Snap desktop application theming experiment

README.md

1. Build all snaps

2. Install all snaps

3. Connect interfaces:

   snap connect gtk3-demo:gtk3-themes ubuntu-themes:gtk3-themes
   snap connect gtk3-demo:icon-themes ubuntu-themes:icon-themes
   snap connect gtk3-demo:gtk3-themes adwaita-theme:gtk3-themes
   snap connect gtk3-demo:icon-themes adwaita-theme:icon-themes
   snap connect gtk3-demo:gtk3-themes evopop-theme:gtk3-themes

4. Run demo app with different themes:

   GTK_THEME=EvoPop snap run gtk3-demo
   GTK_THEME=Adwaita snap run gtk3-demo

adwaita-theme-snapcraft.yaml

name: adwaita-theme
version: '0.1'
architectures:
  - all
summary: "Adwaita: GNOME's default theme"
description: |
  This is my-snap's description. You have a paragraph or two to tell the
  most important story about your snap. Keep it under 100 words though,
  we live in tweetspace and your description wants to look good in the snap
  store.

grade: devel # must be 'stable' to release into candidate/stable channels
confinement: strict

slots:
  gtk3-themes:
    interface: content
    source:
      read:
        - $SNAP/themes/Adwaita
        - $SNAP/themes/Adwaita-dark

  icon-themes:
    interface: content
    source:
      read:
        - $SNAP/icons/Adwaita

parts:
  adwaita-theme:
    plugin: nil
    stage-packages:
      - adwaita-icon-theme-full
      - gnome-themes-standard-data
    build-packages:
      - gtk-update-icon-cache
    install: |
      set -eux
      for dir in $SNAPCRAFT_PART_INSTALL/usr/share/icons/*; do
        if [ -f "$dir/index.theme" ]; then
          gtk-update-icon-cache --force "$dir"
        fi
      done
    organize:
      usr/share/themes: themes
      usr/share/icons: icons
    stage:
      - icons/Adwaita
      - themes/*/gtk-3*

evopop-theme-snapcraft.yaml

name: evopop-theme
version: '2.9.99'
architectures:
  - all
summary: EvoPop is a modern desktop theme suite.
description: |
  EvoPop is a modern desktop theme suite. Its design is mostly flat
  with a minimal use of shadows for depth. Requires Gtk 3.20 to
  function properly. The theme is primarily build for the Solus
  Project.

grade: devel # must be 'stable' to release into candidate/stable channels
confinement: strict

slots:
  gtk3-themes:
    interface: content
    source:
      read:
        - $SNAP/themes/EvoPop
        - $SNAP/themes/EvoPop-Azure

parts:
  evopop-gtk-theme:
    source: https://github.com/solus-project/evopop-gtk-theme.git
    source-type: git
    plugin: dump
    organize:
      EvoPop: themes/EvoPop
      EvoPop-Azure: themes/EvoPop-Azure
    stage:
      - themes/*/gtk-3*

gtk3-demo-snapcraft.yaml

name: gtk3-demo
version: '0.1'
summary: Single-line elevator pitch for your amazing snap # 79 char long summary
description: |
  This is my-snap's description. You have a paragraph or two to tell the
  most important story about your snap. Keep it under 100 words though,
  we live in tweetspace and your description wants to look good in the snap
  store.

grade: devel # must be 'stable' to release into candidate/stable channels
confinement: strict

plugs:
  gnome-3-26-1604:
    interface: content
    target: $SNAP/gnome-platform
    default-provider: gnome-3-26-1604:gnome-3-26-1604
  gtk3-themes:
    interface: content
    target: $SNAP/share/themes
  icon-themes:
    interface: content
    target: $SNAP/share/icons

apps:
  gtk3-demo:
    command: bin/desktop-launch $SNAP/bin/run-gtk3-demo.sh
    plugs:
      - desktop
      - wayland
      - x11
      - gtk3-themes
      - icon-themes

parts:
  app:
    after:
      - desktop-gnome-platform
    plugin: nil
    build-attributes:
      - no-system-libraries
    stage-packages:
      - gtk-3-examples
    install: |
      set -ex
      mkdir -p $SNAPCRAFT_PART_INSTALL/share/themes
      mkdir -p $SNAPCRAFT_PART_INSTALL/share/icons
      mkdir $SNAPCRAFT_PART_INSTALL/bin
      echo '#!/bin/sh' > $SNAPCRAFT_PART_INSTALL/bin/run-gtk3-demo.sh
      echo 'export XDG_DATA_DIRS="$SNAP/share:$XDG_DATA_DIRS"' >> $SNAPCRAFT_PART_INSTALL/bin/run-gtk3-demo.sh
      echo 'exec $SNAP/usr/bin/gtk3-demo' >> $SNAPCRAFT_PART_INSTALL/bin/run-gtk3-demo.sh
      chmod a+x $SNAPCRAFT_PART_INSTALL/bin/run-gtk3-demo.sh
    stage:
      - usr/bin/gtk3-demo
      - bin/run-gtk3-demo.sh
      - share/icons
      - share/themes

ubuntu-themes-snapcraft.yaml

name: ubuntu-themes
version: '0.1' # just for humans, typically '1.2+git' or '1.3.2'
architectures:
  - all
summary: Ubuntu Light Themes (Ambiance and Radiance)
description: |
  Includes matching Ambiance and Radiance themes

  * Ambiance is a light-on-dark theme
  * Radiance is a dark-on-light theme

  Introduced as the default themes in Ubuntu 10.04 LTS.

grade: devel
confinement: strict

slots:
  gtk3-themes:
    interface: content
    source:
      read:
        - $SNAP/themes/Ambiance
        - $SNAP/themes/Radiance

  icon-themes:
    interface: content
    source:
      read:
        - $SNAP/icons/ubuntu-mono-dark
        - $SNAP/icons/ubuntu-mono-light
        - $SNAP/icons/Humanity
        - $SNAP/icons/Humanity-Dark

parts:
  light-themes:
    plugin: nil
    stage-packages:
      - light-themes
    build-packages:
      - gtk-update-icon-cache
    install: |
      set -eux
      for dir in $SNAPCRAFT_PART_INSTALL/usr/share/icons/*; do
        if [ -f "$dir/index.theme" ]; then
          gtk-update-icon-cache --force "$dir"
        fi
      done
    organize:
      usr/share/themes: themes
      usr/share/icons: icons
    stage:
      - icons/ubuntu-mono-dark
      - icons/ubuntu-mono-light
      - icons/Humanity
      - icons/Humanity-Dark
      - themes/*/gtk-3*

Gracias