Merge pull request #165 from hugoholgersson/mac_os_port

Port of Diffuse to macOS

.markdownlint.json

@@ -0,0 +1,6 @@
+{
+    "default": true,
+    "no-duplicate-heading": false,
+    "no-inline-html": false,
+    "no-emphasis-as-heading": false
+}

data/icons/meson.build

@@ -11,3 +11,7 @@ install_data(
   join_paths(symbolic_dir, ('@0@-symbolic.svg').format(application_id)),
   install_dir: join_paths(get_option('datadir'), 'icons', symbolic_dir)
 )
+
+if build_machine.system() == 'darwin'
+  install_data('diffuse.icns', install_dir: '/Applications/Diffuse.app/Contents/Resources')
+endif

data/meson.build

@@ -1,34 +1,36 @@
 pkgdatadir = join_paths(get_option('prefix'), get_option('datadir'), meson.project_name())
 
-desktop_file = i18n.merge_file(
+if build_machine.system() == 'linux'
+  desktop_file = i18n.merge_file(
     input: 'io.github.mightycreak.Diffuse.desktop.in',
     output: 'io.github.mightycreak.Diffuse.desktop',
     type: 'desktop',
     po_dir: '../po',
     install: true,
     install_dir: join_paths(get_option('datadir'), 'applications')
-)
+  )
 
-desktop_utils = find_program('desktop-file-validate', required: false)
+  desktop_utils = find_program('desktop-file-validate', required: false)
-if desktop_utils.found()
+  if desktop_utils.found()
     test('Validate desktop file', desktop_utils,
       args: [desktop_file]
     )
-endif
+  endif
 
-appstream_file = i18n.merge_file(
+  appstream_file = i18n.merge_file(
     input: 'io.github.mightycreak.Diffuse.appdata.xml.in',
     output: 'io.github.mightycreak.Diffuse.appdata.xml',
     po_dir: '../po',
     install: true,
     install_dir: join_paths(get_option('datadir'), 'appdata')
-)
+  )
 
-appstream_util = find_program('appstream-util', required: false)
+  appstream_util = find_program('appstream-util', required: false)
-if appstream_util.found()
+  if appstream_util.found()
     test('Validate appstream file', appstream_util,
       args: ['validate', appstream_file]
     )
+  endif
 endif
 
 # Diffuse config file

docs/developers/developers-setup.md

@@ -8,13 +8,14 @@ Diffuse depends on these projects:
 * PyPi
 * Cairo and GObject Introspection development headers
 * Meson
-* Flatpak and Flatpak builder
+* Flatpak and Flatpak builder (Linux only)
 
-### Install the distribution dependencies
+## Install the dependencies
 
-It's a bit difficult to get the command lines for all the distributions and
+### Install the system dependencies
-their releases, but it should be enough to find the packages on other
+
-distributions.
+It's a bit difficult to get the command lines for all the systems, but these
+examples should be enough to find the packages on most systems.
 
 <details>
     <summary>Debian/Ubuntu</summary>
@@ -32,7 +33,19 @@ _Note: Tested on Debian 11 (Buster) and Ubuntu 20.04 (Focal)_
 sudo dnf install python-pip cairo-devel cairo-gobject-devel meson flatpak flatpak-builder
 ```
 
-_Note: Tested on Fedora 34_
+_Note: Tested on Fedora 36_
+</details>
+
+<details>
+    <summary>Mac OS</summary>
+
+On Mac, all dependencies can be installed using [Homebrew](https://docs.brew.sh/):
+
+```sh
+brew install meson python3 py3cairo pygobject3 gtk+3 librsvg
+```
+
+_Note: Tested on macOS 12.5 (Monterey)_
 </details>
 
 ### Install the project dependencies
@@ -49,34 +62,42 @@ For developer tools, run this one instead (it includes requirements.txt):
 pip install -r requirements.dev.txt
 ```
 
-## Setup on Linux
+## Setup
 
-### Build, test and install using Flatpak
+### Setup on Linux using Flatpak
 
-To install Diffuse locally:
+#### Build, test and install
+
+To build, test and install Diffuse locally:
 
 ```sh
 flatpak install runtime/org.gnome.Sdk/$(uname -p)/42
 flatpak-builder --user --install build-flatpak io.github.mightycreak.Diffuse.yml
 ```
 
+#### Run
+
 To run Diffuse through Flatpak:
 
 ```sh
 flatpak run io.github.mightycreak.Diffuse
 ```
 
+#### Uninstall
+
 To uninstall Diffuse:
 
 ```sh
 flatpak remove io.github.mightycreak.Diffuse
 ```
 
-### Build, test and install using Meson
+### Setup on Linux using Meson
 
-Diffuse build system is meson.
+#### Build and test
 
-To compile and test Diffuse:
+Diffuse is using Meson as its build system.
+
+To build and test Diffuse:
 
 ```sh
 meson setup build
@@ -85,36 +106,81 @@ meson compile
 meson test
 ```
 
+#### Install on system and run
+
 To install Diffuse on your system (e.g. `/usr/local/`):
 
 ```sh
 meson install # requires admin privileges
+```
 
-# Run Diffuse
+To run Diffuse:
+
+```sh
 diffuse
 ```
 
-To install Diffuse on a custom directory (e.g. `~/bin/diffuse`):
+#### Install in a custom directory and run
+
+Meson allows to change the default installation directories, see
+[command-line documentation](https://mesonbuild.com/Commands.html#configure).
+
+To install Diffuse in a custom directory (e.g. `~/bin/diffuse`):
 
 ```sh
 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:
+To run Diffuse:
+
+```sh
+export PYTHONPATH=$HOME/bin/diffuse/usr/local/share/diffuse
+cd ~/bin/diffuse/usr/local/bin
+./diffuse
+```
+
+#### Uninstall
+
+To uninstall Diffuse afterwards:
 
 ```sh
 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
+### Setup on Mac OS
-[command-line documentation](https://mesonbuild.com/Commands.html#configure).
 
-## Setup on Windows
+#### Build and test
+
+Diffuse is using Meson as its build system.
+
+To build and test Diffuse:
+
+```sh
+meson setup build
+cd build
+meson compile
+meson test
+```
+
+#### Install on system and run
+
+To install Diffuse on your system (e.g. `/usr/local/`):
+
+```sh
+meson install # requires admin privileges
+```
+
+To run Diffuse:
+
+```sh
+diffuse
+```
+
+_Note: The `diffuse` command can be used to launch Diffuse as a native Mac app_
+_that is installed into `/Applications/Diffuse.app`._
+
+### Setup on Windows (deprecated)
 
 _Note:_ The Windows port is not maintained and would need some love.
 Contributions are very welcome! 😉

docs/developers/release-process.md

@@ -19,16 +19,16 @@ few manual steps.
    - data/usr/share/gnome/help/diffuse/*/diffuse.xml
    - data/usr/share/omf/diffuse/diffuse-*.omf
    - utils/book2manual.xsl
-3. Update CHANGELOG.md
+4. Update CHANGELOG.md
    - Add new line under `## Unreleased` following this syntax: `## x.y.z - YYYY-MM-DD`
    - Copy the content of the changes for this release
-4. Update AppData release notes in data/io.github.mightycreak.Diffuse.appdata.xml.in:
+5. Update AppData release notes in data/io.github.mightycreak.Diffuse.appdata.xml.in:
    - Create a new `<release>` tag under `<releases>`, fill the `version` and
      `date` attributes
    - Create a new `<description>` tag under the new `<release>` tag
    - Add one paragraph to sum the release in one sentence (e.g. highlights, ...)
    - Paste the changes from the changelog and adapt it to HTML
-5. Create new branch and PR
+6. Create new branch and PR
 
 ## Create new release on GitHub
 

docs/translators.md

@@ -70,6 +70,7 @@ Use `update-translations.py` to validate one or more PO files.
 Here is an example with `ja.po` and `ko.po`:
 
 Command-line:
+
 ```sh
 ./update-translations.py --check-only ja.po ko.po
 ```
@@ -99,8 +100,10 @@ POSIX platforms. The conversion tools insert some English text that gets
 localized using search and replace. Manually add new search and replace rules
 to these files:
 
-    ../windows-installer/translations.txt
+```text
-    ../utils/translations.txt
+../windows-installer/translations.txt
+../utils/translations.txt
+```
 
 The format of each line is: \<language id\>:\<English text\>:\<localised text\>
 

docs/users.md

@@ -22,3 +22,12 @@ The Diffuse package statuses for every distributions can been seen on
 
 Huge thanks to [@bongochong](https://github.com/bongochong) for maintaining the
 Diffuse package on Fedora.
+
+## Integrate with Git
+
+Diffuse is compatible with `git difftool` command-line. To use Diffuse as Git
+diff tool, run:
+
+```sh
+git config --global diff.tool diffuse
+```

meson.build

@@ -10,4 +10,6 @@ subdir('data')
 subdir('src')
 subdir('po')
 
-meson.add_install_script('build-aux/meson/postinstall.py')
+if build_machine.system() == 'linux'
+  meson.add_install_script('build-aux/meson/postinstall.py')
+endif

src/diffuse/mac-os-app/Info.plist.in

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>English</string>
+    <key>CFBundleExecutable</key>
+    <string>mac_launcher.sh</string>
+    <key>CFBundleIconFile</key>
+    <string>diffuse.icns</string>
+    <key>CFBundleIdentifier</key>
+    <string>io.github.mightycreak.Diffuse</string>
+    <key>CFBundleName</key>
+    <string>Diffuse</string>
+    <key>CFBundleShortVersionString</key>
+    <string>@VERSION@</string>
+    <key>CFBundlePackageType</key>
+    <string>APPL</string>
+    <key>NSAppleScriptEnabled</key>
+    <string>NO</string>
+</dict>
+</plist>

src/diffuse/mac-os-app/diffuse-mac.in

@@ -0,0 +1,14 @@
+#!/bin/bash
+#
+# This is the command-line entry point on Mac.
+#
+# We want to use Mac's `open` command for mainly two reasons;
+# a) open lets us choose our own icon.
+# b) open puts the app on top of the other windows, including the terminal we ran this from.
+#
+# --new lets us open multiple windows.
+# --wait-apps lets Diffuse be a "git difftool", letting Diffuse run before git deletes its tmp files.
+#
+# We pass "pwd" because Mac's `open` command launches processes at '/'.
+# "printf %q" escapes spaces and other characters so the complete dir is passed as one.
+open /Applications/Diffuse.app --new --wait-apps --args $(printf %q "$(pwd)") $@

src/diffuse/mac-os-app/mac_launcher.sh.in

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# Mac's `open` command resets working dir. This extra script only
+# does `cd` back to the dir from which `diffuse` was launched to
+# allow Python to pick up any relative paths given by `git difftool`.
+cd $1
+@BINDIR@/diffuse_impl ${@:2}

src/diffuse/meson.build

@@ -9,15 +9,40 @@ conf.set('VERSION', meson.project_version())
 conf.set('PKGDATADIR', pkgdatadir)
 conf.set('LOCALEDIR', join_paths(get_option('prefix'), get_option('localedir')))
 conf.set('SYSCONFIGDIR', join_paths(get_option('prefix'), get_option('sysconfdir')))
+conf.set('BINDIR', join_paths(get_option('prefix'), get_option('bindir')))
 
 configure_file(
   input: 'diffuse.in',
-  output: 'diffuse',
+  output: build_machine.system() == 'darwin' ? 'diffuse_impl' : 'diffuse',
   configuration: conf,
   install: true,
   install_dir: get_option('bindir')
 )
 
+if build_machine.system() == 'darwin'
+  configure_file(
+    input: 'mac-os-app/diffuse-mac.in',
+    output: 'diffuse',
+    configuration: conf,
+    install: true,
+    install_dir: get_option('bindir')
+  )
+  configure_file(
+    input: 'mac-os-app/mac_launcher.sh.in',
+    output: 'mac_launcher.sh',
+    configuration: conf,
+    install: true,
+    install_dir: '/Applications/Diffuse.app/Contents/MacOS'
+  )
+  configure_file(
+    input: 'mac-os-app/Info.plist.in',
+    output: 'Info.plist',
+    configuration: conf,
+    install: true,
+    install_dir: '/Applications/Diffuse.app/Contents'
+  )
+endif
+
 diffuse_sources = [
   '__init__.py',
   'constants.py',

src/diffuse/resources.py

@@ -26,6 +26,7 @@
 
 import glob
 import os
+import platform
 import re
 import shlex
 
@@ -43,36 +44,37 @@ from gi.repository import Gdk  # type: ignore # noqa: E402
 class Resources:
     def __init__(self):
         # default keybindings
+        defaultModKey = 'Cmd+' if platform.system() == 'Darwin' else 'Ctrl+'
         self.keybindings = {}
         self.keybindings_lookup = {}
-        self.setKeyBinding('menu', 'open_file', 'Ctrl+o')
+        self.setKeyBinding('menu', 'open_file', defaultModKey + 'o')
-        self.setKeyBinding('menu', 'open_file_in_new_tab', 'Ctrl+t')
+        self.setKeyBinding('menu', 'open_file_in_new_tab', defaultModKey + 't')
         self.setKeyBinding('menu', 'open_modified_files', 'Shift+Ctrl+O')
         self.setKeyBinding('menu', 'open_commit', 'Shift+Ctrl+T')
         self.setKeyBinding('menu', 'reload_file', 'Shift+Ctrl+R')
-        self.setKeyBinding('menu', 'save_file', 'Ctrl+s')
+        self.setKeyBinding('menu', 'save_file', defaultModKey + 's')
-        self.setKeyBinding('menu', 'save_file_as', 'Shift+Ctrl+A')
+        self.setKeyBinding('menu', 'save_file_as', defaultModKey + 'Shift+A')
-        self.setKeyBinding('menu', 'save_all', 'Shift+Ctrl+S')
+        self.setKeyBinding('menu', 'save_all', defaultModKey + 'Shift+S')
         self.setKeyBinding('menu', 'new_2_way_file_merge', 'Ctrl+2')
         self.setKeyBinding('menu', 'new_3_way_file_merge', 'Ctrl+3')
         self.setKeyBinding('menu', 'new_n_way_file_merge', 'Ctrl+4')
-        self.setKeyBinding('menu', 'close_tab', 'Ctrl+w')
+        self.setKeyBinding('menu', 'close_tab', defaultModKey + 'w')
-        self.setKeyBinding('menu', 'undo_close_tab', 'Shift+Ctrl+W')
+        self.setKeyBinding('menu', 'undo_close_tab', defaultModKey + 'Shift+W')
-        self.setKeyBinding('menu', 'quit', 'Ctrl+q')
+        self.setKeyBinding('menu', 'quit', defaultModKey + 'q')
-        self.setKeyBinding('menu', 'undo', 'Ctrl+z')
+        self.setKeyBinding('menu', 'undo', defaultModKey + 'z')
-        self.setKeyBinding('menu', 'redo', 'Shift+Ctrl+Z')
+        self.setKeyBinding('menu', 'redo', defaultModKey + 'Shift+Z')
-        self.setKeyBinding('menu', 'cut', 'Ctrl+x')
+        self.setKeyBinding('menu', 'cut', defaultModKey + 'x')
-        self.setKeyBinding('menu', 'copy', 'Ctrl+c')
+        self.setKeyBinding('menu', 'copy', defaultModKey + 'c')
-        self.setKeyBinding('menu', 'paste', 'Ctrl+v')
+        self.setKeyBinding('menu', 'paste', defaultModKey + 'v')
-        self.setKeyBinding('menu', 'select_all', 'Ctrl+a')
+        self.setKeyBinding('menu', 'select_all', defaultModKey + 'a')
-        self.setKeyBinding('menu', 'clear_edits', 'Ctrl+r')
+        self.setKeyBinding('menu', 'clear_edits', defaultModKey + 'r')
-        self.setKeyBinding('menu', 'dismiss_all_edits', 'Ctrl+d')
+        self.setKeyBinding('menu', 'dismiss_all_edits', defaultModKey + 'd')
-        self.setKeyBinding('menu', 'find', 'Ctrl+f')
+        self.setKeyBinding('menu', 'find', defaultModKey + 'f')
-        self.setKeyBinding('menu', 'find_next', 'Ctrl+g')
+        self.setKeyBinding('menu', 'find_next', defaultModKey + 'g')
-        self.setKeyBinding('menu', 'find_previous', 'Shift+Ctrl+G')
+        self.setKeyBinding('menu', 'find_previous', defaultModKey + 'Shift+G')
-        self.setKeyBinding('menu', 'go_to_line', 'Shift+Ctrl+L')
+        self.setKeyBinding('menu', 'go_to_line', defaultModKey + 'Shift+l')
-        self.setKeyBinding('menu', 'realign_all', 'Ctrl+l')
+        self.setKeyBinding('menu', 'realign_all', defaultModKey + 'l')
-        self.setKeyBinding('menu', 'isolate', 'Ctrl+i')
+        self.setKeyBinding('menu', 'isolate', defaultModKey + 'i')
         self.setKeyBinding('menu', 'first_difference', 'Shift+Ctrl+Up')
         self.setKeyBinding('menu', 'previous_difference', 'Ctrl+Up')
         self.setKeyBinding('menu', 'next_difference', 'Ctrl+Down')
@@ -83,24 +85,24 @@ class Resources:
         self.setKeyBinding('menu', 'last_tab', 'Shift+Ctrl+Page_Down')
         self.setKeyBinding('menu', 'shift_pane_right', 'Shift+Ctrl+parenright')
         self.setKeyBinding('menu', 'shift_pane_left', 'Shift+Ctrl+parenleft')
-        self.setKeyBinding('menu', 'convert_to_upper_case', 'Ctrl+u')
+        self.setKeyBinding('menu', 'convert_to_upper_case', defaultModKey + 'u')
-        self.setKeyBinding('menu', 'convert_to_lower_case', 'Shift+Ctrl+U')
+        self.setKeyBinding('menu', 'convert_to_lower_case', defaultModKey + 'Shift+U')
-        self.setKeyBinding('menu', 'sort_lines_in_ascending_order', 'Ctrl+y')
+        self.setKeyBinding('menu', 'sort_lines_in_ascending_order', defaultModKey + 'y')
-        self.setKeyBinding('menu', 'sort_lines_in_descending_order', 'Shift+Ctrl+Y')
+        self.setKeyBinding('menu', 'sort_lines_in_descending_order', defaultModKey + 'Shift+Y')
-        self.setKeyBinding('menu', 'remove_trailing_white_space', 'Ctrl+k')
+        self.setKeyBinding('menu', 'remove_trailing_white_space', defaultModKey + 'k')
-        self.setKeyBinding('menu', 'convert_tabs_to_spaces', 'Ctrl+b')
+        self.setKeyBinding('menu', 'convert_tabs_to_spaces', defaultModKey + 'b')
         self.setKeyBinding('menu', 'convert_leading_spaces_to_tabs', 'Shift+Ctrl+B')
-        self.setKeyBinding('menu', 'increase_indenting', 'Shift+Ctrl+greater')
+        self.setKeyBinding('menu', 'increase_indenting', defaultModKey + 'Shift+greater')
-        self.setKeyBinding('menu', 'decrease_indenting', 'Shift+Ctrl+less')
+        self.setKeyBinding('menu', 'decrease_indenting', defaultModKey + 'Shift+less')
-        self.setKeyBinding('menu', 'convert_to_dos', 'Shift+Ctrl+E')
+        self.setKeyBinding('menu', 'convert_to_dos', defaultModKey + 'Shift+E')
-        self.setKeyBinding('menu', 'convert_to_mac', 'Shift+Ctrl+C')
+        self.setKeyBinding('menu', 'convert_to_mac', defaultModKey + 'Shift+C')
-        self.setKeyBinding('menu', 'convert_to_unix', 'Ctrl+e')
+        self.setKeyBinding('menu', 'convert_to_unix', defaultModKey + 'e')
-        self.setKeyBinding('menu', 'copy_selection_right', 'Shift+Ctrl+Right')
+        self.setKeyBinding('menu', 'copy_selection_right', defaultModKey + 'Shift+Right')
-        self.setKeyBinding('menu', 'copy_selection_left', 'Shift+Ctrl+Left')
+        self.setKeyBinding('menu', 'copy_selection_left', defaultModKey + 'Shift+Left')
-        self.setKeyBinding('menu', 'copy_left_into_selection', 'Ctrl+Right')
+        self.setKeyBinding('menu', 'copy_left_into_selection', defaultModKey + 'Right')
-        self.setKeyBinding('menu', 'copy_right_into_selection', 'Ctrl+Left')
+        self.setKeyBinding('menu', 'copy_right_into_selection', defaultModKey + 'Left')
-        self.setKeyBinding('menu', 'merge_from_left_then_right', 'Ctrl+m')
+        self.setKeyBinding('menu', 'merge_from_left_then_right', defaultModKey + 'm')
-        self.setKeyBinding('menu', 'merge_from_right_then_left', 'Shift+Ctrl+M')
+        self.setKeyBinding('menu', 'merge_from_right_then_left', defaultModKey + 'Shift+M')
         self.setKeyBinding('menu', 'help_contents', 'F1')
         self.setKeyBinding('line_mode', 'enter_align_mode', 'space')
         self.setKeyBinding('line_mode', 'enter_character_mode', 'Return')
@@ -126,13 +128,13 @@ class Resources:
         self.setKeyBinding('line_mode', 'right', 'l')
         self.setKeyBinding('line_mode', 'extend_right', 'Shift+Right')
         self.setKeyBinding('line_mode', 'page_up', 'Page_Up')
-        self.setKeyBinding('line_mode', 'page_up', 'Ctrl+u')
+        self.setKeyBinding('line_mode', 'page_up', defaultModKey + 'u')
         self.setKeyBinding('line_mode', 'extend_page_up', 'Shift+Page_Up')
-        self.setKeyBinding('line_mode', 'extend_page_up', 'Shift+Ctrl+U')
+        self.setKeyBinding('line_mode', 'extend_page_up', defaultModKey + 'Shift+U')
         self.setKeyBinding('line_mode', 'page_down', 'Page_Down')
-        self.setKeyBinding('line_mode', 'page_down', 'Ctrl+d')
+        self.setKeyBinding('line_mode', 'page_down', defaultModKey + 'd')
         self.setKeyBinding('line_mode', 'extend_page_down', 'Shift+Page_Down')
-        self.setKeyBinding('line_mode', 'extend_page_down', 'Shift+Ctrl+D')
+        self.setKeyBinding('line_mode', 'extend_page_down', defaultModKey + 'Shift+D')
         self.setKeyBinding('line_mode', 'delete_text', 'BackSpace')
         self.setKeyBinding('line_mode', 'delete_text', 'Delete')
         self.setKeyBinding('line_mode', 'delete_text', 'x')
@@ -165,9 +167,9 @@ class Resources:
         self.setKeyBinding('align_mode', 'right', 'Right')
         self.setKeyBinding('align_mode', 'right', 'l')
         self.setKeyBinding('align_mode', 'page_up', 'Page_Up')
-        self.setKeyBinding('align_mode', 'page_up', 'Ctrl+u')
+        self.setKeyBinding('align_mode', 'page_up', defaultModKey + 'u')
         self.setKeyBinding('align_mode', 'page_down', 'Page_Down')
-        self.setKeyBinding('align_mode', 'page_down', 'Ctrl+d')
+        self.setKeyBinding('align_mode', 'page_down', defaultModKey + 'd')
         self.setKeyBinding('character_mode', 'enter_line_mode', 'Escape')
 
         # default colours
@@ -232,6 +234,8 @@ class Resources:
                 modifiers |= Gdk.ModifierType.SHIFT_MASK
             elif token == 'Ctrl':
                 modifiers |= Gdk.ModifierType.CONTROL_MASK
+            elif token == 'Cmd':
+                modifiers |= Gdk.ModifierType.META_MASK
             elif token == 'Alt':
                 modifiers |= Gdk.ModifierType.MOD1_MASK
             elif len(token) == 0 or token[0] == '_':

utils/makemacicon.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+# Use this tool if you need to re-create
+# Diffuse.app/Contents/Resources/diffuse.icns
+# in case the icon changes (unlikely).
+
+sizes=(16 32 64 128 256 512)
+for s in "${sizes[@]}"; do
+  echo $s
+  rsvg-convert -h $s "$1" > "icon_${s}x$s.png"
+done
+
+cp 'icon_32x32.png'     'icon_16x16@2x.png'
+cp 'icon_64x64.png'     'icon_32x32@2x.png'
+cp 'icon_256x256.png'   'icon_128x128@2x.png'
+cp 'icon_512x512.png'   'icon_256x256@2x.png'
+
+mkdir icon.iconset
+mv icon_*x*.png icon.iconset
+iconutil -c icns icon.iconset