feat: v0.5.0 terminal search, keyword alerts, TeraTerm-compatible TTL

Search (Ctrl+F):
- in-terminal search bar over full scrollback + screen; all hits
  highlighted, current hit emphasized; Enter searches upward,
  Shift+Enter downward, F3/Esc shortcuts
- hits anchored via ScreenBuffer.DroppedLines so positions stay
  correct as the ring buffer drops old lines

Keyword highlighting & tab alerts:
- new Settings -> Highlight page: user-defined keyword list with
  per-rule enable and a global toggle (AppSettings.KeywordRules)
- keywords highlighted red in every terminal (visible rows only,
  case-insensitive); background tabs flash a red dot when a keyword
  appears, cleared when the tab is opened

TTL engine (TeraTerm macro compatibility):
- new TtlExpression parser: parens, and/or/xor/not, comparisons,
  * / % + -, hex literals (0x/$), string/int values; legacy fallback
  keeps old scripts working
- control flow: goto, call/return (inline, usable inside loops),
  for/next, do/loop [while|until], until/enduntil, break, continue,
  end, exit, include, mpause; one-line "if <expr> <statement>"
- waits: waitln, waitregex (matchstr/groupmatchstr1-9), recvln,
  multi-string wait (TeraTerm semantics), mtimeout
- strings: strlen strcompare strconcat strcopy strinsert strremove
  strmatch strscan strreplace strtrim strsplit strjoin tolower
  toupper str2int int2str code2str str2code sprintf expandenv
- files: fileopen filereadln filewrite(ln) fileclose filecreate
  filedelete filesearch basename dirname makepath foldercreate
  folderdelete foldersearch getdir setdir
- misc: beep getdate gettime getenv setenv random exec getver
  getttdir uptime ifdefined clipb2var var2clipb inputbox yesnobox
  crc32 checksum8/16/32 dispstr
- serial: sendbreak setbaud setdtr setrts sendfile (SerialChannel
  gains SendBreak/SetBaudRate/SetDtr/SetRts)
- script Output (incl. dispstr) now echoed gray into the terminal
- quote-aware comment stripping; case-insensitive variables

Docs:
- docs/ttl-script-reference.md rewritten: ETTerms-only commands
  first, then the TeraTerm-shared set, with examples

Misc:
- version 0.5.0; About changelog; CLAUDE.md v0.5.0 notes
- restore ETTerms.PduCore ProjectReference in ETTerms/PduMcp csproj
  (was dropped in the working tree; required to compile)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/ETTerms/App/AboutView.cs

@@ -183,6 +183,15 @@ public sealed class AboutView : UserControl
 
     private static readonly ChangelogEntry[] Changelog =
     [
+        new("0.5.0", new DateOnly(2026, 7, 2), "Search, keyword alerts & a much bigger scripting language",
+        [
+            "Press Ctrl+F in any terminal to search everything you've scrolled past — all hits are highlighted, Enter jumps between them.",
+            "New Settings → Highlight page: add your own keywords (like ERROR or FAIL) and they light up in red wherever they appear.",
+            "When a keyword shows up in a tab you're not looking at, that tab's dot turns red so you don't miss it.",
+            "TTL scripting grew from ~15 commands to 90+, matching Tera Term macros: loops (for / do / until), goto and subroutines, waitln / waitregex with regex capture, string and file operations, input dialogs, and serial line control (sendbreak, setbaud).",
+            "Scripts now show their progress in gray right inside the terminal, so you can watch what they're doing.",
+            "See the full command table with examples in docs/ttl-script-reference.md.",
+        ]),
         new("0.4.0", new DateOnly(2026, 7, 2), "Performance & stability overhaul",
         [
             "The terminal is much smoother during heavy output (long boot logs, big file dumps) — drawing and scroll history were reworked to stay fast no matter how much text has scrolled by.",

src/ETTerms/App/SettingsView.cs

@@ -52,6 +52,7 @@ public sealed class SettingsView : UserControl
 
         var termBtn = MakeTab("Terminal", BuildTerminalTab());
         tabBar.Controls.Add(termBtn);
+        tabBar.Controls.Add(MakeTab("Highlight", BuildHighlightTab()));
         tabBar.Controls.Add(MakeTab("AI MCP", BuildAiMcpTab()));
 
         Controls.Add(body);
@@ -171,6 +172,115 @@ public sealed class SettingsView : UserControl
         return page;
     }
 
+    // ═══ Highlight Tab ═══
+    private Panel BuildHighlightTab()
+    {
+        var page = new Panel { BackColor = Theme.WorkspaceBack, Padding = new Padding(20) };
+        var s = AppSettings.Instance;
+
+        var flow = new FlowLayoutPanel
+        {
+            Dock = DockStyle.Fill, FlowDirection = FlowDirection.TopDown,
+            WrapContents = false, BackColor = Theme.WorkspaceBack, AutoScroll = true
+        };
+
+        flow.Controls.Add(new Label
+        {
+            Text = "Keyword Highlighting", AutoSize = true,
+            ForeColor = Theme.Accent, Font = Theme.UiFontBold, Margin = new Padding(0, 0, 0, 4)
+        });
+        flow.Controls.Add(new Label
+        {
+            Text = "Keywords below are highlighted in red in every terminal (case-insensitive).\n" +
+                   "When a keyword appears in a background tab, that tab's dot turns red until you open it.",
+            AutoSize = false, Width = 520, Height = 34,
+            ForeColor = Theme.TextDim, Font = Theme.UiFont, Margin = new Padding(0, 0, 0, 8)
+        });
+
+        var enable = new CheckBox
+        {
+            Text = "Enable keyword highlighting", Checked = s.KeywordHighlightEnabled,
+            AutoSize = true, ForeColor = Theme.Text, Font = Theme.UiFont, Margin = new Padding(0, 0, 0, 8)
+        };
+        flow.Controls.Add(enable);
+
+        // 規則清單：每列 = 啟用勾選 + 關鍵字（可直接編輯）
+        var grid = new DataGridView
+        {
+            Width = 420, Height = 240,
+            BackgroundColor = Theme.WorkspaceBack, ForeColor = Theme.Text, GridColor = Theme.Border,
+            BorderStyle = BorderStyle.None, CellBorderStyle = DataGridViewCellBorderStyle.SingleHorizontal,
+            DefaultCellStyle = { BackColor = Theme.TabBack, ForeColor = Theme.Text, SelectionBackColor = Theme.Hover, SelectionForeColor = Theme.Text },
+            ColumnHeadersDefaultCellStyle = { BackColor = Theme.RailBack, ForeColor = Theme.Accent, Font = Theme.UiFontBold },
+            ColumnHeadersBorderStyle = DataGridViewHeaderBorderStyle.Single,
+            EnableHeadersVisualStyles = false, RowHeadersVisible = false,
+            AllowUserToAddRows = false, AllowUserToDeleteRows = false,
+            AllowUserToResizeRows = false, SelectionMode = DataGridViewSelectionMode.FullRowSelect,
+            Font = Theme.UiFont, RowTemplate = { Height = 24 }, Margin = new Padding(0, 0, 0, 8)
+        };
+        grid.Columns.Add(new DataGridViewCheckBoxColumn { Name = "On", HeaderText = "On", Width = 44 });
+        grid.Columns.Add(new DataGridViewTextBoxColumn
+        {
+            Name = "Keyword", HeaderText = "Keyword",
+            AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill
+        });
+        foreach (var r in s.KeywordRules) grid.Rows.Add(r.Enabled, r.Text);
+        flow.Controls.Add(grid);
+
+        // 新增 / 移除
+        var newKw = new TextBox { Width = 220, BackColor = Theme.TabBack, ForeColor = Theme.Text, Font = Theme.UiFont, BorderStyle = BorderStyle.FixedSingle };
+        var addBtn = MakeButton("Add", Theme.Accent);
+        var removeBtn = MakeButton("Remove Selected", Color.FromArgb(210, 120, 120));
+
+        void AddKeyword()
+        {
+            var t = newKw.Text.Trim();
+            if (t.Length == 0) return;
+            grid.Rows.Add(true, t);
+            newKw.Clear();
+            newKw.Focus();
+        }
+        addBtn.Click += (_, _) => AddKeyword();
+        newKw.KeyDown += (_, e) => { if (e.KeyCode == Keys.Enter) { AddKeyword(); e.Handled = e.SuppressKeyPress = true; } };
+        removeBtn.Click += (_, _) =>
+        {
+            foreach (DataGridViewRow row in grid.SelectedRows) grid.Rows.Remove(row);
+        };
+
+        var editRow = new FlowLayoutPanel
+        {
+            FlowDirection = FlowDirection.LeftToRight, AutoSize = true,
+            WrapContents = false, BackColor = Theme.WorkspaceBack, Margin = new Padding(0, 0, 0, 12)
+        };
+        editRow.Controls.Add(newKw);
+        editRow.Controls.Add(addBtn);
+        editRow.Controls.Add(removeBtn);
+        flow.Controls.Add(editRow);
+
+        var save = MakeButton("Save", Theme.Accent);
+        save.Margin = new Padding(0);
+        save.Click += (_, _) =>
+        {
+            grid.EndEdit();
+            s.KeywordHighlightEnabled = enable.Checked;
+            s.KeywordRules = grid.Rows.Cast<DataGridViewRow>()
+                .Select(r => new KeywordRule
+                {
+                    Enabled = r.Cells["On"].Value is true,
+                    Text = r.Cells["Keyword"].Value?.ToString()?.Trim() ?? ""
+                })
+                .Where(r => r.Text.Length > 0)
+                .ToList();
+            s.Save();
+            MessageBox.Show(this, "Highlight settings saved.\nThey apply immediately to all open sessions.",
+                "Highlight", MessageBoxButtons.OK, MessageBoxIcon.Information);
+        };
+        flow.Controls.Add(save);
+
+        page.Controls.Add(flow);
+        return page;
+    }
+
     // ═══ AI MCP Tab ═══
     private Panel BuildAiMcpTab()
     {

src/ETTerms/App/Workspace/WorkspaceView.cs

@@ -20,6 +20,7 @@ public sealed class WorkspaceView : UserControl
         public required SessionPage Page;
         public Rectangle TabBounds;
         public Rectangle CloseRect;
+        public bool Alert;   // 背景分頁出現高亮關鍵字 → 標紅點，切到該分頁時清除
     }
 
     private readonly FlowLayoutPanel _toolbar;
@@ -114,6 +115,12 @@ public sealed class WorkspaceView : UserControl
         var page = BuildPage(conn);
         var s = new Session { Title = conn.Name, IsSsh = conn.IsSsh, Page = page };
         page.ConnectFailed += msg => OnConnectFailed(s, msg);
+        page.KeywordAlert += _ =>
+        {
+            if (s == _active || s.Alert) return;
+            s.Alert = true;
+            _tabStrip.Invalidate();
+        };
         _sessions.Add(s);
         _active = s;
         Relayout();
@@ -191,6 +198,7 @@ public sealed class WorkspaceView : UserControl
         }
         _empty.Visible = false;
         _active ??= _sessions[0];
+        _active.Alert = false;   // 使用者正在看這個分頁，警示清除
 
         int cells = _rows * _cols;
         int activeIdx = _sessions.IndexOf(_active);
@@ -360,7 +368,8 @@ public sealed class WorkspaceView : UserControl
             if (drag)
                 using (var pen = new Pen(Theme.Accent, 1))
                     g.DrawRectangle(pen, new Rectangle(s.TabBounds.Left, s.TabBounds.Top, s.TabBounds.Width - 1, s.TabBounds.Height - 1));
-            using (var dot = new SolidBrush(s.IsSsh ? Theme.SshColor : Theme.SerialColor))
+            // 警示中的背景分頁：型別圓點改紅色，切過去看時清除
+            using (var dot = new SolidBrush(s.Alert ? Color.FromArgb(235, 85, 85) : s.IsSsh ? Theme.SshColor : Theme.SerialColor))
                 g.FillEllipse(dot, s.TabBounds.Left + 9, StripH / 2 - 4, 8, 8);
             var tr = new Rectangle(s.TabBounds.Left + 22, s.TabBounds.Top, s.TabBounds.Width - 22 - CloseSz - 10, StripH);
             TextRenderer.DrawText(g, s.Title, Theme.UiFont, tr, active ? Theme.Text : Theme.TextDim,

src/ETTerms/ETTerms.csproj

@@ -10,7 +10,7 @@
     <AssemblyName>ETTerms</AssemblyName>
 
     <!-- 版本資訊 -->
-    <Version>0.4.0</Version>
+    <Version>0.5.0</Version>
     <Product>ETTerms</Product>
     <Company>ETTerms Project</Company>
 
@@ -51,9 +51,9 @@
       <_McpSelfContained Condition="'$(SelfContained)' != ''">$(SelfContained)</_McpSelfContained>
       <_McpSelfContained Condition="'$(SelfContained)' == ''">false</_McpSelfContained>
     </PropertyGroup>
-    <Message Importance="high" Text="[ETTerms] Publishing ETTerms.SerialMcp -> $(PublishDir)ETTerms.SerialMcp (self-contained=$(_McpSelfContained))" />
+    <Message Importance="high" Text="[ETTerms] Publishing ETTerms.SerialMcp -&gt; $(PublishDir)ETTerms.SerialMcp (self-contained=$(_McpSelfContained))" />
     <Exec Command="dotnet publish &quot;$(MSBuildThisFileDirectory)..\ETTerms.SerialMcp\ETTerms.SerialMcp.csproj&quot; -c $(Configuration) -r $(_McpRid) --self-contained $(_McpSelfContained) -o &quot;$(PublishDir)ETTerms.SerialMcp&quot;" />
-    <Message Importance="high" Text="[ETTerms] Publishing ETTerms.PduMcp -> $(PublishDir)ETTerms.PduMcp (self-contained=$(_McpSelfContained))" />
+    <Message Importance="high" Text="[ETTerms] Publishing ETTerms.PduMcp -&gt; $(PublishDir)ETTerms.PduMcp (self-contained=$(_McpSelfContained))" />
     <Exec Command="dotnet publish &quot;$(MSBuildThisFileDirectory)..\ETTerms.PduMcp\ETTerms.PduMcp.csproj&quot; -c $(Configuration) -r $(_McpRid) --self-contained $(_McpSelfContained) -o &quot;$(PublishDir)ETTerms.PduMcp&quot;" />
   </Target>
 

src/ETTerms/Infrastructure/AppSettings.cs

@@ -27,6 +27,10 @@ public sealed class AppSettings
     public string ShellType { get; set; } = "PowerShell";       // PowerShell, Bash, Cmd
     public string ShellStartupDir { get; set; } = "";
 
+    // ── Keyword highlight（終端機關鍵字標色 + 分頁警示；Settings → Highlight 分頁設定）──
+    public bool KeywordHighlightEnabled { get; set; } = true;
+    public List<KeywordRule> KeywordRules { get; set; } = new();
+
     // ── Window ──
     public int WindowX { get; set; } = -1;
     public int WindowY { get; set; } = -1;
@@ -83,3 +87,10 @@ public sealed class AppSettings
         return new();
     }
 }
+
+/// <summary>一條關鍵字高亮規則：關鍵字文字 + 是否啟用（比對不分大小寫）。</summary>
+public sealed class KeywordRule
+{
+    public string Text { get; set; } = "";
+    public bool Enabled { get; set; } = true;
+}

src/ETTerms/Scripting/TtlExpression.cs

@@ -0,0 +1,253 @@
+using System.Globalization;
+
+namespace ETTerms.Scripting;
+
+/// <summary>
+/// TTL 運算式解析 / 求值器（v0.5.0，供 if / elseif / while / until / for / 變數指派使用）。
+///
+/// 支援：
+///   - 整數：十進位、<c>0x1F</c>、<c>$1F</c>（TeraTerm 十六進位）
+///   - 字串常值：<c>'...'</c> 或 <c>"..."</c>
+///   - 變數（由呼叫端 resolver 解析；未定義視為 0）
+///   - 括號、一元 <c>-</c> / <c>not</c> / <c>!</c> / <c>~</c>
+///   - 算術 <c>* / % + -</c>
+///   - 比較 <c>= == &lt;&gt; != &gt; &lt; &gt;= &lt;=</c>（兩邊皆可為整數時用數值比較，否則字串比較）
+///   - 邏輯 <c>and or xor</c>（同義：<c>&amp;&amp; ||</c>）
+///
+/// 值為 <see cref="object"/>：int 或 string；比較 / 邏輯運算結果為 int 1/0。
+/// </summary>
+public static class TtlExpression
+{
+    /// <summary>求值整段文字；結尾若有多餘內容視為錯誤（FormatException）。</summary>
+    public static object Evaluate(string text, Func<string, object?> resolve)
+    {
+        int pos = 0;
+        var v = ParseOr(text, ref pos, resolve);
+        SkipWs(text, ref pos);
+        if (pos < text.Length) throw new FormatException($"unexpected '{text[pos..]}'");
+        return v;
+    }
+
+    /// <summary>從 <paramref name="pos"/> 起解析一個運算式，pos 停在運算式之後（供單行 if 判斷剩餘 statement）。</summary>
+    public static object Parse(string text, ref int pos, Func<string, object?> resolve)
+        => ParseOr(text, ref pos, resolve);
+
+    public static bool Truthy(object? v) => ToInt(v) != 0;
+
+    public static int ToInt(object? v) => v switch
+    {
+        int i => i,
+        string s when TryParseInt(s.Trim(), out int r) => r,
+        _ => 0
+    };
+
+    public static string ToStr(object? v) => v switch
+    {
+        null => "",
+        string s => s,
+        _ => v.ToString() ?? ""
+    };
+
+    // ── 文法（優先序低 → 高）─────────────────────────────────
+    private static object ParseOr(string s, ref int p, Func<string, object?> r)
+    {
+        var v = ParseAnd(s, ref p, r);
+        while (true)
+        {
+            SkipWs(s, ref p);
+            if (MatchWord(s, ref p, "or") || MatchOp(s, ref p, "||"))
+                v = (Truthy(v) | Truthy(ParseAnd(s, ref p, r))) ? 1 : 0;
+            else if (MatchWord(s, ref p, "xor"))
+                v = (Truthy(v) ^ Truthy(ParseAnd(s, ref p, r))) ? 1 : 0;
+            else return v;
+        }
+    }
+
+    private static object ParseAnd(string s, ref int p, Func<string, object?> r)
+    {
+        var v = ParseCompare(s, ref p, r);
+        while (true)
+        {
+            SkipWs(s, ref p);
+            if (MatchWord(s, ref p, "and") || MatchOp(s, ref p, "&&"))
+                v = (Truthy(v) & Truthy(ParseCompare(s, ref p, r))) ? 1 : 0;
+            else return v;
+        }
+    }
+
+    private static object ParseCompare(string s, ref int p, Func<string, object?> r)
+    {
+        var l = ParseAdd(s, ref p, r);
+        SkipWs(s, ref p);
+        string? op =
+            MatchOp(s, ref p, ">=") ? ">=" :
+            MatchOp(s, ref p, "<=") ? "<=" :
+            MatchOp(s, ref p, "<>") ? "!=" :
+            MatchOp(s, ref p, "==") ? "==" :
+            MatchOp(s, ref p, "!=") ? "!=" :
+            MatchOp(s, ref p, "=") ? "==" :
+            MatchOp(s, ref p, ">") ? ">" :
+            MatchOp(s, ref p, "<") ? "<" : null;
+        if (op == null) return l;
+
+        var rt = ParseAdd(s, ref p, r);
+
+        // 兩邊皆可為整數 → 數值比較；否則字串比較（僅 == / !=；大小比較退回數值 0）
+        bool numeric = l is int || rt is int
+            || (TryParseInt(ToStr(l).Trim(), out _) && TryParseInt(ToStr(rt).Trim(), out _));
+        if (numeric)
+        {
+            int a = ToInt(l), b = ToInt(rt);
+            return op switch
+            {
+                "==" => a == b ? 1 : 0,
+                "!=" => a != b ? 1 : 0,
+                ">=" => a >= b ? 1 : 0,
+                "<=" => a <= b ? 1 : 0,
+                ">" => a > b ? 1 : 0,
+                _ => a < b ? 1 : 0
+            };
+        }
+        int cmp = string.CompareOrdinal(ToStr(l), ToStr(rt));
+        return op switch
+        {
+            "==" => cmp == 0 ? 1 : 0,
+            "!=" => cmp != 0 ? 1 : 0,
+            ">=" => cmp >= 0 ? 1 : 0,
+            "<=" => cmp <= 0 ? 1 : 0,
+            ">" => cmp > 0 ? 1 : 0,
+            _ => cmp < 0 ? 1 : 0
+        };
+    }
+
+    private static object ParseAdd(string s, ref int p, Func<string, object?> r)
+    {
+        var v = ParseMul(s, ref p, r);
+        while (true)
+        {
+            SkipWs(s, ref p);
+            if (MatchOp(s, ref p, "+")) v = ToInt(v) + ToInt(ParseMul(s, ref p, r));
+            else if (MatchOp(s, ref p, "-")) v = ToInt(v) - ToInt(ParseMul(s, ref p, r));
+            else return v;
+        }
+    }
+
+    private static object ParseMul(string s, ref int p, Func<string, object?> r)
+    {
+        var v = ParseUnary(s, ref p, r);
+        while (true)
+        {
+            SkipWs(s, ref p);
+            if (MatchOp(s, ref p, "*")) v = ToInt(v) * ToInt(ParseUnary(s, ref p, r));
+            else if (MatchOp(s, ref p, "/"))
+            {
+                int d = ToInt(ParseUnary(s, ref p, r));
+                v = d != 0 ? ToInt(v) / d : 0;
+            }
+            else if (MatchOp(s, ref p, "%"))
+            {
+                int d = ToInt(ParseUnary(s, ref p, r));
+                v = d != 0 ? ToInt(v) % d : 0;
+            }
+            else return v;
+        }
+    }
+
+    private static object ParseUnary(string s, ref int p, Func<string, object?> r)
+    {
+        SkipWs(s, ref p);
+        if (MatchOp(s, ref p, "-")) return -ToInt(ParseUnary(s, ref p, r));
+        if (MatchOp(s, ref p, "~")) return ~ToInt(ParseUnary(s, ref p, r));
+        if (MatchOp(s, ref p, "!")) return Truthy(ParseUnary(s, ref p, r)) ? 0 : 1;
+        if (MatchWord(s, ref p, "not")) return Truthy(ParseUnary(s, ref p, r)) ? 0 : 1;
+        return ParsePrimary(s, ref p, r);
+    }
+
+    private static object ParsePrimary(string s, ref int p, Func<string, object?> r)
+    {
+        SkipWs(s, ref p);
+        if (p >= s.Length) throw new FormatException("unexpected end of expression");
+
+        char c = s[p];
+        if (c == '(')
+        {
+            p++;
+            var v = ParseOr(s, ref p, r);
+            SkipWs(s, ref p);
+            if (p >= s.Length || s[p] != ')') throw new FormatException("missing ')'");
+            p++;
+            return v;
+        }
+        if (c is '\'' or '"')
+        {
+            char q = c;
+            int start = ++p;
+            while (p < s.Length && s[p] != q) p++;
+            if (p >= s.Length) throw new FormatException("unterminated string");
+            var str = s[start..p];
+            p++;
+            return str;
+        }
+        if (c == '$')   // TeraTerm 十六進位 $1F
+        {
+            int start = ++p;
+            while (p < s.Length && Uri.IsHexDigit(s[p])) p++;
+            if (p == start) throw new FormatException("invalid hex literal");
+            return int.Parse(s[start..p], NumberStyles.HexNumber, CultureInfo.InvariantCulture);
+        }
+        if (char.IsDigit(c))
+        {
+            if (c == '0' && p + 1 < s.Length && (s[p + 1] is 'x' or 'X'))
+            {
+                int hs = p + 2, hp = hs;
+                while (hp < s.Length && Uri.IsHexDigit(s[hp])) hp++;
+                if (hp == hs) throw new FormatException("invalid hex literal");
+                p = hp;
+                return int.Parse(s[hs..hp], NumberStyles.HexNumber, CultureInfo.InvariantCulture);
+            }
+            int ds = p;
+            while (p < s.Length && char.IsDigit(s[p])) p++;
+            return int.Parse(s[ds..p], CultureInfo.InvariantCulture);
+        }
+        if (char.IsLetter(c) || c == '_')
+        {
+            int ws = p;
+            while (p < s.Length && (char.IsLetterOrDigit(s[p]) || s[p] == '_')) p++;
+            return r(s[ws..p]) ?? 0;   // 未定義變數 → 0
+        }
+        throw new FormatException($"unexpected character '{c}'");
+    }
+
+    // ── 小工具 ───────────────────────────────────────────────
+    private static void SkipWs(string s, ref int p) { while (p < s.Length && char.IsWhiteSpace(s[p])) p++; }
+
+    private static bool MatchOp(string s, ref int p, string op)
+    {
+        if (p + op.Length > s.Length || !s.AsSpan(p, op.Length).SequenceEqual(op)) return false;
+        // "=" 不可吃掉 "=="、"<" 不可吃掉 "<=" / "<>"（呼叫端已按長度優先排序，這裡防呆單字元誤判）
+        if (op == "=" && p + 1 < s.Length && s[p + 1] == '=') return false;
+        if (op == ">" && p + 1 < s.Length && s[p + 1] == '=') return false;
+        if (op == "<" && p + 1 < s.Length && (s[p + 1] == '=' || s[p + 1] == '>')) return false;
+        p += op.Length;
+        return true;
+    }
+
+    private static bool MatchWord(string s, ref int p, string word)
+    {
+        if (p + word.Length > s.Length) return false;
+        if (!s.AsSpan(p, word.Length).Equals(word, StringComparison.OrdinalIgnoreCase)) return false;
+        int after = p + word.Length;
+        if (after < s.Length && (char.IsLetterOrDigit(s[after]) || s[after] == '_')) return false;   // 是識別字的一部分
+        p = after;
+        return true;
+    }
+
+    private static bool TryParseInt(string s, out int v)
+    {
+        if (s.StartsWith("0x") || s.StartsWith("0X"))
+            return int.TryParse(s[2..], NumberStyles.HexNumber, CultureInfo.InvariantCulture, out v);
+        if (s.StartsWith("$"))
+            return int.TryParse(s[1..], NumberStyles.HexNumber, CultureInfo.InvariantCulture, out v);
+        return int.TryParse(s, NumberStyles.Integer, CultureInfo.InvariantCulture, out v);
+    }
+}

src/ETTerms/Sessions/SerialChannel.cs

@@ -72,6 +72,22 @@ public sealed class SerialChannel : ISessionChannel
         if (_port.IsOpen) _port.Write(data, 0, data.Length);
     }
 
+    // ── TTL serial 控制指令用（sendbreak / setbaud / setdtr / setrts）──
+
+    /// <summary>送出 serial break（拉 break 狀態約 300ms）。</summary>
+    public void SendBreak()
+    {
+        if (!_port.IsOpen) return;
+        try { _port.BreakState = true; Thread.Sleep(300); }
+        finally { try { _port.BreakState = false; } catch { } }
+    }
+
+    /// <summary>執行中變更 baud rate（TTL setbaud）。</summary>
+    public void SetBaudRate(int baud) => _port.BaudRate = baud;
+
+    public void SetDtr(bool on) => _port.DtrEnable = on;
+    public void SetRts(bool on) => _port.RtsEnable = on;
+
     public void Resize(int cols, int rows) { /* serial 無 PTY size */ }
 
     public void Close()

src/ETTerms/Sessions/SessionPage.cs

@@ -63,6 +63,9 @@ public sealed class SessionPage : UserControl
     /// <summary>同步開啟失敗（主要是 Serial 連不上 / 被占用）時觸發，附帶訊息。</summary>
     public event Action<string>? ConnectFailed;
 
+    /// <summary>輸出中出現啟用的高亮關鍵字（UI thread），供 WorkspaceView 標分頁警示。</summary>
+    public event Action<string>? KeywordAlert;
+
     public SessionPage(ISessionChannel channel, string title)
     {
         _channel = channel;
@@ -90,12 +93,16 @@ public sealed class SessionPage : UserControl
         _term = new TerminalView(new TerminalProfile()) { Dock = DockStyle.Fill };
         _term.SendData += data => _channel.Write(data);
         _term.Resized += (cols, rows) => _channel.Resize(cols, rows);
+        _term.KeywordAlert += k => KeywordAlert?.Invoke(k);
 
         Controls.Add(_term);  // Fill 先加
         Controls.Add(bar);    // Top
 
         _runner.StatusChanged += (_, line, cmd) => Ui(() => _status.Text = $"line {line}: {Trunc(cmd)}");
         _runner.Finished += (_, msg) => Ui(() => { _status.Text = msg; SetRunning(false); });
+        // 腳本輸出（dispstr / [wait] 進度 / 錯誤）以灰色 echo 到終端機，執行過程看得見
+        _runner.Output += m => Ui(() =>
+            _term.Feed(System.Text.Encoding.UTF8.GetBytes($"\x1b[90m{m}\x1b[0m\r\n")));
     }
 
     private async void OnRunScript(object? sender, EventArgs e)

src/ETTerms/Terminal/ScreenBuffer.cs

@@ -62,6 +62,10 @@ public sealed class ScreenBuffer
     public int TotalRows => _sbCount + Rows;
     public Cell[] LineAt(int abs) => abs < _sbCount ? _sb[(_sbHead + abs) % _sb.Length]! : _screen[abs - _sbCount];
 
+    /// <summary>scrollback 滿後被丟棄的總行數。搜尋以「絕對行號 = DroppedLines + abs」錨定命中，
+    /// 舊行被丟棄時命中位置不會漂移。</summary>
+    public long DroppedLines { get; private set; }
+
     // ── 內部建構工具 ─────────────────────────────────────────
     private Cell BlankPen() => new() { Ch = ' ', Fg = PenFg, Bg = PenBg, Attr = CellAttr.None };
     private Cell BlankDefault() => new() { Ch = ' ', Fg = DefaultFg, Bg = DefaultBg, Attr = CellAttr.None };
@@ -78,7 +82,7 @@ public sealed class ScreenBuffer
     {
         if (_sb.Length == 0) return;
         if (_sbCount < _sb.Length) _sb[(_sbHead + _sbCount++) % _sb.Length] = line;
-        else { _sb[_sbHead] = line; _sbHead = (_sbHead + 1) % _sb.Length; }   // 滿了：覆蓋最舊一行
+        else { _sb[_sbHead] = line; _sbHead = (_sbHead + 1) % _sb.Length; DroppedLines++; }   // 滿了：覆蓋最舊一行
     }
 
     // ── 輸出字元 ─────────────────────────────────────────────
@@ -233,7 +237,7 @@ public sealed class ScreenBuffer
 
     public void EraseInDisplay(int mode)
     {
-        if (mode == 3) { Array.Clear(_sb); _sbHead = 0; _sbCount = 0; return; }
+        if (mode == 3) { DroppedLines += _sbCount; Array.Clear(_sb); _sbHead = 0; _sbCount = 0; return; }
         if (mode == 2) { for (int r = 0; r < Rows; r++) _screen[r] = BlankLine(); return; }
         if (mode == 0)
         {

src/ETTerms/Terminal/TerminalView.cs

@@ -1,7 +1,9 @@
 using System.Drawing;
 using System.Runtime.InteropServices;
 using System.Text;
+using System.Text.RegularExpressions;
 using System.Windows.Forms;
+using ETTerms.Infrastructure;
 
 namespace ETTerms.Terminal;
 
@@ -33,6 +35,31 @@ public sealed class TerminalView : UserControl
     private (int row, int col) _selStart, _selEnd;
     private bool _hasSel;
 
+    // ── 搜尋（Ctrl+F）──
+    private Panel? _searchPanel;
+    private TextBox _searchBox = null!;
+    private Label _searchCount = null!;
+    private readonly List<(long line, int col, int len)> _matches = new();   // line = DroppedLines + abs
+    private int _matchIdx = -1;
+
+    // ── 高亮標記（搜尋命中 + 關鍵字），每次 OnPaint 對可見行重建 ──
+    private enum MarkKind { Keyword, Search, SearchCurrent }
+    private readonly Dictionary<int, List<(int col, int len, MarkKind kind)>> _rowMarks = new();
+    private readonly StringBuilder _lineSb = new();
+    private readonly List<int> _lineColMap = new();
+
+    // ── 關鍵字警示（Feed 偵測，分頁標紅點用）──
+    private static readonly Regex AnsiStrip = new(
+        @"\x1B\][^\x07\x1B]*(\x07|\x1B\\)|\x1B[@-Z\\-_]|\x1B\[[0-?]*[ -/]*[@-~]",
+        RegexOptions.Compiled);
+    private readonly Decoder _alertDec = Encoding.UTF8.GetDecoder();
+    private string _alertCarry = "";
+    private readonly Dictionary<string, long> _alertLastFired = new(StringComparer.OrdinalIgnoreCase);
+    private const int AlertCooldownMs = 2000;
+
+    /// <summary>啟用的關鍵字在輸出中出現（UI thread 觸發），供分頁標警示。</summary>
+    public event Action<string>? KeywordAlert;
+
     public TerminalView(TerminalProfile profile)
     {
         SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint
@@ -63,6 +90,7 @@ public sealed class TerminalView : UserControl
     /// <summary>餵入遠端資料（須在 UI thread 呼叫）。</summary>
     public void Feed(byte[] data)
     {
+        DetectKeywords(data);
         int before = _buf.ScrollbackCount;
         _parser.Feed(data);
         // 已貼底才跟隨新輸出；使用者往回看歷史時，補償 scrollback 增量讓畫面停在原處，
@@ -88,6 +116,8 @@ public sealed class TerminalView : UserControl
         if (ClientSize.Width < _cellW || ClientSize.Height < _cellH) return;
         if (FindForm() is { WindowState: FormWindowState.Minimized }) return;
 
+        PositionSearchPanel();
+
         int cols = VisibleCols, rows = VisibleRows;
         if (cols == _lastCols && rows == _lastRows) return;
         _lastCols = cols; _lastRows = rows;
@@ -106,6 +136,8 @@ public sealed class TerminalView : UserControl
         int top = _buf.ScrollbackCount - _scrollOffset;   // 視窗第一列的絕對 index
         if (top < 0) top = 0;
 
+        CollectMarks(top, rows);
+
         for (int vr = 0; vr < rows; vr++)
         {
             int abs = top + vr;
@@ -179,6 +211,27 @@ public sealed class TerminalView : UserControl
         fg = cell.Fg.A == 0 ? _buf.DefaultFg : cell.Fg;
         bg = cell.Bg.A == 0 ? _buf.DefaultBg : cell.Bg;
         if ((cell.Attr & CellAttr.Inverse) != 0) (fg, bg) = (bg, fg);
+
+        // 標記優先序：目前搜尋命中 > 其他搜尋命中 > 關鍵字（選取反白最後蓋上）
+        if (_rowMarks.TryGetValue(abs, out var marks))
+        {
+            var best = MarkKind.Keyword; bool hit = false;
+            foreach (var (c0, len, kind) in marks)
+            {
+                if (col < c0 || col >= c0 + len) continue;
+                if (!hit || kind > best) { best = kind; hit = true; }
+            }
+            if (hit)
+            {
+                switch (best)
+                {
+                    case MarkKind.SearchCurrent: bg = Color.FromArgb(215, 160, 40); fg = Color.Black; break;
+                    case MarkKind.Search: bg = Color.FromArgb(120, 100, 25); break;
+                    case MarkKind.Keyword: bg = Color.FromArgb(150, 45, 45); break;
+                }
+            }
+        }
+
         if (_hasSel && InSelection(abs, col)) (fg, bg) = (bg, Color.FromArgb(70, 90, 140));
     }
 
@@ -199,6 +252,9 @@ public sealed class TerminalView : UserControl
     {
         if (e.Control && e.KeyCode == Keys.C && _hasSel) { CopySelection(); e.Handled = e.SuppressKeyPress = true; return; }
         if ((e.Control && e.KeyCode == Keys.V) || (e.Shift && e.KeyCode == Keys.Insert)) { Paste(); e.Handled = e.SuppressKeyPress = true; return; }
+        if (e.Control && e.KeyCode == Keys.F) { OpenSearch(); e.Handled = e.SuppressKeyPress = true; return; }
+        if (e.KeyCode == Keys.F3 && _searchPanel is { Visible: true }) { StepMatch(e.Shift ? +1 : -1); e.Handled = e.SuppressKeyPress = true; return; }
+        if (e.KeyCode == Keys.Escape && _searchPanel is { Visible: true }) { CloseSearch(); e.Handled = e.SuppressKeyPress = true; return; }
 
         var bytes = TerminalInput.Map(e, _parser.AppCursorKeys);
         if (bytes != null) { SendData?.Invoke(bytes); e.Handled = e.SuppressKeyPress = true; }
@@ -358,6 +414,243 @@ public sealed class TerminalView : UserControl
         catch { }
     }
 
+    // ── 搜尋（Ctrl+F）─────────────────────────────────────────
+    private void OpenSearch()
+    {
+        EnsureSearchUi();
+        _searchPanel!.Visible = true;
+        PositionSearchPanel();
+        _searchBox.SelectAll();
+        _searchBox.Focus();
+        if (_searchBox.Text.Length > 0) RunSearch();
+    }
+
+    private void CloseSearch()
+    {
+        if (_searchPanel == null) return;
+        _searchPanel.Visible = false;
+        _matches.Clear();
+        _matchIdx = -1;
+        Focus();
+        Invalidate();
+    }
+
+    private void EnsureSearchUi()
+    {
+        if (_searchPanel != null) return;
+
+        var back = Color.FromArgb(32, 32, 38);
+        _searchPanel = new Panel { Size = new Size(268, 30), BackColor = back, Visible = false };
+        _searchPanel.Paint += (_, pe) =>
+        {
+            using var pen = new Pen(Color.FromArgb(58, 58, 66));
+            pe.Graphics.DrawRectangle(pen, 0, 0, _searchPanel.Width - 1, _searchPanel.Height - 1);
+        };
+
+        _searchBox = new TextBox
+        {
+            Bounds = new Rectangle(6, 5, 130, 20), BorderStyle = BorderStyle.None,
+            BackColor = back, ForeColor = Color.FromArgb(222, 222, 226), Font = new Font("Segoe UI", 9.5f)
+        };
+        _searchBox.TextChanged += (_, _) => RunSearch();
+        _searchBox.KeyDown += (_, e) =>
+        {
+            if (e.KeyCode == Keys.Enter || e.KeyCode == Keys.F3)
+            { StepMatch(e.Shift ? +1 : -1); e.Handled = e.SuppressKeyPress = true; }   // Enter 往上找（較舊），Shift 往下
+            else if (e.KeyCode == Keys.Escape)
+            { CloseSearch(); e.Handled = e.SuppressKeyPress = true; }
+        };
+
+        _searchCount = new Label
+        {
+            Bounds = new Rectangle(138, 7, 56, 16), Text = "",
+            ForeColor = Color.FromArgb(150, 150, 158), BackColor = back,
+            Font = new Font("Segoe UI", 8.5f), TextAlign = ContentAlignment.MiddleRight
+        };
+
+        Button MakeBtn(string text, int x, Action onClick)
+        {
+            var b = new Button
+            {
+                Bounds = new Rectangle(x, 4, 22, 22), Text = text, FlatStyle = FlatStyle.Flat,
+                ForeColor = Color.FromArgb(180, 180, 188), BackColor = back,
+                Font = new Font("Segoe UI", 8.5f), TabStop = false, Cursor = Cursors.Hand
+            };
+            b.FlatAppearance.BorderSize = 0;
+            b.FlatAppearance.MouseOverBackColor = Color.FromArgb(60, 60, 70);
+            b.Click += (_, _) => { onClick(); _searchBox.Focus(); };
+            return b;
+        }
+        var up = MakeBtn("▲", 196, () => StepMatch(-1));     // 往上（較舊）
+        var down = MakeBtn("▼", 218, () => StepMatch(+1));   // 往下（較新）
+        var close = MakeBtn("✕", 240, CloseSearch);
+
+        _searchPanel.Controls.AddRange(new Control[] { _searchBox, _searchCount, up, down, close });
+        Controls.Add(_searchPanel);
+        _searchPanel.BringToFront();
+    }
+
+    private void PositionSearchPanel()
+    {
+        if (_searchPanel == null) return;
+        _searchPanel.Location = new Point(Math.Max(0, ContentWidth - _searchPanel.Width - 8), 6);
+    }
+
+    /// <summary>重掃整個 buffer（scrollback + 畫面）建立命中清單，並跳到最靠近底部的命中。</summary>
+    private void RunSearch()
+    {
+        _matches.Clear();
+        _matchIdx = -1;
+        string q = _searchBox.Text;
+        if (q.Length > 0)
+        {
+            long dropped = _buf.DroppedLines;
+            for (int abs = 0; abs < _buf.TotalRows; abs++)
+            {
+                BuildLineText(_buf.LineAt(abs), _lineSb, _lineColMap);
+                string s = _lineSb.ToString();
+                int at = 0;
+                while (s.Length >= q.Length && (at = s.IndexOf(q, at, StringComparison.OrdinalIgnoreCase)) >= 0)
+                {
+                    int colStart = _lineColMap[at];
+                    int colEnd = at + q.Length < _lineColMap.Count
+                        ? _lineColMap[at + q.Length]
+                        : _buf.LineAt(abs).Length;
+                    _matches.Add((dropped + abs, colStart, Math.Max(1, colEnd - colStart)));
+                    at++;
+                }
+            }
+            if (_matches.Count > 0) { _matchIdx = _matches.Count - 1; ScrollToMatch(); }
+        }
+        UpdateSearchCount();
+        Invalidate();
+    }
+
+    /// <summary>dir = -1 往上（較舊）、+1 往下（較新），循環。</summary>
+    private void StepMatch(int dir)
+    {
+        if (_matches.Count == 0) { RunSearch(); if (_matches.Count == 0) return; }
+        else
+        {
+            _matchIdx = (_matchIdx + dir + _matches.Count) % _matches.Count;
+            ScrollToMatch();
+        }
+        UpdateSearchCount();
+        Invalidate();
+    }
+
+    private void ScrollToMatch()
+    {
+        if (_matchIdx < 0 || _matchIdx >= _matches.Count) return;
+        int abs = (int)(_matches[_matchIdx].line - _buf.DroppedLines);
+        if (abs < 0) return;   // 該行已被 scrollback 丟棄
+        int top = Math.Max(0, abs - VisibleRows / 2);
+        _scrollOffset = Math.Clamp(_buf.ScrollbackCount - top, 0, _buf.ScrollbackCount);
+        UpdateScrollBar();
+    }
+
+    private void UpdateSearchCount() =>
+        _searchCount.Text = _matches.Count == 0
+            ? (_searchBox.Text.Length > 0 ? "0" : "")
+            : $"{_matchIdx + 1}/{_matches.Count}";
+
+    // ── 高亮標記收集（每次重繪對可見行執行）──────────────────
+    private void CollectMarks(int top, int rows)
+    {
+        _rowMarks.Clear();
+
+        // 關鍵字（Settings → Highlight）：只掃可見行，成本固定
+        var settings = AppSettings.Instance;
+        bool kwOn = settings.KeywordHighlightEnabled && settings.KeywordRules.Count > 0;
+
+        if (kwOn)
+        {
+            for (int vr = 0; vr < rows; vr++)
+            {
+                int abs = top + vr;
+                if (abs >= _buf.TotalRows) break;
+                BuildLineText(_buf.LineAt(abs), _lineSb, _lineColMap);
+                string s = _lineSb.ToString();
+                foreach (var rule in settings.KeywordRules)
+                {
+                    if (!rule.Enabled || rule.Text.Length == 0) continue;
+                    int at = 0;
+                    while (s.Length >= rule.Text.Length &&
+                           (at = s.IndexOf(rule.Text, at, StringComparison.OrdinalIgnoreCase)) >= 0)
+                    {
+                        int colStart = _lineColMap[at];
+                        int colEnd = at + rule.Text.Length < _lineColMap.Count
+                            ? _lineColMap[at + rule.Text.Length]
+                            : _buf.LineAt(abs).Length;
+                        AddMark(abs, colStart, Math.Max(1, colEnd - colStart), MarkKind.Keyword);
+                        at++;
+                    }
+                }
+            }
+        }
+
+        // 搜尋命中（RunSearch 已算好，換算回目前 abs）
+        if (_matches.Count > 0)
+        {
+            long dropped = _buf.DroppedLines;
+            for (int i = 0; i < _matches.Count; i++)
+            {
+                int abs = (int)(_matches[i].line - dropped);
+                if (abs < top || abs >= top + rows) continue;
+                AddMark(abs, _matches[i].col, _matches[i].len,
+                    i == _matchIdx ? MarkKind.SearchCurrent : MarkKind.Search);
+            }
+        }
+    }
+
+    private void AddMark(int abs, int col, int len, MarkKind kind)
+    {
+        if (!_rowMarks.TryGetValue(abs, out var list)) _rowMarks[abs] = list = new();
+        list.Add((col, len, kind));
+    }
+
+    /// <summary>把一行 cell 轉成緊湊字串（略過 WideTrail），並記錄字元 index → 欄位 col 的對應。</summary>
+    private static void BuildLineText(Cell[] line, StringBuilder sb, List<int> colMap)
+    {
+        sb.Clear();
+        colMap.Clear();
+        for (int c = 0; c < line.Length; c++)
+        {
+            var cell = line[c];
+            if ((cell.Attr & CellAttr.WideTrail) != 0) continue;
+            sb.Append(cell.Ch == '\0' ? ' ' : cell.Ch);
+            colMap.Add(c);
+        }
+    }
+
+    // ── 關鍵字警示（Feed 路徑偵測，供分頁標紅點）──────────────
+    private void DetectKeywords(byte[] data)
+    {
+        var settings = AppSettings.Instance;
+        if (!settings.KeywordHighlightEnabled || settings.KeywordRules.Count == 0 || KeywordAlert == null)
+        { _alertCarry = ""; return; }
+
+        var chars = new char[data.Length];
+        int n = _alertDec.GetChars(data, 0, data.Length, chars, 0);
+        if (n == 0) return;
+
+        string text = _alertCarry + AnsiStrip.Replace(new string(chars, 0, n), "");
+        int maxKw = 1;
+        foreach (var rule in settings.KeywordRules)
+        {
+            if (!rule.Enabled || rule.Text.Length == 0) continue;
+            maxKw = Math.Max(maxKw, rule.Text.Length);
+            if (text.IndexOf(rule.Text, StringComparison.OrdinalIgnoreCase) < 0) continue;
+            long now = Environment.TickCount64;
+            if (_alertLastFired.TryGetValue(rule.Text, out var last) && now - last < AlertCooldownMs) continue;
+            _alertLastFired[rule.Text] = now;
+            KeywordAlert.Invoke(rule.Text);
+        }
+        // 保留尾巴（最長關鍵字 - 1），跨 chunk 的關鍵字下一輪才接得上
+        int keep = maxKw - 1;
+        _alertCarry = text.Length <= keep ? text : text[^keep..];
+    }
+
     // ── IME（中文 / 日文 / 韓文輸入）─────────────────────────
     // 自繪控制項預設不處理 IME 組字，故攔截 WM_IME_COMPOSITION 取「結果字串」直接送出 UTF-8。
     private const int WM_IME_STARTCOMPOSITION = 0x010D;