feat: Add --tag-filter-pattern flag.

This flag specifies a regular expression and only matched tags will
be included in change log.

Closes #43

.gitignore

@@ -10,6 +10,7 @@
 *.dll
 *.so
 *.dylib
+git-chglog
 
 # Test binary, build with `go test -c`
 *.test
@@ -31,6 +32,10 @@ Icon
 # Thumbnails
 ._*
 
+# Intellij IDEA
+*.iml
+.idea
+
 # Files that might appear in the root of a volume
 .DocumentRevisions-V100
 .fseventsd

README.md

@@ -166,15 +166,16 @@ USAGE:
     4. <name>       - Commit contained in <name>.
 
 OPTIONS:
-  --init                    generate the git-chglog configuration file in interactive
-  --config value, -c value  specifies a different configuration file to pick up (default: ".chglog/config.yml")
-  --output value, -o value  output path and filename for the changelogs. If not specified, output to stdout
-  --next-tag value          treat unreleased commits as specified tags (EXPERIMENTAL)
-  --silent                  disable stdout output
-  --no-color                disable color output [$NO_COLOR]
-  --no-emoji                disable emoji output [$NO_EMOJI]
-  --help, -h                show help
-  --version, -v             print the version
+  --init                                generate the git-chglog configuration file in interactive
+  --config value, -c value              specifies a different configuration file to pick up (default: ".chglog/config.yml")
+  --output value, -o value              output path and filename for the changelogs. If not specified, output to stdout
+  --next-tag value                      treat unreleased commits as specified tags (EXPERIMENTAL)
+  --silent                              disable stdout output
+  --no-color                            disable color output [$NO_COLOR]
+  --no-emoji                            disable emoji output [$NO_EMOJI]
+  --tag-filter-pattern value, -p value  regular expression of tag filter. Is specified, only matched tags will be picked
+  --help, -h                            show help
+  --version, -v                         print the version
 
 EXAMPLE:
 
@@ -512,7 +513,16 @@ See godoc [RenderData][doc-render-data] for available variables.
   This is a step that is necessary for project operation in many cases.
 </details>
 
-
+<details>
+  <summary>Can I generated CHANGELOG based on certain tags?</summary>
+
+  Yes, it can be solved by use the `--tag-filter-pattern` flag.
+
+  For example, the following command will only include tags starting with "v":
+  ```bash
+  $ git-chglog --tag-filter-pattern '^v'
+  ```
+</details>
 
 
 ## TODO

chglog.go

@@ -18,6 +18,7 @@ import (
 type Options struct {
 	Processor            Processor
 	NextTag              string              // Treat unreleased commits as specified tags (EXPERIMENTAL)
+	TagFilterPattern     string              // Filter tag by regexp
 	CommitFilters        map[string][]string // Filter by using `Commit` properties and values. Filtering is not done by specifying an empty value
 	CommitSortBy         string              // Property name to use for sorting `Commit` (e.g. `Scope`)
 	CommitGroupBy        string              // Property name of `Commit` to be grouped into `CommitGroup` (e.g. `Type`)
@@ -108,7 +109,7 @@ func NewGenerator(config *Config) *Generator {
 	return &Generator{
 		client:          client,
 		config:          config,
-		tagReader:       newTagReader(client),
+		tagReader:       newTagReader(client, config.Options.TagFilterPattern),
 		tagSelector:     newTagSelector(),
 		commitParser:    newCommitParser(client, config),
 		commitExtractor: newCommitExtractor(config.Options),

chglog_test.go

@@ -391,3 +391,64 @@ func TestGeneratorWithNextTag(t *testing.T) {
 [Unreleased]: /~https://github.com/git-chglog/git-chglog/compare/3.0.0...HEAD
 [3.0.0]: /~https://github.com/git-chglog/git-chglog/compare/2.0.0...3.0.0`, strings.TrimSpace(buf.String()))
 }
+
+func TestGeneratorWithTagFiler(t *testing.T) {
+	assert := assert.New(t)
+	testName := "type_scope_subject"
+
+	setup(testName, func(commit commitFunc, tag tagFunc, _ gitcmd.Client) {
+		commit("2018-01-01 00:00:00", "feat(core): version dev-1.0.0", "")
+		tag("dev-1.0.0")
+
+		commit("2018-02-01 00:00:00", "feat(core): version v1.0.0", "")
+		tag("v1.0.0")
+	})
+
+	gen := NewGenerator(&Config{
+		Bin:        "git",
+		WorkingDir: filepath.Join(testRepoRoot, testName),
+		Template:   filepath.Join(cwd, "testdata", testName+".md"),
+		Info: &Info{
+			Title:         "CHANGELOG Example",
+			RepositoryURL: "/~https://github.com/git-chglog/git-chglog",
+		},
+		Options: &Options{
+			TagFilterPattern: "^v",
+			CommitFilters: map[string][]string{
+				"Type": []string{
+					"feat",
+				},
+			},
+			CommitSortBy:      "Scope",
+			CommitGroupBy:     "Type",
+			CommitGroupSortBy: "Title",
+			CommitGroupTitleMaps: map[string]string{
+				"feat": "Features",
+			},
+			HeaderPattern: "^(\\w*)(?:\\(([\\w\\$\\.\\-\\*\\s]*)\\))?\\:\\s(.*)$",
+			HeaderPatternMaps: []string{
+				"Type",
+				"Scope",
+				"Subject",
+			},
+		},
+	})
+
+	buf := &bytes.Buffer{}
+	err := gen.Generate(buf, "")
+
+	assert.Nil(err)
+	assert.Equal(`<a name="unreleased"></a>
+## [Unreleased]
+
+
+<a name="v1.0.0"></a>
+## v1.0.0 - 2018-02-01
+### Features
+- **core:** version v1.0.0
+- **core:** version dev-1.0.0
+
+
+[Unreleased]: /~https://github.com/git-chglog/git-chglog/compare/v1.0.0...HEAD`, strings.TrimSpace(buf.String()))
+
+}

cmd/git-chglog/config.go

@@ -258,6 +258,7 @@ func (config *Config) Convert(ctx *CLIContext) *chglog.Config {
 		},
 		Options: &chglog.Options{
 			NextTag:              ctx.NextTag,
+			TagFilterPattern:     ctx.TagFilterPattern,
 			CommitFilters:        opts.Commits.Filters,
 			CommitSortBy:         opts.Commits.SortBy,
 			CommitGroupBy:        opts.CommitGroups.GroupBy,

cmd/git-chglog/context.go

@@ -6,16 +6,17 @@ import (
 
 // CLIContext ...
 type CLIContext struct {
-	WorkingDir string
-	Stdout     io.Writer
-	Stderr     io.Writer
-	ConfigPath string
-	OutputPath string
-	Silent     bool
-	NoColor    bool
-	NoEmoji    bool
-	Query      string
-	NextTag    string
+	WorkingDir       string
+	Stdout           io.Writer
+	Stderr           io.Writer
+	ConfigPath       string
+	OutputPath       string
+	Silent           bool
+	NoColor          bool
+	NoEmoji          bool
+	Query            string
+	NextTag          string
+	TagFilterPattern string
 }
 
 // InitContext ...

cmd/git-chglog/main.go

@@ -11,7 +11,7 @@ import (
 	"github.com/urfave/cli"
 )
 
-func main() {
+func CreateApp(actionFunc cli.ActionFunc) *cli.App {
 	ttl := color.New(color.FgYellow).SprintFunc()
 
 	cli.AppHelpTemplate = fmt.Sprintf(`
@@ -114,63 +114,77 @@ func main() {
 			EnvVar: "NO_EMOJI",
 		},
 
+		// tag-filter-pattern
+		cli.StringFlag{
+			Name:   "tag-filter-pattern, p",
+			Usage:  "Regular expression of tag filter. Is specified, only matched tags will be picked",
+		},
+
 		// help & version
 		cli.HelpFlag,
 		cli.VersionFlag,
 	}
 
-	app.Action = func(c *cli.Context) error {
-		wd, err := os.Getwd()
-		if err != nil {
-			fmt.Fprintln(os.Stderr, "failed to get working directory", err)
-			os.Exit(ExitCodeError)
-		}
-
-		// initializer
-		if c.Bool("init") {
-			initializer := NewInitializer(
-				&InitContext{
-					WorkingDir: wd,
-					Stdout:     colorable.NewColorableStdout(),
-					Stderr:     colorable.NewColorableStderr(),
-				},
-				fs,
-				NewQuestioner(
-					gitcmd.New(&gitcmd.Config{
-						Bin: "git",
-					}),
-					fs,
-				),
-				NewConfigBuilder(),
-				templateBuilderFactory,
-			)
-
-			os.Exit(initializer.Run())
-		}
-
-		// chglog
-		chglogCLI := NewCLI(
-			&CLIContext{
+	app.Action = actionFunc
+
+	return app
+}
+
+func AppAction(c *cli.Context) error {
+	wd, err := os.Getwd()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "failed to get working directory", err)
+		os.Exit(ExitCodeError)
+	}
+
+	// initializer
+	if c.Bool("init") {
+		initializer := NewInitializer(
+			&InitContext{
 				WorkingDir: wd,
 				Stdout:     colorable.NewColorableStdout(),
 				Stderr:     colorable.NewColorableStderr(),
-				ConfigPath: c.String("config"),
-				OutputPath: c.String("output"),
-				Silent:     c.Bool("silent"),
-				NoColor:    c.Bool("no-color"),
-				NoEmoji:    c.Bool("no-emoji"),
-				Query:      c.Args().First(),
-				NextTag:    c.String("next-tag"),
 			},
 			fs,
-			NewConfigLoader(),
-			NewGenerator(),
+			NewQuestioner(
+				gitcmd.New(&gitcmd.Config{
+					Bin: "git",
+				}),
+				fs,
+			),
+			NewConfigBuilder(),
+			templateBuilderFactory,
 		)
 
-		os.Exit(chglogCLI.Run())
-
-		return nil
+		os.Exit(initializer.Run())
 	}
 
+	// chglog
+	chglogCLI := NewCLI(
+		&CLIContext{
+			WorkingDir: wd,
+			Stdout:     colorable.NewColorableStdout(),
+			Stderr:     colorable.NewColorableStderr(),
+			ConfigPath: c.String("config"),
+			OutputPath: c.String("output"),
+			Silent:     c.Bool("silent"),
+			NoColor:    c.Bool("no-color"),
+			NoEmoji:    c.Bool("no-emoji"),
+			Query:      c.Args().First(),
+			NextTag:    c.String("next-tag"),
+			TagFilterPattern: c.String("tag-filter-pattern"),
+		},
+		fs,
+		NewConfigLoader(),
+		NewGenerator(),
+	)
+
+	os.Exit(chglogCLI.Run())
+
+	return nil
+}
+
+func main() {
+	app := CreateApp(AppAction)
 	app.Run(os.Args)
 }

cmd/git-chglog/main_test.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"github.com/stretchr/testify/assert"
+	"github.com/urfave/cli"
+	"testing"
+)
+
+var gAssert *assert.Assertions
+
+func mock_app_action(c *cli.Context) error {
+	assert := gAssert
+	assert.Equal("c.yml", c.String("config"))
+	assert.Equal("^v", c.String("tag-filter-pattern"))
+	assert.Equal("o.md", c.String("output"))
+	assert.Equal("v5", c.String("next-tag"))
+	assert.True(c.Bool("silent"))
+	assert.True(c.Bool("no-color"))
+	assert.True(c.Bool("no-emoji"))
+	return nil
+}
+
+func TestCreateApp(t *testing.T) {
+	assert := assert.New(t)
+	assert.True(true)
+	gAssert = assert
+
+	app := CreateApp(mock_app_action)
+	args := []string {
+		"git-chglog",
+		"--silent",
+		"--no-color",
+		"--no-emoji",
+		"--config", "c.yml",
+		"--output", "o.md",
+		"--next-tag", "v5",
+		"--tag-filter-pattern", "^v",
+	}
+	app.Run(args)
+}

tag_reader.go

@@ -2,6 +2,7 @@ package chglog
 
 import (
 	"fmt"
+	"regexp"
 	"sort"
 	"strings"
 	"time"
@@ -13,12 +14,14 @@ type tagReader struct {
 	client    gitcmd.Client
 	format    string
 	separator string
+	reFilter  *regexp.Regexp
 }
 
-func newTagReader(client gitcmd.Client) *tagReader {
+func newTagReader(client gitcmd.Client, filterPattern string) *tagReader {
 	return &tagReader{
 		client:    client,
 		separator: "@@__CHGLOG__@@",
+		reFilter:  regexp.MustCompile(filterPattern),
 	}
 }
 
@@ -56,6 +59,12 @@ func (r *tagReader) ReadAll() ([]*Tag, error) {
 			date = t
 		}
 
+		if r.reFilter != nil {
+			if !r.reFilter.MatchString(name) {
+				continue
+			}
+		}
+
 		tags = append(tags, &Tag{
 			Name:    name,
 			Subject: subject,