Improved paste handling to support selection and providing undo support

src/snek/templates/web.html

@@ -38,7 +38,6 @@
 {% include "dialog_online.html" %}
 <script type="module">
     import {app} from "/app.js";
-import { Schedule } from "/schedule.js";
 
     // --- Cache selectors ---
 const chatInputField = document.querySelector("chat-input");
@@ -99,50 +98,8 @@ setInterval(() => requestIdleCallback(updateTimes), 30000);
 
 // --- Paste & drag/drop uploads ---
 const textBox = chatInputField.textarea;
-textBox.addEventListener("paste", async (e) => {
-    try {
-        e.preventDefault();
-        const uploadButton = chatInputField.fileUploadGrid;
 
-        const clipboardItems = await navigator.clipboard.read()
+function uploadDataTransfer(dt) {
-
-        for (const item of clipboardItems) {
-            if (item.types.every(v => v === "text/plain")) {
-                const text = await (await item.getType("text/plain")).text();
-                chatInputField.value += text;
-                continue
-            }
-
-            if (item.types.every(t => t.startsWith('text/'))) {
-                console.log("All types are text:", item.types);
-                const codeType = item.types.find(t => !t.startsWith('text/plain') && !t.startsWith('text/html'));
-                let code = await(await item.getType(codeType ?? 'text/plain')).text();
-
-                const minIndentDepth = code.split('\n').reduce((acc, line) => {
-                    if (!line.trim()) return acc;
-                    const match = line.match(/^(\s*)/);
-                    return match ? Math.min(acc, match[1].length) : acc;
-                }, 9000)
-
-                code = code.split('\n').map(line => line.slice(minIndentDepth)).join('\n')
-
-                chatInputField.value += `\`\`\`${codeType?.split('/')?.[1] ?? ''}\n${code}\n\`\`\`\n`;
-            } else {
-                for (const type of item.types.filter(t => !t.startsWith('text/'))) {
-                    const blob = await item.getType(type);
-                    const name  = type.replace('/', '.')
-                    uploadButton.uploadsStarted++
-                    uploadButton.createTile(new File([blob], name, {type}))
-                }
-            }
-        }
-    } catch (error) {
-        console.error("Failed to read clipboard contents: ", error);
-    }
-});
-chatArea.addEventListener("drop", async (e) => {
-    e.preventDefault();
-    const dt = e.dataTransfer;
     if (dt.items.length > 0) {
         const uploadButton = chatInputField.fileUploadGrid;
 
@@ -152,10 +109,58 @@ chatArea.addEventListener("drop", async (e) => {
                 if (file) {
                    uploadButton.uploadsStarted++
                    uploadButton.createTile(file)
+                } else {
+                    console.error("Failed to get file from DataTransferItem");
                 }
             }
         }
     }
+}
+textBox.addEventListener("paste", async (e) => {
+    try {
+        console.log("Pasted data:", e.clipboardData);
+        if (e.clipboardData.types.every(v => v.startsWith("text/"))) {
+            const codeType = e.clipboardData.types.find(t => !t.startsWith('text/plain') && !t.startsWith('text/html') && !t.startsWith('text/rtf'));
+            const probablyCode = codeType ||e.clipboardData.types.some(t => !t.startsWith('text/plain'));
+            for (const item of e.clipboardData.items) {
+                if (item.kind === "string" && item.type === "text/plain") {
+                    e.preventDefault();
+                    item.getAsString(text => {
+                        const value = chatInputField.value;
+                        if (probablyCode) {
+                            let code = text;
+                            const minIndentDepth = code.split('\n').reduce((acc, line) => {
+                                if (!line.trim()) return acc;
+                                const match = line.match(/^(\s*)/);
+                                return match ? Math.min(acc, match[1].length) : acc;
+                            }, 9000);
+                            code = code.split('\n').map(line => line.slice(minIndentDepth)).join('\n')
+                            text = `\`\`\`${codeType?.split('/')?.[1] ?? ''}\n${code}\n\`\`\`\n`;
+                        }
+                        const area = chatInputField.textarea
+                        if(area){
+                            const start = area.selectionStart
+
+                            if ("\n" !== value[start - 1]) {
+                                text = `\n${text}`;
+                            }
+
+                            document.execCommand('insertText', false, text);
+                        }
+                    });
+                    break;
+                }
+            }
+        } else {
+            uploadDataTransfer(e.clipboardData);
+        }
+    } catch (error) {
+        console.error("Failed to read clipboard contents: ", error);
+    }
+});
+chatArea.addEventListener("drop", async (e) => {
+    e.preventDefault();
+    uploadDataTransfer(e.dataTransfer);
 });
 chatArea.addEventListener("dragover", e => {
     e.preventDefault();