#! /bin/sh

set -e

# Check command line.
if test ! -d "$1" || test $# != 1; then
    cat <<EOF
$0: HTML documentation generator for Open vSwitch
usage: $0 srcdir

The VERSION environment variable should be set to the Open vSwitch version.
Must be invoked from an Open vSwitch build directory.
Most conveniently invoked via "make dist-docs".
EOF
    exit 1
fi

# Parse command line.
srcdir=$1
shift

# Check for programs we'll need.
search_path () {
    save_IFS=$IFS
    IFS=:
    for dir in $PATH; do
        IFS=$save_IFS
        if test -x "$dir/$1"; then
            return 0
        fi
    done
    IFS=$save_IFS
    echo >&2 "$0: $1 not found in \$PATH, please install and try again"
    exit 1
}
search_path man
search_path ps2pdf

# Create dist-docs directory.
distdir=dist-docs
abs_distdir=`pwd`/dist-docs
rm -rf $distdir
mkdir $distdir

# Install manpages.
${MAKE-make} install-man install-man-rst mandir="$abs_distdir"/man
(cd $distdir && mv `find man -type f` . && rm -rf man)
manpages=`cd $distdir && echo *`

# Start writing index.html.
exec 3>$distdir/index.html
cat >&3 <<EOF
<html><head>
  <meta charset="UTF-8"></head>
  <link rel="stylesheet" type="text/css" href="style.css">
  <title>Open vSwitch $VERSION Documentation</title>
</head><body>
<h1>Open vSwitch $VERSION Manpages</h1>
<table>
EOF

# Add manpages to index.html, translating them into PDF, HTML, and plain text.
# The HTML is just slightly marked up from the plain text version; although
# groff supports better HTML output, on my system some of the OVS manpages
# cause the groff HTML output engine to segfault (!).
(cd $distdir
 for manpage in $manpages; do
     man -l -Tps $manpage | ps2pdf - > $manpage.pdf
     GROFF_NO_SGR=1 man -l -Tutf8 $manpage | sed 's/.//g' > $manpage.txt
     (echo '<html><head><meta charset="UTF-8"></head><body><pre>'
      GROFF_NO_SGR=1 man -l -Tutf8 $manpage | sed '
# Change bold and underline via backspacing into bracketing with control
# characters.  We cannot directly translate them to HTML because <> need
# to be escaped later.  (We cannot escape <> first because bold or
# underlined escaped characters would be mis-processed.)
s,\(.\)\1,\1,g
s,_\(.\),\1,g

# Drop redundant font changes, to keep from having every character have
# a separate tag pair.
s,,,g
s,,,g

# Escape special characters.
s,&,\&amp;,g
s,<,\&lt;,g
s,>,\&gt;,g

# Translate control characters to HTML.
s,,<b>,g
s,,</b>,g
s,,<u>,g
s,,</u>,g
'
      echo '</pre></body></html>'
     ) > $manpage.html

     name=`echo $manpage | sed 's/\.\([0-9]\)$/(\1)/'`
     echo "  <tr><td>$name</td><td><a href=\"$manpage.pdf\">PDF</a>, <a href=\"$manpage.html\">HTML</a>, <a href=\"$manpage.txt\">plain text</a></td></tr>"
 done
) >&3
cat >&3 <<EOF
</table>
</body></html>
EOF

# Create CSS style file.
cat >$distdir/style.css <<'EOF'
div { vertical-align:top; }
p {
    vertical-align:baseline;
}
a {
    text-decoration: none;
    font-weight: 700;
}
a:hover {
    color:#444;
}
a:visited {
    color:#447099;
}
a:link {
    color:#447099;
}

body {
    font-family: Arial,Helvetica,sans-serif;
    font-size: 14px;
    line-height: 1.5em;
    color: #444;
    background-color:#f5f5f5;
}
EOF
