convert a file containing prompts with markdown to a tsv file with cards containing html (easy to import via anki)

md-to-anki.go

package main
import (
    "github.com/gomarkdown/markdown"
    "strings"
    "path/filepath"
    "time"
    "fmt"
    "io"
    "os"
    "log"
)

func check (err error) {
    if err != nil {
        log.Fatalln(err)
    }
}

func markup (s string) string {
    return strings.ReplaceAll(string(markdown.ToHTML([]byte(s), nil, nil)), "\n", "<br>")
}

func main () {
    if len(os.Args) < 2 {
        fmt.Println("usage: prompts <path/to/prompts.md>\noutputs <path/to/prompts-yyyy-mm-dd-hhmm.tsv>")
        os.Exit(0)
    }
    filename := os.Args[1]
    file, err := os.Open(filename)
    check(err)
    contents, err := io.ReadAll(file)
    check(err)

    // create cards using blanklines as delimiters; handle windows delimiters
    cards := strings.Split(strings.ReplaceAll(string(contents), "\r\n", "\n"), "\n\n")
    // if file started with a title, remove that "card"
    if strings.HasPrefix(cards[0], "#") { cards = cards[1:] }
    processed := make([]string, 0, len(cards))

    for _, card := range cards {
        // get the front & back fields of the card by using \n as the field delimiter
        fields := strings.Split(strings.TrimSpace(card), "\n")
        fmt.Printf("%q\n", fields)
        // treat first field as special (question), remaining fields should be collapsed into the same string
        question := markup(fields[0])
        answer := markup(strings.Join(fields[1:], "\n"))
        processed = append(processed, strings.Join([]string{question, answer}, "\t"))
    }

    // output the processed prompt data to a file we can import in anki
    date := time.Now().Format("2006-01-02")
    outpath := filepath.Join(filepath.Dir(filename), fmt.Sprintf("prompts-%s.tsv", date))
    fmt.Println(outpath)
    err = os.WriteFile(outpath, []byte(strings.Join(processed, "\n")), 0644)
    check(err)
}

example card formatting:

In golang, what package do you use to create files?
`os`

In golang, what is the signature for creating a file?
`os.Create(string, []byte, uint) error`