philocalyst/infat: A command line tool to set default openers for file formats and url schemes on macos

Infat is an ultra-powerful, macOS-native CLI tool for declaritively managing both file-type and URL-scheme associations. Avoid the hassle of navigating sub-menus to setup your default browser or image viewer, and the pain of doing that every time you get a new machine. Setup the rules once, and bask in your own ingenuity forevermore. Take back control, and bind your openers to whatever. You. Want. Override everything! Who’s going to stop you?

• List which apps open a given file extension or URL scheme
• Set a default application for a file extension or URL scheme
• Load associations from a TOML config ([files] and [schemes] tables)
• Verbose, scriptable, and ideal for power users and admins

Get started by installing Infat — jump to the Install section below.

# Show the default app for .txt files
infat list txt

# Show all registered apps for .txt files
infat list --assigned txt

# Use TextEdit for .md files
infat set TextEdit --file-type md

# Use VSCode for .json files
infat set VSCode --file-type json

# Use Mail.app for mailto: links
infat set Mail --scheme mailto

Place a TOML file at $XDG_CONFIG_HOME/infat/config.toml (or pass --config path/to/config.toml) with two tables:

[files]
md    = "TextEdit"
html  = "Safari"
pdf   = "Preview"

[schemes]
mailto = "Mail"
web    = "Safari"

Run without arguments to apply all entries.

infat --config ~/.config/infat/config.toml

• Minimal & Scriptable
  Infat is a single-binary tool that plays well in shells and automation pipelines.

• macOS-First
  Leverages native NSWorkspace, Launch Services, and UTType for robust integration.

• Declarative Configuration
  TOML support allows you to version-control your associations alongside other dotfiles.

You’ll need just and Swift 5.9+:

# Debug build
just build

# Release build
just build-release

# Run in debug mode
just run "list txt"

# Enable verbose logging for troubleshooting
infat --verbose list pdf

brew install philocalyst/tap/infat

git clone https://github.com/philocalyst/infat.git
cd infat
just build-release
cp .build/release/infat /usr/local/bin/infat

For the full history of changes, see CHANGELOG.md.

• Inspired by duti
• Built with Swift, thanks to corporate overlord Apple’s frameworks
• Thanks to all contributors and issue submitters (One day!!)

Infat is licensed under the MIT License.
Feel free to use, modify, and distribute!