Split index.js to separate files (#17315)

* split `index.js` to separate files

* tune clipboard

* fix promise

* fix document

* remove intermediate empty file

* fix async event listener

* use `export function` instead of `export {}`, add more comments

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>

web_src/js/features/comp/ImagePaste.js

@@ -0,0 +1,91 @@
+const {AppSubUrl, csrf} = window.config;
+
+async function uploadFile(file, uploadUrl) {
+  const formData = new FormData();
+  formData.append('file', file, file.name);
+
+  const res = await fetch(uploadUrl, {
+    method: 'POST',
+    headers: {'X-Csrf-Token': csrf},
+    body: formData,
+  });
+  return await res.json();
+}
+
+function clipboardPastedImages(e) {
+  if (!e.clipboardData) return [];
+
+  const files = [];
+  for (const item of e.clipboardData.items || []) {
+    if (!item.type || !item.type.startsWith('image/')) continue;
+    files.push(item.getAsFile());
+  }
+
+  if (files.length) {
+    e.preventDefault();
+    e.stopPropagation();
+  }
+  return files;
+}
+
+
+function insertAtCursor(field, value) {
+  if (field.selectionStart || field.selectionStart === 0) {
+    const startPos = field.selectionStart;
+    const endPos = field.selectionEnd;
+    field.value = field.value.substring(0, startPos) + value + field.value.substring(endPos, field.value.length);
+    field.selectionStart = startPos + value.length;
+    field.selectionEnd = startPos + value.length;
+  } else {
+    field.value += value;
+  }
+}
+
+function replaceAndKeepCursor(field, oldval, newval) {
+  if (field.selectionStart || field.selectionStart === 0) {
+    const startPos = field.selectionStart;
+    const endPos = field.selectionEnd;
+    field.value = field.value.replace(oldval, newval);
+    field.selectionStart = startPos + newval.length - oldval.length;
+    field.selectionEnd = endPos + newval.length - oldval.length;
+  } else {
+    field.value = field.value.replace(oldval, newval);
+  }
+}
+
+export function initCompImagePaste($target) {
+  $target.each(function () {
+    const dropzone = this.querySelector('.dropzone');
+    if (!dropzone) {
+      return;
+    }
+    const uploadUrl = dropzone.dataset.uploadUrl;
+    const dropzoneFiles = dropzone.querySelector('.files');
+    for (const textarea of this.querySelectorAll('textarea')) {
+      textarea.addEventListener('paste', async (e) => {
+        for (const img of clipboardPastedImages(e)) {
+          const name = img.name.substr(0, img.name.lastIndexOf('.'));
+          insertAtCursor(textarea, `![${name}]()`);
+          const data = await uploadFile(img, uploadUrl);
+          replaceAndKeepCursor(textarea, `![${name}]()`, `![${name}](${AppSubUrl}/attachments/${data.uuid})`);
+          const input = $(`<input id="${data.uuid}" name="files" type="hidden">`).val(data.uuid);
+          dropzoneFiles.appendChild(input[0]);
+        }
+      }, false);
+    }
+  });
+}
+
+export function initSimpleMDEImagePaste(simplemde, dropzone, files) {
+  const uploadUrl = dropzone.dataset.uploadUrl;
+  simplemde.codemirror.on('paste', async (_, e) => {
+    for (const img of clipboardPastedImages(e)) {
+      const name = img.name.substr(0, img.name.lastIndexOf('.'));
+      const data = await uploadFile(img, uploadUrl);
+      const pos = simplemde.codemirror.getCursor();
+      simplemde.codemirror.replaceRange(`![${name}](${AppSubUrl}/attachments/${data.uuid})`, pos);
+      const input = $(`<input id="${data.uuid}" name="files" type="hidden">`).val(data.uuid);
+      files.append(input);
+    }
+  });
+}