use "if not defined"

Author: sebthom

modules/files.cmd

@@ -11,7 +11,7 @@ goto :eof
   setlocal
   set abs_path=%~f1
   set result_var=%~2
-  if "%result_var%" == "" (
+  if not defined result_var (
     echo %abs_path%
     exit /B 0
   )
@@ -23,7 +23,7 @@ goto :eof
   setlocal
   set basename=%~nx1
   set result_var=%~2
-  if "%result_var%" == "" (
+  if not defined result_var (
     echo %basename%
     exit /B 0
   )
@@ -34,7 +34,7 @@ goto :eof
   setlocal
   set basename=%~n1
   set result_var=%~2
-  if "%result_var%" == "" (
+  if not defined result_var (
     echo %basename%
     exit /B 0
   )
@@ -46,7 +46,7 @@ goto :eof
   set file_path=%~1
   set result_var=%~2
   set /P content=<"%file_path%"
-  if "%result_var%" == "" (
+  if not defined result_var (
     echo %content%
     exit /B 0
   )

modules/miscs.cmd

@@ -25,7 +25,7 @@ goto :eof
   for /F "tokens=2* skip=2" %%a in ('reg query "%reg_path%" /v Path') do (
     set "value=%%b"
   )
-  if "%result_var%" == "" (
+  if not defined result_var (
     echo %value%
     exit /B 0
   )
@@ -37,7 +37,7 @@ goto :eof
   setlocal
   set result_var=%~1
   for /F "tokens=4-5 delims=. " %%i in ('ver') do set win_major_ver=%%i
-  if "%result_var%" == "" (
+  if not defined result_var (
     echo %win_major_ver%
     exit /B 0
   )

modules/strings.cmd

@@ -34,7 +34,7 @@ goto :eof
 
   call set result=%%search_in:%search_for%=%replace_with%%%
 
-  if "%result_var%" == "" (
+  if not defined result_var (
     echo %result%
     exit /B 0
   )
@@ -48,13 +48,8 @@ goto :eof
   set separator=%~2
   set result_var=%~3
 
-  if "%result_var%" == "" (
-    echo %0 - Argument RESULT_VAR missing!
-    exit /B 1
-  )
-
   for /F "delims=%separator%" %%a in ("%search_in%") do (
-    if "%result_var%" == "" (
+    if not defined result_var (
       echo %result%
     ) else (
       endlocal & set "%result_var%=%%a"