Markdown formatting is overly sensitive to layout

[nrnrnr]

My LaTeX markup allowed a space to creep in before a dash in a Markdown list. I expected pdfpc to recognize the markup, but it did not.

To reproduce the behavior,

1. Run pdflatex on the attached test.tex file.
2. Run pdf-presenter-console -f markdown on the resulting test.pdf. (My test.pdf is also attached.)

I would expect all four Markdown notes to render as lists. But only the first renders as a list.

(And since you're redefining \\, it is probably worth redefining \par as well.)

pdfpc version: v4.5.1pre

Used Distribution (GTK version, vala version): Debian stable (bullseye). No idea how to find other versions, but package dependency shows "libgtk-3-0 (>= 3.21.4)".

Display Server (X/Wayland): X

HiDPI Setting (yes/no): I don't know what this is, but if it helps, the display size is 3840x2160 pixels.

[fnevgeny]

1. Run pdflatex on the attached test.tex file.

I see no attachments.

[nrnrnr]

My apologies. I must have botched the attachment process.

I'm trying again. In order to attach test.tex, I had to rename it test.tex.txt.

test.tex.txt
test.pdf

[fnevgeny]

I see your point, but it's unrelated to pdfpc, which by itself doesn't "recognize" (i.e., render) markdown. It uses libmarkdown2 (aka discount). Furthermore, the text is passed by the \pdfpcnote macro, which is indeed rather picky. If you wish, submit this as a bug to latex-pdfpc.

[nrnrnr]

If I get a chance I'll see if I can figure out whether the LaTeX or libmarkdown2 is more to blame.

[HermannDppes]

Extracting the notes from your PDF, I find these:

This is a markdown note
 
 - One
 - Two
 - Three
 

This is another markdown note 
- Four
 - Five
 - Six
 

This is a third markdown note par - Seven
 - Eight
 - Nine

And a fourth
 par - Ten
 - Eleven
 - Twelve

Running them through Markdown.pl, only the first one is a list. So, as the intention seems to be merely to implement Markdown, I see no evidence of any bug in pdfpc or discount. Though original Markdown is notoriously underspecified and if at some point more people complain about pdfpcs Markdown rendering, it may be a desirable enhancement of pdfpc to be less noticeably incompatible with the increasing majority of dialects in usage which, I think, do not require the (mostly) blank line before a list, for example.

[fnevgeny]

This is another markdown note 
- Four
 - Five

BTW, can someone understand where the space before the last - comes from?

[HermannDppes]

This is another markdown note 
- Four
 - Five

BTW, can someone understand where the space before the last - comes from?

If I write ? for the line break byte (assuming Unix …), the input there is \\?- Five but since TeX tends to treat single line breaks the same as spaces, it might just as well be \\ - Five where there is clearly a space immediately after the \\, i.e. at the beginning of the line. Parsing and executing TeX in my head is kind of hard but I think this is precisely what I would have expected.