TextFold Bridge

Link your Obsidian notes to papers in TextFold.

TextFold is a local reader that folds a paper into five zoom levels (Full, Brief, Key, Takeaway, Topic), translates it, and keeps your highlights, comments and questions to a model beside the text. TextFold Bridge connects it to Obsidian the way Zotero and the Zotero Integration plugin work together: TextFold stores and shows the papers and everything you wrote on them, and your notes keep links into it.

You need TextFold installed and running. This plugin does not install, start or update TextFold.

Which TextFold

TextFold 0.10.18 or later has everything the plugin uses: the desktop app writes server.json and opens textfold:// links, the reader's items drag into Obsidian, notes refold in place, and the server reports documents, citekeys and the reading language. Download TextFold, or run it from Python with python3 -m pip install textfold and python3 -m textfold serve. These parts of TextFold came from this plugin's proposals (chenxiachan/textfold#32, merged in #33 to #39).

With an older TextFold the plugin does what it can: it finds a TextFold run with python3 -m textfold serve (port 3017), opens links to a paper, paragraph, note or level in the browser, inserts links, lists TextFold's notes in the sidebar, exports notes and imports their TextFold notes. Hover previews then show less, the language falls back to English, dragging from the reader is not there, and Refold makes a new TextFold document instead of replacing the old one, so comments made on the old one stay there.

What it does

• textfold:// links. A link opens the paper in TextFold, at a paragraph, a note or a zoom level. Click it in Reading view, in Live Preview or in the sidebar.
• Hover previews. Hover a link to see its paragraph (at the link's level, else Takeaway) or its range of paragraphs, its section's heading, summary and paragraphs, its note, one turn of a conversation (question and answer), or the paper's title and authors. In Reading view a hover is enough; in the editor hold Cmd (Ctrl on Windows and Linux), as with Obsidian's page previews.
• Drops from TextFold. Drag a paragraph, a section's summary, a note, a conversation or a selection from TextFold's reader into any note, or copy and paste it: it goes in where you drop it, with its title, section and a link back.
• Insert link to a TextFold paper. A command that searches TextFold's documents by title, id or citekey and inserts [Title](textfold://open?paper=ID) at the cursor. With text selected, the selection becomes the link's label.
• TextFold sidebar. For the note you are in, two lists behind a switch at the top. In this note: every TextFold citation in the note, one line each with what it cites; a click goes to that place in the note. In TextFold: the TextFold documents the note refers to, each with its highlights, comments and Ask conversations under their sections; hover a line to read the whole note with the model's answer, open TextFold at it, copy or insert its link, or drag it into a note. Open the sidebar with the command Open TextFold notes.
• Fold this note. Read the note you are writing at TextFold's five levels, inside Obsidian: Full is your note as Obsidian shows it, and its words travel as you fold it down to Brief, Key, Takeaway and the Topic map, as in TextFold's reader.
• Export this note to TextFold. Send the note to TextFold and read it there. Both use the same TextFold document, so a note folded in Obsidian opens in TextFold at the same place, with the same comments, and the other way round. When you edit the note, the sidebar says Changed since folding and offers Refold.
• Import notes from TextFold. Bring a document's TextFold notes into the vault as a note of its own, and update it later without losing what you wrote in it.

A note refers to a document through a property, a link in its text, or both:

---
textfold: "2605.00089"
---
The zoning step follows [Convex Partition Zoner](textfold://open?paper=pdf-357ae69fe0759131&u=u6&level=key).

textfold: also takes a list of ids. Put an arXiv id in quotes, as above, or YAML may read it as a number and drop a trailing zero.

Citations in this note

In this note, at the top of the sidebar, lists every textfold:// link in the open note, in reading order: plain links, dropped callouts and quotes, and the ↗ icon links alike. A line shows what the link cites, as TextFold has it (the paragraph at the link's level, else Takeaway; for a range of paragraphs the first and how many follow, as "… (+2)"; a section's heading; a note's passage; an Ask's question, the linked turn's for a link to one turn), or else the link's own words, and on the right the paper's short title. Hover a line to preview it.

• Click a line to go to the link in the note: it scrolls into the middle and lights up for a moment, with the cursor on it in Live Preview and Source mode; in Reading view its line and the link light up.
• The TextFold icon on a line (shown on hover) opens TextFold there, as a click on the link would.
• By heading · By paper chooses the grouping: under the note's headings (links before the first heading under the note's title), or by paper, then by the paper's section, in the paper's order. Each group shows its count and folds away with a click. The plugin remembers the choice.

The list follows the note as you edit it and as you switch notes; it asks TextFold again only when the set of cited papers changes.

Drops from TextFold

Drag something from TextFold's reader (a paragraph by its handle, a section by its heading, a summary, a card or chip of the Topic map, a note's card, or selected text, also over several paragraphs) into a note, or copy it and paste. The item goes in at the drop point, as set under Settings → TextFold Bridge → Drops from TextFold → Dropped TextFold items as:

• Callout (default):

  > [!textfold] Convex Primitive Decomposition › 3 Method
  > The paragraph, at the level it was dragged at. [↗](textfold://open?paper=2602.07369&u=S3.p2&level=key)
  

  The callout's last line ends with a ↗ link back, which the plugin draws as TextFold's icon. A note shows its passage and then your comment; a conversation its passage, your question in bold and the answer. When the text is the model's words (a Key, Takeaway or Topic level, a summary, an answer), the callout says [!textfold|written] and shows "written by the model" after its title. The callout carries TextFold's icon and takes the colour of your theme's "example" callout.

• Quote: the text as a quote, its last line ending in the ↗ link back (and "written by the model" for the model's words).

• Text: just the text, followed by the TextFold icon that links back:

  Primitives are fitted greedily. [↗](textfold://open?paper=2602.07369&u=S3.p2&level=key)
  

  A paragraph, summary, selection or chip goes in as it read; a note as its passage, then your comment; a conversation as its answer in one sentence. Dropped among words it goes in among them, else on a line of its own. The plugin draws every textfold:// link labelled exactly ↗ as TextFold's icon, in Reading view and in Live Preview (put the cursor in it to edit the Markdown); a click opens TextFold there and a hover previews it. Without the plugin, on another device or in another app, it reads as the text and a ↗ link.

• Full link: a titled link, [Title › Section](link), among the words where it was dropped.

Several paragraphs at once. A section dragged by its heading brings its summary and its paragraphs at the level it was dragged at, its subsections' too: at Key, Takeaway and Topic as - bullets under each summary, at Full and Brief as paragraphs. A selection over several paragraphs brings the selected words, a paragraph each, and its link covers them all (u=<first>&to=<last>): opened, TextFold lights up every one of them. A selection of a few words in one paragraph brings those words and links to the whole paragraph. As a Callout the title is the paper and the section's heading, and every line is quoted, bullets kept; a Quote has the heading in bold on its first line; Text has a bold heading line, then the lines as they came, on lines of their own even when dropped among words; Full link is one titled link. Each ends with the TextFold icon on its last line.

A dragged or pasted bare textfold:// link is filled in the same way from TextFold (title, section, the paragraph, the range of paragraphs or the section at the link's level). Every other drop and paste is left to Obsidian. Rows of the TextFold notes sidebar can be dragged into a note the same way.

Fold this note

Run Fold this note (or the fold button in the sidebar) in a note. The note opens folded in its tab, at the level set under Start level (Full to begin with). Its TextFold document is the one Export this note to TextFold makes: if the note has none yet, or changed since, Fold this note exports it first (asking the first time, as Export does) and shows the note as written until TextFold is done. The pencil at the top goes back to the Markdown, and the TextFold icon beside it opens TextFold at the paragraph you are reading.

The five levels, as in TextFold:

• Full: your note as Obsidian renders it, with its links, pictures, callouts, code and maths. Its words are TextFold's words too: each paragraph is matched to TextFold's by order and wording, so they can travel to Brief and back.
• Brief: the sentences TextFold keeps of each paragraph, your own words, with … where it left one out.
• Key, Takeaway and Topic are written by the model; a line under the title says so and which model wrote them. At Key and Takeaway each section has its takeaway on top. Hover a written line to see the sentences of yours it rests on.
• Topic is a map: a card per section with a chip per paragraph. Click a card for that section at Takeaway, a chip for that paragraph at Full.

To change level, click a level, press 1 to 5 while the view has focus, or use ⌘ + scroll (Ctrl + scroll on Windows and Linux) or a pinch: the words move with your fingers and settle on the nearer level when you stop, and the paragraph under the pointer stays where it is. Click a folded paragraph to read it alone at Full, and again to fold it back. With Level control → Slider a slider takes the place of the buttons and moves the words as you drag it. With reduced motion set in your system, levels change without moving.

Your highlights, notes and Ask conversations from TextFold are shown with their paragraphs: with TextFold comments → In the margin in full beside Full and Brief, as one line beside Key and as a dot beyond; with Under the paragraph in full under it where it is read in full. Highlights are marked in the text either way, and a paragraph whose highlight is folded away gets a mark. Click a comment to open it in TextFold.

Language. The menu at the top reads the note in another of TextFold's languages. The first time in a language, it asks before TextFold translates the note with its model, then shows the progress. In another language than the note's own, Full and Brief are the model's translation of your words, as the line under the title says, and the pencil still shows your Markdown. The view starts in the language set under Settings → TextFold Bridge → Fold this note → Language.

When TextFold is not running, the view shows the fold it last read on this device (kept in Obsidian's local storage on this device, never in the vault), else the note at Full, and a line says so.

Export this note to TextFold

Run Export this note to TextFold (or the upload button in the sidebar) in a note. The first time, the plugin asks before it sends anything. Then:

1. It sends the note's text to TextFold as a Markdown document, with Obsidian's own syntax flattened: [[Note|label]] becomes label, [[Note]] becomes Note, %% comments %% are left out, a callout becomes a plain quote, and block ids and ==highlight== marks go. Code is sent as written. The note's properties stay in Obsidian; only a title property goes along.
   • Pictures go along. A picture of the vault the note embeds (![[plot.png]], ![[plot.png|300]], ![[photo.jpg|caption]], or ![alt](figures/plot.png)) is sent inside the text as the picture itself, and TextFold keeps it with the document: PNG, JPEG, GIF and WebP up to 15 MB each. A picture on the web (![alt](https://…)) is sent as it is, and TextFold downloads it. SVG pictures, larger files and embeds that lead nowhere are left out, and so are embedded notes and PDFs. The notice after folding says how many pictures went along and which were left out, and why. Changing a picture's file counts as a change of the note.
2. It records the new document's id in the note's textfold: property.
3. TextFold folds it in the language set under Settings → TextFold Bridge → Fold this note → Language: TextFold's language (the default) is the reading language set in TextFold, else English; or pick one of TextFold's languages. Folding uses the model you set up in TextFold, at its cost. Without a model, TextFold stores the note and it reads as written; the sidebar says so.

The sidebar shows the fold's progress, then Folded with Fold in Obsidian and Open in TextFold; the notice at the end offers both too. The plugin keeps a hash of the text it sent, so after an edit the sidebar shows Changed since folding and Refold. A refold puts the new text in place of the old under the same id: your highlights and questions on the note stay, TextFold finds their passages again in the new text, and asks its model only for the sections that changed. A note whose passage is gone after the edit stays, marked Passage not found after the edit. If TextFold is still folding the note, Refold says so and does nothing; if TextFold no longer has the document, the plugin takes the id out of the note's property, and the next fold or export makes a new document.

Refold in place needs TextFold 0.10.18 or later.

Import notes

Import notes from TextFold picks a document, or all documents that have notes; the sidebar's download buttons import the documents shown there. Each document becomes one note, named by its short title (the part before a colon) or, with Note names → Citekey, by its citekey when TextFold has one. Location for imported notes, as Obsidian words it for attachments, says where a new one goes:

• In the folder specified below (default): the folder set under Folder, TextFold to begin with.
• Same folder as current note: next to the note that is open when the import starts (for the sidebar's buttons, the note the sidebar shows). With no note open, the folder setting is used, and the notice says so.
• Vault folder: the top of the vault.

A document never gets a second note: before creating one, the plugin looks through the whole vault for the note it imported before (by its textfold property and the marker comments below), and updates that one where it is now, also after you moved it. The notice says what happened, such as "Updated Convex Partition Zoner in Research/Zoning" or "Created …".

• Properties: textfold (the id), title, authors, year, citekey when there is one, and link (textfold://open?paper=…).
• The notes come between two marker comments, %% TextFold notes: … %% and %% End of TextFold notes %%, in the style of TextFold's own Markdown export for Obsidian: grouped by section, each highlight a quote with the note's id as its block id (^n-…, so other notes can link to it), then your comment; each Ask conversation a [!question] callout, its citations links to the paragraphs they name. Each note's last line (your comment, else its passage or conversation) ends with a ↗ link back to it in TextFold, drawn as TextFold's icon; the document's own link at the top stays a plain link. A re-import rewrites these lines with the rest of the block.
• Importing again finds the note by its textfold property and the markers, wherever it is in the vault, replaces only what is between the markers and the properties above, and keeps everything else you wrote in the note and its other properties. An unchanged document leaves the note untouched.

Section names, paragraph previews and the cite labels in imported answers come from TextFold's GET /api/doc (TextFold 0.10.18 or later); without it the plugin works without them.

Links

textfold://open?paper=<document id>[&s=<section id>][&u=<paragraph id>[&to=<paragraph id>]][&n=<note id>[&t=<turn>]][&level=<full|brief|key|takeaway|topic>][&lang=<code>]

• paper: the document's id in TextFold, as in its reader's address (/p/<id>).
• s: a section; u: a paragraph; to: with u, the last paragraph of a range from u, which TextFold lights up together; n: one of your notes; t: with n, one turn of its conversation (0 is the first question), which TextFold scrolls to in the chat or the note's window; level: the zoom level; lang: the language to read it in.

Before it opens a link, the plugin asks the running TextFold whether it has the document. If it has not (a link to a paper in another TextFold library, or one deleted since), a notice names the paper and nothing opens, instead of TextFold's home screen. If TextFold is not running, a link in TextFold app mode opens anyway, which starts the app.

Settings → TextFold Bridge → Links → Open links in chooses where a link opens:

• Browser (default): TextFold's reader page on the running TextFold, in your default browser.
• TextFold app: Obsidian hands the textfold:// link to the system, for TextFold's desktop app to open. TextFold's desktop app registers itself for them from 0.10.18 on; with an older app, or with TextFold run from Python, keep Browser. Obsidian asks once before it opens links of a new kind; tick Always open there to stop the question.

Finding TextFold

With TextFold address set to Automatic, the plugin reads server.json, which TextFold writes into its data folder while it runs, and uses http://127.0.0.1:3017 (the port of python3 -m textfold serve) when there is none. A server.json left behind by a crash is skipped: its process must still run and its address must answer. TextFold's data folder:

System	Folder
macOS	~/Library/Application Support/TextFold
Windows	%LOCALAPPDATA%\TextFold
Linux	$XDG_DATA_HOME/textfold, or ~/.local/share/textfold

A TextFold run from a clone of its repository writes server.json in the clone's folder instead: name that folder under TextFold run from source, or set TextFold address to Manual and enter its address. Test connection shows whether TextFold answers, its version, and where its address came from.

Privacy

• The plugin talks only to TextFold on 127.0.0.1. It refuses any other address, also one set by hand.
• It reads TextFold's documents, notes and jobs with GET requests, one at a time, each given up after a few seconds. A drop or paste from TextFold reads only what was dropped (and asks TextFold for a bare link's title and text).
• It writes to TextFold only when you fold or export a note, or translate one: POST /api/import with the note's flattened text, and POST /api/generate to fold or translate it. TextFold then sends the text to the model you set up in TextFold. Nothing else in TextFold is changed.
• It asks TextFold for its languages (GET /api/langs) and its reading language (GET /api/settings); a TextFold without them gets its built-in list of languages and English.
• The fold view keeps the last fold it read of each note in Obsidian's local storage on this device, to show while TextFold is not running. It is never written into the vault.
• Files outside the vault. It uses Node's fs to read one file, TextFold's server.json, in TextFold's data folder (see the table above) or the folder named under TextFold run from source, because TextFold's app picks a new port at each launch and says which in that file. It never writes outside the vault, and reads nothing else there. This is why the plugin is desktop only.
• Your vault's files. It reads the note that is open (for the sidebar and its citations) and the notes you fold or export, with the pictures they embed. It writes only where you ask: a drop or paste into a note, the textfold property of a note you fold or export, and the notes Import notes writes. To find the note it imported earlier for a document, wherever you moved it, Import notes goes through the list of Markdown notes and reads their properties (it looks for its own textfold property and marker comments); it does this only when you import.
• Clipboard. Copy link in the sidebar writes the link to the clipboard, only when you click it. A paste from TextFold is read from the paste you make, as Obsidian hands it over; the plugin never reads the clipboard on its own.
• It sends no telemetry and contacts no other server.
• Text from TextFold is shown through Obsidian's Markdown renderer or as plain text, never inserted as HTML.

License

MIT, except two files of the fold view adapted from TextFold, which stay under the Apache License 2.0: src/fold/align.ts (the words of each level and their ids) and src/fold/motion.ts (the words travelling between levels), from TextFold's reader and word alignment. See NOTICE and LICENSE-APACHE-2.0.

TextFold is a separate project by Xia Chen, github.com/chenxiachan/textfold, under the Apache License 2.0. The fold view follows its reader: the five levels, the words that travel between them and the Topic map are TextFold's design.