/
man.go
120 lines (105 loc) · 2.73 KB
/
man.go
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package cmd
import (
"compress/gzip"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"time"
"github.com/nao1215/gup/internal/print"
"github.com/spf13/cobra"
"github.com/spf13/cobra/doc"
)
func newManCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "man",
Short: "Generate man-pages under /usr/share/man/man1 (need root privilege)",
Long: `Generate man-pages under /usr/share/man/man1 (need root privilege)`,
Example: " sudo gup man",
Args: cobra.NoArgs,
ValidArgsFunction: cobra.NoFileCompletions,
Run: func(cmd *cobra.Command, args []string) {
OsExit(man(cmd, args))
},
}
return cmd
}
func man(cmd *cobra.Command, args []string) int { //nolint
if err := generateManpages(filepath.Join("/", "usr", "share", "man", "man1")); err != nil {
print.Err(fmt.Errorf("%s: %w", "can not generate man-pages", err))
return 1
}
return 0
}
func generateManpages(dst string) error {
now := time.Now()
header := &doc.GenManHeader{
Title: `gup - Update binaries installed by 'go install'`,
Section: "1",
Date: &now,
}
tmpDir, err := os.MkdirTemp("", "gup")
if err != nil {
return err
}
defer func() {
if removeErr := os.RemoveAll(tmpDir); removeErr != nil {
// TODO: If use go 1.20, rewrite like this.
// err = errors.Join(err, closeErr)
err = removeErr // overwrite error
}
}()
err = doc.GenManTree(newRootCmd(), header, tmpDir)
if err != nil {
return err
}
manFiles, err := filepath.Glob(filepath.Join(tmpDir, "*.1"))
if err != nil {
return err
}
return copyManpages(manFiles, dst)
}
func copyManpages(manFiles []string, dst string) error {
dst = filepath.Clean(dst)
for _, file := range manFiles {
file = filepath.Clean(file)
in, err := os.Open(file)
if err != nil {
return err
}
defer func() {
if closeErr := in.Close(); closeErr != nil {
// TODO: If use go 1.20, rewrite like this.
// err = errors.Join(err, closeErr)
err = closeErr // overwrite error
}
}()
out, err := os.Create(filepath.Clean(filepath.Join(dst, fmt.Sprintf("%s%s", filepath.Base(file), ".gz"))))
if err != nil {
return err
}
defer func() {
if closeErr := out.Close(); closeErr != nil {
// TODO: If use go 1.20, rewrite like this.
// err = errors.Join(err, closeErr)
err = closeErr // overwrite error
}
}()
gz := gzip.NewWriter(out)
gz.Name = strings.TrimSuffix(filepath.Base(file), ".1")
defer func() {
if closeErr := gz.Close(); closeErr != nil {
// TODO: If use go 1.20, rewrite like this.
// err = errors.Join(err, closeErr)
err = closeErr // overwrite error
}
}()
print.Info("Generate " + out.Name())
_, err = io.Copy(gz, in)
if err != nil {
return err
}
}
return nil
}