Add showmd extension

[l0kyurue1]

Description

New extension: ShowMD, a markdown reader and editor that runs on localhost in your browser.

ShowMD is an existing open-source CLI (showmd-cli on npm). It serves a folder or a single file with a rendered read mode, a CodeMirror edit mode, and git-backed save history. This extension drives it from Raycast.

Commands:

• Open: pick a folder or file with a native dialog, or reopen something from recents.
• Manage ShowMD: list running windows and their Spaces. Open, restart, or stop them.
• Edit Settings: a form for ShowMD's color mode, font, browser, port, and update checks.
• Browse Agent Skills: opens ShowMD's Skills page, starting showmd skills if needed.
• Open Selected: opens the file or folder selected in Finder or Explorer.
• Menu Bar (macOS): running windows, recents, start/stop.

Also exposes three extension tools: open-document, list-recents, server-status.

Two things worth flagging for review:

Binary lookup. The extension needs the showmd binary. Raycast does not inherit a login shell's PATH, so src/lib/showmd.ts rebuilds a candidate directory list instead of trusting process.env.PATH. If nothing is found it falls back to npx -y showmd-cli, which works without an install but is slow the first time. A ShowMD Path preference overrides all of it.

Server reuse. A new target is added as a Space to an already-running ShowMD rather than spawning a second server. Turn it off with the Open in Running ShowMD preference.

Source lives at l0kyurue1/showmd under contrib/raycast/. Issues and PRs belong there.

Screencast

raycast-showmd-screencast.mp4

Checklist

• I read the extension guidelines
• I read the documentation about publishing
• I ran npm run build and tested this distribution build in Raycast
• I checked that files in the assets folder are used by the extension itself
• I checked that assets used by the README are placed outside of the metadata folder

[raycastbot]

Congratulations on your new Raycast extension! 🚀

We're currently experiencing a high volume of incoming requests. As a result, the initial review may take up to 15 business days.

Once the PR is approved and merged, the extension will be available on our Store.

[greptile-apps]

Greptile Summary

The PR adds the ShowMD extension, integrating its local Markdown server with Raycast.

• Adds commands for opening documents, browsing skills, managing server instances, editing settings, and menu-bar controls.
• Adds extension tools for opening documents, listing recents, and reporting server status.
• Adds binary discovery, exact-port server polling, tests, metadata, and Store documentation.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains; the previous changelog, ESLint configuration, generated preference typing, and wrong-server polling findings are resolved at the current head.

Important Files Changed

Filename	Overview
extensions/showmd/src/lib/showmd.ts	Implements ShowMD process discovery, spawning, server registry operations, exact-port readiness polling, settings, and recents.
extensions/showmd/src/lib/raycast-glue.ts	Connects Raycast commands to the plain Node ShowMD library and now preserves the spawned port across document and Skills launch flows.
extensions/showmd/package.json	Defines the extension metadata, commands, tools, preferences, supported platforms, dependencies, and scripts.
extensions/showmd/test/showmd.test.mjs	Covers process spawning, server selection, target opening, Skills behavior, readiness polling, and related helpers.
extensions/showmd/CHANGELOG.md	Provides the initial release entry using the required merge-date placeholder.
extensions/showmd/eslint.config.js	Wraps the Raycast flat configuration with ESLint's defineConfig API.

_{Reviews (3): Last reviewed commit: "fix: wait on the spawned port, refresh s..." | Re-trigger Greptile}