feat(cmd/gno): add gno version command (#3002)

<!-- please provide a detailed description of the changes made in this
pull request. -->

I've added the `version` command to gno to get the version of gno that
is installed

<details><summary>Contributors' checklist...</summary>

- [ ] Added new tests, or not needed, or not feasible
- [ ] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [ ] Updated the official documentation or not needed
- [ ] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [ ] Added references to related issues and PRs
- [ ] Provided any useful hints for running manual tests
</details>

---------

Co-authored-by: Morgan <[email protected]>

gnovm/Makefile

@@ -27,11 +27,14 @@ GOTEST_FLAGS ?= -v -p 1 -timeout=30m
 GNOROOT_DIR ?= $(abspath $(lastword $(MAKEFILE_LIST))/../../)
 # We can't use '-trimpath' yet as amino use absolute path from call stack
 # to find some directory: see #1236
-GOBUILD_FLAGS ?= -ldflags "-X github.com/gnolang/gno/gnovm/pkg/gnoenv._GNOROOT=$(GNOROOT_DIR)"
+GOBUILD_FLAGS ?= -ldflags "-X github.com/gnolang/gno/gnovm/pkg/version.Version=$(VERSION) -X github.com/gnolang/gno/gnovm/pkg/gnoenv._GNOROOT=$(GNOROOT_DIR)"
 # file where to place cover profile; used for coverage commands which are
 # more complex than adding -coverprofile, like test.cmd.coverage.
 GOTEST_COVER_PROFILE ?= cmd-profile.out
 
+# user for gno version [branch].[N]+[hash]
+VERSION ?= $(shell git describe --tags --exact-match 2>/dev/null || echo "$(shell git rev-parse --abbrev-ref HEAD).$(shell git rev-list --count HEAD)+$(shell git rev-parse --short HEAD)")
+
 ########################################
 # Dev tools
 .PHONY: build

gnovm/cmd/gno/main.go

@@ -41,6 +41,7 @@ func newGnocliCmd(io commands.IO) *commands.Command {
 		newTestCmd(io),
 		newToolCmd(io),
 		// version -- show cmd/gno, golang versions
+		newGnoVersionCmd(io),
 		// vet
 	)
 

gnovm/cmd/gno/version.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"context"
+
+	"github.com/gnolang/gno/gnovm/pkg/version"
+	"github.com/gnolang/gno/tm2/pkg/commands"
+)
+
+// newVersionCmd creates a new version command
+func newGnoVersionCmd(io commands.IO) *commands.Command {
+	return commands.NewCommand(
+		commands.Metadata{
+			Name:       "version",
+			ShortUsage: "version",
+			ShortHelp:  "display installed gno version",
+		},
+		nil,
+		func(_ context.Context, args []string) error {
+			io.Println("gno version:", version.Version)
+			return nil
+		},
+	)
+}

gnovm/cmd/gno/version_test.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/gnolang/gno/gnovm/pkg/version"
+)
+
+func TestVersionApp(t *testing.T) {
+	originalVersion := version.Version
+
+	t.Cleanup(func() {
+		version.Version = originalVersion
+	})
+
+	versionValues := []string{"chain/test4.2", "develop", "master"}
+
+	testCases := make([]testMainCase, len(versionValues))
+	for i, v := range versionValues {
+		testCases[i] = testMainCase{
+			args:                []string{"version"},
+			stdoutShouldContain: "gno version: " + v,
+		}
+	}
+
+	for i, testCase := range testCases {
+		t.Run(versionValues[i], func(t *testing.T) {
+			version.Version = versionValues[i]
+			testMainCaseRun(t, []testMainCase{testCase})
+		})
+	}
+}

gnovm/pkg/version/version.go

@@ -0,0 +1,3 @@
+package version
+
+var Version = "develop"