Is there RCF docs for PDF? - go

Question

My goal is to create a PDF to CSV. In this case, converting journal entries from the PDF file into CSV file.
What I've tried:
use pdftotext from linux.
The Installation:
$ sudo apt-get install poppler-utils
The code:
package main
import (
"fmt"
"os/exec"
)
func main() {
body, err := exec.Command("pdftotext", "-layout", "-q", "-nopgbrk", "-enc", "UTF-8", "-eol", "unix", "/Volumes/T7Touch/Learn/e-statement-to-t-account/5725299769Jul2022.pdf", "-").Output()
if err != nil {
panic(err)
}
fmt.Println(string(body))
}
Does it work?
The -layout option makes the output workable. The fmt.Println(string(output)) will print every journal entry per line.
row1column1 row1column2 row1column3
row2column1 row2column2 row2column2
Without the -layout option, the output will be not readable.
row1column1
row2column1
row1column2
row2column2
The problem is that this solution need to install poppler-utils to use pdftotext. Without it, it will throws error.
$ GOOS=darwin GOARCH=arm64 go build
$ ./main // will throw errors -> panic: exec: "pdftotext": executable file not found in $PATH
use https://github.com/ledongthuc/pdf
The code
package main
import (
"fmt"
"os"
"github.com/ledongthuc/pdf"
)
func main() {
content, err := readPdf(os.Args[1]) // Read local pdf file
if err != nil {
panic(err)
}
fmt.Println(content)
return
}
func readPdf(path string) (string, error) {
f, r, err := pdf.Open(path)
defer func() {
_ = f.Close()
}()
if err != nil {
return "", err
}
totalPage := r.NumPage()
for pageIndex := 1; pageIndex <= totalPage; pageIndex++ {
p := r.Page(pageIndex)
if p.V.IsNull() {
continue
}
rows, _ := p.GetTextByRow()
for _, row := range rows {
println(">>>> row: ", row.Position)
for _, word := range row.Content {
fmt.Println(word.S)
}
}
}
return "", nil
}
I intend to create pdf decoder that does exactly like $ pdftotext -layout without the need to do $ sudo apt-get install popper-utils. I believe that I can solve this if someone can help point out where to see pdftotext repository or RFC docs for PDF.