tui: add dashboard processes table tab

1 files changed, 75 insertions, 0 deletions

diff --git a/internal/tui/dashboard/processes.go b/internal/tui/dashboard/processes.go
new file mode 100644
index 0000000..d229c10
--- /dev/null
+++ b/internal/tui/dashboard/processes.go
@@ -0,0 +1,75 @@
+package dashboard
+
+import (
+	"fmt"
+	"ior/internal/flags"
+	"ior/internal/statsengine"
+	"strconv"
+	"strings"
+
+	"github.com/charmbracelet/bubbles/table"
+)
+
+func renderProcesses(snap *statsengine.Snapshot, width, height int) string {
+	return renderProcessesWithOffset(snap, width, height, 0)
+}
+
+func renderProcessesWithOffset(snap *statsengine.Snapshot, width, height, offset int) string {
+	if snap == nil {
+		return "Processes: waiting for stats..."
+	}
+
+	rows := processRows(snap.Processes())
+	if len(rows) == 0 {
+		return "Processes: no data"
+	}
+
+	columns := []table.Column{
+		{Title: "PID", Width: 8},
+		{Title: "Comm", Width: 18},
+		{Title: "Syscalls", Width: 10},
+		{Title: "Rate/s", Width: 8},
+		{Title: "Total Bytes", Width: 12},
+		{Title: "Avg Latency", Width: 12},
+	}
+
+	tbl := table.New(
+		table.WithColumns(columns),
+		table.WithRows(rows),
+		table.WithFocused(true),
+	)
+	tbl.SetHeight(syscallTableHeight(height))
+	tbl.SetWidth(tableWidth(width))
+	tbl.SetCursor(clampOffset(offset, len(rows)))
+
+	out := tbl.View()
+	if flags.Get().PidFilter > 0 {
+		out += "\n" + "Note: this tab is most useful with All PIDs."
+	}
+	return out
+}
+
+func processRows(processes []statsengine.ProcessSnapshot) []table.Row {
+	rows := make([]table.Row, 0, len(processes))
+	for _, p := range processes {
+		rows = append(rows, table.Row{
+			strconv.FormatUint(uint64(p.PID), 10),
+			truncateText(p.Comm, 18),
+			strconv.FormatUint(p.Syscalls, 10),
+			fmt.Sprintf("%.1f", p.RatePerSec),
+			formatBytes(float64(p.Bytes)),
+			formatDurationNs(p.AvgLatencyNs),
+		})
+	}
+	return rows
+}
+
+func truncateText(value string, limit int) string {
+	if len(value) <= limit {
+		return value
+	}
+	if limit <= 3 {
+		return value[:limit]
+	}
+	return strings.TrimSpace(value[:limit-3]) + "..."
+}