Merge pull request 'Update workflows' (#81) from atolstikhin/micro-config-flag:v3 into v3

Reviewed-on: #81

.gitea/workflows/job_lint.yml

@@ -0,0 +1,29 @@
+name: lint
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+    - master
+    - v3
+    - v4
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable' 
+    - name: setup deps
+      run: go get -v ./...
+    - name: run lint
+      uses: https://github.com/golangci/golangci-lint-action@v6
+      with:
+        version: 'latest'

.gitea/workflows/job_test.yml

@@ -0,0 +1,34 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+    - master
+    - v3
+    - v4
+  push:
+    branches:
+    - master
+    - v3
+    - v4
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup deps
+      run: go get -v ./...
+    - name: run test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...

.gitea/workflows/job_tests.yml

@@ -0,0 +1,53 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+    - master
+    - v3
+    - v4
+  push:
+    branches:
+    - master
+    - v3
+    - v4
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: checkout tests
+      uses: actions/checkout@v4
+      with:
+        ref: master
+        filter: 'blob:none'
+        repository: unistack-org/micro-tests
+        path: micro-tests
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup go work
+      env:
+        GOWORK: /workspace/${{ github.repository_owner }}/go.work
+      run: |
+        go work init
+        go work use .
+        go work use micro-tests        
+    - name: setup deps
+      env:
+        GOWORK: /workspace/${{ github.repository_owner }}/go.work
+      run: go get -v ./...
+    - name: run tests
+      env:
+        INTEGRATION_TESTS: yes
+        GOWORK: /workspace/${{ github.repository_owner }}/go.work
+      run: |
+        cd micro-tests
+        go test -mod readonly -v ./... || true        

.github/dependabot.yml

@@ -1,19 +0,0 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-
-version: 2
-updates:
-
-  # Maintain dependencies for GitHub Actions
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"
-
-  # Maintain dependencies for Golang
-  - package-ecosystem: "gomod"
-    directory: "/"
-    schedule:
-      interval: "daily"

.github/workflows/autoapprove.yml

@@ -1,20 +0,0 @@
-name: "autoapprove"
-
-on:
-  pull_request_target:
-    types: [assigned, opened, synchronize, reopened]
-
-permissions:
-  pull-requests: write
-  contents: write
-
-jobs:
-  autoapprove:
-    runs-on: ubuntu-latest
-    steps:
-      - name: approve
-        uses: hmarr/auto-approve-action@v2
-        if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
-        id: approve
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/automerge.yml

@@ -1,21 +0,0 @@
-name: "automerge"
-
-on:
-  pull_request_target:
-    types: [assigned, opened, synchronize, reopened]
-
-permissions:
-  pull-requests: write
-  contents: write
-
-jobs:
-  automerge:
-    runs-on: ubuntu-latest
-    if: github.actor == 'vtolstov'
-    steps:
-      - name: merge
-        id: merge
-        run: gh pr merge --auto --merge "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/build.yml

@@ -1,47 +0,0 @@
-name: build
-on:
- push:
-    branches:
-    - master
-    - v3
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.17
-    - name: checkout
-      uses: actions/checkout@v3
-    - name: cache
-      uses: actions/cache@v3
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - name: deps
-      run: go get -v -t -d ./...
-    - name: test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout
-        uses: actions/checkout@v3
-      - name: lint
-        uses: golangci/golangci-lint-action@v3.1.0
-        continue-on-error: true
-        with:
-          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.github/workflows/codeql-analysis.yml

@@ -1,78 +0,0 @@
-# For most projects, this workflow file will not need changing; you simply need
-# to commit it to your repository.
-#
-# You may wish to alter this file to override the set of languages analyzed,
-# or to provide custom queries or build logic.
-#
-# ******** NOTE ********
-# We have attempted to detect the languages in your repository. Please check
-# the `language` matrix defined below to confirm you have the correct set of
-# supported CodeQL languages.
-#
-name: "codeql"
-
-on:
-  workflow_run:
-    workflows: ["prbuild"]
-    types:
-      - completed
-  push:
-    branches: [ master, v3 ]
-  pull_request:
-    # The branches below must be a subset of the branches above
-    branches: [ master, v3 ]
-  schedule:
-    - cron: '34 1 * * 0'
-
-jobs:
-  analyze:
-    name: analyze
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read
-      contents: read
-      security-events: write
-
-    strategy:
-      fail-fast: false
-      matrix:
-        language: [ 'go' ]
-        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
-        # Learn more:
-        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
-
-    steps:
-    - name: checkout
-      uses: actions/checkout@v3
-    - name: setup
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.17
-    # Initializes the CodeQL tools for scanning.
-    - name: init
-      uses: github/codeql-action/init@v1
-      with:
-        languages: ${{ matrix.language }}
-        # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file.
-        # Prefix the list here with "+" to use these queries and those in the config file.
-        # queries: ./path/to/local/query, your-org/your-repo/queries@main
-
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
-    - name: autobuild
-      uses: github/codeql-action/autobuild@v1
-
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 https://git.io/JvXDl
-
-    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
-    #    and modify them (or add more) to build your code if your project
-    #    uses a compiled language
-
-    #- run: |
-    #   make bootstrap
-    #   make release
-
-    - name: analyze
-      uses: github/codeql-action/analyze@v1

.github/workflows/dependabot-automerge.yml

@@ -1,27 +0,0 @@
-name: "dependabot-automerge"
-
-on:
-  pull_request_target:
-    types: [assigned, opened, synchronize, reopened]
-
-permissions:
-  pull-requests: write
-  contents: write
-
-jobs:
-  automerge:
-    runs-on: ubuntu-latest
-    if: github.actor == 'dependabot[bot]'
-    steps:
-      - name: metadata
-        id: metadata
-        uses: dependabot/fetch-metadata@v1.3.0
-        with:
-          github-token: "${{ secrets.TOKEN }}"
-      - name: merge
-        id: merge
-        if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
-        run: gh pr merge --auto --merge "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/pr.yml

@@ -1,47 +0,0 @@
-name: prbuild
-on:
-  pull_request:
-    branches:
-    - master
-    - v3
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.17
-    - name: checkout
-      uses: actions/checkout@v3
-    - name: cache
-      uses: actions/cache@v3
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - name: deps
-      run: go get -v -t -d ./...
-    - name: test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout
-        uses: actions/checkout@v3
-      - name: lint
-        uses: golangci/golangci-lint-action@v3.1.0
-        continue-on-error: true
-        with:
-          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.golangci.yml

@@ -0,0 +1,5 @@
+run:
+  concurrency: 8
+  deadline: 5m
+  issues-exit-code: 1
+  tests: true

flag.go

@@ -1,11 +1,13 @@
-package flag // import "go.unistack.org/micro-config-flag/v3"
+package flag
 
 import (
 	"context"
 	"errors"
 	"flag"
 	"fmt"
+	"os"
 	"reflect"
+	"strings"
 	"time"
 
 	"go.unistack.org/micro/v3/config"
@@ -27,7 +29,10 @@ var (
 */
 
 type flagConfig struct {
+	fset *flag.FlagSet
 	opts config.Options
+	name string
+	env  string
 }
 
 func (c *flagConfig) Options() config.Options {
@@ -39,17 +44,35 @@ func (c *flagConfig) Init(opts ...config.Option) error {
 		o(&c.opts)
 	}
 
+	if err := config.DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	c.configure()
+
 	fields, err := rutil.StructFields(c.opts.Struct)
 	if err != nil {
+		if !c.opts.AllowFail {
 			return err
 		}
 
+		if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
+
+		return nil
+	}
+
 	for _, sf := range fields {
 		tf, ok := sf.Field.Tag.Lookup(c.opts.StructTag)
 		if !ok {
 			continue
 		}
+
 		fn, fd, fv := getFlagOpts(tf)
+		if tf, ok = sf.Field.Tag.Lookup(c.env); ok {
+			fd += fmt.Sprintf(" (env %s)", tf)
+		}
 
 		rcheck := true
 
@@ -63,6 +86,7 @@ func (c *flagConfig) Init(opts ...config.Option) error {
 		if f := flag.Lookup(fn); f != nil {
 			return nil
 		}
+
 		switch vi.(type) {
 		case time.Duration:
 			err = c.flagDuration(sf.Value, fn, fv, fd)
@@ -73,10 +97,13 @@ func (c *flagConfig) Init(opts ...config.Option) error {
 		}
 
 		if err != nil {
-			c.opts.Logger.Errorf(c.opts.Context, "flag init error: %v", err)
 			if !c.opts.AllowFail {
 				return err
 			}
+			if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+				return err
+			}
+
 			return nil
 		}
 
@@ -109,26 +136,60 @@ func (c *flagConfig) Init(opts ...config.Option) error {
 			err = c.flagMap(sf.Value, fn, fv, fd)
 		}
 		if err != nil {
-			c.opts.Logger.Errorf(c.opts.Context, "flag init error: %v", err)
 			if !c.opts.AllowFail {
 				return err
 			}
+
+			if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+				return err
+			}
+
 			return nil
 		}
 	}
 
+	if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	return nil
 }
 
 func (c *flagConfig) Load(ctx context.Context, opts ...config.LoadOption) error {
+	if c.opts.SkipLoad != nil && c.opts.SkipLoad(ctx, c) {
+		return nil
+	}
+
 	options := config.NewLoadOptions(opts...)
 	_ = options
+
+	if err := config.DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	if err := config.DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	// TODO: allow merge, append and so
 	flag.Parse()
+
 	return nil
 }
 
 func (c *flagConfig) Save(ctx context.Context, opts ...config.SaveOption) error {
+	if c.opts.SkipSave != nil && c.opts.SkipSave(ctx, c) {
+		return nil
+	}
+
+	if err := config.DefaultBeforeSave(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	if err := config.DefaultAfterSave(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	return nil
 }
 
@@ -144,10 +205,125 @@ func (c *flagConfig) Watch(ctx context.Context, opts ...config.WatchOption) (con
 	return nil, fmt.Errorf("not implemented")
 }
 
+func (c *flagConfig) usage() {
+	mapDelim := DefaultMapDelim
+	sliceDelim := DefaultSliceDelim
+
+	if c.opts.Context != nil {
+		if d, ok := c.opts.Context.Value(mapDelimKey{}).(string); ok {
+			mapDelim = d
+		}
+		if d, ok := c.opts.Context.Value(sliceDelimKey{}).(string); ok {
+			sliceDelim = d
+		}
+	}
+
+	if c.name == "" {
+		fmt.Fprintf(c.fset.Output(), "Usage:\n")
+	} else {
+		fmt.Fprintf(c.fset.Output(), "Usage of %s:\n", c.name)
+	}
+
+	c.fset.VisitAll(func(f *flag.Flag) {
+		var b strings.Builder
+		fmt.Fprintf(&b, "  -%s", f.Name) // Two spaces before -; see next two comments.
+		_, usage := flag.UnquoteUsage(f)
+		name := "value"
+		v := reflect.TypeOf(f.Value).String()
+		b.WriteString(" ")
+		switch v {
+		case "*flag.boolFlag":
+			name = "bool"
+		case "*flag.durationValue":
+			name = "duration"
+		case "*flag.float64Value":
+			name = "float"
+		case "*flag.intValue", "*flag.int64Value":
+			name = "int"
+		case "*flag.stringValue":
+			name = "string"
+		case "*flag.uintValue", "*flag.uint64Value":
+			name = "uint"
+		case "*flag.mapValue":
+			//	nv := f.Value.(*mapValue)
+			name = fmt.Sprintf("string key=val with %q as separator", mapDelim)
+		case "*flag.sliceValue":
+			//	nv := f.Value.(*sliceValue)
+			name = fmt.Sprintf("string with %q as separator", sliceDelim)
+		}
+		b.WriteString(name)
+
+		// Boolean flags of one ASCII letter are so common we
+		// treat them specially, putting their usage on the same line.
+		if b.Len() <= 4 { // space, space, '-', 'x'.
+			b.WriteString("\t")
+		} else {
+			// Four spaces before the tab triggers good alignment
+			// for both 4- and 8-space tab stops.
+			b.WriteString("\n    \t")
+		}
+		b.WriteString(strings.ReplaceAll(usage, "\n", "\n    \t"))
+
+		if f.Value.String() == f.DefValue {
+			fmt.Fprintf(&b, " (default %q)", f.DefValue)
+		} else {
+			fmt.Fprintf(&b, " (default %q current %q)", f.DefValue, f.Value)
+		}
+
+		fmt.Fprint(c.fset.Output(), b.String(), "\n")
+	})
+}
+
+func (c *flagConfig) configure() {
+	flagSet := flag.CommandLine
+	flagSetName := os.Args[0]
+	flagSetErrorHandling := flag.ExitOnError
+	flagEnv := "env"
+	var flagUsage func()
+	var isSet bool
+
+	if c.opts.Context != nil {
+		if v, ok := c.opts.Context.Value(flagSetNameKey{}).(string); ok {
+			isSet = true
+			flagSetName = v
+		}
+		if v, ok := c.opts.Context.Value(flagSetErrorHandlingKey{}).(flag.ErrorHandling); ok {
+			isSet = true
+			flagSetErrorHandling = v
+		}
+		if v, ok := c.opts.Context.Value(flagSetKey{}).(*flag.FlagSet); ok {
+			flagSet = v
+		}
+		if v, ok := c.opts.Context.Value(flagSetUsageKey{}).(func()); ok {
+			flagUsage = v
+		}
+		if v, ok := c.opts.Context.Value(flagEnvKey{}).(string); ok {
+			flagEnv = v
+		}
+	}
+	c.fset = flagSet
+
+	if isSet {
+		c.fset.Init(flagSetName, flagSetErrorHandling)
+	}
+	if flagUsage != nil {
+		c.fset.Usage = flagUsage
+	} else {
+		c.fset.Usage = c.usage
+	}
+	c.env = flagEnv
+
+	c.name = flagSetName
+}
+
 func NewConfig(opts ...config.Option) config.Config {
 	options := config.NewOptions(opts...)
 	if len(options.StructTag) == 0 {
 		options.StructTag = DefaultStructTag
 	}
-	return &flagConfig{opts: options}
+
+	c := &flagConfig{opts: options}
+	c.configure()
+
+	return c
 }

flag_test.go

@@ -2,6 +2,7 @@ package flag
 
 import (
 	"context"
+	"flag"
 	"os"
 	"testing"
 	"time"
@@ -18,27 +19,29 @@ func TestLoad(t *testing.T) {
 	os.Args = append(os.Args, "-time", time.RFC822)
 	os.Args = append(os.Args, "-metadata", "key=20")
 	os.Args = append(os.Args, "-components", "all=info,api=debug")
+	os.Args = append(os.Args, "-addr", "33,44")
+	os.Args = append(os.Args, "-badflag", "test")
 	type NestedConfig struct {
 		Value string `flag:"name=nested_value"`
 	}
 	type Config struct {
-		Broker         string            `flag:"name=broker,desc='description with, comma',default='127.0.0.1:9092'"`
-		Verbose        bool              `flag:"name=verbose,desc='verbose output',default='false'"`
-		Addr           []string          `flag:"name=addr,desc='addrs',default='127.0.0.1:9092'"`
-		Wait           time.Duration     `flag:"name=wait,desc='wait time',default='2s'"`
 		Time           time.Time         `flag:"name=time,desc='some time',default='02 Jan 06 15:04 MST'"`
+		Components     map[string]string `flag:"name=components,desc='components logging'"`
 		Metadata       map[string]int    `flag:"name=metadata,desc='some meta',default=''"`
-		WithoutDefault string            `flag:"name=without_default,desc='with'"`
+		Nested         *NestedConfig
+		Broker         string        `flag:"name=broker,desc='description with, comma',default='127.0.0.1:9092'"`
 		WithoutDesc    string        `flag:"name=without_desc,default='without_default'"`
 		WithoutAll     string        `flag:"name=without_all"`
-		Components     map[string]string `flag:"name=components,desc='components logging'"`
+		WithoutDefault string        `flag:"name=without_default,desc='with'"`
-		Nested         *NestedConfig
+		Addr           []string      `flag:"name=addr,desc='addrs',default='127.0.0.1:9092'"`
+		Wait           time.Duration `flag:"name=wait,desc='wait time',default='2s'"`
+		Verbose        bool          `flag:"name=verbose,desc='verbose output',default='false'"`
 	}
 
 	ctx := context.Background()
 	cfg := &Config{Nested: &NestedConfig{}}
 
-	c := NewConfig(config.Struct(cfg), TimeFormat(time.RFC822))
+	c := NewConfig(config.Struct(cfg), TimeFormat(time.RFC822), FlagErrorHandling(flag.ContinueOnError))
 	if err := c.Init(); err != nil {
 		t.Fatalf("init failed: %v", err)
 	}

go.mod

@@ -1,5 +1,16 @@
 module go.unistack.org/micro-config-flag/v3
 
-go 1.16
+go 1.22
 
-require go.unistack.org/micro/v3 v3.9.1
+toolchain go1.23.1
+
+require go.unistack.org/micro/v3 v3.11.14
+
+require (
+	dario.cat/mergo v1.0.1 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	go.unistack.org/micro-proto/v3 v3.4.1 // indirect
+	google.golang.org/protobuf v1.35.2 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -1,159 +1,17 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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options.go

@@ -1,6 +1,8 @@
 package flag
 
 import (
+	"flag"
+
 	"go.unistack.org/micro/v3/config"
 )
 
@@ -24,3 +26,39 @@ type timeFormatKey struct{}
 func TimeFormat(s string) config.Option {
 	return config.SetOption(timeFormatKey{}, s)
 }
+
+type flagSetKey struct{}
+
+// FlagSet set flag set name
+func FlagSet(f *flag.FlagSet) config.Option {
+	return config.SetOption(flagSetKey{}, f)
+}
+
+type flagSetNameKey struct{}
+
+// FlagSetName set flag set name
+func FlagSetName(n string) config.Option {
+	return config.SetOption(flagSetNameKey{}, n)
+}
+
+type flagSetErrorHandlingKey struct{}
+
+// FlagErrorHandling set flag set error handling
+func FlagErrorHandling(eh flag.ErrorHandling) config.Option {
+	return config.SetOption(flagSetErrorHandlingKey{}, eh)
+}
+
+type flagSetUsageKey struct{}
+
+// FlagUsage set flag set usage func
+func FlagUsage(fn func()) config.Option {
+	return config.SetOption(flagSetUsageKey{}, fn)
+}
+
+
+type flagEnvKey struct{}
+
+// FlagEnv set flag set usage func
+func FlagEnv(n string) config.Option {
+	return config.SetOption(flagEnvKey{}, n)
+}

util.go

@@ -10,12 +10,12 @@ import (
 )
 
 type mapValue struct {
-	v     reflect.Value
 	delim string
 	def   string
+	v     reflect.Value
 }
 
-func (v mapValue) String() string {
+func (v *mapValue) String() string {
 	if v.v.Kind() != reflect.Invalid {
 		var kv []string
 		it := v.v.MapRange()
@@ -29,7 +29,11 @@ func (v mapValue) String() string {
 	return v.def
 }
 
-func (v mapValue) Set(s string) error {
+func (v *mapValue) Get() interface{} {
+	return v.v.Interface()
+}
+
+func (v *mapValue) Set(s string) error {
 	ps := strings.Split(s, v.delim)
 	if len(ps) == 0 {
 		return nil
@@ -67,12 +71,12 @@ func (v mapValue) Set(s string) error {
 }
 
 type sliceValue struct {
-	v     reflect.Value
 	delim string
 	def   string
+	v     reflect.Value
 }
 
-func (v sliceValue) String() string {
+func (v *sliceValue) String() string {
 	if v.v.Kind() != reflect.Invalid {
 		var kv []string
 		for idx := 0; idx < v.v.Len(); idx++ {
@@ -83,7 +87,11 @@ func (v sliceValue) String() string {
 	return v.def
 }
 
-func (v sliceValue) Set(s string) error {
+func (v *sliceValue) Get() interface{} {
+	return v.v.Interface()
+}
+
+func (v *sliceValue) Set(s string) error {
 	p := strings.Split(s, v.delim)
 	v.v.Set(reflect.MakeSlice(v.v.Type(), len(p), len(p)))
 	switch v.v.Type().Elem().Kind() {
@@ -317,6 +325,7 @@ func (c *flagConfig) flagFloat64(v reflect.Value, fn, fv, fd string) error {
 	return nil
 }
 
+/*
 func (c *flagConfig) flagStringSlice(v reflect.Value, fn, fv, fd string) error {
 	nv, ok := v.Addr().Interface().(*string)
 	if !ok {
@@ -325,6 +334,7 @@ func (c *flagConfig) flagStringSlice(v reflect.Value, fn, fv, fd string) error {
 	flag.StringVar(nv, fn, fv, fd)
 	return nil
 }
+*/
 
 func getFlagOpts(tf string) (string, string, string) {
 	var name, desc, def string