From c79b18d5a7d3b47ea5db495b4d6a6faf0b7dbb11 Mon Sep 17 00:00:00 2001
From: Mitch Riedstra <mitch@riedstra.us>
Date: Sun, 22 Dec 2019 09:46:17 -0500
Subject: Add support for a 404 page

---
 page/http.go | 20 +++++++++++++++++---
 page/page.go |  6 ++++--
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/page/http.go b/page/http.go
index acf9147..98546f6 100644
--- a/page/http.go
+++ b/page/http.go
@@ -4,6 +4,7 @@ import (
 	"log"
 	"net/http"
 	"path/filepath"
+	"strings"
 )
 
 func SetupHandlers() {
@@ -22,9 +23,22 @@ func PageHandler(w http.ResponseWriter, r *http.Request) {
 	p := &Page{Name: u}
 	err := p.Render(w)
 	if err != nil {
-		log.Println(err)
-		http.Error(w, "Internal server error", 500)
-		return
+		if strings.HasSuffix(err.Error(), "no such file or directory") {
+			log.Printf("Page '%s' not found, trying 404", p.Name)
+			p.Name = "404"
+			w.WriteHeader(404)
+			err := p.Render(w)
+			if err != nil {
+				log.Println(err)
+				http.Error(w, "Internal server error", 500)
+				return
+			}
+			return
+		} else {
+			log.Println(err)
+			http.Error(w, "Internal server error", 500)
+			return
+		}
 	}
 
 }
diff --git a/page/page.go b/page/page.go
index 83e3c9e..f5a296c 100644
--- a/page/page.go
+++ b/page/page.go
@@ -60,9 +60,11 @@ func (p *Page) readYaml() error {
 }
 
 func (p *Page) readMarkdown() error {
-	b, err := ioutil.ReadFile(p.Name + ".md")
+	pth := p.Name + ".md"
+	b, err := ioutil.ReadFile(pth)
 	if err != nil {
-		return err
+		return fmt.Errorf("Error while reading markdown for path %s: %v",
+			pth, err)
 	}
 	p.Body = string(blackfriday.Run(b))
 	return nil
-- 
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