From 2fa2eb7e86fed6cc0b760d55d7323b92eab8641a Mon Sep 17 00:00:00 2001
From: "Frederic G. MARAND" <fgm@osinet.fr>
Date: Mon, 24 May 2021 10:43:11 +0200
Subject: [PATCH 1/3] Issue #4: converted to Wire DI.

---
 .idea/runConfigurations/Clean.xml   |  8 ++++
 .idea/runConfigurations/Run.xml     |  2 +-
 Makefile                            | 36 +++++++++++++++--
 auth.go => credentials.go           | 34 ++++++----------
 auth_test.go => credentials_test.go | 28 ++++++++------
 go.mod                              |  4 +-
 go.sum                              | 12 +++++-
 drupal_redis_stats.go => main.go    | 60 +++++++++++++----------------
 main_test.go                        |  2 +-
 output/output.go                    |  2 +-
 redis.go                            | 45 ++++++++++++++++++++++
 wire.go                             | 14 +++++++
 wire_gen.go                         | 24 ++++++++++++
 13 files changed, 194 insertions(+), 77 deletions(-)
 create mode 100644 .idea/runConfigurations/Clean.xml
 rename auth.go => credentials.go (76%)
 rename auth_test.go => credentials_test.go (93%)
 rename drupal_redis_stats.go => main.go (53%)
 create mode 100644 redis.go
 create mode 100644 wire.go
 create mode 100644 wire_gen.go

diff --git a/.idea/runConfigurations/Clean.xml b/.idea/runConfigurations/Clean.xml
new file mode 100644
index 0000000..5ba1469
--- /dev/null
+++ b/.idea/runConfigurations/Clean.xml
@@ -0,0 +1,8 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Clean" type="MAKEFILE_TARGET_RUN_CONFIGURATION" factoryName="Makefile">
+    <makefile filename="$PROJECT_DIR$/Makefile" target="clean" workingDirectory="" arguments="">
+      <envs />
+    </makefile>
+    <method v="2" />
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Run.xml b/.idea/runConfigurations/Run.xml
index 8bbc776..151df8e 100644
--- a/.idea/runConfigurations/Run.xml
+++ b/.idea/runConfigurations/Run.xml
@@ -2,7 +2,7 @@
   <configuration default="false" name="Run" type="GoApplicationRunConfiguration" factoryName="Go Application">
     <module name="drupal_redis_stats" />
     <working_directory value="$PROJECT_DIR$" />
-    <go_parameters value="-o cache " />
+    <go_parameters value="-o drupal_redis_stats" />
     <parameters value="-pass somepass" />
     <EXTENSION ID="net.ashald.envfile">
       <option name="IS_ENABLED" value="false" />
diff --git a/Makefile b/Makefile
index 0f35e72..4d8af70 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,33 @@
+all: clean lint test build
+
+.PHONY: build
+build: main.go redis.go credentials.go wire.go wire_gen.go output stats
+	@echo Building
+	@go build -o drupal_redis_stats
+
+.PHONY: clean
+clean:
+	@echo Cleaning
+	@rm -f coverage* drupal_redis_stats
+
+.PHONY: install
+install: main.go redis.go credentials.go wire.go wire_gen.go output stats
+	@echo Installing
+	@go install
+
 .PHONY: lint
-lint:
-	find . -type f -name "*.go" | xargs gofmt -l
-	find . -type f -name "*.go" | xargs goimports -l
-	staticcheck ./...
+lint: wire_gen.go
+	@echo Linting
+	@find . -type f -name "*.go" | xargs gofmt -l
+	@find . -type f -name "*.go" | xargs goimports -l
+	@golint ./...
+	@staticcheck ./...
+
+.PHONY: test
+test: wire_gen.go
+	@echo Testing
+	@go test -race ./...
+
+wire_gen.go: credentials.go redis.go wire.go
+	@echo Wiring
+	@go generate
diff --git a/auth.go b/credentials.go
similarity index 76%
rename from auth.go
rename to credentials.go
index 37af1f6..52ee41d 100644
--- a/auth.go
+++ b/credentials.go
@@ -9,10 +9,11 @@ import (
 	"os"
 	"unicode/utf8"
 
-	"github.com/gomodule/redigo/redis"
 	"golang.org/x/term"
 )
 
+// PasswordReader abstracts the term.ReadPassword function, to allow switching
+// it for a version not depending on termios during tests.
 type PasswordReader interface {
 	ReadPassword(int) ([]byte, error)
 }
@@ -23,10 +24,11 @@ func (prf passwordReaderFunc) ReadPassword(fd int) ([]byte, error) {
 	return prf(fd)
 }
 
+// ErrInvalidUTF8 is raised when a string is not valid.
 var ErrInvalidUTF8 = errors.New("input was not a valid UTF-8 string")
 
-func getPasswordFromCLI(w io.Writer, pr PasswordReader, fd int) (string, error) {
-	fmt.Fprint(w, "Password: ")
+func getPasswordFromCLI(w io.Writer, pr PasswordReader, fd int) (passValue, error) {
+	_, _ = fmt.Fprint(w, "Password: ")
 	pBytes, err := pr.ReadPassword(fd)
 	if err != nil {
 		return "", fmt.Errorf("failed acquiring password from terminal without echo: %w", err)
@@ -34,7 +36,7 @@ func getPasswordFromCLI(w io.Writer, pr PasswordReader, fd int) (string, error)
 	if !utf8.Valid(pBytes) {
 		return "", fmt.Errorf("invalid password: %w", ErrInvalidUTF8)
 	}
-	return string(pBytes), nil
+	return passValue(pBytes), nil
 }
 
 // getCredentials combines the user and pass values with those possibly
@@ -42,8 +44,8 @@ func getPasswordFromCLI(w io.Writer, pr PasswordReader, fd int) (string, error)
 // terminal in echo-less mode.
 //
 // Explicit user/pass flags override those found in the DSN.
-func getCredentials(fs *flag.FlagSet, w io.Writer, flagDSN, flagUser, flagPass string) (user, pass string, err error) {
-	user, pass = flagUser, flagPass
+func getCredentials(fs *flag.FlagSet, w io.Writer, flagDSN, flagUser, flagPass string) (user userValue, pass passValue, err error) {
+	user, pass = userValue(flagUser), passValue(flagPass)
 
 	hasDSNFlag := isFlagPassed(fs, "dsn")
 	hasUserFlag := isFlagPassed(fs, "user")
@@ -57,15 +59,15 @@ func getCredentials(fs *flag.FlagSet, w io.Writer, flagDSN, flagUser, flagPass s
 			return "", "", fmt.Errorf("failed parsing Redis DSN: %v", err)
 		}
 		if !hasUserFlag {
-			user = u.User.Username()
+			user = userValue(u.User.Username())
 		}
 		if !hasPassFlag {
 			dsnPass, DSNContainsPass := u.User.Password()
 			if DSNContainsPass {
-				pass = dsnPass
+				pass = passValue(dsnPass)
 			} else {
 				// Redis URL parsing accepts single auth element as password, not user
-				pass = user
+				pass = passValue(user)
 				user = ""
 			}
 		}
@@ -79,17 +81,3 @@ func getCredentials(fs *flag.FlagSet, w io.Writer, flagDSN, flagUser, flagPass s
 	}
 	return
 }
-
-func authenticate(c redis.Conn, includeUser bool, user, pass string) error {
-	var err error
-	if includeUser {
-		_, err = c.Do("AUTH", user, pass)
-	} else {
-		_, err = c.Do("AUTH", pass)
-	}
-	if err != nil {
-		return fmt.Errorf("failed AUTH: %w", err)
-	}
-
-	return nil
-}
diff --git a/auth_test.go b/credentials_test.go
similarity index 93%
rename from auth_test.go
rename to credentials_test.go
index ea98873..a1f7262 100644
--- a/auth_test.go
+++ b/credentials_test.go
@@ -27,7 +27,7 @@ func TestGetPasswordFromCLI(t *testing.T) {
 		name     string
 		reader   PasswordReader
 		input    io.Reader
-		expValue string
+		expValue passValue
 		expError error
 	}{
 		{"test happy", readTestPassword(testPassword), f, testPassword, nil},
@@ -60,10 +60,11 @@ func TestGetPasswordFromCLI(t *testing.T) {
 }
 func TestGetCredentials(t *testing.T) {
 	checks := [...]struct {
-		name             string
-		args             []string
-		expUser, expPass string
-		expError         bool
+		name     string
+		args     []string
+		expUser  userValue
+		expPass  passValue
+		expError bool
 	}{
 		{"nothing, nil", nil, "", "", false},
 		{"bad dsn", []string{"-dsn", ":localhost/0"}, "", "", true},
@@ -104,7 +105,8 @@ func TestGetCredentials(t *testing.T) {
 
 type MockConn struct {
 	RequirePass bool
-	User, Pass  string
+	User        userValue
+	Pass        passValue
 }
 
 func (mc *MockConn) Close() error { return nil }
@@ -149,12 +151,14 @@ func (mc *MockConn) Receive() (reply interface{}, err error) { return nil, nil }
 
 func TestAuthenticate(t *testing.T) {
 	checks := [...]struct {
-		name             string
-		includeUser      bool
-		user, pass       string
-		requirePass      bool // redis.conf requirepass = true
-		aclUser, aclPass string
-		expErr           bool
+		name        string
+		includeUser bool
+		user        userValue
+		pass        passValue
+		requirePass bool // redis.conf requirepass = true
+		aclUser     userValue
+		aclPass     passValue
+		expErr      bool
 	}{
 		{"requirepass, only pass", false, "", "pass", true, "", "pass", false},
 		{"requirepass, no pass", false, "", "", true, "", "pass", true},
diff --git a/go.mod b/go.mod
index d4d709e..5c52e09 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,11 @@
 module github.com/fgm/drupal_redis_stats
 
-go 1.21
+go 1.22
 
 require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gomodule/redigo v1.8.9
+	github.com/google/wire v0.5.0
 	github.com/morikuni/aec v1.0.0
 	golang.org/x/term v0.17.0
 )
diff --git a/go.sum b/go.sum
index 8ee7c7c..9b35178 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,12 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/gomodule/redigo v1.8.9 h1:Sl3u+2BI/kk+VEatbj0scLdrFhjPmbxOc1myhDP41ws=
 github.com/gomodule/redigo v1.8.9/go.mod h1:7ArFNvsTjH8GMMzB4uy1snslv2BwmginuMs06a1uzZE=
+github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/google/subcommands v1.0.1/go.mod h1:ZjhPrFU+Olkh9WazFPsl27BQ4UPiG37m3yTrtFlrHVk=
+github.com/google/wire v0.5.0 h1:I7ELFeVBr3yfPIcc8+MWvrjk+3VjbcSzoXm3JVa+jD8=
+github.com/google/wire v0.5.0/go.mod h1:ngWDr9Qvq3yZA10YrxfyGELY/AFWGVpy9c1LTRi1EoU=
 github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=
 github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -9,10 +14,15 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
 golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.17.0 h1:mkTF7LCd6WGJNL3K1Ad7kwxNfYAW6a8a8QqtMblp/4U=
 golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190422233926-fe54fb35175b/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/drupal_redis_stats.go b/main.go
similarity index 53%
rename from drupal_redis_stats.go
rename to main.go
index 0f7b411..a6198c2 100644
--- a/drupal_redis_stats.go
+++ b/main.go
@@ -13,13 +13,11 @@ import (
 	"log"
 	"os"
 
-	"github.com/gomodule/redigo/redis"
-
 	"github.com/fgm/drupal_redis_stats/output"
 	"github.com/fgm/drupal_redis_stats/stats"
 )
 
-func getVerboseWriter(quiet bool) io.Writer {
+func getVerboseWriter(quiet quietValue) io.Writer {
 	if quiet {
 		return ioutil.Discard
 	}
@@ -36,46 +34,42 @@ func isFlagPassed(fs *flag.FlagSet, name string) bool {
 	return found
 }
 
-// open the Redis connection and authenticate is needed.
-func open(dsn *string, user string, pass string, fs *flag.FlagSet) (redis.Conn, error) {
-	var c redis.Conn
-	var err error
-
-	// Connect to the server (ex: DB #1, default #0).
-	if c, err = redis.DialURL(*dsn); err != nil {
-		return nil, fmt.Errorf("failed dialing Redis URL: %w", err)
-	}
-
-	if user != "" || pass != "" {
-		if err = authenticate(c, isFlagPassed(fs, "user"), user, pass); err != nil {
-			return nil, err
-		}
-	}
-	return c, err
-}
-
-func main() {
-	var user, pass string
-	var err error
-	var quiet bool
+type (
+	dsnValue   string
+	jsonValue  bool
+	passValue  string
+	quietValue bool
+	userValue  string
+)
 
+func configure(args []string) (*flag.FlagSet, dsnValue, userValue, passValue, jsonValue, quietValue, error) {
 	fs := flag.NewFlagSet("cli", flag.ContinueOnError)
+	flagDSN := fs.String("dsn", "redis://localhost:6379/0", "Can include user and password, per https://www.iana.org/assignments/uri-schemes/prov/redis")
 	flagUser := fs.String("user", "", "user name if Redis is configured with ACL. Overrides the DSN user.")
 	flagPass := fs.String("pass", "", "Password. If it is empty it's asked from the tty. Overrides the DSN password.")
-	dsn := fs.String("dsn", "redis://localhost:6379/0", "Can include user and password, per https://www.iana.org/assignments/uri-schemes/prov/redis")
 	jsonOutput := fs.Bool("json", false, "Use JSON output.")
-	fs.BoolVar(&quiet, "q", false, "Do not display scan progress")
-	if err := fs.Parse(os.Args[1:]); err != nil {
+	quiet := fs.Bool("q", false, "Do not display scan progress")
+	if err := fs.Parse(args); err != nil {
 		log.Fatalf("failed parsing flags: %v", err)
 	}
 
-	verboseWriter := getVerboseWriter(quiet)
+	user, pass, err := getCredentials(fs, os.Stdout, *flagDSN, *flagUser, *flagPass)
+	if err != nil {
+		return nil, "", "", "", false, false, fmt.Errorf("failed obtaining user/pass: %v", err)
+	}
+
+	return fs, dsnValue(*flagDSN), user, pass, jsonValue(*jsonOutput), quietValue(*quiet), nil
+}
 
-	if user, pass, err = getCredentials(fs, os.Stdout, *dsn, *flagUser, *flagPass); err != nil {
-		log.Fatalf("failed obtaining user/pass: %v", err)
+func main() {
+	fs, dsn, user, pass, jsonOutput, quiet, err := configure(os.Args[1:])
+	if err != nil {
+		log.Fatalf("failed configuring: %v", err)
 	}
 
-	c, err := open(dsn, user, pass, fs)
+	verboseWriter := getVerboseWriter(quiet)
+
+	c, err := wireAuthConn(fs, dsn, user, pass)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -86,7 +80,7 @@ func main() {
 		log.Fatalf("failed SCAN: %v", err)
 	}
 
-	if *jsonOutput {
+	if jsonOutput {
 		_ = output.JSON(os.Stderr, &stats)
 	} else {
 		output.Text(os.Stdout, &stats)
diff --git a/main_test.go b/main_test.go
index 88f7248..7a83b88 100644
--- a/main_test.go
+++ b/main_test.go
@@ -39,7 +39,7 @@ func TestIsFlagPassed(t *testing.T) {
 func TestGetVerboseWriter(t *testing.T) {
 	checks := [...]struct {
 		name         string
-		quiet        bool
+		quiet        quietValue
 		expectedType string
 	}{
 		{"true", true, "io.discard"},
diff --git a/output/output.go b/output/output.go
index be87ccc..6b6942d 100644
--- a/output/output.go
+++ b/output/output.go
@@ -2,7 +2,7 @@
 package output
 
 import (
-	_ "embed"
+	_ "embed" // Imported for templates embedding.
 	"encoding/json"
 	"errors"
 	"fmt"
diff --git a/redis.go b/redis.go
new file mode 100644
index 0000000..4026e52
--- /dev/null
+++ b/redis.go
@@ -0,0 +1,45 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+
+	"github.com/gomodule/redigo/redis"
+)
+
+// AuthConn is a redis.Conn which is is automatically authenticated if needed.
+type AuthConn struct {
+	redis.Conn
+}
+
+// newAuthConn authenticates the passed redis.Conn if needed.
+func newAuthConn(baseConn redis.Conn, fs *flag.FlagSet, user userValue, pass passValue) (*AuthConn, error) {
+	ac := AuthConn{Conn: baseConn}
+	var err error
+
+	if user != "" || pass != "" {
+		if err = authenticate(ac, isFlagPassed(fs, "user"), user, pass); err != nil {
+			return nil, err
+		}
+	}
+	return &ac, err
+}
+
+func newBaseConn(dsn dsnValue) (redis.Conn, error) {
+	return redis.DialURL(string(dsn))
+}
+
+func authenticate(c redis.Conn, includeUser bool, user userValue, pass passValue) error {
+	var err error
+
+	if includeUser {
+		_, err = c.Do("AUTH", user, pass)
+	} else {
+		_, err = c.Do("AUTH", pass)
+	}
+	if err != nil {
+		return fmt.Errorf("failed AUTH: %w", err)
+	}
+
+	return nil
+}
diff --git a/wire.go b/wire.go
new file mode 100644
index 0000000..75e32d3
--- /dev/null
+++ b/wire.go
@@ -0,0 +1,14 @@
+//+build wireinject
+
+package main
+
+import (
+	"flag"
+
+	"github.com/google/wire"
+)
+
+func wireAuthConn(fs *flag.FlagSet, dsn dsnValue, user userValue, pass passValue) (*AuthConn, error) {
+	wire.Build(newAuthConn, newBaseConn)
+	return &AuthConn{}, nil
+}
diff --git a/wire_gen.go b/wire_gen.go
new file mode 100644
index 0000000..cd26103
--- /dev/null
+++ b/wire_gen.go
@@ -0,0 +1,24 @@
+// Code generated by Wire. DO NOT EDIT.
+
+//go:generate go run github.com/google/wire/cmd/wire
+//+build !wireinject
+
+package main
+
+import (
+	"flag"
+)
+
+// Injectors from wire.go:
+
+func wireAuthConn(fs *flag.FlagSet, dsn dsnValue, user userValue, pass passValue) (*AuthConn, error) {
+	conn, err := newBaseConn(dsn)
+	if err != nil {
+		return nil, err
+	}
+	authConn, err := newAuthConn(conn, fs, user, pass)
+	if err != nil {
+		return nil, err
+	}
+	return authConn, nil
+}

From 2c7665663f4bb3e92fd5ef56dbdb2b75c7e94fc2 Mon Sep 17 00:00:00 2001
From: "Frederic G. MARAND" <fgm@osinet.fr>
Date: Mon, 24 May 2021 18:41:21 +0200
Subject: [PATCH 2/3] Refactored to Cobra, more Wire injection.

---
 .idea/runConfigurations/Run.xml               |   2 +-
 LICENSE                                       | 202 ++++++++++++
 Makefile                                      |  12 +-
 credentials.go => cmd/credentials.go          |  46 +--
 .../credentials_test.go                       |  46 +--
 cmd/root.go                                   |  89 ++++++
 cmd/stats.go                                  |  49 +++
 cmd/stats_test.go                             |  28 ++
 cmd/wire.go                                   |  21 ++
 cmd/wire_gen.go                               |  39 +++
 go.mod                                        |  22 +-
 go.sum                                        | 298 ++++++++++++++++++
 main.go                                       |  83 +----
 main_test.go                                  |  57 ----
 output/output.go                              |  15 +-
 output/output_test.go                         |  22 +-
 redis.go                                      |  45 ---
 redis/redis.go                                |  47 +++
 redis/redis_test.go                           |  39 +++
 redis/types.go                                |  84 +++++
 redis/types_test.go                           |  47 +++
 stats/scanner.go                              |  98 ++++++
 stats/stats.go                                |  73 -----
 wire.go                                       |  14 -
 wire_gen.go                                   |  24 --
 25 files changed, 1137 insertions(+), 365 deletions(-)
 create mode 100644 LICENSE
 rename credentials.go => cmd/credentials.go (63%)
 rename credentials_test.go => cmd/credentials_test.go (77%)
 create mode 100644 cmd/root.go
 create mode 100644 cmd/stats.go
 create mode 100644 cmd/stats_test.go
 create mode 100644 cmd/wire.go
 create mode 100644 cmd/wire_gen.go
 delete mode 100644 main_test.go
 delete mode 100644 redis.go
 create mode 100644 redis/redis.go
 create mode 100644 redis/redis_test.go
 create mode 100644 redis/types.go
 create mode 100644 redis/types_test.go
 create mode 100644 stats/scanner.go
 delete mode 100644 wire.go
 delete mode 100644 wire_gen.go

diff --git a/.idea/runConfigurations/Run.xml b/.idea/runConfigurations/Run.xml
index 151df8e..9fd20fc 100644
--- a/.idea/runConfigurations/Run.xml
+++ b/.idea/runConfigurations/Run.xml
@@ -3,7 +3,7 @@
     <module name="drupal_redis_stats" />
     <working_directory value="$PROJECT_DIR$" />
     <go_parameters value="-o drupal_redis_stats" />
-    <parameters value="-pass somepass" />
+    <parameters value="-p somepass" />
     <EXTENSION ID="net.ashald.envfile">
       <option name="IS_ENABLED" value="false" />
       <option name="IS_SUBST" value="false" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
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+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
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+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
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+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
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+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
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+
+   4. Redistribution. You may reproduce and distribute copies of the
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
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+          stating that You changed the files; and
+
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+          notices within Derivative Works that You distribute, alongside
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+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      risks associated with Your exercise of permissions under this License.
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+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
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+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
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+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+      file or class name and description of purpose be included on the
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+
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+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/Makefile b/Makefile
index 4d8af70..d257d44 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 all: clean lint test build
 
 .PHONY: build
-build: main.go redis.go credentials.go wire.go wire_gen.go output stats
+build: main.go cmd output redis stats
 	@echo Building
 	@go build -o drupal_redis_stats
 
@@ -11,12 +11,12 @@ clean:
 	@rm -f coverage* drupal_redis_stats
 
 .PHONY: install
-install: main.go redis.go credentials.go wire.go wire_gen.go output stats
+install: main.go cmd/credentials.go cmd/wire.go cmd/wire_gen.go output redis stats
 	@echo Installing
 	@go install
 
 .PHONY: lint
-lint: wire_gen.go
+lint: cmd/wire_gen.go
 	@echo Linting
 	@find . -type f -name "*.go" | xargs gofmt -l
 	@find . -type f -name "*.go" | xargs goimports -l
@@ -24,10 +24,10 @@ lint: wire_gen.go
 	@staticcheck ./...
 
 .PHONY: test
-test: wire_gen.go
+test: cmd output redis stats cmd/wire_gen.go
 	@echo Testing
 	@go test -race ./...
 
-wire_gen.go: credentials.go redis.go wire.go
+cmd/wire_gen.go: cmd/wire.go redis stats
 	@echo Wiring
-	@go generate
+	@go generate ./...
diff --git a/credentials.go b/cmd/credentials.go
similarity index 63%
rename from credentials.go
rename to cmd/credentials.go
index 52ee41d..4c1f18c 100644
--- a/credentials.go
+++ b/cmd/credentials.go
@@ -1,15 +1,17 @@
-package main
+package cmd
 
 import (
 	"errors"
-	"flag"
 	"fmt"
 	"io"
 	"net/url"
 	"os"
 	"unicode/utf8"
 
+	"github.com/spf13/pflag"
 	"golang.org/x/term"
+
+	"github.com/fgm/drupal_redis_stats/redis"
 )
 
 // PasswordReader abstracts the term.ReadPassword function, to allow switching
@@ -27,7 +29,7 @@ func (prf passwordReaderFunc) ReadPassword(fd int) ([]byte, error) {
 // ErrInvalidUTF8 is raised when a string is not valid.
 var ErrInvalidUTF8 = errors.New("input was not a valid UTF-8 string")
 
-func getPasswordFromCLI(w io.Writer, pr PasswordReader, fd int) (passValue, error) {
+func getPasswordFromCLI(w io.Writer, pr PasswordReader, fd int) (redis.PassValue, error) {
 	_, _ = fmt.Fprint(w, "Password: ")
 	pBytes, err := pr.ReadPassword(fd)
 	if err != nil {
@@ -36,7 +38,7 @@ func getPasswordFromCLI(w io.Writer, pr PasswordReader, fd int) (passValue, erro
 	if !utf8.Valid(pBytes) {
 		return "", fmt.Errorf("invalid password: %w", ErrInvalidUTF8)
 	}
-	return passValue(pBytes), nil
+	return redis.PassValue(pBytes), nil
 }
 
 // getCredentials combines the user and pass values with those possibly
@@ -44,40 +46,44 @@ func getPasswordFromCLI(w io.Writer, pr PasswordReader, fd int) (passValue, erro
 // terminal in echo-less mode.
 //
 // Explicit user/pass flags override those found in the DSN.
-func getCredentials(fs *flag.FlagSet, w io.Writer, flagDSN, flagUser, flagPass string) (user userValue, pass passValue, err error) {
-	user, pass = userValue(flagUser), passValue(flagPass)
-
-	hasDSNFlag := isFlagPassed(fs, "dsn")
-	hasUserFlag := isFlagPassed(fs, "user")
-	hasPassFlag := isFlagPassed(fs, "pass")
+func getCredentials(fs *pflag.FlagSet, w io.Writer, dsn redis.DSNValue, flagUser redis.UserValue, flagPass redis.PassValue) (user redis.UserValue, pass redis.PassValue, err error) {
+	hasDSNFlag := redis.IsFlagPassed(fs, "dsn")
+	hasUserFlag := redis.IsFlagPassed(fs, "user")
+	hasPassFlag := redis.IsFlagPassed(fs, "pass")
 
 	if hasDSNFlag && (!hasUserFlag || !hasPassFlag) {
 		var u *url.URL
 
-		u, err = url.Parse(flagDSN)
+		u, err = url.Parse(string(dsn))
 		if err != nil {
 			return "", "", fmt.Errorf("failed parsing Redis DSN: %v", err)
 		}
 		if !hasUserFlag {
-			user = userValue(u.User.Username())
+			user = redis.UserValue(u.User.Username())
 		}
 		if !hasPassFlag {
 			dsnPass, DSNContainsPass := u.User.Password()
 			if DSNContainsPass {
-				pass = passValue(dsnPass)
+				pass = redis.PassValue(dsnPass)
 			} else {
 				// Redis URL parsing accepts single auth element as password, not user
-				pass = passValue(user)
+				pass = redis.PassValue(user)
 				user = ""
 			}
 		}
 	}
-
-	if hasPassFlag && flagPass == "" {
-		pass, err = getPasswordFromCLI(w, passwordReaderFunc(term.ReadPassword), int(os.Stdin.Fd()))
-		if err != nil {
-			return "", "", err
+	if hasUserFlag {
+		user = flagUser
+	}
+	if hasPassFlag {
+		if flagPass == "" {
+			pass, err = getPasswordFromCLI(w, passwordReaderFunc(term.ReadPassword), int(os.Stdin.Fd()))
+			if err != nil {
+				return "", "", err
+			}
+		} else {
+			pass = flagPass
 		}
 	}
-	return
+	return user, pass, nil
 }
diff --git a/credentials_test.go b/cmd/credentials_test.go
similarity index 77%
rename from credentials_test.go
rename to cmd/credentials_test.go
index a1f7262..b4b30cf 100644
--- a/credentials_test.go
+++ b/cmd/credentials_test.go
@@ -1,15 +1,17 @@
-package main
+package cmd
 
 import (
 	"errors"
-	"flag"
 	"fmt"
 	"io"
 	"os"
 	"syscall"
 	"testing"
 
+	"github.com/spf13/pflag"
 	"golang.org/x/term"
+
+	"github.com/fgm/drupal_redis_stats/redis"
 )
 
 const testPassword = "test-password"
@@ -27,7 +29,7 @@ func TestGetPasswordFromCLI(t *testing.T) {
 		name     string
 		reader   PasswordReader
 		input    io.Reader
-		expValue passValue
+		expValue redis.PassValue
 		expError error
 	}{
 		{"test happy", readTestPassword(testPassword), f, testPassword, nil},
@@ -62,24 +64,24 @@ func TestGetCredentials(t *testing.T) {
 	checks := [...]struct {
 		name     string
 		args     []string
-		expUser  userValue
-		expPass  passValue
+		expUser  redis.UserValue
+		expPass  redis.PassValue
 		expError bool
 	}{
 		{"nothing, nil", nil, "", "", false},
-		{"bad dsn", []string{"-dsn", ":localhost/0"}, "", "", true},
-		{"dsn, no info", []string{"-dsn", "redis://localhost/0"}, "", "", false},
-		{"dsn, only pass", []string{"-dsn", "redis://pass@localhost/0"}, "", "pass", false},
-		{"dsn, only empty pass", []string{"-dsn", "redis://@localhost/0"}, "", "", false},
-		{"dsn, user+pass", []string{"-dsn", "redis://foo:bar@localhost/0"}, "foo", "bar", false},
-		{"dsn, user override", []string{"-dsn", "redis://foo:bar@localhost/0", "-user", "u"}, "u", "bar", false},
-		{"dsn, pass override", []string{"-dsn", "redis://foo:bar@localhost/0", "-pass", "p"}, "foo", "p", false},
+		{"bad dsn", []string{"--dsn", ":localhost/0"}, "", "", true},
+		{"dsn, no info", []string{"--dsn", "redis://localhost/0"}, "", "", false},
+		{"dsn, only pass", []string{"--dsn", "redis://pass@localhost/0"}, "", "pass", false},
+		{"dsn, only empty pass", []string{"--dsn", "redis://@localhost/0"}, "", "", false},
+		{"dsn, user+pass", []string{"--dsn", "redis://foo:bar@localhost/0"}, "foo", "bar", false},
+		{"dsn, user override", []string{"--dsn", "redis://foo:bar@localhost/0", "--user", "u"}, "u", "bar", false},
+		{"dsn, pass override", []string{"--dsn", "redis://foo:bar@localhost/0", "--pass", "p"}, "foo", "p", false},
 		// Expect error because, during tests, stdIn is not a terminal
-		{"dsn, empty pass flag", []string{"-dsn", "redis://localhost/0", "-pass", ""}, "", "", true},
+		{"dsn, empty pass flag", []string{"--dsn", "redis://localhost/0", "--pass", ""}, "", "", true},
 	}
 	for _, check := range checks {
 		t.Run(check.name, func(t *testing.T) {
-			fs := flag.NewFlagSet("test", flag.ContinueOnError)
+			fs := pflag.NewFlagSet("test", pflag.ContinueOnError)
 			userFlag := fs.String("user", "", "")
 			passFlag := fs.String("pass", "", "")
 			dsnFlag := fs.String("dsn", "", "")
@@ -87,7 +89,7 @@ func TestGetCredentials(t *testing.T) {
 			if err != nil && !check.expError {
 				t.Fatalf("Unexpected error: %v", err)
 			}
-			user, pass, err := getCredentials(fs, io.Discard, *dsnFlag, *userFlag, *passFlag)
+			user, pass, err := getCredentials(fs, io.Discard, redis.DSNValue(*dsnFlag), redis.UserValue(*userFlag), redis.PassValue(*passFlag))
 			// Redis interprets redis://foo@host as having foo for password, not for user,
 			// unlike normal URL auth parsing.
 			if err != nil && !check.expError {
@@ -105,8 +107,8 @@ func TestGetCredentials(t *testing.T) {
 
 type MockConn struct {
 	RequirePass bool
-	User        userValue
-	Pass        passValue
+	User        redis.UserValue
+	Pass        redis.PassValue
 }
 
 func (mc *MockConn) Close() error { return nil }
@@ -153,11 +155,11 @@ func TestAuthenticate(t *testing.T) {
 	checks := [...]struct {
 		name        string
 		includeUser bool
-		user        userValue
-		pass        passValue
+		user        redis.UserValue
+		pass        redis.PassValue
 		requirePass bool // redis.conf requirepass = true
-		aclUser     userValue
-		aclPass     passValue
+		aclUser     redis.UserValue
+		aclPass     redis.PassValue
 		expErr      bool
 	}{
 		{"requirepass, only pass", false, "", "pass", true, "", "pass", false},
@@ -173,7 +175,7 @@ func TestAuthenticate(t *testing.T) {
 				User:        check.aclUser,
 				Pass:        check.aclPass,
 			}
-			err := authenticate(conn, check.includeUser, check.user, check.pass)
+			err := redis.Authenticate(conn, check.includeUser, check.user, check.pass)
 			if err != nil && !check.expErr {
 				t.Fatalf("unexpected error: %v", err)
 			} else if err == nil && check.expErr {
diff --git a/cmd/root.go b/cmd/root.go
new file mode 100644
index 0000000..d9ab300
--- /dev/null
+++ b/cmd/root.go
@@ -0,0 +1,89 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"path"
+
+	"github.com/spf13/cobra"
+
+	"github.com/mitchellh/go-homedir"
+	"github.com/spf13/viper"
+
+	"github.com/fgm/drupal_redis_stats/redis"
+)
+
+var (
+	cfgFile    string
+	dsn        redis.DSNValue = "redis://localhost:6379/0"
+	jsonOutput redis.JSONValue
+	quiet      redis.QuietValue
+	user       redis.UserValue
+	pass       redis.PassValue
+)
+
+// rootCmd represents the base command when called without any subcommands
+var rootCmd = &cobra.Command{
+	Use:               path.Base(os.Args[0]),
+	Short:             "Drupal Redis cache control",
+	Long:              `Commands helping with the use of the Redis cache in Drupal 8/9.`,
+	RunE:              statsRun,
+	PersistentPreRunE: rootPreRunE,
+}
+
+// Execute adds all child commands to the root command and sets flags appropriately.
+// This is called by main.main(). It only needs to happen once to the rootCmd.
+func Execute() {
+	rootInit()
+	statsInit()
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func rootInit() {
+	cobra.OnInitialize(initConfig)
+	pf := rootCmd.PersistentFlags()
+	pf.StringVar(&cfgFile, "config", "", "config file (default is $HOME/.drupal_redis_stats.yaml)")
+	pf.Var(&dsn, "dsn", "Can include user and password, per https://www.iana.org/assignments/uri-schemes/prov/redis")
+	pf.VarP(&user, "user", "u", "user name if Redis is configured with ACL. Overrides the DSN user.")
+	pf.VarP(&pass, "pass", "p", "Password. If it is empty it's asked from the tty. Overrides the DSN password.")
+	pf.VarP(&jsonOutput, "json", "j", "Use JSON output.")
+	pf.VarP(&quiet, "quiet", "q", "Do not display scan progress")
+}
+
+// initConfig reads in config file and ENV variables if set.
+func initConfig() {
+	if cfgFile != "" {
+		// Use config file from the flag.
+		viper.SetConfigFile(cfgFile)
+	} else {
+		// Find home directory.
+		home, err := homedir.Dir()
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+		// Search config in home directory with name ".drupal_redis_stats" (without extension).
+		viper.AddConfigPath(home)
+		viper.SetConfigName(".drupal_redis_stats")
+	}
+
+	viper.AutomaticEnv() // read in environment variables that match
+
+	// If a config file is found, read it in.
+	if err := viper.ReadInConfig(); err == nil {
+		fmt.Println("Using config file:", viper.ConfigFileUsed())
+	}
+}
+
+func rootPreRunE(cmd *cobra.Command, _ []string) error {
+	var err error
+	user, pass, err = getCredentials(cmd.Flags(), os.Stdout, dsn, user, pass)
+	if err != nil {
+		return fmt.Errorf("failed obtaining user/pass: %v", err)
+	}
+	return nil
+}
diff --git a/cmd/stats.go b/cmd/stats.go
new file mode 100644
index 0000000..aa58cad
--- /dev/null
+++ b/cmd/stats.go
@@ -0,0 +1,49 @@
+package cmd
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+
+	"github.com/spf13/cobra"
+
+	"github.com/fgm/drupal_redis_stats/output"
+	"github.com/fgm/drupal_redis_stats/redis"
+)
+
+// statsCmd represents the stats command
+var statsCmd = &cobra.Command{
+	Use:   "stats",
+	Short: "show cache stats",
+	Long:  `Build a list of statistics per Drupal cache bin.`,
+	RunE:  statsRun,
+}
+
+func getVerboseWriter(quiet redis.QuietValue) io.Writer {
+	if quiet {
+		return ioutil.Discard
+	}
+	return os.Stderr
+}
+func statsInit() {
+	rootCmd.AddCommand(statsCmd)
+}
+
+func statsRun(cmd *cobra.Command, args []string) error {
+	verboseWriter := getVerboseWriter(quiet)
+	scanner, err := wireStatsScanner(cmd.Flags(), dsn, user, pass)
+	if err != nil {
+		return err
+	}
+	defer scanner.Close()
+
+	s, err := scanner.Scan(verboseWriter, 0)
+	if err != nil {
+		return err
+	}
+
+	if jsonOutput {
+		return output.JSON(os.Stdout, s)
+	}
+	return output.Text(os.Stdout, s)
+}
diff --git a/cmd/stats_test.go b/cmd/stats_test.go
new file mode 100644
index 0000000..23b80cc
--- /dev/null
+++ b/cmd/stats_test.go
@@ -0,0 +1,28 @@
+package cmd
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/fgm/drupal_redis_stats/redis"
+)
+
+func TestGetVerboseWriter(t *testing.T) {
+	checks := [...]struct {
+		name         string
+		quiet        redis.QuietValue
+		expectedType string
+	}{
+		{"true", true, "io.discard"},
+		{"false", false, "*os.File"},
+	}
+	for _, check := range checks {
+		t.Run(check.name, func(t *testing.T) {
+			actual := getVerboseWriter(check.quiet)
+			actualType := fmt.Sprintf("%T", actual)
+			if actualType != check.expectedType {
+				t.Errorf("Expected %s, got %s", actualType, check.expectedType)
+			}
+		})
+	}
+}
diff --git a/cmd/wire.go b/cmd/wire.go
new file mode 100644
index 0000000..9d0184b
--- /dev/null
+++ b/cmd/wire.go
@@ -0,0 +1,21 @@
+// +build wireinject
+
+package cmd
+
+import (
+	"github.com/google/wire"
+	"github.com/spf13/pflag"
+
+	"github.com/fgm/drupal_redis_stats/redis"
+	"github.com/fgm/drupal_redis_stats/stats"
+)
+
+func wireAuthConn(fs *pflag.FlagSet, dsn redis.DSNValue, user redis.UserValue, pass redis.PassValue) (*redis.AuthConn, error) {
+	wire.Build(redis.NewAuthConn, redis.NewBaseConn)
+	return &redis.AuthConn{}, nil
+}
+
+func wireStatsScanner(fs *pflag.FlagSet, dsn redis.DSNValue, user redis.UserValue, pass redis.PassValue) (stats.Scanner, error) {
+	wire.Build(stats.NewScanner, redis.NewAuthConn, redis.NewBaseConn)
+	return &stats.RealScanner{}, nil
+}
diff --git a/cmd/wire_gen.go b/cmd/wire_gen.go
new file mode 100644
index 0000000..8de15ab
--- /dev/null
+++ b/cmd/wire_gen.go
@@ -0,0 +1,39 @@
+// Code generated by Wire. DO NOT EDIT.
+
+//go:generate go run github.com/google/wire/cmd/wire
+//+build !wireinject
+
+package cmd
+
+import (
+	"github.com/fgm/drupal_redis_stats/redis"
+	"github.com/fgm/drupal_redis_stats/stats"
+	"github.com/spf13/pflag"
+)
+
+// Injectors from wire.go:
+
+func wireAuthConn(fs *pflag.FlagSet, dsn2 redis.DSNValue, user2 redis.UserValue, pass2 redis.PassValue) (*redis.AuthConn, error) {
+	conn, err := redis.NewBaseConn(dsn2)
+	if err != nil {
+		return nil, err
+	}
+	authConn, err := redis.NewAuthConn(conn, fs, user2, pass2)
+	if err != nil {
+		return nil, err
+	}
+	return authConn, nil
+}
+
+func wireStatsScanner(fs *pflag.FlagSet, dsn2 redis.DSNValue, user2 redis.UserValue, pass2 redis.PassValue) (stats.Scanner, error) {
+	conn, err := redis.NewBaseConn(dsn2)
+	if err != nil {
+		return nil, err
+	}
+	authConn, err := redis.NewAuthConn(conn, fs, user2, pass2)
+	if err != nil {
+		return nil, err
+	}
+	scanner := stats.NewScanner(authConn)
+	return scanner, nil
+}
diff --git a/go.mod b/go.mod
index 5c52e09..7a7436f 100644
--- a/go.mod
+++ b/go.mod
@@ -3,11 +3,29 @@ module github.com/fgm/drupal_redis_stats
 go 1.22
 
 require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gomodule/redigo v1.8.9
 	github.com/google/wire v0.5.0
+	github.com/mitchellh/go-homedir v1.1.0
 	github.com/morikuni/aec v1.0.0
+	github.com/spf13/cobra v1.1.3
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.7.0
 	golang.org/x/term v0.17.0
 )
 
-require golang.org/x/sys v0.17.0 // indirect
+require (
+	github.com/fsnotify/fsnotify v1.4.7 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/magiconair/properties v1.8.1 // indirect
+	github.com/mitchellh/mapstructure v1.1.2 // indirect
+	github.com/pelletier/go-toml v1.2.0 // indirect
+	github.com/spf13/afero v1.1.2 // indirect
+	github.com/spf13/cast v1.3.0 // indirect
+	github.com/spf13/jwalterweatherman v1.0.0 // indirect
+	github.com/subosito/gotenv v1.2.0 // indirect
+	golang.org/x/sys v0.17.0 // indirect
+	golang.org/x/text v0.3.2 // indirect
+	gopkg.in/ini.v1 v1.51.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
diff --git a/go.sum b/go.sum
index 9b35178..0521a9c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,28 +1,326 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
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diff --git a/main.go b/main.go
index a6198c2..5a86849 100644
--- a/main.go
+++ b/main.go
@@ -1,88 +1,15 @@
 /*
-This simple CLI application scans a Redis database for Drupal 8 cache content.
+This simple CLI application scans a Redis database for Drupal 8/9 cache content.
 
-It then return statistics about that instance, in plain text or JSON.
+It then return statistics about that instance, in plain text or JSON, and allows
+clearing that cache.
 */
 package main
 
 import (
-	"flag"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"log"
-	"os"
-
-	"github.com/fgm/drupal_redis_stats/output"
-	"github.com/fgm/drupal_redis_stats/stats"
-)
-
-func getVerboseWriter(quiet quietValue) io.Writer {
-	if quiet {
-		return ioutil.Discard
-	}
-	return os.Stderr
-}
-
-func isFlagPassed(fs *flag.FlagSet, name string) bool {
-	found := false
-	fs.Visit(func(f *flag.Flag) {
-		if f.Name == name {
-			found = true
-		}
-	})
-	return found
-}
-
-type (
-	dsnValue   string
-	jsonValue  bool
-	passValue  string
-	quietValue bool
-	userValue  string
+	"github.com/fgm/drupal_redis_stats/cmd"
 )
 
-func configure(args []string) (*flag.FlagSet, dsnValue, userValue, passValue, jsonValue, quietValue, error) {
-	fs := flag.NewFlagSet("cli", flag.ContinueOnError)
-	flagDSN := fs.String("dsn", "redis://localhost:6379/0", "Can include user and password, per https://www.iana.org/assignments/uri-schemes/prov/redis")
-	flagUser := fs.String("user", "", "user name if Redis is configured with ACL. Overrides the DSN user.")
-	flagPass := fs.String("pass", "", "Password. If it is empty it's asked from the tty. Overrides the DSN password.")
-	jsonOutput := fs.Bool("json", false, "Use JSON output.")
-	quiet := fs.Bool("q", false, "Do not display scan progress")
-	if err := fs.Parse(args); err != nil {
-		log.Fatalf("failed parsing flags: %v", err)
-	}
-
-	user, pass, err := getCredentials(fs, os.Stdout, *flagDSN, *flagUser, *flagPass)
-	if err != nil {
-		return nil, "", "", "", false, false, fmt.Errorf("failed obtaining user/pass: %v", err)
-	}
-
-	return fs, dsnValue(*flagDSN), user, pass, jsonValue(*jsonOutput), quietValue(*quiet), nil
-}
-
 func main() {
-	fs, dsn, user, pass, jsonOutput, quiet, err := configure(os.Args[1:])
-	if err != nil {
-		log.Fatalf("failed configuring: %v", err)
-	}
-
-	verboseWriter := getVerboseWriter(quiet)
-
-	c, err := wireAuthConn(fs, dsn, user, pass)
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer c.Close()
-
-	var stats stats.CacheStats
-	if err = stats.Scan(c, 0, verboseWriter); err != nil {
-		log.Fatalf("failed SCAN: %v", err)
-	}
-
-	if jsonOutput {
-		_ = output.JSON(os.Stderr, &stats)
-	} else {
-		output.Text(os.Stdout, &stats)
-	}
+	cmd.Execute()
 }
diff --git a/main_test.go b/main_test.go
deleted file mode 100644
index 7a83b88..0000000
--- a/main_test.go
+++ /dev/null
@@ -1,57 +0,0 @@
-package main
-
-import (
-	"flag"
-	"fmt"
-	"testing"
-)
-
-func TestIsFlagPassed(t *testing.T) {
-	const name = "f1"
-
-	checks := [...]struct {
-		name     string
-		args     []string
-		expected bool
-	}{
-		{"no, nil", nil, false},
-		{"no, no flags", []string{}, false},
-		{"no, other flags", []string{"-f2", "v2"}, false},
-		{"yes, no defaultValue", []string{"-f1", ""}, true},
-		{"yes, other value", []string{"-f1", "v11"}, true},
-	}
-	for _, check := range checks {
-		t.Run(check.name, func(t *testing.T) {
-			fs := flag.NewFlagSet("test", flag.ContinueOnError)
-			fs.String(name, "v1", "")
-			fs.String("f2", "v2", "")
-			if err := fs.Parse(check.args); err != nil {
-				t.Fatalf("failed parsing: %v", err)
-			}
-			actual := isFlagPassed(fs, name)
-			if actual != check.expected {
-				t.Errorf("got %t, expected %t", actual, check.expected)
-			}
-		})
-	}
-}
-
-func TestGetVerboseWriter(t *testing.T) {
-	checks := [...]struct {
-		name         string
-		quiet        quietValue
-		expectedType string
-	}{
-		{"true", true, "io.discard"},
-		{"false", false, "*os.File"},
-	}
-	for _, check := range checks {
-		t.Run(check.name, func(t *testing.T) {
-			actual := getVerboseWriter(check.quiet)
-			actualType := fmt.Sprintf("%T", actual)
-			if actualType != check.expectedType {
-				t.Errorf("Expected %s, got %s", actualType, check.expectedType)
-			}
-		})
-	}
-}
diff --git a/output/output.go b/output/output.go
index 6b6942d..be266ed 100644
--- a/output/output.go
+++ b/output/output.go
@@ -50,11 +50,14 @@ func compileTemplates() (*template.Template, error) {
 }
 
 // Text outputs statistics in text format for CLI usage.
-func Text(w io.Writer, cs *stats.CacheStats) {
+func Text(w io.Writer, cs *stats.CacheStats) error {
 	if cs == nil {
-		panic(errors.New("unexpected nil stats"))
+		return errors.New("unexpected nil stats")
+	}
+	tpl, err := compileTemplates()
+	if err != nil {
+		return err
 	}
-	tpl, _ := compileTemplates()
 
 	const binsHeader = "Bin"
 	const keysHeader = "Keys"
@@ -71,9 +74,9 @@ func Text(w io.Writer, cs *stats.CacheStats) {
 		SizeLen:    int(math.Max(float64(cs.TotalSizeLength()), float64(len(sizeHeader)))),
 	}
 
-	err := tpl.Execute(w, data)
+	err = tpl.Execute(w, data)
 	if err != nil {
-		// No failure expected for any data, so let's panic.
-		panic(err)
+		return err
 	}
+	return nil
 }
diff --git a/output/output_test.go b/output/output_test.go
index cac2619..9535f64 100644
--- a/output/output_test.go
+++ b/output/output_test.go
@@ -68,27 +68,15 @@ func TestTextSadNil(t *testing.T) {
 	w := strings.Builder{}
 	var s *stats.CacheStats
 
-	recovered := func() (r bool) {
-		defer func() {
-			if panicked := recover(); panicked != nil {
-				r = true
-			}
-		}()
-		output.Text(&w, s)
-		return r
-	}
-	if !recovered() {
-		t.Errorf("test did not panic on nil stats")
+	if err :=output.Text(&w, s); err == nil {
+		t.Errorf("test did not error on nil stats")
 	}
 }
 
 func TestTextSadWriter(t *testing.T) {
-	defer func() {
-		if err := recover(); err == nil {
-			t.Error("calling Text() did not cause panic")
-		}
-	}()
-	output.Text(ErrorWriter(0), &stats.CacheStats{})
+	if err := output.Text(ErrorWriter(0), &stats.CacheStats{}); err == nil {
+		t.Error("unexpected success")
+	}
 }
 
 func TestText(t *testing.T) {
diff --git a/redis.go b/redis.go
deleted file mode 100644
index 4026e52..0000000
--- a/redis.go
+++ /dev/null
@@ -1,45 +0,0 @@
-package main
-
-import (
-	"flag"
-	"fmt"
-
-	"github.com/gomodule/redigo/redis"
-)
-
-// AuthConn is a redis.Conn which is is automatically authenticated if needed.
-type AuthConn struct {
-	redis.Conn
-}
-
-// newAuthConn authenticates the passed redis.Conn if needed.
-func newAuthConn(baseConn redis.Conn, fs *flag.FlagSet, user userValue, pass passValue) (*AuthConn, error) {
-	ac := AuthConn{Conn: baseConn}
-	var err error
-
-	if user != "" || pass != "" {
-		if err = authenticate(ac, isFlagPassed(fs, "user"), user, pass); err != nil {
-			return nil, err
-		}
-	}
-	return &ac, err
-}
-
-func newBaseConn(dsn dsnValue) (redis.Conn, error) {
-	return redis.DialURL(string(dsn))
-}
-
-func authenticate(c redis.Conn, includeUser bool, user userValue, pass passValue) error {
-	var err error
-
-	if includeUser {
-		_, err = c.Do("AUTH", user, pass)
-	} else {
-		_, err = c.Do("AUTH", pass)
-	}
-	if err != nil {
-		return fmt.Errorf("failed AUTH: %w", err)
-	}
-
-	return nil
-}
diff --git a/redis/redis.go b/redis/redis.go
new file mode 100644
index 0000000..3945901
--- /dev/null
+++ b/redis/redis.go
@@ -0,0 +1,47 @@
+package redis
+
+import (
+	"fmt"
+
+	"github.com/gomodule/redigo/redis"
+	"github.com/spf13/pflag"
+)
+
+// AuthConn is a redis.Conn which is is automatically authenticated if needed.
+type AuthConn struct {
+	redis.Conn
+}
+
+// NewAuthConn authenticates the passed redis.Conn if needed.
+func NewAuthConn(baseConn redis.Conn, fs *pflag.FlagSet, user UserValue, pass PassValue) (*AuthConn, error) {
+	ac := AuthConn{Conn: baseConn}
+	var err error
+
+	if user != "" || pass != "" {
+		if err = Authenticate(ac, IsFlagPassed(fs, "user"), user, pass); err != nil {
+			return nil, err
+		}
+	}
+	return &ac, err
+}
+
+// NewBaseConn provides a standard Redis connection.
+func NewBaseConn(dsn DSNValue) (redis.Conn, error) {
+	return redis.DialURL(string(dsn))
+}
+
+// Authenticate attempts authentication on an already opened standard Redis connection.
+func Authenticate(c redis.Conn, includeUser bool, user UserValue, pass PassValue) error {
+	var err error
+
+	if includeUser {
+		_, err = c.Do("AUTH", user, pass)
+	} else {
+		_, err = c.Do("AUTH", pass)
+	}
+	if err != nil {
+		return fmt.Errorf("failed AUTH: %w", err)
+	}
+
+	return nil
+}
diff --git a/redis/redis_test.go b/redis/redis_test.go
new file mode 100644
index 0000000..0539397
--- /dev/null
+++ b/redis/redis_test.go
@@ -0,0 +1,39 @@
+package redis_test
+
+import (
+	"testing"
+
+	"github.com/spf13/pflag"
+
+	"github.com/fgm/drupal_redis_stats/redis"
+)
+
+func TestIsFlagPassed(t *testing.T) {
+	const name = "f1"
+
+	checks := [...]struct {
+		name     string
+		args     []string
+		expected bool
+	}{
+		{"no, nil", nil, false},
+		{"no, no flags", []string{}, false},
+		{"no, other flags", []string{"--f2", "v2"}, false},
+		{"yes, no defaultValue", []string{"--f1", ""}, true},
+		{"yes, other value", []string{"--f1", "v11"}, true},
+	}
+	for _, check := range checks {
+		t.Run(check.name, func(t *testing.T) {
+			fs := pflag.NewFlagSet("test", pflag.ContinueOnError)
+			fs.StringP(name, "", "v1", "")
+			fs.StringP("f2", "", "v2", "")
+			if err := fs.Parse(check.args); err != nil {
+				t.Fatalf("failed parsing: %v", err)
+			}
+			actual := redis.IsFlagPassed(fs, name)
+			if actual != check.expected {
+				t.Errorf("got %t, expected %t", actual, check.expected)
+			}
+		})
+	}
+}
diff --git a/redis/types.go b/redis/types.go
new file mode 100644
index 0000000..5d38591
--- /dev/null
+++ b/redis/types.go
@@ -0,0 +1,84 @@
+package redis
+
+import (
+	"strconv"
+
+	"github.com/spf13/pflag"
+)
+
+type (
+	// DSNValue is a wire-compatible string for DSN flags
+	DSNValue string
+	// JSONValue is a wire-compatible boolean for jsonOutput
+	JSONValue bool
+	// PassValue is a wire-compatible string for passwords
+	PassValue string
+	// QuietValue is a wire-compatible boolean for quiet
+	QuietValue bool
+	// UserValue is a wire-compatible string for user names
+	UserValue string
+)
+
+// String is part of the pflag.Value implementation
+func (d *DSNValue) String() string { return string(*d) }
+
+// Set is part of the pflag.Value implementation
+func (d *DSNValue) Set(s string) error { *d = DSNValue(s); return nil }
+
+// Type is part of the pflag.Value implementation
+func (d *DSNValue) Type() string { return "string" }
+
+// String is part of the pflag.Value implementation
+func (d *PassValue) String() string { return string(*d) }
+
+// Set is part of the pflag.Value implementation
+func (d *PassValue) Set(s string) error { *d = PassValue(s); return nil }
+
+// Type is part of the pflag.Value implementation
+func (d *PassValue) Type() string { return "string" }
+
+// String is part of the pflag.Value implementation
+func (d *UserValue) String() string { return string(*d) }
+
+// Set is part of the pflag.Value implementation
+func (d *UserValue) Set(s string) error { *d = UserValue(s); return nil }
+
+// Type is part of the pflag.Value implementation
+func (d *UserValue) Type() string { return "string" }
+
+// String is part of the pflag.Value implementation
+func (d *JSONValue) String() string { return strconv.FormatBool(bool(*d)) }
+
+// Set is part of the pflag.Value implementation
+func (d *JSONValue) Set(s string) error {
+	b, err := strconv.ParseBool(s)
+	*d = JSONValue(b)
+	return err
+}
+
+// Type is part of the pflag.Value implementation
+func (d *JSONValue) Type() string { return "bool" }
+
+// String is part of the pflag.Value implementation
+func (d *QuietValue) String() string { return strconv.FormatBool(bool(*d)) }
+
+// Set is part of the pflag.Value implementation
+func (d *QuietValue) Set(s string) error {
+	b, err := strconv.ParseBool(s)
+	*d = QuietValue(b)
+	return err
+}
+
+// Type is part of the pflag.Value implementation
+func (d *QuietValue) Type() string { return "bool" }
+
+// IsFlagPassed reports whether or not a named flag has been passed.
+func IsFlagPassed(fs *pflag.FlagSet, name string) bool {
+	found := false
+	fs.Visit(func(f *pflag.Flag) {
+		if f.Name == name {
+			found = true
+		}
+	})
+	return found
+}
diff --git a/redis/types_test.go b/redis/types_test.go
new file mode 100644
index 0000000..82e667d
--- /dev/null
+++ b/redis/types_test.go
@@ -0,0 +1,47 @@
+package redis_test
+
+import (
+	"testing"
+
+	"github.com/fgm/drupal_redis_stats/redis"
+)
+
+func TestDSNValue(t *testing.T) {
+	var v redis.DSNValue
+	v.Set(v.Type())
+	if v.String() != "string" {
+		t.Errorf("Expected string got %s", v.String())
+	}
+}
+
+func TestJSONValue(t *testing.T) {
+	var v redis.JSONValue
+	v.Set(v.Type())
+	if v.String() != "false" { // "bool" is not trueish
+		t.Errorf("Expected false got %s", v.String())
+	}
+}
+
+func TestPassValue(t *testing.T) {
+	var v redis.PassValue
+	v.Set(v.Type())
+	if v.String() != "string" {
+		t.Errorf("Expected string got %s", v.String())
+	}
+}
+
+func TestQuietValue(t *testing.T) {
+	var v redis.QuietValue
+	v.Set(v.Type())
+	if v.String() != "false" { // "bool" is not trueish
+		t.Errorf("Expected string got %s", v.String())
+	}
+}
+
+func TestUserValue(t *testing.T) {
+	var v redis.UserValue
+	v.Set(v.Type())
+	if v.String() != "string" {
+		t.Errorf("Expected string got %s", v.String())
+	}
+}
diff --git a/stats/scanner.go b/stats/scanner.go
new file mode 100644
index 0000000..5553a99
--- /dev/null
+++ b/stats/scanner.go
@@ -0,0 +1,98 @@
+package stats
+
+import (
+	"fmt"
+	"io"
+	"regexp"
+
+	"github.com/gomodule/redigo/redis"
+
+	redis2 "github.com/fgm/drupal_redis_stats/redis"
+	"github.com/fgm/drupal_redis_stats/stats/progress"
+)
+
+// NewScanner builds a Scanner
+func NewScanner(conn *redis2.AuthConn) Scanner {
+	return &RealScanner{Conn: conn}
+}
+
+// RealScanner is a concrete Scanner implementation.
+type RealScanner struct {
+	redis.Conn
+	*CacheStats
+}
+
+// Scanner describes a service providing statistics for Drupal cache bins in Redis.
+type Scanner interface {
+	Scan(w io.Writer, maxPasses uint32) (*CacheStats, error)
+	io.Closer
+}
+
+/*
+Scan examines the active database for keys matching the Drupal cache bin format.
+
+  - c is the established connection to Redis on which to perform the Scan.
+  - maxPasses allows limiting the number of Redis SCAN steps. Use 0 for no limit.
+  - writer is a logging output (think os.Stderr), not the main output.
+*/
+func (s *RealScanner) Scan(w io.Writer, maxPasses uint32) (*CacheStats, error) {
+	s.CacheStats = &CacheStats{
+		Stats: map[string]BinStats{},
+	}
+
+	dbSize, err := redis.Uint64(s.Do("DBSIZE"))
+	if err != nil {
+		return nil, err
+	}
+	s.TotalKeys = uint32(dbSize) // Cannot be >= 2^32 in Redis anyway.
+	pb := progress.MakeProgressBar(80, s.TotalKeys)
+	var passes uint32 // The number of performed SCAN passes.
+	var seen float64
+	var iterator int  // Type chosen by Redigo
+	var keys []string // The keys returned by a single SCAN pass.
+	for {
+		passes++
+		// Run one Scan pass with the current iterator position.
+		arr, err := redis.Values(s.Do("SCAN", iterator, "MATCH", "drupal.redis.*"))
+		if err != nil {
+			return nil, err
+		}
+		// Parse Scan pass results.
+		iterator, _ = redis.Int(arr[0], nil)
+		keys, _ = redis.Strings(arr[1], nil)
+		seen += float64(len(keys))
+		_, _ = fmt.Fprint(w, pb.Render(seen))
+		err = s.indexKeys(keys)
+		if err != nil {
+			return nil, err
+		}
+		// When iteration is done, the returned iterator will be 0.
+		if iterator == 0 || (maxPasses != 0 && passes >= maxPasses) {
+			break
+		}
+	}
+	_, _ = fmt.Fprint(w, pb.Remove())
+	return s.CacheStats, nil
+}
+
+// indexKeys assumes cs.Stats is already initialized to a non-nil value.
+func (s *RealScanner) indexKeys(keys []string) error {
+	const reString = `drupal\.redis\.[-.\d\w]+:([\w]+):(.*)`
+
+	var re = regexp.MustCompile(reString)
+
+	for _, key := range keys {
+		sl := re.FindStringSubmatch(key)
+		if sl == nil {
+			return fmt.Errorf("unexpected non-matching key: %s", key)
+		}
+		bin := sl[1]
+		if _, ok := s.Stats[bin]; !ok {
+			s.Stats[bin] = BinStats{}
+		}
+		binStats := s.Stats[bin]
+		binStats.addEntry(s.Conn, key)
+		s.Stats[bin] = binStats
+	}
+	return nil
+}
diff --git a/stats/stats.go b/stats/stats.go
index 2d67112..350e9a8 100644
--- a/stats/stats.go
+++ b/stats/stats.go
@@ -5,13 +5,9 @@ package stats
 
 import (
 	"fmt"
-	"io"
-	"regexp"
 	"strconv"
 
 	"github.com/gomodule/redigo/redis"
-
-	"github.com/fgm/drupal_redis_stats/stats/progress"
 )
 
 /*
@@ -49,28 +45,6 @@ type CacheStats struct {
 	Stats     map[string]BinStats
 }
 
-// indexKeys assumes cs.Stats is already initialized to a non-nil value.
-func (cs *CacheStats) indexKeys(c redis.Conn, keys []string) error {
-	const reString = `drupal\.redis\.[-.\d\w]+:([\w]+):(.*)`
-
-	var re = regexp.MustCompile(reString)
-
-	for _, key := range keys {
-		sl := re.FindStringSubmatch(key)
-		if sl == nil {
-			return fmt.Errorf("unexpected non-matching key: %s", key)
-		}
-		bin := sl[1]
-		if _, ok := cs.Stats[bin]; !ok {
-			cs.Stats[bin] = BinStats{}
-		}
-		binStats := cs.Stats[bin]
-		binStats.addEntry(c, key)
-		cs.Stats[bin] = binStats
-	}
-	return nil
-}
-
 /*
 MaxBinNameLength returns the length in runes of the longest bin name.
 */
@@ -85,53 +59,6 @@ func (cs CacheStats) MaxBinNameLength() int {
 	return max
 }
 
-/*
-Scan examines the active database for keys matching the Drupal cache bin format.
-
-  - c is the established connection to Redis on which to perform the Scan.
-  - maxPasses allows limiting the number of Redis SCAN steps. Use 0 for no limit.
-  - writer is a logging output (think os.Stderr), not the main output.
-*/
-func (cs *CacheStats) Scan(c redis.Conn, maxPasses uint32, w io.Writer) error {
-	if cs.Stats == nil {
-		cs.Stats = map[string]BinStats{}
-	}
-
-	dbSize, err := redis.Uint64(c.Do("DBSIZE"))
-	if err != nil {
-		return err
-	}
-	cs.TotalKeys = uint32(dbSize) // Cannot be >= 2^32 in Redis anyway.
-	pb := progress.MakeProgressBar(80, cs.TotalKeys)
-	var passes uint32 // The number of performed SCAN passes.
-	var seen float64
-	var iterator int  // Type chosen by Redigo
-	var keys []string // The keys returned by a single SCAN pass.
-	for {
-		passes++
-		// Run one Scan pass with the current iterator position.
-		arr, err := redis.Values(c.Do("SCAN", iterator, "MATCH", "drupal.redis.*"))
-		if err != nil {
-			return err
-		}
-		// Parse Scan pass results.
-		iterator, _ = redis.Int(arr[0], nil)
-		keys, _ = redis.Strings(arr[1], nil)
-		seen += float64(len(keys))
-		_, _ = fmt.Fprint(w, pb.Render(seen))
-		err = cs.indexKeys(c, keys)
-		if err != nil {
-			return err
-		}
-		// When iteration is done, the returned iterator will be 0.
-		if iterator == 0 || (maxPasses != 0 && passes >= maxPasses) {
-			break
-		}
-	}
-	_, _ = fmt.Fprint(w, pb.Remove())
-	return nil
-}
-
 /*
 ItemCountLength returns the length in runes of the total number of keys.
 
diff --git a/wire.go b/wire.go
deleted file mode 100644
index 75e32d3..0000000
--- a/wire.go
+++ /dev/null
@@ -1,14 +0,0 @@
-//+build wireinject
-
-package main
-
-import (
-	"flag"
-
-	"github.com/google/wire"
-)
-
-func wireAuthConn(fs *flag.FlagSet, dsn dsnValue, user userValue, pass passValue) (*AuthConn, error) {
-	wire.Build(newAuthConn, newBaseConn)
-	return &AuthConn{}, nil
-}
diff --git a/wire_gen.go b/wire_gen.go
deleted file mode 100644
index cd26103..0000000
--- a/wire_gen.go
+++ /dev/null
@@ -1,24 +0,0 @@
-// Code generated by Wire. DO NOT EDIT.
-
-//go:generate go run github.com/google/wire/cmd/wire
-//+build !wireinject
-
-package main
-
-import (
-	"flag"
-)
-
-// Injectors from wire.go:
-
-func wireAuthConn(fs *flag.FlagSet, dsn dsnValue, user userValue, pass passValue) (*AuthConn, error) {
-	conn, err := newBaseConn(dsn)
-	if err != nil {
-		return nil, err
-	}
-	authConn, err := newAuthConn(conn, fs, user, pass)
-	if err != nil {
-		return nil, err
-	}
-	return authConn, nil
-}

From 4a9c89c3948c21db4d5fd66c044416bb46ed58ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20G=2E=20MARAND?= <fgm@osinet.fr>
Date: Sun, 18 Feb 2024 12:18:32 +0100
Subject: [PATCH 3/3] 2024 NY updates.

---
 go.mod |  34 ++---
 go.sum | 402 +++++++++++++++------------------------------------------
 2 files changed, 124 insertions(+), 312 deletions(-)

diff --git a/go.mod b/go.mod
index 7a7436f..4a8bcac 100644
--- a/go.mod
+++ b/go.mod
@@ -4,28 +4,32 @@ go 1.22
 
 require (
 	github.com/gomodule/redigo v1.8.9
-	github.com/google/wire v0.5.0
+	github.com/google/wire v0.6.0
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/morikuni/aec v1.0.0
-	github.com/spf13/cobra v1.1.3
+	github.com/spf13/cobra v1.8.0
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.7.0
+	github.com/spf13/viper v1.18.2
 	golang.org/x/term v0.17.0
 )
 
 require (
-	github.com/fsnotify/fsnotify v1.4.7 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/magiconair/properties v1.8.1 // indirect
-	github.com/mitchellh/mapstructure v1.1.2 // indirect
-	github.com/pelletier/go-toml v1.2.0 // indirect
-	github.com/spf13/afero v1.1.2 // indirect
-	github.com/spf13/cast v1.3.0 // indirect
-	github.com/spf13/jwalterweatherman v1.0.0 // indirect
-	github.com/subosito/gotenv v1.2.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.1.1 // indirect
+	github.com/sagikazarmark/locafero v0.4.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/exp v0.0.0-20240213143201-ec583247a57a // indirect
 	golang.org/x/sys v0.17.0 // indirect
-	golang.org/x/text v0.3.2 // indirect
-	gopkg.in/ini.v1 v1.51.0 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 0521a9c..3915820 100644
--- a/go.sum
+++ b/go.sum
@@ -1,326 +1,134 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
-github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
-github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
-github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
-github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
-github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
-github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
-github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
-github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
-github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
-github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
-github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
-github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
-github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
-github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
-github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
-github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
-github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
-github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
-github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
-github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
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 github.com/gomodule/redigo v1.8.9/go.mod h1:7ArFNvsTjH8GMMzB4uy1snslv2BwmginuMs06a1uzZE=
-github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
-github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
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-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
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-github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
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-github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
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 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
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-github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
-github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I=
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