template and data dirs

go-web-app/.gitignore

@@ -1,2 +1,3 @@
 gowiki/wiki
-gowiki/*.txt
+gowiki/gowiki
+*.txt

go-web-app/gowiki/TestPage.txt

@@ -1 +0,0 @@
-This is my fixed test page. Work!

go-web-app/gowiki/TestPage2.txt

@@ -1 +0,0 @@
-This is a test page for page two.

go-web-app/gowiki/common.go

@@ -0,0 +1,12 @@
+package main
+
+import "os"
+
+func GetDefaultEnv(key, default_value string) string {
+	// TODO figure out how to write unit test for this How would you wring
+	value := os.Getenv(key)
+	if value == "" {
+		value = default_value
+	}
+	return value
+}

go-web-app/gowiki/go.mod

@@ -0,0 +1,3 @@
+module gowiki
+
+go 1.21.0

go-web-app/gowiki/wiki.go

@@ -8,15 +8,28 @@ import (
 	"text/template"
 )
 
+var template_dir string = GetDefaultEnv("GOWIKI_TEMPLATE_DIR", "./tmpl")
+var data_dir string = GetDefaultEnv("GOWIKI_DATA_DIR", "./data")
+
 // Template caching
 // var templates = template.Must(template.ParseFiles("edit.html", "view.html"))
-var templates = template.Must(template.ParseGlob("./tmpl/*.html"))
+var templates = template.Must(template.ParseGlob(template_dir + "/*.html"))
 
 // var templates = template.Must(template.ParseFiles("edit.html", "view.html"))
 
 // Validation to prevent abitrary paths
 var validPath = regexp.MustCompile("^/(edit|save|view)/([a-zA-Z0-9]+)$")
 
+// // Retreives and environment variable or supplies the specified default
+// func GetDefaultEnv(key, default_value string) string {
+// 	// TODO figure out how to write unit test for this How would you wring
+// 	value := os.Getenv(key)
+// 	if value == "" {
+// 		value = default_value
+// 	}
+// 	return value
+// }
+
 // A wiki consists of a series of interconnected pages, each of which has a title and a body
 type Page struct {
 	Title string
@@ -26,7 +39,7 @@ type Page struct {
 
 // save Saves a page to disk.
 func (p *Page) save() error {
-	filename := p.Title + ".txt"
+	filename := data_dir + "/" + p.Title + ".txt"
 	return os.WriteFile(filename, p.Body, 0600)
 }
 
@@ -46,7 +59,7 @@ func (p *Page) save() error {
 // file, and returns a pointer to a Page struct containing the title and body.
 // If an error occurs during reading, it returns the error.
 func loadPage(title string) (*Page, error) {
-	filename := title + ".txt"
+	filename := data_dir + "/" + title + ".txt"
 	body, err := os.ReadFile(filename)
 
 	if err != nil {