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#!/bin/sh
# original mktexlsr -- create or rebuild ls-R.
# 
# (If you change or delete the word `original' on the previous line,
# installation won't write this script over yours.)
#
# Suitable for calling from cron, as in:
# 0 * * * * cd /your/texmf/root && /usr/local/bin/mktexlsr
# unless the scripts live in a different directory than the 'kpseaccess',
# 'kpsestat', 'kpsereadlink', and 'kpsewhich' binaries.
# 
# Originally written as `texhash' by Thomas Esser
# <te@dbs.uni-hannover.de>, Okt., 1994.
# Public domain.

version='$Id: mktexlsr 8399 2008-05-28 22:19:34Z karl $'
progname=`echo $0 | sed 's%.*/%%'`
usage="Usage: $progname [DIR]...

The only options are --help, --version, --verbose, --quiet, and --silent.
If standard input is a terminal, --verbose is on by default.
--quiet and --silent are synonyms, and cancel --verbose.

Rebuild all necessary ls-R filename databases completely. If one or
more arguments DIRS are given, these are used as texmf directories to
build ls-R for. Else all directories in the search path for ls-R files
(\$TEXMFDBS) are used."

# MS-DOS and MS-Windows define $COMSPEC or $ComSpec and use `;' to separate
# directories in path lists whereas Unix uses `:'.  Make an exception for
# Cygwin, which pretends to be UNIX.
# Create a variable that holds the right character to be used by the scripts.
DOSISH=no
case `uname -s` in
  CYGWIN*|Cygwin*|cygwin*) ;;
  *) if test -n "$COMSPEC" || test -n "$ComSpec"; then DOSISH=yes; fi
esac
if test "$DOSISH" = "no"; then SEP=':'; else SEP=';';fi

# Add the location of the script to the PATH if necessary.  This must
# be done before kpsewhich can be called, and thus cannot be put into
# mktex.opt.
dirname=`echo $0 | sed 's%/*[^/][^/]*$%%'`
case $dirname in
  "") # Do nothing
      ;;
  /* | [A-z]:/*) # Absolute name
      PATH="$dirname$SEP$PATH"
      export PATH ;;
   *)  # Relative name
      PATH="`pwd`/$dirname$SEP$PATH"
      export PATH ;;
esac

if tty -s; then verbose=true; else verbose=false; fi

# A copy of some stuff from mktex.opt, so we can run in the presence of
# terminally damaged ls-R files.
while test $# -gt 0; do
  if test "x$1" = x--help || test "x$1" = x-help; then
    echo "$usage"
    exit 0
  elif test "x$1" = x--version || test "x$1" = x-version; then
    echo "`basename $0` $version"
    kpsewhich --version
    exit 0
  elif test "x$1" = x--verbose || test "x$1" = x-verbose; then
    verbose=true
  elif test "x$1" = x--quiet || test "x$1" = x--silent \
       || test "x$1" = x-quiet || test "x$1" = x-silent ; then
    verbose=false
  fi
  shift
done

# mktexupd and mktexlsr make sure they're coordinated via this.  A copy
# is found mktex.opt.
ls_R_magic='% ls-R -- filename database for kpathsea; do not change this line.'
# The old string, which should continue to work.
old_ls_R_magic='% ls-R -- maintained by MakeTeXls-R; do not change this line.'

trap 'cd / ; test -z "$db_dir_tmp" || rm -rf "$db_dir_tmp"; exit' 0 1 2 3 7 13 15

# Get list of directories from $TEXMFDBS; eliminate duplicates.
test $# = 0 && {
  OIFS=$IFS
  IFS='
'
  set x `kpsewhich --show-path=ls-R | tr : '
' | sort | uniq`; shift
  IFS=$OIFS
}

for TEXMFLS_R in "$@"; do
  # Prepend cwd if the directory was relative.
  case "$TEXMFLS_R" in
  "") continue ;;  # Strictly speaking, it is an error if this case is taken.
  /* | [A-z]:/*) ;;
  *)  TEXMFLS_R="`pwd`/$TEXMFLS_R"
  esac
  # Allow for ls-R and ls-r to exist.  But create ls-R if we're working
  # from scratch.
  if test -f "$TEXMFLS_R/ls-R"; then
    db_file="$TEXMFLS_R/ls-R"
  elif test -f "$TEXMFLS_R/ls-r"; then
    db_file="$TEXMFLS_R/ls-r"
  else
    db_file="$TEXMFLS_R/ls-R"
  fi
  # Follow a possible symlink to get the right filesystem. 
  # The '|| true' construct prevents an sh -e aborting.
  db_readlink=`kpsereadlink "$TEXMFLS_R/ls-R" 2>/dev/null` || true
  case "$db_readlink" in
  "") ;;
  /* | [A-z]:/*) db_file="$db_readlink" ;;
  *)  db_file="$TEXMFLS_R/$db_readlink"
  esac
  db_dir=`echo "$db_file" | sed 's%/[^/][^/]*$%%'` # can't rely on dirname

  test -d "$db_dir" || continue
  test -w "$db_dir" || { echo "$progname: $db_dir: directory not writable. Skipping..." >&2; continue; }

  if test ! -f "$db_file"; then
    cp /dev/null "$db_file"
    # Use same permissions as parent directory, minus x,s, or t bits.
    chmod `kpsestat -xst "$db_dir"` "$db_file"
  elif test -s "$db_file" \
       && test "x`sed '1s/
$//;1q' \"$db_file\"`" != "x$ls_R_magic" \
       && test "x`sed '1s/
$//;1q' \"$db_file\"`" != "x$old_ls_R_magic"; then
    echo "$progname: $db_file lacks magic string. Skipping..." >&2
    continue
  fi

  # Skip if we cannot write the file:
  kpseaccess -w "$db_file" || { echo "$progname: $db_file: no write permission. Skipping..." >&2; continue; }

  db_dir_tmp="$db_dir/lsR$$.tmp"
  (umask 077 && mkdir "$db_dir_tmp" ) \
    || { echo "$progname: could not create directory '$db_dir_tmp'. Skipping..." >&2; continue; }
  db_file_tmp="$db_dir_tmp/lsR$$.tmp"
  rm -f "$db_file_tmp"

  $verbose && echo "$progname: Updating $db_file... " >&2
  echo "$ls_R_magic" >"$db_file_tmp"

  # The main task. We put ./: in the output, so top-level files can be
  # found via ls-R. Probably irrelevant in practice.  The sed command
  # inserts the leading ./ for directory names, and removes ., .., and
  # version control entries from the list.  Also omit contents of any
  # the version directories; sed apparently requires that we do that
  # operation in a separate invocation.  We do not try to support colons
  # in directory names.
  # 
  echo "./:" >>"$db_file_tmp"
  vc_dirs='\.\(bzr\|git\|hg\|svn\)\|CVS\|RCS\|_darcs'
  (cd "$TEXMFLS_R" && \ls -LRa 2>/dev/null) \
   | sed -e '/^$/{n;s%^\./%%;s%^%./%;}; /^\.$/d; /^\.\.$/d; /^'$vc_dirs'$/d;' \
         -e '/^[\.\/]*lsR[0-9]*\.tmp:*$/d' \
   | sed -e /$vc_dirs'.*:$/,/^$/d' \
   >>"$db_file_tmp"

  # To be really safe, a loop.
  until PERMS=`kpsestat = "$db_file"`; do sleep 1; done
  chmod $PERMS "$db_file_tmp"
  rm -f "$db_file"
  mv "$db_file_tmp" "$db_file"
  rm -rf "$db_dir_tmp"
done
$verbose && echo "$progname: Done." >&2
exit 0