From 844b35589e31deec76cd997567e43a4262d28c80 Mon Sep 17 00:00:00 2001
From: Alexandre Aubin <alexandre.aubin@cern.ch>
Date: Thu, 10 May 2018 01:14:53 +0200
Subject: [PATCH] Add ynh_render_template helper to render templates with
 jinja2

---
 data/helpers.d/utils | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/data/helpers.d/utils b/data/helpers.d/utils
index cc057eb0b..05f9a4703 100644
--- a/data/helpers.d/utils
+++ b/data/helpers.d/utils
@@ -234,3 +234,20 @@ ynh_local_curl () {
 	# Curl the URL
 	curl --silent --show-error -kL -H "Host: $domain" --resolve $domain:443:127.0.0.1 $POST_data "$full_page_url"
 }
+
+# Render templates with Jinja2
+# 
+# Attention : Variables should be exported before calling this helper to be
+# accessible inside templates.
+#
+# usage: ynh_render_template some_template output_path
+# | arg: some_template - Template file to be rendered
+# | arg: output_path   - The path where the output will be redirected to
+ynh_render_template() {
+   local template_path=$1
+   local output_path=$2
+   # Taken from https://stackoverflow.com/a/35009576
+   python2.7 -c 'import os, sys, jinja2; sys.stdout.write(
+                    jinja2.Template(sys.stdin.read()
+                 ).render(os.environ));' < $template_path > $output_path
+}