add ability to use editing modes

README.md

@@ -63,16 +63,21 @@ go run main.go sample.db
 - `q` or `Ctrl+C`: Quit
 
 ### Cell Edit Mode
-- Type new value for the selected cell
+- **Readline-style Editing**: Full cursor control and advanced editing
+- **Cursor Movement**: `←/→` arrows, `Ctrl+←/→` for word navigation
+- **Line Navigation**: `Home`/`Ctrl+A` (start), `End`/`Ctrl+E` (end)
+- **Deletion**: `Backspace`, `Delete`/`Ctrl+D`, `Ctrl+W` (word), `Ctrl+K` (to end), `Ctrl+U` (to start)
 - **Text Wrapping**: Long values are automatically wrapped for better visibility
 - `Enter`: Save changes to database
 - `Esc`: Cancel editing and return to row detail
-- `Backspace`: Delete characters
 
 ### SQL Query Mode
-- Type your SQL query (all keys including r, s, h, j, k, l work as input)
+- **Advanced Text Editing**: Full readline-style editing controls
+- **Cursor Movement**: `←/→` arrows, `Ctrl+←/→` for word navigation  
+- **Line Navigation**: `Home`/`Ctrl+A` (start), `End`/`Ctrl+E` (end)
+- **Deletion**: `Backspace`, `Delete`/`Ctrl+D`, `Ctrl+W` (word), `Ctrl+K` (to end), `Ctrl+U` (to start)
+- Type your SQL query (all keys work as input, no conflicts with navigation)
 - `Enter`: Execute query
-- `Backspace`: Delete characters
 - `Esc`: Return to table list
 - `q` or `Ctrl+C`: Quit
 
@@ -85,15 +90,16 @@ go run main.go sample.db
 5. **Data Search**: Search within table data across all columns
 6. **Row Detail Modal**: 2-column view showing Column | Value for selected row
 7. **Cell Editing**: Live editing of individual cell values with database updates
-8. **Text Wrapping**: Long values are automatically wrapped in edit and detail views
-9. **Primary Key Detection**: Uses primary keys for reliable row updates
-10. **Screen-Aware Display**: Content automatically fits terminal size
-11. **SQL Query Execution**: Execute custom SQL queries and view results (all keys work as input)
-12. **Error Handling**: Displays database errors gracefully
-13. **Responsive UI**: Clean, styled interface that adapts to terminal size
-14. **Column Information**: Shows column names and handles NULL values
-15. **Navigation**: Intuitive keyboard shortcuts for all operations
-16. **Dynamic Column Width**: Columns adjust to terminal width
+8. **Readline-style Editing**: Full cursor control with word navigation, line navigation, and advanced deletion
+9. **Text Wrapping**: Long values are automatically wrapped in edit and detail views
+10. **Primary Key Detection**: Uses primary keys for reliable row updates
+11. **Screen-Aware Display**: Content automatically fits terminal size
+12. **SQL Query Execution**: Execute custom SQL queries with advanced text editing
+13. **Error Handling**: Displays database errors gracefully
+14. **Responsive UI**: Clean, styled interface that adapts to terminal size
+15. **Column Information**: Shows column names and handles NULL values
+16. **Navigation**: Intuitive keyboard shortcuts for all operations
+17. **Dynamic Column Width**: Columns adjust to terminal width
 
 ## Navigation Flow
 

edit_cell.go

@@ -14,6 +14,7 @@ type editCellModel struct {
 	colIndex      int
 	editingValue  string
 	originalValue string
+	cursorPos     int
 }
 
 func newEditCellModel(shared *sharedData, rowIndex, colIndex int) *editCellModel {
@@ -28,6 +29,7 @@ func newEditCellModel(shared *sharedData, rowIndex, colIndex int) *editCellModel
 		colIndex:      colIndex,
 		editingValue:  originalValue,
 		originalValue: originalValue,
+		cursorPos:     len(originalValue), // Start cursor at end
 	}
 }
 
@@ -59,19 +61,104 @@ func (m *editCellModel) handleInput(msg tea.KeyMsg) (subModel, tea.Cmd) {
 			}
 		}
 
-	case "backspace":
-		if len(m.editingValue) > 0 {
-			m.editingValue = m.editingValue[:len(m.editingValue)-1]
+	// Cursor movement
+	case "left":
+		if m.cursorPos > 0 {
+			m.cursorPos--
 		}
 
+	case "right":
+		if m.cursorPos < len(m.editingValue) {
+			m.cursorPos++
+		}
+
+	case "ctrl+left":
+		m.cursorPos = m.wordLeft(m.cursorPos)
+
+	case "ctrl+right":
+		m.cursorPos = m.wordRight(m.cursorPos)
+
+	case "home", "ctrl+a":
+		m.cursorPos = 0
+
+	case "end", "ctrl+e":
+		m.cursorPos = len(m.editingValue)
+
+	// Deletion
+	case "backspace":
+		if m.cursorPos > 0 {
+			m.editingValue = m.editingValue[:m.cursorPos-1] + m.editingValue[m.cursorPos:]
+			m.cursorPos--
+		}
+
+	case "delete", "ctrl+d":
+		if m.cursorPos < len(m.editingValue) {
+			m.editingValue = m.editingValue[:m.cursorPos] + m.editingValue[m.cursorPos+1:]
+		}
+
+	case "ctrl+w":
+		// Delete word backward
+		newPos := m.wordLeft(m.cursorPos)
+		m.editingValue = m.editingValue[:newPos] + m.editingValue[m.cursorPos:]
+		m.cursorPos = newPos
+
+	case "ctrl+k":
+		// Delete from cursor to end of line
+		m.editingValue = m.editingValue[:m.cursorPos]
+
+	case "ctrl+u":
+		// Delete from beginning of line to cursor
+		m.editingValue = m.editingValue[m.cursorPos:]
+		m.cursorPos = 0
+
 	default:
+		// Insert character at cursor position
 		if len(msg.String()) == 1 {
-			m.editingValue += msg.String()
+			m.editingValue = m.editingValue[:m.cursorPos] + msg.String() + m.editingValue[m.cursorPos:]
+			m.cursorPos++
 		}
 	}
 	return m, nil
 }
 
+// Helper functions for word navigation (same as query model)
+func (m *editCellModel) wordLeft(pos int) int {
+	if pos == 0 {
+		return 0
+	}
+	
+	// Skip whitespace
+	for pos > 0 && isWhitespace(m.editingValue[pos-1]) {
+		pos--
+	}
+	
+	// Skip non-whitespace
+	for pos > 0 && !isWhitespace(m.editingValue[pos-1]) {
+		pos--
+	}
+	
+	return pos
+}
+
+func (m *editCellModel) wordRight(pos int) int {
+	length := len(m.editingValue)
+	if pos >= length {
+		return length
+	}
+	
+	// Skip non-whitespace
+	for pos < length && !isWhitespace(m.editingValue[pos]) {
+		pos++
+	}
+	
+	// Skip whitespace
+	for pos < length && isWhitespace(m.editingValue[pos]) {
+		pos++
+	}
+	
+	return pos
+}
+
 func (m *editCellModel) View() string {
 	var content strings.Builder
 
@@ -98,17 +185,28 @@ func (m *editCellModel) View() string {
 	
 	content.WriteString("\n")
 	
-	// Wrap new value
+	// Wrap new value with cursor
 	content.WriteString("New:")
 	content.WriteString("\n")
-	newLines := wrapText(m.editingValue+"_", textWidth) // Add cursor
+	
+	// Display editing value with cursor
+	valueWithCursor := ""
+	if m.cursorPos <= len(m.editingValue) {
+		before := m.editingValue[:m.cursorPos]
+		after := m.editingValue[m.cursorPos:]
+		valueWithCursor = before + "█" + after
+	} else {
+		valueWithCursor = m.editingValue + "█"
+	}
+	
+	newLines := wrapText(valueWithCursor, textWidth)
 	for _, line := range newLines {
 		content.WriteString("  " + line)
 		content.WriteString("\n")
 	}
 	
 	content.WriteString("\n")
-	content.WriteString(helpStyle.Render("Type new value • enter: save • esc: cancel"))
+	content.WriteString(helpStyle.Render("←/→: move cursor • ctrl+←/→: word nav • home/end: line nav • ctrl+w/k/u: delete • enter: save • esc: cancel"))
 
 	return content.String()
 }

query.go

@@ -9,10 +9,11 @@ import (
 
 // Query Model
 type queryModel struct {
-	shared     *sharedData
-	queryInput string
-	results    [][]string
-	columns    []string
+	shared      *sharedData
+	queryInput  string
+	cursorPos   int
+	results     [][]string
+	columns     []string
 }
 
 func newQueryModel(shared *sharedData) *queryModel {
@@ -43,20 +44,108 @@ func (m *queryModel) handleInput(msg tea.KeyMsg) (subModel, tea.Cmd) {
 			// Handle error - could set an error field
 		}
 
-	case "backspace":
-		if len(m.queryInput) > 0 {
-			m.queryInput = m.queryInput[:len(m.queryInput)-1]
+	// Cursor movement
+	case "left":
+		if m.cursorPos > 0 {
+			m.cursorPos--
 		}
 
+	case "right":
+		if m.cursorPos < len(m.queryInput) {
+			m.cursorPos++
+		}
+
+	case "ctrl+left":
+		m.cursorPos = m.wordLeft(m.cursorPos)
+
+	case "ctrl+right":
+		m.cursorPos = m.wordRight(m.cursorPos)
+
+	case "home", "ctrl+a":
+		m.cursorPos = 0
+
+	case "end", "ctrl+e":
+		m.cursorPos = len(m.queryInput)
+
+	// Deletion
+	case "backspace":
+		if m.cursorPos > 0 {
+			m.queryInput = m.queryInput[:m.cursorPos-1] + m.queryInput[m.cursorPos:]
+			m.cursorPos--
+		}
+
+	case "delete", "ctrl+d":
+		if m.cursorPos < len(m.queryInput) {
+			m.queryInput = m.queryInput[:m.cursorPos] + m.queryInput[m.cursorPos+1:]
+		}
+
+	case "ctrl+w":
+		// Delete word backward
+		newPos := m.wordLeft(m.cursorPos)
+		m.queryInput = m.queryInput[:newPos] + m.queryInput[m.cursorPos:]
+		m.cursorPos = newPos
+
+	case "ctrl+k":
+		// Delete from cursor to end of line
+		m.queryInput = m.queryInput[:m.cursorPos]
+
+	case "ctrl+u":
+		// Delete from beginning of line to cursor
+		m.queryInput = m.queryInput[m.cursorPos:]
+		m.cursorPos = 0
+
 	default:
-		// In query mode, all single characters should be treated as input
+		// Insert character at cursor position
 		if len(msg.String()) == 1 {
-			m.queryInput += msg.String()
+			m.queryInput = m.queryInput[:m.cursorPos] + msg.String() + m.queryInput[m.cursorPos:]
+			m.cursorPos++
 		}
 	}
 	return m, nil
 }
 
+// Helper functions for word navigation
+func (m *queryModel) wordLeft(pos int) int {
+	if pos == 0 {
+		return 0
+	}
+	
+	// Skip whitespace
+	for pos > 0 && isWhitespace(m.queryInput[pos-1]) {
+		pos--
+	}
+	
+	// Skip non-whitespace
+	for pos > 0 && !isWhitespace(m.queryInput[pos-1]) {
+		pos--
+	}
+	
+	return pos
+}
+
+func (m *queryModel) wordRight(pos int) int {
+	length := len(m.queryInput)
+	if pos >= length {
+		return length
+	}
+	
+	// Skip non-whitespace
+	for pos < length && !isWhitespace(m.queryInput[pos]) {
+		pos++
+	}
+	
+	// Skip whitespace
+	for pos < length && isWhitespace(m.queryInput[pos]) {
+		pos++
+	}
+	
+	return pos
+}
+
+func isWhitespace(r byte) bool {
+	return r == ' ' || r == '\t' || r == '\n' || r == '\r'
+}
+
 func (m *queryModel) executeQuery() error {
 	if strings.TrimSpace(m.queryInput) == "" {
 		return nil
@@ -113,9 +202,18 @@ func (m *queryModel) View() string {
 	content.WriteString(titleStyle.Render("SQL Query"))
 	content.WriteString("\n\n")
 	
+	// Display query with cursor
 	content.WriteString("Query: ")
-	content.WriteString(m.queryInput)
-	content.WriteString("_") // cursor
+	if m.cursorPos <= len(m.queryInput) {
+		before := m.queryInput[:m.cursorPos]
+		after := m.queryInput[m.cursorPos:]
+		content.WriteString(before)
+		content.WriteString("█") // Block cursor
+		content.WriteString(after)
+	} else {
+		content.WriteString(m.queryInput)
+		content.WriteString("█")
+	}
 	content.WriteString("\n\n")
 
 	if len(m.results) > 0 {
@@ -169,7 +267,7 @@ func (m *queryModel) View() string {
 	}
 
 	content.WriteString("\n")
-	content.WriteString(helpStyle.Render("enter: execute query • esc: back • q: quit"))
+	content.WriteString(helpStyle.Render("enter: execute • ←/→: move cursor • ctrl+←/→: word nav • home/end: line nav • ctrl+w/k/u: delete • esc: back"))
 
 	return content.String()
 }