New build scripts for linux

Allow either portable build or local build, and clearly document the
two.

Fix root cause of #529.

README.md

@@ -128,15 +128,17 @@ cd sioyek
 
     Run `qmake --version` to make sure the `qmake` in path is using Qt 5.x.
 2. Install `libharfbuzz`:
-```
-sudo apt install libharfbuzz-dev
-```
-3. Clone the repository and build:
-```
-git clone --recursive https://github.com/ahrm/sioyek
-cd sioyek
-./build_linux.sh
-```
+    ```
+    sudo apt install libharfbuzz-dev
+    ```
+3. Clone the repository:
+    ```
+    git clone --recursive https://github.com/ahrm/sioyek
+    cd sioyek
+    ```
+4. Build it:
+	- If you want to build a portable version, call `./build_linux.sh portable`. All the files you need will be built under the `build/` subdirectory. You can move this directory around and sioyek will still work.
+	- If instead you want to install it locally on your system, run `/build_linux.sh local`. This will install sioyek under `/usr/bin`. NOTE: This will link sioyek against the mupdf and zlib libraries provided by your system, not the sioyek-supplied ones.
 
 ### Windows
 1. Install Visual Studio (tested on 2019, other relatively recent versions should work too)

build_linux.sh

@@ -1,11 +1,28 @@
 #!/usr/bin/env bash
 
+if [ -z $1 ];
+then
+	echo "Defaulting to portable build"
+	export MODE="portable"
+elif [ $1 == "local" ];
+then
+	echo "Local build"
+	export MODE="local"
+elif [ $1 == "portable" ];
+then
+	echo "Portable build"
+	export MODE="portable"
+else
+	echo "Call with 'local' for a local build, or with 'portable' for a portable build"
+	exit
+fi
+
 # Compile mupdf
 cd mupdf
 make USE_SYSTEM_HARFBUZZ=yes
 cd ..
 
-# Compile sioyek
+# Get qmake path
 if [ -f "/usr/bin/qmake-qt5" ]; 
 then
 	QMAKE="/usr/bin/qmake-qt5"
@@ -16,16 +33,29 @@ else
 	QMAKE="qmake"
 fi
 
-$QMAKE "CONFIG+=linux_app_image" pdf_viewer_build_config.pro
-make
+# Clean old build
+make clean
+rm Makefile
+
+# Local build
+if [ $MODE == "local" ];
+then
+	$QMAKE pdf_viewer_build_config.pro
+	make
+	sudo make install
+elif [ $MODE == "portable" ];
+then
+	$QMAKE "CONFIG+=linux_app_image" pdf_viewer_build_config.pro
+	make
+	# Copy files in build/ subdirectory
+	rm -r build 2> /dev/null
+	mkdir build
+	mv sioyek build/sioyek
+	cp pdf_viewer/prefs.config build/prefs.config
+	cp pdf_viewer/prefs_user.config build/prefs_user.config
+	cp pdf_viewer/keys.config build/keys.config
+	cp pdf_viewer/keys_user.config build/keys_user.config
+	cp -r pdf_viewer/shaders build/shaders
+	cp tutorial.pdf build/tutorial.pdf
+fi
 
-# Copy files in build/ subdirectory
-rm -r build 2> /dev/null
-mkdir build
-mv sioyek build/sioyek
-cp pdf_viewer/prefs.config build/prefs.config
-cp pdf_viewer/prefs_user.config build/prefs_user.config
-cp pdf_viewer/keys.config build/keys.config
-cp pdf_viewer/keys_user.config build/keys_user.config
-cp -r pdf_viewer/shaders build/shaders
-cp tutorial.pdf build/tutorial.pdf

pdf_viewer_build_config.pro

@@ -1,10 +1,7 @@
 TEMPLATE = app
 TARGET = sioyek
 VERSION = 2.0.0
-INCLUDEPATH += ./pdf_viewer\
-              mupdf/include \
-              zlib
-
+INCLUDEPATH += ./pdf_viewer
 
 QT += core opengl gui widgets network 3dinput openglextensions
 CONFIG += c++17
@@ -67,6 +64,7 @@ SOURCES += pdf_viewer/book.cpp \
 
 
 win32{
+    INCLUDEPATH += mupdf/include zlib
     DEFINES += _CRT_SECURE_NO_WARNINGS _CRT_NONSTDC_NO_DEPRECATE
     RC_ICONS = pdf_viewer\icon2.ico
     LIBS += -Lmupdf\platform\win32\x64\Release -llibmupdf -Lzlib -lzlib
@@ -79,8 +77,11 @@ unix:!mac {
     QMAKE_CXXFLAGS += -std=c++17
 
     CONFIG(linux_app_image){
+        INCLUDEPATH += mupdf/include zlib
         LIBS += -ldl -Lmupdf/build/release -lmupdf -lmupdf-third -lmupdf-threads -lharfbuzz -lz
-    } else {
+    }
+    else {
+        # We use mupdf and zlib provided by the system
         DEFINES += NON_PORTABLE
         DEFINES += LINUX_STANDARD_PATHS
         LIBS += -ldl -lmupdf -lmupdf-third -lgumbo -lharfbuzz -lfreetype -ljbig2dec -ljpeg -lmujs -lopenjp2 -lz
@@ -99,21 +100,22 @@ unix:!mac {
     tutorial.files = tutorial.pdf
     tutorial.path = $$PREFIX/share/sioyek/
     keys.files = pdf_viewer/keys.config
-    keys.path = $$PREFIX/etc/sioyek
+    keys.path = /etc/sioyek
     prefs.files = pdf_viewer/prefs.config
-    prefs.path = $$PREFIX/etc/sioyek
+    prefs.path = /etc/sioyek
     INSTALLS += target
     INSTALLS += shortcutfiles
     INSTALLS += icon
     INSTALLS += shaders
     INSTALLS += tutorial
     INSTALLS += keys
-    INSTALLS += prefs	
+    INSTALLS += prefs
     DISTFILES += resources/sioyek.desktop\
         resources/sioyek-icon-linux.png
 }
 
 mac {
+    INCLUDEPATH += mupdf/include zlib
     QMAKE_CXXFLAGS += -std=c++17
     LIBS += -ldl -Lmupdf/build/release -lmupdf -lmupdf-third -lmupdf-threads -lz
     CONFIG+=sdk_no_version_check