; This script contains the following functions:
;
; - LaTeXCheck (check installed LaTeX-system), uses:
;    StrPointer
;    StrPoint
;    RevStrPointer
;    RevStrPoint
;
; - un.DelAppPathSub and UnAppPreSuff, (delete the folder ~\Documents and Settings\username\Application Data\LyX for all users), uses:
;    un.GetParent
;    un.GetUsers
;    un.StrPoint
;    StrPointer
;    StrPoint
;    UnAppPreSuff
;
; - CreateAppPathSub and AppPreSuff, (creates the folder ~\Documents and Settings\username\Application Data\LyX for all users), uses:
;    GetParent
;    GetUsers
;    StrPointer
;    StrPoint
;    UnAppPreSuff
;
; - IsUserAdmin (checks if user is admin)
;
; - FileCheck (checks if a given file exists)
;
; - EditorCheck (check for installed editors)
;
;--------------------------

!macro StrPointer FindStr SearchStr Pointer
 ; searches for a string/character (SearchStr) in another string (FindStr)
 ; and returns the number of the character in the FindStr where the SearchStr was found (Pointer)
 ; if nothing was found or the search is impossible the Pointer is set to -1
 
 StrLen $R2 ${SearchStr}
 StrLen $R4 ${FindStr}
 StrCpy $R5 0
 ${if} $R2 == 0
 ${orif} $R4 == 0
  Goto NotFound
 ${endif}
 IntCmp $R4 $R2 loopA NotFound
 loopA:
  StrCpy $R3 ${FindStr} $R2 $R5
  StrCmp $R3 ${SearchStr} Found
  IntOp $R5 $R5 + 1
  IntCmp $R4 $R5 loopA NotFound
  Goto loopA
 Found:
  StrCpy ${Pointer} $R5
  Goto done
 NotFound:
  StrCpy ${Pointer} "-1"
 done:

!macroend
 
;--------------------------------

Function StrPoint
 !insertmacro StrPointer $String $Search $Pointer
FunctionEnd

;--------------------------------

!macro RevStrPointer FindStr SearchStr Pointer
 ; searches for a string/character (SearchStr) in another string (FindStr) in reverse order
 ; and returns the number of the character in the FindStr where the SearchStr was found (Pointer)
 ; if nothing was found or the search is impossible the Pointer is set to +1
 
 StrLen $R2 ${SearchStr}
 StrLen $R4 ${FindStr}
 ${if} $R2 == 0
 ${orif} $R4 == 0
  Goto NotFound
 ${endif}
 IntCmp $R4 $R2 loopA NotFound
 StrCpy $R5 "-$R2"
 loopA:
  StrCpy $R3 ${FindStr} $R2 $R5
  StrCmp $R3 ${SearchStr} Found
  IntOp $R5 $R5 - 1
  IntCmp "$R5" "-$R4" loopA NotFound
  Goto loopA
 Found:
  StrCpy ${Pointer} $R5
  Goto done
 NotFound:
  StrCpy ${Pointer} "+1"
 done:

!macroend
 
;--------------------------------

Function RevStrPoint
 !insertmacro RevStrPointer $String $Search $Pointer
FunctionEnd

;--------------------------------

!macro AppPreSuff AppPre AppSuff
 ; the APPDATA path has always the following structure:
 ; C:\Documents and Settings\username\Application Data
 ; this macro saves the "C:\Documents and Settings\" substring into the variable "AppPre"
 ; and the "Application Data" substring into the variable "AppSuff"
  
  StrCpy $String "$APPDATA"
  StrCpy $Search "\"
  Call StrPoint ; search for the first "\"
  IntOp $Pointer $Pointer + 1 ; jump after the "\"
  StrCpy $String $String "" $Pointer ; cut off the part before the first "\"
  StrCpy $0 $Pointer
  Call StrPoint ; search for the second "\"
  IntOp $0 $0 + $Pointer ; $0 is now the pointer to the second "\" in the APPDATA string
  StrCpy ${AppPre} $APPDATA $0 ; save the part before the second "\"
  IntOp $Pointer $Pointer + 1 ; jump after the "\"
  StrCpy $String $String "" $Pointer ; cut off the part before the second "\"
  Call StrPoint ; search for the third "\"
  IntOp $Pointer $Pointer + 1 ; jump after the "\"
  StrCpy ${AppSuff} $String "" $Pointer ; save the part after the third "\"

!macroend

;--------------------------------

Function GetParent
 ; deletes a subfolder of the APPDATA path for all users
 ; used by the function "un.getUsers"

  Exch $R0
  Push $R1
  Push $R2
  Push $R3
  StrCpy $R1 0
  StrLen $R2 $R0
  loop:
   IntOp $R1 $R1 + 1
   IntCmp $R1 $R2 get 0 get
   StrCpy $R3 $R0 1 -$R1
   StrCmp $R3 "\" get
  Goto loop
  get:
   StrCpy $R0 $R0 -$R1
   Pop $R3
   Pop $R2
   Pop $R1
   Exch $R0
   
FunctionEnd

;--------------------------------

Function GetUsers
 ; reads the subfolders of the "Documents and Settings" folder to get a list of the users

  StrCpy $R3 ""
  Push "$PROFILE"
  Call GetParent  
  Pop $R2
  StrCpy $R2 "$R2"
  FindFirst $R0 $R1 "$R2\*"
  StrCmp $R1 "" findend 0
  findloop:
   IfFileExists "$R2\$R1\*.*" 0 notDir
   StrCmp $R1 "." notDir
   StrCmp $R1 ".." notDir
   StrCmp $R1 "All Users" notDir
   StrCmp $R1 "Default User" notDir
   StrCmp $R1 "All Users.WINNT" notDir
   StrCmp $R1 "Default User.WINNT" notDir  
  StrCpy $R3 "$R3|$R1"
  notDir:
   FindNext $R0 $R1
   StrCmp $R1 "" findend 0
  Goto findloop
  findend:
   FindClose $R0
  
FunctionEnd

;--------------------------------

Function un.GetParent
 ; deletes a subfolder of the APPDATA path for all users
 ; used by the function "un.getUsers"

  Exch $R0
  Push $R1
  Push $R2
  Push $R3
  StrCpy $R1 0
  StrLen $R2 $R0
  loop:
   IntOp $R1 $R1 + 1
   IntCmp $R1 $R2 get 0 get
   StrCpy $R3 $R0 1 -$R1
   StrCmp $R3 "\" get
  Goto loop
  get:
   StrCpy $R0 $R0 -$R1
   Pop $R3
   Pop $R2
   Pop $R1
   Exch $R0
   
FunctionEnd

;--------------------------------

Function un.GetUsers
 ; reads the subfolders of the "Documents and Settings" folder to get a list of the users

  StrCpy $R3 ""
  Push "$PROFILE"
  Call un.GetParent  
  Pop $R2
  StrCpy $R2 "$R2"
  FindFirst $R0 $R1 "$R2\*"
  StrCmp $R1 "" findend 0
  findloop:
   IfFileExists "$R2\$R1\*.*" 0 notDir
   StrCmp $R1 "." notDir
   StrCmp $R1 ".." notDir
   StrCmp $R1 "All Users" notDir
   StrCmp $R1 "Default User" notDir
   StrCmp $R1 "All Users.WINNT" notDir
   StrCmp $R1 "Default User.WINNT" notDir  
  StrCpy $R3 "$R3|$R1"
  notDir:
   FindNext $R0 $R1
   StrCmp $R1 "" findend 0
  Goto findloop
  findend:
   FindClose $R0
  
FunctionEnd

;--------------------------------

Function un.StrPoint
 !insertmacro StrPointer $String $Search $Pointer
FunctionEnd

;--------------------------------

!macro UnAppPreSuff AppPre AppSuff
 ; the APPDATA path has always the following structure:
 ; C:\Documents and Settings\username\Application Data
 ; this macro saves the "C:\Documents and Settings\" substring into the variable "AppPre"
 ; and the "Application Data" substring into the variable "AppSuff"
  
  StrCpy $String "$APPDATA"
  StrCpy $Search "\"
  Call un.StrPoint ; search for the first "\"
  IntOp $Pointer $Pointer + 1 ; jump after the "\"
  StrCpy $String $String "" $Pointer ; cut off the part before the first "\"
  StrCpy $0 $Pointer
  Call un.StrPoint ; search for the second "\"
  IntOp $0 $0 + $Pointer ; $0 is now the pointer to the second "\" in the APPDATA string
  StrCpy ${AppPre} $APPDATA $0 ; save the part before the second "\"
  IntOp $Pointer $Pointer + 1 ; jump after the "\"
  StrCpy $String $String "" $Pointer ; cut off the part before the second "\"
  Call un.StrPoint ; search for the third "\"
  IntOp $Pointer $Pointer + 1 ; jump after the "\"
  StrCpy ${AppSuff} $String "" $Pointer ; save the part after the third "\"

!macroend

;--------------------------------

Function un.DelAppPathSub
 ; deletes a subfolder of the APPDATA path for all users

  ; get list of all users
  Push $R0
  Push $R1
  Push $R2
  Push $R3
  Call un.GetUsers
  StrCpy $UserList $R3 "" 1 ; cut off the "|" at the end of the list
  Pop $R3
  Pop $R2
  Pop $R1
  Pop $R0
  
  ; the usernames in the list of all users is separated by "|"
  loop:
   StrCpy $String "$UserList"
   StrCpy $Search "|"
   Call un.StrPoint ; search for the "|"
   StrCmp $Pointer "-1" ready
   StrCpy $0 $UserList $Pointer ; $0 contains now the username
   IntOp $Pointer $Pointer + 1 ; jump after the "|"
   StrCpy $UserList $UserList "" $Pointer ; cut off the first username in the list
   ; generate the string for the current user
   ; AppPre and AppSuff are generated in the macro "AppPreSuff"
   StrCpy $AppPath "$AppPre\$0\$AppSuff\${PRODUCT_SUBFOLDER}"
   RMDir /r $AppPath ; delete the folder
  Goto loop
  ready:
  StrCpy $0 $UserList
  StrCpy $AppPath "$AppPre\$0\$AppSuff\${PRODUCT_SUBFOLDER}"
  RMDir /r $AppPath ; delete the folder
  
FunctionEnd

;--------------------------------

Function CreateAppPathSub
 ; creates a subfolder of the APPDATA path for all users

  ; get folder names
  !insertmacro AppPreSuff $AppPre $AppSuff

  ; get list of all users
  Push $R0
  Push $R1
  Push $R2
  Push $R3
  Call GetUsers
  StrCpy $UserList $R3 "" 1 ; cut off the "|" at the end of the list
  Pop $R3
  Pop $R2
  Pop $R1
  Pop $R0
  
  ; the usernames in the list of all users is separated by "|"
  loop:
   StrCpy $String "$UserList"
   StrCpy $Search "|"
   Call StrPoint ; search for the "|"
   StrCmp $Pointer "-1" ready
   StrCpy $0 $UserList $Pointer ; $0 contains now the username
   IntOp $Pointer $Pointer + 1 ; jump after the "|"
   StrCpy $UserList $UserList "" $Pointer ; cut off the first username in the list
   ; generate the string for the current user
   ; AppPre and AppSuff are generated in the macro "AppPreSuff"
   StrCpy $AppPath "$AppPre\$0\$AppSuff\${PRODUCT_SUBFOLDER}"
   CreateDirectory $AppPath ; create the folder
   CopyFiles "$INSTDIR\Resources\session" "$AppPath"
  Goto loop
  ready:
  StrCpy $0 $UserList
  StrCpy $AppPath "$AppPre\$0\$AppSuff\${PRODUCT_SUBFOLDER}"
  CreateDirectory $AppPath ; create the folder
  CopyFiles "$INSTDIR\Resources\session" "$AppPath"
  Delete "$INSTDIR\Resources\session" ; delete the session file in the INSTDIR because it is unneeded there
  
FunctionEnd

;--------------------------------

!macro IsUserAdmin Result Name

 ClearErrors
 UserInfo::GetName
 IfErrors Win9x
 Pop $0
 StrCpy ${Name} $0
 UserInfo::GetAccountType
 Pop $1
 ${if} $1 == "Admin"
  StrCpy ${Result} "yes"
 ${else}
  StrCpy ${Result} "no"
 ${endif}
 Goto done

 Win9x:
  StrCpy ${Result} "yes"
 done:

!macroend

;--------------------------------

!macro FileCheck Result FileName FilePath
 ; checks if a file exists, returns "True" or "False"

 Push $0
 Push $1
 StrCpy $0 ""
 StrCpy $1 ""
 FileOpen $0 "${Filepath}\${FileName}" r
 ${if} $0 = ""
  StrCpy $1 "False"
 ${Else}
  StrCpy $1 "True"
 ${endif}
 FileClose $0
 StrCpy ${Result} $1
 Pop $1
 Pop $0

!macroend

;------------------------------------------

Function LaTeXCheck
 ; searches the string "$Search" in the string "$String" and extracts the path around it
 ; the extracted path is checked if the file "latex.exe" is in it

   StartCheck:
   StrLen $3 $String
   Call StrPoint
   ${if} $Pointer == "-1" ; if nothing was found
    StrCpy $LatexPath ""
    Return
   ${endif}
   IntOp $3 $3 - $Pointer
   StrCpy $4 $String $3 "-$3" ; $4 is now the part behind the $Search string
   StrCpy $String $String $Pointer ; $String is now the part before the $Search string
   StrCpy $Search ":" ; search for the ":" after the first previous drive letter
   Call RevStrPoint
   IntOp $Pointer $Pointer - 1 ; jump before the ":" to the drive letter
   StrCpy $Pointer $Pointer "" 1 ; cut of the "-" sign
   StrCpy $LatexPath $String $Pointer "-$Pointer"
   StrCpy $String $4
   StrCpy $Search ";" ; search for the following ";" that separates the different paths
   Call StrPoint
   ${if} $Pointer != "-1" ; if something was found
    StrCpy $String $String $Pointer
   ${endif}
   StrCpy $LatexPath "$LatexPath$String"
   ; check if the latex.exe exists in the $LatexPath folder
   !insertmacro FileCheck $5 "latex.exe" "$LatexPath"
   ${if} $5 == "False" ; delete the entry with the wrong path to the latex.exe and try again
    StrCpy $LatexPath ""
    StrLen $3 $String
    StrCpy $String $4 "" $3
    ${if} $2 == "TeXLive"
     StrCpy $Search "TeXLive"
    ${else}
     StrCpy $Search "miktex"
    ${endif}
    Goto StartCheck
   ${endif}

FunctionEnd

;------------------------------------------

Function EditorCheck

  ; test if an editor with syntax-highlighting for LaTeX-files is installed
  ; (check for jEdit, PSPad, WinShell, ConTEXT, Crimson Editor, Vim, TeXnicCenter, LaTeXEditor, WinEdt, LEd, WinTeX)
  StrCpy $EditorPath ""
  StrCpy $0 ""
  ; check for jEdit
  ReadRegStr $EditorPath HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\jEdit_is1" "InstallLocation"
  ${if} $EditorPath != ""
   StrCpy $EditorPath $EditorPath -1 ; remove "\" from the end of the string
  ${endif}
  ; check for PSPad
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\PSPad editor_is1" "InstallLocation"
  ${if} $0 != ""
   StrCpy $0 $0 -1
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for WinShell
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\WinShell_is1" "InstallLocation"
  ${if} $0 != ""
   StrCpy $0 $0 -1
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for ConTEXT
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\ConTEXTEditor_is1" "InstallLocation"
  ${if} $0 != ""
   StrCpy $0 $0 -1
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for Crimson Editor
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Crimson Editor" "UninstallString"
  ${if} $0 != ""
   StrCpy $0 $0 -14 ; remove "\uninstall.exe"
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for Vim 6.x
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Classes\Applications\gvim.exe\shell\edit\command" ""
  ${if} $0 != ""
   StrCpy $0 $0 -13 ; remove "gvim.exe "%1""
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for Vim 7.0
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Vim 7.0" "UninstallString"
  ${if} $0 != ""
   StrCpy $0 $0 -18 ; remove "\uninstall-gui.exe"
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for TeXnicCenter
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\TeXnicCenter_is1" "Inno Setup: App Path"
  ${if} $0 != ""
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for LaTeXEditor
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\LaTeX Editor" "InstallLocation"
  ${if} $0 != ""
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for WinEdt
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\WinEdt_is1" "InstallLocation"
  ${if} $0 != ""
   StrCpy $0 $0 -1
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for LEd
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\LEd_is1" "InstallLocation"
  ${if} $0 != ""
   StrCpy $0 $0 -1
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}
  ; check for WinTeX
  StrCpy $0 ""
  ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\WinTeX XP" "DisplayIcon"
  ${if} $0 != ""
   StrCpy $0 $0 -11 ; remove "\wintex.exe"
   StrCpy $EditorPath "$EditorPath;$0"
  ${endif}

FunctionEnd