Switch to pointers, add modify function

funcs.go

@@ -3,15 +3,16 @@ package main
 import (
 	"io/ioutil"
 	"log"
+	"os"
 	"strings"
 )
 
 // List parses the list of members, appends the data to a slice of type list,
 // then returns the slice
-func parseList() []ring {
+func parseList() *[]ring {
 	file, err := ioutil.ReadFile(*flagMembers)
 	if err != nil {
-		log.Fatal("Error while loading list of webring members:", err)
+		log.Fatal("Error while loading list of webring members: ", err)
 	}
 	lines := strings.Split(string(file), "\n")
 	var r []ring
@@ -19,10 +20,40 @@ func parseList() []ring {
 		fields := strings.Fields(line)
 		r = append(r, ring{handle: fields[0], url: fields[1]})
 	}
-	return r
+	return &r
 }
 
 // Link returns an HTML, HTTPS link of a given URI
 func link(l string) string {
 	return "<a href='https://" + l + "'>" + l + "</a>"
 }
+
+// Modify returns true if the index and ring list have been modified since last
+// read
+func modify() bool {
+	members, err := os.Stat(*flagMembers)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	index, err := os.Stat(*flagIndex)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	curRTime := members.ModTime().Unix()
+	curITime := index.ModTime().Unix()
+
+	if *rModTime == 0 {
+		*rModTime = curRTime
+	} else if *rModTime < curRTime {
+		return true
+	}
+
+	if *indexModTime == 0 {
+		*indexModTime = curITime
+	} else if *indexModTime < curITime {
+		return true
+	}
+
+	return false
+}