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libnova-0.15.0/ltmain.sh  view on Meta::CPAN

# characters, hashes, percent signs, but SUFFIX may contain a leading
# dot (in which case that matches only a dot).
# func_strip_suffix prefix name
func_stripname ()
{
    case ${2} in
      .*) func_stripname_result=`$ECHO "${3}" | $SED "s%^${1}%%; s%\\\\${2}\$%%"`;;
      *)  func_stripname_result=`$ECHO "${3}" | $SED "s%^${1}%%; s%${2}\$%%"`;;
    esac
} # func_stripname may be replaced by extended shell implementation


# These SED scripts presuppose an absolute path with a trailing slash.
pathcar='s,^/\([^/]*\).*$,\1,'
pathcdr='s,^/[^/]*,,'
removedotparts=':dotsl
		s@/\./@/@g
		t dotsl
		s,/\.$,/,'
collapseslashes='s@/\{1,\}@/@g'
finalslash='s,/*$,/,'

# func_normal_abspath PATH
# Remove doubled-up and trailing slashes, "." path components,
# and cancel out any ".." path components in PATH after making
# it an absolute path.
#             value returned in "$func_normal_abspath_result"
func_normal_abspath ()
{
  # Start from root dir and reassemble the path.
  func_normal_abspath_result=
  func_normal_abspath_tpath=$1
  func_normal_abspath_altnamespace=
  case $func_normal_abspath_tpath in
    "")
      # Empty path, that just means $cwd.
      func_stripname '' '/' "`pwd`"
      func_normal_abspath_result=$func_stripname_result
      return
    ;;
    # The next three entries are used to spot a run of precisely
    # two leading slashes without using negated character classes;
    # we take advantage of case's first-match behaviour.
    ///*)
      # Unusual form of absolute path, do nothing.
    ;;
    //*)
      # Not necessarily an ordinary path; POSIX reserves leading '//'
      # and for example Cygwin uses it to access remote file shares
      # over CIFS/SMB, so we conserve a leading double slash if found.
      func_normal_abspath_altnamespace=/
    ;;
    /*)
      # Absolute path, do nothing.
    ;;
    *)
      # Relative path, prepend $cwd.
      func_normal_abspath_tpath=`pwd`/$func_normal_abspath_tpath
    ;;
  esac
  # Cancel out all the simple stuff to save iterations.  We also want
  # the path to end with a slash for ease of parsing, so make sure
  # there is one (and only one) here.
  func_normal_abspath_tpath=`$ECHO "$func_normal_abspath_tpath" | $SED \
        -e "$removedotparts" -e "$collapseslashes" -e "$finalslash"`
  while :; do
    # Processed it all yet?
    if test "$func_normal_abspath_tpath" = / ; then
      # If we ascended to the root using ".." the result may be empty now.
      if test -z "$func_normal_abspath_result" ; then
        func_normal_abspath_result=/
      fi
      break
    fi
    func_normal_abspath_tcomponent=`$ECHO "$func_normal_abspath_tpath" | $SED \
        -e "$pathcar"`
    func_normal_abspath_tpath=`$ECHO "$func_normal_abspath_tpath" | $SED \
        -e "$pathcdr"`
    # Figure out what to do with it
    case $func_normal_abspath_tcomponent in
      "")
        # Trailing empty path component, ignore it.
      ;;
      ..)
        # Parent dir; strip last assembled component from result.
        func_dirname "$func_normal_abspath_result"
        func_normal_abspath_result=$func_dirname_result
      ;;
      *)
        # Actual path component, append it.
        func_normal_abspath_result=$func_normal_abspath_result/$func_normal_abspath_tcomponent
      ;;
    esac
  done
  # Restore leading double-slash if one was found on entry.
  func_normal_abspath_result=$func_normal_abspath_altnamespace$func_normal_abspath_result
}

# func_relative_path SRCDIR DSTDIR
# generates a relative path from SRCDIR to DSTDIR, with a trailing
# slash if non-empty, suitable for immediately appending a filename
# without needing to append a separator.
#             value returned in "$func_relative_path_result"
func_relative_path ()
{
  func_relative_path_result=
  func_normal_abspath "$1"
  func_relative_path_tlibdir=$func_normal_abspath_result
  func_normal_abspath "$2"
  func_relative_path_tbindir=$func_normal_abspath_result

  # Ascend the tree starting from libdir
  while :; do
    # check if we have found a prefix of bindir
    case $func_relative_path_tbindir in
      $func_relative_path_tlibdir)
        # found an exact match
        func_relative_path_tcancelled=
        break
        ;;
      $func_relative_path_tlibdir*)