WIP: Add post-processing hook.

[korsbo]

This is a work in progress.

It adds a post-processing hook as a keyword argument that allows you to pass arbitrary functions which can modify the result just before it is outputted. It's a bit of a sledgehammer, but it has proven useful when I use Latexify for stuff that is automatically deployed to the web. In some cases, I have had to add additional escape characters or change the newline specification and this post-processing hook allows me to do that.

function post_processing(str)
    str = replace(str, raw"\\"=>raw"\newline")
    return str
end

latexify(something; post_processing = post_processing)

[codecov]

Codecov Report

Merging #83 into master will decrease coverage by 0.81%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
- Coverage   80.57%   79.76%   -0.82%     
==========================================
  Files          22       22              
  Lines         520      514       -6     
==========================================
- Hits          419      410       -9     
- Misses        101      104       +3

Impacted Files	Coverage Δ
src/latexarray.jl	95.23% <100%> (-0.42%)	⬇️
src/latextabular.jl	82.6% <100%> (-1.4%)	⬇️
src/latexequation.jl	100% <100%> (ø)	⬆️
src/latexinline.jl	75% <100%> (-5%)	⬇️
src/latexalign.jl	52.63% <100%> (-6.46%)	⬇️
src/plugins/DiffEqBiological.jl	76.19% <100%> (-0.74%)	⬇️
src/latexify_function.jl	75% <66.66%> (-1.67%)	⬇️
src/latexraw.jl	75.86% <0%> (-3.45%)	⬇️

---

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[coveralls]

Coverage decreased (-0.5%) to 79.303% when pulling 21a0fb3 on post_processing into 554f02e on master.

[coveralls]

Coverage decreased (-0.5%) to 79.303% when pulling 21a0fb3 on post_processing into 554f02e on master.