refactor: reduce global varible useage, fixed quote issue, added parameters support

vendor/lib/flag_exists.cmd

@@ -1,59 +1,67 @@
 @echo off
-set "flag_exists=%~dp0flag_exists"
 setlocal
 
 if "%~1" equ "" goto :wrongSyntax
 
 if not defined CMDER_USER_FLAGS (
+  :: in case nothing was passed to %CMDER_USER_FLAGS%
   set "CMDER_USER_FLAGS= "
 )
 
-set "feNOT=false"
+set "feNot=false"
 goto :parseArgument
 
 :doShift
   shift
 
 :parseArgument
-set "currenTarg=%~1"
-if /i "%currenTarg%" == "/?" (
+set "currenArgu=%~1"
+if /i "%currenArgu%" equ "/setPath" (
+  :: set %flag_exists% shortcut
+  endlocal
+  set "flag_exists=%~dp0flag_exists"
+) else if /i "%currenArgu%" == "/?" (
   goto :help
-) else if /i "%currenTarg%" equ "/help" (
+) else if /i "%currenArgu%" equ "/help" (
   goto :help
-) else if /i "%currenTarg%" equ "/h" (
+) else if /i "%currenArgu%" equ "/h" (
   goto :help
-) else if /i "%currenTarg%" equ "NOT" (
-  set "feNOT=true"
+) else if /i "%currenArgu%" equ "NOT" (
+  set "feNot=true"
   goto :doShift
 ) else (
   if "%~1" equ "" goto :wrongSyntax
   if "%~2" equ "" goto :wrongSyntax
-  set "feArgName=%~1"
+  set "feFlagName=%~1"
   set "feCommand=%~2"
+  if not "%~3" equ "" (
+    set "feParam=%~3"
+  )
   goto :detect
 )
 
 :detect
-:: to avoid erroneous deteciton like "/do" "/doNOT", both have a "/do"
-:: but if it works like "/do " "/doNOT ", "/do " won't match "/doN"
-set "CMDER_USER_FLAGS=%CMDER_USER_FLAGS% "
-set "feArgName=%feArgName% "
+:: to avoid erroneous deteciton like "/do" "/doNOT", which both have a "/do"
+:: we added a space after the flag name, like "/do ", which won't match "/doN"
+set "feFlagName=%feFlagName% "
 :: echo.
 :: echo %CMDER_USER_FLAGS%
 :: echo %feNOT%
-:: echo %feArgName%
+:: echo %feFlagName%
 :: echo %feCommand%
+:: echo %feParam%
 :: echo.
-echo %CMDER_USER_FLAGS% | find /i "%feArgName%">nul
+echo %CMDER_USER_FLAGS% | find /i "%feFlagName%">nul
 if "%ERRORLEVEL%" == "0" (
   if "%feNOT%" == "false" (
-    call "%feCommand%"
+    call %feCommand% %feParam%
   )
 ) else (
   if "%feNOT%" == "true" (
-    call "%feCommand%"
+    call %feCommand% %feParam%
   )
 )
+endlocal
 exit /b
 
 :wrongSyntax
@@ -61,6 +69,7 @@ echo The syntax of the command is incorrect.
 echo.
 echo use /? for help
 echo.
+endlocal
 exit /b
 
 :help
@@ -72,17 +81,26 @@ echo   written by xiazeyu, inspired DRSDavidSoft.
 echo.
 echo Usage:
 echo.
-echo %%flag_exists%% [NOT] argName command
+echo %%flag_exists%% [/setPath] [NOT] flagName command/program [parameters]
 echo.
-echo   NOT      Specifies that %%flag_exists%% should carry out
-echo            the command only if the condition is false.
+echo   setPath          Generate a global varible %%flag_exists%% for
+echo                    quicker use. Following arguments will be ignored.
 echo.
-echo   argName  Specifies which argument name is to detect.
+echo   NOT              Specifies that %%flag_exists%% should carry out
+echo                    the command only if the flag is missing.
 echo.
-echo   command  Specifies the command to carry out if the
-echo            argument name is detected. It's recommand to
-echo            use a pair of double quotation marks to
-echo            wrap your command to avoid exceed expectation.
+echo   flagName         Specifies which flag name is to detect. It's recommand
+echo                    to use a pair of double quotation marks to wrap
+echo                    your flag name to avoid exceed expectation.
+echo.
+echo   command/program  Specifies the command to carry out if the
+echo                    argument name is detected. It's recommand to
+echo                    use a pair of double quotation marks to
+echo                    wrap your command to avoid exceed expectation.
+echo.
+echo   parameters       These are the parameters passed to the command/program.
+echo                    It's recommand to use a pair of double quotation marks 
+echo                    to wrap your flag name to avoid exceed expectation.
 echo.
 echo Examples:
 echo.
@@ -93,7 +111,7 @@ echo   Case 1:
 echo.
 echo   The following command in user-profile.cmd would execute "notepad.exe"
 echo.
-echo     call %%flag_exists%% "/startNotepad" "cmd /c start notepad.exe"
+echo     call %%flag_exists%% "/startNotepad" "start" "notepad.exe"
 echo.
 echo   if you pass parameter to init.bat like:
 echo.
@@ -103,10 +121,11 @@ echo   Case 2:
 echo.
 echo   The following command in user-profile.cmd would execute "notepad.exe"
 echo.
-echo     call %%flag_exists%% NOT "/dontStartNotepad" "cmd /c start notepad.exe"
+echo     call %%flag_exists%% NOT "/dontStartNotepad" "start" "notepad.exe"
 echo.
 echo   UNLESS you pass parameter to init.bat like:
 echo.
 echo     init.bat /dontStartNotepad
 echo.
+endlocal
 exit /b