Almost feature complete

- Added reading of UCL scripts
- Added pasteboard commands
- Added ui:command which will define a proc at the top-level

.gitignore

@@ -1 +1,3 @@
 debug.log
+.DS_store
+.idea

cmd/dynamo-browse/main.go

@@ -4,9 +4,11 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"github.com/lmika/dynamo-browse/internal/common/ui/commandctrl/cmdpacks"
 	"log"
 	"net"
 	"os"
+	"strings"
 
 	"github.com/aws/aws-sdk-go-v2/config"
 	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
@@ -44,6 +46,7 @@ func main() {
 	var flagDefaultLimit = flag.Int("default-limit", 0, "default limit for queries and scans")
 	var flagWorkspace = flag.String("w", "", "workspace file")
 	var flagQuery = flag.String("q", "", "run query")
+	var flagExtDir = flag.String("ext-dir", "$HOME/.config/dynamo-browse/ext:$HOME/.config/dynamo-browse/.", "directory to search for extensions")
 	flag.Parse()
 
 	ctx := context.Background()
@@ -127,7 +130,7 @@ func main() {
 	exportController := controllers.NewExportController(state, tableService, jobsController, columnsController, pasteboardProvider)
 	settingsController := controllers.NewSettingsController(settingStore, eventBus)
 	keyBindings := keybindings.Default()
-	scriptController := controllers.NewScriptController(scriptManagerService, tableReadController, jobsController, settingsController, eventBus)
+	//scriptController := controllers.NewScriptController(scriptManagerService, tableReadController, jobsController, settingsController, eventBus)
 
 	if *flagQuery != "" {
 		if *flagTable == "" {
@@ -157,10 +160,20 @@ func main() {
 	}
 
 	keyBindingService := keybindings_service.NewService(keyBindings)
-	keyBindingController := controllers.NewKeyBindingController(keyBindingService, scriptController)
+	keyBindingController := controllers.NewKeyBindingController(keyBindingService, nil)
 
-	commandController := commandctrl.NewCommandController(inputHistoryService)
+	stdCommands := cmdpacks.NewStandardCommands(
-	commandController.AddCommandLookupExtension(scriptController)
+		tableService,
+		state,
+		tableReadController,
+		tableWriteController,
+		exportController,
+		keyBindingController,
+		pasteboardProvider,
+	)
+
+	commandController := commandctrl.NewCommandController(inputHistoryService, stdCommands)
+	//commandController.AddCommandLookupExtension(scriptController)
 	commandController.SetCommandCompletionProvider(columnsController)
 
 	model := ui.NewModel(
@@ -172,12 +185,13 @@ func main() {
 		jobsController,
 		itemRendererService,
 		commandController,
-		scriptController,
+		//scriptController,
 		eventBus,
 		keyBindingController,
 		pasteboardProvider,
 		keyBindings,
 	)
+	commandController.SetUIStateProvider(&model)
 
 	// Pre-determine if layout has dark background.  This prevents calls for creating a list to hang.
 	osstyle.DetectCurrentScheme()
@@ -185,9 +199,14 @@ func main() {
 	p := tea.NewProgram(model, tea.WithAltScreen())
 
 	jobsController.SetMessageSender(p.Send)
-	scriptController.Init()
+	//scriptController.Init()
-	scriptController.SetMessageSender(p.Send)
+	//scriptController.SetMessageSender(p.Send)
-	commandController.SetMessageSender(p.Send)
+
+	if err := commandController.LoadExtensions(context.Background(), strings.Split(*flagExtDir, string(os.PathListSeparator))); err != nil {
+		fmt.Printf("Unable to load extensions: %v", err)
+	}
+
+	go commandController.StartMessageSender(p.Send)
 
 	log.Println("launching")
 	if err := p.Start(); err != nil {

go.mod

@@ -1,8 +1,8 @@
 module github.com/lmika/dynamo-browse
 
-go 1.22
+go 1.24
 
-toolchain go1.22.0
+toolchain go1.24.0
 
 require (
 	github.com/alecthomas/participle/v2 v2.1.1
@@ -117,5 +117,5 @@ require (
 	golang.org/x/text v0.9.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	ucl.lmika.dev v0.0.0-20240501110514-25594c80d273 // indirect
+	ucl.lmika.dev v0.0.0-20250525023717-3076897eb73e // indirect
 )

go.sum

@@ -5,6 +5,8 @@ github.com/DataDog/zstd v1.5.2/go.mod h1:g4AWEaM3yOg3HYfnJ3YIawPnVdXJh9QME85blwS
 github.com/Sereal/Sereal v0.0.0-20220220040404-e0d1e550e879 h1:M5ptEKnqKqpFTKbe+p5zEf3ro1deJ6opUz5j3g3/ErQ=
 github.com/Sereal/Sereal v0.0.0-20220220040404-e0d1e550e879/go.mod h1:D0JMgToj/WdxCgd30Kc1UcA9E+WdZoJqeVOuYW7iTBM=
 github.com/alecthomas/assert/v2 v2.0.3 h1:WKqJODfOiQG0nEJKFKzDIG3E29CN2/4zR9XGJzKIkbg=
+github.com/alecthomas/participle v0.7.1 h1:2bN7reTw//5f0cugJcTOnY/NYZcWQOaajW+BwZB5xWs=
+github.com/alecthomas/participle v0.7.1/go.mod h1:HfdmEuwvr12HXQN44HPWXR0lHmVolVYe4dyL6lQ3duY=
 github.com/alecthomas/participle/v2 v2.0.0-beta.5 h1:y6dsSYVb1G5eK6mgmy+BgI3Mw35a3WghArZ/Hbebrjo=
 github.com/alecthomas/participle/v2 v2.0.0-beta.5/go.mod h1:RC764t6n4L8D8ITAJv0qdokritYSNR3wV5cVwmIEaMM=
 github.com/alecthomas/participle/v2 v2.1.1 h1:hrjKESvSqGHzRb4yW1ciisFJ4p3MGYih6icjJvbsmV8=
@@ -430,3 +432,33 @@ ucl.lmika.dev v0.0.0-20240427010304-6315afc54287 h1:llPHrjca54duvQx9PgMTFDhOW2VQ
 ucl.lmika.dev v0.0.0-20240427010304-6315afc54287/go.mod h1:T6V4jIUxlWvMTgn4J752VDHNA8iyVrEX6v98EvDj8G4=
 ucl.lmika.dev v0.0.0-20240501110514-25594c80d273 h1:+JpKw02VTAcOjJw7Q6juun/9hk9ypNSdTRlf+E4M5Nw=
 ucl.lmika.dev v0.0.0-20240501110514-25594c80d273/go.mod h1:T6V4jIUxlWvMTgn4J752VDHNA8iyVrEX6v98EvDj8G4=
+ucl.lmika.dev v0.0.0-20240504001444-cf3a12bf0d4d h1:OqGmR0Y+OG6aFIOlXy2QwEHtuUNasYCh/6cxHokYQj4=
+ucl.lmika.dev v0.0.0-20240504001444-cf3a12bf0d4d/go.mod h1:T6V4jIUxlWvMTgn4J752VDHNA8iyVrEX6v98EvDj8G4=
+ucl.lmika.dev v0.0.0-20240504013531-0dc9fd3c3281 h1:/M7phiv/0XVp3wKkOxEnGQysf8+RS6NOaBQZyUEoSsA=
+ucl.lmika.dev v0.0.0-20240504013531-0dc9fd3c3281/go.mod h1:T6V4jIUxlWvMTgn4J752VDHNA8iyVrEX6v98EvDj8G4=
+ucl.lmika.dev v0.0.0-20250306030053-ad6d002a22e8 h1:vWttdW8GJWcTUQeJFbQHqCHJDLFWQ9nccUTx/lW2v8s=
+ucl.lmika.dev v0.0.0-20250306030053-ad6d002a22e8/go.mod h1:FMP2ncSu4UxfvB0iA2zlebwL+1UPCARdyYNOrmi86A4=
+ucl.lmika.dev v0.0.0-20250515115457-27b6cc0b92e2 h1:cvguOoQ0HVgLKbHH17ZHvAUFht6HXApLi0o8JOdaaNU=
+ucl.lmika.dev v0.0.0-20250515115457-27b6cc0b92e2/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250517003439-109be33d1495 h1:r46r+7T59Drm+in7TEWKCZfFYIM0ZyZ26QjHAbj8Lto=
+ucl.lmika.dev v0.0.0-20250517003439-109be33d1495/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250517115116-0f1ceba0902e h1:CQ+qPqI5lYiiEM0tNAr4jS0iMz16bFqOui5mU3AHsCU=
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+ucl.lmika.dev v0.0.0-20250517212052-51e35aa9a675 h1:kGKh3zj6lMzOrGAquFW7ROgx9/6nwJ8DXiSLtceRiak=
+ucl.lmika.dev v0.0.0-20250517212052-51e35aa9a675/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250517212757-33d04ba18db4 h1:rnietWu2B+NXLqKfo7jgf6r+srMwxFa5eizywkq4LFk=
+ucl.lmika.dev v0.0.0-20250517212757-33d04ba18db4/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250517213937-94aad417121d h1:CMcA8aQV6iiPK75EbHvoIVZhZmSggfrWNhK9BFm2aIg=
+ucl.lmika.dev v0.0.0-20250517213937-94aad417121d/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250518024533-f4be44fcbc94 h1:x3IRtT1jbedblimi2hesKGBihg243+wNOSvagCPR0KU=
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+ucl.lmika.dev v0.0.0-20250518033831-f79e91e26d78 h1:lbOZUb6whYMLI4win5QL+eLSgqc3N9TtTgT8hTipNl8=
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+ucl.lmika.dev v0.0.0-20250519111943-1173d163f5e3 h1:ZMQ1rkcAWa///c3bVvlXbtuqjfAWxDm01abQl3g/YVw=
+ucl.lmika.dev v0.0.0-20250519111943-1173d163f5e3/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250519114239-7ca821016e9a h1:dzBBFCY50+MQcJaQ90swdDyjzag5oIhwdfqbmZkvX3Q=
+ucl.lmika.dev v0.0.0-20250519114239-7ca821016e9a/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250519120409-53b05b5ba6f8 h1:h32JQi0d1MI86RaAMaEU7kvti4uSLX5XYe/nk2abApg=
+ucl.lmika.dev v0.0.0-20250519120409-53b05b5ba6f8/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=
+ucl.lmika.dev v0.0.0-20250525023717-3076897eb73e h1:N+HzQUunDUvdjAzbSDtHQZVZ1k+XHbVgbNwmc+EKmlQ=
+ucl.lmika.dev v0.0.0-20250525023717-3076897eb73e/go.mod h1:/MMZKm6mOMtnY4I8TYEot4Pc8dKEy+/IAQo1VdpA5EY=

internal/common/ui/commandctrl/cmdpacks/modpb.go

@@ -0,0 +1,46 @@
+package cmdpacks
+
+import (
+	"context"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/providers/pasteboardprovider"
+	"ucl.lmika.dev/ucl"
+)
+
+type pbModule struct {
+	pasteboardProvider *pasteboardprovider.Provider
+}
+
+func (m pbModule) pbGet(ctx context.Context, args ucl.CallArgs) (any, error) {
+	s, ok := m.pasteboardProvider.ReadText()
+	if !ok {
+		return "", nil
+	}
+	return s, nil
+}
+
+func (m pbModule) pbPut(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var s string
+	if err := args.Bind(&s); err != nil {
+		return nil, err
+	}
+	if err := m.pasteboardProvider.WriteText([]byte(s)); err != nil {
+		return nil, err
+	}
+	return s, nil
+}
+
+func modulePB(
+	pasteboardProvider *pasteboardprovider.Provider,
+) ucl.Module {
+	m := &pbModule{
+		pasteboardProvider: pasteboardProvider,
+	}
+
+	return ucl.Module{
+		Name: "pb",
+		Builtins: map[string]ucl.BuiltinHandler{
+			"get": m.pbGet,
+			"put": m.pbPut,
+		},
+	}
+}

internal/common/ui/commandctrl/cmdpacks/modrs.go

@@ -0,0 +1,308 @@
+package cmdpacks
+
+import (
+	"context"
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
+	"github.com/lmika/dynamo-browse/internal/common/ui/commandctrl"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/controllers"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/models"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/models/queryexpr"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services/tables"
+	"github.com/pkg/errors"
+	"time"
+	"ucl.lmika.dev/repl"
+	"ucl.lmika.dev/ucl"
+)
+
+type rsModule struct {
+	tableService *tables.Service
+	state        *controllers.State
+}
+
+var rsNewDoc = repl.Doc{
+	Brief: "Creates a new, empty result set",
+	Usage: "[-table NAME]",
+	Detailed: `
+		The result set assumes the details of the current table. If no table is specified,
+		the command will return an error.
+	`,
+}
+
+func (rs *rsModule) rsNew(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	var tableInfo *models.TableInfo
+	if args.HasSwitch("table") {
+		var tblName string
+		if err := args.BindSwitch("table", &tblName); err != nil {
+			return nil, err
+		}
+
+		tableInfo, err = rs.tableService.Describe(ctx, tblName)
+		if err != nil {
+			return nil, err
+		}
+	} else if currRs := rs.state.ResultSet(); currRs != nil && currRs.TableInfo != nil {
+		tableInfo = currRs.TableInfo
+	} else {
+		return nil, errors.New("no table specified")
+	}
+
+	return newResultSetProxy(&models.ResultSet{
+		TableInfo: tableInfo,
+		Created:   time.Now(),
+	}), nil
+}
+
+var rsQueryDoc = repl.Doc{
+	Brief: "Runs a query and returns the results as a result-set",
+	Usage: "QUERY [ARGS] [-table NAME]",
+	Args: []repl.ArgDoc{
+		{Name: "query", Brief: "Query expression to run"},
+		{Name: "args", Brief: "Hash of argument values to substitute into the query"},
+		{Name: "-table", Brief: "Optional table name to use for the query"},
+	},
+	Detailed: `
+		If no table is specified, then the value of @table will be used. If this is unavailable,
+		the command will return an error.
+    `,
+}
+
+func parseQuery(
+	ctx context.Context,
+	args ucl.CallArgs,
+	currentRS *models.ResultSet,
+	tablesService *tables.Service,
+) (*queryexpr.QueryExpr, *models.TableInfo, error) {
+	var expr string
+	if err := args.Bind(&expr); err != nil {
+		return nil, nil, err
+	}
+
+	q, err := queryexpr.Parse(expr)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if args.NArgs() > 0 {
+		var queryArgs ucl.Hashable
+		if err := args.Bind(&queryArgs); err != nil {
+			return nil, nil, err
+		}
+
+		queryNames := map[string]string{}
+		queryValues := map[string]types.AttributeValue{}
+		queryArgs.Each(func(k string, v ucl.Object) error {
+			if v == nil {
+				return nil
+			}
+
+			queryNames[k] = v.String()
+
+			switch v.(type) {
+			case ucl.StringObject:
+				queryValues[k] = &types.AttributeValueMemberS{Value: v.String()}
+			case ucl.IntObject:
+				queryValues[k] = &types.AttributeValueMemberN{Value: v.String()}
+				// TODO: other types
+			}
+			return nil
+		})
+
+		q = q.WithNameParams(queryNames).WithValueParams(queryValues)
+	}
+
+	var tableInfo *models.TableInfo
+	if args.HasSwitch("table") {
+		var tblName string
+		if err := args.BindSwitch("table", &tblName); err != nil {
+			return nil, nil, err
+		}
+
+		tableInfo, err = tablesService.Describe(ctx, tblName)
+		if err != nil {
+			return nil, nil, err
+		}
+	} else if currentRS != nil && currentRS.TableInfo != nil {
+		tableInfo = currentRS.TableInfo
+	} else {
+		return nil, nil, errors.New("no table specified")
+	}
+
+	return q, tableInfo, nil
+}
+
+func (rs *rsModule) rsQuery(ctx context.Context, args ucl.CallArgs) (any, error) {
+	q, tableInfo, err := parseQuery(ctx, args, rs.state.ResultSet(), rs.tableService)
+	if err != nil {
+		return nil, err
+	}
+
+	newResultSet, err := rs.tableService.ScanOrQuery(context.Background(), tableInfo, q, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return newResultSetProxy(newResultSet), nil
+}
+
+var rsScanDoc = repl.Doc{
+	Brief: "Performs a scan of the table and returns the results as a result-set",
+	Usage: "[-table NAME]",
+	Args: []repl.ArgDoc{
+		{Name: "-table", Brief: "Optional table name to use for the query"},
+	},
+	Detailed: `
+		If no table is specified, then the value of @table will be used. If this is unavailable,
+		the command will return an error.
+    `,
+}
+
+func (rs *rsModule) rsScan(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	var tableInfo *models.TableInfo
+	if args.HasSwitch("table") {
+		var tblName string
+		if err := args.BindSwitch("table", &tblName); err != nil {
+			return nil, err
+		}
+
+		tableInfo, err = rs.tableService.Describe(ctx, tblName)
+		if err != nil {
+			return nil, err
+		}
+	} else if currRs := rs.state.ResultSet(); currRs != nil && currRs.TableInfo != nil {
+		tableInfo = currRs.TableInfo
+	} else {
+		return nil, errors.New("no table specified")
+	}
+
+	newResultSet, err := rs.tableService.Scan(context.Background(), tableInfo)
+	if err != nil {
+		return nil, err
+	}
+
+	return newResultSetProxy(newResultSet), nil
+}
+
+func (rs *rsModule) rsFilter(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var (
+		rsProxy SimpleProxy[*models.ResultSet]
+		filter  string
+	)
+
+	if err := args.Bind(&rsProxy, &filter); err != nil {
+		return nil, err
+	}
+
+	newResultSet := rs.tableService.Filter(rsProxy.ProxyValue(), filter)
+	return newResultSetProxy(newResultSet), nil
+}
+
+var rsNextPageDoc = repl.Doc{
+	Brief: "Returns the next page of the passed in result-set",
+	Usage: "RESULT_SET",
+	Args: []repl.ArgDoc{
+		{Name: "result-set", Brief: "Result set to fetch the next page of"},
+	},
+	Detailed: `
+		If no next page exists, the command will return nil.
+	`,
+}
+
+func (rs *rsModule) rsNextPage(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	var rsProxy SimpleProxy[*models.ResultSet]
+
+	if err := args.Bind(&rsProxy); err != nil {
+		return nil, err
+	}
+
+	if !rsProxy.value.HasNextPage() {
+		return nil, nil
+	}
+
+	nextPage, err := rs.tableService.NextPage(ctx, rsProxy.value)
+	if err != nil {
+		return nil, err
+	}
+
+	return newResultSetProxy(nextPage), nil
+}
+
+func (rs *rsModule) rsUnion(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	var rsProxy1, rsProxy2 SimpleProxy[*models.ResultSet]
+
+	if err := args.Bind(&rsProxy1, &rsProxy2); err != nil {
+		return nil, err
+	}
+
+	return newResultSetProxy(rsProxy1.ProxyValue().MergeWith(rsProxy2.ProxyValue())), nil
+}
+
+func (rs *rsModule) rsSet(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	var (
+		item itemProxy
+		expr string
+		val  ucl.Object
+	)
+
+	if err := args.Bind(&item, &expr, &val); err != nil {
+		return nil, err
+	}
+
+	q, err := queryexpr.Parse(expr)
+	if err != nil {
+		return nil, err
+	}
+
+	// TEMP: attribute is always S
+	if err := q.SetEvalItem(item.item, &types.AttributeValueMemberS{Value: val.String()}); err != nil {
+		return nil, err
+	}
+	item.resultSet.SetDirty(item.idx, true)
+	commandctrl.QueueRefresh(ctx)
+
+	return item, nil
+}
+
+func (rs *rsModule) rsDel(ctx context.Context, args ucl.CallArgs) (_ any, err error) {
+	var (
+		item itemProxy
+		expr string
+	)
+
+	if err := args.Bind(&item, &expr); err != nil {
+		return nil, err
+	}
+
+	q, err := queryexpr.Parse(expr)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := q.DeleteAttribute(item.item); err != nil {
+		return nil, err
+	}
+	item.resultSet.SetDirty(item.idx, true)
+	commandctrl.QueueRefresh(ctx)
+
+	return item, nil
+}
+
+func moduleRS(tableService *tables.Service, state *controllers.State) ucl.Module {
+	m := &rsModule{
+		tableService: tableService,
+		state:        state,
+	}
+
+	return ucl.Module{
+		Name: "rs",
+		Builtins: map[string]ucl.BuiltinHandler{
+			"new":       m.rsNew,
+			"query":     m.rsQuery,
+			"scan":      m.rsScan,
+			"filter":    m.rsFilter,
+			"next-page": m.rsNextPage,
+			"union":     m.rsUnion,
+			"set":       m.rsSet,
+			"del":       m.rsDel,
+		},
+	}
+}

internal/common/ui/commandctrl/cmdpacks/modrs_test.go

@@ -0,0 +1,154 @@
+package cmdpacks_test
+
+import (
+	"fmt"
+	"github.com/lmika/dynamo-browse/internal/common/ui/commandctrl/cmdpacks"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/models"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestModRS_New(t *testing.T) {
+	svc := newService(t)
+
+	rsProxy, err := svc.CommandController.ExecuteAndWait(t.Context(), `rs:new`)
+
+	assert.NoError(t, err)
+	assert.IsType(t, rsProxy, cmdpacks.SimpleProxy[*models.ResultSet]{})
+}
+
+func TestModRS_NextPage(t *testing.T) {
+	t.Run("multiple pages", func(t *testing.T) {
+		svc := newService(t, withDataGenerator(largeTestData), withTable("large-table"), withDefaultLimit(20))
+
+		hasNextPage, err := svc.CommandController.ExecuteAndWait(t.Context(), `@resultset.HasNextPage`)
+		assert.NoError(t, err)
+		assert.True(t, hasNextPage.(bool))
+
+		// Page 2
+		rsProxy, err := svc.CommandController.ExecuteAndWait(t.Context(), `rs:next-page @resultset`)
+
+		assert.NoError(t, err)
+		assert.IsType(t, cmdpacks.SimpleProxy[*models.ResultSet]{}, rsProxy)
+		assert.Equal(t, 20, len(rsProxy.(cmdpacks.SimpleProxy[*models.ResultSet]).ProxyValue().Items()))
+
+		hasNextPage, err = svc.CommandController.ExecuteAndWait(t.Context(), `(rs:next-page @resultset).HasNextPage`)
+		assert.NoError(t, err)
+		assert.True(t, hasNextPage.(bool))
+
+		// Page 3
+		rsProxy, err = svc.CommandController.ExecuteAndWait(t.Context(), `rs:next-page @resultset | rs:next-page`)
+
+		assert.NoError(t, err)
+		assert.IsType(t, cmdpacks.SimpleProxy[*models.ResultSet]{}, rsProxy)
+		assert.Equal(t, 10, len(rsProxy.(cmdpacks.SimpleProxy[*models.ResultSet]).ProxyValue().Items()))
+
+		hasNextPage, err = svc.CommandController.ExecuteAndWait(t.Context(), `(rs:next-page @resultset | rs:next-page).HasNextPage`)
+		assert.NoError(t, err)
+		assert.False(t, hasNextPage.(bool))
+
+		// Last page
+		rsProxy, err = svc.CommandController.ExecuteAndWait(t.Context(), `rs:next-page (rs:next-page @resultset | rs:next-page)`)
+		assert.NoError(t, err)
+		assert.Nil(t, rsProxy)
+	})
+
+	t.Run("only one page", func(t *testing.T) {
+		svc := newService(t)
+
+		hasNextPage, err := svc.CommandController.ExecuteAndWait(t.Context(), `@resultset.HasNextPage`)
+		assert.NoError(t, err)
+		assert.False(t, hasNextPage.(bool))
+
+		rsProxy, err := svc.CommandController.ExecuteAndWait(t.Context(), `rs:next-page @resultset`)
+		assert.NoError(t, err)
+		assert.Nil(t, rsProxy)
+	})
+}
+
+func TestModRS_Union(t *testing.T) {
+	svc := newService(t, withDefaultLimit(2))
+
+	rsProxy, err := svc.CommandController.ExecuteAndWait(t.Context(), `
+		$mr = rs:union @resultset (rs:next-page @resultset)
+		
+		assert (eq (len $mr.Items) 3) "expected len == 3"
+		assert (eq $mr.Items.(0).pk "abc") "expected 0.pk"
+		assert (eq $mr.Items.(0).sk "111") "expected 0.sk"
+		assert (eq $mr.Items.(1).pk "abc") "expected 1.pk"
+		assert (eq $mr.Items.(1).sk "222") "expected 1.sk"
+		assert (eq $mr.Items.(2).pk "bbb") "expected 2.pk"
+		assert (eq $mr.Items.(2).sk "131") "expected 2.sk"
+
+		$mr
+	`)
+
+	assert.NoError(t, err)
+	assert.IsType(t, cmdpacks.SimpleProxy[*models.ResultSet]{}, rsProxy)
+
+	rs := rsProxy.(cmdpacks.SimpleProxy[*models.ResultSet]).ProxyValue()
+	assert.Equal(t, 3, len(rs.Items()))
+}
+
+func TestModRS_Query(t *testing.T) {
+	tests := []struct {
+		descr    string
+		cmd      string
+		wantRows []int
+	}{
+		{
+			descr:    "query with pk 1",
+			cmd:      `rs:query 'pk="abc"' -table service-test-data`,
+			wantRows: []int{0, 1},
+		},
+		{
+			descr:    "query with pk 2",
+			cmd:      `rs:query 'pk="bbb"' -table service-test-data`,
+			wantRows: []int{2},
+		},
+		{
+			descr:    "query with sk 1",
+			cmd:      `rs:query 'sk="222"' -table service-test-data`,
+			wantRows: []int{1},
+		},
+		{
+			descr:    "query with args 1",
+			cmd:      `rs:query 'pk=$v' [v:'abc'] -table service-test-data`,
+			wantRows: []int{0, 1},
+		},
+		{
+			descr:    "query with args 2",
+			cmd:      `rs:query ':k=$v' [k:'pk' v:'abc'] -table service-test-data`,
+			wantRows: []int{0, 1},
+		},
+		{
+			descr:    "query with args 3",
+			cmd:      `rs:query ':k=$v' [k:'beta' v:1231] -table service-test-data`,
+			wantRows: []int{1},
+		},
+		{
+			descr:    "query with args with no table set",
+			cmd:      `rs:query ':k=$v' [k:'beta' v:1231]`,
+			wantRows: []int{1},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.descr, func(t *testing.T) {
+			svc := newService(t)
+
+			res, err := svc.CommandController.ExecuteAndWait(t.Context(), tt.cmd)
+			assert.NoError(t, err)
+
+			rs := res.(cmdpacks.SimpleProxy[*models.ResultSet]).ProxyValue()
+			assert.Len(t, rs.Items(), len(tt.wantRows))
+
+			for i, rowIndex := range tt.wantRows {
+				for key, want := range svc.testData[0].Data[rowIndex] {
+					have, ok := rs.Items()[i].AttributeValueAsString(key)
+					assert.True(t, ok)
+					assert.Equal(t, fmt.Sprint(want), have)
+				}
+			}
+		})
+	}
+}

internal/common/ui/commandctrl/cmdpacks/modui.go

@@ -0,0 +1,210 @@
+package cmdpacks
+
+import (
+	"context"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/lmika/dynamo-browse/internal/common/ui/commandctrl"
+	"github.com/lmika/dynamo-browse/internal/common/ui/events"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/controllers"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services/tables"
+	"ucl.lmika.dev/ucl"
+)
+
+type uiModule struct {
+	tableService   *tables.Service
+	state          *controllers.State
+	ckb            *customKeyBinding
+	readController *controllers.TableReadController
+}
+
+func (m *uiModule) uiCommand(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var (
+		name string
+		cmd  ucl.Invokable
+	)
+	if err := args.Bind(&name, &cmd); err != nil {
+		return nil, err
+	}
+
+	invoker := commandctrl.GetInvoker(ctx)
+	invoker.Inst().SetBuiltinInvokable(name, cmd)
+	return nil, nil
+}
+
+func (m *uiModule) uiPrompt(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var prompt string
+	if err := args.Bind(&prompt); err != nil {
+		return nil, err
+	}
+
+	resChan := make(chan string)
+	go func() {
+		commandctrl.PostMsg(ctx, events.PromptForInput(prompt, nil, func(value string) tea.Msg {
+			resChan <- value
+			return nil
+		}))
+	}()
+
+	select {
+	case value := <-resChan:
+		return value, nil
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	}
+}
+
+func (m *uiModule) uiConfirm(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var prompt string
+	if err := args.Bind(&prompt); err != nil {
+		return nil, err
+	}
+
+	resChan := make(chan bool)
+	go func() {
+		commandctrl.PostMsg(ctx, events.Confirm(prompt, func(value bool) tea.Msg {
+			resChan <- value
+			return nil
+		}))
+	}()
+
+	select {
+	case value := <-resChan:
+		return value, nil
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	}
+}
+
+func (m *uiModule) uiPromptTable(ctx context.Context, args ucl.CallArgs) (any, error) {
+	tables, err := m.tableService.ListTables(context.Background())
+	if err != nil {
+		return nil, err
+	}
+
+	resChan := make(chan string)
+	go func() {
+		commandctrl.PostMsg(ctx, controllers.PromptForTableMsg{
+			Tables: tables,
+			OnSelected: func(tableName string) tea.Msg {
+				resChan <- tableName
+				return nil
+			},
+		})
+	}()
+
+	select {
+	case value := <-resChan:
+		return value, nil
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	}
+}
+
+func (m *uiModule) uiBind(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var (
+		bindName string
+		key      string
+		inv      ucl.Invokable
+	)
+
+	if args.NArgs() == 2 {
+		if err := args.Bind(&key, &inv); err != nil {
+			return nil, err
+		}
+		bindName = "custom." + key
+	} else {
+		if err := args.Bind(&bindName, &key, &inv); err != nil {
+			return nil, err
+		}
+	}
+
+	invoker := commandctrl.GetInvoker(ctx)
+
+	m.ckb.bindings[bindName] = func() tea.Msg {
+		return invoker.Invoke(inv, nil)
+	}
+	m.ckb.keyBindings[key] = bindName
+	return nil, nil
+}
+
+func (m *uiModule) uiQuery(ctx context.Context, args ucl.CallArgs) (any, error) {
+	q, tableInfo, err := parseQuery(ctx, args, m.state.ResultSet(), m.tableService)
+	if err != nil {
+		return nil, err
+	}
+
+	commandctrl.PostMsg(ctx, m.readController.RunQuery(q, tableInfo))
+	return nil, nil
+}
+
+func (m *uiModule) uiFilter(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var filter string
+
+	if err := args.Bind(&filter); err != nil {
+		return nil, err
+	}
+
+	commandctrl.PostMsg(ctx, m.readController.Filter(filter))
+	return nil, nil
+}
+
+func moduleUI(
+	tableService *tables.Service,
+	state *controllers.State,
+	readController *controllers.TableReadController,
+) (ucl.Module, controllers.CustomKeyBindingSource) {
+	m := &uiModule{
+		tableService:   tableService,
+		state:          state,
+		readController: readController,
+		ckb: &customKeyBinding{
+			bindings:    map[string]tea.Cmd{},
+			keyBindings: map[string]string{},
+		},
+	}
+
+	return ucl.Module{
+		Name: "ui",
+		Builtins: map[string]ucl.BuiltinHandler{
+			"command":      m.uiCommand,
+			"prompt":       m.uiPrompt,
+			"prompt-table": m.uiPromptTable,
+			"confirm":      m.uiConfirm,
+			"query":        m.uiQuery,
+			"filter":       m.uiFilter,
+			"bind":         m.uiBind,
+		},
+	}, m.ckb
+}
+
+type customKeyBinding struct {
+	bindings    map[string]tea.Cmd
+	keyBindings map[string]string
+}
+
+func (c *customKeyBinding) LookupBinding(theKey string) string {
+	return c.keyBindings[theKey]
+}
+
+func (c *customKeyBinding) CustomKeyCommand(key string) tea.Cmd {
+	bindingName, ok := c.keyBindings[key]
+	if !ok {
+		return nil
+	}
+
+	binding, ok := c.bindings[bindingName]
+	if !ok {
+		return nil
+	}
+
+	return binding
+}
+
+func (c *customKeyBinding) UnbindKey(key string) {
+	delete(c.keyBindings, key)
+}
+
+func (c *customKeyBinding) Rebind(bindingName string, newKey string) error {
+	c.keyBindings[newKey] = bindingName
+	return nil
+}

internal/common/ui/commandctrl/cmdpacks/proxy.go

@@ -0,0 +1,216 @@
+package cmdpacks
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/models"
+	"maps"
+	"strconv"
+	"ucl.lmika.dev/ucl"
+)
+
+type proxyInfo[T comparable] struct {
+	fields  map[string]func(t T) ucl.Object
+	lenFunc func(t T) int
+	strFunc func(t T) string
+}
+
+type SimpleProxy[T comparable] struct {
+	value     T
+	proxyInfo *proxyInfo[T]
+}
+
+func (tp SimpleProxy[T]) ProxyValue() T {
+	return tp.value
+}
+
+func (tp SimpleProxy[T]) String() string {
+	if tp.proxyInfo.strFunc != nil {
+		return tp.proxyInfo.strFunc(tp.value)
+	}
+	return fmt.Sprint(tp.value)
+}
+
+func (tp SimpleProxy[T]) Truthy() bool {
+	var zeroT T
+	return tp.value != zeroT
+}
+
+func (tp SimpleProxy[T]) Len() int {
+	if tp.proxyInfo.lenFunc != nil {
+		return tp.proxyInfo.lenFunc(tp.value)
+	}
+	return len(tp.proxyInfo.fields)
+}
+
+func (tp SimpleProxy[T]) Value(k string) ucl.Object {
+	f, ok := tp.proxyInfo.fields[k]
+	if !ok {
+		return nil
+	}
+	return f(tp.value)
+}
+
+func (tp SimpleProxy[T]) Each(fn func(k string, v ucl.Object) error) error {
+	for key := range maps.Keys(tp.proxyInfo.fields) {
+		if err := fn(key, tp.Value(key)); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+type simpleProxyList[T comparable] struct {
+	values    []T
+	converter func(T) ucl.Object
+}
+
+func newSimpleProxyList[T comparable](values []T, converter func(T) ucl.Object) simpleProxyList[T] {
+	return simpleProxyList[T]{values: values, converter: converter}
+}
+
+func (tp simpleProxyList[T]) String() string {
+	return fmt.Sprint(tp.values)
+}
+
+func (tp simpleProxyList[T]) Truthy() bool {
+	return len(tp.values) > 0
+}
+
+func (tp simpleProxyList[T]) Len() int {
+	return len(tp.values)
+}
+
+func (tp simpleProxyList[T]) Index(k int) ucl.Object {
+	return tp.converter(tp.values[k])
+}
+
+func newResultSetProxy(rs *models.ResultSet) ucl.Object {
+	return SimpleProxy[*models.ResultSet]{value: rs, proxyInfo: resultSetProxyFields}
+}
+
+var resultSetProxyFields = &proxyInfo[*models.ResultSet]{
+	lenFunc: func(t *models.ResultSet) int { return len(t.Items()) },
+	strFunc: func(t *models.ResultSet) string {
+		return fmt.Sprintf("ResultSet(%v:%d)", t.TableInfo.Name, len(t.Items()))
+	},
+	fields: map[string]func(t *models.ResultSet) ucl.Object{
+		"Table":       func(t *models.ResultSet) ucl.Object { return newTableProxy(t.TableInfo) },
+		"Items":       func(t *models.ResultSet) ucl.Object { return resultSetItemsProxy{t} },
+		"HasNextPage": func(t *models.ResultSet) ucl.Object { return ucl.BoolObject(t.HasNextPage()) },
+	},
+}
+
+func newTableProxy(table *models.TableInfo) ucl.Object {
+	return SimpleProxy[*models.TableInfo]{value: table, proxyInfo: tableProxyFields}
+}
+
+var tableProxyFields = &proxyInfo[*models.TableInfo]{
+	strFunc: func(t *models.TableInfo) string {
+		return fmt.Sprintf("Table(%v)", t.Name)
+	},
+	fields: map[string]func(t *models.TableInfo) ucl.Object{
+		"Name":              func(t *models.TableInfo) ucl.Object { return ucl.StringObject(t.Name) },
+		"Keys":              func(t *models.TableInfo) ucl.Object { return newKeyAttributeProxy(t.Keys) },
+		"DefinedAttributes": func(t *models.TableInfo) ucl.Object { return ucl.StringListObject(t.DefinedAttributes) },
+		"GSIs":              func(t *models.TableInfo) ucl.Object { return newSimpleProxyList(t.GSIs, newGSIProxy) },
+	},
+}
+
+func newKeyAttributeProxy(keyAttrs models.KeyAttribute) ucl.Object {
+	return SimpleProxy[models.KeyAttribute]{value: keyAttrs, proxyInfo: keyAttributeProxyFields}
+}
+
+var keyAttributeProxyFields = &proxyInfo[models.KeyAttribute]{
+	strFunc: func(t models.KeyAttribute) string {
+		return fmt.Sprintf("KeyAttribute(%v,%v)", t.PartitionKey, t.SortKey)
+	},
+	fields: map[string]func(t models.KeyAttribute) ucl.Object{
+		"PK": func(t models.KeyAttribute) ucl.Object { return ucl.StringObject(t.PartitionKey) },
+		"SK": func(t models.KeyAttribute) ucl.Object { return ucl.StringObject(t.SortKey) },
+	},
+}
+
+func newGSIProxy(gsi models.TableGSI) ucl.Object {
+	return SimpleProxy[models.TableGSI]{value: gsi, proxyInfo: gsiProxyFields}
+}
+
+var gsiProxyFields = &proxyInfo[models.TableGSI]{
+	strFunc: func(t models.TableGSI) string {
+		return fmt.Sprintf("TableGSI(%v,(%v,%v))", t.Name, t.Keys.PartitionKey, t.Keys.SortKey)
+	},
+	fields: map[string]func(t models.TableGSI) ucl.Object{
+		"Name": func(t models.TableGSI) ucl.Object { return ucl.StringObject(t.Name) },
+		"Keys": func(t models.TableGSI) ucl.Object { return newKeyAttributeProxy(t.Keys) },
+	},
+}
+
+type resultSetItemsProxy struct {
+	resultSet *models.ResultSet
+}
+
+func (ip resultSetItemsProxy) String() string {
+	return "RSItem()"
+}
+
+func (ip resultSetItemsProxy) Truthy() bool {
+	return len(ip.resultSet.Items()) > 0
+}
+
+func (tp resultSetItemsProxy) Len() int {
+	return len(tp.resultSet.Items())
+}
+
+func (tp resultSetItemsProxy) Index(k int) ucl.Object {
+	return itemProxy{resultSet: tp.resultSet, idx: k, item: tp.resultSet.Items()[k]}
+}
+
+type itemProxy struct {
+	resultSet *models.ResultSet
+	idx       int
+	item      models.Item
+}
+
+func (ip itemProxy) String() string {
+	return fmt.Sprintf("RSItems(%v)", len(ip.item))
+}
+
+func (ip itemProxy) Truthy() bool {
+	return len(ip.item) > 0
+}
+
+func (tp itemProxy) Len() int {
+	return len(tp.item)
+}
+
+func (tp itemProxy) Value(k string) ucl.Object {
+	f, ok := tp.item[k]
+	if !ok {
+		return nil
+	}
+	return convertAttributeValueToUCLObject(f)
+}
+
+func (tp itemProxy) Each(fn func(k string, v ucl.Object) error) error {
+	for key := range maps.Keys(tp.item) {
+		if err := fn(key, tp.Value(key)); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func convertAttributeValueToUCLObject(attrValue types.AttributeValue) ucl.Object {
+	switch t := attrValue.(type) {
+	case *types.AttributeValueMemberS:
+		return ucl.StringObject(t.Value)
+	case *types.AttributeValueMemberN:
+		i, err := strconv.ParseInt(t.Value, 10, 64)
+		if err != nil {
+			return nil
+		}
+		return ucl.IntObject(i)
+	}
+	// TODO: the rest
+	return nil
+}

internal/common/ui/commandctrl/cmdpacks/pvars.go

@@ -0,0 +1,62 @@
+package cmdpacks
+
+import (
+	"context"
+	"github.com/lmika/dynamo-browse/internal/common/ui/commandctrl"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/controllers"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/models"
+	"github.com/pkg/errors"
+)
+
+type tablePVar struct {
+	state *controllers.State
+}
+
+func (rs tablePVar) Get(ctx context.Context) (any, error) {
+	return newTableProxy(rs.state.ResultSet().TableInfo), nil
+}
+
+type resultSetPVar struct {
+	state          *controllers.State
+	readController *controllers.TableReadController
+}
+
+func (rs resultSetPVar) Get(ctx context.Context) (any, error) {
+	return newResultSetProxy(rs.state.ResultSet()), nil
+}
+
+func (rs resultSetPVar) Set(ctx context.Context, value any) error {
+	rsVal, ok := value.(SimpleProxy[*models.ResultSet])
+	if !ok {
+		return errors.New("new value to @resultset is nil or not a result set")
+	}
+
+	msg := rs.readController.SetResultSet(rsVal.value)
+	commandctrl.PostMsg(ctx, msg)
+	return nil
+}
+
+type itemPVar struct {
+	state *controllers.State
+}
+
+func (rs itemPVar) Get(ctx context.Context) (any, error) {
+	selItem, ok := commandctrl.SelectedItemIndex(ctx)
+	if !ok {
+		return nil, errors.New("no item selected")
+	}
+	return itemProxy{rs.state.ResultSet(), selItem, rs.state.ResultSet().Items()[selItem]}, nil
+}
+
+func (rs itemPVar) Set(ctx context.Context, value any) error {
+	rsVal, ok := value.(itemProxy)
+	if !ok {
+		return errors.New("new value to @item is not an item")
+	}
+
+	if msg := commandctrl.SetSelectedItemIndex(ctx, rsVal.idx); msg != nil {
+		commandctrl.PostMsg(ctx, msg)
+	}
+
+	return nil
+}

internal/common/ui/commandctrl/cmdpacks/stdcmds.go

@@ -0,0 +1,421 @@
+package cmdpacks
+
+import (
+	"context"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/lmika/dynamo-browse/internal/common/ui/commandctrl"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/controllers"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/models"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/providers/pasteboardprovider"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services/tables"
+	"github.com/pkg/errors"
+	"ucl.lmika.dev/repl"
+	"ucl.lmika.dev/ucl"
+)
+
+type StandardCommands struct {
+	TableService         *tables.Service
+	State                *controllers.State
+	ReadController       *controllers.TableReadController
+	WriteController      *controllers.TableWriteController
+	ExportController     *controllers.ExportController
+	KeyBindingController *controllers.KeyBindingController
+	PBProvider           *pasteboardprovider.Provider
+
+	modUI ucl.Module
+}
+
+func NewStandardCommands(
+	tableService *tables.Service,
+	state *controllers.State,
+	readController *controllers.TableReadController,
+	writeController *controllers.TableWriteController,
+	exportController *controllers.ExportController,
+	keyBindingController *controllers.KeyBindingController,
+	pbProvider *pasteboardprovider.Provider,
+) StandardCommands {
+	modUI, ckbs := moduleUI(tableService, state, readController)
+	keyBindingController.SetCustomKeyBindingSource(ckbs)
+
+	return StandardCommands{
+		TableService:         tableService,
+		State:                state,
+		ReadController:       readController,
+		WriteController:      writeController,
+		ExportController:     exportController,
+		KeyBindingController: keyBindingController,
+		PBProvider:           pbProvider,
+		modUI:                modUI,
+	}
+}
+
+var cmdQuitDoc = repl.Doc{
+	Brief: "Quits dynamo-browse",
+	Detailed: `
+		This will quit dynamo-browse immediately, without prompting to apply
+		any changes.
+    `,
+}
+
+func (sc StandardCommands) cmdQuit(ctx context.Context, args ucl.CallArgs) (any, error) {
+	commandctrl.PostMsg(ctx, tea.Quit)
+	return nil, nil
+}
+
+var cmdTableDoc = repl.Doc{
+	Brief: "Prompt for table to scan",
+	Usage: "[NAME]",
+	Args: []repl.ArgDoc{
+		{Name: "name", Brief: "Name of the table to scan"},
+	},
+	Detailed: `
+		If called with an argument, it will scan the table with that name and
+		replace the current result set. If called without an argument, it will
+		prompt for a table to scan.
+
+		This command is intended only for interactive sessions and is not suitable
+		for scripting. The scan or table prompts will happen asynchronously.
+    `,
+}
+
+func (sc StandardCommands) cmdTable(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var tableName string
+	if err := args.Bind(&tableName); err == nil {
+		commandctrl.PostMsg(ctx, sc.ReadController.ScanTable(tableName))
+		return nil, nil
+	}
+
+	commandctrl.PostMsg(ctx, sc.ReadController.ListTables(false))
+	return nil, nil
+}
+
+var cmdExportDoc = repl.Doc{
+	Brief: "Exports a result-set as CSV",
+	Usage: "FILENAME [-all]",
+	Args: []repl.ArgDoc{
+		{Name: "filename", Brief: "Filename to export to"},
+		{Name: "-all", Brief: "Export all results from the table"},
+	},
+	Detailed: `
+		The fields of the current table view will be treated as the header of the
+		exported table.
+
+		This command is intended only for interactive sessions and is not suitable
+		for scripting. The export will run asynchronously.
+    `,
+}
+
+func (sc StandardCommands) cmdExport(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var filename string
+	if err := args.Bind(&filename); err != nil {
+		return nil, errors.New("expected filename")
+	}
+
+	opts := controllers.ExportOptions{
+		AllResults: args.HasSwitch("all"),
+	}
+
+	commandctrl.PostMsg(ctx, sc.ExportController.ExportCSV(filename, opts))
+	return nil, nil
+}
+
+var cmdMarkDoc = repl.Doc{
+	Brief: "Set the marked items of the current result-set",
+	Usage: "[WHAT] [-where EXPR]",
+	Args: []repl.ArgDoc{
+		{Name: "what", Brief: "Items to mark. Defaults to 'all'"},
+		{Name: "-where", Brief: "Filter expression select items to mark"},
+	},
+	Detailed: `
+		WHAT can be one of:
+
+		- all: Mark all items in the current result-set
+		- none: Unmark all items in the current result-set
+		- toggle: Toggle the marked state of all items in the current result-set
+    `,
+}
+
+func (sc StandardCommands) cmdMark(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var markOp = controllers.MarkOpMark
+
+	if args.NArgs() > 0 {
+		var markOpStr string
+		if err := args.Bind(&markOpStr); err == nil {
+			switch markOpStr {
+			case "all":
+				markOp = controllers.MarkOpMark
+			case "none":
+				markOp = controllers.MarkOpUnmark
+			case "toggle":
+				markOp = controllers.MarkOpToggle
+			default:
+				return nil, errors.New("unrecognised mark operation")
+			}
+		}
+	}
+
+	var whereExpr = ""
+	if args.HasSwitch("where") {
+		if err := args.BindSwitch("where", &whereExpr); err != nil {
+			return nil, err
+		}
+	}
+
+	commandctrl.PostMsg(ctx, sc.ReadController.Mark(markOp, whereExpr))
+	return nil, nil
+}
+
+var cmdNextPageDoc = repl.Doc{
+	Brief: "Retrieve and display the next page of the current result-set",
+	Detailed: `
+		This command is intended only for interactive sessions and is not suitable
+		for scripting. Fetching the next page will run asynchronously.
+    `,
+}
+
+func (sc StandardCommands) cmdNextPage(ctx context.Context, args ucl.CallArgs) (any, error) {
+	commandctrl.PostMsg(ctx, sc.ReadController.NextPage())
+	return nil, nil
+}
+
+var cmdDeleteDoc = repl.Doc{
+	Brief: "Delete the marked items of the current result-set",
+	Detailed: `
+		The user will be prompted to confirm the deletion. If approved, the
+		items will be deleted immediately.
+
+		This command is intended only for interactive sessions and is not suitable
+		for scripting.
+    `,
+}
+
+func (sc StandardCommands) cmdDelete(ctx context.Context, args ucl.CallArgs) (any, error) {
+	commandctrl.PostMsg(ctx, sc.WriteController.DeleteMarked())
+	return nil, nil
+}
+
+var cmdNewItemDoc = repl.Doc{
+	Brief: "Adds a new item to the current result-set",
+	Detailed: `
+		The user will be prompted to enter the values for each required attribute,
+		such as the partition and sort key. The new item will be commited to the database
+		upon the next write.
+
+		This command is intended only for interactive sessions and is not suitable
+		for scripting.
+    `,
+}
+
+func (sc StandardCommands) cmdNewItem(ctx context.Context, args ucl.CallArgs) (any, error) {
+	commandctrl.PostMsg(ctx, sc.WriteController.NewItem())
+	return nil, nil
+}
+
+var cmdCloneDoc = repl.Doc{
+	Brief: "Adds a copy of the selected item as a new item to the current result-set",
+	Detailed: `
+		The user will be prompted to enter the partition and sort key. All other
+		attributes will be cloned from the selected item. The new item will be
+		commited to the database upon the next write.
+
+		This command is intended only for interactive sessions and is not suitable
+		for scripting.
+    `,
+}
+
+func (sc StandardCommands) cmdClone(ctx context.Context, args ucl.CallArgs) (any, error) {
+	selectedItemIndex, ok := commandctrl.SelectedItemIndex(ctx)
+	if !ok {
+		return nil, errors.New("no item selected")
+	}
+
+	commandctrl.PostMsg(ctx, sc.WriteController.CloneItem(selectedItemIndex))
+	return nil, nil
+}
+
+var cmdSetAttrDoc = repl.Doc{
+	Brief: "Modify a field value of the selected or marked items",
+	Usage: "ATTR [TYPE]",
+	Args: []repl.ArgDoc{
+		{Name: "attr", Brief: "Attribute to modify"},
+		{Name: "-S", Brief: "Set attribute to a string"},
+		{Name: "-N", Brief: "Set attribute to a number"},
+		{Name: "-BOOL", Brief: "Set attribute to a boolean"},
+		{Name: "-NULL", Brief: "Set attribute to a null"},
+		{Name: "-TO", Brief: "Set attribute to the result of an expression"},
+	},
+	Detailed: `
+		The user will be prompted to enter the new value for the attribute.
+		If the attribute type is not known, then a type will need to be specified.
+		Otherwise, the type will be unchanged. The modified item will be
+		commited to the database upon the next write.
+    `,
+}
+
+func (sc StandardCommands) cmdSetAttr(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var fieldName string
+	if err := args.Bind(&fieldName); err != nil {
+		return nil, errors.New("expected field name")
+	}
+
+	selectedItemIndex, ok := commandctrl.SelectedItemIndex(ctx)
+	if !ok {
+		return nil, errors.New("no item selected")
+	}
+
+	var itemType = models.UnsetItemType
+	switch {
+	case args.HasSwitch("S"):
+		itemType = models.StringItemType
+	case args.HasSwitch("N"):
+		itemType = models.NumberItemType
+	case args.HasSwitch("BOOL"):
+		itemType = models.BoolItemType
+	case args.HasSwitch("NULL"):
+		itemType = models.NullItemType
+	case args.HasSwitch("TO"):
+		itemType = models.ExprValueItemType
+	}
+
+	commandctrl.PostMsg(ctx, sc.WriteController.SetAttributeValue(selectedItemIndex, itemType, fieldName))
+	return nil, nil
+}
+
+var cmdDelAttrDoc = repl.Doc{
+	Brief: "Remove the field of the selected or marked items",
+	Usage: "ATTR",
+	Args: []repl.ArgDoc{
+		{Name: "attr", Brief: "Attribute to remove"},
+	},
+	Detailed: `
+		The modified item will be commited to the database upon the next write.
+    `,
+}
+
+func (sc StandardCommands) cmdDelAttr(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var fieldName string
+	if err := args.Bind(&fieldName); err != nil {
+		return nil, errors.New("expected field name")
+	}
+
+	selectedItemIndex, ok := commandctrl.SelectedItemIndex(ctx)
+	if !ok {
+		return nil, errors.New("no item selected")
+	}
+
+	commandctrl.PostMsg(ctx, sc.WriteController.DeleteAttribute(selectedItemIndex, fieldName))
+	return nil, nil
+}
+
+var cmdPutDoc = repl.Doc{
+	Brief: "Commit changes to the table",
+	Detailed: `
+		This will put all new and modified items.
+
+		This command is intended only for interactive sessions and is not suitable
+		for scripting. The user will be prompted to confirm the changes.
+    `,
+}
+
+func (sc StandardCommands) cmdPut(ctx context.Context, args ucl.CallArgs) (any, error) {
+	commandctrl.PostMsg(ctx, sc.WriteController.PutItems())
+	return nil, nil
+}
+
+var cmdTouchDoc = repl.Doc{
+	Brief: "Put the currently selected item",
+	Detailed: `
+		This will put the currently selected item, regardless of whether it has been
+		modified.
+
+		This command is intended only for interactive sessions and is not suitable
+		for scripting. The user will be prompted to confirm the touch.
+    `,
+}
+
+func (sc StandardCommands) cmdTouch(ctx context.Context, args ucl.CallArgs) (any, error) {
+	selectedItemIndex, ok := commandctrl.SelectedItemIndex(ctx)
+	if !ok {
+		return nil, errors.New("no item selected")
+	}
+
+	commandctrl.PostMsg(ctx, sc.WriteController.TouchItem(selectedItemIndex))
+	return nil, nil
+}
+
+var cmdNoisyTouchDoc = repl.Doc{
+	Brief: "Put the currently selected item by deleting it first",
+	Detailed: `
+		This will put the currently selected item, regardless of whether it has been
+		modified. It does so by removing the item from the table, then adding it back again.
+
+		This command is intended only for interactive sessions and is not suitable
+		for scripting. The user will be prompted to confirm the touch.
+    `,
+}
+
+func (sc StandardCommands) cmdNoisyTouch(ctx context.Context, args ucl.CallArgs) (any, error) {
+	selectedItemIndex, ok := commandctrl.SelectedItemIndex(ctx)
+	if !ok {
+		return nil, errors.New("no item selected")
+	}
+
+	commandctrl.PostMsg(ctx, sc.WriteController.NoisyTouchItem(selectedItemIndex))
+	return nil, nil
+}
+
+var cmdRebindDoc = repl.Doc{
+	Brief: "Binds a new key to an action",
+	Usage: "ACTION KEY",
+	Args: []repl.ArgDoc{
+		{Name: "action", Brief: "Action to bind"},
+		{Name: "key", Brief: "Key to bind"},
+	},
+	Detailed: `
+		If the key is already bound to an action, it will be replaced.
+		The set of actions this command accepts is well-defined. For binding
+		to arbitrary actions, use the ui:bind command.
+    `,
+}
+
+func (sc StandardCommands) cmdRebind(ctx context.Context, args ucl.CallArgs) (any, error) {
+	var bindingName, newKey string
+	if err := args.Bind(&bindingName, &newKey); err != nil {
+		return nil, errors.New("expected: bindingName newKey")
+	}
+
+	// TODO: should only force if not interactive
+	commandctrl.PostMsg(ctx, sc.KeyBindingController.Rebind(bindingName, newKey, false))
+	return nil, nil
+}
+
+func (sc StandardCommands) InstOptions() []ucl.InstOption {
+	return []ucl.InstOption{
+		ucl.WithModule(moduleRS(sc.TableService, sc.State)),
+		ucl.WithModule(sc.modUI),
+		ucl.WithModule(modulePB(sc.PBProvider)),
+	}
+}
+
+func (sc StandardCommands) ConfigureUCL(ucl *ucl.Inst) {
+	ucl.SetBuiltin("quit", sc.cmdQuit)
+	ucl.SetBuiltin("table", sc.cmdTable)
+	ucl.SetBuiltin("export", sc.cmdExport)
+	ucl.SetBuiltin("mark", sc.cmdMark)
+	// unmark --> alias for { mark none }
+	ucl.SetBuiltin("next-page", sc.cmdNextPage)
+	ucl.SetBuiltin("delete", sc.cmdDelete)
+	ucl.SetBuiltin("new-item", sc.cmdNewItem)
+	ucl.SetBuiltin("clone", sc.cmdClone)
+	ucl.SetBuiltin("set-attr", sc.cmdSetAttr)
+	ucl.SetBuiltin("del-attr", sc.cmdDelAttr)
+	ucl.SetBuiltin("put", sc.cmdPut)
+	ucl.SetBuiltin("touch", sc.cmdTouch)
+	ucl.SetBuiltin("noisy-touch", sc.cmdNoisyTouch)
+	ucl.SetBuiltin("rebind", sc.cmdRebind)
+	// set-opt --> alias to opts:set
+
+	ucl.SetPseudoVar("resultset", resultSetPVar{sc.State, sc.ReadController})
+	ucl.SetPseudoVar("table", tablePVar{sc.State})
+	ucl.SetPseudoVar("item", itemPVar{sc.State})
+}

internal/common/ui/commandctrl/cmdpacks/stdcmds_test.go

@@ -0,0 +1,211 @@
+package cmdpacks_test
+
+import (
+	"fmt"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/lmika/dynamo-browse/internal/common/ui/commandctrl"
+	"github.com/lmika/dynamo-browse/internal/common/ui/commandctrl/cmdpacks"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/controllers"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/providers/dynamo"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/providers/inputhistorystore"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/providers/pasteboardprovider"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/providers/settingstore"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/providers/workspacestore"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services/inputhistory"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services/itemrenderer"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services/jobs"
+	keybindings_service "github.com/lmika/dynamo-browse/internal/dynamo-browse/services/keybindings"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services/tables"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services/viewsnapshot"
+	"github.com/lmika/dynamo-browse/internal/dynamo-browse/ui/keybindings"
+	"github.com/lmika/dynamo-browse/test/testdynamo"
+	"github.com/lmika/dynamo-browse/test/testworkspace"
+	bus "github.com/lmika/events"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestStdCmds_Mark(t *testing.T) {
+	tests := []struct {
+		descr     string
+		cmd       string
+		wantMarks []bool
+	}{
+		{descr: "mark default", cmd: "mark", wantMarks: []bool{true, true, true}},
+		{descr: "mark all", cmd: "mark all", wantMarks: []bool{true, true, true}},
+		{descr: "mark none", cmd: "mark none", wantMarks: []bool{false, false, false}},
+		{descr: "mark where", cmd: `mark -where 'sk="222"'`, wantMarks: []bool{false, true, false}},
+		{descr: "mark toggle", cmd: "mark ; mark toggle", wantMarks: []bool{false, false, false}},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.descr, func(t *testing.T) {
+			svc := newService(t)
+
+			_, err := svc.CommandController.ExecuteAndWait(t.Context(), tt.cmd)
+			assert.NoError(t, err)
+
+			for i, want := range tt.wantMarks {
+				assert.Equal(t, want, svc.State.ResultSet().Marked(i))
+			}
+		})
+	}
+}
+
+type testDataGenerator func() []testdynamo.TestData
+type services struct {
+	CommandController *commandctrl.CommandController
+	SelItemIndex      int
+
+	State *controllers.State
+
+	settingStore *settingstore.SettingStore
+	table        string
+
+	testDataGenerator testDataGenerator
+	testData          []testdynamo.TestData
+}
+
+type serviceOpt func(*services)
+
+func withDataGenerator(tg testDataGenerator) serviceOpt {
+	return func(s *services) {
+		s.testDataGenerator = tg
+	}
+}
+
+func withTable(table string) serviceOpt {
+	return func(s *services) {
+		s.table = table
+	}
+}
+
+func withDefaultLimit(limit int) serviceOpt {
+	return func(s *services) {
+		s.settingStore.SetDefaultLimit(limit)
+	}
+}
+
+func newService(t *testing.T, opts ...serviceOpt) *services {
+	ws := testworkspace.New(t)
+
+	resultSetSnapshotStore := workspacestore.NewResultSetSnapshotStore(ws)
+	settingStore := settingstore.New(ws)
+	inputHistoryStore := inputhistorystore.NewInputHistoryStore(ws)
+
+	workspaceService := viewsnapshot.NewService(resultSetSnapshotStore)
+	itemRendererService := itemrenderer.NewService(itemrenderer.PlainTextRenderer(), itemrenderer.PlainTextRenderer())
+	inputHistoryService := inputhistory.New(inputHistoryStore)
+
+	s := &services{
+		table:             "service-test-data",
+		settingStore:      settingStore,
+		testDataGenerator: normalTestData,
+	}
+
+	for _, opt := range opts {
+		opt(s)
+	}
+
+	s.testData = s.testDataGenerator()
+	client := testdynamo.SetupTestTable(t, s.testData)
+
+	provider := dynamo.NewProvider(client)
+	service := tables.NewService(provider, settingStore)
+	eventBus := bus.New()
+
+	state := controllers.NewState()
+	jobsController := controllers.NewJobsController(jobs.NewService(eventBus), eventBus, true)
+
+	readController := controllers.NewTableReadController(
+		state,
+		service,
+		workspaceService,
+		itemRendererService,
+		jobsController,
+		inputHistoryService,
+		eventBus,
+		pasteboardprovider.NilProvider{},
+		nil,
+		s.table,
+	)
+	writeController := controllers.NewTableWriteController(state, service, jobsController, readController, settingStore)
+	settingsController := controllers.NewSettingsController(settingStore, eventBus)
+	columnsController := controllers.NewColumnsController(readController, eventBus)
+	exportController := controllers.NewExportController(state, service, jobsController, columnsController, pasteboardprovider.NilProvider{})
+
+	keyBindingService := keybindings_service.NewService(keybindings.Default())
+	keyBindingController := controllers.NewKeyBindingController(keyBindingService, nil)
+
+	_ = settingsController
+	commandController := commandctrl.NewCommandController(inputHistoryService,
+		cmdpacks.NewStandardCommands(service, state, readController, writeController, exportController, keyBindingController),
+	)
+
+	s.State = state
+	s.CommandController = commandController
+
+	commandController.SetUIStateProvider(s)
+	readController.Init()
+
+	return s
+}
+
+func (s *services) SelectedItemIndex() int {
+	return s.SelItemIndex
+}
+
+func (s *services) SetSelectedItemIndex(newIdx int) tea.Msg {
+	s.SelItemIndex = newIdx
+	return nil
+}
+
+func normalTestData() []testdynamo.TestData {
+	return []testdynamo.TestData{
+		{
+			TableName: "service-test-data",
+			Data: []map[string]interface{}{
+				{
+					"pk":    "abc",
+					"sk":    "111",
+					"alpha": "This is some value",
+				},
+				{
+					"pk":    "abc",
+					"sk":    "222",
+					"alpha": "This is another some value",
+					"beta":  1231,
+				},
+				{
+					"pk":    "bbb",
+					"sk":    "131",
+					"beta":  2468,
+					"gamma": "foobar",
+				},
+			},
+		},
+	}
+}
+
+func largeTestData() []testdynamo.TestData {
+	return []testdynamo.TestData{
+		{
+			TableName: "large-table",
+			Data: genRow(50, func(i int) map[string]interface{} {
+				return map[string]interface{}{
+					"pk":    fmt.Sprint(i),
+					"sk":    fmt.Sprint(i),
+					"alpha": fmt.Sprintf("row %v", i),
+				}
+			}),
+		},
+	}
+}
+
+func genRow(count int, mapFn func(int) map[string]interface{}) []map[string]interface{} {
+	result := make([]map[string]interface{}, count)
+	for i := 0; i < count; i++ {
+		result[i] = mapFn(i)
+	}
+	return result
+}

internal/common/ui/commandctrl/commandctrl.go

@@ -1,9 +1,9 @@
 package commandctrl
 
 import (
-	"bufio"
 	"bytes"
 	"context"
+	"fmt"
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/pkg/errors"
 	"log"
@@ -11,6 +11,7 @@ import (
 	"path/filepath"
 	"strings"
 	"ucl.lmika.dev/ucl"
+	"ucl.lmika.dev/ucl/builtins"
 
 	"github.com/lmika/dynamo-browse/internal/common/ui/events"
 	"github.com/lmika/shellwords"
@@ -18,25 +19,49 @@ import (
 
 const commandsCategory = "commands"
 
+type cmdMessage struct {
+	cmd string
+}
+
 type CommandController struct {
 	uclInst            *ucl.Inst
 	historyProvider    IterProvider
 	commandList        *CommandList
-	msgSender          func(tea.Msg)
 	lookupExtensions   []CommandLookupExtension
 	completionProvider CommandCompletionProvider
+	uiStateProvider    UIStateProvider
+	cmdChan            chan cmdMessage
+	msgChan            chan tea.Msg
+	interactive        bool
 }
 
-func NewCommandController(historyProvider IterProvider) *CommandController {
+func NewCommandController(historyProvider IterProvider, pkgs ...CommandPack) *CommandController {
 	cc := &CommandController{
 		historyProvider:  historyProvider,
 		commandList:      nil,
 		lookupExtensions: nil,
+		cmdChan:          make(chan cmdMessage),
+		msgChan:          make(chan tea.Msg),
+		interactive:      true,
 	}
-	cc.uclInst = ucl.New(
+
+	options := []ucl.InstOption{
 		ucl.WithOut(ucl.LineHandler(cc.printLine)),
-		ucl.WithMissingBuiltinHandler(cc.cmdInvoker),
+		ucl.WithModule(builtins.OS()),
-	)
+		ucl.WithModule(builtins.FS(nil)),
+	}
+	for _, pkg := range pkgs {
+		options = append(options, pkg.InstOptions()...)
+	}
+
+	cc.uclInst = ucl.New(options...)
+
+	for _, pkg := range pkgs {
+		pkg.ConfigureUCL(cc.uclInst)
+	}
+
+	go cc.cmdLooper()
+
 	return cc
 }
 
@@ -45,8 +70,14 @@ func (c *CommandController) AddCommands(ctx *CommandList) {
 	c.commandList = ctx
 }
 
-func (c *CommandController) SetMessageSender(msg func(tea.Msg)) {
+func (c *CommandController) StartMessageSender(msgSender func(tea.Msg)) {
-	c.msgSender = msg
+	for msg := range c.msgChan {
+		msgSender(msg)
+	}
+}
+
+func (c *CommandController) SetUIStateProvider(provider UIStateProvider) {
+	c.uiStateProvider = provider
 }
 
 func (c *CommandController) AddCommandLookupExtension(ext CommandLookupExtension) {
@@ -95,17 +126,57 @@ func (c *CommandController) execute(ctx ExecContext, commandInput string) tea.Ms
 		return nil
 	}
 
-	res, err := c.uclInst.Eval(context.Background(), commandInput)
+	select {
-	if err != nil {
+	case c.cmdChan <- cmdMessage{cmd: input}:
-		return events.Error(err)
+		// good
+	default:
+		return events.Error(errors.New("command currently running"))
 	}
 
-	if teaMsg, ok := res.(teaMsgWrapper); ok {
-		return teaMsg.msg
-	}
 	return nil
 }
 
+func (c *CommandController) ExecuteAndWait(ctx context.Context, commandInput string) (any, error) {
+	return c.uclInst.EvalString(ctx, commandInput)
+}
+
+func (c *CommandController) Invoke(invokable ucl.Invokable, args []any) (msg tea.Msg) {
+	execCtx := execContext{ctrl: c}
+	ctx := context.WithValue(context.Background(), commandCtlKey, &execCtx)
+
+	res, err := invokable.Invoke(ctx, args)
+	if err != nil {
+		msg = events.Error(err)
+	} else if res != nil {
+		msg = events.StatusMsg(fmt.Sprint(res))
+	}
+	if execCtx.requestRefresh {
+		c.postMessage(events.ResultSetUpdated{})
+	}
+
+	return msg
+}
+
+func (c *CommandController) cmdLooper() {
+	execCtx := execContext{ctrl: c}
+	ctx := context.WithValue(context.Background(), commandCtlKey, &execCtx)
+
+	for {
+		select {
+		case cmdChan := <-c.cmdChan:
+			res, err := c.ExecuteAndWait(ctx, cmdChan.cmd)
+			if err != nil {
+				c.postMessage(events.Error(err))
+			} else if res != nil {
+				c.postMessage(events.StatusMsg(fmt.Sprint(res)))
+			}
+			if execCtx.requestRefresh {
+				c.postMessage(events.ResultSetUpdated{})
+			}
+		}
+	}
+}
+
 func (c *CommandController) Alias(commandName string) Command {
 	return func(ctx ExecContext, args ucl.CallArgs) tea.Msg {
 		command := c.lookupCommand(commandName)
@@ -132,41 +203,78 @@ func (c *CommandController) lookupCommand(name string) Command {
 	return nil
 }
 
-func (c *CommandController) ExecuteFile(filename string) error {
+func (c *CommandController) LoadExtensions(ctx context.Context, baseDirs []string) error {
-	baseFilename := filepath.Base(filename)
+	log.Printf("loading extensions: %v", baseDirs)
+	for _, baseDir := range baseDirs {
+		baseDir = os.ExpandEnv(baseDir)
+		descendIntoSubDirs := !strings.HasSuffix(baseDir, ".")
 
-	if rcFile, err := os.ReadFile(filename); err == nil {
+		if stat, err := os.Stat(baseDir); err != nil {
-		if err := c.executeFile(rcFile, baseFilename); err != nil {
+			if os.IsNotExist(err) {
-			return errors.Wrapf(err, "error executing %v", filename)
+				continue
+			}
+			return err
+		} else if !stat.IsDir() {
+			continue
+		}
+
+		log.Printf("walking %v", baseDir)
+		if err := filepath.Walk(baseDir, func(path string, info os.FileInfo, err error) error {
+			if err != nil {
+				return err
+			}
+			if info.IsDir() {
+				if !descendIntoSubDirs && path != baseDir {
+					return filepath.SkipDir
+				}
+				return nil
+			}
+			if strings.HasSuffix(info.Name(), ".ucl") {
+				if err := c.ExecuteFile(ctx, path); err != nil {
+					log.Println(err)
+				}
+				log.Printf("loaded %v\n", path)
+			}
+			return nil
+		}); err != nil {
+			return err
 		}
-	} else {
-		return errors.Wrapf(err, "error loading %v", filename)
 	}
 	return nil
 }
 
-func (c *CommandController) executeFile(file []byte, filename string) error {
+func (c *CommandController) ExecuteFile(ctx context.Context, filename string) error {
-	scnr := bufio.NewScanner(bytes.NewReader(file))
+	oldInteractive := c.interactive
+	c.interactive = false
+	defer func() {
+		c.interactive = oldInteractive
+	}()
 
-	lineNo := 0
+	baseFilename := filepath.Base(filename)
-	for scnr.Scan() {
+
-		lineNo++
+	execCtx := execContext{ctrl: c}
-		line := strings.TrimSpace(scnr.Text())
+	ctx = context.WithValue(context.Background(), commandCtlKey, &execCtx)
-		if line == "" {
+
-			continue
+	if rcFile, err := os.ReadFile(filename); err == nil {
-		} else if line[0] == '#' {
+		if err := c.executeFile(ctx, rcFile); err != nil {
-			continue
+			return errors.Wrapf(err, "error executing %v", baseFilename)
+		}
+	} else {
+		return errors.Wrapf(err, "error loading %v", baseFilename)
+	}
+	return nil
+}
+
+func (c *CommandController) executeFile(ctx context.Context, file []byte) error {
+	if _, err := c.uclInst.Eval(ctx, bytes.NewReader(file), ucl.WithSubEnv()); err != nil {
+		return err
 	}
 
-		msg := c.execute(ExecContext{FromFile: true}, line)
+	return nil
-		switch m := msg.(type) {
+}
-		case events.ErrorMsg:
+
-			log.Printf("%v:%v: error - %v", filename, lineNo, m.Error())
+func (c *CommandController) Inst() *ucl.Inst {
-		case events.StatusMsg:
+	return c.uclInst
-			log.Printf("%v:%v: %v", filename, lineNo, string(m))
-		}
-	}
-	return scnr.Err()
 }
 
 func (c *CommandController) cmdInvoker(ctx context.Context, name string, args ucl.CallArgs) (any, error) {
@@ -183,9 +291,24 @@ func (c *CommandController) cmdInvoker(ctx context.Context, name string, args uc
 }
 
 func (c *CommandController) printLine(s string) {
-	if c.msgSender != nil {
+	if c.msgChan == nil || !c.interactive {
-		c.msgSender(events.StatusMsg(s))
+		log.Println(s)
+		return
 	}
+
+	select {
+	case c.msgChan <- events.StatusMsg(s):
+	default:
+		log.Println(s)
+	}
+}
+
+func (c *CommandController) postMessage(msg tea.Msg) {
+	if c.msgChan == nil {
+		return
+	}
+
+	c.msgChan <- msg
 }
 
 type teaMsgWrapper struct {

internal/common/ui/commandctrl/ctx.go

@@ -0,0 +1,63 @@
+package commandctrl
+
+import (
+	"context"
+	tea "github.com/charmbracelet/bubbletea"
+	"ucl.lmika.dev/ucl"
+)
+
+type commandCtlKeyType struct{}
+
+var commandCtlKey = commandCtlKeyType{}
+
+type execContext struct {
+	ctrl           *CommandController
+	requestRefresh bool
+}
+
+func PostMsg(ctx context.Context, msg tea.Msg) {
+	cmdCtl, ok := ctx.Value(commandCtlKey).(*execContext)
+	if ok {
+		cmdCtl.ctrl.postMessage(msg)
+	}
+}
+
+func SelectedItemIndex(ctx context.Context) (int, bool) {
+	cmdCtl, ok := ctx.Value(commandCtlKey).(*execContext)
+	if !ok {
+		return 0, false
+	}
+
+	return cmdCtl.ctrl.uiStateProvider.SelectedItemIndex(), true
+}
+
+func SetSelectedItemIndex(ctx context.Context, newIdx int) tea.Msg {
+	cmdCtl, ok := ctx.Value(commandCtlKey).(*execContext)
+	if !ok {
+		return nil
+	}
+
+	return cmdCtl.ctrl.uiStateProvider.SetSelectedItemIndex(newIdx)
+}
+
+func GetInvoker(ctx context.Context) Invoker {
+	cmdCtl, ok := ctx.Value(commandCtlKey).(*execContext)
+	if !ok {
+		return nil
+	}
+
+	return cmdCtl.ctrl
+}
+
+func QueueRefresh(ctx context.Context) {
+	cmdCtl, ok := ctx.Value(commandCtlKey).(*execContext)
+	if !ok {
+		return
+	}
+	cmdCtl.requestRefresh = true
+}
+
+type Invoker interface {
+	Invoke(invokable ucl.Invokable, args []any) tea.Msg
+	Inst() *ucl.Inst
+}

internal/common/ui/commandctrl/iface.go

@@ -2,9 +2,15 @@ package commandctrl
 
 import (
 	"context"
+	tea "github.com/charmbracelet/bubbletea"
 	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services"
 )
 
 type IterProvider interface {
 	Iter(ctx context.Context, category string) services.HistoryProvider
 }
+
+type UIStateProvider interface {
+	SelectedItemIndex() int
+	SetSelectedItemIndex(newIdx int) tea.Msg
+}

internal/common/ui/commandctrl/packs.go

@@ -0,0 +1,8 @@
+package commandctrl
+
+import "ucl.lmika.dev/ucl"
+
+type CommandPack interface {
+	InstOptions() []ucl.InstOption
+	ConfigureUCL(ucl *ucl.Inst)
+}

internal/common/ui/events/resultset.go

@@ -0,0 +1,5 @@
+package events
+
+type ResultSetUpdated struct {
+	StatusMessage string
+}

internal/dynamo-browse/controllers/events.go

@@ -81,14 +81,6 @@ type PromptForTableMsg struct {
 	OnSelected func(tableName string) tea.Msg
 }
 
-type ResultSetUpdated struct {
-	statusMessage string
-}
-
-func (rs ResultSetUpdated) StatusMessage() string {
-	return rs.statusMessage
-}
-
 type ShowColumnOverlay struct{}
 type HideColumnOverlay struct{}
 

internal/dynamo-browse/controllers/export.go

@@ -107,7 +107,7 @@ func (c *ExportController) ExportCSVToClipboard() tea.Msg {
 	if err := c.pasteboardProvider.WriteText(bts.Bytes()); err != nil {
 		return events.Error(err)
 	}
-	return nil
+	return events.StatusMsg("Table copied to clipboard")
 }
 
 // TODO: this really needs to be a service!

internal/dynamo-browse/controllers/keybinding.go

@@ -20,6 +20,10 @@ func NewKeyBindingController(service *keybindings.Service, customBindingSource C
 	}
 }
 
+func (kb *KeyBindingController) SetCustomKeyBindingSource(customBindingSource CustomKeyBindingSource) {
+	kb.customBindingSource = customBindingSource
+}
+
 func (kb *KeyBindingController) Rebind(bindingName string, newKey string, force bool) tea.Msg {
 	existingBinding := kb.findExistingBinding(newKey)
 	if existingBinding == "" {

internal/dynamo-browse/controllers/state.go

@@ -29,6 +29,14 @@ func (s *State) Filter() string {
 	return s.filter
 }
 
+func (s *State) SetResultSet(resultSet *models.ResultSet) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	s.resultSet = resultSet
+	s.filter = ""
+}
+
 func (s *State) withResultSet(rs func(*models.ResultSet)) {
 	s.mutex.Lock()
 	defer s.mutex.Unlock()

internal/dynamo-browse/controllers/tableread.go

@@ -182,6 +182,10 @@ func (c *TableReadController) PromptForQuery() tea.Msg {
 	}
 }
 
+func (c *TableReadController) RunQuery(q *queryexpr.QueryExpr, table *models.TableInfo) tea.Msg {
+	return c.runQuery(table, q, "", true, nil)
+}
+
 func (c *TableReadController) runQuery(
 	tableInfo *models.TableInfo,
 	query *queryexpr.QueryExpr,
@@ -291,6 +295,12 @@ func (c *TableReadController) setResultSetAndFilter(resultSet *models.ResultSet,
 	return c.state.buildNewResultSetMessage("")
 }
 
+func (c *TableReadController) SetResultSet(resultSet *models.ResultSet) tea.Msg {
+	c.state.setResultSetAndFilter(resultSet, "")
+	c.eventBus.Fire(newResultSetEvent, resultSet, resultSetUpdateScript)
+	return c.state.buildNewResultSetMessage("")
+}
+
 func (c *TableReadController) Mark(op MarkOp, where string) tea.Msg {
 	var (
 		whereExpr *queryexpr.QueryExpr
@@ -333,14 +343,20 @@ func (c *TableReadController) Mark(op MarkOp, where string) tea.Msg {
 	}); err != nil {
 		return events.Error(err)
 	}
-	return ResultSetUpdated{}
+	return events.ResultSetUpdated{}
 }
 
-func (c *TableReadController) Filter() tea.Msg {
+func (c *TableReadController) PromptForFilter() tea.Msg {
 	return events.PromptForInputMsg{
 		Prompt:  "filter: ",
 		History: c.inputHistoryService.Iter(context.Background(), filterInputHistoryCategory),
 		OnDone: func(value string) tea.Msg {
+			return c.Filter(value)
+		},
+	}
+}
+
+func (c *TableReadController) Filter(value string) tea.Msg {
 	resultSet := c.state.ResultSet()
 	if resultSet == nil {
 		return events.StatusMsg("Result-set is nil")
@@ -350,8 +366,6 @@ func (c *TableReadController) Filter() tea.Msg {
 		newResultSet := c.tableService.Filter(resultSet, value)
 		return newResultSet, nil
 	}).OnEither(c.handleResultSetFromJobResult(value, true, false, resultSetUpdateFilter)).Submit()
-		},
-	}
 }
 
 func (c *TableReadController) handleResultSetFromJobResult(

internal/dynamo-browse/controllers/tablewrite.go

@@ -44,7 +44,7 @@ func (twc *TableWriteController) ToggleMark(idx int) tea.Msg {
 		resultSet.SetMark(idx, !resultSet.Marked(idx))
 	})
 
-	return ResultSetUpdated{}
+	return events.ResultSetUpdated{}
 }
 
 func (twc *TableWriteController) NewItem() tea.Msg {
@@ -148,7 +148,7 @@ func (twc *TableWriteController) setStringValue(idx int, attr *queryexpr.QueryEx
 			}); err != nil {
 				return events.Error(err)
 			}
-			return ResultSetUpdated{}
+			return events.ResultSetUpdated{}
 		},
 	}
 }
@@ -181,7 +181,7 @@ func (twc *TableWriteController) setToExpressionValue(idx int, attr *queryexpr.Q
 			}); err != nil {
 				return events.Error(err)
 			}
-			return ResultSetUpdated{}
+			return events.ResultSetUpdated{}
 		},
 	}
 }
@@ -205,7 +205,7 @@ func (twc *TableWriteController) setNumberValue(idx int, attr *queryexpr.QueryEx
 			}); err != nil {
 				return events.Error(err)
 			}
-			return ResultSetUpdated{}
+			return events.ResultSetUpdated{}
 		},
 	}
 }
@@ -234,7 +234,7 @@ func (twc *TableWriteController) setBoolValue(idx int, attr *queryexpr.QueryExpr
 			}); err != nil {
 				return events.Error(err)
 			}
-			return ResultSetUpdated{}
+			return events.ResultSetUpdated{}
 		},
 	}
 }
@@ -255,7 +255,7 @@ func (twc *TableWriteController) setNullValue(idx int, attr *queryexpr.QueryExpr
 	}); err != nil {
 		return events.Error(err)
 	}
-	return ResultSetUpdated{}
+	return events.ResultSetUpdated{}
 }
 
 func (twc *TableWriteController) DeleteAttribute(idx int, key string) tea.Msg {
@@ -291,7 +291,7 @@ func (twc *TableWriteController) DeleteAttribute(idx int, key string) tea.Msg {
 		return events.Error(err)
 	}
 
-	return ResultSetUpdated{}
+	return events.ResultSetUpdated{}
 }
 
 func (twc *TableWriteController) PutItems() tea.Msg {
@@ -351,8 +351,8 @@ func (twc *TableWriteController) PutItems() tea.Msg {
 				}
 				return rs, nil
 			}).OnDone(func(rs *models.ResultSet) tea.Msg {
-				return ResultSetUpdated{
+				return events.ResultSetUpdated{
-					statusMessage: applyToN("", len(itemsToPut), "item", "item", " put to table"),
+					StatusMessage: applyToN("", len(itemsToPut), "item", "item", " put to table"),
 				}
 			}).Submit()
 		},
@@ -379,7 +379,7 @@ func (twc *TableWriteController) TouchItem(idx int) tea.Msg {
 			if err := twc.tableService.PutItemAt(context.Background(), resultSet, idx); err != nil {
 				return events.Error(err)
 			}
-			return ResultSetUpdated{}
+			return events.ResultSetUpdated{}
 		},
 	}
 }

internal/dynamo-browse/models/models.go

@@ -151,3 +151,37 @@ func (rs *ResultSet) Sort(criteria SortCriteria) {
 	rs.sortCriteria = criteria
 	Sort(rs.items, criteria)
 }
+
+func (rs *ResultSet) MergeWith(otherRS *ResultSet) *ResultSet {
+	type pksk struct {
+		pk types.AttributeValue
+		sk types.AttributeValue
+	}
+
+	if !rs.TableInfo.Equal(otherRS.TableInfo) {
+		return nil
+	}
+
+	itemsInI := make(map[pksk]Item)
+	newItems := make([]Item, 0, len(rs.Items())+len(otherRS.Items()))
+	for _, item := range rs.Items() {
+		pk, sk := item.PKSK(rs.TableInfo)
+		itemsInI[pksk{pk, sk}] = item
+		newItems = append(newItems, item)
+	}
+
+	for _, item := range otherRS.Items() {
+		pk, sk := item.PKSK(rs.TableInfo)
+		if _, hasItem := itemsInI[pksk{pk, sk}]; !hasItem {
+			newItems = append(newItems, item)
+		}
+	}
+
+	newResultSet := &ResultSet{
+		Created:   time.Now(),
+		TableInfo: rs.TableInfo,
+	}
+	newResultSet.SetItems(newItems)
+
+	return newResultSet
+}

internal/dynamo-browse/models/queryexpr/types.go

@@ -8,6 +8,7 @@ import (
 	"github.com/pkg/errors"
 	"math/big"
 	"strconv"
+	"strings"
 )
 
 type exprValue interface {
@@ -62,6 +63,14 @@ func newExprValueFromAttributeValue(ev types.AttributeValue) (exprValue, error)
 	case *types.AttributeValueMemberS:
 		return stringExprValue(xVal.Value), nil
 	case *types.AttributeValueMemberN:
+		if !strings.Contains(xVal.Value, ".") {
+			iVal, err := strconv.ParseInt(xVal.Value, 10, 64)
+			if err != nil {
+				return nil, err
+			}
+			return int64ExprValue(iVal), nil
+		}
+
 		xNumVal, _, err := big.ParseFloat(xVal.Value, 10, 63, big.ToNearestEven)
 		if err != nil {
 			return nil, err
@@ -139,6 +148,32 @@ func (s int64ExprValue) typeName() string {
 	return "N"
 }
 
+type bigIntExprValue struct {
+	num *big.Int
+}
+
+func (i bigIntExprValue) asGoValue() any {
+	return i.num
+}
+
+func (i bigIntExprValue) asAttributeValue() types.AttributeValue {
+	return &types.AttributeValueMemberN{Value: i.num.String()}
+}
+
+func (i bigIntExprValue) asInt() int64 {
+	return i.num.Int64()
+}
+
+func (i bigIntExprValue) asBigFloat() *big.Float {
+	var f big.Float
+	f.SetInt64(i.num.Int64())
+	return &f
+}
+
+func (s bigIntExprValue) typeName() string {
+	return "N"
+}
+
 type bigNumExprValue struct {
 	num *big.Float
 }

internal/dynamo-browse/ui/model.go

@@ -1,16 +1,11 @@
 package ui
 
 import (
-	"log"
-	"os"
-	"ucl.lmika.dev/ucl"
-
 	"github.com/charmbracelet/bubbles/key"
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/lmika/dynamo-browse/internal/common/ui/commandctrl"
 	"github.com/lmika/dynamo-browse/internal/common/ui/events"
 	"github.com/lmika/dynamo-browse/internal/dynamo-browse/controllers"
-	"github.com/lmika/dynamo-browse/internal/dynamo-browse/models"
 	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services"
 	"github.com/lmika/dynamo-browse/internal/dynamo-browse/services/itemrenderer"
 	"github.com/lmika/dynamo-browse/internal/dynamo-browse/ui/keybindings"
@@ -26,7 +21,7 @@ import (
 	"github.com/lmika/dynamo-browse/internal/dynamo-browse/ui/teamodels/tableselect"
 	"github.com/lmika/dynamo-browse/internal/dynamo-browse/ui/teamodels/utils"
 	bus "github.com/lmika/events"
-	"github.com/pkg/errors"
+	"log"
 )
 
 const (
@@ -37,8 +32,6 @@ const (
 	ViewModeTableOnly      = 4
 
 	ViewModeCount = 5
-
-	initRCFilename = "$HOME/.config/audax/dynamo-browse/init.rc"
 )
 
 type Model struct {
@@ -47,7 +40,7 @@ type Model struct {
 	settingsController   *controllers.SettingsController
 	exportController     *controllers.ExportController
 	commandController    *commandctrl.CommandController
-	scriptController     *controllers.ScriptController
+	//scriptController     *controllers.ScriptController
 	jobController   *controllers.JobsController
 	colSelector     *colselector.Model
 	relSelector     *relselector.Model
@@ -75,7 +68,7 @@ func NewModel(
 	jobController *controllers.JobsController,
 	itemRendererService *itemrenderer.Service,
 	cc *commandctrl.CommandController,
-	scriptController *controllers.ScriptController,
+	//scriptController *controllers.ScriptController,
 	eventBus *bus.Bus,
 	keyBindingController *controllers.KeyBindingController,
 	pasteboardProvider services.PasteboardProvider,
@@ -94,6 +87,7 @@ func NewModel(
 	dialogPrompt := dialogprompt.New(statusAndPrompt)
 	tableSelect := tableselect.New(dialogPrompt, uiStyles)
 
+	/*
 		cc.AddCommands(&commandctrl.CommandList{
 			Commands: map[string]commandctrl.Command{
 				"quit": commandctrl.NoArgCommand(tea.Quit),
@@ -170,8 +164,6 @@ func NewModel(
 						itemType = models.NullItemType
 					case args.HasSwitch("TO"):
 						itemType = models.ExprValueItemType
-				default:
-					return events.Error(errors.New("unrecognised item type"))
 					}
 
 					return wc.SetAttributeValue(dtv.SelectedItemIndex(), itemType, fieldName)
@@ -196,7 +188,7 @@ func NewModel(
 					return wc.NoisyTouchItem(dtv.SelectedItemIndex())
 				},
 
-			/*
+
 					"echo": func(ctx commandctrl.ExecContext, args ucl.CallArgs) tea.Msg {
 						s := new(strings.Builder)
 						for _, arg := range args {
@@ -204,7 +196,6 @@ func NewModel(
 						}
 						return events.StatusMsg(s.String())
 					},
-			*/
 				"set-opt": func(ctx commandctrl.ExecContext, args ucl.CallArgs) tea.Msg {
 					var name string
 					if err := args.Bind(&name); err != nil {
@@ -253,13 +244,16 @@ func NewModel(
 			},
 		})
 
+	*/
+
 	root := layout.FullScreen(tableSelect)
 
 	return Model{
 		tableReadController:  rc,
 		tableWriteController: wc,
 		commandController:    cc,
-		scriptController:     scriptController,
+		//scriptController:     scriptController,
+		exportController:     exportController,
 		jobController:        jobController,
 		itemEdit:             itemEdit,
 		colSelector:          colSelector,
@@ -280,10 +274,10 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case controllers.SetTableItemView:
 		cmd := m.setMainViewIndex(msg.ViewIndex)
 		return m, cmd
-	case controllers.ResultSetUpdated:
+	case events.ResultSetUpdated:
 		return m, tea.Batch(
 			m.tableView.Refresh(),
-			events.SetStatus(msg.StatusMessage()),
+			events.SetStatus(msg.StatusMessage),
 		)
 	case tea.KeyMsg:
 		// TODO: use modes here
@@ -306,7 +300,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			case key.Matches(msg, m.keyMap.PromptForQuery):
 				return m, m.tableReadController.PromptForQuery
 			case key.Matches(msg, m.keyMap.PromptForFilter):
-				return m, m.tableReadController.Filter
+				return m, m.tableReadController.PromptForFilter
 			case key.Matches(msg, m.keyMap.FetchNextPage):
 				return m, m.tableReadController.NextPage
 			case key.Matches(msg, m.keyMap.ViewBack):
@@ -322,10 +316,10 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			//	return m, nil
 			case key.Matches(msg, m.keyMap.ShowColumnOverlay):
 				return m, events.SetTeaMessage(controllers.ShowColumnOverlay{})
-			case key.Matches(msg, m.keyMap.ShowRelItemsOverlay):
+			//case key.Matches(msg, m.keyMap.ShowRelItemsOverlay):
-				if idx := m.tableView.SelectedItemIndex(); idx >= 0 {
+			//	if idx := m.tableView.SelectedItemIndex(); idx >= 0 {
-					return m, events.SetTeaMessage(m.scriptController.LookupRelatedItems(idx))
+			//		return m, events.SetTeaMessage(m.scriptController.LookupRelatedItems(idx))
-				}
+			//	}
 			case key.Matches(msg, m.keyMap.PromptForCommand):
 				return m, m.commandController.Prompt
 			case key.Matches(msg, m.keyMap.PromptForTable):
@@ -348,12 +342,6 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 }
 
 func (m Model) Init() tea.Cmd {
-	// TODO: this should probably be moved somewhere else
-	rcFilename := os.ExpandEnv(initRCFilename)
-	if err := m.commandController.ExecuteFile(rcFilename); err != nil {
-		log.Println(err)
-	}
-
 	return tea.Batch(
 		m.tableReadController.Init,
 		m.root.Init(),
@@ -397,3 +385,11 @@ func (m *Model) promptToQuit() tea.Msg {
 		return nil
 	})
 }
+
+func (m *Model) SelectedItemIndex() int {
+	return m.tableView.SelectedItemIndex()
+}
+
+func (m *Model) SetSelectedItemIndex(newIdx int) tea.Msg {
+	return m.tableView.SetSelectedItemIndex(newIdx)
+}

internal/dynamo-browse/ui/teamodels/dynamotableview/model.go

@@ -208,6 +208,27 @@ func (m *Model) SelectedItemIndex() int {
 	return selectedItem.itemIndex
 }
 
+func (m *Model) SetSelectedItemIndex(newIdx int) tea.Msg {
+	cursor := m.table.Cursor()
+	switch {
+	case newIdx <= 0:
+		m.table.GoTop()
+	case newIdx >= len(m.rows)-1:
+		m.table.GoBottom()
+	case newIdx < cursor:
+		delta := cursor - newIdx
+		for d := 0; d < delta; d++ {
+			m.table.GoUp()
+		}
+	case newIdx > cursor:
+		delta := newIdx - cursor
+		for d := 0; d < delta; d++ {
+			m.table.GoDown()
+		}
+	}
+	return m.postSelectedItemChanged()
+}
+
 func (m *Model) selectedItem() (itemTableRow, bool) {
 	resultSet := m.resultSet
 

test/testdynamo/client.go

@@ -2,6 +2,7 @@ package testdynamo
 
 import (
 	"context"
+	"os"
 	"testing"
 
 	"github.com/aws/aws-sdk-go-v2/aws"
@@ -28,8 +29,13 @@ func SetupTestTable(t *testing.T, testData []TestData) *dynamodb.Client {
 		config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider("abc", "123", "")))
 	assert.NoError(t, err)
 
+	testDynamoURL, ok := os.LookupEnv("TEST_DYNAMO_URL")
+	if !ok {
+		testDynamoURL = "http://localhost:4566"
+	}
+
 	dynamoClient := dynamodb.NewFromConfig(cfg,
-		dynamodb.WithEndpointResolver(dynamodb.EndpointResolverFromURL("http://localhost:4566")))
+		dynamodb.WithEndpointResolver(dynamodb.EndpointResolverFromURL(testDynamoURL)))
 
 	for _, table := range testData {
 		tableInput := &dynamodb.CreateTableInput{