pb-html-to-rtf.swift

#!/usr/bin/env swift
import Cocoa

let args = CommandLine.arguments
var argi = 1

var fontname = "Iosevka"
var fontsize = CGFloat(40.0)

while argi < args.count {
    let arg = args[argi]
    if arg == "-f" {
        fontname = args[argi+1]
        argi += 1
    } else if arg == "-s" {
        fontsize = CGFloat(Float(args[argi+1]) ?? 40.0)
        argi += 1
    } else if arg == "-h" {
        print("\(args[0]) [-f <fontname>] [-s <fontsize>]")
        print("If there is HTML on the pasteboard, cleans it a bit, and puts it back on as RTF for e.g. Keynote")
        exit(1)
    }
    argi += 1
}

let type = NSPasteboard.PasteboardType.html
if let string = NSPasteboard.general.string(forType: type) {
    separate("Input")
    print(string)
    separate("Output")
    let output = processed(string)
    print(output)
    
    let data = Data(output.utf8)
    if let attributedString = try? NSMutableAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html], documentAttributes: nil) {
        let fullRange = NSRange(location: 0, length: attributedString.length)
        let font = NSFont(name: fontname, size: fontsize) ?? NSFont(name: "Iosevka", size: fontsize)
        attributedString.addAttribute(NSAttributedString.Key.font, value: font as Any, range: fullRange)
        let gp = NSPasteboard.general
        gp.prepareForNewContents()
        gp.writeObjects([attributedString])
        gp.setString(output, forType: type)
    }
    
    
} else {
	print("No html on pasteboard")
	exit(1)	
}


func processed(_ input: String) -> String {
    let bc = #/background-color: #[\da-f]+;/#
    var result = input.replacing(bc) { _match in "" }
    let font = #/font-family: [^;]+;/#
    result = result.replacing(font) {_match in "font-family: '\(fontname)';"}
    let fontsize = #/font-size: [^;]+;/#
    result = result.replacing(fontsize) {_match in "font-size: \(fontsize)pt;"}
    result = result.replacing(#/line-height: [^;]+;/#) {_match in ""}
    return result
}

func separate(_ t: String) {
    print("\(t):")
    print("".padding(toLength: t.count + 1, withPad:"=-", startingAt:0))
}