From 3f3ffb4becf159613babbc2f2b6e49db153d0d48 Mon Sep 17 00:00:00 2001
From: Jan-Lukas Else <mail@jlelse.de>
Date: Sun, 20 Sep 2020 19:10:01 +0200
Subject: [PATCH] Add methods to use configurable strings in templates
 (preparation for multiblog/multilang)

---
 main.go                        |  7 ++++++-
 render.go                      |  3 ++-
 templateStrings.go             | 38 ++++++++++++++++++++++++++++++++++
 templates/post.gohtml          |  6 ++++--
 templates/strings/default.yaml |  2 ++
 5 files changed, 52 insertions(+), 4 deletions(-)
 create mode 100644 templateStrings.go
 create mode 100644 templates/strings/default.yaml

diff --git a/main.go b/main.go
index 0de8011..51e3599 100644
--- a/main.go
+++ b/main.go
@@ -24,12 +24,17 @@ func main() {
 	}
 	log.Println("Initialize server components...")
 	initMinify()
+	initMarkdown()
 	err = initTemplateAssets() // Needs minify
 	if err != nil {
 		log.Fatal(err)
 		return
 	}
-	initMarkdown()
+	err = initTemplateStrings()
+	if err != nil {
+		log.Fatal(err)
+		return
+	}
 	err = initRendering() // Needs assets
 	if err != nil {
 		log.Fatal(err)
diff --git a/render.go b/render.go
index 7338906..e6b5d53 100644
--- a/render.go
+++ b/render.go
@@ -63,7 +63,8 @@ func initRendering() error {
 			}
 			return d.Format(format)
 		},
-		"asset": assetFile,
+		"asset":  assetFile,
+		"string": getDefaultTemplateString,
 		"include": func(templateName string, data interface{}) (template.HTML, error) {
 			buf := new(bytes.Buffer)
 			err := templates[templateName].ExecuteTemplate(buf, templateName, data)
diff --git a/templateStrings.go b/templateStrings.go
new file mode 100644
index 0000000..d075f0c
--- /dev/null
+++ b/templateStrings.go
@@ -0,0 +1,38 @@
+package main
+
+import (
+	"gopkg.in/yaml.v3"
+	"io/ioutil"
+	"path"
+)
+
+const stringsDir = "templates/strings"
+const defaultVariant = "default"
+const variantFileExt = ".yaml"
+
+var templateStrings map[string]map[string]string
+
+func initTemplateStrings() error {
+	templateStrings = map[string]map[string]string{}
+	for _, variant := range []string{defaultVariant} {
+		variantStrings := map[string]string{}
+		fileContent, err := ioutil.ReadFile(path.Join(stringsDir, variant+variantFileExt))
+		if err != nil {
+			return err
+		}
+		err = yaml.Unmarshal(fileContent, variantStrings)
+		if err != nil {
+			return err
+		}
+		templateStrings[variant] = variantStrings
+	}
+	return nil
+}
+
+func getDefaultTemplateString(name string) string {
+	return getTemplateStringVariant(name, defaultVariant)
+}
+
+func getTemplateStringVariant(name, variant string) string {
+	return templateStrings[variant][name]
+}
diff --git a/templates/post.gohtml b/templates/post.gohtml
index 1d3dbf6..d43834c 100644
--- a/templates/post.gohtml
+++ b/templates/post.gohtml
@@ -6,8 +6,10 @@
   <main class=h-entry>
     <article>
         {{ with title . }}<h1 class=p-name>{{ . }}</h1>{{ end }}
-        {{ with .Published }}<p>Published on {{ dateformat . "02. Jan 2006" }}</p>{{ end }}
-        {{ with .Updated }}<p>Updated on {{ dateformat . "02. Jan 2006" }}</p>{{ end }}
+        {{ with .Published }}
+        <p>{{ string "publishedon" }} {{ dateformat . "02. Jan 2006" }}</p>{{ end }}
+        {{ with .Updated }}
+        <p>{{ string "updatedon" }} {{ dateformat . "02. Jan 2006" }}</p>{{ end }}
         {{ with .Content }}
           <div class=e-content>{{ md . }}</div>
         {{ end }}
diff --git a/templates/strings/default.yaml b/templates/strings/default.yaml
new file mode 100644
index 0000000..0e513b0
--- /dev/null
+++ b/templates/strings/default.yaml
@@ -0,0 +1,2 @@
+publishedon: "Published on"
+updatedon: "Updated on"
\ No newline at end of file