office/lowdown: Added (markdown translator).

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

office/lowdown/README

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+lowdown is a Markdown translator producing HTML5 and roff documents in
+the ms and man formats. It's just clean, secure, open source C code with
+no dependencies. Its canonical documentation is lowdown(1) for the
+formatter, lowdown(5) for the syntax, and the library interface at
+lowdown(3).
+
+lowdown started as a fork of hoedown to add sandboxing (pledge(2),
+capsicum(4), or sandbox_init(3)) and roff output to securely generate
+PDFs on OpenBSD with just mandoc(1).
+
+It has grown to admit many more extensions and outputs, and can even be
+used to show the difference between two Markdown documents with
+lowdown-diff, documented as the lowdown diffing engine. This uses a
+tree-based difference algorithm to show semantically-valid Markdown
+differences.

office/lowdown/lowdown.SlackBuild

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+#!/bin/sh
+
+# Slackware build script for lowdown
+
+# Copyright 2020, Charles A. Daniels, United States
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
+#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+PRGNAM=lowdown
+VERSION=${VERSION:-0.5.4}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+CWD=$(pwd)
+TMP=${TMP:-/tmp/SBo}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+if [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "i686" ]; then
+  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "x86_64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
+else
+  SLKCFLAGS="-O2"
+  LIBDIRSUFFIX=""
+fi
+
+set -e
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT
+cd $TMP
+rm -rf $PRGNAM-$VERSION
+tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
+cd $PRGNAM-$VERSION
+chown -R root:root .
+find -L . \
+ \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
+  -o -perm 511 \) -exec chmod 755 {} \; -o \
+ \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
+  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+
+CFLAGS="$SLKCFLAGS" \
+CXXFLAGS="$SLKCFLAGS" \
+./configure \
+	PREFIX="/usr"
+
+make
+make install DESTDIR=$PKG
+
+find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
+  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+find $PKG/usr/man -type f -exec gzip -9 {} \;
+for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done
+
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a \
+  LICENSE.md \
+  $PKG/usr/doc/$PRGNAM-$VERSION
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}

office/lowdown/lowdown.info

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+PRGNAM="lowdown"
+VERSION="0.5.4"
+HOMEPAGE="https://kristaps.bsd.lv/lowdown/"
+DOWNLOAD="https://kristaps.bsd.lv/lowdown/snapshots/lowdown-0.5.4.tar.gz"
+MD5SUM="df02cae66bc9f26aeb5f14836388de93"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES=""
+MAINTAINER="Charles Daniels"
+EMAIL="charles@cdaniels.net"

office/lowdown/slack-desc

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+# HOW TO EDIT THIS FILE:
+# The "handy ruler" below makes it easier to edit a package description.  Line
+# up the first '|' above the ':' following the base package name, and the '|' on
+# the right side marks the last column you can put a character in.  You must make
+# exactly 11 lines for the formatting to be correct.  It's also customary to
+# leave one space after the ':'.
+
+       |-----handy-ruler------------------------------------------------------|
+lowdown: lowdown (simple markdown translator)
+lowdown:
+lowdown: lowdown is a Markdown translator producing HTML5 and roff documents
+lowdown: in the ms and man formats. It's just clean, secure, open source C code
+lowdown: with no dependencies. Its canonical documentation is lowdown(1) for
+lowdown: the formatter, lowdown(5) for the syntax, and the library interface
+lowdown: at lowdown(3).
+lowdown:
+lowdown: Homepage: https://github.com/Symbian9/lowdown
+lowdown: