Smart file previews

Many file types get the same 3-mode preview (Editor / Split / Preview) as Markdown, turning raw data and config into something readable. Each is on by default and toggled under Settings → Editor.

Structured data and API docs

• .json, .yaml, and .toml render a collapsible, type-colored data tree.
• .xml (xsd, xsl, fxml, pom, wsdl, rss, and so on) renders a faithful DOM tree of tags, attributes, and text.
• A JSON or YAML file recognized as an OpenAPI 3 / Swagger 2 spec instead renders as browsable API docs: endpoints with colored method badges, params, responses, and schemas. Toggle between the tree and the docs with structured.toggleView.

Config files, decoded to plain English

• crontab (crontab, *.cron, cron.d/*): each schedule in plain English (30 2 * * 1-5 becomes “At 02:30, Monday through Friday”), the next fire times, and the @reboot / @daily macros. Malformed lines are flagged with the field error.
• fstab: each mount line decoded, the device spec (UUID / LABEL / path / CIFS / NFS), mount point, filesystem, and the options.
• systemd units (.service / .timer / .socket / …): each directive glossed, with a .timer’s OnCalendar= decoded to English plus its next triggers.
• SSH config: a one-line connection summary per Host block plus option glosses.
• Dockerfile: a per-build-stage digest (base image, ports, workdir, user, entrypoint, health check).
• GitHub Actions workflows (detected by content): a plain-English digest of the triggers (with schedule: crons decoded) and each job’s runner and steps.

Viewers

• .pdf files open in a read-only page viewer (rasterized via PDFBox).
• .svg files stay editable XML but gain a live rendered-image preview.
• Binary files open as a read-only hex dump.

Every preview can export to PDF from its right-click menu.