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+/**
+ * EnvVarUpdate.nsh
+ * : Environmental Variables: append, prepend, and remove entries
+ *
+ * WARNING: If you use StrFunc.nsh header then include it before this file
+ * with all required definitions. This is to avoid conflicts
+ *
+ * Usage:
+ * ${EnvVarUpdate} "ResultVar" "EnvVarName" "Action" "RegLoc" "PathString"
+ *
+ * Credits:
+ * Version 1.0
+ * * Cal Turney (turnec2)
+ * * Amir Szekely (KiCHiK) and e-circ for developing the forerunners of this
+ * function: AddToPath, un.RemoveFromPath, AddToEnvVar, un.RemoveFromEnvVar,
+ * WriteEnvStr, and un.DeleteEnvStr
+ * * Diego Pedroso (deguix) for StrTok
+ * * Kevin English (kenglish_hi) for StrContains
+ * * Hendri Adriaens (Smile2Me), Diego Pedroso (deguix), and Dan Fuhry
+ * (dandaman32) for StrReplace
+ *
+ * Version 1.1 (compatibility with StrFunc.nsh)
+ * * techtonik
+ *
+ * http://nsis.sourceforge.net/Environmental_Variables:_append%2C_prepend%2C_and_remove_entries
+ *
+ */
+
+
+!ifndef ENVVARUPDATE_FUNCTION
+!define ENVVARUPDATE_FUNCTION
+!verbose push
+!verbose 3
+!include "LogicLib.nsh"
+!include "WinMessages.NSH"
+!include "StrFunc.nsh"
+
+; ---- Fix for conflict if StrFunc.nsh is already includes in main file -----------------------
+!macro _IncludeStrFunction StrFuncName
+ !ifndef ${StrFuncName}_INCLUDED
+ ${${StrFuncName}}
+ !endif
+ !ifndef Un${StrFuncName}_INCLUDED
+ ${Un${StrFuncName}}
+ !endif
+ !define un.${StrFuncName} "${Un${StrFuncName}}"
+!macroend
+
+!insertmacro _IncludeStrFunction StrTok
+!insertmacro _IncludeStrFunction StrStr
+!insertmacro _IncludeStrFunction StrRep
+
+; ---------------------------------- Macro Definitions ----------------------------------------
+!macro _EnvVarUpdateConstructor ResultVar EnvVarName Action Regloc PathString
+ Push "${EnvVarName}"
+ Push "${Action}"
+ Push "${RegLoc}"
+ Push "${PathString}"
+ Call EnvVarUpdate
+ Pop "${ResultVar}"
+!macroend
+!define EnvVarUpdate '!insertmacro "_EnvVarUpdateConstructor"'
+
+!macro _unEnvVarUpdateConstructor ResultVar EnvVarName Action Regloc PathString
+ Push "${EnvVarName}"
+ Push "${Action}"
+ Push "${RegLoc}"
+ Push "${PathString}"
+ Call un.EnvVarUpdate
+ Pop "${ResultVar}"
+!macroend
+!define un.EnvVarUpdate '!insertmacro "_unEnvVarUpdateConstructor"'
+; ---------------------------------- Macro Definitions end-------------------------------------
+
+;----------------------------------- EnvVarUpdate start----------------------------------------
+!define hklm_all_users 'HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"'
+!define hkcu_current_user 'HKCU "Environment"'
+
+!macro EnvVarUpdate UN
+
+Function ${UN}EnvVarUpdate
+
+ Push $0
+ Exch 4
+ Exch $1
+ Exch 3
+ Exch $2
+ Exch 2
+ Exch $3
+ Exch
+ Exch $4
+ Push $5
+ Push $6
+ Push $7
+ Push $8
+ Push $9
+ Push $R0
+
+ /* After this point:
+ -------------------------
+ $0 = ResultVar (returned)
+ $1 = EnvVarName (input)
+ $2 = Action (input)
+ $3 = RegLoc (input)
+ $4 = PathString (input)
+ $5 = Orig EnvVar (read from registry)
+ $6 = Len of $0 (temp)
+ $7 = tempstr1 (temp)
+ $8 = Entry counter (temp)
+ $9 = tempstr2 (temp)
+ $R0 = tempChar (temp) */
+
+ ; Step 1: Read contents of EnvVarName from RegLoc
+ ;
+ ; Check for empty EnvVarName
+ ${If} $1 == ""
+ SetErrors
+ DetailPrint "ERROR: EnvVarName is blank"
+ Goto EnvVarUpdate_Restore_Vars
+ ${EndIf}
+
+ ; Check for valid Action
+ ${If} $2 != "A"
+ ${AndIf} $2 != "P"
+ ${AndIf} $2 != "R"
+ SetErrors
+ DetailPrint "ERROR: Invalid Action - must be A, P, or R"
+ Goto EnvVarUpdate_Restore_Vars
+ ${EndIf}
+
+ ${If} $3 == HKLM
+ ReadRegStr $5 ${hklm_all_users} $1 ; Get EnvVarName from all users into $5
+ ${ElseIf} $3 == HKCU
+ ReadRegStr $5 ${hkcu_current_user} $1 ; Read EnvVarName from current user into $5
+ ${Else}
+ SetErrors
+ DetailPrint 'ERROR: Action is [$3] but must be "HKLM" or HKCU"'
+ Goto EnvVarUpdate_Restore_Vars
+ ${EndIf}
+
+ ; Check for empty PathString
+ ${If} $4 == ""
+ SetErrors
+ DetailPrint "ERROR: PathString is blank"
+ Goto EnvVarUpdate_Restore_Vars
+ ${EndIf}
+
+ ; Make sure we've got some work to do
+ ${If} $5 == ""
+ ${AndIf} $2 == "R"
+ SetErrors
+ DetailPrint "$1 is empty - Nothing to remove"
+ Goto EnvVarUpdate_Restore_Vars
+ ${EndIf}
+
+ ; Step 2: Scrub EnvVar
+ ;
+ StrCpy $0 $5 ; Copy the contents to $0
+ ; Remove spaces around semicolons (NOTE: spaces before the 1st entry or
+ ; after the last one are not removed here but instead in Step 3)
+ ${If} $0 != "" ; If EnvVar is not empty ...
+ ${Do}
+ ${${UN}StrStr} $7 $0 " ;"
+ ${If} $7 == ""
+ ${ExitDo}
+ ${EndIf}
+ ${${UN}StrRep} $0 $0 " ;" ";" ; Remove '<space>;'
+ ${Loop}
+ ${Do}
+ ${${UN}StrStr} $7 $0 "; "
+ ${If} $7 == ""
+ ${ExitDo}
+ ${EndIf}
+ ${${UN}StrRep} $0 $0 "; " ";" ; Remove ';<space>'
+ ${Loop}
+ ${Do}
+ ${${UN}StrStr} $7 $0 ";;"
+ ${If} $7 == ""
+ ${ExitDo}
+ ${EndIf}
+ ${${UN}StrRep} $0 $0 ";;" ";"
+ ${Loop}
+
+ ; Remove a leading or trailing semicolon from EnvVar
+ StrCpy $7 $0 1 0
+ ${If} $7 == ";"
+ StrCpy $0 $0 "" 1 ; Change ';<EnvVar>' to '<EnvVar>'
+ ${EndIf}
+ StrLen $6 $0
+ IntOp $6 $6 - 1
+ StrCpy $7 $0 1 $6
+ ${If} $7 == ";"
+ StrCpy $0 $0 $6 ; Change ';<EnvVar>' to '<EnvVar>'
+ ${EndIf}
+ ; DetailPrint "Scrubbed $1: [$0]" ; Uncomment to debug
+ ${EndIf}
+
+ /* Step 3. Remove all instances of the target path/string (even if "A" or "P")
+ $6 = bool flag (1 = found and removed PathString)
+ $7 = a string (e.g. path) delimited by semicolon(s)
+ $8 = entry counter starting at 0
+ $9 = copy of $0
+ $R0 = tempChar */
+
+ ${If} $5 != "" ; If EnvVar is not empty ...
+ StrCpy $9 $0
+ StrCpy $0 ""
+ StrCpy $8 0
+ StrCpy $6 0
+
+ ${Do}
+ ${${UN}StrTok} $7 $9 ";" $8 "0" ; $7 = next entry, $8 = entry counter
+
+ ${If} $7 == "" ; If we've run out of entries,
+ ${ExitDo} ; were done
+ ${EndIf} ;
+
+ ; Remove leading and trailing spaces from this entry (critical step for Action=Remove)
+ ${Do}
+ StrCpy $R0 $7 1
+ ${If} $R0 != " "
+ ${ExitDo}
+ ${EndIf}
+ StrCpy $7 $7 "" 1 ; Remove leading space
+ ${Loop}
+ ${Do}
+ StrCpy $R0 $7 1 -1
+ ${If} $R0 != " "
+ ${ExitDo}
+ ${EndIf}
+ StrCpy $7 $7 -1 ; Remove trailing space
+ ${Loop}
+ ${If} $7 == $4 ; If string matches, remove it by not appending it
+ StrCpy $6 1 ; Set 'found' flag
+ ${ElseIf} $7 != $4 ; If string does NOT match
+ ${AndIf} $0 == "" ; and the 1st string being added to $0,
+ StrCpy $0 $7 ; copy it to $0 without a prepended semicolon
+ ${ElseIf} $7 != $4 ; If string does NOT match
+ ${AndIf} $0 != "" ; and this is NOT the 1st string to be added to $0,
+ StrCpy $0 $0;$7 ; append path to $0 with a prepended semicolon
+ ${EndIf} ;
+
+ IntOp $8 $8 + 1 ; Bump counter
+ ${Loop} ; Check for duplicates until we run out of paths
+ ${EndIf}
+
+ ; Step 4: Perform the requested Action
+ ;
+ ${If} $2 != "R" ; If Append or Prepend
+ ${If} $6 == 1 ; And if we found the target
+ DetailPrint "Target is already present in $1. It will be removed and"
+ ${EndIf}
+ ${If} $0 == "" ; If EnvVar is (now) empty
+ StrCpy $0 $4 ; just copy PathString to EnvVar
+ ${If} $6 == 0 ; If found flag is either 0
+ ${OrIf} $6 == "" ; or blank (if EnvVarName is empty)
+ DetailPrint "$1 was empty and has been updated with the target"
+ ${EndIf}
+ ${ElseIf} $2 == "A" ; If Append (and EnvVar is not empty),
+ StrCpy $0 $0;$4 ; append PathString
+ ${If} $6 == 1
+ DetailPrint "appended to $1"
+ ${Else}
+ DetailPrint "Target was appended to $1"
+ ${EndIf}
+ ${Else} ; If Prepend (and EnvVar is not empty),
+ StrCpy $0 $4;$0 ; prepend PathString
+ ${If} $6 == 1
+ DetailPrint "prepended to $1"
+ ${Else}
+ DetailPrint "Target was prepended to $1"
+ ${EndIf}
+ ${EndIf}
+ ${Else} ; If Action = Remove
+ ${If} $6 == 1 ; and we found the target
+ DetailPrint "Target was found and removed from $1"
+ ${Else}
+ DetailPrint "Target was NOT found in $1 (nothing to remove)"
+ ${EndIf}
+ ${If} $0 == ""
+ DetailPrint "$1 is now empty"
+ ${EndIf}
+ ${EndIf}
+
+ ; Step 5: Update the registry at RegLoc with the updated EnvVar and announce the change
+ ;
+ ClearErrors
+ ${If} $3 == HKLM
+ WriteRegExpandStr ${hklm_all_users} $1 $0 ; Write it in all users section
+ ${ElseIf} $3 == HKCU
+ WriteRegExpandStr ${hkcu_current_user} $1 $0 ; Write it to current user section
+ ${EndIf}
+
+ IfErrors 0 +4
+ MessageBox MB_OK|MB_ICONEXCLAMATION "Could not write updated $1 to $3"
+ DetailPrint "Could not write updated $1 to $3"
+ Goto EnvVarUpdate_Restore_Vars
+
+ ; "Export" our change
+ SendMessage ${HWND_BROADCAST} ${WM_WININICHANGE} 0 "STR:Environment" /TIMEOUT=5000
+
+ EnvVarUpdate_Restore_Vars:
+ ;
+ ; Restore the user's variables and return ResultVar
+ Pop $R0
+ Pop $9
+ Pop $8
+ Pop $7
+ Pop $6
+ Pop $5
+ Pop $4
+ Pop $3
+ Pop $2
+ Pop $1
+ Push $0 ; Push my $0 (ResultVar)
+ Exch
+ Pop $0 ; Restore his $0
+
+FunctionEnd
+
+!macroend ; EnvVarUpdate UN
+!insertmacro EnvVarUpdate ""
+!insertmacro EnvVarUpdate "un."
+;----------------------------------- EnvVarUpdate end----------------------------------------
+
+!verbose pop
+!endif \ No newline at end of file
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