Fluff Linux Calculator

A native Qt 6 calculator built for Fluff Linux

Calculator modes

Basic

Basic mode provides a familiar keypad for everyday arithmetic, percentages, parentheses, keyboard input, history, undo, and redo.

Advanced

Advanced mode adds powers, roots, factorials, logarithms, trigonometric functions, rounding functions, constants, complex numbers, and degree, radian, or gradian angle units.

Expressions support convenient notation such as 2pi, 2(3+4), √9, ∛8, ⁵√32, and root(5,32).

Financial

Financial mode includes compound term, depreciation, future value, present value, payment, rate, margin, and term calculations.

Programming

Programming mode includes:

• Hexadecimal, decimal, octal, and binary input with live previews
• Signed word sizes from 8 bits through 4096 bits
• Boolean operations, shifts, rotations, byte swapping, and integer functions
• A clickable bit field with rows of eight bits
• A programmer keypad with hexadecimal digits
• A side history panel
• Remembered keypad or bit field selection

Conversion

Conversion mode supports length, mass, area, volume, temperature, time, speed, data size, and angle units.

Calculation features

• Arbitrary precision real, integer, and complex calculations using Rug, GMP, MPFR, and MPC
• At least 1024 bits of internal precision
• Automatic, fixed, scientific, and engineering output formats
• Up to 100 decimal places
• Optional digit grouping
• Calculator style percentages such as 100-50% = 50
• Implicit multiplication
• Typed expressions and pasted Unicode multiplication or division symbols
• High precision complex roots, powers, logarithms, and trigonometric functions
• Per mode window size and maximized state memory
• Theme aware Qt Quick Controls interface

Build

Requirements

The project requires Rust, CMake, Ninja, a C++ compiler, Qt 6 Base, Qt 6 Declarative, Qt 6 Wayland, GMP, MPFR, and MPC.

On Arch Linux or Fluff Linux, install the build dependencies with:

sudo pacman -S --needed base-devel rust cmake ninja qt6-base qt6-declarative qt6-wayland gmp mpfr libmpc

Build the release binary:

cargo build --release --locked

Run it directly:

./target/release/flufflinux-calculator

Tests

Run the Rust test suite:

cargo test --locked

Run the QML interface tests:

QT_QPA_PLATFORM=offscreen /usr/lib/qt6/bin/qmltestrunner -input tests/qml -import qml

Validate every translation catalog and desktop entry locale:

make check-translations

Packaging

Build the release binary and create a ready to package filesystem tree:

make fakeroot

The generated tree contains the executable, desktop entry, application icon, AppStream metadata, licenses, and compiled language catalogs under their final /usr paths.

Run the staged application without installing it:

./fakeroot/usr/bin/flufflinux-calculator

Create a pacman package archive:

bsdtar --zstd -cf flufflinux-calculator-2026.09-3-x86_64.pkg.tar.zst -C fakeroot .PKGINFO usr

Package build systems can install into their own staging directory:

make build
make DESTDIR="$pkgdir" install

Translating

Translation sources are stored in translations. Qt Linguist can be used to edit an existing .ts catalog.

linguist translations/flufflinux-calculator_de.ts

After changing visible QML text or adding a language, update the catalogs:

make update-translations

Compile and validate them:

make translations
make check-translations

Test a specific language locally:

LANGUAGE=de ./target/release/flufflinux-calculator

See TRANSLATING.md for the complete editing, testing, and new language workflow.

Settings

Preferences and window state are stored in $XDG_CONFIG_HOME/flufflinux-calculator.conf, or ~/.config/flufflinux-calculator.conf when XDG_CONFIG_HOME is not set.

License

Fluff Linux Calculator is distributed under the GNU General Public License v3.0 or later. See LICENSE.