serhack / pdf-diff Goto Github PK

As a command line tool, pdf-diff is the perfect choice for nerdy people. I was wondering if there was any alternative way to show the potentialities of pdf-diff to newbie too. It came up in my mind a sort of local server that someone can execute and using that they can compare pdf files.

Currently we use a strong red as background color (255, 0, 0). This might be nice as a demo, but if we want to have a more practice tool we should have a more transparent color for the background. This issue tracks the progress to make it more transparent.

Finding Poppler for Windows is a herculean task. Latest build is not available anywhere. So far, I could find the old Windows builds at below link and it works after you set it in PATH environment variable.

https://blog.alivate.com.au/poppler-windows/

Link this in the Readme so Windows users don't have to spend hours in order to make this tool work.

We should implement a flag such as -bg-color that can be used to specify an hex color that will be used as a background color for highlighting differences across PDF files.

i ran some samples files.

One has just one line with a word added.

It seems the current compare logic does not flag single word differences ?

I can send a sample if needed.

Hi! Very cool project.

I'm having some problems, I'm hoping you can offer some guidance in case I am doing something wrong.

• So I cloned the project.
• Downloaded a dummy pdf.
• Downloaded another dummy pdf and made some edits to it. Saved.
• ran go run main.go dummy.pdf dummy2.pdf

Expected Output

The images generated by pdf are inserted into a folder named as the hash of the content of the pdf file. E.g. the file has the hash fc324.., the images are in the fc324 folder. If a folder with that name already exists, pdf-diff will not create any images since it consider that images were already generated.
Once ran, the images are created in the folder generated.

Actual Output

I got two separate folders with different shas generated, but with no content. Also the generated folder remains empty.

What am I doing wrong?

We can replace

package main

import (
	"flag"
	"fmt"
	"image/jpeg"
	"os"
	"path/filepath"

	"github.com/gen2brain/go-fitz"
)

func main() {
	// flags for source dir (pdf) and output dir (png,etc)

	sourceFile := flag.String("source", ".", "source file pdf")
	targetDir := flag.String("target", ".", "target dir")

	flag.Parse()

	fmt.Println("sourceFile:", *sourceFile)
	fmt.Println("targetDir:", *targetDir)

	doc, err := fitz.New(*sourceFile)
	if err != nil {
		panic(err)
	}

	defer doc.Close()
	/*
		// output to runtime dir
		currentDir, err := os.Getwd()
		//tmpDir, err := ioutil.TempDir(os.TempDir(), "fitz")
		if err != nil {
			panic(err)
		}

		// concat out dir
		tmpDir := filepath.Join(currentDir, "out")
		err = os.MkdirAll(tmpDir, os.ModePerm)
	*/
	err = os.MkdirAll(*targetDir, os.ModePerm)

	if err != nil {
		panic(err)
	}

	// Extract pages as images
	for n := 0; n < doc.NumPage(); n++ {
		img, err := doc.Image(n)
		if err != nil {
			panic(err)
		}

		f, err := os.Create(filepath.Join(*targetDir, fmt.Sprintf("test%03d.jpg", n)))
		if err != nil {
			panic(err)
		}

		err = jpeg.Encode(f, img, &jpeg.Options{jpeg.DefaultQuality})
		if err != nil {
			panic(err)
		}

		f.Close()
	}

	// Extract pages as text
	for n := 0; n < doc.NumPage(); n++ {
		text, err := doc.Text(n)
		if err != nil {
			panic(err)
		}

		f, err := os.Create(filepath.Join(*targetDir, fmt.Sprintf("test%03d.txt", n)))
		if err != nil {
			panic(err)
		}

		_, err = f.WriteString(text)
		if err != nil {
			panic(err)
		}

		f.Close()
	}

	// Extract pages as html
	for n := 0; n < doc.NumPage(); n++ {
		html, err := doc.HTML(n, true)
		if err != nil {
			panic(err)
		}

		f, err := os.Create(filepath.Join(*targetDir, fmt.Sprintf("test%03d.html", n)))
		if err != nil {
			panic(err)
		}

		_, err = f.WriteString(html)
		if err != nil {
			panic(err)
		}

		f.Close()
	}
}

This will build for all OS because the libs are included for all os at https://github.com/gen2brain/go-fitz/tree/master/libs

works for me on Mac. Maybe test on windows, and linux.

it would replace poppler which is very heavy IMHO and make the golang binary fully contained to a single file.