sdn/sdn-view

#!/bin/sh -e
# sdn-view: a viewer for sdn that makes use of Midnight Commander configuration
# to make more kinds of files directly viewable

if [ "$#" -ne 1 ]
then
	echo "Usage: $0 FILE" >&2
	exit 2
fi

# This handles both MC_DATADIR and odd installation locations.
datadir=
if command -v mc >/dev/null
then datadir=$(mc --datadir | sed 's/ (.*)$//')
fi

config=
for dir in "$HOME"/.config/mc "$datadir" /etc/mc
do
	if [ -n "$dir" -a -f "$dir/mc.ext.ini" ]
	then
		config=$dir/mc.ext.ini
		break
	fi
done

# This is often used in %env{} expansion, so let's be on the same page.
export PAGER=${PAGER:-less}

export MC_EXT_FILENAME=$(realpath "$1")
export MC_EXT_BASENAME=$(basename "$1")
export MC_EXT_CURRENTDIR=$(dirname "$MC_EXT_FILENAME")
output=$(sdn-mc-ext <"$config" "$(file -Lbz "$1")" \
	"$MC_EXT_FILENAME" "$MC_EXT_BASENAME" "$MC_EXT_CURRENTDIR" View || :)
kind=$(echo "$output" | sed -n 1p)
command=$(echo "$output" | sed -n 2p)

case "$kind" in
view)
	if [ -n "$command" ]
	then eval "$command" | "$PAGER"
	else "$PAGER" -- "$MC_EXT_FILENAME"
	fi
	;;
'')
	if [ -n "$command" ]
	then eval "$command"
	else "$PAGER" -- "$MC_EXT_FILENAME"
	fi
	;;
*)
	echo "Unsupported: $kind" >&2
	exit 1
esac