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#!/usr/bin/env sh

WORKDIR=$PWD
OUTDIR=/var/www/blog/
verbose=0 # Variables to be evaluated as shell arithmetic should be initialized to a default or validated beforehand.

if [ ! "$(command -v cmark)" ]; then
	echo "cmark not installed in $PATH"
fi

usage="$(basename "$0") [-h] [-v -w WORKDIR -f FILE]

where:
    -w  set the working directory (default: ${WORKDIR})
    -o  set the output directory (default: ${OUTDIR})

    -h  show this help text
    -v  verbose output (multiple flags increase verbosity)
        (ex: '-v -v')
"

while :; do
        case $1 in
        -h | -\? | --help) # Call a "show_help" function to display a synopsis, then exit.
                echo "$usage"
                exit
                ;;
        -v)
                verbose=$((verbose + 1)) # Each -v argument adds 1 to verbosity.
                ;;
        -w) # Takes an option argument, ensuring it has been specified.
                if [ -n "$2" ]; then
                        WORKDIR=$2
                        shift
                fi
                ;;
        -w=?*)
                WORKDIR=${1#*=} # Delete everything up to "=" and assign the remainder.
                ;;
        -w=) # Handle the case of an empty --file=
                printf 'ERROR: "-w" requires a non-empty option argument.\n' >&2
                exit 1
                ;;
        -o) # Takes an option argument, ensuring it has been specified.
                if [ -n "$2" ]; then
                        OUTDIR=$2
                        shift
                fi
                ;;
        -o=?*)
                OUTDIR=${1#*=} # Delete everything up to "=" and assign the remainder.
                ;;
        -o=) # Handle the case of an empty --file=
                printf 'ERROR: "-o" requires a non-empty option argument.\n' >&2
                exit 1
                ;;
        --) # End of all options.
                shift
                break
                ;;
        -?*)
                printf 'WARN: Unknown option (ignored): %s\n' "$1" >&2
                ;;
        *) # Default case: If no more options then break out of the loop.
                break ;;
        esac
        shift
done

#### HEADER ####
HEADER=$(cat <<EOF
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Glue Code Journal</title> <style type="text/css"> body{margin: 40px auto; max-width: 650px; line-height: 1.6; font-size: 18px; color: #444; padding: 0 10px} h1, h2, h3{line-height: 1.2} img{width: 100%; max-width: 100%; height: auto;}</style> </head>

EOF
)

#### FOOTER ####
FOOTER=$(cat <<EOF

</body></html>
EOF
)
### PROCESS Files ####
# Make out dir
if [ ! -d "${OUTDIR}" ]; then mkdir ${OUTDIR} ; fi

MDLIST=$(eval "find ${WORKDIR} -type f -name \"*.md\" ")
for m in $MDLIST; do
	# shortpath trims the working directory prefix and the '.git' suffix from the directory
        shortpath=$(eval "echo $m | sed -e 's,${WORKDIR}/,,' ")
        dirpath=$(eval "echo $m | sed -e 's,${WORKDIR}/,,' -e 's,/.*.md$,,' ")
        filename=$(eval "echo $m | sed -e 's,${WORKDIR}/,,' -e 's,${dirpath}/,,' -e 's,\.md,,' ")
	if [ $verbose -gt 0 ]; then
		echo "Processing: ${shortpath}"
	fi

	OUTPATH="${OUTDIR}/${dirpath}/${filename}.html"
	
	# Output directly to file if $dirpath ends in ".md" for root-level files
	case $dirpath in *.md)
	OUTPATH="${OUTDIR}/${filename}.html"
	;; 

	*)
	# Make the outdir if not ending in ".md"
	if [ ! -d "${OUTDIR}/${dirpath}" ]; then mkdir ${OUTDIR}/${dirpath} ; fi
	esac
	
	echo $HEADER > "${OUTPATH}"
	cmark --safe --validate-utf8 -t html --width 80 $m >> "${OUTPATH}"
	echo $FOOTER >> "${OUTPATH}"

	if [ $verbose -gt 0 ]; then
		echo "Created: ${OUTPATH}"
	fi
done