.*")
 			if err != nil {
@@ -428,17 +447,29 @@ Examples:
 			out = tempFile
 		}
 
-		// Write JSONL (timestamp-only deduplication DISABLED due to bd-160)
-		encoder := json.NewEncoder(out)
+		// Write output based on format
 		exportedIDs := make([]string, 0, len(issues))
 		skippedCount := 0
-		for _, issue := range issues {
-			if err := encoder.Encode(issue); err != nil {
-				fmt.Fprintf(os.Stderr, "Error encoding issue %s: %v\n", issue.ID, err)
+
+		if format == "obsidian" {
+			// Write Obsidian Tasks markdown format
+			if err := writeObsidianExport(out, issues); err != nil {
+				fmt.Fprintf(os.Stderr, "Error writing Obsidian export: %v\n", err)
 				os.Exit(1)
 			}
-
-			exportedIDs = append(exportedIDs, issue.ID)
+			for _, issue := range issues {
+				exportedIDs = append(exportedIDs, issue.ID)
+			}
+		} else {
+			// Write JSONL (timestamp-only deduplication DISABLED due to bd-160)
+			encoder := json.NewEncoder(out)
+			for _, issue := range issues {
+				if err := encoder.Encode(issue); err != nil {
+					fmt.Fprintf(os.Stderr, "Error encoding issue %s: %v\n", issue.ID, err)
+					os.Exit(1)
+				}
+				exportedIDs = append(exportedIDs, issue.ID)
+			}
 		}
 
 		// Report skipped issues if any (helps debugging bd-159)
@@ -495,18 +526,20 @@ Examples:
 				}
 			}
 
-			// Verify JSONL file integrity after export
-			actualCount, err := countIssuesInJSONL(finalPath)
-			if err != nil {
-				fmt.Fprintf(os.Stderr, "Error: Export verification failed: %v\n", err)
-				os.Exit(1)
-			}
-			if actualCount != len(exportedIDs) {
-				fmt.Fprintf(os.Stderr, "Error: Export verification failed\n")
-				fmt.Fprintf(os.Stderr, "  Expected: %d issues\n", len(exportedIDs))
-				fmt.Fprintf(os.Stderr, "  JSONL file: %d lines\n", actualCount)
-				fmt.Fprintf(os.Stderr, "  Mismatch indicates export failed to write all issues\n")
-				os.Exit(1)
+			// Verify JSONL file integrity after export (skip for other formats)
+			if format == "jsonl" {
+				actualCount, err := countIssuesInJSONL(finalPath)
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "Error: Export verification failed: %v\n", err)
+					os.Exit(1)
+				}
+				if actualCount != len(exportedIDs) {
+					fmt.Fprintf(os.Stderr, "Error: Export verification failed\n")
+					fmt.Fprintf(os.Stderr, "  Expected: %d issues\n", len(exportedIDs))
+					fmt.Fprintf(os.Stderr, "  JSONL file: %d lines\n", actualCount)
+					fmt.Fprintf(os.Stderr, "  Mismatch indicates export failed to write all issues\n")
+					os.Exit(1)
+				}
 			}
 
 			// Update database mtime to be >= JSONL mtime (fixes #278, #301, #321)
@@ -540,7 +573,7 @@ Examples:
 }
 
 func init() {
-	exportCmd.Flags().StringP("format", "f", "jsonl", "Export format (jsonl)")
+	exportCmd.Flags().StringP("format", "f", "jsonl", "Export format: jsonl, obsidian")
 	exportCmd.Flags().StringP("output", "o", "", "Output file (default: stdout)")
 	exportCmd.Flags().StringP("status", "s", "", "Filter by status")
 	exportCmd.Flags().Bool("force", false, "Force export even if database is empty")

cmd/bd/export_obsidian.go

@@ -0,0 +1,206 @@
+package main
+
+import (
+	"cmp"
+	"fmt"
+	"io"
+	"slices"
+	"strings"
+	"time"
+
+	"github.com/steveyegge/beads/internal/types"
+)
+
+// obsidianCheckbox maps bd status to Obsidian Tasks checkbox syntax
+var obsidianCheckbox = map[types.Status]string{
+	types.StatusOpen:       "- [ ]",
+	types.StatusInProgress: "- [/]",
+	types.StatusBlocked:    "- [c]",
+	types.StatusClosed:     "- [x]",
+	types.StatusTombstone:  "- [-]",
+	types.StatusDeferred:   "- [-]",
+	types.StatusPinned:     "- [n]", // Review/attention
+	types.StatusHooked:     "- [/]", // Treat as in-progress
+}
+
+// obsidianPriority maps bd priority (0-4) to Obsidian priority emoji
+var obsidianPriority = []string{
+	"🔺", // 0 = critical/highest
+	"⏫", // 1 = high
+	"🔼", // 2 = medium
+	"🔽", // 3 = low
+	"⏬", // 4 = backlog/lowest
+}
+
+// obsidianTypeTag maps bd issue type to Obsidian tag
+var obsidianTypeTag = map[types.IssueType]string{
+	types.TypeBug:          "#Bug",
+	types.TypeFeature:      "#Feature",
+	types.TypeTask:         "#Task",
+	types.TypeEpic:         "#Epic",
+	types.TypeChore:        "#Chore",
+	types.TypeMessage:      "#Message",
+	types.TypeMergeRequest: "#MergeRequest",
+	types.TypeMolecule:     "#Molecule",
+	types.TypeGate:         "#Gate",
+	types.TypeAgent:        "#Agent",
+	types.TypeRole:         "#Role",
+	types.TypeConvoy:       "#Convoy",
+	types.TypeEvent:        "#Event",
+}
+
+// formatObsidianTask converts a single issue to Obsidian Tasks format
+func formatObsidianTask(issue *types.Issue) string {
+	var parts []string
+
+	// Checkbox based on status
+	checkbox, ok := obsidianCheckbox[issue.Status]
+	if !ok {
+		checkbox = "- [ ]" // default to open
+	}
+	parts = append(parts, checkbox)
+
+	// Title first
+	parts = append(parts, issue.Title)
+
+	// Task ID with 🆔 emoji (official Obsidian Tasks format)
+	parts = append(parts, fmt.Sprintf("🆔 %s", issue.ID))
+
+	// Priority emoji
+	if issue.Priority >= 0 && issue.Priority < len(obsidianPriority) {
+		parts = append(parts, obsidianPriority[issue.Priority])
+	}
+
+	// Type tag
+	if tag, ok := obsidianTypeTag[issue.IssueType]; ok {
+		parts = append(parts, tag)
+	}
+
+	// Labels as tags
+	for _, label := range issue.Labels {
+		// Sanitize label for tag use (replace spaces with dashes)
+		tag := "#" + strings.ReplaceAll(label, " ", "-")
+		parts = append(parts, tag)
+	}
+
+	// Start date (created_at)
+	parts = append(parts, fmt.Sprintf("🛫 %s", issue.CreatedAt.Format("2006-01-02")))
+
+	// End date (closed_at) if closed
+	if issue.ClosedAt != nil {
+		parts = append(parts, fmt.Sprintf("✅ %s", issue.ClosedAt.Format("2006-01-02")))
+	}
+
+	// Dependencies with ⛔ emoji (official Obsidian Tasks "blocked by" format)
+	// Include both blocks and parent-child relationships
+	for _, dep := range issue.Dependencies {
+		if dep.Type == types.DepBlocks || dep.Type == types.DepParentChild {
+			parts = append(parts, fmt.Sprintf("⛔ %s", dep.DependsOnID))
+		}
+	}
+
+	return strings.Join(parts, " ")
+}
+
+// groupIssuesByDate groups issues by their most recent activity date
+func groupIssuesByDate(issues []*types.Issue) map[string][]*types.Issue {
+	grouped := make(map[string][]*types.Issue)
+	for _, issue := range issues {
+		// Use the most recent date: closed_at > updated_at > created_at
+		var date time.Time
+		if issue.ClosedAt != nil {
+			date = *issue.ClosedAt
+		} else {
+			date = issue.UpdatedAt
+		}
+		key := date.Format("2006-01-02")
+		grouped[key] = append(grouped[key], issue)
+	}
+	return grouped
+}
+
+// buildParentChildMap builds a map of parent ID -> child issues from parent-child dependencies
+func buildParentChildMap(issues []*types.Issue) (map[string][]*types.Issue, map[string]bool) {
+	parentToChildren := make(map[string][]*types.Issue)
+	isChild := make(map[string]bool)
+
+	// Build lookup map
+	issueByID := make(map[string]*types.Issue)
+	for _, issue := range issues {
+		issueByID[issue.ID] = issue
+	}
+
+	// Find parent-child relationships
+	for _, issue := range issues {
+		for _, dep := range issue.Dependencies {
+			if dep.Type == types.DepParentChild {
+				parentID := dep.DependsOnID
+				parentToChildren[parentID] = append(parentToChildren[parentID], issue)
+				isChild[issue.ID] = true
+			}
+		}
+	}
+
+	return parentToChildren, isChild
+}
+
+// writeObsidianExport writes issues in Obsidian Tasks markdown format
+func writeObsidianExport(w io.Writer, issues []*types.Issue) error {
+	// Write header
+	if _, err := fmt.Fprintln(w, "# Changes Log"); err != nil {
+		return err
+	}
+	if _, err := fmt.Fprintln(w); err != nil {
+		return err
+	}
+
+	// Build parent-child hierarchy
+	parentToChildren, isChild := buildParentChildMap(issues)
+
+	// Group by date
+	grouped := groupIssuesByDate(issues)
+
+	// Get sorted dates (most recent first)
+	dates := make([]string, 0, len(grouped))
+	for date := range grouped {
+		dates = append(dates, date)
+	}
+	// Sort descending (reverse order)
+	slices.SortFunc(dates, func(a, b string) int {
+		return cmp.Compare(b, a) // reverse: b before a for descending
+	})
+
+	// Write each date section
+	for _, date := range dates {
+		if _, err := fmt.Fprintf(w, "## %s\n\n", date); err != nil {
+			return err
+		}
+		for _, issue := range grouped[date] {
+			// Skip children - they'll be written under their parent
+			if isChild[issue.ID] {
+				continue
+			}
+
+			// Write parent issue
+			line := formatObsidianTask(issue)
+			if _, err := fmt.Fprintln(w, line); err != nil {
+				return err
+			}
+
+			// Write children indented
+			if children, ok := parentToChildren[issue.ID]; ok {
+				for _, child := range children {
+					childLine := "  " + formatObsidianTask(child)
+					if _, err := fmt.Fprintln(w, childLine); err != nil {
+						return err
+					}
+				}
+			}
+		}
+		if _, err := fmt.Fprintln(w); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

cmd/bd/export_obsidian_test.go

@@ -0,0 +1,428 @@
+package main
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/steveyegge/beads/internal/types"
+)
+
+func TestFormatObsidianTask_StatusMapping(t *testing.T) {
+	tests := []struct {
+		name     string
+		status   types.Status
+		expected string
+	}{
+		{"open", types.StatusOpen, "- [ ]"},
+		{"in_progress", types.StatusInProgress, "- [/]"},
+		{"blocked", types.StatusBlocked, "- [c]"},
+		{"closed", types.StatusClosed, "- [x]"},
+		{"tombstone", types.StatusTombstone, "- [-]"},
+		{"deferred", types.StatusDeferred, "- [-]"},
+		{"pinned", types.StatusPinned, "- [n]"},
+		{"hooked", types.StatusHooked, "- [/]"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			issue := &types.Issue{
+				ID:        "test-1",
+				Title:     "Test Issue",
+				Status:    tt.status,
+				Priority:  2,
+				CreatedAt: time.Now(),
+			}
+			result := formatObsidianTask(issue)
+			if !strings.HasPrefix(result, tt.expected) {
+				t.Errorf("expected prefix %q, got %q", tt.expected, result)
+			}
+		})
+	}
+}
+
+func TestFormatObsidianTask_PriorityMapping(t *testing.T) {
+	tests := []struct {
+		priority int
+		emoji    string
+	}{
+		{0, "🔺"},
+		{1, "⏫"},
+		{2, "🔼"},
+		{3, "🔽"},
+		{4, "⏬"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.emoji, func(t *testing.T) {
+			issue := &types.Issue{
+				ID:        "test-1",
+				Title:     "Test Issue",
+				Status:    types.StatusOpen,
+				Priority:  tt.priority,
+				CreatedAt: time.Now(),
+			}
+			result := formatObsidianTask(issue)
+			if !strings.Contains(result, tt.emoji) {
+				t.Errorf("expected emoji %q in result %q", tt.emoji, result)
+			}
+		})
+	}
+}
+
+func TestFormatObsidianTask_TypeTags(t *testing.T) {
+	tests := []struct {
+		issueType types.IssueType
+		tag       string
+	}{
+		{types.TypeBug, "#Bug"},
+		{types.TypeFeature, "#Feature"},
+		{types.TypeTask, "#Task"},
+		{types.TypeEpic, "#Epic"},
+		{types.TypeChore, "#Chore"},
+	}
+
+	for _, tt := range tests {
+		t.Run(string(tt.issueType), func(t *testing.T) {
+			issue := &types.Issue{
+				ID:        "test-1",
+				Title:     "Test Issue",
+				Status:    types.StatusOpen,
+				Priority:  2,
+				IssueType: tt.issueType,
+				CreatedAt: time.Now(),
+			}
+			result := formatObsidianTask(issue)
+			if !strings.Contains(result, tt.tag) {
+				t.Errorf("expected tag %q in result %q", tt.tag, result)
+			}
+		})
+	}
+}
+
+func TestFormatObsidianTask_Labels(t *testing.T) {
+	issue := &types.Issue{
+		ID:        "test-1",
+		Title:     "Test Issue",
+		Status:    types.StatusOpen,
+		Priority:  2,
+		Labels:    []string{"urgent", "needs review"},
+		CreatedAt: time.Now(),
+	}
+	result := formatObsidianTask(issue)
+
+	if !strings.Contains(result, "#urgent") {
+		t.Errorf("expected #urgent in result %q", result)
+	}
+	if !strings.Contains(result, "#needs-review") {
+		t.Errorf("expected #needs-review (spaces replaced with dashes) in result %q", result)
+	}
+}
+
+func TestFormatObsidianTask_Dates(t *testing.T) {
+	created := time.Date(2025, 1, 15, 10, 0, 0, 0, time.UTC)
+	closed := time.Date(2025, 1, 20, 15, 0, 0, 0, time.UTC)
+
+	issue := &types.Issue{
+		ID:        "test-1",
+		Title:     "Test Issue",
+		Status:    types.StatusClosed,
+		Priority:  2,
+		CreatedAt: created,
+		ClosedAt:  &closed,
+	}
+	result := formatObsidianTask(issue)
+
+	if !strings.Contains(result, "🛫 2025-01-15") {
+		t.Errorf("expected start date 🛫 2025-01-15 in result %q", result)
+	}
+	if !strings.Contains(result, "✅ 2025-01-20") {
+		t.Errorf("expected end date ✅ 2025-01-20 in result %q", result)
+	}
+}
+
+func TestFormatObsidianTask_TaskID(t *testing.T) {
+	issue := &types.Issue{
+		ID:        "bd-123",
+		Title:     "Test Issue",
+		Status:    types.StatusOpen,
+		Priority:  2,
+		CreatedAt: time.Now(),
+	}
+	result := formatObsidianTask(issue)
+
+	// Check for official Obsidian Tasks ID format: 🆔 id
+	if !strings.Contains(result, "🆔 bd-123") {
+		t.Errorf("expected '🆔 bd-123' in result %q", result)
+	}
+}
+
+func TestFormatObsidianTask_Dependencies(t *testing.T) {
+	issue := &types.Issue{
+		ID:        "test-1",
+		Title:     "Test Issue",
+		Status:    types.StatusBlocked,
+		Priority:  2,
+		CreatedAt: time.Now(),
+		Dependencies: []*types.Dependency{
+			{IssueID: "test-1", DependsOnID: "test-2", Type: types.DepBlocks},
+		},
+	}
+	result := formatObsidianTask(issue)
+
+	// Check for official Obsidian Tasks "blocked by" format: ⛔ id
+	if !strings.Contains(result, "⛔ test-2") {
+		t.Errorf("expected '⛔ test-2' in result %q", result)
+	}
+}
+
+func TestGroupIssuesByDate(t *testing.T) {
+	date1 := time.Date(2025, 1, 15, 10, 0, 0, 0, time.UTC)
+	date2 := time.Date(2025, 1, 16, 10, 0, 0, 0, time.UTC)
+
+	issues := []*types.Issue{
+		{ID: "test-1", UpdatedAt: date1},
+		{ID: "test-2", UpdatedAt: date1},
+		{ID: "test-3", UpdatedAt: date2},
+	}
+
+	grouped := groupIssuesByDate(issues)
+
+	if len(grouped) != 2 {
+		t.Errorf("expected 2 date groups, got %d", len(grouped))
+	}
+	if len(grouped["2025-01-15"]) != 2 {
+		t.Errorf("expected 2 issues for 2025-01-15, got %d", len(grouped["2025-01-15"]))
+	}
+	if len(grouped["2025-01-16"]) != 1 {
+		t.Errorf("expected 1 issue for 2025-01-16, got %d", len(grouped["2025-01-16"]))
+	}
+}
+
+func TestGroupIssuesByDate_UsesClosedAt(t *testing.T) {
+	updated := time.Date(2025, 1, 15, 10, 0, 0, 0, time.UTC)
+	closed := time.Date(2025, 1, 20, 10, 0, 0, 0, time.UTC)
+
+	issues := []*types.Issue{
+		{ID: "test-1", UpdatedAt: updated, ClosedAt: &closed},
+	}
+
+	grouped := groupIssuesByDate(issues)
+
+	if _, ok := grouped["2025-01-20"]; !ok {
+		t.Error("expected issue to be grouped by closed_at date (2025-01-20)")
+	}
+	if _, ok := grouped["2025-01-15"]; ok {
+		t.Error("issue should not be grouped by updated_at when closed_at exists")
+	}
+}
+
+func TestWriteObsidianExport(t *testing.T) {
+	date1 := time.Date(2025, 1, 15, 10, 0, 0, 0, time.UTC)
+	date2 := time.Date(2025, 1, 16, 10, 0, 0, 0, time.UTC)
+
+	issues := []*types.Issue{
+		{
+			ID:        "test-1",
+			Title:     "First Issue",
+			Status:    types.StatusOpen,
+			Priority:  2,
+			IssueType: types.TypeTask,
+			CreatedAt: date1,
+			UpdatedAt: date1,
+		},
+		{
+			ID:        "test-2",
+			Title:     "Second Issue",
+			Status:    types.StatusClosed,
+			Priority:  1,
+			IssueType: types.TypeBug,
+			CreatedAt: date2,
+			UpdatedAt: date2,
+		},
+	}
+
+	var buf bytes.Buffer
+	err := writeObsidianExport(&buf, issues)
+	if err != nil {
+		t.Fatalf("writeObsidianExport failed: %v", err)
+	}
+
+	output := buf.String()
+
+	// Check header
+	if !strings.HasPrefix(output, "# Changes Log\n") {
+		t.Error("expected output to start with '# Changes Log'")
+	}
+
+	// Check date sections exist (most recent first)
+	idx1 := strings.Index(output, "## 2025-01-16")
+	idx2 := strings.Index(output, "## 2025-01-15")
+	if idx1 == -1 || idx2 == -1 {
+		t.Error("expected both date headers to exist")
+	}
+	if idx1 > idx2 {
+		t.Error("expected 2025-01-16 (more recent) to appear before 2025-01-15")
+	}
+
+	// Check issues are present
+	if !strings.Contains(output, "test-1") {
+		t.Error("expected test-1 in output")
+	}
+	if !strings.Contains(output, "test-2") {
+		t.Error("expected test-2 in output")
+	}
+}
+
+func TestWriteObsidianExport_Empty(t *testing.T) {
+	var buf bytes.Buffer
+	err := writeObsidianExport(&buf, []*types.Issue{})
+	if err != nil {
+		t.Fatalf("writeObsidianExport failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.HasPrefix(output, "# Changes Log\n") {
+		t.Error("expected output to start with '# Changes Log' even when empty")
+	}
+}
+
+func TestFormatObsidianTask_ParentChildDependency(t *testing.T) {
+	issue := &types.Issue{
+		ID:        "test-1.1",
+		Title:     "Child Task",
+		Status:    types.StatusOpen,
+		Priority:  2,
+		CreatedAt: time.Now(),
+		Dependencies: []*types.Dependency{
+			{IssueID: "test-1.1", DependsOnID: "test-1", Type: types.DepParentChild},
+		},
+	}
+	result := formatObsidianTask(issue)
+
+	// Parent-child deps should also show as ⛔ (blocked by parent)
+	if !strings.Contains(result, "⛔ test-1") {
+		t.Errorf("expected '⛔ test-1' for parent-child dep in result %q", result)
+	}
+}
+
+func TestBuildParentChildMap(t *testing.T) {
+	date := time.Date(2025, 1, 15, 10, 0, 0, 0, time.UTC)
+
+	issues := []*types.Issue{
+		{
+			ID:        "parent-1",
+			Title:     "Parent Epic",
+			IssueType: types.TypeEpic,
+			CreatedAt: date,
+			UpdatedAt: date,
+		},
+		{
+			ID:        "parent-1.1",
+			Title:     "Child Task 1",
+			IssueType: types.TypeTask,
+			CreatedAt: date,
+			UpdatedAt: date,
+			Dependencies: []*types.Dependency{
+				{IssueID: "parent-1.1", DependsOnID: "parent-1", Type: types.DepParentChild},
+			},
+		},
+		{
+			ID:        "parent-1.2",
+			Title:     "Child Task 2",
+			IssueType: types.TypeTask,
+			CreatedAt: date,
+			UpdatedAt: date,
+			Dependencies: []*types.Dependency{
+				{IssueID: "parent-1.2", DependsOnID: "parent-1", Type: types.DepParentChild},
+			},
+		},
+	}
+
+	parentToChildren, isChild := buildParentChildMap(issues)
+
+	// Check parent has 2 children
+	if len(parentToChildren["parent-1"]) != 2 {
+		t.Errorf("expected 2 children for parent-1, got %d", len(parentToChildren["parent-1"]))
+	}
+
+	// Check children are marked
+	if !isChild["parent-1.1"] {
+		t.Error("expected parent-1.1 to be marked as child")
+	}
+	if !isChild["parent-1.2"] {
+		t.Error("expected parent-1.2 to be marked as child")
+	}
+
+	// Parent should not be marked as child
+	if isChild["parent-1"] {
+		t.Error("parent-1 should not be marked as child")
+	}
+}
+
+func TestWriteObsidianExport_ParentChildHierarchy(t *testing.T) {
+	date := time.Date(2025, 1, 15, 10, 0, 0, 0, time.UTC)
+
+	issues := []*types.Issue{
+		{
+			ID:        "epic-1",
+			Title:     "Auth System",
+			Status:    types.StatusOpen,
+			Priority:  1,
+			IssueType: types.TypeEpic,
+			CreatedAt: date,
+			UpdatedAt: date,
+		},
+		{
+			ID:        "epic-1.1",
+			Title:     "Login Page",
+			Status:    types.StatusOpen,
+			Priority:  2,
+			IssueType: types.TypeTask,
+			CreatedAt: date,
+			UpdatedAt: date,
+			Dependencies: []*types.Dependency{
+				{IssueID: "epic-1.1", DependsOnID: "epic-1", Type: types.DepParentChild},
+			},
+		},
+		{
+			ID:        "epic-1.2",
+			Title:     "Logout Button",
+			Status:    types.StatusOpen,
+			Priority:  2,
+			IssueType: types.TypeTask,
+			CreatedAt: date,
+			UpdatedAt: date,
+			Dependencies: []*types.Dependency{
+				{IssueID: "epic-1.2", DependsOnID: "epic-1", Type: types.DepParentChild},
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	err := writeObsidianExport(&buf, issues)
+	if err != nil {
+		t.Fatalf("writeObsidianExport failed: %v", err)
+	}
+
+	output := buf.String()
+
+	// Check parent is present (not indented)
+	if !strings.Contains(output, "- [ ] Auth System") {
+		t.Error("expected parent 'Auth System' in output")
+	}
+
+	// Check children are indented (2 spaces)
+	if !strings.Contains(output, "  - [ ] Login Page") {
+		t.Errorf("expected indented child 'Login Page' in output:\n%s", output)
+	}
+	if !strings.Contains(output, "  - [ ] Logout Button") {
+		t.Errorf("expected indented child 'Logout Button' in output:\n%s", output)
+	}
+
+	// Children should have ⛔ dependency on parent
+	if !strings.Contains(output, "⛔ epic-1") {
+		t.Errorf("expected children to have '⛔ epic-1' dependency in output:\n%s", output)
+	}
+}