A fast and flexible command-line tool to colorize text lines using regular expressions.

glint is a drop-in replacement for tools like grcat, written in Rust for performance. It reads text from standard input and applies colors/styles based on patterns you define in a simple TOML config file.

• ⚡️ Fast — written in Rust, zero Python overhead
• 📜 PCRE-compatible regex (via Oniguruma)
• 🎨 Supports ANSI styles like bold, underline, red, etc.
• 🧩 Handles multiple matches per line
• 📁 Easy-to-read and write config file (rules.toml)

brew tap ryochin/tap
brew install glint

glint rules.toml < input.txt

dot.my.cnf

[mysql]

pager = /usr/local/bin/glint /etc/glint/rules.toml

Dockerfile

FROM mysql:8.0.32

RUN microdnf install -y wget

ENV GLINT_VERSION 0.1.0

RUN wget -q -O /usr/local/bin/glint \
    https://github.com/ryochin/glint/releases/download/v$GLINT_VERSION/glint-v$GLINT_VERSION-aarch64-unknown-linux-musl \
  && chmod 755 /usr/local/bin/glint \
  && mkdir -p /etc/glint \
  && wget -q -O /etc/glint/rules.toml https://raw.githubusercontent.com/ryochin/glint/refs/heads/main/rules.toml

COPY dot.my.cnf /root/.my.cnf

Each rule has:

• one or more regular expressions
• a color or style

[[rules]]
regexp = ["ERROR", "CRITICAL"]
color = "red"

[[rules]]
regexp = "WARN"
color = "yellow"

[[rules]]
regexp = "backup completed"
color = "green"

[[rules]]
regexp = "username="
color = "bold"

You can use either:

regexp = "WARN"

or

regexp = ["WARN", "WARNING"]

You can use any of the following:

• Colors: black, red, green, yellow, blue, magenta, cyan, white
• Text styles: bold, underline, blink, reverse, concealed
• default resets style

Currently, one style per rule. Multiple styles (like ["bold", "red"]) may be supported in the future.

The MIT License