#!/bin/sh
######################################################################
# tirblog - Generate tir blog for directory tree.
# Created 2006-8-15 by David Meyer.
######################################################################

# Identification #####################################################

PROGRAM='tirblog'
VERSION=0.0
COPYRIGHT='Copyright (C) 2006 David Meyer'
DESCRIPTION='Generate tir blog for directory tree.'
USAGE="Usage: $0 [-Vh] [DIRECTORY]"
CONTACT='David Meyer <papa@jtan.com>'

# Initialize environment #############################################

unset IFS
PATH=
BASENAME=/usr/bin/basename
CAT=/bin/cat
ECHO=/bin/echo
FIND=/usr/bin/find
GREP=/bin/grep
HEAD=/bin/head
LS=/bin/ls
SED=/bin/sed
TAIL=/usr/bin/tail

: ${TIRROOT:=/mnt/card/Document/cave/green}


# Arguments ##########################################################

while getopts Vh option
do	case $option in
	V )	echo"$PROGRAM $VERSION"
		$ECHO $COPYRIGHT
		exit 0
		;;
	h )	$CAT << ENDHELP
$USAGE

$DESCRIPTION
DIRECTORY defaults to current directory.

Options:
	-V	Display version number
	-h	Display this help message

Report bugs to $CONTACT.
ENDHELP
		exit 0
		;;
	* )	$ECHO $USAGE >&2
		exit 1
		;;
	esac
done

shift $(( $OPTIND-1 ))

HERE=${1-.}

# Functions ##########################################################

cat_filter_root_path() {
	if [ $HERE -ef $TIRROOT ]
	then	$SED -e 's:\.\./:./:' $1
	else	$CAT $1
	fi
}

inherit_fn() {
	fn=${2:?"Insufficient arguments: inherit_fn $@"}
	if [ -f $fn ]
	then	eval $1=$fn
	elif [ -f $TIRROOT/$fn ]
	then	eval $1=$TIRROOT/$fn
	else	eval $1=${3:-/dev/null}
	fi
}

set_long_day() {
	if [ $# -lt 2 ]
	then	$ECHO "$0: set_long_day: Insufficient arguments" >&2
		exit 1
	fi

	case $2 in
	Sun | Mon | Fri )
		eval $1=${2}day ;;
	Tue )	eval $1=Tuesday ;;
	Wed )	eval $1=Wednesday ;;
	Thu )	eval $1=Thursday ;;
	Sat )	eval $1=Saturday ;;
	* )	eval $1='???' ;;
	esac
}

set_long_month() {
	if [ $# -lt 2 ]
	then	$ECHO "$0: set_long_month: Insufficient arguments" >&2
		exit 1
	fi

	case $2 in
	Jan )	eval $1=January ;;
	Feb )	eval $1=February ;;
	Mar )	eval $1=March ;;
	Apr )	eval $1=April ;;
	May )	eval $1=May ;;
	Jun )	eval $1=June ;;
	Jul )	eval $1=July ;;
	Aug )	eval $1=August ;;
	Sep )	eval $1=September ;;
	Oct )	eval $1=October ;;
	Nov )	eval $1=November ;;
	Dec )	eval $1=December ;;
	* )	eval $1='???' ;;
	esac
}

parse_blog_ls_e() {
	if [ $# -lt 8 ]
	then	$ECHO "$0: parse_blog_ls_e: Insufficient arguments" >&2
		exit 1
	fi

	set_long_day weekday $3
	set_long_month month $4
	date="$weekday, $month $5, $7"
	eval $1='$date'
	eval $2=$8
}

parse_blog_file() {
	if [ $# -lt 4 ]
	then	$ECHO "$0: parse_blog_file: Insufficient arguments" >&2
		exit 1
	fi

#	<file>	::= ./<category>/<title>.<ext>
	base=${4%.*}
	path=${base%/*}
	category=${path#./}

	if [ x"$category" = x"." ]
	then	eval $1=Main
	else	eval $1=$category
	fi

	eval $2=${base##*/}

	if [ x"$base" = x"$4" ]
	then	eval $3=
	else	eval $3=${4##*.}
	fi
}


# Main driver ########################################################

cd $HERE

test -f .title && title=`$CAT .title`
test -f $TIRROOT/.title && site=`$CAT $TIRROOT/.title`

if [ x"${title:=`$$BASENAME $HERE`}" = x"." ]
then	title="Site under construction"
fi

$ECHO "<h1>$title</h1>"
$ECHO '<h2>New and Updated</h2>'

$ECHO '<div id="blog">'

articles=`$FIND . -name "[A-Z0-9]*.html"`
prev_date=''

$LS -te $articles | while read blog
do	parse_blog_ls_e blog_date blog_file $blog

	if [ x"$blog_date" != x"$prev_date" ]
	then	test "$prev_date" && $ECHO '<hr />'
		$ECHO "<h3>$blog_date</h3>"
		prev_date="$blog_date"
	fi

	parse_blog_file blog_category blog_title blog_ext $blog_file
	$ECHO "<p style="float:right">(<a href=\"${blog_category}/index.html\">$blog_category</a>)</p>"
	$ECHO "<h4><a href=\"$blog_file\">$blog_title</a></h4>"

	if [ -f $blog_category/$blog_title.txt ]
	then	blog_teaser=`$HEAD -n3 $blog_category/$blog_title.txt | $TAIL -1`
	elif [ -f $blog_category/$blog_title ]
	then	blog_teaser=`$HEAD -n3 $blog_category/$blog_title | $TAIL -1 | cut -d' ' -f2-`
	else	blog_teaser=`$GREP -A10 '<h1>' $blog_file | $TAIL -10 | $GREP -E '<p>|<li>|<td>|<blockquote>|<dt>' | $HEAD -n1 | $SED -e 's/<[^<]*>//g'`
	fi

	if [ "$blog_teaser" ]
	then	$ECHO -n "<p style="clear=both">$blog_teaser "
		$ECHO "<a href=\"$blog_file\">&hellip;</a></p>"
	fi
done

test $prev_date && $ECHO '<hr />'
$ECHO '</div><!-- end div blog -->'

exit 0