#!/bin/sh
# makewhatis: create the whatis database
# Created: Sun Jun 14 10:49:37 1992
# Revised: Sat Jan  8 14:12:37 1994 by faith@cs.unc.edu
# Revised: Sat Mar 23 17:56:18 1996 by micheal@actrix.gen.nz
# Copyright 1992, 1993, 1994 Rickard E. Faith (faith@cs.unc.edu)
# May be freely distributed and modified as long as copyright is retained.
#
# Wed Dec 23 13:27:50 1992: Rik Faith (faith@cs.unc.edu) applied changes
# based on Mitchum DSouza (mitchum.dsouza@mrc-apu.cam.ac.uk) cat patches.
# Also, cleaned up code and make it work with NET-2 doc pages.
#
# makewhatis-1.4: aeb 940802, 941007, 950417
# Fixed so that the -c option works correctly for the cat pages
# on my machine. Fix for -u by Nan Zou (nan@ksu.ksu.edu).
# Many minor changes.
# The -s option is undocumented, and may well disappear again.
#
# Sat Mar 23 1996: Michael Hamilton (michael@actrix.gen.nz).
# I changed the script to invoke gawk only once for each directory tree.
# This speeds things up considerably (from 30 minutes down to 1.5 minutes
# on my 486DX66).
# 960401 - aeb: slight adaptation to work correctly with cat pages.
# 960510 - added fixes by brennan@raven.ca.boeing.com, author of mawk.
# 971012 - replaced "test -z" - it doesnt work on SunOS 4.1.3_U1.
# 980710 - be more careful with TMPFILE
#
# Note for Slackware users: "makewhatis -v -w -c" will work.

# %ExternalCopyright%
PATH=/usr/bin:/bin

DEFMANPATH=/usr/man
DEFCATPATH=/usr/man/preformat:/usr/man

# Find a place for our temporary files. If security is not a concern, use
#	TMPFILE=/tmp/whatis$$; TMPFILEDIR=none
# Of course makewhatis should only have the required permissions
# (for reading and writing directories like /usr/man).
# We try here to be careful (and avoid preconstructed symlinks)
# in case makewhatis is run as root, by creating a subdirectory of /tmp.
# If that fails we use $HOME.
# The code below uses  test -O  which doesnt work on all systems.
TMPFILE=$HOME/whatis$$
TMPFILEDIR=/tmp/whatis$$
if [ ! -d $TMPFILEDIR ]; then
	mkdir $TMPFILEDIR
	chmod 0700 $TMPFILEDIR
	if [ -O $TMPFILEDIR ]; then
		TMPFILE=$TMPFILEDIR/w
	fi
fi

topath=manpath

defmanpath=$DEFMANPATH
defcatpath=

sections="1 2 3 4 5 6 7 8 9 n l"

for name in $*
do
if [ -n "$setsections" ]; then
	setsections=
	sections=$name
	continue
fi
case $name in
    -c) topath=catpath
	defmanpath=
	defcatpath=$DEFCATPATH
        continue;;
    -s) setsections=1
        continue;;
    -u) findarg="-ctime 0"
        update=1
        continue;;
    -v) verbose=1
	continue;;
    -w) manpath=`man --path`
	continue;;
    -*) echo "Usage: makewhatis [-u] [-v] [-w] [manpath] [-c [catpath]]"
	echo "       This will build the whatis database for the man pages"
	echo "       found in manpath and the cat pages found in catpath."
        echo "       -u: update database with new pages"
	echo "       -v: verbose"
	echo "       -w: use manpath obtained from \`man --path\`"
        echo "       [manpath]: man directories (default: $DEFMANPATH)"
	echo "       [catpath]: cat directories (default: the first existing"
	echo "           directory in $DEFCATPATH)"
        exit;;
     *) if [ -d $name ]
        then
            eval $topath="\$$topath":$name
        else
            echo "No such directory $name"
            exit
        fi;;
esac
done

manpath=`echo ${manpath-$defmanpath} | tr : ' '`
if [ x"$catpath" = x ]; then
   for d in `echo $defcatpath | tr : ' '`
   do
      if [ -d $d ]; then catpath=$d; break; fi
   done
fi
catpath=`echo ${catpath} | tr : ' '`

# first truncate all the whatis files that will be created new,
# then only update - we might visit the same directory twice
if [ x$update = x ]; then
   for pages in man cat
   do
      eval path="\$$pages"path
      for mandir in $path
      do
         cp /dev/null $mandir/whatis
      done
   done
fi

for pages in man cat
do
   export pages
   eval path="\$$pages"path
   for mandir in $path
   do
     if [ x$verbose != x ]; then
        echo "about to enter $mandir" > /dev/tty
     fi
     if [ -s ${mandir}/whatis -a $pages = man ]; then
        if [ x$verbose != x ]; then
           echo skipping $mandir - we did it already > /dev/tty
        fi
     else      
       here=`pwd`
       cd $mandir
       for i in $sections
       do
         if [ -d ${pages}$i ]
         then
            cd ${pages}$i
            section=$i
            export section verbose
	    find . -name '*' $findarg -print | /usr/bin/gawk '

	    function readline() {
	      if (use_zcat) {
		result = (pipe_cmd | getline);
		if (result < 0) {
		  print "Pipe error: " pipe_cmd " " ERRNO > "/dev/stderr";
		}
	      } else {
		result = (getline < filename);
		if (result < 0) {
		  print "Read file error: " filename " " ERRNO > "/dev/stderr";
		}
	      }
	      return result;
	    }
	    
	    function closeline() {
	      if (use_zcat) {
		return close(pipe_cmd);
	      } else {
		return close(filename);
	      }
	    }
	    
	    function do_one() {
	      after = 0; insh = 0; thisjoin = 1; charct = 0;

	      if (verbose) {
		print "adding " filename > "/dev/tty"
	      }
	      
	      use_zcat = (filename ~ /\.Z$/ || filename ~ /\.z$/ ||
			  filename ~ /\.gz$/);
	      match(filename, "/[^/]+$");
	      progname = substr(filename, RSTART + 1, RLENGTH - 1);
	      if (match(progname, "\\." section "[A-Za-z]+")) {
		actual_section = substr(progname, RSTART + 1, RLENGTH - 1);
	      } else {
		actual_section = section;
	      }
	      sub(/\..*/, "", progname);
	      if (use_zcat) {
		pipe_cmd = "zcat " filename;
	      }
	    
	      while (readline() > 0) {
		gsub(/.\b/, "");
		if (($1 ~ /^\.[Ss][Hh]/ && $2 ~ /[Nn][Aa][Mm][Ee]/) ||
		  (pages == "cat" && $1 ~ /^NAME/)) {
		    if (!insh)
		      insh = 1;
		    else {
		      printf "\n";
		      closeline();
                      return;
		    }
		} else if (insh) {
		  if ($1 ~ /^\.[Ss][HhYS]/ ||
		    (pages == "cat" &&
		    ($1 ~ /^S[yYeE]/ || $1 ~ /^DESCRIPTION/ ||
		    $1 ~ /^COMMAND/ || $1 ~ /^OVERVIEW/ ||
		    $1 ~ /^STRUCTURES/ || $1 ~ /^INTRODUCTION/))) {
		      # end insh for Synopsis, Syntax, but also for
		      # DESCRIPTION (e.g., XFree86.1x),
		      # COMMAND (e.g., xspread.1)
		      # OVERVIEW (e.g., TclCommandWriting.3)
		      # STRUCTURES (e.g., XEvent.3x)
		      # INTRODUCTION (e.g., TclX.n)
		      printf "\n";
		      closeline();
                      return; 
		  } else { # derived from Tom Christiansen perl script
		      if (!after && $0 ~ progname"-") {  # Fix old cat pages
			  sub(progname"-", progname" - ");
		      }
		      gsub(/	/, " ");        # Translate tabs to spaces
		      gsub(/  +/, " ");         # Collapse spaces
		      gsub(/ *, */, ", ");      # Fix comma spacings
		      sub(/^ /, "");            # Kill initial spaces
		      sub(/ $/, "");            # Kill trailing spaces
		      sub(/__+/, "_");          # Collapse underscores
		      if ($0 ~ /[^ ]-$/) {
			sub(/-$/, "");          # Handle Hyphenations
			nextjoin = 1;
		      } else
			nextjoin = 0;
			sub(/^.[IB] /, "");       # Kill bold and italics
			sub(/^.Nm /, "");         # Kill bold
			sub(/^.Tn /, "");         # Kill normal
			sub(/^.Li /, "");         # Kill .Li
			sub(/^.Dq /, "");         # Kill .Dq
			sub(/^.Nd */, "- ");      # Convert .Nd to dash
			gsub(/\\f[PRIB0123]/, "");   # Kill font changes
			gsub(/\\s[-+0-9]*/, "");     # Kill size changes
			gsub(/\\&/, "");             # Kill \&
			gsub(/\\\((ru|ul)/, "_");    # Translate
			gsub(/\\\((mi|hy|em)/, "-"); # Translate
			gsub(/\\\*\(../, "");        # Kill troff strings
			sub(/^\.\\\".*/, "");        # Kill comments
			gsub(/\\/, "");              # Kill all backslashes
			if ($1 ~ /^\.../ || $1 == "") {
			  if (after && !needmore) {
			    printf "\n";
			    thisjoin = 1;
			    charct = 0;
			    after = 0;
			  }
			} else {
			  if ($0 ~ /^- /) {
			    sub("- ", " - ");
			  } else if (!thisjoin && $0 !~ /^- /) {
			    printf " ";
			    charct += 1;
			  }
			  thisjoin = nextjoin;
			  if ($0 !~ / - / && $0 !~ / -$/ && $0 !~ /^- /) {
			    printf "%s", $0;
			    charct += length();
			    needmore = 0;
			  } else {
			    after = 1
			    if ($0 ~ / - /) {
			      where = match( $0 , / - /);
			    } else if ($0 ~ / -$/) {
			      where = match( $0, / -$/);
			    } else {
			      where = 1;
			    }
			    if ((width = 20-charct) < 0) width=0
			    printf "%-*s", width, sprintf( "%s (%s)",
			    substr( $0, 1, where-1 ), actual_section );
			    printf "%s", substr( $0, where )
			    if ($0 ~ /- *$/) {
			      needmore = 1;
			    } else {
			      needmore = 0;
			    }
			  }
			}
		      }
		   }
		}
	      closeline();
	    }

            {			# Main action - process each filename read in.
	      filename = $0;
	      do_one();
	    }
	    ' pages=$pages section=$section verbose=$verbose
            cd ..
         fi
       done > $TMPFILE

       cd $here

       # kludge for Slackware's /usr/man/preformat
       if [ $mandir = /usr/man/preformat ]
       then
         mandir1=/usr/man
       else
         mandir1=$mandir
       fi

       if [ -f ${mandir1}/whatis ]
       then
         cat ${mandir1}/whatis >> $TMPFILE
       fi
       sed '/^$/d' < $TMPFILE | sort | uniq > ${mandir1}/whatis

       chmod 644 ${mandir1}/whatis
       rm $TMPFILE
     fi
   done
done

# remove the dir if we created it
if [ $TMPFILE = $TMPFILEDIR/w ]; then
	rmdir $TMPFILEDIR
fi