(Feature request) Extract pages and merge PDFs using text files (.txt or .json or .toml)

[bader-nasser]

It would be nice to be able to extract some pages from a PDF using a file that looks like this:

6
# from 2 to 4
2-4
#from 11 to 10
19 10
# NO spaces are allowed before qualifiers and rotations
12 15odd
1south

# The following comment causes the program to create an extra file
# with "-share" in the name because it contains the word share
# share up to here
7- 4
3

# last page
end
# first page from the last!
r1

# but if you use "share" again in the comments, the last one wins!

and to be able to merge PDFs using .json or .yaml or .toml files, that looks like:

// comments are allowed!
{
	"$schema": "../../data.schema.json",
	"output": "../pdfs/output.pdf",
	"compress": true,
	"files": [
		"../pdfs/input-1.pdf",
		{
			"name": "../pdfs/input-3.pdf",
			"pages": 2
		},
		{
			"name": "../pdfs/input-3.pdf",
			"pages": [
				1,
				"3",
				" 4 -6",
				"end 12even",
				"8 - 11odd ",
				"end - r5",
				"2- 5even, 14"
			]
		},
		{
			"name": "../pdfs/input-3.pdf",
			"data": "data.txt"
		}
	]
}

Note: I created a cli that does these things but some people prefer to use a GUI, so I thought maybe it can be added to your program if you like the idea and find it beneficial.