For hugo to pull in changes we need to create a pull request. Creating the
branch for that is repetitive and can be easily automated, so let's do
that. Creating the pull request itself is not as easily automated as it might
be necessary to provide a little context for the changes - so let's keep it
manual.
As headlines are always lvl (indent) 0 I thought it would be clever to abuse
the lvl field to store the headline lvl. Well, here we are - it wasn't clever.
List items only end when their parent ends or they run into something that's
not indented enough - everything else becomes part of the list item. Abusing
the token.lvl field (indent) for the headline lvl means headlines look indented
to the list item parsing logic - i.e. they become part of the list item if the
headline has a high enough lvl. That should never happen - so let's get rid of
the hack and (re-)calculate the headline lvl when we need it.
Turns out Org mode supports image links natively and we don't have to go out of
spec!
From https://orgmode.org/manual/Images-in-HTML-export.html:
[...] if the description part of the Org link is itself another link, such as
‘file:’ or ‘http:’ URL pointing to an image, the HTML export back-end in-lines
this image and links to [...]
html does not support table separator rows as Org mode does. Emacs org export
simulates rows as defined by separators by wrapping all the rows between 2
separators into a separate tbody. The html spec is fine with that [0] so we
follow.
[0] https://developer.mozilla.org/en-US/docs/Web/HTML/Element/tbody
All tags are put on a line by themselves to help with visual
diffing. Apparently this extra cosmetic whitespace causes problems inside p
tags for ppl who want to use `white-space: pre`. Not much hurt for visual
diffing in removing cosmetic whitespace for just p tags and can't think of
anything that would break because of this right now. So let's do it and wait
for things to break.
hugo is nice - but it's huge. I've never built a static site generator before
and thought the world could use one more - it's not like there's already enough
choice out there!
No, but seriously. I love hugo and it has all the bells and whistles and you
should definitely use that and not this. I just like reinventing the wheel to
learn about stuff - and I like the 80/20 rule. This gives like 60% of what I
want already and is tiny fraction of hugo in terms of LOC (hugo without it's
bazillion dependencies is like 80k+ - this is like 500 and very likely won't
ever grow above let's say 5k).
Also org mode is awesome and why not use it as a configuration format as
well. Let's see where this goes. YOLO.
if we define a custom LINK for file we run into index problems bc it's trimmed
before already - this fixes that. Shouldn't ever happen but whatever, fuzzing
found it.
To support code block directives like :exports none we need context - i.e. we
need to have the block and it's results at once and can't just render them
independently.
inside src example blocks lines starting with `\s*,` are escaped - i.e. org
mode will not try to parse them as e.g. a headline. We don't want to render the
escape commata to html so let's take them out - and put them back in before
rendering to org. Doing it this way allows us to render them correctly even
when the input did not include them.
see https://orgmode.org/manual/Literal-Examples.html#Literal-Examples
While example blocks do not render inline markup and are thus parsed raw in
some way, their contents are not literal html and thus still need to be html
escaped.
delimiters are not always 2 in length - $ being the exception. Also we have to
make sure to handle both $ and $$ delimiters.
Not proud of this solution but can't think of anything simpler right now - will
come back to this later hopefully.
The org mode toc OPTION does not just support true/false - it also allows
specifying the max headline level [1] to be included in the toc.
[1] headline level as seen in org mode - not the html tag level
We want original whitespace to be rendered in some cases (e.g. verse
blocks). This requires information about the original whitespace to be
preserved during paragraph parsing. As html ignores (collapses) whitespace by
default we don't have to adapt the html writer and can just selectively enable
rendering of the preseverved whitespace wherever we want it using
css (white-space: pre).
To differentiate meaningful whitespace from document structure based
indentation (i.e. list item base indentation) we need to introduce
document.baseLvl. A paragraph by itself does not have enough information to
differentiate both kinds of whitespace and needs this information as context
[0].
As we're already touching list indentation i went along and improved (fixed?)
descriptive list item indentation rendering in the org writer (it should match
emacs tab behavior - i.e. indent subsequent lines up to the `:: `).
[0] e.g. list items can contain blank lines - a paragraph starting with a blank
line would not know that it is part of a list item / has a base indentation -
the blank line would suggest a baseLvl of 0.
WriteNodesAsString is simple enough to implement but exposing it is helpful in
the implementation of extending writers and we don't aim to keep writer a small
interface so let's expose it.
Extension of the org & html writers is made possible by creating circular
references between the extending and extended writer - that way the extending
writer can forward all methods it doesn't implement to the extended writer and the
extended writer can use the extending writer as the root for method calls to
make sure methods overridden in the extending writer are used even for nested
method calls.
This circular reference leads to problems when cloning writers - cloning the
extended writer merely copies the pointer to the extending writer - i.e. the
extending writer does not get cloned with an updated reference to the extended
writer. Thus method calls to the extending writer act as if no cloning took
place and things break.
The easiest solution is to just get rid of cloning. We could also clone the
ExtendingWriter and replace it's reference to the extended writer with the just
cloned one but that's harder so we just remove it.
As there are a lot of "extending writer" and "extended writer" in the above
paragraphs and I'm too lazy to write up something better here's another attempt
at a TLDR:
Cloning is broken as ExtendingWriter is a reference to a writer that has
a reference to the writer we are cloning - that writer would have to have it's
reference updated but that's hard. So we solve it it by not cloning at all.
fuzzed index out of range and moved range check into for condition as \\
followed by spaces at the end of the inline text should not be turned into an
ExplicitLineBreak (just like \\ not followed by spaces).
Go does not support inheritance, just composition. While composition with type
embedding (i.e. forwarding method calls to the embedded type) can replace
inheritance for most use cases this is not one of them. We really want to
overwrite methods so that method calls from inside the base writer also use the
custom methods ouf our extending writer - naive embedding does not work here
as the this in this.WriteText refers to the embedded type rather than the outer
extending type (see open recursion).
A simple solution is to make a reference of the extending type
available from the extended type and use that for nested method calls. We'll go
with that one as it does not require huge code changes. Another solution would
be to flatten the writing process and not use nested method calls - this is
what blackfriday does. Assuming the current solution works I feel it's cleaner
and keeps the ugliness of simulating inheritance with composition contained to
a small portion of the code while blackfridays approach requires all write
methods to be written in a flat style (i.e. not do nested calls to write by
being called twice with entering / leaving). The current solution becomes ugly
if we want to do multiple levels of extending but i don't expect that to be a
valid use case - if it turns out to be one we can always adapt to it
later. YAGNI.
