UserDocs/GdalMerge: gdal_wildmerge.bat

@echo off
:: initial version, 2005-Nov-17, matt wilkie
:: this script is public domain
if [%1]==[] (
        echo.
        echo -={ gdal_wildmerge }=- Allow gdal_merge to accept wildcards for input files
        echo .
        echo .  gdal_wildmerge.bat [input-file-wildcard] [output-file] {options}
        echo . 
        echo .  gdal_wildmerge d:\src\*.tif mosaick.tif -init -9999
        echo.
        goto :EOF
        )
        :: %1 is the input wildcard mask
        :: This is inverted from normal gdal_merge usage in order to allow other
        :: options be passed to gdal_merge


:: delayed expansion requires windows NT or later command shell 
:: (it won't work on windows 9x)
        verify other 2>nul 
        setlocal ENABLEDELAYEDEXPANSION 
        if errorlevel 1 goto :wrong_version

:: gdal_merge won't overwrite an existing file  
        if exist %2 goto :file_exists

:: Build the input file list
        set infiles=
        for %%a in (%1) do set infiles=!infiles! "%%a"

:: Here is were the actual work happens
        set gdalcmd=gdal_merge %infiles% -o "%2"
   echo %gdalcmd%
   :: IMPORTANT, if gdal_merge is not call'ed control doesn't return 
        :: to the batch file
        call %gdalcmd%
        goto :EOF

:file_exists
        echo *** the output file "%2" already exists.
        goto :EOF

:wrong_version
        echo.
        echo    Sorry, this batchfile requires DELAYED EXPANSION which is 
        echo    not available in this shell. See 
        echo  http://www.google.com/search?q=enabledelayedexpansion
        goto :EOF