Gregorio GABC

Gregorio GABC — Zed Extension

Adds support for GABC/NABC (Gregorian chant notation) files to Zed.

Features

• Syntax Highlighting — Full highlighting for GABC headers, pitches, clefs, neumes, bars, alterations, style tags, NABC notation, and comments.
• LaTeX Injection — TeX code inside <v>…</v> tags and verbatim attributes ([nv:…], [gv:…], [ev:…]) gets LaTeX highlighting.
• Bracket Matching — Auto-matching for (), [], {}, and <>.
• Code Outline — Headers appear in the document outline/symbols panel.
• Language Server — Diagnostics, hover, completion, and document symbols via gregorio-lsp.
• Document Formatting — Format .gabc files via Format Document (Alt+Shift+F / ⌥⇧F) or on save, powered by grefmt (part of gregorio-lsp ≥ 0.9.0).

Prerequisites

For Language Server features (diagnostics, hover, completions, formatting):

Install gregorio-lsp via Cargo (v0.9.0 or later includes the grefmt formatter):

cargo install --git https://github.com/aiscgre-br/gregorio-lsp \
  --tag v0.9.0 --bin gregorio-lsp

Make sure ~/.cargo/bin is in your PATH. Syntax highlighting works without any prerequisites.

Installation

From Zed Extensions Marketplace

Search for "Gregorio" in Zed → Extensions.

As Dev Extension

1. Clone this repository
2. In Zed, run zed: install dev extension and select the cloned directory

Grammar

This extension uses tree-sitter-gregorio (v0.5.2, commit c9034de8), a complete tree-sitter grammar for GABC+NABC notation compatible with Gregorio 6.2.0.

Formatting

Formatting is provided by the gregorio-lsp language server (which embeds grefmt). No additional binary is required beyond the gregorio-lsp server already installed for diagnostics.

Using the formatter

• Format Document: Alt+Shift+F (Linux/Windows) or ⌥⇧F (macOS)
• Format on save: add to your Zed settings.json:

  {
    "languages": {
      "GABC": {
        "format_on_save": "on"
      }
    }
  }
  

Formatter options

Configure via the formatting key in Zed's LSP settings (settings.json):

{
  "lsp": {
    "gregorio-lsp": {
      "initialization_options": {},
      "settings": {
        "formatting": {
          "maxLineWidth": 80,
          "breakAfterClef": false,
          "breakAfterBar": false
        }
      }
    }
  }
}

License

MIT — Copyright (c) 2026 AISCGre Brasil. See LICENSE.