Working with TOML

Fish Shell:
Working with TOML

How to:

To read and manipulate TOML in Fish, you might use a tool like yj, which can convert TOML to JSON. Here’s how:

# Install yj via Fisher
fisher install jorgebucaran/yj

# Convert TOML to JSON
echo 'title = "TOML Example"' | yj -tj

# Sample output
{"title":"TOML Example"}

To write TOML, you reverse the process:

# Convert JSON to TOML
echo '{"title":"JSON Example"}' | yj -jt

# Sample output
title = "JSON Example"

For heavy lifting, consider a dedicated TOML CLI tool like toml-cli.

# Install toml-cli
pip install toml-cli

# Set a value in TOML file
toml set pyproject.toml tool.poetry.version "1.1.4"

# Get a value from TOML file
set version (toml get pyproject.toml tool.poetry.version)
echo $version

Deep Dive

TOML (Tom’s Obvious, Minimal Language), introduced by Tom Preston-Werner in 2013, is akin to INI but with a defined spec and data hierarchy. JSON and YAML are the main alternatives, but they have their trade-offs: JSON isn’t as human-friendly, while YAML is more complex. TOML’s design thrives in scenarios where config files are often maintained by hand, balancing simplicity and expressiveness. When it comes to implementation, TOML parsers are available for most programming languages, including TomlBombadil for Fish that can slot right into your scripts.

Fish Shell:Working with TOML

How to:

Deep Dive

See Also

Fish Shell:
Working with TOML