add update checks

fallback.go

@@ -3,11 +3,30 @@ package main
 import (
 	"fmt"
 	"strconv"
+
+	"github.com/skratchdot/open-golang/open"
 )
 
 func createFallbackUI() {
 	fmt.Println(header)
 
+	shouldUpdate, newTag, err := checkForUpdate()
+	if err != nil {
+		fmt.Println(err.Error())
+		fmt.Scanln()
+		panic(err)
+	}
+
+	if shouldUpdate {
+		var choice string
+		fmt.Printf("There is a new shadowfox-updater version available (%s -> %s)\nDo you want to update? [y/n]", tag, newTag)
+		fmt.Scanln(&choice)
+		wantToUpdate := (choice == "y" || choice == "Y")
+		if wantToUpdate {
+			open.Start("https://github.com/SrKomodo/shadowfox-updater/#installing")
+		}
+	}
+
 	var choice string
 	paths, names, err := getProfilePaths()
 	if err != nil {

go.mod

@@ -6,4 +6,5 @@ require (
 	github.com/gen2brain/dlgs v0.0.0-20180629122906-342edb4c68c1
 	github.com/go-ini/ini v1.42.0
 	github.com/mitchellh/go-homedir v1.1.0
+	github.com/skratchdot/open-golang v0.0.0-20190402232053-79abb63cd66e
 )

go.sum

@@ -4,3 +4,5 @@ github.com/go-ini/ini v1.42.0 h1:TWr1wGj35+UiWHlBA8er89seFXxzwFn11spilrrj+38=
 github.com/go-ini/ini v1.42.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
 github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
+github.com/skratchdot/open-golang v0.0.0-20190402232053-79abb63cd66e h1:VAzdS5Nw68fbf5RZ8RDVlUvPXNU6Z3jtPCK/qvm4FoQ=
+github.com/skratchdot/open-golang v0.0.0-20190402232053-79abb63cd66e/go.mod h1:sUM3LWHvSMaG192sy56D9F7CNvL7jUJVXoqM1QKLnog=

main.go

@@ -4,7 +4,6 @@ import (
 	"os"
 )
 
-var tag string
 var header = "Shadowfox updater " + tag
 
 func main() {

ui.go

@@ -1,10 +1,32 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/gen2brain/dlgs"
+	"github.com/skratchdot/open-golang/open"
 )
 
 func createUI() error {
+	shouldUpdate, newTag, err := checkForUpdate()
+	if err != nil {
+		_, err := dlgs.Error(header, err.Error())
+		if err != nil {
+			return err
+		}
+	}
+
+	if shouldUpdate {
+		wantToUpdate, err := dlgs.Question(header, fmt.Sprintf("There is a new shadowfox-updater version available (%s -> %s)\nDo you want to update?", tag, newTag), true)
+		if err != nil {
+			return err
+		}
+		if wantToUpdate {
+			open.Start("https://github.com/SrKomodo/shadowfox-updater/#installing")
+			return nil
+		}
+	}
+
 	paths, names, err := getProfilePaths()
 	if err != nil {
 		_, err := dlgs.Error(header, err.Error())

version.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"io/ioutil"
+	"net/http"
+	"regexp"
+)
+
+var tag string
+
+func checkForUpdate() (bool, string, error) {
+	resp, err := http.Get("https://api.github.com/repos/SrKomodo/shadowfox-updater/releases/latest")
+	if err != nil {
+		return false, "", err
+	}
+
+	defer resp.Body.Close()
+	data, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return false, "", err
+	}
+
+	regex := regexp.MustCompile(`"tag_name":"(.+?)"`)
+	newTag := string(regex.FindSubmatch(data)[1])
+
+	return newTag != tag, newTag, nil
+}