pasted-file-editor

Type in the editor as usual. A paste of 200 characters or more, a copied file, a dropped file, or one chosen with Attach file does not land in the editor: it attaches below as a card with a name and a preview. Open a card to read the whole file (or see the image), load a text attachment into the editor, or download it. The editor itself downloads under the filename field; a blank name becomes pasted-file.txt and a name without an extension gets .txt. The status line counts characters, lines, and UTF-8 bytes. Clear empties the editor and the attachments. Nothing leaves the browser.

The pure part is wal-sh.tools.pasted-file-editor.core (host-neutral .cljc, tested on the JVM with test.check: the reduction is total over garbage, edit-then-clear is empty, the counts agree with the text, and the download filename is idempotent). The browser adapter is wal-sh.tools.pasted-file-editor.browser. Build: gmake tools-cljs; debug in isolation: gmake dev-tool TOOL=pasted-file-editor.

Adapted from Simon Willison's Pasted File Editor (source); the attachment model, the 200-character threshold, and the preview rules are his.

See experiments: this tool ships behind tool.pasted-file-editor.