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main.go
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main.go
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package main
import (
"bytes"
"errors"
"flag"
"fmt"
"io"
"os"
"os/exec"
"github.com/charmbracelet/glamour"
"golang.org/x/term"
)
var (
flagDebug = flag.Bool("d", false, "print debug output")
flagNewLines = flag.Bool("n", false, "preserve newlines")
flagPager = flag.Bool("p", false, "send output to a pager")
flagWidth = flag.Int("w", 0, "specify a maximum width")
)
func debugf(format string, a ...any) {
if *flagDebug {
fmt.Fprintf(os.Stdout, "debug: "+format+"\n", a...)
}
}
func main() {
err := Main()
if err != nil {
fmt.Fprintf(os.Stderr, "error: %s", err.Error())
}
}
func Main() (err error) {
flag.Parse()
inReader := os.Stdin
if len(flag.Args()) > 0 {
inReader, err = os.Open(flag.Arg(0))
if err != nil {
return err
}
}
in, err := io.ReadAll(inReader)
if err != nil {
return err
}
outFd := int(os.Stdout.Fd())
width := *flagWidth
if term.IsTerminal(outFd) {
width, _, err = term.GetSize(int(os.Stdout.Fd()))
if err != nil {
return err
}
}
debugf("term width: %d", width)
// Limit width to the specified value.
if *flagWidth > 0 && width > *flagWidth {
width = *flagWidth
}
debugf("final width: %d", width)
opts := []glamour.TermRendererOption{
glamour.WithEnvironmentConfig(),
}
if *flagNewLines {
opts = append(opts, glamour.WithPreservedNewLines())
}
if width > 0 {
opts = append(opts, glamour.WithWordWrap(width))
}
r, err := glamour.NewTermRenderer(opts...)
if err != nil {
return err
}
out, err := r.Render(string(in))
if err != nil {
return err
}
if flagPager != nil && *flagPager {
err = page(out)
} else {
fmt.Print(out)
}
return err
}
func page(out string) error {
var stderr bytes.Buffer
cmd := exec.Command("less", "-R", "-F")
cmd.Stdin = bytes.NewBuffer([]byte(out))
cmd.Stdout = os.Stdout
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
return errors.Join(err, fmt.Errorf("stderr: %s", stderr.String()))
}
return nil
}