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