all: Bump to version 3 of static site generation

3 files changed, 204 insertions, 304 deletions

diff --git a/bin/func b/bin/func
new file mode 100644
index 0000000..af81d92
--- /dev/null
+++ b/bin/func
@@ -0,0 +1,187 @@
+#!/bin/sh
+
+media_dir="media"
+src_dir="src"
+tmp_dir="tmp"
+out_dir="out"
+
+tmp_file="${tmp_dir}/tmp"
+
+__get_value() {
+	# 1: filename
+	# 2: Attribute name
+	# Retrieve and return the key/value of a lowdown source file.
+	lowdown -T ms -X "${2}" "${1}" 2>/dev/null
+}
+
+__get_value_title() {
+	# 1: filename
+	# Get the title of a file and return a safe string.
+	local _title
+
+	_title="$(__get_value ${1} title || true)"
+	if [ "${_title}" = "" ]; then
+		_title="$(basename ${1} |
+			rev |
+			cut -d "." -f 2 |
+			rev |
+			sed 's/-/ /g')"
+	fi
+
+	echo "${_title}"
+}
+
+__get_value_date() {
+	# 1: filename
+	# Get the date of a file and return a safe string.
+	local _date
+
+	_date="$(__get_value ${1} date || true)"
+	if [ "${_date}" = "" ]; then
+		_date="1970-01-01"
+	fi
+
+	echo "${_date}"
+}
+
+__get_value_date_human() {
+	# 1: filename
+	# Get a human readable date from a file and return a safe string.
+	__get_value_date "${1}" | xargs date -j -f "%Y-%m-%d" +"%B %d, %Y"
+}
+
+__get_out_filename() {
+	# 1: filename
+	# Convert the source filename to its output destination.
+	local _filename
+
+	_filename="${1}"
+
+	if $(__get_value "${1}" draft || false); then
+		_filename="$(dirname ${1})/$(basename ${1} | sha256).html"
+	fi
+	
+	echo "${_filename}" |
+		sed 's/.md$/.html/g' |
+		sed "s/${src_dir}/${out_dir}/g"
+}
+
+__get_final_filename() {
+	# 1: filename
+	# Convert the source filename to its final filename for a webserver.
+	__get_out_filename "${1}" | cut -d "/" -f 2-
+}
+
+__list_files() {
+	# 1: directory
+	# List all regular files in a directory and its subdirectories.
+	find "${1}" -type f
+}
+
+__list_files_date() {
+	# 1: directory
+	local _files
+	local _file
+	local _tmp_file
+	
+	_files=$(__list_files "${1}")
+	_tmp_file="${tmp_file}.list_files_date"
+
+	cp /dev/null "${_tmp_file}"
+
+	for _file in ${_files}; do
+		echo "$(__get_value_date ${_file})" "${_file}" >> "${_tmp_file}"
+	done
+
+	sort -r "${_tmp_file}" | cut -d " " -f 2-
+}
+
+__install() {
+	# 1: filename
+	# Copy a file to the output directory.
+	install -D -m 0644 "${1}" "${2}"
+}
+
+__lowdown() {
+	# Output a file to html
+	lowdown --html-no-skiphtml --html-no-escapehtml "${1}"
+}
+
+__apply_template() {
+	# 1: template name or default
+	m4 "templates/${1:-default}"
+}
+
+__generate_index_line() {
+	# 1: filename where index will be displayed
+	# 2: filename contained in line
+	local _show_date
+
+	_show_date="$(__get_value ${1} index_date || echo false)"
+
+	if "${_show_date}"; then
+		cat <<-EOF
+		<span>
+		$(__get_value_date_human ${2})
+		</span>
+		EOF
+	fi
+
+	cat <<-EOF
+	<a href="$(__get_final_filename ${2})">
+	$(__get_value_title ${2})
+	</a>
+	EOF
+}
+
+__generate_index() {
+	# 1: filename
+	# Generate and output to stdout the index of a file.
+	local _file
+	local _index_dir
+
+	_index_dir="${src_dir}/$(__get_value "${1}" index)"
+	[ -f "${_index_dir}" ] && _index_dir=$(dirname "${_index_dir}")
+	[ ! -d "${_index_dir}" ] && return
+
+	echo "<ul class=\"index\">"
+
+	for _file in $(__list_files_date "${_index_dir}"); do
+		[ "${1}" = "${_file}" ] && continue
+		__get_value "${_file}" "draft" >/dev/null && continue
+
+		echo "<li>"
+		__generate_index_line "${1}" "${_file}"
+		echo "</li>"
+	done
+
+	echo "</ul>"
+}
+
+__handle_md() {
+	# 1: filename
+	# Handle markdown files.
+	__lowdown "${1}" > "${tmp_file}.body"
+
+	if [ ! "$(__get_value ${1} index)" = "" ]; then
+		__generate_index "${1}" > "${tmp_file}.index"
+	else
+		[ -f "${tmp_file}.index" ] && rm "${tmp_file}.index"
+	fi
+
+	__apply_template "$(__get_value ${1} template)" > "${tmp_file}"
+	__install "${tmp_file}" "$(__get_out_filename ${1})"
+}
+
+__handle() {
+	# 1: filename
+	# Handle file depending on its filename and filetype.
+	case "${1}" in
+		*.md)
+			__handle_md "${1}"
+			;;
+		*)
+			__install "${1}" "$(__get_out_filename ${1})"
+			;;
+	esac
+}
diff --git a/bin/ssg b/bin/ssg
index 28eeea0..d3f2e02 100755
--- a/bin/ssg
+++ b/bin/ssg
@@ -1,117 +1,24 @@
 #!/bin/sh
 
-TEMPLATE="templates/default.html"
-STATIC_DIRS="style img"
-TMP_FILE=".tmp"
-SRC="src"
-OUT="out"
-#BASE_URL=""
+. $(dirname "${0}")/func
 
-. ./bin/ssg-template
+set -xe
 
-_log() {
-	echo [${0}] "$@"
-}
+# Check if the working directory is valid.
+echo "${0}" | grep '^./bin/ssg$'
 
-_to_html() {
-	# 1: filename
-	# stdout: content
-	lowdown --html-no-skiphtml --html-no-escapehtml "${1}"
-}
+src_files="$(__list_files ${src_dir})"
+dirs="${media_dir} \
+	${src_dir} \
+	${tmp_dir} \
+	${out_dir}"
 
-_install() {
-	# 1: filename
-	install -D "${TMP_FILE}" $(_get_out_path "${1}")
-}
+# Ensure directories exist.
+for dir in ${dirs}; do
+	[ ! -d "${dir}" ] && mkdir "${dir}"
+done
 
-_template_heredoc() {
-	echo ". ${PWD}/bin/ssg-template" > "tmp/heredoc"
-	echo "cat <<EOF_TEMPLATE" >> "tmp/heredoc"
-	cat "${1}" >> "tmp/heredoc"
-	echo EOF_TEMPLATE >> "tmp/heredoc"
-
-	sh "tmp/heredoc" "${1}" > "${TMP_FILE}"
-	_to_html "${TMP_FILE}" > "${2}"
-}
-
-_convert_urls() {
-	# file url
-	if ! echo "${2}" | grep "^http" >/dev/null; then
-		sed -i "s@href=/@href=$2/@g" "${1}"
-	fi
-	sed -i "s@<a[^>]* href=\"[/^\"]*/@<a href=\"$2/@g" "${1}"
-	sed -i "s@<link[^>]* href=\"[/^\"]*/@<link href=\"$2/@g" "${1}"
-	sed -i "s@<img[^>]* src=\"[/^\"]*/@<img src=\"$2/@g" "${1}"
-}
-
-main() {
-	local file
-	local out_path
-
-	# template files
-	for template in header footer; do
-		_log "> ${template}"
-		_to_html "templates/${template}.md" > "${TMP_FILE}"
-		install -D "${TMP_FILE}" "tmp/${template}.html"
-	done
-
-	# markdown files
-	for file in $(find "${SRC}" -iname "*.md"); do
-		out_path=$(_get_out_path "${file}")
-
-		if [ "${file}" -ot "${out_path}" ]; then
-			_log "! ${file}"
-			continue
-		fi
-
-		_log "> ${file}"
-
-		# Metadata
-		_cleanup_tmp_file "tmp/metadata.html"
-		_render_metadata "${file}" > "tmp/metadata.html"
-
-		# Table of content
-		_cleanup_tmp_file "tmp/toc.html"
-		if [ $(_get_value "${file}" "toc") ]; then
-			_render_toc "${file}" > "tmp/toc.html"
-		fi
-
-		# Index of directory
-		_cleanup_tmp_file "tmp/index.html"
-		if [ $(_get_value "${file}" "index") ]; then
-			_render_index "${file}" > "tmp/index.html"
-		fi
-
-		# Render body content
-		_to_html "${file}" > "tmp/body.html"
-
-		# Erase body content with templating
-		if basename "${file}" | grep "^_"; then
-			_template_heredoc "${file}" "tmp/body.html"
-		fi
-
-		# Concatenate temporary files to final page
-		template=$(_get_value "${file}" "template")
-		template="${template:-default}"
-		m4 "templates/${template}.html" > "${TMP_FILE}"
-		install -D "${TMP_FILE}" "${out_path}"
-	done
-
-	# html files
-	for file in $(find "${SRC}" -iname "*.html"); do
-		_log "> ${file}"
-		_install "${file}"
-	done
-
-	# convert urls
-	for file in $(find "${OUT}" -iname "*.html"); do
-		_convert_urls "${file}" "${BASE_URL}"
-	done
-
-	for dir in ${STATIC_DIRS}; do
-		_log "> ${dir}/"
-		cp -R "src/${dir}" "out/${dir}"
-	done
-}
-
-main
+# Generate output files from sources.
+for src_file in ${src_files}; do
+	__handle "${src_file}"
+done
diff --git a/bin/ssg-template b/bin/ssg-template
deleted file mode 100644
index eacf2ae..0000000
--- a/bin/ssg-template
+++ /dev/null
@@ -1,194 +0,0 @@
-#!/bin/sh
-
-SRC_FILE="${1}"
-
-_echo_ifset() {
-	[ ! -z "${1}" ] && echo "${1}"
-}
-
-_get_value() {
-	# 1: filename
-	# 2: key
-	# stdout: value
-	local value
-	local ret
-
-	value=$(lowdown -T ms -X "${2}" "${1}" 2>/dev/null)
-	ret="${?}"
-
-	echo "${value:-${3}}"
-
-	return "${ret}"
-}
-
-_get_value_date() {
-	_get_value "${1}" "${2}" "1970-01-01"
-}
-
-_get_out_path() {
-	# 1: filename
-	# stdout: filename
-	local path
-
-	path=$(echo "${1}" | sed -e 's/^src/out/g' -e 's/.md$/.html/g' -e 's/_//g')
-
-	if _get_value "${1}" "draft" >/dev/null; then
-		path="$(dirname ${path})/$(echo ${path} | sha1).html"
-	fi
-
-	echo "${path}"
-}
-
-_get_final_path() {
-	# 1: filename
-	# stdout: filename
-	_get_out_path "${1}" | sed 's/^out\///g'
-}
-
-_get_title() {
-	# 1: filename
-	local title
-	local file_title
-
-	file_title=$(basename "${1}" | sed 's/\..*//g' | tr - " ")
-	title=$(_get_value "${1}" "title" "${file_title}")
-
-	echo "${title}"
-}
-
-_get_date_human() {
-	# 1: filename
-	date -j -f "%Y-%m-%d" $(_get_value_date ${1} "date") +"%B %d, %Y"
-}
-
-_get_index_files() {
-	# 1: filename
-	local path
-
-	path=$(_get_value "${1}" index)
-	find "src/${path}" -mindepth 1 -maxdepth 1
-}
-
-_sort_index_per_date() {
-	# 1: filename
-	local files
-	local file
-	local date
-
-	for file in $(_get_index_files "${1}"); do
-		date=$(_get_value_date "${file}" "date")
-		files="${files} ${date}@${file}"
-	done
-
-	echo ${files} | tr " " "\n" | sort -rn | cut -d "@" -f 2
-}
-
-_get_filetype() {
-	# 1: filename
-	local filetype
-
-	filetype=$(ls -ld "${1}" | cut -c 1)
-
-	case "${filetype}" in
-		-)
-			filetype="file"
-			;;
-		d)
-			filetype="directory"
-			;;
-	esac
-
-	echo "${filetype}"
-}
-
-_get_chapters() {
-	# 1: filename
-	grep "^#" "${1}" | sed 's/# /#_/g'
-}
-
-_get_chapter_title() {
-	# 1: chapter
-	echo "${1}" | sed -e 's/#_//' -e 's/#//g'
-}
-
-_parse_option() {
-	# 1: metadata
-	# 2: key
-	echo "${metadata}" | grep "^${2}"
-}
-
-_cleanup_tmp_file() {
-	[ -f "${1}" ] && rm "${1}"
-}
-
-_parse_metadata() {
-	# 1: filename
-	sed -n '/^$/q;p' "${file}" | grep "^.*: .*$"
-}
-
-_render_metadata() {
-	# 1: filename
-	# 2: output
-	local key
-	local value
-	local title
-
-	# _ENABLED_METADATA="date author"
-	title=$(_get_value "${1}" "title")
-
-	echo "<ul class=\"metadata\">"
-	for key in ${_ENABLED_METADATA}; do
-		value=$(lowdown -X "${key}" "${1}" 2>/dev/null)
-		[ -z "${value}" ] && continue
-
-		echo "<li>${key}: ${value}</li>"
-	done
-	echo "</ul>"
-
-	if [ "${title}" ]; then
-		echo "<h1>${title}</h1>"
-	fi
-}
-
-_render_index() {
-	# 1: filename
-	# 2: out
-	# 3: path
-	local file
-	local path
-	local title
-
-	echo "<ul class=\"index\">"
-	for file in $(_sort_index_per_date "${1}"); do
-		path=$(_get_final_path "${file}")
-		[ "${path}" = "$(_get_final_path ${1})" ] && continue
-		_get_value "${file}" "draft" >/dev/null && continue
-
-		title=$(_get_value "${file}" "title" "$(_get_title ${file})")
-
-		echo "<li>"
-		if _get_value "${1}" "index_show_date" >/dev/null; then
-			echo "<span>$(_get_date_human ${file})</span>"
-		fi
-		echo "<a href=\"${path}\">${title}</a>"
-		echo "</li>"
-	done
-	echo "</ul>"
-}
-
-_render_toc() {
-	local chapter
-	local chapter_title
-
-	echo "<ul class=\"toc\">"
-	for chapter in $(_get_chapters "${1}"); do
-		chapter_title=$(_get_chapter_title "${chapter}")
-
-		cat <<-EOF
-		<li>
-		<a href=#${chapter_title}>${chapter_title}</a>
-		</li>
-		EOF
-	done
-	echo "</ul>"
-}