Show tag information for selected tag

pkg/commands/git_commands/tag.go

@@ -57,3 +57,20 @@ func (self *TagCommands) Push(task gocui.Task, remoteName string, tagName string
 
 	return self.cmd.New(cmdArgs).PromptOnCredentialRequest(task).Run()
 }
+
+// Return info about an annotated tag in the format:
+//
+//	Tagger:     tagger name <tagger email>
+//	TaggerDate: tagger date
+//
+//	Tag message
+//
+// Should only be called for annotated tags.
+func (self *TagCommands) ShowAnnotationInfo(tagName string) (string, error) {
+	cmdArgs := NewGitCmd("for-each-ref").
+		Arg("--format=Tagger:     %(taggername) %(taggeremail)%0aTaggerDate: %(taggerdate)%0a%0a%(contents)").
+		Arg("refs/tags/" + tagName).
+		ToArgv()
+
+	return self.cmd.New(cmdArgs).RunWithOutput()
+}

pkg/gui/controllers/tags_controller.go

@@ -1,11 +1,16 @@
 package controllers
 
 import (
+	"fmt"
+	"strings"
+
 	"github.com/jesseduffield/gocui"
 	"github.com/jesseduffield/lazygit/pkg/commands/models"
 	"github.com/jesseduffield/lazygit/pkg/gui/context"
+	"github.com/jesseduffield/lazygit/pkg/gui/style"
 	"github.com/jesseduffield/lazygit/pkg/gui/types"
 	"github.com/jesseduffield/lazygit/pkg/utils"
+	"github.com/samber/lo"
 )
 
 type TagsController struct {
@@ -96,7 +101,8 @@ func (self *TagsController) GetOnRenderToMain() func() {
 				task = types.NewRenderStringTask("No tags")
 			} else {
 				cmdObj := self.c.Git().Branch.GetGraphCmdObj(tag.FullRefName())
-				task = types.NewRunCommandTask(cmdObj.GetCmd())
+				prefix := self.getTagInfo(tag) + "\n\n---\n\n"
+				task = types.NewRunCommandTaskWithPrefix(cmdObj.GetCmd(), prefix)
 			}
 
 			self.c.RenderToMainViews(types.RefreshMainOpts{
@@ -110,6 +116,35 @@ func (self *TagsController) GetOnRenderToMain() func() {
 	}
 }
 
+func (self *TagsController) getTagInfo(tag *models.Tag) string {
+	if tag.IsAnnotated {
+		info := fmt.Sprintf("%s: %s", self.c.Tr.AnnotatedTag, style.AttrBold.Sprint(style.FgYellow.Sprint(tag.Name)))
+		output, err := self.c.Git().Tag.ShowAnnotationInfo(tag.Name)
+		if err == nil {
+			info += "\n\n" + strings.TrimRight(filterOutPgpSignature(output), "\n")
+		}
+		return info
+	}
+
+	return fmt.Sprintf("%s: %s", self.c.Tr.LightweightTag, style.AttrBold.Sprint(style.FgYellow.Sprint(tag.Name)))
+}
+
+func filterOutPgpSignature(output string) string {
+	lines := strings.Split(output, "\n")
+	inPgpSignature := false
+	filteredLines := lo.Filter(lines, func(line string, _ int) bool {
+		if line == "-----END PGP SIGNATURE-----" {
+			inPgpSignature = false
+			return false
+		}
+		if line == "-----BEGIN PGP SIGNATURE-----" {
+			inPgpSignature = true
+		}
+		return !inPgpSignature
+	})
+	return strings.Join(filteredLines, "\n")
+}
+
 func (self *TagsController) checkout(tag *models.Tag) error {
 	self.c.LogAction(self.c.Tr.Actions.CheckoutTag)
 	if err := self.c.Helpers().Refs.CheckoutRef(tag.FullRefName(), types.CheckoutRefOptions{}); err != nil {