Cfrgtkky

Maybe the title is a bit misleading and it's my pilot post on here :)

Anyhow, I have a paragraph with ,let's say 100 words, from which 10 of those words are word "dokument". I have to make a command that colors that word in that paragraph, but I can't seem to get it work, I'm including part of my code down below and I hope someone can debug it and help me. :)

begin{center}

fontsize{17pt}{2}selectfont TASK 1

end{center}



begin{center}

begin{minipage}[b]{70mm}



bojenje{dokument}



Ovo je primjer centriranog textbf{paragrafa} u okruženju

minipage čija je širina 70 mm. Unutar dokumenta

svaka instanca riječi dokument je obojena plavom bojom.

Možda da ne bi bilo loše napraviti komandu koja boji riječ

dokument plavom bojom?

Naslov dokumenta je font visine 17 pt.



end{minipage}

end{center}

This is not really possible with pdflatex or xelatex. See the related questions automatic word in color, how to auto bold a keyword?, Is it possible to have certain words in the document always in bold?, where the advice is to define a macro (here that would be something like defdokument{textcolor{blue}{dokument}} and then do search and replace in your editor to change all occurrences of dokument into dokument (of course you can also skip the macro and search and replace dokument with textcolor{blue}{dokument}). This would indeed be the easiest solution.

However, it can be done with LuaTeX, as noted in Is it possible to have certain words in the document always in bold?. Things have changed a bit since 2011 so here is an updated version. The idea is to register a callback for processing the lines in your document, and use this callback to replace every occurrence of your target word with the same word as argument to textcolor{blue}.

The simplest version with the word hardcoded and coloring for the whole document:

documentclass{article}

usepackage{luacode}

usepackage{xcolor}

begin{luacode}

    function translate(line)

        return string.gsub(line, "dokument", "\textcolor{blue}{dokument}")

    end

    luatexbase.add_to_callback("process_input_buffer", translate, "autocolor")

end{luacode}

begin{document}

Ovo je primjer centriranog textbf{paragrafa} u okruženju

minipage čija je širina 70 mm. Unutar dokumenta

svaka instanca riječi dokument je obojena plavom bojom.

Možda da ne bi bilo loše napraviti komandu koja boji riječ

dokument plavom bojom?

Naslov dokumenta je font visine 17 pt.

end{document}

For a bit of flexibility you can use some regular expression syntax to make sure the word is surrounded by word boundaries and to allow suffixes (here for example to color also the a in dokumenta. You can also activate and deactivate the callback with a separate command to be able to switch the automatic coloring on and off. Furthermore, you can make the replacement word a variable instead of hardcoding it in the gsub call.

MWE:

documentclass{article}

usepackage{luacode}

usepackage{xcolor}

begin{luacode}

    local myword = "init"



    local gsub = string.gsub

    function translate(line)

        wordpattern = "%f[%a]" .. myword .. "%a*%f[%A]"

        return gsub(line, wordpattern, "\textcolor{blue}{%1}")

    end



    function setword(newword)

        myword = newword

    end

end{luacode}



newcommand{startcoloring}[1]{directlua{setword("#1")}%

directlua{%

luatexbase.add_to_callback("process_input_buffer", translate, "autocolor")}}



newcommandstopcoloring{directlua{%

luatexbase.remove_from_callback("process_input_buffer", "autocolor")}}



begin{document}

The word dokument is not colored.\



startcoloring{dokument}

Ovo je primjer centriranog textbf{paragrafa} u okruženju

minipage čija je širina 70 mm. Unutar dokumenta

svaka instanca riječi dokument je obojena plavom bojom.

Možda da ne bi bilo loše napraviti komandu koja boji riječ

dokument plavom bojom?

Naslov dokumenta je font visine 17 pt.\

stopcoloring



Again dokument is not colored.

end{document}

Result:

To make it even more general you can create a list of target words (called table in Lua) and loop over all of them. Code:

documentclass{article}

usepackage{luacode}

usepackage{xcolor}

begin{luacode}

    wordlist = {}



    local gsub = string.gsub

    function translatelist(line)

        for _, word in ipairs(wordlist) do

            wordpattern = "%f[%a]" .. word .. "%a*%f[%A]"

            line = gsub(line, wordpattern, "\textcolor{blue}{%1}")

        end

        return line

    end



    function addword(newword)

        table.insert(wordlist,newword)

    end 

end{luacode}



newcommand{startcoloring}[1]{directlua{%

luatexbase.add_to_callback("process_input_buffer", translatelist, "autocolor")}}



newcommandstopcoloring{directlua{%

luatexbase.remove_from_callback("process_input_buffer", "autocolor")}}



begin{document}

The word dokument is not colored.\



directlua{addword("dokument")}

directlua{addword("instanca")}

startcoloring{}

Ovo je primjer centriranog textbf{paragrafa} u okruženju

minipage čija je širina 70 mm. Unutar dokumenta

svaka instanca riječi dokument je obojena plavom bojom.

Možda da ne bi bilo loše napraviti komandu koja boji riječ

dokument plavom bojom?

Naslov dokumenta je font visine 17 pt.\

stopcoloring



Again dokument is not colored.

end{document}

Result: