IntelliSense

Calypso has real IntelliSense — the same kind of language smarts you get on a desktop editor: accurate autocomplete, type-aware hover, live error diagnostics, signature help, and go-to-definition. It runs on-device, using language servers inside Termux bridged to the editor over local loopback — no remote server, no account.

What you get

Once enabled, supported files get:

• Autocomplete — real, type-aware completions (not just keywords).
• Hover — types and docs when you tap/point at a symbol.
• Diagnostics — errors and warnings underlined live as you type.
• Signature help — parameter hints while you’re inside a call.
• Go-to-definition — jump to where a symbol is defined, across files.

Supported languages

Language	Server
TypeScript / JavaScript (.ts .tsx .js .jsx .mjs .cjs)	typescript-language-server
Python (.py)	pyright
Bash (.sh .bash)	bash-language-server
HTML / CSS / JSON	vscode-langservers-extracted
YAML (.yaml .yml)	yaml-language-server

More can be added over time. (Native-binary servers like gopls and rust-analyzer aren’t bundled yet — they need a Go/Rust toolchain in Termux.)

Enabling it

IntelliSense runs the servers in Termux, so it needs the Termux setup done first. Then it’s essentially automatic:

1. Finish the Termux setup (toolchain installed).
2. On the Termux setup screen, tap Install language servers.
3. When the install finishes, IntelliSense turns itself on — open a supported file and you’re done.

That’s the whole flow: install the servers, and it just works. You can also toggle it any time in Settings → IntelliSense, or from the Command Palette (Enable / Disable IntelliSense).

Why Termux?

Real language servers are full programs. Calypso runs them in Termux — the same loopback approach as the embedded terminal — and bridges them to the editor. So IntelliSense is a Tier 2 feature (it needs Termux), while basic completion below works with no setup.

Without Termux: basic completion

Even with no setup, the editor still gives you keyword + word-in-document completion and snippets (tab-stop templates for JS, TS, Python, HTML, CSS, Dart and Markdown — type a prefix and press Tab/Enter). You only need the language servers above for type-aware completion, hover, and diagnostics.

The status chip

The editor’s status bar shows an IntelliSense chip for supported files. Its colour tells you the state, and tapping it opens a panel that explains what’s happening and offers the fix:

• Grey — off, or Termux/servers not yet installed → tap to enable or to open setup.
• Amber “IntelliSense…” — the server is starting (a cold start takes a few seconds the first time).
• Green — connected and live.
• Red “IntelliSense !” — couldn’t reach the server → tap to retry or reopen setup.

So if completions aren’t showing, the chip is the first place to look.

Go to definition

Three ways to jump to a definition:

• Press F12 (with a hardware keyboard).
• Tap the go-to-definition button on the accessory bar (it appears only when a language server backs the current file).
• Command Palette → Go to Definition.

Same-file jumps move the caret; cross-file jumps open the target file and reveal the line.

Tips

• The first file you open in a session is the only slow one — the server cold starts, then stays warm. Calypso also pre-warms the bridge when you open a project, so that first jump from amber to green is quicker.
• Switching tabs between supported files keeps the server warm — no re-start.
• If a server gets into a bad state, open the chip’s panel and Restart language servers.

Hitting problems? See Troubleshooting → IntelliSense.