setlocal
set "TWEET=%TEMP%\tweet.txt"
type nul > "%TWEET%"
gvim "%TWEET%"
if errorlevel 1 exit /b
set "CONTENT="
for /F "tokens=*" %%I in ('type "%TWEET%"') do call :set "%%~I"
if "%CONTENT%" == "" exit /b
echo "%CONTENT%"
endlocal
exit /b

:set
    set "CONTENT=%CONTENT%%~1 "
    exit /b