Docs and build fixes to run Diffuse on macOS

Here we strip away Linux-only stuff so devs
can create a local "Mac build".

There might be other Linux-only stuff that
are not needed on Mac still. Follow-ups are
welcome.

Author: hugoholgersson

data/meson.build

@@ -1,34 +1,36 @@
 pkgdatadir = join_paths(get_option('prefix'), get_option('datadir'), meson.project_name())
 
-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)
-if desktop_utils.found()
-  test('Validate desktop file', desktop_utils,
-    args: [desktop_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')
   )
-endif
 
-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)
-if appstream_util.found()
-  test('Validate appstream file', appstream_util,
-    args: ['validate', appstream_file]
+  desktop_utils = find_program('desktop-file-validate', required: false)
+  if desktop_utils.found()
+    test('Validate desktop file', desktop_utils,
+      args: [desktop_file]
+    )
+  endif
+
+  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)
+  if appstream_util.found()
+    test('Validate appstream file', appstream_util,
+      args: ['validate', appstream_file]
+    )
+  endif
 endif
 
 # Diffuse config file

docs/developers/developers-setup.md

@@ -8,7 +8,7 @@ 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
 
@@ -35,6 +35,20 @@ sudo dnf install python-pip cairo-devel cairo-gobject-devel meson flatpak flatpa
 _Note: Tested on Fedora 34_
 </details>
 
+<details>
+    <summary>Mac OS</summary>
+
+On Mac, all deps can be fetched using [Homebrew](https://docs.brew.sh/).
+
+```sh
+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.
+</details>
+
 ### Install the project dependencies
 
 To install the requirements just to execute the binary, run:
@@ -72,7 +86,7 @@ To uninstall Diffuse:
 flatpak remove io.github.mightycreak.Diffuse
 ```
 
-### Build, test and install using Meson
+## Build, test and install using Meson on Linux and Mac OS
 
 Diffuse build system is meson.
 

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