1 files changed, 103 insertions, 0 deletions
diff --git a/v2/src/bin/extract b/v2/src/bin/extract
new file mode 100755
index 0000000..ce4b115
--- /dev/null
+++ b/v2/src/bin/extract
@@ -0,0 +1,103 @@
+#!/bin/sh
+set -eu
+
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  extract -t TYPE < STDIN
+		  extract -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+		Options:
+		  -t TYPE       the type of extraction to perform ("content" or "env")
+		  -h, --help    show this message
+
+
+		Separate the content from the "frontmatter", and emit the
+		selected one.
+
+
+		Examples:
+
+		  Get the content:
+
+		    $ extract -t content < src/file.md > src/file.entry-content
+
+
+		  Get the "frontmatter":
+
+		    $ extract -t env < src/f.md > src/f.entry-env
+	EOF
+}
+
+
+for flag in "$@"; do
+	case "$flag" in
+		--)
+			break
+			;;
+		--help)
+			usage
+			help
+			exit
+			;;
+		*)
+			;;
+	esac
+done
+
+TYPE=''
+while getopts 't:h' flag; do
+	case "$flag" in
+		t)
+			TYPE="$OPTARG"
+			;;
+		h)
+			usage
+			help
+			exit
+			;;
+		*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+
+eval "$(assert-arg "$TYPE" '-t TYPE')"
+
+
+case "$TYPE" in
+	content)
+		awk '
+			separator >= 2
+			/^---$/ { separator++ }
+		'
+		;;
+	env)
+		awk '
+			/^---$/ {
+				if (++separator > 1) {
+					exit
+				} else {
+					next
+				}
+			}
+
+			{ print }
+		'
+		;;
+	*)
+		printf 'Bad value for TYPE: "%s".\n\n' \
+			"$TYPE" >&2
+		usage >&2
+		exit 2
+		;;
+esac