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|
@echo off
:: usage: ifchange target temporary
for %%I in (%0) do set progname=%%~nI
set timestamp=
set keepsuffix=
set empty=
set color=auto
:optloop
for %%I in (%1) do set opt=%%~I
if "%opt%" == "--" (
shift
) else if "%opt%" == "--timestamp" (
set timestamp=.
shift
goto :optloop
) else if "%opt:~0,12%" == "--timestamp=" (
set timestamp=%opt:~12%
shift
goto :optloop
) else if "%opt%" == "--keep" (
set keepsuffix=.old
shift
goto :optloop
) else if "%opt:~0,7%" == "--keep=" (
set keepsuffix=%opt:~7%
shift
goto :optloop
) else if "%opt%" == "--empty" (
set empty=yes
shift
goto :optloop
) else if "%opt%" == "--color" (
set color=always
shift
goto :optloop
) else if "%opt:~0,8%" == "--color=" (
set color=%opt:~8%
shift
goto :optloop
) else if "%opt%" == "--debug" (
shift
echo on
goto :optloop
) else if "%opt%" == "--help" (
call :help
exit /b
) else if "%opt:~0,2%" == "--" (
echo %progname%: unknown option: %1 1>&2
exit /b 1
)
if "%2" == "" (
call :help 1>&2
exit /b 1
)
set dest=%1
set src=%2
set dest=%dest:/=\%
set src=%src:/=\%
goto :nt
:unchange
echo %1 unchanged.
del %2
goto :end
:update
echo %1 updated.
:: if exist %1 del %1
dir /b %2
if "%keepsuffix%" != "" %1 %1%keepsuffix%
copy %2 %1
del %2
goto :end
:nt
if exist %dest% (
if not exist %src% goto :nt_unchanged1
if "%empty%" == "" for %%I in (%src%) do if %%~zI == 0 goto :nt_unchanged
fc.exe %dest% %src% > nul && (
:nt_unchanged
del %src%
:nt_unchanged1
for %%I in (%1) do echo %%~I unchanged
goto :nt_end
)
)
for %%I in (%1) do echo %%~I updated
copy %src% %dest% > nul
del %src%
:nt_end
if "%timestamp%" == "" goto :end
if "%timestamp%" == "." (
for %%I in ("%dest%") do set timestamp=%%~dpI.time.%%~nxI
)
goto :end > "%timestamp%"
:help
for %%I in (
"usage: %progname% [options] target new-file"
"options:"
" --timestamp[=file] touch timestamp file. (default: prefixed with '.time')"
" under the directory of the target)"
" --keep[=suffix] keep old file with suffix. (default: '.old')"
" --empty assume unchanged if the new file is empty."
" --color[=always|auto|never] colorize output."
) do echo.%%~I
goto :eof
:end
|
