80 lines
1.3 KiB
Go
80 lines
1.3 KiB
Go
package main
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import (
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"bufio"
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"flag"
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"fmt"
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"io"
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"os"
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)
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func read(in string, data chan<- []byte) error {
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if in != "" {
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file, err := os.Open(in)
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if err != nil {
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return err
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}
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defer file.Close()
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s := bufio.NewScanner(file)
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for s.Scan() {
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data <- s.Bytes()
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}
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return nil
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}
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s := bufio.NewScanner(os.Stdin)
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for s.Scan() {
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data <- s.Bytes()
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}
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return nil
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}
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func writer(out string) (io.Writer, error) {
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if out != "" {
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file, err := os.Open(out)
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if err != nil {
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return nil, err
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}
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return file, nil
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}
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return os.Stdout, nil
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}
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func write(out string, data <-chan []byte, quit chan struct{}) error {
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w, err := writer(out)
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if err != nil {
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return fmt.Errorf("writer: %w", err)
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}
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NewParser(data, w, quit).Parse()
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return nil
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}
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func main() {
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var in, out string
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flag.StringVar(&in, "in", "", "specify a .md (Markdown) file to read from, otherwise stdin (default)")
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flag.StringVar(&out, "out", "", "specify a .gmi (gemtext) file to write to, otherwise stdout (default)")
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flag.Parse()
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quit := make(chan struct{})
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data := make(chan []byte)
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go func() {
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if err := read(in, data); err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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}
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close(quit)
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}()
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if err := write(out, data, quit); err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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}
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}
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