replace_tag: Updates and adds doxygen options in a line string vector
Description
Scans the lines and changes the value for the named tag if one line has
this tag, adds a line at the end if no line has this tag and returns a
warning if several lines match the tag.
Usage
replace_tag(fileStrings, tag, newVal)
Arguments
fileStrings
A vector with each string containing a line of the
file