Adding script and instructions for creating zen sub themes. (Supported in Hugo 0.42.)

create_sub_theme.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+# shell script hardening
+set -euo pipefail
+
+# This script creates a new sub them from the zen base theme.
+# (Run chmod 700 on this file to make it executable)
+
+if [[ ! -d "zen" || "${PWD##*/}" != "themes" ]]; then
+  echo "Error: This script must be run from the theme folder."
+  echo "Usage: ./zen/create_sub_theme.sh"
+fi
+
+if [[ -z "${1-}" ]]; then
+  echo -n "Enter a human-readable subtheme name: "
+  read -e inputname
+else
+  inputname="$1"
+fi
+
+human=`echo $inputname | sed -e 's/"/\\"/g'`
+themename=`echo $inputname | tr [:upper:] [:lower:] | sed -e 's/[\-\ ]/_/g' -e 's/[^a-z0-9_]//g'`
+
+mkdir "$themename"
+
+cp -p zen/.eslintrc zen/.gitignore zen/.sass-lint.yml $themename/
+cp -p zen/gulpfile.js zen/package-lock.json zen/package.json zen/theme.toml $themename/
+cp -pr zen/sass $themename/
+cp -pr zen/static $themename/
+
+sed -e 's/^\(name = \).*$/\1"'"$human"'"/g' -e 's/^\(description = \).*$/\1"A Zen sub-theme"/g' $themename/theme.toml > $themename/theme.toml.temp
+mv -f $themename/theme.toml.temp $themename/theme.toml