Support emoji input for custom text

src/widgets/CustomText.tsx

@@ -49,43 +49,121 @@ const CustomTextEditor: React.FC<WidgetEditorProps> = ({ widget, onComplete, onC
     const [text, setText] = useState(widget.customText ?? '');
     const [cursorPos, setCursorPos] = useState(text.length);
 
+    // Helper to get grapheme segments if Intl.Segmenter is available
+    const getGraphemes = (str: string): string[] => {
+        if ('Segmenter' in Intl) {
+            const segmenter = new Intl.Segmenter(undefined, { granularity: 'grapheme' });
+            return Array.from(segmenter.segment(str), seg => seg.segment);
+        }
+        // Fallback to simple character array (won't handle complex emojis perfectly)
+        return Array.from(str);
+    };
+
+    // Convert between grapheme index and string index
+    const graphemeToStringIndex = (str: string, graphemeIndex: number): number => {
+        const graphemes = getGraphemes(str);
+        let stringIndex = 0;
+        for (let i = 0; i < Math.min(graphemeIndex, graphemes.length); i++) {
+            const grapheme = graphemes[i];
+            if (grapheme) {
+                stringIndex += grapheme.length;
+            }
+        }
+        return stringIndex;
+    };
+
+    const stringToGraphemeIndex = (str: string, stringIndex: number): number => {
+        const graphemes = getGraphemes(str);
+        let currentStringIndex = 0;
+        for (let i = 0; i < graphemes.length; i++) {
+            if (currentStringIndex >= stringIndex)
+                return i;
+            const grapheme = graphemes[i];
+            if (grapheme) {
+                currentStringIndex += grapheme.length;
+            }
+        }
+        return graphemes.length;
+    };
+
     useInput((input, key) => {
         if (key.return) {
             onComplete({ ...widget, customText: text });
         } else if (key.escape) {
             onCancel();
         } else if (key.leftArrow) {
-            setCursorPos(Math.max(0, cursorPos - 1));
+            const currentGraphemeIndex = stringToGraphemeIndex(text, cursorPos);
+            if (currentGraphemeIndex > 0) {
+                const newStringIndex = graphemeToStringIndex(text, currentGraphemeIndex - 1);
+                setCursorPos(newStringIndex);
+            }
         } else if (key.rightArrow) {
-            setCursorPos(Math.min(text.length, cursorPos + 1));
+            const currentGraphemeIndex = stringToGraphemeIndex(text, cursorPos);
+            const graphemeCount = getGraphemes(text).length;
+            if (currentGraphemeIndex < graphemeCount) {
+                const newStringIndex = graphemeToStringIndex(text, currentGraphemeIndex + 1);
+                setCursorPos(newStringIndex);
+            }
         } else if (key.ctrl && input === 'ArrowLeft') {
             setCursorPos(0);
         } else if (key.ctrl && input === 'ArrowRight') {
             setCursorPos(text.length);
         } else if (key.backspace) {
             if (cursorPos > 0) {
-                setText(text.slice(0, cursorPos - 1) + text.slice(cursorPos));
-                setCursorPos(cursorPos - 1);
+                const currentGraphemeIndex = stringToGraphemeIndex(text, cursorPos);
+                if (currentGraphemeIndex > 0) {
+                    const deleteFromIndex = graphemeToStringIndex(text, currentGraphemeIndex - 1);
+                    const deleteToIndex = graphemeToStringIndex(text, currentGraphemeIndex);
+                    setText(text.slice(0, deleteFromIndex) + text.slice(deleteToIndex));
+                    setCursorPos(deleteFromIndex);
+                }
             }
         } else if (key.delete) {
             if (cursorPos < text.length) {
-                setText(text.slice(0, cursorPos) + text.slice(cursorPos + 1));
+                const currentGraphemeIndex = stringToGraphemeIndex(text, cursorPos);
+                const graphemeCount = getGraphemes(text).length;
+                if (currentGraphemeIndex < graphemeCount) {
+                    const deleteFromIndex = graphemeToStringIndex(text, currentGraphemeIndex);
+                    const deleteToIndex = graphemeToStringIndex(text, currentGraphemeIndex + 1);
+                    setText(text.slice(0, deleteFromIndex) + text.slice(deleteToIndex));
+                }
             }
-        } else if (input && input.length === 1) {
-            setText(text.slice(0, cursorPos) + input + text.slice(cursorPos));
-            setCursorPos(cursorPos + 1);
+        } else if (input && !key.ctrl && !key.meta) {
+            // Insert the input at cursor position
+            const newText = text.slice(0, cursorPos) + input + text.slice(cursorPos);
+            setText(newText);
+
+            // Move cursor by the actual string length of the input
+            // This handles multi-byte characters including emojis with modifiers
+            setCursorPos(cursorPos + input.length);
         }
     });
 
+    // Get the grapheme at cursor position for display
+    const graphemes = getGraphemes(text);
+    const currentGraphemeIndex = stringToGraphemeIndex(text, cursorPos);
+
+    // Build display with ANSI codes for cursor highlighting
+    let display = 'Enter custom text: ';
+    for (let i = 0; i < graphemes.length; i++) {
+        const grapheme = graphemes[i];
+        if (grapheme) {
+            if (i === currentGraphemeIndex) {
+                // Use inverse video for cursor position
+                display += `\x1b[7m${grapheme}\x1b[0m`;
+            } else {
+                display += grapheme;
+            }
+        }
+    }
+    if (currentGraphemeIndex >= graphemes.length) {
+        // Cursor at end
+        display += '\x1b[7m \x1b[0m';
+    }
+
     return (
         <Box flexDirection='column'>
-            <Text>
-                Enter custom text:
-                {' '}
-                {text.slice(0, cursorPos)}
-                <Text backgroundColor='gray' color='black'>{text[cursorPos] ?? ' '}</Text>
-                {text.slice(cursorPos + 1)}
-            </Text>
+            <Text>{display}</Text>
             <Text dimColor>←→ move cursor, Ctrl+←→ jump to start/end, Enter save, ESC cancel</Text>
         </Box>
     );