multiline TeX equations with dollar signs in html

[chiyahn]

I have found that

$x^2 &= x \cdot x \\ &= \beta x$

or

$$x^2 &= x \cdot x \\ &= \beta x$$

both can be compiled in .html using the default weave commands, but whenever I try to compile

$ 
x^2 &= x \cdot x \\ &= \beta x
$

or

$$
x^2 &= x \cdot x \\ &= \beta x
$$

I get the following errors:

ERROR: MethodError: no method matching show(::Base.GenericIOBuffer{Array{UInt8,1}}, ::MIME{Symbol("text/plain")}, ::Symbol)
You may have intended to import Base.show
Closest candidates are:
  show(::IO, ::MIME{Symbol("text/html")}, ::Markdown.MD) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\Markdown2HTML.jl:230
Stacktrace:
 [1] #sprint#325(::Nothing, ::Int64, ::Function, ::Function, ::MIME{Symbol("text/plain")}, ::Vararg{Any,N} where N) at .\strings\io.jl:101
 [2] sprint(::Function, ::MIME{Symbol("text/plain")}, ::Vararg{Any,N} where N) at .\strings\io.jl:97
 [3] tohtml(::Base.GenericIOBuffer{Array{UInt8,1}}, ::MIME{Symbol("text/plain")}, ::Symbol) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\Markdown2HTML.jl:12
 [4] tohtml(::Base.GenericIOBuffer{Array{UInt8,1}}, ::Symbol) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\Markdown2HTML.jl:34
 [5] html(::Base.GenericIOBuffer{Array{UInt8,1}}, ::Symbol) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\Markdown2HTML.jl:164
 [6] html(::Base.GenericIOBuffer{Array{UInt8,1}}, ::Array{Any,1}) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\Markdown2HTML.jl:87
 [7] html(::Base.GenericIOBuffer{Array{UInt8,1}}, ::Markdown.MD) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\Markdown2HTML.jl:92
 [8] #sprint#325(::Nothing, ::Int64, ::Function, ::Function, ::Markdown.MD) at .\strings\io.jl:101
 [9] sprint at .\strings\io.jl:97 [inlined]
 [10] html(::Markdown.MD) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\Markdown2HTML.jl:227
 [11] format_chunk(::Weave.DocChunk, ::Dict{Symbol,Any}, ::Weave.JMarkdown2HTML) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\format.jl:132
 [12] format(::Weave.WeaveDoc) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\format.jl:33
 [13] #weave#10(::Symbol, ::Symbol, ::Symbol, ::Dict{Any,Any}, ::Symbol, ::String, ::Nothing, ::String, ::Symbol, ::Bool, ::Nothing, ::Nothing, ::Nothing, ::Array{String,1}, ::String, ::typeof(weave), ::String) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\Weave.jl:112
 [14] weave(::String) at C:\Users\Chiyoung Ahn\.julia\dev\Weave\src\Weave.jl:100
 [15] top-level scope at none:0

I tried the change made in #165, but seems like the equations are not still displayed properly although compilation can completed without any error. FYI I am using Windows 10, Julia 1.0.2 with Weave version of 0.6.1

[chiyahn]

I just have tried the new change made in #165 and checked out the most up-to-date repo -- compilation can be done successfully, but seems like equations are not displayed properly.

Compiling the following file in HTML

---
title: Testing Weave.jl
author: chiyahn
date: 28th January 2019
---

## All star

Hey now, you're an all-star, get your game on, go play -- *all that glitters is gold*

$$
x^2 = 2 \beta x
$$

will give something like

Note that raw equations are placed between :$ and $

[mpastell]

That is the expected behavior with Julia Markdown, you either have to type the $ signs as in your first examples or use a math block https://docs.julialang.org/en/v1/stdlib/Markdown/#Display-equations-1.

[mpastell]

Support for multiline equations with

$$
x^2 &= x \cdot x \\ &= \beta x
$$

has been added