Add a puku version command (#120)

BUILD

@@ -14,6 +14,7 @@ genrule(
     cmd = "echo VERSION = \\\"$(cat $SRCS)\\\" > $OUT",
     visibility = [
         "//package:all",
+        "//cmd/puku:all",
     ],
 )
 

ChangeLog

@@ -1,3 +1,7 @@
+Version 1.10.0
+-------------
+    * Adds a `puku version` command to report the version of puku that is installed.
+
 Version 1.9.0
 -------------
     * `"stop": false` in a `puku.json` in a subdirectory will override a `"stop": true` in a parent

VERSION

@@ -1 +1 @@
-1.9.0
+1.10.0

cmd/puku/BUILD

@@ -1,6 +1,11 @@
+subinclude("//:version")
+
 go_binary(
     name = "puku",
     srcs = ["puku.go"],
+    definitions = {
+        "github.com/please-build/puku/version.PukuVersion": VERSION,
+    },
     visibility = ["PUBLIC"],
     deps = [
         "///third_party/go/github.com_peterebden_go-cli-init_v5//flags",
@@ -16,5 +21,6 @@ go_binary(
         "//work",
         "//graph",
         "//sync",
+        "//version",
     ],
 )

cmd/puku/puku.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 
@@ -16,6 +17,7 @@ import (
 	"github.com/please-build/puku/please"
 	"github.com/please-build/puku/proxy"
 	"github.com/please-build/puku/sync"
+	"github.com/please-build/puku/version"
 	"github.com/please-build/puku/watch"
 	"github.com/please-build/puku/work"
 )
@@ -24,7 +26,8 @@ var opts = struct {
 	Usage     string
 	Verbosity clilogging.Verbosity `short:"v" long:"verbosity" description:"Verbosity of output (error, warning, notice, info, debug)" default:"info"`
 
-	Fmt struct {
+	Version struct{} `command:"version" description:"Print the version of puku"`
+	Fmt     struct {
 		Args struct {
 			Paths []string `positional-arg-name:"packages" description:"The packages to process"`
 		} `positional-args:"true"`
@@ -147,6 +150,11 @@ func main() {
 	cmd := flags.ParseFlagsOrDie("puku", &opts, nil)
 	logging.InitLogging(opts.Verbosity)
 
+	if cmd == "version" {
+		fmt.Println("puku version", version.PukuVersion)
+		return
+	}
+
 	wd, err := os.Getwd()
 	if err != nil {
 		log.Fatalf("failed to get wd: %v", err)

version/BUILD

@@ -0,0 +1,5 @@
+go_library(
+    name = "version",
+    srcs = ["version.go"],
+    visibility = ["//cmd/puku:all"],
+)

version/version.go

@@ -0,0 +1,6 @@
+// Package version contains the version of Puku.
+package version
+
+// PukuVersion is the current version of Puku.
+// Building //cmd/puku replaces this fake version with a real one.
+var PukuVersion = "99.0.9999"