internal/xgettext, cmd/xgettext-go: add an xgettext-go command

cmd/xgettext-go/main.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"bytes"
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/jessevdk/go-flags"
+
+	"github.com/snapcore/go-gettext/internal/xgettext"
+)
+
+var formatTime = func() string {
+	return time.Now().Format("2006-01-02 15:04-0700")
+}
+
+type options struct {
+	FilesFrom string `short:"f" long:"files-from" value-name:"FILE" description:"get list of input files from FILE"`
+
+	Directories []string `short:"D" long:"directory" value-name:"DIRECTORY" description:"add DIRECTORY to list for input files search"`
+
+	Output string `short:"o" long:"output" value-name:"FILE" description:"output to specified file"`
+
+	CommentTags []string `short:"c" long:"add-comments" optional:"true" optional-value:"" value-name:"TAG" description:"place all comment blocks preceding keyword lines in output file"`
+
+	Keywords []string `short:"k" long:"keyword" optional:"true" optional-value:"" value-name:"WORD" description:"look for WORD as the keyword for singular strings"`
+
+	NoLocation bool `long:"no-location" description:"do not write '#: filename:line' lines"`
+
+	SortOutput bool `short:"s" long:"sort-output" description:"generate sorted output"`
+
+	PackageName string `long:"package-name" value-name:"PACKAGE" description:"set package name in output"`
+
+	MsgidBugsAddress string `long:"msgid-bugs-address" default:"EMAIL" value-name:"ADDRESS" description:"set report address for msgid bugs"`
+}
+
+func main() {
+	// parse args
+	var opts options
+	args, err := flags.ParseArgs(&opts, os.Args)
+	if err != nil {
+		if flagsErr, ok := err.(*flags.Error); ok && flagsErr.Type == flags.ErrHelp {
+			os.Exit(0)
+		}
+		os.Exit(1)
+	}
+
+	var files []string
+	if opts.FilesFrom != "" {
+		content, err := ioutil.ReadFile(opts.FilesFrom)
+		if err != nil {
+			log.Fatalf("cannot read file %v: %v", opts.FilesFrom, err)
+		}
+		content = bytes.TrimSpace(content)
+		files = strings.Split(string(content), "\n")
+	} else {
+		files = args[1:]
+	}
+
+	extractor := xgettext.Extractor{
+		Directories:      opts.Directories,
+		CommentTags:      opts.CommentTags,
+		SortOutput:       opts.SortOutput,
+		NoLocation:       opts.NoLocation,
+		PackageName:      opts.PackageName,
+		MsgidBugsAddress: opts.MsgidBugsAddress,
+		CreationDate:     formatTime(),
+	}
+	log.Printf("keywords: %#v", opts.Keywords)
+	addDefaultKeywords := true
+	for _, spec := range opts.Keywords {
+		if spec == "" {
+			// a bare "-k" option disables the default keywords
+			addDefaultKeywords = false
+			continue
+		}
+		kw, err := xgettext.ParseKeyword(spec)
+		if err != nil {
+			log.Fatalf("cannot parse keyword %s: %s", spec, err)
+		}
+		extractor.Keywords = append(extractor.Keywords, kw)
+	}
+	if addDefaultKeywords {
+		extractor.AddDefaultKeywords()
+	}
+
+	for _, filename := range files {
+		if err := extractor.ParseFile(filename); err != nil {
+			log.Fatalf("cannot parse file %s: %s", filename, err)
+		}
+	}
+
+	out := os.Stdout
+	if opts.Output != "" {
+		var err error
+		out, err = os.Create(opts.Output)
+		if err != nil {
+			log.Fatalf("failed to create %s: %s", opts.Output, err)
+		}
+	}
+	if err := extractor.Write(out); err != nil {
+		log.Fatalf("failed to write po template: %s", err)
+	}
+}

go.mod

@@ -1,3 +1,14 @@
 module github.com/snapcore/go-gettext
 
 go 1.18
+
+require (
+	github.com/jessevdk/go-flags v1.4.0
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c
+)
+
+require (
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/rogpeppe/go-internal v1.12.0 // indirect
+)

go.sum

@@ -0,0 +1,16 @@
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/jessevdk/go-flags v1.4.0 h1:4IU2WS7AumrZ/40jfhf4QVDMsQwqA7VEHozFRrGARJA=
+github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
+github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
+github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
+github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=