From ead5522c6805798e001cee52b670c60edd101534 Mon Sep 17 00:00:00 2001
From: Jake Walker <hi@jakew.me>
Date: Sat, 5 Feb 2022 12:08:02 +0000
Subject: [PATCH] add update check

---
 README.md        |  2 +-
 go.mod           |  1 +
 go.sum           |  2 ++
 main.go          |  8 ++++++++
 update/update.go | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
 version.go       |  5 +++++
 6 files changed, 67 insertions(+), 1 deletion(-)
 create mode 100644 update/update.go
 create mode 100644 version.go

diff --git a/README.md b/README.md
index 756e44d..c305ced 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ and [Lip Gloss](https://github.com/charmbracelet/lipgloss).
 - [x] Statistics are saved to `~/.wordle.json` for use in other programs
 - [x] Same word list as the official website
 - [ ] Leaderboard of people on current tilde
-- [ ] Update checking
+- [x] Update checking
 - [ ] Export to sharable message/emojis
 - [ ] Share to Mastodon
 - [ ] Play previous days
diff --git a/go.mod b/go.mod
index d9eae25..c785880 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module tildegit.org/jakew/wordle
 go 1.17
 
 require (
+	github.com/Masterminds/semver/v3 v3.1.1
 	github.com/charmbracelet/bubbletea v0.19.3
 	github.com/charmbracelet/lipgloss v0.4.0
 )
diff --git a/go.sum b/go.sum
index 0fcfae2..3f49bf8 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
+github.com/Masterminds/semver/v3 v3.1.1 h1:hLg3sBzpNErnxhQtUy/mmLR2I9foDujNK030IGemrRc=
+github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
 github.com/charmbracelet/bubbletea v0.19.3 h1:OKeO/Y13rQQqt4snX+lePB0QrnW80UdrMNolnCcmoAw=
 github.com/charmbracelet/bubbletea v0.19.3/go.mod h1:VuXF2pToRxDUHcBUcPmCRUHRvFATM4Ckb/ql1rBl3KA=
 github.com/charmbracelet/lipgloss v0.4.0 h1:768h64EFkGUr8V5yAKV7/Ta0NiVceiPaV+PphaW1K9g=
diff --git a/main.go b/main.go
index 798eb3f..a5e0946 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bufio"
 	"fmt"
 	tea "github.com/charmbracelet/bubbletea"
 	"os"
@@ -8,6 +9,7 @@ import (
 	"tildegit.org/jakew/wordle/game/score"
 	"tildegit.org/jakew/wordle/game/util"
 	"tildegit.org/jakew/wordle/game/words"
+	"tildegit.org/jakew/wordle/update"
 	"unicode"
 )
 
@@ -165,6 +167,12 @@ func (m model) View() string {
 }
 
 func main() {
+	updateMsg := update.CheckVersion(update.GetGiteaRelease("tildegit.org", "jakew", "wordle"), BuildVersion)
+	if updateMsg != "" {
+		fmt.Println(fmt.Sprintf("%v. Press enter to continue...", updateMsg))
+		bufio.NewReader(os.Stdin).ReadBytes('\n')
+	}
+
 	p := tea.NewProgram(initialModel())
 	if err := p.Start(); err != nil {
 		fmt.Printf("Something has gone wrong: %v", err)
diff --git a/update/update.go b/update/update.go
new file mode 100644
index 0000000..66dc70a
--- /dev/null
+++ b/update/update.go
@@ -0,0 +1,50 @@
+package update
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/Masterminds/semver/v3"
+	"io"
+	"net/http"
+)
+
+func GetGiteaRelease(instance string, owner string, repo string) *semver.Version {
+	res, err := http.Get(fmt.Sprintf("https://%v/api/v1/repos/%v/%v/releases", instance, owner, repo))
+	if err != nil {
+		return nil
+	}
+	defer res.Body.Close()
+	body, err := io.ReadAll(res.Body)
+
+	var data []struct {
+		TagName string `json:"tag_name"`
+	}
+	err = json.Unmarshal(body, &data)
+	if err != nil || len(data) < 1 {
+		return nil
+	}
+
+	v, err := semver.NewVersion(data[0].TagName)
+	if err != nil {
+		return nil
+	}
+
+	return v
+}
+
+func CheckVersion(latest *semver.Version, current string) string {
+	if latest == nil {
+		return ""
+	}
+
+	current1, err := semver.NewVersion(current)
+	if err != nil {
+		return ""
+	}
+
+	if latest.GreaterThan(current1) {
+		return fmt.Sprintf("A new version, %s, is available for download", latest)
+	} else {
+		return ""
+	}
+}
diff --git a/version.go b/version.go
new file mode 100644
index 0000000..b4ce86b
--- /dev/null
+++ b/version.go
@@ -0,0 +1,5 @@
+package main
+
+var (
+	BuildVersion string = "?"
+)