github-linguist/linguist

VTL

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#7,527 opened on Aug 13, 2025

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Add LanguageGood First Issue

Description

Language name

Validation and Transformation Language

URL of example repository

https://github.com/sdmx-twg/vtl

URL of syntax highlighting grammar

https://github.com/sdmx-twg/vtl/blob/master/v2.1/src/main/antlr4/org/sdmx/vtl/Vtl.g4

Most popular extensions

.vtl

Detected language

Contributor guide

Tech stack
ruby
Domain
tooling
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of linguist's language definitionBasic YAML syntax
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
85
Research direction
Examine the existing language definitions in `lib/linguist/languages.yml` and add a new entry for VTL using the provided grammar URL and extension `.vtl`. Review the contributing guidelines for exact format requirements. Test the change locally using the Linguist test suite to ensure correct detection of `.vtl` files.