From 7a40b002e4c3289fa76692bfa1ebfb08a936d76f Mon Sep 17 00:00:00 2001
From: Hariom Verma <hariom18599@gmail.com>
Date: Fri, 22 Sep 2023 06:18:28 +0530
Subject: [PATCH] Implement `gnopls version` cmd

---
 cmd/cmd.go                  |  1 +
 cmd/version.go              | 22 ++++++++++++++++++++
 go.mod                      |  2 ++
 go.sum                      |  4 ++++
 internal/version/version.go | 40 +++++++++++++++++++++++++++++++++++++
 5 files changed, 69 insertions(+)
 create mode 100644 cmd/version.go
 create mode 100644 internal/version/version.go

diff --git a/cmd/cmd.go b/cmd/cmd.go
index 7808570..eea33a2 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -20,6 +20,7 @@ func GnoplsCmd() *cobra.Command {
 	}
 
 	cmd.CompletionOptions.DisableDefaultCmd = true
+	cmd.AddCommand(CmdVersion())
 
 	return cmd
 }
diff --git a/cmd/version.go b/cmd/version.go
new file mode 100644
index 0000000..27cc2f8
--- /dev/null
+++ b/cmd/version.go
@@ -0,0 +1,22 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/harry-hov/gnopls/internal/version"
+	"github.com/spf13/cobra"
+)
+
+func CmdVersion() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "version",
+		Short: "print the gnopls version information",
+		Args:  cobra.ExactArgs(0),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			fmt.Println(version.GetVersion(cmd.Context()))
+			return nil
+		},
+	}
+
+	return cmd
+}
diff --git a/go.mod b/go.mod
index 2b0e192..1b9b9b8 100644
--- a/go.mod
+++ b/go.mod
@@ -3,10 +3,12 @@ module github.com/harry-hov/gnopls
 go 1.21.1
 
 require (
+	github.com/google/go-github v17.0.0+incompatible
 	github.com/spf13/cobra v1.5.0
 )
 
 require (
+	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 )
diff --git a/go.sum b/go.sum
index dd95c40..39ac77f 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,7 @@
+github.com/google/go-github v17.0.0+incompatible h1:N0LgJ1j65A7kfXrZnUDaYCs/Sf4rEjNlfyDHW9dolSY=
+github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
+github.com/google/go-querystring v1.1.0 h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD/fhyJ8=
+github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17icRSOU623lUBU=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/spf13/cobra v1.5.0 h1:X+jTBEBqF0bHN+9cSMgmfuvv2VHJ9ezmFNf9Y/XstYU=
diff --git a/internal/version/version.go b/internal/version/version.go
new file mode 100644
index 0000000..737ff8d
--- /dev/null
+++ b/internal/version/version.go
@@ -0,0 +1,40 @@
+package version
+
+import (
+	"context"
+
+	"github.com/google/go-github/github"
+)
+
+const versionUnknown = "v0.0.0-unknown"
+
+var Version string = versionUnknown
+
+func getLatestReleaseTag(ctx context.Context) (string, error) {
+	latest, _, err := github.
+		NewClient(nil).
+		Repositories.
+		GetLatestRelease(ctx, "harry-hov", "gnopls")
+	if err != nil {
+		return "", err
+	}
+
+	if latest.TagName == nil {
+		return "", nil
+	}
+
+	return *latest.TagName, nil
+}
+
+func GetVersion(ctx context.Context) string {
+	if Version != versionUnknown {
+		return Version
+	}
+
+	tag, err := getLatestReleaseTag(ctx)
+	if err != nil {
+		return Version
+	}
+
+	return tag
+}