NSIS script enhancements

- Enable Unicode support
- Activate LongPathsEnabled if the user tries to install into a directory 
  with more than 30 characters length
- Change welcome text page. No need to close other programs during our setup
- Warn if the user has less than 8GB of RAM
- Formatting, comments

NSIS/sdui.nsi

@@ -1,5 +1,8 @@
 ; Script generated by the HM NIS Edit Script Wizard.
 
+Target x86-unicode
+Unicode True
+!AddPluginDir /x86-unicode "."
 ; HM NIS Edit Wizard helper defines
 !define PRODUCT_NAME "Stable Diffusion UI"
 !define PRODUCT_VERSION "Installer 2.35"
@@ -18,6 +21,11 @@ Var Text
 Var V14
 Var V15
 
+Var InstDirLen
+Var LongPathsEnabled
+Var AccountType
+
+;---------------------------------------------------------------------------------------------------------
 ; This function returns the number of spaces in a string.
 ; The string is passed on the stack (using Push $STRING)
 ; The result is also returned on the stack and can be consumed with Pop $var
@@ -44,13 +52,32 @@ Function CheckForSpaces
   Exch $R0
 FunctionEnd
 
+;---------------------------------------------------------------------------------------------------------
+; The function DirectoryLeave is called after the user chose the installation directory.
+; If it calls "abort", the user is sent back to choose a different directory.
 Function DirectoryLeave
-   ; check whether the installation directory path is longer than 40 characters.
+   ; check whether the installation directory path is longer than 30 characters.
+   ; If yes, we suggest to the user to enable long filename support
    ;----------------------------------------------------------------------------
-   StrLen $0 "$INSTDIR"
+   StrLen $InstDirLen "$INSTDIR"
-   ${If} $0 > 40
+
-      MessageBox MB_OK|MB_ICONEXCLAMATION "Installation path name too long. The installation path must not have more than 40 characters."
+   ; Check whether the registry key that allows for >260 characters in a path name is set
-      abort
+   ReadRegStr $LongPathsEnabled HKLM "SYSTEM\CurrentControlSet\Control\FileSystem" "LongPathsEnabled"
+
+   ${If} $InstDirLen > 30
+   ${AndIf} $LongPathsEnabled == "0"
+      ; Check whether we're in the Admin group
+      UserInfo::GetAccountType
+      Pop $AccountType
+
+      ${If} $AccountType == "Admin"
+      ${AndIf} ${Cmd} `MessageBox MB_YESNO|MB_ICONQUESTION 'The path name is too long. $\n$\nYou can either enable long file name support in Windows,$\nor you can go back and choose a different path.$\n$\nFor details see: shorturl.at/auBD1$\n$\nEnable long path name support in Windows?' IDYES`
+          ; Enable long path names
+          WriteRegDWORD HKLM "SYSTEM\CurrentControlSet\Control\FileSystem" "LongPathsEnabled" 1
+      ${Else}
+          MessageBox MB_OK|MB_ICONEXCLAMATION "Installation path name too long. The installation path must not have more than 30 characters."
+          abort
+      ${EndIf}
    ${EndIf}
    
    ; Check for spaces in the installation directory path.
@@ -78,8 +105,12 @@ Function DirectoryLeave
 
 FunctionEnd
 
+;---------------------------------------------------------------------------------------------------------
+; This function is currently not being used. To be used in the future for the v1.4 vs v1.5 chooser
 Function nsDialogsPage
     !insertmacro MUI_HEADER_TEXT "Default Stable diffusion model" "Select the default model to be installed"
+
+    
     nsDialogs::Create 1018
     Pop $Dialog
 
@@ -90,23 +121,26 @@ Function nsDialogsPage
     ${NSD_CreateLabel} 0 0 100% 48u "Which Stable Diffusion Modell do you want to use?$\r$\n$\r$\nThere are two models of Stable Diffusion.$\r$\n- Version 1.4 is using less memory.$\r$\n- Version 1.5 is bigger, but has slightly better results."
     Pop $Label
  	
-    ${NSD_CreateFirstRadioButton} 0 49u 100% 12u "Use SD v1.4 as default"
+    ${NSD_CreateFirstRadioButton} 0 49u 100% 12u "Use SD v1.4 as default (3.97 GB)"
     Pop $V14
 
-    ${NSD_CreateAdditionalRadioButton} 0 62u 100% 12u "Use SD v1.5 as default"
+    ${NSD_CreateAdditionalRadioButton} 0 62u 100% 12u "Use SD v1.5 as default (4.7 GB)"
     Pop $V15
 
     nsDialogs::Show
 FunctionEnd
 
-
+;---------------------------------------------------------------------------------------------------------
 ; MUI Settings
+;---------------------------------------------------------------------------------------------------------
 !define MUI_ABORTWARNING
 !define MUI_ICON "sd.ico"
 
 !define MUI_WELCOMEFINISHPAGE_BITMAP "astro.bmp"
 
 ; Welcome page
+!define MUI_WELCOMEPAGE_TEXT "This installer will guide you through the installation of Stable Diffusion UI.$\n$\n\
+Click Next to continue."
 !insertmacro MUI_PAGE_WELCOME
 ; License page
 !insertmacro MUI_PAGE_LICENSE "..\LICENSE"
@@ -118,19 +152,21 @@ FunctionEnd
 ;; TODO: Requires support from "Start Stable Diffusion UI.cmd" and "server.py"
 ;; which needs to be developed first
 ; --------
-; Page custom nsDialogsPage
+;Page custom nsDialogsPage
 ; --------
 
 ; Instfiles page
-!insertmacro MUI_PAGE_INSTFILES
+!insertmacro MUI_PAGE_INSTFILES 
+
 ; Finish page
 !define MUI_FINISHPAGE_RUN "$INSTDIR\Start Stable Diffusion UI.cmd"
 !insertmacro MUI_PAGE_FINISH
 
 ; Language files
 !insertmacro MUI_LANGUAGE "English"
-
+;---------------------------------------------------------------------------------------------------------
-; MUI end ------
+; MUI end
+;---------------------------------------------------------------------------------------------------------
 
 Name "${PRODUCT_NAME} ${PRODUCT_VERSION}"
 OutFile "Install Stable Diffusion UI.exe"
@@ -138,6 +174,8 @@ InstallDir "C:\Stable-Diffusion-UI\"
 InstallDirRegKey HKLM "${PRODUCT_DIR_REGKEY}" ""
 ShowInstDetails show
 
+;---------------------------------------------------------------------------------------------------------
+; List of files to be installed
 Section "MainSection" SEC01
   SetOutPath "$INSTDIR"
   File "..\CreativeML Open RAIL-M License"
@@ -153,17 +191,55 @@ Section "MainSection" SEC01
   CreateShortCut "$SMPROGRAMS\Stable Diffusion UI\Start Stable Diffusion UI.lnk" "$INSTDIR\Start Stable Diffusion UI.cmd"
 SectionEnd
 
+;---------------------------------------------------------------------------------------------------------
 ; Our installer only needs 25 KB, but once it has run, we need 25 GB
 ; So we need to overwrite the automatically detected space requirements.
 ; https://nsis.sourceforge.io/Docs/Chapter4.html#4.9.13.7
 ; The example in section 4.9.13.7 seems to be wrong: the number
 ; needs to be provided in Kilobytes.
 Function .onInit
-  # Set required size of section 'SEC01' to 25 Gigabytes
+   ; Set required size of section 'SEC01' to 25 Gigabytes
-  SectionSetSize ${SEC01} 26214400
+   SectionSetSize ${SEC01} 26214400
+  
+  
+   ; Check system meory size. We need at least 8GB
+   ; ----------------------------------------------------
+
+   ; allocate a few bytes of memory
+   System::Alloc 64
+   Pop $1
+
+   ; Retrieve HW info from the Windows Kernel
+   System::Call "*$1(i64)"
+   System::Call "Kernel32::GlobalMemoryStatusEx(i r1)"
+   ; unpack the data into $R2 - $R10
+   System::Call "*$1(i.r2, i.r3, l.r4, l.r5, l.r6, l.r7, l.r8, l.r9, l.r10)"
+
+   # free up the memory
+   System::Free $1
+
+   ; Result mapping:
+   ; "Structure size: $2 bytes"
+   ; "Memory load: $3%"
+   ; "Total physical memory: $4 bytes"
+   ; "Free physical memory: $5 bytes"
+   ; "Total page file: $6 bytes"
+   ; "Free page file: $7 bytes"
+   ; "Total virtual: $8 bytes"
+   ; "Free virtual: $9 bytes"
+
+   ; Mem size in MB
+   System::Int64Op $4 / 1048576
+   Pop $4
+
+   ${If} $4 < "80000"
+      MessageBox MB_OK|MB_ICONEXCLAMATION "Warning!$\n$\nYour system has less than 8GB of memory (RAM).$\n$\n\
+You can still try to install Stable Diffusion UI,$\nbut it might have problems to start, or run$\nvery slowly."
+   ${EndIf}
+  
 FunctionEnd
 
 
-Section -Post
+;Section -Post
-  WriteRegStr HKLM "${PRODUCT_DIR_REGKEY}" "" "$INSTDIR\installer.exe"
+;  WriteRegStr HKLM "${PRODUCT_DIR_REGKEY}" "" "$INSTDIR\installer.exe"
-SectionEnd
+;SectionEnd