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dnl @synopsis adl_NORMALIZE_PATH(VARNAME, [REFERENCE_STRING])
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dnl Perform some cleanups on the value of $VARNAME (interpreted as a path):
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dnl - empty paths are changed to '.'
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dnl - trailing slashes are removed
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dnl - repeated slashes are squeezed except a leading doubled slash '//'
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dnl (which might indicate a networked disk on some OS).
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dnl REFERENCE_STRING is used to turn '/' into '\' and vice-versa:
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dnl if REFERENCE_STRING contains some backslashes, all slashes and backslashes
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dnl are turned into backslashes, otherwise they are all turned into slashes.
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dnl This makes processing of DOS filenames quite easier, because you
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dnl can turn a filename to the Unix notation, make your processing, and
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dnl turn it back to original notation.
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dnl filename='A:\FOO\\BAR\'
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dnl old_filename="$filename"
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dnl # Switch to the unix notation
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dnl adl_NORMALIZE_PATH([filename], ["/"])
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dnl # now we have $filename = 'A:/FOO/BAR' and we can process it as if
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dnl # it was a Unix path. For instance let's say that you want
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dnl # to append '/subpath':
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dnl filename="$filename/subpath"
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dnl # finally switch back to the original notation
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dnl adl_NORMALIZE_PATH([filename], ["$old_filename"])
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dnl # now $filename equals to 'A:\FOO\BAR\subpath'
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dnl One good reason to make all path processing with the unix convention
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dnl is that backslashes have a special meaning in many cases. For instance
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dnl expr 'A:\FOO' : 'A:\Foo'
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dnl will return 0 because the second argument is a regex in which
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dnl backslashes have to be backslashed. In other words, to have the
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dnl two strings to match you should write this instead:
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dnl expr 'A:\Foo' : 'A:\\Foo'
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dnl Such behavior makes DOS filenames extremely unpleasant to work with.
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dnl So temporary turn your paths to the Unix notation, and revert
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dnl them to the original notation after the processing. See the
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dnl macro adl_COMPUTE_RELATIVE_PATHS for a concrete example of this.
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dnl REFERENCE_STRING defaults to $VARIABLE, this means that slashes
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dnl will be converted to backslashes if $VARIABLE already contains
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dnl some backslashes (see $thirddir below).
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dnl firstdir='/usr/local//share'
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dnl seconddir='C:\Program Files\\'
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dnl thirddir='C:\home/usr/'
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dnl adl_NORMALIZE_PATH([firstdir])
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dnl adl_NORMALIZE_PATH([seconddir])
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dnl adl_NORMALIZE_PATH([thirddir])
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dnl # $firstdir = '/usr/local/share'
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dnl # $seconddir = 'C:\Program Files'
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dnl # $thirddir = 'C:\home\usr'
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dnl @author Alexandre Duret-Lutz <duret_g@epita.fr>
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AC_DEFUN([adl_NORMALIZE_PATH],
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# change empty paths to '.'
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# strip trailing slashes
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:*[[\\/]]:) $1=`echo "[$]$1" | sed 's,[[\\/]]*[$],,'` ;;
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# squeze repeated slashes
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case ifelse($2,,"[$]$1",$2) in
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# if the path contains any backslashes, turn slashes into backslashes
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*\\*) $1=`echo "[$]$1" | sed 's,\(.\)[[\\/]][[\\/]]*,\1\\\\,g'` ;;
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# if the path contains slashes, also turn backslashes into slashes
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*) $1=`echo "[$]$1" | sed 's,\(.\)[[\\/]][[\\/]]*,\1/,g'` ;;
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m4/normpath.m4
