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Developers setup

Requirements

Diffuse depends on these projects:

Python 3.8+
PyPi
Cairo and GObject Introspection development headers
Meson
Flatpak and Flatpak builder (Linux only)

Install the distribution dependencies

It's a bit difficult to get the command lines for all the distributions and their releases, but it should be enough to find the packages on other distributions.

Debian/Ubuntu

sudo apt install python3-pip libcairo2-dev libgirepository1.0-dev meson flatpak flatpak-builder

Note: Tested on Debian 11 (Buster) and Ubuntu 20.04 (Focal)

Fedora

sudo dnf install python-pip cairo-devel cairo-gobject-devel meson flatpak flatpak-builder

Note: Tested on Fedora 34

Mac OS

On Mac, all deps can be fetched using Homebrew.

brew install meson python3 py3cairo pygobject3 gtk+3

Note: Tested on macOS 12.5 (Monterey)

You don't need to use pip because the above brew command installs all dependencies.

Install the project dependencies

To install the requirements just to execute the binary, run:

pip install -r requirements.txt

For developer tools, run this one instead (it includes requirements.txt):

pip install -r requirements.dev.txt

Setup on Linux

Build, test and install using Flatpak

To install Diffuse locally:

flatpak install runtime/org.gnome.Sdk/$(uname -p)/42
flatpak-builder --user --install build-flatpak io.github.mightycreak.Diffuse.yml

To run Diffuse through Flatpak:

flatpak run io.github.mightycreak.Diffuse

To uninstall Diffuse:

flatpak remove io.github.mightycreak.Diffuse

Build, test and install using Meson on Linux and Mac OS

Diffuse build system is meson.

To compile and test Diffuse:

meson setup build
cd build
meson compile
meson test

To install Diffuse on your system (e.g. /usr/local/):

meson install # requires admin privileges

# Run Diffuse
diffuse

To install Diffuse on a custom directory (e.g. ~/bin/diffuse):

meson install --destdir ~/bin/diffuse

# Run Diffuse
cd ~/bin/diffuse/usr/local/bin
PYTHONPATH=$HOME/bin/diffuse/usr/local/share/diffuse ./diffuse

To uninstall diffuse afterwards:

sudo ninja uninstall -C build
sudo rm -v /usr/local/share/locale/*/LC_MESSAGES/diffuse.mo

Meson allows to change the default installation directories, see command-line documentation.

Setup on Mac OS

Building on Mac OS is similar to building on Linux. To recap, these are the steps needed to build and install Diffuse manually:

  meson setup build
  cd build
  meson compile
  meson test
  meson install

After meson install, the diffuse command can be used to launch Diffuse as a native Mac app that is installed into /Applications/Diffuse.app.

The diffuse command is compatible with git. To use Diffuse as git's git difftool run git config --global diff.tool diffuse

Setup on Windows

Note: The Windows port is not maintained and would need some love. Contributions are very welcome! 😉

The windows-installer directory contains scripts for building an installable package for Windows that includes all dependencies.

Diffuse can be packaged as a portable application by copying the installation directory to a pen drive and creating a front end that sets the XDG_CONFIG_HOME and XDG_DATA_DIR environment variables prior to launching Diffuse. The XDG_CONFIG_HOME and XDG_DATA_DIR environment variables indicate where Diffuse should store persistent settings (eg. the path to a writable directory on the pen drive).

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