chore: standardize build procedure

app/install.sh

@@ -1,18 +1,23 @@
 #!/bin/env bash
 
+set -euo pipefail
+
+prefix=${PREFIX:-/usr/local}
+
 path="$(dirname "$(readlink -f "$0")")"
 
 cmake -S "$path/.." -B "$path/../build" \
-    -DCMAKE_BUILD_TYPE=Release \
-    -DCMAKE_INSTALL_PREFIX="$HOME"/.local || exit 1
+    -DCMAKE_INSTALL_PREFIX="$prefix"
 
-cmake --build "$path/../build" --target install || exit 1
+cmake --build "$path/../build"
 
-cp "$path/wallpaper-carousel.desktop" "$HOME"/.local/share/applications/wallpaper-carousel.desktop
-
-echo "Exec=$HOME/.local/bin/wallpaper-carousel" >>"$HOME"/.local/share/applications/wallpaper-carousel.desktop
-
-if command -v update-desktop-database &>/dev/null; then
-    update-desktop-database "$HOME"/.local/share/applications/
+if [ ! -w "$prefix" ] && [ "$(id -u)" -ne 0 ]; then
+    sudo cmake --install "$path/../build"
+else
+    cmake --install "$path/../build"
 fi
 
+if command -v update-desktop-database &>/dev/null; then
+    echo "Updating desktop database..."
+    update-desktop-database "$prefix"/share/applications/ || true
+fi