task 375: show active global filter in dashboard help

4 files changed, 49 insertions, 11 deletions

diff --git a/internal/tui/common/keys.go b/internal/tui/common/keys.go
index bf356ee..fd7bef1 100644
--- a/internal/tui/common/keys.go
+++ b/internal/tui/common/keys.go
@@ -92,6 +92,7 @@ func (k KeyMap) DashboardStatusHelpSections() []HelpSection {
 		k.Seven,
 		k.Visualize,
 		k.Metric,
+		k.Filter,
 		k.SelectPID,
 		k.SelectTID,
 		k.Probes,
@@ -106,11 +107,7 @@ func (k KeyMap) DashboardStatusHelpSections() []HelpSection {
 		k.Visualize,
 		k.Metric,
 		helpTextBinding("space", "stream pause"),
-		helpTextBinding("f", "stream filter"),
 		helpTextBinding("g/G", "stream top/tail"),
-		helpTextBinding("c", "stream clear"),
-		helpTextBinding("enter", "stream add filter"),
-		helpTextBinding("esc", "stream undo filter"),
 		helpTextBinding("left/right", "stream col"),
 		helpTextBinding("h/l", "stream col"),
 		helpTextBinding("j/k", "scroll"),
@@ -135,18 +132,14 @@ func (k KeyMap) DashboardFullHelp() [][]key.Binding {
 		controls = append(controls, k.Export)
 	}
 	controls = append(controls, k.DirGroup, k.SelectPID, k.SelectTID, k.Probes, k.Refresh, k.Quit)
-	controls = append(controls, k.Visualize, k.Metric)
+	controls = append(controls, k.Visualize, k.Metric, k.Filter)
 
 	return [][]key.Binding{
 		{k.One, k.Two, k.Three, k.Four, k.Five, k.Six, k.Seven},
 		controls,
 		{
 			helpTextBinding("space", "stream pause"),
-			helpTextBinding("f", "stream filter"),
 			helpTextBinding("g/G", "stream top/tail"),
-			helpTextBinding("c", "stream clear"),
-			helpTextBinding("enter", "stream add filter"),
-			helpTextBinding("esc", "stream undo filter"),
 			helpTextBinding("left/right", "stream col"),
 			helpTextBinding("h/l", "stream col"),
 			helpTextBinding("j/k", "scroll"),
diff --git a/internal/tui/dashboard/model.go b/internal/tui/dashboard/model.go
index 5b13642..c5effe2 100644
--- a/internal/tui/dashboard/model.go
+++ b/internal/tui/dashboard/model.go
@@ -64,6 +64,7 @@ type Model struct {
 
 	refreshEvery             time.Duration
 	keys                     common.KeyMap
+	globalFilter             globalfilter.Filter
 	pidFilter                int
 	syscallsOffset           int
 	syscallsTreemapSelection int
@@ -538,6 +539,7 @@ func (m *Model) SetStreamSource(source eventstream.Source) {
 // SetGlobalFilter forwards the shared TUI filter into the stream tab so
 // buffered rows can be re-filtered immediately.
 func (m *Model) SetGlobalFilter(filter globalfilter.Filter) {
+	m.globalFilter = filter.Clone()
 	m.streamModel.SetFilter(eventstream.Filter(filter))
 }
 
@@ -602,13 +604,17 @@ func (m Model) View() tea.View {
 	b.WriteString(m.renderActiveContent(width, activeHeight, &streamModel))
 	b.WriteString("\n")
 	if m.showHelp {
-		b.WriteString(renderHelpBar(m.keys, width))
+		b.WriteString(renderHelpBarWithStatus(m.keys, width, m.filterSummary()))
 	} else {
-		b.WriteString(renderHelpHint(width))
+		b.WriteString(renderHelpHintWithStatus(width, m.filterSummary()))
 	}
 	return tea.NewView(common.ScreenStyle.Render(b.String()))
 }
 
+func (m Model) filterSummary() string {
+	return "filter: " + m.globalFilter.Summary()
+}
+
 func (m Model) renderActiveContent(width, activeHeight int, streamModel *eventstream.Model) string {
 	if m.activeTab == TabSyscalls && m.syscallsVizMode == tabVizModeTreemap {
 		return renderSyscallsTreemap(m.latest, width, activeHeight, m.syscallsChart.Metric(), m.syscallsTreemapSelection, m.isDark)
diff --git a/internal/tui/dashboard/tabs.go b/internal/tui/dashboard/tabs.go
index 5d15acc..ab9365f 100644
--- a/internal/tui/dashboard/tabs.go
+++ b/internal/tui/dashboard/tabs.go
@@ -119,6 +119,10 @@ func renderTabBar(active Tab, width int) string {
 }
 
 func renderHelpBar(keys common.KeyMap, width int) string {
+	return renderHelpBarWithStatus(keys, width, "")
+}
+
+func renderHelpBarWithStatus(keys common.KeyMap, width int, status string) string {
 	sections := keys.DashboardStatusHelpSections()
 	lines := make([]string, 0, len(sections))
 	for _, section := range sections {
@@ -133,6 +137,9 @@ func renderHelpBar(keys common.KeyMap, width int) string {
 		}
 		lines = append(lines, line)
 	}
+	if status != "" && len(lines) > 0 {
+		lines[len(lines)-1] = appendStatusText(lines[len(lines)-1], status, width)
+	}
 	text := strings.Join(lines, "\n")
 	if width > 0 && width < 90 {
 		return text
@@ -141,13 +148,31 @@ func renderHelpBar(keys common.KeyMap, width int) string {
 }
 
 func renderHelpHint(width int) string {
+	return renderHelpHintWithStatus(width, "")
+}
+
+func renderHelpHintWithStatus(width int, status string) string {
 	hint := "press H for help"
+	if status != "" {
+		hint = appendStatusText(hint, status, width)
+	}
 	if width > 0 && width < 90 {
 		return hint
 	}
 	return common.HelpBarStyle.Width(width).Render(hint)
 }
 
+func appendStatusText(base, status string, width int) string {
+	if status == "" {
+		return base
+	}
+	line := base + " | " + status
+	if width > 0 {
+		return truncatePlain(line, width)
+	}
+	return line
+}
+
 func wrapHelpLines(parts []string, width int) (string, string) {
 	if len(parts) == 0 {
 		return "", ""
diff --git a/internal/tui/dashboard/tabs_test.go b/internal/tui/dashboard/tabs_test.go
index 16f8b76..54a1d16 100644
--- a/internal/tui/dashboard/tabs_test.go
+++ b/internal/tui/dashboard/tabs_test.go
@@ -55,3 +55,17 @@ func TestRenderHelpBarSmallWidthCanWrapToTwoLines(t *testing.T) {
 		t.Fatalf("expected Dashboard section line, got %q", lines[1])
 	}
 }
+
+func TestRenderHelpHintWithStatusIncludesFilterSummary(t *testing.T) {
+	out := renderHelpHintWithStatus(120, "filter: syscall~read")
+	if !strings.Contains(out, "filter: syscall~read") {
+		t.Fatalf("expected filter summary in help hint, got %q", out)
+	}
+}
+
+func TestRenderHelpBarWithStatusIncludesFilterSummary(t *testing.T) {
+	out := renderHelpBarWithStatus(common.DefaultKeyMap(), 0, "filter: pid=42")
+	if !strings.Contains(out, "filter: pid=42") {
+		t.Fatalf("expected filter summary in help bar, got %q", out)
+	}
+}