2021-07-03 18:26:27 +03:00
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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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2021-07-04 07:43:13 +03:00
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func reader(in string) (io.Reader, error) {
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2021-07-03 18:26:27 +03:00
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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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2021-07-04 07:43:13 +03:00
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return nil, err
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2021-07-03 18:26:27 +03:00
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}
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2021-07-04 07:43:13 +03:00
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return file, nil
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2021-07-03 18:26:27 +03:00
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}
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2021-07-04 07:43:13 +03:00
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return os.Stdin, nil
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2021-07-03 18:26:27 +03:00
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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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2021-07-04 07:31:51 +03:00
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func write(w io.Writer, b []byte) {
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fmt.Fprintf(w, string(b))
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}
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2021-07-04 07:43:13 +03:00
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type ir struct {
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r io.Reader
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quit chan struct{}
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}
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func NewIr(r io.Reader, quit chan struct{}) *ir {
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return &ir{r: r, quit: quit}
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}
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func (m *ir) Output() chan []byte {
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data := make(chan []byte)
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s := bufio.NewScanner(m.r)
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go func() {
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for s.Scan() {
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data <- s.Bytes()
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}
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close(m.quit)
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}()
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return data
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}
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2021-07-04 07:31:51 +03:00
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type ow struct {
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w io.Writer
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quit chan struct{}
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}
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func NewOw(w io.Writer, quit chan struct{}) *ow {
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return &ow{w: w, quit: quit}
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}
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2021-07-04 07:43:13 +03:00
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func (m *ow) Input(data chan []byte) {
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2021-07-04 07:31:51 +03:00
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for {
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select {
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case <-m.quit:
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return
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case b := <-data:
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write(m.w, b)
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}
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}
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}
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2021-07-03 18:26:27 +03:00
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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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2021-07-04 07:43:13 +03:00
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r, err := reader(in)
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if err != nil {
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fmt.Fprint(os.Stderr, err.Error())
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os.Exit(1)
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}
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2021-07-03 18:26:27 +03:00
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2021-07-04 07:43:13 +03:00
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w, err := writer(out)
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if err != nil {
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fmt.Fprint(os.Stderr, err.Error())
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os.Exit(1)
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2021-07-03 18:26:27 +03:00
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}
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2021-07-04 07:43:13 +03:00
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source := NewIr(r, quit)
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sink := NewOw(w, quit)
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sink.Input(source.Output())
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//NewParser(data, w, quit).Parse()
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2021-07-03 18:26:27 +03:00
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}
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