#!/bin/sh

# srctoman - extract manual page from source file comment

# @(#) srctoman.sh 1.2 11/4/89 15:56:22

LANG=

# process arguments

while :
do
    case $1 in
 [0-9]) SECT=$1;;
     -) LANG=$1; B='[#:]';;
  -awk) LANG=$1; B='#';;
    -c) LANG=$1; B='\/\*';;
    -f) LANG=$1; B='[Cc]';;
   -mk) LANG=$1; B='#';;
 -n|-t) LANG=$1; B='\\"';;
    -p) LANG=$1; B='{';;
    -r) LANG=$1; B='#';;
    -C) LANG=$1; B=$2; shift;;
    -*) ERROR="unknown option: $1"; break;;
    "") ERROR="missing file argument"; break;;
     *) break;;
    esac
    shift
done

# check error status

case $ERROR in
"") ;;
 *) echo "$0: $ERROR" 1>&2
    echo "usage: $0 [-|-awk|-c|-f|-mk|-n|-p|-t|-r|-C] [section] file(s)" 1>&2; exit 1;;
esac

# set up for file suffix processing

case $LANG in
"") sh='[:#]';	r='#';	rh=$r;	awk='#'; mk='#';
    c='\/\*';	h=$c;	y=$c;	l=$c;
    f='[Cc]';	fh=$f;	p='{';	ph=$p;
    ms='\\"';	nr=$ms;	mn=$ms;	man=$ms;
esac

# extract comments

for i in $*
do
    case $LANG in
    "") eval B\="\$`expr $i : '.*\.\([^.]*\)$'`"
	test "$B" || { echo "$0: unknown suffix: $i; assuming c" 1>&2; B=$c; }
    esac
    sed '
    /^'"$B"'++/,/^'"$B"'--/!d
    /^'"$B"'++/d
    /^'"$B"'--/d
    s/[ 	]*$//
    /^'"$B"' \([A-Z]\)/{
	s//\1/
	/^NAME[ 	]*$/{
	    N
	    s/^.*\n'"$B"'[ 	]*//
	    h
	    y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/
	    s/^.*$/.TH & '"$SECT"'\
.ad\
.fi\
.SH NAME/
	    p
	    g
	    s/[ 	][ 	]*[0-9][ 	]*$//
	    a\
\\-
	    p
	    d
	}
	/^SUMMARY/d
	/^DESCRIPTION/s//.SH &\
.ad\
.fi/
	/^BUGS/s//.SH &\
.ad\
.fi/
	/^DIAGNOSTICS/s//.SH &\
.ad\
.fi/
	/^[A-Z][A-Z][A-Z][^a-z]*$/s//.SH "&"\
.na\
.nf/
	p
	d
    }
    s/^'"$B"' *//
    s/^	//
    s/^[ 	]*$//
    /^\\"/d
' $i
done | expand

exit

#++
# NAME
#	srctoman 1
# SUMMARY
#	extract manual page from source file comment
# PACKAGE
#	sdetools
# SYNOPSIS
#	srctoman [-|-awk|-c|-f|-mk|-m|-n|-p|-t|-r|-C] [section] file(s)
# DESCRIPTION
#	\fIsrctoman\fR converts comments in various programming languages to
#	UNIX-style manual pages.
#	The command processes comments in the style of newsrc(1);
#	its standard output is suitable for formatting with nroff(1) or 
#	troff(1) using the "-man" macro package.  
#	Typically, srctoman is invoked from make(1) scripts.
#
#	Source files are processed in the indicated order; if no
#	files are specified the command produces no output.
#
#	The source file language can be specified through a command-line
#	option, or can be implied by the filename suffix.
#	The expected start-of-comment symbol is shown in the last column.
#
# .nf
# .ft C
	option	language	comment

	-	shell		[:#]
	-awk	awk		#
	-c	c		/*
	-f	fortran		[Cc]
	-mk	make		#
	-n	nroff		\\"
	-p	pascal		{
	-t	troff		\\"
	-r	ratfor		#
	-C	any language	next argument
#
	suffix	language	comment

	.awk	awk		#
	.c	c		/*
	.f	fortran		[Cc]
	.fh	fortran		[Cc]
	.h	c		/*
	.l	lex		/*
	.man	nroff,troff	\\"
	.mk	make		#
	.me	nroff,troff	\\"
	.ms	nroff,troff	\\"
	.nr	nroff,troff	\\"
	.p	pascal		{
	.ph	pascal		{
	.r	ratfor		#
	.rh	ratfor		#
	.sh	shell		[:#]
	.y	yacc		/*
# .ft
# .PP
# .fi
#
#	The required format of comments is discussed below, where SOC
#	stands for the start-of-comment symbol of the language being used.
# .IP o
#	Start of manual: SOC, followed by `++'.
# .IP o
#	Section heading: SOC, blank, section name in upper case.
# .IP o
#	All other text: SOC and subsequent blanks or tabs are removed.
#	Lines that do not start with SOC are left unchanged (useful for 
#	inclusion of program text).
# .IP o
#	End of manual: SOC, followed by `--'.
#	An end-of-comment may follow if the source file language requires this.
# .PP
#	The following manual sections receive a special treatment:
#	NAME and SUMMARY should appear at the beginning and in
#	this order; DESCRIPTION, DIAGNOSTICS and BUGS will be
#	right-margin adjusted.
#	Other sections may be added freely without confusing srctoman.
# COMMANDS
#	sh(1), sed(1), expand(1)
# SEE ALSO
#	newsrc(1)
# DIAGNOSTICS
#	The program complains if an unknown language is specified
#	of if the language cannot be deduced from the file suffix.
# AUTHOR(S)
#	W.Z. Venema
#	Eindhoven University of Technology
#	Department of Mathematics and Computer Science
#	Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
# CREATION DATE
#	Fri Jan 17 22:59:27 MET 1986
# STATUS
#	srctoman.sh 1.2 11/4/89 15:56:22 (draft)
#--
