Create standalone Windows installer for cmdline.

This uses NullSoft Scriptable Install System to create the executable,
which is fully contained and downloads the necessary files, including
Java, from the internet. This prevents the installer itself from needing
to be updated on each update. Eventually, the installer should be
signed, but for now it's unsigned, causing various scary warnings upon
installation. In any case, the installer code itself works, as well as
the installer.

src/installer/Windows/README.md

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+This installer is written so that in general it shouldn't need updating.
+However, if it does need updating, you need the NSIS compiler. This can
+be found [here](https://sourceforge.net/projects/nsis/). You will also need the
+INetC plugin, found [here](http://nsis.sourceforge.net/Inetc_plug-in). Copy the
+dlls into C:\Program Files (x86)\NSIS\Plugins.
+
+Install and launch the compiler. Open the installer.nsi file in the compiler, and
+compile it. This will create the installer.exe file.

src/installer/Windows/installer.nsi

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+
+; MethodScript Installer
+; Checks for Java, and if not present, downloads and installs AdoptOpenJDK
+; then downloads the latest MethodScript jar, running the install command.
+; Optionally, sample files from the 'examples' command can be installed.
+
+Unicode true
+
+!include "MUI2.nsh"
+!include "LogicLib.nsh"
+!include "nsDialogs.nsh"
+!include "x64.nsh"
+!include "FileFunc.nsh"
+
+Name "MethodScript Cmdline Installer"
+Caption "MethodScript Cmdline"
+OutFile "MethodScriptInstaller.exe"
+ShowInstDetails show
+
+Function .onInit
+	${If} ${RunningX64}
+		SetRegView 64
+	${EndIf}
+	SetOutPath $TEMP
+	File /oname=spltmp.bmp "..\..\main\resources\siteDeploy\resources\images\CommandHelper_IconHighRes_Sprite.bmp"
+	advsplash::show 750 1500 1500 0xFF00FF $TEMP\spltmp
+	Pop $0
+	Delete $TEMP\spltmp.bmp
+FunctionEnd
+
+Function un.onInit
+	${If} ${RunningX64}
+		SetRegView 64
+	${EndIf}
+FunctionEnd
+
+!define MUI_ICON "..\..\main\resources\siteDeploy\resources\images\favicon.ico"
+!define MUI_HEADERIMAGE
+!define MUI_HEADERIMAGE_BITMAP "..\..\main\resources\siteDeploy\resources\images\CommandHelper_Icon.bmp"
+!define MUI_HEADERIMAGE_RIGHT
+
+
+!define MUI_WELCOMEPAGE_TITLE "MethodScript Cmdline Installer"
+!define MUI_WELCOMEPAGE_TEXT "This installer downloads and configures your system with everything you need to \
+run MethodScript from the command line. If Java is already installed, that version will be used, but if you don't \
+have Java installed, AdoptOpenJDK will be installed for you. If you wish to use another version of Java other than \
+those offered, please exit the installer, install Java manually, then restart the installer."
+!insertmacro MUI_PAGE_WELCOME
+!insertmacro MUI_PAGE_LICENSE "..\..\..\LICENSE.txt"
+Page Custom CheckJava LeaveJava
+
+!insertmacro MUI_PAGE_INSTFILES
+
+
+!insertmacro MUI_LANGUAGE "English"
+Var JavaInstallationPath
+Var Dialog
+Var InstallJava
+Var JavaVersion
+Var JDK
+Var JRE
+Var UseJRE
+Var Use64Bit
+
+Function CheckJava
+
+	Call _FindJava
+	${If} $JavaInstallationPath != ""
+		StrCpy $InstallJava "false"
+		Abort
+	${EndIf}
+
+	StrCpy $InstallJava "true"
+	!insertmacro MUI_HEADER_TEXT "Java Installation" "Select the Java version you wish to install. \
+	If you wish to install another version, exit the installer, manually install Java, then run it again. \
+	Only LTS versions are available through this installer."
+	nsDialogs::Create 1018
+	Pop $Dialog
+
+	${If} $Dialog == error
+		Abort
+	${EndIf}
+
+	${NSD_CreateGroupBox} 10% 10u 80% 62u "JDK/JRE"
+	Pop $0
+
+		${NSD_CreateLabel} 20% 25u 50% 10u "If you aren't sure which one to select, use JRE"
+
+		${NSD_CreateRadioButton} 20% 35u 20% 10u "JRE"
+		Pop $JRE
+
+		${NSD_CreateRadioButton} 20% 45u 20% 10u "JDK"
+		Pop $JDK
+
+	${NSD_CreateGroupBox} 5% 75u 90% 34u "Java Version"
+	Pop $0
+
+		${NSD_CreateDropList} 10% 87u 80% 80u "Version"
+		Pop $JavaVersion
+			${NSD_CB_AddString} $JavaVersion "8 (recommended)"
+			${NSD_CB_AddString} $JavaVersion "11"
+
+	nsDialogs::Show
+FunctionEnd
+
+Function LeaveJava
+	${NSD_GetState} $JRE $R0
+	${NSD_GetState} $JDK $R1
+
+	${If} $R0 == 1
+		StrCpy $UseJRE "true"
+	${ElseIf} $R1 == 1
+		StrCpy $UseJRE "false"
+	${Else}
+		MessageBox MB_ICONEXCLAMATION "Please select either the JDK or JRE"
+		Abort
+	${EndIf}
+
+	${NSD_GetText} $JavaVersion $R0
+
+	${If} $R0 == ""
+		MessageBox MB_ICONEXCLAMATION "Please select the Java version you wish to install"
+		Abort
+	${ElseIf} $R0 == "8 (recommended)"
+		StrCpy $JavaVersion "8"
+	${Else}
+		StrCpy $JavaVersion $R0
+	${EndIf}
+
+	${If} ${RunningX64}
+		StrCpy $Use64Bit "true"
+	${Else}
+		StrCpy $Use64Bit "false"
+	${EndIf}
+FunctionEnd
+
+Section DoOverview
+	${If} $InstallJava == "true"
+		DetailPrint "Installing Java"
+		DetailPrint "Using JRE: $UseJRE"
+		DetailPrint "Java Version to install: $JavaVersion"
+		DetailPrint "Install 64 bit Java: $Use64Bit"
+	${Else}
+		DetailPrint "Skipping Java Installation"
+	${EndIf}
+SectionEnd
+
+Var JavaDownload
+Section DoJavaInstall
+	${If} $InstallJava == "false"
+		goto DoJavaInstallEnd
+	${EndIf}
+	${If} $InstallJava == "true"
+		${If} $JavaVersion == "8"
+			${If} $UseJRE == "true"
+				${If} $Use64Bit == "true"
+					StrCpy $JavaDownload "https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u282-b08/OpenJDK8U-jre_x64_windows_hotspot_8u282b08.msi"
+				${Else}
+					StrCpy $JavaDownload "https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u282-b08/OpenJDK8U-jre_x86-32_windows_hotspot_8u282b08.msi"
+				${EndIf}
+			${Else}
+				${If} $Use64Bit == "true"
+					StrCpy $JavaDownload "https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u282-b08/OpenJDK8U-jdk_x64_windows_hotspot_8u282b08.msi"
+				${Else}
+					StrCpy $JavaDownload "https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u282-b08/OpenJDK8U-jdk_x86-32_windows_hotspot_8u282b08.msi"
+				${EndIf}
+			${EndIf}
+		${ElseIf} $JavaVersion == "11"
+			${If} $UseJRE == "true"
+				${If} $Use64Bit == "true"
+					StrCpy $JavaDownload "https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.10%2B9/OpenJDK11U-jre_x64_windows_hotspot_11.0.10_9.msi"
+				${Else}
+					StrCpy $JavaDownload "https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.10%2B9/OpenJDK11U-jre_x86-32_windows_hotspot_11.0.10_9.msi"
+				${EndIf}
+			${Else}
+				${If} $Use64Bit == "true"
+					StrCpy $JavaDownload "https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.10%2B9/OpenJDK11U-jdk_x64_windows_hotspot_11.0.10_9.msi"
+				${Else}
+					StrCpy $JavaDownload "https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.10%2B9/OpenJDK11U-jdk_x86-32_windows_hotspot_11.0.10_9.msi"
+				${EndIf}
+			${EndIf}
+		${Else}
+			;; Forgotten use case!
+			MessageBox MB_ICONSTOP "Error, missing use case!"
+		${EndIf}
+	${EndIf}
+	GetInstaller:
+	DetailPrint "Downloading Java Installer from $JavaDownload to $TEMP\JavaInstaller.msi"
+	inetc::get $JavaDownload $TEMP\JavaInstaller.msi
+	Pop $R0 ;Get the return value
+	${If} $R0 == "success"
+		MessageBox MB_ICONSTOP "Download failed: $R0"
+		Abort
+	${EndIf}
+	DetailPrint "Installing Java"
+	ExecWait "msiexec /i $\"$TEMP\JavaInstaller.msi$\"" $0
+	${If} $0 != 0
+		MessageBox MB_ABORTRETRYIGNORE "Java installation failed or was cancelled" IDABORT AbortInstaller IDRETRY GetInstaller
+	${EndIf}
+
+	Delete $TEMP\JavaInstaller.msi
+	Call _FindJava
+	${If} $JavaInstallationPath == ""
+		MessageBox MB_ABORTRETRYIGNORE "After installation, Java still cannot be found" IDABORT AbortInstaller IDRETRY GetInstaller
+	${EndIf}
+	goto DoJavaInstallEnd
+	AbortInstaller:
+		Abort
+	DoJavaInstallEnd:
+SectionEnd
+
+Section DoDownloadMethodScript
+	; First, create the AppData folder, which is where the jar will go
+	;;;; TODO: Write out the icon in the installer, and update the DoConfigureUninstaller location
+	CreateDirectory $LOCALAPPDATA\MethodScript
+	DetailPrint "Downloading latest MethodScript jar to $LOCALAPPDATA\MethodScript\MethodScript.jar"
+	inetc::get "https://methodscript.com/MethodScript.jar" $LOCALAPPDATA\MethodScript\MethodScript.jar
+	ExecWait "java -jar $LOCALAPPDATA\MethodScript\MethodScript.jar install-cmdline"
+	ExecWait "java -jar $LOCALAPPDATA\MethodScript\MethodScript.jar eval $\"exit()$\""
+	SetOutPath $LOCALAPPDATA\MethodScript
+	File /oname=icon.ico "..\..\main\resources\siteDeploy\resources\images\commandhelper_icon.ico"
+	; This might not be working, but anyways, the icon is used in the uninstaller, so putting the icon in the folder is necessary.
+	WriteINIStr "$LOCALAPPDATA\MethodScript\desktop.ini" ".ShellClassInfo" "IconResource" "$LOCALAPPDATA\MethodScript\icon.ico,0"
+	WriteINIStr "$LOCALAPPDATA\MethodScript\desktop.ini" "ViewState" "FolderType" "Documents"
+	SetFileAttributes "$LOCALAPPDATA\MethodScript\desktop.ini" HIDDEN|SYSTEM
+SectionEnd
+
+Section DoConfigureUninstaller
+	WriteUninstaller "$LOCALAPPDATA\MethodScript\uninstall.exe"
+	WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" "DisplayName" "MethodScript"
+	WriteRegExpandStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" \
+		"UninstallString" "$\"$LOCALAPPDATA\MethodScript\uninstall.exe$\""
+	WriteRegExpandStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" \
+		"InstallLocation" "$\"$LOCALAPPDATA\MethodScript$\""
+	WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" \
+		"DisplayIcon" "$\"$LOCALAPPDATA\MethodScript\icon.ico$\""
+	; TODO Once a silent uninstall is ready
+	;WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" \
+	;	"QuietUninstallString" "$\"$INSTDIR\uninstall.exe$\" /S"
+	WriteRegDWORD HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" \
+		"NoRepair" "1"
+	WriteRegDWORD HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" \
+		"NoModify" "1"
+	WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" "Publisher" "MethodScript Contributors"
+	${GetSize} "$LOCALAPPDATA\MethodScript" "/S=OK" $0 $1 $2
+	IntFmt $0 "0x%08X" $0
+	WriteRegDWORD HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" "EstimatedSize" "$0"
+	nsExec::ExecToStack "java -jar $LOCALAPPDATA\MethodScript\MethodScript.jar eval $\"engine_build_date()$\""
+	Pop $0 ; Return
+	Pop $1 ; Output
+	WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript" "DisplayVersion" "$1"
+
+	DetailPrint "Cmdline MethodScript is now installed! You may need to reboot your computer to use it from the shell."
+	DetailPrint "Try running `mscript` or `mscript -- help`."
+SectionEnd
+
+Section un.DoMethodScriptUninstall
+	ExecWait "java -jar $LOCALAPPDATA\MethodScript\MethodScript.jar uninstall-cmdline"
+SectionEnd
+
+Section un.DoPreferencesUninstall
+	MessageBox MB_YESNO "Would you like to remove your preferences and other files located at $LOCALAPPDATA\MethodScript?" IDNO DoPreferencesUninstallEnd
+	RMDir /R /REBOOTOK "$LOCALAPPDATA\MethodScript"
+	DoPreferencesUninstallEnd:
+SectionEnd
+
+Section un.DoJavaUninstall
+	MessageBox MB_ICONINFORMATION "If you wish to uninstall Java as well, please find the uninstaller in Add/Remove Programs."
+SectionEnd
+
+Section un.DoUninstallerUninstall
+	DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MethodScript"
+SectionEnd
+
+Function _FindJava
+    StrCpy $1 "SOFTWARE\JavaSoft\Java Runtime Environment"
+    StrCpy $2 0
+    ReadRegStr $2 HKLM "$1" "CurrentVersion"  
+    StrCmp $2 "" DetectTry2 JRE
+    JRE:
+    ReadRegStr $5 HKLM "$1\$2" "JavaHome"
+    StrCmp $5 "" DetectTry2 GetValue
+
+    DetectTry2:  
+    ReadRegStr $2 HKLM "SOFTWARE\JavaSoft\Java Development Kit" "CurrentVersion"
+    StrCmp $2 "" NoJava JDK
+    JDK:
+    ReadRegStr $5 HKLM "SOFTWARE\JavaSoft\Java Development Kit\$2" "JavaHome"
+    StrCmp $5 "" NoJava GetValue
+
+    GetValue:
+    StrCpy $JavaInstallationPath $5
+    DetailPrint "Javahome value: $JavaInstallationPath"
+    Goto done
+
+    NoJava:
+    DetailPrint "No Java installation detected."
+    # Install Java
+	StrCpy $JavaInstallationPath ""
+    Goto done
+
+    done:
+    #$JavaInstallationPath should contain the system path to Java
+FunctionEnd