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package eventstream
import (
"encoding/csv"
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
)
func defaultStreamExportFilename() string {
return fmt.Sprintf("ior-stream-%s.csv", time.Now().Format("20060102-150405"))
}
func exportSnapshotToCSV(source Source, filter Filter, exportDir, filename string) (string, error) {
name := strings.TrimSpace(filename)
if name == "" {
name = defaultStreamExportFilename()
}
rows := make([]StreamEvent, 0)
if source != nil {
snapshot := source.Snapshot()
rows = make([]StreamEvent, 0, len(snapshot))
for i := range snapshot {
ev := snapshot[i]
if filter.Matches(&ev) {
rows = append(rows, ev)
}
}
}
return exportRowsToCSV(rows, exportDir, name)
}
func exportRowsToCSV(rows []StreamEvent, exportDir, filename string) (string, error) {
name, err := ensureCSVFilename(filename)
if err != nil {
return "", err
}
path := name
if exportDir != "" {
path = filepath.Join(exportDir, name)
}
f, err := os.Create(path)
if err != nil {
return "", err
}
closed := false
closeFile := func() error {
if closed {
return nil
}
closed = true
return f.Close()
}
fail := func(baseErr error) (string, error) {
if closeErr := closeFile(); closeErr != nil {
return "", errors.Join(baseErr, closeErr)
}
return "", baseErr
}
w := csv.NewWriter(f)
header := []string{"seq", "time_ns", "gap_ns", "latency_ns", "comm", "pid", "tid", "syscall", "fd", "ret", "bytes", "file", "error"}
if err := w.Write(header); err != nil {
return fail(err)
}
for i := range rows {
ev := rows[i]
record := []string{
fmt.Sprintf("%d", ev.Seq),
fmt.Sprintf("%d", ev.TimeNs),
fmt.Sprintf("%d", ev.GapNs),
fmt.Sprintf("%d", ev.DurationNs),
ev.Comm,
fmt.Sprintf("%d", ev.PID),
fmt.Sprintf("%d", ev.TID),
ev.Syscall,
fmt.Sprintf("%d", ev.FD),
fmt.Sprintf("%d", ev.RetVal),
fmt.Sprintf("%d", ev.Bytes),
ev.FileName,
fmt.Sprintf("%t", ev.IsError),
}
if err := w.Write(record); err != nil {
return fail(err)
}
}
w.Flush()
if err := w.Error(); err != nil {
return fail(err)
}
if err := closeFile(); err != nil {
return "", err
}
absPath, err := filepath.Abs(path)
if err != nil {
return path, nil
}
return absPath, nil
}
func ensureCSVFilename(name string) (string, error) {
clean := strings.TrimSpace(name)
if clean == "" {
return "", errors.New("filename cannot be empty")
}
if strings.HasSuffix(strings.ToLower(clean), ".csv") {
return clean, nil
}
return clean + ".csv", nil
}
// ExportSnapshotToCSV exports a fresh filtered snapshot from the current source
// without mutating the model's paused/live view state.
func (m Model) ExportSnapshotToCSV(filename string) (string, error) {
return exportSnapshotToCSV(m.source, m.filter, m.exportDir, filename)
}
func (m *Model) exportFilteredToCSV(filename string) (string, error) {
return exportRowsToCSV(m.filtered, m.exportDir, filename)
}
// EditorCommandForPath builds an editor command for the given path.
func EditorCommandForPath(path string) (*exec.Cmd, error) {
parts, _, err := resolveEditorCommand()
if err != nil {
return nil, err
}
args := append(parts[1:], path)
return exec.Command(parts[0], args...), nil
}
func resolveEditorCommand() ([]string, string, error) {
candidates := []string{"EDITOR", "VISUAL", "SUDO_EDITOR"}
for _, key := range candidates {
value := strings.TrimSpace(os.Getenv(key))
if value == "" {
continue
}
parts := strings.Fields(value)
if len(parts) == 0 {
continue
}
return parts, key, nil
}
return []string{fallbackEditor()}, "fallback", nil
}
func fallbackEditor() string {
if _, err := exec.LookPath("hx"); err == nil {
return "hx"
}
return "vi"
}
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