From 04bacc19fb48aed9d52cdf39b8c6fd82bc1692dd Mon Sep 17 00:00:00 2001
From: Luxferre <lux@ferre>
Date: Sun, 22 Mar 2026 18:31:01 +0200
Subject: [PATCH] tui: implement history navigation key handlers

---
 cmd/sidekick-tui/main.go | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/cmd/sidekick-tui/main.go b/cmd/sidekick-tui/main.go
index 0ec4a22..27f2be4 100644
--- a/cmd/sidekick-tui/main.go
+++ b/cmd/sidekick-tui/main.go
@@ -353,6 +353,41 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
     case tea.KeyCtrlJ:
       m.textarea.InsertString("\n")
       return m, nil
+    case tea.KeyUp:
+      if m.textarea.Line() == 0 {
+        userMsgs := m.userMessages()
+        if len(userMsgs) == 0 {
+          return m, nil
+        }
+        if m.historyIndex == -1 {
+          m.promptDraft = m.textarea.Value()
+          m.historyIndex = len(userMsgs) - 1
+        } else if m.historyIndex > 0 {
+          m.historyIndex--
+        } else {
+          return m, nil
+        }
+        m.textarea.SetValue(userMsgs[m.historyIndex])
+        m.textarea.CursorEnd()
+        return m, nil
+      }
+    case tea.KeyDown:
+      if m.textarea.Line() == m.textarea.LineCount()-1 {
+        if m.historyIndex == -1 {
+          return m, nil
+        }
+        userMsgs := m.userMessages()
+        if m.historyIndex < len(userMsgs)-1 {
+          m.historyIndex++
+          m.textarea.SetValue(userMsgs[m.historyIndex])
+          m.textarea.CursorStart()
+        } else {
+          m.historyIndex = -1
+          m.textarea.SetValue(m.promptDraft)
+          m.textarea.CursorStart()
+        }
+        return m, nil
+      }
     case tea.KeyEnter:
       v := m.textarea.Value()
       if strings.TrimSpace(v) == "" || m.isThinking {
@@ -368,6 +403,8 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
         m.currentReasoning = ""
         m.transientSteps = nil
         m.textarea.Reset()
+        m.historyIndex = -1
+        m.promptDraft = ""
         m.updateViewportContent()
         m.viewport.GotoBottom()
         return m, nil
@@ -377,6 +414,8 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
         Role:    sidekick.MessageRoleUser,
         Content: v,
       })
+      m.historyIndex = -1
+      m.promptDraft = ""
       m.currentStream = ""
       m.currentReasoning = ""
       m.transientSteps = nil