Contributed AppImage and .travis.yml support

.travis.yml

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+language: cpp
+compiler: gcc
+sudo: require
+dist: trusty
+
+script:
+  - ./autogen.sh
+  - ./configure --prefix=/usr
+  - make -j$(nproc)
+  - make check
+  - make install DESTDIR=$(readlink -f appdir) ; find appdir/
+  - rm -rf appdir/usr/include/ appdir/usr/lib/pkgconfig/ appdir/usr/lib/*.{a,la} # Don't bundle developer stuff
+  - sudo mv appdir/usr/lib/* /usr/local/lib/ # Workaround for https://github.com/probonopd/linuxdeployqt/issues/160
+  - mkdir -p appdir/usr/share/icons/hicolor/128x128/apps ; cp dist/qpdf.png appdir/usr/share/icons/hicolor/128x128/apps/
+  - mkdir -p appdir/usr/share/applications ; cp dist/qpdf.desktop appdir/usr/share/applications/
+  - wget -c "https://github.com/probonopd/linuxdeployqt/releases/download/continuous/linuxdeployqt-continuous-x86_64.AppImage"
+  - chmod a+x linuxdeployqt*.AppImage
+  - unset QTDIR; unset QT_PLUGIN_PATH ; unset LD_LIBRARY_PATH
+  - export LD_LIBRARY_PATH=/usr/local/lib/ # Workaround for https://github.com/probonopd/linuxdeployqt/issues/160
+  - ./linuxdeployqt*.AppImage ./appdir/usr/share/applications/*.desktop -bundle-non-qt-libs
+  - # In addition to the main executable, we have additional ones to process
+  - # ./linuxdeployqt*.AppImage ./appdir/usr/bin/fix-qdf -bundle-non-qt-libs # Not an ELF?
+  - ./linuxdeployqt*.AppImage ./appdir/usr/bin/zlib-flate -bundle-non-qt-libs
+  - # Generate AppImage
+  - ./linuxdeployqt*.AppImage --appimage-extract
+  - rm ./appdir/AppRun ; cp dist/AppRun appdir/ ; chmod a+x ./appdir/AppRun # Replace symlink with custom script
+  - PATH=./squashfs-root/usr/bin:$PATH ./squashfs-root/usr/bin/appimagetool ./appdir/
+
+after_success:
+  - find ./appdir -executable -type f -exec ldd {} \; | grep " => /usr" | cut -d " " -f 2-3 | sort | uniq
+  - curl --upload-file ./QPDF*.AppImage https://transfer.sh/QPDF-git.$(git rev-parse --short HEAD)-x86_64.AppImage

dist/AppRun

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+#!/bin/bash
+
+# The purpose of this custom AppRun script is
+# to allow symlinking the AppImage and invoking
+# the corresponding binary depending on which
+# symlink was used to invoke the AppImage
+
+HERE="$(dirname "$(readlink -f "${0}")")"
+
+if [ ! -z $APPIMAGE ] ; then
+  BINARY_NAME=$(basename "$ARGV0")
+  if [ -e "$HERE/usr/bin/$BINARY_NAME" ] ; then
+    exec "$HERE/usr/bin/$BINARY_NAME" "$@"
+  else
+    exec "$HERE/usr/bin/qpdf" "$@"
+  fi
+else
+  exec "$HERE/usr/bin/qpdf" "$@"
+fi

dist/qpdf.desktop

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+[Desktop Entry]
+Type=Application
+Terminal=true
+Exec=qpdf
+Name=QPDF
+Comment=Structural, content-preserving transformations on PDF files
+Icon=qpdf