feat(ui): add rain session logger and selector log panel

README.md

@@ -367,6 +367,8 @@ visual density (more or fewer seeds, longer or shorter blooms) for clarity.
 
 `git-rain --rain` opens an interactive picker. Repositories stream in as the filesystem scan finds them — no waiting for the full scan to complete before you can start picking. After you confirm, the tool runs the **default full fetch** (`git fetch --all`, prune opt-in) unless you passed **`--fetch-mainline`**, or **full branch hydration** is implied by **`--sync`**, **`--risky`**, **`risky_mode`** in config, a **non-mainline `branch_mode`**, or **any `--branch-mode`** on the CLI. Quitting (**`q`** or **`ctrl+c`**) cancels the in-progress scan (in-flight `git` subprocesses are aborted via the scan context); **`ctrl+c`** outside raw TTY mode is treated like cancel.
 
+Status strip and optional log panel are driven from structured session events. Confirming selection still exits TUI and runs fetch/sync work in normal CLI output.
+
 **Key bindings:**
 
 | Key | Action |
@@ -377,6 +379,8 @@ visual density (more or fewer seeds, longer or shorter blooms) for clarity.
 | `q` / `ctrl+c` | Abort picker |
 | `c` / `Esc` | Back from settings (ignored list uses `Esc` / `i` / `b`) |
 | `↑` / `↓` | Navigate |
+| `Shift+L` | Toggle in-TUI log panel |
+| `e` | Export visible TUI log buffer to `~/.cache/git-rain/exports/` |
 
 ## Safe Mode vs Risky Mode
 

cmd/root.go

@@ -23,6 +23,7 @@ import (
 	"github.com/git-rain/git-rain/internal/git"
 	"github.com/git-rain/git-rain/internal/registry"
 	"github.com/git-rain/git-rain/internal/safety"
+	"github.com/git-rain/git-rain/internal/sessionlog"
 	"github.com/git-rain/git-rain/internal/ui"
 )
 
@@ -508,6 +509,11 @@ func runRainTUIStream(cfg *config.Config, reg *registry.Registry, regPath string
 
 	userCfgDir, _ := config.UserGitRainDir()
 	cfgPath := filepath.Join(userCfgDir, "config.toml")
+	logger, err := sessionlog.NewLogger(sessionlog.DefaultLogDir())
+	if err != nil {
+		return fmt.Errorf("init rain logger: %w", err)
+	}
+	defer func() { _ = logger.Close() }()
 
 	selected, err := ui.RunRepoSelectorStream(
 		tuiRepoChan,
@@ -518,6 +524,7 @@ func runRainTUIStream(cfg *config.Config, reg *registry.Registry, regPath string
 		cfgPath,
 		reg,
 		regPath,
+		logger,
 	)
 
 	// Cancel scan first so filepath walk and in-flight git subprocesses unwind.

internal/sessionlog/logger.go

@@ -0,0 +1,127 @@
+package sessionlog
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/git-rain/git-rain/internal/safety"
+)
+
+// LogEntry matches git-fire's structured session event shape.
+type LogEntry struct {
+	Timestamp   time.Time `json:"timestamp"`
+	Level       string    `json:"level"`
+	Repo        string    `json:"repo,omitempty"`
+	Action      string    `json:"action"`
+	Description string    `json:"description"`
+	Error       string    `json:"error,omitempty"`
+	Duration    string    `json:"duration,omitempty"`
+}
+
+// EventSubscriber receives structured entries as they are written.
+type EventSubscriber func(LogEntry)
+
+// Logger writes JSONL session logs.
+type Logger struct {
+	logPath     string
+	file        *os.File
+	writes      int
+	subscribers []EventSubscriber
+}
+
+// NewLogger creates a new rain session logger.
+func NewLogger(logDir string) (*Logger, error) {
+	if err := os.MkdirAll(logDir, 0o700); err != nil {
+		return nil, fmt.Errorf("create log dir: %w", err)
+	}
+	logFilename := fmt.Sprintf("git-rain-%s.log", time.Now().Format("20060102-150405"))
+	logPath := filepath.Join(logDir, logFilename)
+	file, err := os.OpenFile(logPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o600)
+	if err != nil {
+		return nil, fmt.Errorf("create log file: %w", err)
+	}
+	logger := &Logger{logPath: logPath, file: file}
+	logger.Info("", "git-rain-start", "Git-rain session started")
+	return logger, nil
+}
+
+// Subscribe registers a process-local subscriber.
+func (l *Logger) Subscribe(fn EventSubscriber) {
+	if fn == nil {
+		return
+	}
+	l.subscribers = append(l.subscribers, fn)
+}
+
+// Log writes one JSONL entry.
+func (l *Logger) Log(entry LogEntry) error {
+	if l.file == nil {
+		return fmt.Errorf("logger not initialized")
+	}
+	entry.Timestamp = time.Now()
+	data, err := json.Marshal(entry)
+	if err != nil {
+		return fmt.Errorf("marshal log entry: %w", err)
+	}
+	if _, err := l.file.Write(append(data, '\n')); err != nil {
+		return fmt.Errorf("write log entry: %w", err)
+	}
+	for _, fn := range l.subscribers {
+		fn(entry)
+	}
+	l.writes++
+	if l.writes%20 == 0 {
+		return l.file.Sync()
+	}
+	return nil
+}
+
+// Info writes a level=info entry.
+func (l *Logger) Info(repo, action, description string) {
+	_ = l.Log(LogEntry{Level: "info", Repo: repo, Action: action, Description: description})
+}
+
+// Error writes a level=error entry with redaction.
+func (l *Logger) Error(repo, action, description string, err error) {
+	e := LogEntry{Level: "error", Repo: repo, Action: action, Description: description}
+	if err != nil {
+		e.Error = safety.SanitizeText(err.Error())
+	}
+	_ = l.Log(e)
+}
+
+// Success writes a level=success entry.
+func (l *Logger) Success(repo, action, description string, duration time.Duration) {
+	_ = l.Log(LogEntry{
+		Level:       "success",
+		Repo:        repo,
+		Action:      action,
+		Description: description,
+		Duration:    duration.String(),
+	})
+}
+
+// Close writes end marker and closes file.
+func (l *Logger) Close() error {
+	if l.file == nil {
+		return nil
+	}
+	l.Info("", "git-rain-end", "Git-rain session ended")
+	_ = l.file.Sync()
+	return l.file.Close()
+}
+
+// LogPath returns current file path.
+func (l *Logger) LogPath() string { return l.logPath }
+
+// DefaultLogDir resolves standard cache path for rain logs.
+func DefaultLogDir() string {
+	base, err := os.UserCacheDir()
+	if err != nil {
+		return filepath.Join(os.TempDir(), "git-rain", "logs")
+	}
+	return filepath.Join(base, "git-rain", "logs")
+}

internal/sessionlog/logger_test.go

@@ -0,0 +1,68 @@
+package sessionlog
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestDefaultLogDir(t *testing.T) {
+	dir := DefaultLogDir()
+	if dir == "" {
+		t.Fatal("DefaultLogDir() should not be empty")
+	}
+	if !strings.Contains(dir, filepath.Join("git-rain", "logs")) {
+		t.Fatalf("unexpected DefaultLogDir: %s", dir)
+	}
+}
+
+func TestLogger_WritesJSONL(t *testing.T) {
+	logger, err := NewLogger(t.TempDir())
+	if err != nil {
+		t.Fatalf("NewLogger() error = %v", err)
+	}
+	logger.Info("repo", "scan", "repo discovered")
+	logger.Success("repo", "scan-complete", "done", time.Second)
+	if err := logger.Close(); err != nil {
+		t.Fatalf("Close() error = %v", err)
+	}
+
+	data, err := os.ReadFile(logger.LogPath())
+	if err != nil {
+		t.Fatalf("ReadFile() error = %v", err)
+	}
+	lines := strings.Split(strings.TrimSpace(string(data)), "\n")
+	if len(lines) < 3 {
+		t.Fatalf("expected at least 3 log lines, got %d", len(lines))
+	}
+	for _, line := range lines {
+		var entry LogEntry
+		if err := json.Unmarshal([]byte(line), &entry); err != nil {
+			t.Fatalf("invalid JSON line %q: %v", line, err)
+		}
+	}
+}
+
+func TestLogger_Subscribe(t *testing.T) {
+	logger, err := NewLogger(t.TempDir())
+	if err != nil {
+		t.Fatalf("NewLogger() error = %v", err)
+	}
+	defer func() { _ = logger.Close() }()
+
+	seen := make(chan LogEntry, 1)
+	logger.Subscribe(func(e LogEntry) { seen <- e })
+	logger.Info("repo", "scan", "repo discovered")
+
+	select {
+	case entry := <-seen:
+		if entry.Action != "scan" {
+			t.Fatalf("entry.Action = %q, want scan", entry.Action)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("did not receive subscribed log event")
+	}
+}

internal/ui/repo_selector.go

@@ -14,6 +14,7 @@ import (
 	"github.com/git-rain/git-rain/internal/config"
 	"github.com/git-rain/git-rain/internal/git"
 	"github.com/git-rain/git-rain/internal/registry"
+	"github.com/git-rain/git-rain/internal/sessionlog"
 )
 
 // ErrCancelled is returned by RunRepoSelector when the user cancels the TUI.
@@ -171,6 +172,13 @@ type RepoSelectorModel struct {
 	cfgPath       string
 	configCursor  int
 	configSaveErr error
+
+	logger        *sessionlog.Logger
+	showLogPanel  bool
+	statusLine    string
+	statusIcon    string
+	logEntries    []sessionlog.LogEntry
+	logExportPath string
 }
 
 // NewRepoSelectorModel creates a new repo selector model (static mode).
@@ -208,6 +216,8 @@ func NewRepoSelectorModel(repos []git.Repository, reg *registry.Registry, regPat
 		currentStartupQuote:  randomStartupRainQuote(),
 		startupQuoteVisible:  true,
 		quoteTickActive:      true,
+		statusLine:           "selector ready",
+		statusIcon:           "ℹ️",
 	}
 }
 
@@ -286,6 +296,8 @@ func NewRepoSelectorModelStream(
 		currentStartupQuote:  randomStartupRainQuote(),
 		startupQuoteVisible:  showStartupQuote,
 		quoteTickActive:      showStartupQuote && startupQuoteIntervalSec > 0,
+		statusLine:           "scan starting",
+		statusIcon:           "🔍",
 	}
 }
 
@@ -303,6 +315,24 @@ func (m RepoSelectorModel) Init() tea.Cmd {
 	return tea.Batch(cmds...)
 }
 
+func (m *RepoSelectorModel) recordStatus(level, action, description string) {
+	entry := sessionlog.LogEntry{
+		Timestamp:   time.Now(),
+		Level:       level,
+		Action:      action,
+		Description: description,
+	}
+	m.statusIcon = statusGlyph(entry)
+	m.statusLine = description
+	m.logEntries = append(m.logEntries, entry)
+	if len(m.logEntries) > 200 {
+		m.logEntries = m.logEntries[len(m.logEntries)-200:]
+	}
+	if m.logger != nil {
+		_ = m.logger.Log(entry)
+	}
+}
+
 func (m RepoSelectorModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	var cmds []tea.Cmd
 
@@ -321,15 +351,18 @@ func (m RepoSelectorModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		if m.scanChan != nil {
 			cmds = append(cmds, waitForRepo(m.scanChan))
 		}
+		m.recordStatus("info", "scan-repo", fmt.Sprintf("discovered %s", repo.Name))
 
 	case scanProgressMsg:
 		m.scanCurrentPath = string(msg)
 		if m.progressChan != nil && !m.progDone {
 			cmds = append(cmds, waitForProgress(m.progressChan))
 		}
+		m.recordStatus("info", "scan-progress", fmt.Sprintf("scanning %s", m.scanCurrentPath))
 
 	case repoChanDoneMsg:
 		m.scanDone = true
+		m.recordStatus("success", "scan-complete", "scan complete")
 
 	case progressChanDoneMsg:
 		m.progDone = true
@@ -479,6 +512,23 @@ func (m RepoSelectorModel) updateMainView(msg tea.KeyMsg, cmds []tea.Cmd) (tea.M
 			m = m.saveConfig()
 		}
 
+	case "L":
+		m.showLogPanel = !m.showLogPanel
+		if m.showLogPanel {
+			m.recordStatus("info", "log-panel-open", "log panel opened")
+		} else {
+			m.recordStatus("info", "log-panel-close", "log panel closed")
+		}
+
+	case "e":
+		path, err := exportLogEntriesText(m.logEntries)
+		if err != nil {
+			m.recordStatus("error", "log-export-failed", err.Error())
+		} else {
+			m.logExportPath = path
+			m.recordStatus("success", "log-exported", fmt.Sprintf("exported log to %s", path))
+		}
+
 	case "i":
 		m.ignoredEntries = IgnoredRegistryEntries(m.reg)
 		m.ignoredCursor = 0
@@ -1000,8 +1050,10 @@ func RunRepoSelectorStream(
 	cfgPath string,
 	reg *registry.Registry,
 	regPath string,
+	logger *sessionlog.Logger,
 ) ([]git.Repository, error) {
 	model := NewRepoSelectorModelStream(scanChan, progressChan, scanDisabled, scanDisabledRunOnly, cfg, cfgPath, reg, regPath)
+	model.logger = logger
 	p := tea.NewProgram(model, tea.WithAltScreen())
 
 	finalModel, err := p.Run()