bash static site generator

rc

# Feel free to edit this config. Don't remove any options.

declare -A config=(

# Directories. No trailing slashes.
["content"]="content"
["output"]="www"
["templates"]="templates"

# Add .html extention to generated files
["extensions"]="no"

# Markdown command, must read from stdin and write to stdout
["markdown"]="markdown"

# This is a command to deploy the site, or possibly launch another script
# to deploy it if deployment is complicated.
["deploy"]="rsync"

# If another server is desired, change this command to start it.
["server"]="python -m SimpleHTTPServer 8000 &"

# use nginx and the provided config to serve extensionless files as html
#["server"]="nginx -c /home/rascul/site/nginx.conf"

)

site.sh

#!/usr/bin/env bash

shopt -s nullglob

server_pid=

# Load the config
if [[ ! -e rc ]]; then
	echo "rc file not found."
	exit 1
fi

. rc


stop_server() {
	if [[ "$server_pid" ]]; then
		kill $server_pid
	fi
	pkill -P $$
	exit
}

# checks if a source file is newer than the destination file, to determine if
# the source files should be generated or copied to the destination, or not
# $1 :: source file
# $2 :: destination file
file_newer() {
	if [[ -e "$1" && -e "$2" ]]; then
		if [[ $(stat -c %Y "$1") > $(stat -c %Y "$2") ]]; then
			return 0
		else
			return 1
		fi
	else
		return 0
	fi
}


# render a template
# $1 :: input file
# $2 :: output file
render_template() {
	declare -A matter
	content=
	m=
	
	# get the front matter, then the content
	while IFS= read -r line; do
		if [[ $line =~ ^---*$ ]]; then
			m=1
		elif [[ "$m" ]]; then
			content+="$line\n"
		else
			matter[${line/: *}]="${line/${line/: *}: }"
		fi
	done < "$1"
	
	if [[ ! "${matter[template]}" ]]; then
		printf 'no template in front matter\n' >&2 
		return 1
	fi
	
	# convert the markdown
	content=$(printf '%b' "$content" | ${config[markdown]})
	
	t="${config[output]}"
	matter[path]="${2#$t}"
	
	rm -f "$2"
	
	run=
	
	# fill in the template
	while IFS= read -r line; do
		if [[ $line =~ ^[[:blank:]]*\#\  ]]; then
			t=${line#${line%%[![:space:]]*}}
			run+="${t:2}\n"
			line=
		else
			if [[ "$run" ]]; then
				printf '%b' "$run" | /usr/bin/env bash
				run=
			fi
			
			while [[ $line =~ \{\{\ ([[:alpha:]]+)\ \}\} ]]; do
				m=${BASH_REMATCH[1]}
				if [[ $m = "content" ]]; then
					line=${line//\{\{ $m \}\}/$content}
				else
					line=${line//\{\{ $m \}\}/${matter[$m]}}
				fi
			done
		fi
		if [[ "$line" ]]; then
			printf '%b\n' "$line"
		fi
	done < "${config[templates]}/${matter[template]}" > "$2"
}


# recursively build the site
# $1 :: content directory
# $2 :: output directory
build_dir() {
	if [[ ! -d "$2" ]]; then
		mkdir -p "$2"
	fi
	
	for f in "$1"/*; do
		o="${f/${config[content]}/${config[output]}}"
		
		if [[ -d "$f" ]]; then
			build_dir "$f" "$o"
		else
			if [[ ${f##*.} = md ]]; then
				if [[ "${config[extensions]}" = "yes" ]]; then
					o="${o/%.md/.html}"
				else
					o="${o/%.md}"
				fi
				
				if file_newer "$f" "$o"; then
					printf '> %s\n' "$o"
					render_template "$f" "$o"
				fi
			elif file_newer "$f" "$o"; then
				printf '+ %s\n' "$o"
				cp "$f" "$o"
			fi
		fi
	done
}


# build command
command_build() {
	if [[ $1 = "full" ]]; then
		rm -rf "${config[output]}"
	fi
	build_dir "${config[content]}" "${config[output]}"
}


# serve command
command_serve() {
	echo "* full build and serve"
	command_build full
	echo "* press ctrl+c to quit"
	
	cd "${config[output]}"
	${config[server]} &
	server_pid=$!
	cd ..
	
	while true; do
		trap stop_server int
		inotifywait -qqr -e modify,move,create,delete \
			"${config[content]}" "${config[templates]}" &&
			command_build
	done
}


# what to do?
case $1 in
	help)
		shift
		command_help
		exit
		;;
	
	build)
		shift
		command_build "$@"
		exit
		;;
	
	serve)
		shift
		command_serve
		exit
		;;
esac