buildsystem: Move to meson for building the project

Meson will allow us to:
- Verify the used rust compiler is recent enough
- Install ressources such as a .desktop files, icons, etc.

README.md

@@ -24,27 +24,32 @@ $ flatpak install org.gnome.{Platform,Sdk}//40 org.freedesktop.Sdk.Extension.rus
 
 To compile and install as a flatpak, run
 ```shell
-$ flatpak-builder --install flatpak-build/ org.freedesktop.ryuukyu.Helvum.json
+$ flatpak-builder --install flatpak-build/ build-aux/org.freedesktop.ryuukyu.Helvum.json
 ```
 
 You can then run the app via
 ```shell
-flatpak run org.freedesktop.ryuukyu.Helvum
+$ flatpak run org.freedesktop.ryuukyu.Helvum
 ```
 
 ## Manually
 For compilation, you will need:
 
+- Meson
 - An up-to-date rust toolchain
 - `libclang-3.7` or higher
 - `gtk-4.0` and `pipewire-0.3` development headers
 
-To compile, run
+To compile and install, run
 
-    $ cargo build --release
+```shell
+$ meson setup build && cd build
+$ meson compile
+$ meson install
+```
 
 in the repository root.
-The resulting binary will be at `target/release/helvum`.
+This will install the compiled project files into `/usr/local`.
 
 # License
 Helvum is distributed under the terms of the GPL3 license.

build-aux/cargo.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+export MESON_BUILD_ROOT="$1"
+export MESON_SOURCE_ROOT="$2"
+export CARGO_TARGET_DIR="$MESON_BUILD_ROOT"/target
+export CARGO_HOME="$MESON_BUILD_ROOT"/cargo-home
+
+if [[ $4 = "development" ]]
+then
+    echo "DEBUG MODE"
+    cargo build --manifest-path \
+        "$MESON_SOURCE_ROOT"/Cargo.toml && \
+        cp "$CARGO_TARGET_DIR"/debug/$5 $3
+else
+    echo "RELEASE MODE"
+    cargo build --manifest-path \
+        "$MESON_SOURCE_ROOT"/Cargo.toml --release && \
+        cp "$CARGO_TARGET_DIR"/release/$5 $3
+fi
+

build-aux/org.freedesktop.ryuukyu.Helvum.json

@@ -3,7 +3,9 @@
     "runtime": "org.gnome.Platform",
     "runtime-version": "40",
     "sdk": "org.gnome.Sdk",
-    "sdk-extensions": ["org.freedesktop.Sdk.Extension.rust-stable"],
+    "sdk-extensions": [
+        "org.freedesktop.Sdk.Extension.rust-stable"
+    ],
     "command": "helvum",
     "finish-args": [
         "--socket=fallback-x11",
@@ -21,15 +23,15 @@
     "modules": [
         {
             "name": "Helvum",
-            "buildsystem": "simple",
+            "buildsystem": "meson",
-            "build-commands": [
-                "cargo install --path . --root /app --no-track"
-            ],
             "sources": [
                 {
                     "type": "dir",
-                    "path": "./"
+                    "path": "../"
                 }
+            ],
+            "config-opts": [
+                "-Dprofile=development"
             ]
         }
     ]

meson.build

@@ -0,0 +1,30 @@
+project(
+  'helvum',
+  'rust',
+  version: '0.3.0',
+  license: 'GPL-3.0',
+  meson_version: '>=0.50.0'
+)
+
+dependency('glib-2.0', version: '>= 2.48')
+dependency('gtk4',     version: '>= 4.0.0')
+dependency('libpipewire-0.3')
+
+rust_version = meson.get_compiler('rust').version()
+min_rust_version = '1.54.0'
+if rust_version < min_rust_version
+  error('Rust version too old: Required version is ' + min_rust_version + ' but actual version is ' + rust_version)
+endif
+
+cargo = find_program('cargo', required: true)
+cargo_script = find_program('build-aux/cargo.sh')
+
+prefix = get_option('prefix')
+bindir = prefix / get_option('bindir')
+
+cargo_sources = files(
+  'Cargo.toml',
+  'Cargo.lock',
+)
+
+subdir('src')

meson_options.txt

@@ -0,0 +1,11 @@
+option(
+  'profile',
+  type: 'combo',
+  choices: [
+    'default',
+    'development'
+  ],
+  value: 'default',
+  description: 'The build profile for Helvum. One of "default" or "development".'
+)
+

src/meson.build

@@ -0,0 +1,31 @@
+rust_sources = files(
+  'application.rs',
+  'main.rs',
+  'pipewire_connection.rs',
+  'pipewire_connection/state.rs',
+  'view/graph_view.rs',
+  'view/mod.rs',
+  'view/node.rs',
+  'view/port.rs',
+)
+
+custom_target(
+  'cargo-build',
+  build_by_default: true,
+  input: [
+    cargo_sources,
+    rust_sources
+  ],
+  output: meson.project_name(),
+  console: true,
+  install: true,
+  install_dir: bindir,
+  command: [
+    cargo_script,
+    meson.build_root(),
+    meson.source_root(),
+    '@OUTPUT@',
+    get_option('profile'),
+    meson.project_name(),
+  ],
+)