Added some colours

internal/dynamo-browse/models/itemrender/coll.go

@@ -13,6 +13,10 @@ func (sr *ListRenderer) TypeName() string {
 }
 
 func (sr *ListRenderer) StringValue() string {
+	return ""
+}
+
+func (sr *ListRenderer) MetaInfo() string {
 	if len(sr.Value) == 1 {
 		return fmt.Sprintf("(1 item)")
 	}
@@ -34,6 +38,10 @@ func (sr *MapRenderer) TypeName() string {
 }
 
 func (sr *MapRenderer) StringValue() string {
+	return ""
+}
+
+func (sr *MapRenderer) MetaInfo() string {
 	if len(sr.Value) == 1 {
 		return fmt.Sprintf("(1 item)")
 	}

internal/dynamo-browse/models/itemrender/itemdisp.go

@@ -5,6 +5,7 @@ import "github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
 type Renderer interface {
 	TypeName() string
 	StringValue() string
+	MetaInfo() string
 	SubItems() []SubItem
 }
 

internal/dynamo-browse/models/itemrender/nils.go

@@ -3,11 +3,15 @@ package itemrender
 type OtherRenderer struct{}
 
 func (u OtherRenderer) TypeName() string {
-	return "(other)"
+	return "??"
 }
 
-func (u OtherRenderer) StringValue() string {
+func (sr OtherRenderer) StringValue() string {
-	return "(other)"
+	return ""
+}
+
+func (u OtherRenderer) MetaInfo() string {
+	return "(unrecognised)"
 }
 
 func (u OtherRenderer) SubItems() []SubItem {

internal/dynamo-browse/models/itemrender/scalars.go

@@ -1,7 +1,6 @@
 package itemrender
 
 import (
-	"fmt"
 	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
 )
 
@@ -15,6 +14,10 @@ func (sr *StringRenderer) StringValue() string {
 	return sr.Value
 }
 
+func (sr *StringRenderer) MetaInfo() string {
+	return ""
+}
+
 func (sr *StringRenderer) SubItems() []SubItem {
 	return nil
 }
@@ -29,6 +32,10 @@ func (sr *NumberRenderer) StringValue() string {
 	return sr.Value
 }
 
+func (sr *NumberRenderer) MetaInfo() string {
+	return ""
+}
+
 func (sr *NumberRenderer) SubItems() []SubItem {
 	return nil
 }
@@ -46,6 +53,10 @@ func (sr *BoolRenderer) StringValue() string {
 	return "False"
 }
 
+func (sr *BoolRenderer) MetaInfo() string {
+	return ""
+}
+
 func (sr *BoolRenderer) SubItems() []SubItem {
 	return nil
 }
@@ -57,10 +68,11 @@ func (sr *BinaryRenderer) TypeName() string {
 }
 
 func (sr *BinaryRenderer) StringValue() string {
-	if len(sr.Value) == 1 {
+	return ""
-		return fmt.Sprintf("(1 byte)")
+}
-	}
+
-	return fmt.Sprintf("(%d bytes)", len(sr.Value))
+func (sr *BinaryRenderer) MetaInfo() string {
+	return cardinality(len(sr.Value), "byte", "bytes")
 }
 
 func (sr *BinaryRenderer) SubItems() []SubItem {
@@ -73,6 +85,10 @@ func (sr *NullRenderer) TypeName() string {
 	return "NULL"
 }
 
+func (sr *NullRenderer) MetaInfo() string {
+	return ""
+}
+
 func (sr *NullRenderer) StringValue() string {
 	return "null"
 }

internal/dynamo-browse/models/itemrender/sets.go

@@ -15,6 +15,10 @@ func (sr *GenericRenderer) TypeName() string {
 }
 
 func (sr *GenericRenderer) StringValue() string {
+	return ""
+}
+
+func (sr *GenericRenderer) MetaInfo() string {
 	return cardinality(len(sr.subitemValue), "item", "items")
 }
 

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

@@ -17,9 +17,14 @@ import (
 
 var (
 	activeHeaderStyle = lipgloss.NewStyle().
-		Bold(true).
+				Bold(true).
-		Foreground(lipgloss.Color("#ffffff")).
+				Foreground(lipgloss.Color("#ffffff")).
-		Background(lipgloss.Color("#4479ff"))
+				Background(lipgloss.Color("#4479ff"))
+
+	fieldTypeStyle = lipgloss.NewStyle().
+			Foreground(lipgloss.Color("#31e131"))
+	metaInfoStyle = lipgloss.NewStyle().
+			Foreground(lipgloss.Color("#888888"))
 )
 
 type Model struct {
@@ -96,7 +101,8 @@ func (m *Model) updateViewportToSelectedMessage() {
 }
 
 func (m *Model) renderItem(w io.Writer, prefix string, name string, r itemrender.Renderer) {
-	fmt.Fprintf(w, "%s%v\t%s\t%s\n", prefix, name, r.TypeName(), r.StringValue())
+	fmt.Fprintf(w, "%s%v\t%s\t%s%s\n",
+		prefix, name, fieldTypeStyle.Render(r.TypeName()), r.StringValue(), metaInfoStyle.Render(r.MetaInfo()))
 	if subitems := r.SubItems(); len(subitems) > 0 {
 		for _, si := range subitems {
 			m.renderItem(w, prefix+"  ", si.Key, si.Value)

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

@@ -24,6 +24,7 @@ type Model struct {
 	w, h       int
 
 	// model state
+	colOffset int
 	rows      []table.Row
 	resultSet *models.ResultSet
 }
@@ -60,6 +61,12 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		case "k", "down":
 			m.table.GoDown()
 			return m, m.postSelectedItemChanged
+		case "j":
+			m.setLeftmostDisplayedColumn(m.colOffset - 1)
+			return m, nil
+		case "l":
+			m.setLeftmostDisplayedColumn(m.colOffset + 1)
+			return m, nil
 		case "I", "pgup":
 			m.table.GoPageUp()
 			return m, m.postSelectedItemChanged
@@ -72,6 +79,17 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	return m, nil
 }
 
+func (m *Model) setLeftmostDisplayedColumn(newCol int) {
+	if newCol < 0 {
+		m.colOffset = 0
+	} else if newCol >= len(m.resultSet.Columns) {
+		m.colOffset = len(m.resultSet.Columns) - 1
+	} else {
+		m.colOffset = newCol
+	}
+	m.rebuildTable()
+}
+
 func (m *Model) View() string {
 	return lipgloss.JoinVertical(lipgloss.Top, m.frameTitle.View(), m.table.View())
 }
@@ -85,23 +103,39 @@ func (m *Model) Resize(w, h int) layout.ResizingModel {
 }
 
 func (m *Model) updateTable() {
+	m.colOffset = 0
+
+	m.frameTitle.SetTitle("Table: " + m.resultSet.TableInfo.Name)
+	m.rebuildTable()
+}
+
+func (m *Model) rebuildTable() {
 	resultSet := m.resultSet
 
-	m.frameTitle.SetTitle("Table: " + resultSet.TableInfo.Name)
+	newTbl := table.New(resultSet.Columns[m.colOffset:], m.w, m.h-m.frameTitle.HeaderHeight())
-
-	newTbl := table.New(resultSet.Columns, m.w, m.h-m.frameTitle.HeaderHeight())
 	newRows := make([]table.Row, 0)
 	for i, r := range resultSet.Items() {
 		if resultSet.Hidden(i) {
 			continue
 		}
 
-		newRows = append(newRows, itemTableRow{resultSet: resultSet, itemIndex: i, item: r})
+		newRows = append(newRows, itemTableRow{
+			resultSet: resultSet,
+			itemIndex: i,
+			colOffset: m.colOffset,
+			item:      r,
+		})
 	}
 
 	m.rows = newRows
 	newTbl.SetRows(newRows)
-
+	for newTbl.Cursor() != m.table.Cursor() {
+		if newTbl.Cursor() < m.table.Cursor() {
+			newTbl.GoDown()
+		} else if newTbl.Cursor() > m.table.Cursor() {
+			newTbl.GoUp()
+		}
+	}
 	m.table = newTbl
 }
 

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

@@ -17,11 +17,15 @@ var (
 			Foreground(lipgloss.Color("#e13131"))
 	newRowStyle = lipgloss.NewStyle().
 			Foreground(lipgloss.Color("#31e131"))
+
+	metaInfoStyle = lipgloss.NewStyle().
+			Foreground(lipgloss.Color("#888888"))
 )
 
 type itemTableRow struct {
 	resultSet *models.ResultSet
 	itemIndex int
+	colOffset int
 	item      models.Item
 }
 
@@ -30,17 +34,6 @@ func (mtr itemTableRow) Render(w io.Writer, model table.Model, index int) {
 	isDirty := mtr.resultSet.IsDirty(mtr.itemIndex)
 	isNew := mtr.resultSet.IsNew(mtr.itemIndex)
 
-	sb := strings.Builder{}
-	for i, colName := range mtr.resultSet.Columns {
-		if i > 0 {
-			sb.WriteString("\t")
-		}
-
-		if r := mtr.item.Renderer(colName); r != nil {
-			sb.WriteString(r.StringValue())
-		}
-	}
-
 	var style lipgloss.Style
 
 	if index == model.Cursor() {
@@ -54,6 +47,21 @@ func (mtr itemTableRow) Render(w io.Writer, model table.Model, index int) {
 	} else if isDirty {
 		style = style.Copy().Inherit(dirtyRowStyle)
 	}
+	metaInfoStyle := style.Copy().Inherit(metaInfoStyle)
 
-	fmt.Fprintln(w, style.Render(sb.String()))
+	sb := strings.Builder{}
+	for i, colName := range mtr.resultSet.Columns[mtr.colOffset:] {
+		if i > 0 {
+			sb.WriteString(style.Render("\t"))
+		}
+
+		if r := mtr.item.Renderer(colName); r != nil {
+			sb.WriteString(style.Render(r.StringValue()))
+			if mi := r.MetaInfo(); mi != "" {
+				sb.WriteString(metaInfoStyle.Render(mi))
+			}
+		}
+	}
+
+	fmt.Fprintln(w, sb.String())
 }