Add safeguards and automate MD installation from flatpak (fixes #1)

Author: harry-cpp

README.md

@@ -18,7 +18,7 @@ The installer will add "MonoDevelop Stable" application launcher, as well as the
 
 ## Building installer from source
 
-To build from source, simply download and install monodevelop from flatpak, and than just call the generate script:
+To build from source, simply download and install `flatpak`, and after than just call the generate script (it will automatically download and update MonoDevelop for you):
 ```
 ./generate.sh
 ```

generate.sh

@@ -1,14 +1,40 @@
 #!/bin/bash
 # https://github.com/fusion809/PKGBUILDs/releases
 
+# Check flatpak installed
+if ! type "flatpak" &> /dev/null
+then
+	echo "'flatpak' command not found :("
+	exit 1
+fi
+
+# Locate (and update) Monodevelop
 MDFDIR="$HOME/.local/share/flatpak/app/com.xamarin.MonoDevelop/current/active/files"
+MDU="$(flatpak list | grep com.xamarin.MonoDevelop | grep user)"
+MDS="$(flatpak list | grep com.xamarin.MonoDevelop | grep system)"
+
+if [ -n "$MDS" ]
+then
+	MDFDIR="/var/lib/flatpak/app/com.xamarin.MonoDevelop/current/active/files"
+	flatpak update com.xamarin.MonoDevelop
+elif [ -n "$MDU" ] 
+then
+	flatpak update --user com.xamarin.MonoDevelop
+else
+	flatpak install --user --from https://download.mono-project.com/repo/monodevelop.flatpakref
+fi
+
+if [ ! -d $MDFDIR ]
+then
+	echo "Could not locate MonoDevelop from flatpak, please make sure it is installed."
+	exit 1
+fi
 
 mkdir tmp
 cd tmp
 
-echo "Copying installer data..."
-
 # Copy installer source
+echo "Copying installer data..."
 mkdir installer
 cp -rf ../src/. installer
 
@@ -19,7 +45,7 @@ cp -rf $MDFDIR/lib/monodevelop/. installer/MonoDevelop
 rm -rf installer/MonoDevelop/AddIns/VersionControl/MonoDevelop.VersionControl.Git.dll
 
 echo "Building the Installer..."
-rm -f ../bin
+rm -rf ../bin
 mkdir ../bin
 ../makeself/makeself.sh installer/ ../bin/monodevelop.run "MonoDevelop .run installer" ./postinstall.sh