Set up appimage build.

scripts/build-appimage.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+set -x
+
+REPO_ROOT="$(readlink -f "$(dirname "$(dirname "$0")")")"
+OLD_CWD="$(readlink -f .)"
+BUILD_DIR="$REPO_ROOT/build/appimage"
+TOOLS_DIR="$BUILD_DIR/tools"
+
+if ! command -v qmake >/dev/null; then
+    echo "qmake not found in PATH." >&2
+    exit 1
+fi
+QTDIR="$(qmake -query QT_INSTALL_PREFIX)"
+QT_INSTALL_QML="$(qmake -query QT_INSTALL_QML)"
+
+APPDIR="$BUILD_DIR/AppDir"
+
+mkdir -p "$BUILD_DIR"
+rm -rf "$APPDIR"
+pushd "$BUILD_DIR"
+
+qmake "$REPO_ROOT/cool-retro-term.pro"
+make -j"$(nproc)"
+
+# Install targets from subprojects (the top-level install only installs the desktop file).
+make -C app install INSTALL_ROOT="$APPDIR"
+make -C qmltermwidget install INSTALL_ROOT="$APPDIR"
+make install INSTALL_ROOT="$APPDIR"
+
+popd
+
+# Relocate QMLTermWidget into the standard AppDir QML import path.
+QML_ROOT="$APPDIR$QT_INSTALL_QML"
+if [ -d "$QML_ROOT" ]; then
+    mkdir -p "$APPDIR/usr/qml"
+    rsync -a "$QML_ROOT/" "$APPDIR/usr/qml/"
+    rm -rf "$QML_ROOT"
+    QML_PARENT="$(dirname "$QML_ROOT")"
+    while [ "$QML_PARENT" != "$APPDIR" ] && rmdir "$QML_PARENT" 2>/dev/null; do
+        QML_PARENT="$(dirname "$QML_PARENT")"
+    done
+fi
+
+
+# Build AppImage using linuxdeploy and linuxdeploy-plugin-qt.
+mkdir -p "$TOOLS_DIR"
+LINUXDEPLOY="$TOOLS_DIR/linuxdeploy-x86_64.AppImage"
+LINUXDEPLOY_QT="$TOOLS_DIR/linuxdeploy-plugin-qt-x86_64.AppImage"
+if [ ! -x "$LINUXDEPLOY" ]; then
+    wget -c -O "$LINUXDEPLOY" https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
+    chmod +x "$LINUXDEPLOY"
+fi
+if [ ! -x "$LINUXDEPLOY_QT" ]; then
+    wget -c -O "$LINUXDEPLOY_QT" https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage
+    chmod +x "$LINUXDEPLOY_QT"
+fi
+
+export QML_SOURCES_PATHS="$REPO_ROOT/app"
+
+pushd "$BUILD_DIR"
+
+export EXTRA_PLATFORM_PLUGINS="libqwayland.so;"
+export EXTRA_QT_MODULES="sql;waylandcompositor;waylandclient"
+export DEPLOY_PLATFORM_THEMES=true
+export LINUXDEPLOY_EXCLUDED_LIBRARIES="libmysqlclient.so;libqsqlmimer.so;libqsqlmysql.so;libqsqlodbc.so;libqsqlpsql.so;libqsqloci.so;libqsqlibase.so"
+
+"$LINUXDEPLOY" \
+    --appdir "$APPDIR" \
+    -e "$APPDIR/usr/bin/cool-retro-term" \
+    -i "$REPO_ROOT/app/icons/256x256/cool-retro-term.png" \
+    -d "$REPO_ROOT/cool-retro-term.desktop" \
+    --plugin qt \
+    --output appimage
+
+mv ./*.AppImage "$OLD_CWD"
+popd