implement `\text` and friends

[Moelf]

close #39, close #52

[Moelf]

julia> generate_tex_elements(L"\textit{123}")
3-element Vector{Any}:
 (TeXChar '1' [index 18 in NewComputerModern - 10 Italic], [0.0, 0.0], 1.0)
 (TeXChar '2' [index 19 in NewComputerModern - 10 Italic], [0.5109999775886536, 0.0], 1.0)
 (TeXChar '3' [index 20 in NewComputerModern - 10 Italic], [1.0219999551773071, 0.0], 1.0)

julia> generate_tex_elements(L"\text{123}")
3-element Vector{Any}:
 (TeXChar '1' [index 18 in NewComputerModern Math - Regular], [0.0, 0.0], 1.0)
 (TeXChar '2' [index 19 in NewComputerModern Math - Regular], [0.5, 0.0], 1.0)
 (TeXChar '3' [index 20 in NewComputerModern Math - Regular], [1.0, 0.0], 1.0)

not sure how to un-remove the space

[Kolaru]

Do you know if there is additional rules different from in \text than otherwise in math mode ? If it is only the spaces, I can special case it. Otherwise, I think I'll need to think more about the parser.

[Moelf]

I'm not a tex guru, but I read

• https://tex.stackexchange.com/questions/22350/difference-between-textrm-and-mathrm
• https://tex.stackexchange.com/questions/19502/is-there-a-preference-of-when-to-use-text-and-mathrm
• https://tex.stackexchange.com/questions/98008/is-mathrm-really-preferable-to-text

I think the main thing is just space and fonts

[Moelf]

to me the most important aspect of this PR is to not error, because people tend to think it just can't be done.

whereas if it's just the spacing is wrong, they would immediately know to add a ~ or whatever

[codecov-commenter]

Codecov Report

Merging #70 (f2bed42) into master (c757b00) will increase coverage by 0.28%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   78.45%   78.74%   +0.28%     
==========================================
  Files           7        7              
  Lines         441      447       +6     
==========================================
+ Hits          346      352       +6     
  Misses         95       95              

Impacted Files	Coverage Δ
src/parser/commands_registration.jl	34.78% <ø> (ø)
src/engine/layout.jl	89.60% <100.00%> (ø)
src/parser/parser.jl	73.68% <100.00%> (+1.08%)	:arrow_up:

---

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[Kolaru]

I special cased the spaces.

Thanks a lot for the contribution !