On 8. Jul, 2010, at 10:35 , Johny wrote:
> I am trying to write a cmake function which imitates the functionality of wc
> -l for unix. However i can't seem to be able to figure out how to store the
> result into the variable which is passed to the function.
>
> function (wcl fileName lines)
> file(READ ${fileName} fileData)
> if(fileData)
> string(REGEX MATCHALL "\n" lines ${fileData})
> list(LENGTH lines lines)
> endif(fileData)
> endfunction()
>
> i call the function as
>
> wcl (${fileName} fileLen)
>
> and printing it gives no output
>
> message("${fileLen}")
>
> What am i doing wrong ?
>
> Regards
> Johny
A function creates a new scope, so you need to explicitly set the variable in
the callers scope. Do something like this (it is usual for the output variable
name to be the first argument:
function (wcl nLinesVar fileName)
file(READ ${fileName} fileData)
if(fileData)
string(REGEX MATCHALL "\n" nLines ${fileData})
list(LENGTH nLines nLines)
set(${nLinesVar} ${nLines} PARENT_SCOPE)
else()
set(${nLinesVar} -1 PARENT_SCOPE)
endif()
endfunction()
wcl (fileLen ${fileName})
However, I'm not sure whether counting \n is a good idea (after all, at some
point you might encounter a file with Windows or Mac line endings, or a file
with a missing terminating \n.
Michael
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