v2: Support Atom feeds and collection translations

1 files changed, 219 insertions, 0 deletions

diff --git a/v2/src/bin/html b/v2/src/bin/html
new file mode 100755
index 0000000..7e6809c
--- /dev/null
+++ b/v2/src/bin/html
@@ -0,0 +1,219 @@
+#!/bin/sh
+set -eu
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  html FILENAME
+		  html -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+
+		Options:
+		  -h, --help    show this message
+
+		  FILENAME      the name of the input file .md file
+
+
+		Process the FILENAME, and generate a full HTML page.
+
+
+		Examples:
+
+		  Generate the HTML for a pastebin:
+
+		    $ html src/a-paste.md > src/a-paste.html
+	EOF
+}
+
+
+for f in "$@"; do
+	case "$f" in
+		--)
+			break
+			;;
+		--help)
+			usage
+			help
+			exit
+			;;
+		*)
+			;;
+	esac
+done
+
+while getopts 'h' flag; do
+	case "$flag" in
+		h)
+			usage
+			help
+			exit
+			;;
+		*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+. src/lib.sh
+
+FILENAME="${1:-}"
+eval "$(assert_arg "$FILENAME" 'FILENAME')"
+
+
+# shellcheck source=/dev/null
+. "${FILENAME%.md}.conf"
+
+#
+# Utility functions
+#
+
+SEEN_SLUGS="$(mkstemp)"
+slugify_once() {
+	SLUG="$(printf '%s' "$1" | slugify)${2:+-$2}"
+	if grep -q "^$SLUG$" "$SEEN_SLUGS"; then
+		N="${2:-0}"
+		N=$((N + 1))
+		slugify_once "$1" "$N"
+	else
+		printf '%s\n' "$SLUG" >> "$SEEN_SLUGS"
+		printf '%s' "$SLUG"
+	fi
+}
+
+INDENT='        '
+markdown_to_html() {
+	md2html | awk -vINDENT="$INDENT" '
+		BEGIN {
+			in_block = 0
+		}
+
+		{
+			if (in_block == 0) {
+				printf "%s", INDENT
+			}
+			print
+		}
+
+		/^<\/code><\/pre>$/ {
+			in_block = 0
+		}
+
+		/^<pre><code/ {
+			in_block = 1
+		}
+	'
+}
+
+extract_plaintext_snippets() {
+	SNIPPETS="${FILENAME%.md}.snippets"
+	printf '' > "$SNIPPETS"
+	F="$(mkstemp)"
+	cat > "$F"
+	(
+		IFS=''
+		BLOCK_NUMBER=0
+		IN_BLOCK=
+		while read -r line; do
+			if [ "$line" = '</code></pre>' ]; then
+				IN_BLOCK=
+			fi
+
+			if [ -n "$IN_BLOCK" ]; then
+				printf '%s\n' "$line" | htmlesc -d >> "$OUT"
+			fi
+
+			if printf '%s' "$line" | grep -q "^$INDENT<pre><code"; then
+				IN_BLOCK=1
+				OUT="${FILENAME%.md}.html.$BLOCK_NUMBER.txt"
+				BLOCK_NUMBER=$((BLOCK_NUMBER + 1))
+				printf '%s\n' "$line" |
+					sed "s|^\($INDENT<pre><code.*>\)\(.*\)$|\2|" |
+					htmlesc -d > "$OUT"
+				printf '%s\n' "$OUT" >> "$SNIPPETS"
+			fi
+		done < "$F"
+
+		BLOCK_NUMBER=0
+		while read -r line; do
+			printf '%s\n' "$line"
+
+			if [ "$line" = '</code></pre>' ]; then
+				printf '%s<p class="plaintext-link"><a href="%s">plaintext</a></p>\n' \
+					"$INDENT" \
+					"$(basename "${url_part:?}").$BLOCK_NUMBER.txt"
+				BLOCK_NUMBER=$((BLOCK_NUMBER + 1))
+			fi
+		done < "$F"
+	)
+
+}
+
+add_line_numbers() {
+	awk '
+		/^<\/code><\/pre>$/ {
+			in_block = 0
+			printf "</tbody></table>%s\n", $0
+			next
+		}
+
+		match($0, /^( +<pre><code.*>)(.*)$/, a) {
+			printf "%s<table rules=columns class=\"code-block\"><tbody>", a[1]
+
+			n = 1
+			block_count++
+			printf "<tr><td class=\"line-number\"><a id=\"B%s-L%s\" href=\"#B%s-L%s\">%s</a></td><td class=\"code-line\">%s</td></tr>\n", block_count, n, block_count, n, n, a[2]
+			in_block = 1
+			next
+		}
+
+		in_block == 1 {
+			n++
+			printf "<tr><td class=\"line-number\"><a id=\"B%s-L%s\" href=\"#B%s-L%s\">%s</a></td><td class=\"code-line\">%s</td></tr>\n", block_count, n, block_count, n, n, $0
+			next
+		}
+
+		{ print }
+	'
+}
+
+add_headings_anchors() {
+	(
+		IFS=''
+		while read -r line; do
+			if ! printf '%s' "$line" | grep -q "^$INDENT<h[2-6]>"; then
+				printf '%s\n' "$line"
+				continue
+			fi
+			LVL="$(printf '%s' "$line" | sed "s|^$INDENT<h\(.\)>.*|\1|")"
+			HEADING="$(printf '%s' "$line" | sed "s|^$INDENT<h.>\(.*\)</h.>$|\1|")"
+			SLUG="$(slugify_once "$HEADING")"
+			printf '%s<h%s class="header-anchor" id="%s">%s<a href="#%s" aria-hidden="true"><img class="svg-icon" src="%s" /></a></h%s>\n' \
+				"$INDENT"  \
+				"$LVL"     \
+				"$SLUG"    \
+				"$HEADING" \
+				"$SLUG"    \
+				"${icon_link_url:?}" \
+				"$LVL"
+		done
+	)
+}
+
+emit_body() {
+	< "${FILENAME%.md}.content" \
+		markdown_to_html           |
+		extract_plaintext_snippets |
+		add_line_numbers           |
+		add_headings_anchors
+}
+
+envsubst < src/lib/preamble.html
+emit_body | tee "${FILENAME%.md}.htmlbody"
+envsubst < src/lib/postamble.html