Questions tagged [directlua]

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15
votes
2answers
881 views

Different answers of calculations in LuaLaTeX on local computer, lua compiler and on overleaf

Here is the code. It makes use of the file matrix.lua available at the following link. https://github.com/davidm/lua-matrix/blob/master/lua/matrix.lua The following code is to be run by matrix.lua ...
9
votes
1answer
302 views

Finding Greatest Common Divisor using LuaLatex

Here is my code to find Greatest Common Divisor of two positive integers. \documentclass{article} \usepackage{luacode} \begin{luacode} function gcd(a,b) if b ~= 0 then return gcd(b, a % ...
8
votes
3answers
461 views

Arithmetics in LuaLaTeX

I have the following code. \documentclass{article} \usepackage{luacode} \begin{luacode} function fact(n) if n == 0 then return 1 else tex.sprint ( n * fact(n - 1) ) ...
6
votes
2answers
342 views

Code Comment in directlua

How can I add comments to my directlua code? {\catcode`\%=12 \directlua{ function boxed (s) ??? Add a comment ??? if not(boxedflag) then i=string.find(s,'^!!!') if(i==1) then boxedflag=true ...
6
votes
2answers
327 views

Write to aux file directly from lua

Is it possible to write to the aux file directly from within a \directlua command? I am converting an older package to LuaLaTeX, which at some point builds a large string and writes it to the aux ...
6
votes
1answer
631 views

LuaLaTeX: Calculate length in Lua

I apologize if this a rookie question, but I find it extremely hard to find a solution to my Lua problem using online searches and browsing reference manuals. I would like to calculate a length: ...
6
votes
0answers
348 views

Pre-built preamble with LuaLaTeX and microtype

I have been trying to get super-fast compiles with LuaLaTeX by using a pre-built preamble for my documents. However, every time I try to compile, I get this error: No file main.aux. [\directlua]:1: ...
5
votes
2answers
1k views

Incorrect value of Pi in Lua after 16th Decimal Place

The following is the code. \documentclass{article} \usepackage{luacode} \begin{document} \luaexec{tex.sprint(string.format('\%.20f', math.pi))} \end{document} It gives the output as 3....
5
votes
1answer
129 views

token.set_macro: \directlua vs. luacode*

If I compile the following code with LuaLaTeX I get the word "RED" as output. The call of token.set_macro inside of luacode* seems to be noneffective. \listfiles \documentclass{minimal} \usepackage{...
4
votes
3answers
261 views

Selecting a Specific Array Element in LuaTeX?

I need to create a command that goes \MyCommand{x,y} or \MyCommand{x,y,z} (both ways should be possible), where x, y, and z are three numbers. It should give the output \begin{matrix}x\\y\end{matrix} ...
4
votes
2answers
138 views

Bug in Lualatex: not printing characters from calculation

I have the following code \documentclass{article} \usepackage{luacode} \begin{document} \begin{luacode*} local matrix = require "matrix" local complex = require "complex" function cmatrix(n) return ...
4
votes
1answer
88 views

Trouble while giving input from tex.sprint function to another function in LuaTeX

I have the set.lua file with the following code. local Set = {} --module local mt = {} --metatable function Set.new (l) local set = {} setmetatable(set, mt) for ...
4
votes
1answer
156 views

Fixing problems in latin translitteration of acute accented cyrillic vowels with \directlua

A good translitteration method from cyrillic to latin characters using XeLaTeX is discussed in Using XeTeX for automatic transliteration of cyrillic letters Actually I'm using LuaLaTeX. the ...
4
votes
1answer
119 views

transform a scientific notation to decimal notation with lua

The next code gives 5e-05 with \luaveclen{0.00003}{0.00004} but I need a decimal How to get a decimal notation ? \def\luaveclen#1#2{ \directlua{ x = #1; y = #2; r=(x*x+y*y)...
4
votes
1answer
102 views

Kerning of pairs with LuaTeX for babel shorthands

I want to make use of the pairwise kerning of this answer: https://tex.stackexchange.com/a/370469/75284 using fonts.handlers.otf.addfeature to adjust the kerning of character pairs with the hyphen -. ...
4
votes
1answer
159 views

How to get a customized number of decimal places in tex.sprint / directlua / qrCode?

The number of decimal places is "9" in the following example: string.format("\%0.9f", X). How can one achieve the replacement of the fixed "9" decimal places with "NumberOfDecimalPlaces" (in ...
3
votes
2answers
83 views

How can I use \n in \directlua{} to replace empty lines

Let’s assume I have a file file.txt containing This is a test and I want to replace the contents (from within TeX) with This is\par a test I tried to use Lua but stuck with the \n in the ...
3
votes
1answer
78 views

MathML Format XML in Lua

I have successfully loaded XML in LuaLaTeX. But how to load MathML. Any Lua Modules are available? My LaTeX file: \documentclass{article} \usepackage{luacode} \begin{luacode*} xml = require('luaxml-...
3
votes
1answer
52 views

Importing luaqd library in LuaTeX

I am looking for easy way to importing lqd or some other similar library in LuaTeX so that It can used in LaTeX. The lmapm library is wriiten by Luiz Figueiredo, one of the authors of the Lua ...
3
votes
0answers
275 views

TeXstudio - Preventing syntax highlighting effects from LaTeX special characters in Lua code

Is there way to make TeXstudio ignore the contents of a \directlua command when performing syntax highlighting? Currently, it ends up causing highlighting like: Which is distracting when scanning the ...
2
votes
2answers
204 views

How to pass array of values in lualatex?

Here is code for matrix multiplication. \documentclass{article} \usepackage{luacode} \begin{luacode} function MatMul( m1, m2 ) if #m1[1] ~= #m2 then return nil end local ...
2
votes
1answer
57 views

realscripts – can fakescripts substitute single missing chars

I have a font with real OT-superscripts which I can use easily with the realscripts-package. But I also need a superscript decimal dot which doesn't exist, thus realscripts falls back to the regular ...
2
votes
2answers
1k views

Using direct lua to read binary bytes to plain text?

In this thread, @David Carlisle tells us how to use luatex to read some of the properties of a png image. Alas, the image library seems to fail regarding the colorspace property. Always reports nil. ...
2
votes
1answer
99 views

Evaluating Mathematical Expressions in Lua

Here is the code. \documentclass{article} \begin{document} \directlua{tex.sprint(tostring(math.sin(math.pi)))} \\ \directlua{tex.sprint(tostring(math.tan(math.pi/2)))} \end{document} I am expecting ...
2
votes
1answer
78 views

Coerce LuaTeX into outputting a newline character

I encounter a problem when I wish to output a text file using a \directlua directive. There where I wish a newline character to be, I run into TeX problems. My solution is to invoke the dofile ...
2
votes
1answer
87 views

Setting Environment while defining complex numbers in LuaTeX

My question is inspired from this question that I asked earlier. Here is the code. \documentclass{article} \usepackage{parskip,luacode} \begin{luacode*} M = {} -- the module complex = {} -- ...
2
votes
1answer
77 views

Error when Metatable is set for global environment in Lua LaTeX

I have the set.lua file with the following code. local Set = {} --module local mt = {} --metatable setmetatable(_G,{__index=function(t,k) return k end}) --some functions return Set ...
2
votes
1answer
45 views

siunitx table, formatting \directlua{} ouput

I have a table with values calculated with \directlua{}. They are formatted with siunitx columns. I want to turn some values bold or change their color. It appears that the output of \directlua{} ...
2
votes
1answer
103 views

Gregorio - Glyph missing?

I've just updated to TexLive 2019 on Mac and then Gregorio 5.2.1. This is the file I'm trying to compile (with my past distribution of TexLive 2018): % !TEX program = LuaLaTeX+se % !TEX encoding = ...
2
votes
1answer
2k views

How to get a carriage return (newline) in directlua (tex.sprint) inside a QRCode?

How can one get a carriage return at the end of each line (Lualatex) ? \documentclass{article} \usepackage[nolinks,forget]{qrcode}% \begin{document} \newcommand{\Space}[0]{\ }% \newcommand{\...
1
vote
1answer
111 views

Nesting of functions not working in lualatex

Here is the code. It makes use of the file matrix.lua available at the following link. https://github.com/davidm/lua-matrix/blob/master/lua/matrix.lua \documentclass{article} \usepackage{luacode} \...
1
vote
1answer
274 views

How can I use math.log10 function with the directlua?

I would like to know how I can use math.log10 function with the directlua, because I always get none from directlua. Following a minimal example: %Engine: LuaLaTeX; %Encoding: UTF-8; \documentclass[...
1
vote
1answer
252 views

Create external file (like a Makefile) whit real tabs

I'm trying to generate a external Makefile (and others) file using latex and the filecontents or fancyvrb package. As the \t (tabs) characters in input file are converted to space in output file (see ...
1
vote
0answers
40 views

Define an incremental counter with Lua

I would like to receive a suggestion for this example. Really, it is more a question related to Lua scripting. Minimal working example \documentclass{beamer} \directlua{dofile("timer.lua")} ...
0
votes
1answer
151 views

I wish to set PDF metadata from within LuaTeX

I found out how to implement the Lua code for setting PDF metadata. I have failed. My code: \directlua0{ pdf.setinfo ("Title", "Naked Cheerleaders on Crack") pdf.setinfo ("Creator", "LuaTeX") ...
0
votes
1answer
92 views

Using output of one lua function as input of another function in tex file

The following is the code. \documentclass{article} \usepackage{luacode} \begin{document} \begin{luacode*} function string(x) tex.sprint(x) end function combine(x,y) tex.sprint(x.." "..y) end \end{...
0
votes
1answer
55 views

How to integrate xkeyval keys with Lua code

I am currently maintaining a template that uses directlua to compute a value based on a number of parameters defined as command keys with keyval. As it stands, it compiles correctly. However, when I ...
0
votes
0answers
29 views

Issues trying to expand tex macro's fully in directlua

I am trying to create a JSON file from a LaTeX report that will be used for some post-processing. For a number of values from my report I will need an expanded version that basically only includes ...
0
votes
0answers
126 views

Issue with xparse and lualatex

I have the following code \documentclass{article} \usepackage{luacode,xparse,amsmath} \begin{luacode*} local matrix = require "matrix" local complex = require "complex" function add(m,n) m=...