how to know the BulletList context and indent properly when using custom lua write.

how to know the BulletList context and indent properly when using custom lua write.

[Lei Zhang]

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I am try to write a custom lua script to convert markdown syntax to 
tiddlywiki.

I found the BulletList do not work as expected. You can get the code from 
[0]

function BulletList(items)
  local buffer = {}
  for _, item in pairs(items) do
    table.insert(buffer, "* " .. item)
  end
  return table.concat(buffer, "\n")
end

when render the markdown like below

* test
  * test2
    * test3
* test4
* test5

by using `pandoc -t md2tid.lua test.md`, i got 

* test

* test2

* test3
* test4
* test5

But what i expected is

* test
** test2
** test3
* test4
* test5

The issue here is that i have no way to know what indent i should use in 
the BulletList function.

any  guys have idea to improve this? thanks a lot.


[0] https://github.com/jeffrey4l/pandoc-addons/blob/master/md2tid.lua#L217

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Re: how to know the BulletList context and indent properly when using custom lua write.

[Albert Krewinkel]

The problem is that evaluation in the custom Lua writer happens
bottom-up, which is why the inner lists cannot know how many levels
there are above them.

That being said, there is a way to work around this, but it isn't
pretty. It works rather accidentally, due to the way function's are
called: Instead of defining the `BulletList` function on the top-level,
as one would normally do, return it via the metatable-lookup of the
global environment `_G`. This allows to alter state each time the
function is looked-up, which happens right before the items are
converted to string. This way, one can keep track of list-nesting.

E.g.:

    -- table to keep track of list nesting
    local bullets = {}

    -- replacement for BulletList, returned via global metatable
    function BulletList_ (items)
      local buffer = {}
      for _, item in pairs(items) do
        table.insert(buffer, table.concat(bullets) .. ' ' .. item)
      end
      -- remove bullet inserted in metatable
      table.remove(bullets)
      return table.concat(buffer, '\n')
    end

    setmetatable(
      _G,
      {
        __index = function (t, f)
          if f == 'BulletList' then
            table.insert(bullets, '*')
            return BulletList_
          end
          error('missing function ' .. tostring(f))
        end
      }
    )

I wouldn't normally recommend this approach, but I can't think of a
better way right now.

Cheers,
Albert

Lei Zhang writes:

> I am try to write a custom lua script to convert markdown syntax to
> tiddlywiki.
>
> I found the BulletList do not work as expected. You can get the code from
> [0]
>
> function BulletList(items)
>   local buffer = {}
>   for _, item in pairs(items) do
>     table.insert(buffer, "* " .. item)
>   end
>   return table.concat(buffer, "\n")
> end
>
> when render the markdown like below
>
> * test
>   * test2
>     * test3
> * test4
> * test5
>
> by using `pandoc -t md2tid.lua test.md`, i got
>
> * test
>
> * test2
>
> * test3
> * test4
> * test5
>
> But what i expected is
>
> * test
> ** test2
> ** test3
> * test4
> * test5
>
> The issue here is that i have no way to know what indent i should use in
> the BulletList function.
>
> any  guys have idea to improve this? thanks a lot.
>
>
> [0] https://github.com/jeffrey4l/pandoc-addons/blob/master/md2tid.lua#L217


--
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124

Re: how to know the BulletList context and indent properly when using custom lua write.

[Lei Zhang]

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Thanks Albert, 

Your solution works as expected. I pushed a patch to fix my issue [0].

There is another minor issue. There is always extra blank line between the 
nested list. Do you have any idea on how to remove it?

```markdown
1. test0
    1. test1
```


```tiddlywiki
# test0

## test1

```

What i expected

```tiddlywiki
# test0
## test1
```

[0] 
https://github.com/jeffrey4l/pandoc-addons/commit/0071c33686cb1c3db62dac3698a81ad0c793b6ab

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Re: how to know the BulletList context and indent properly when using custom lua write.

[Albert Krewinkel]

Lei Zhang writes:

> There is another minor issue. There is always extra blank line between the
> nested list. Do you have any idea on how to remove it?
>
> ```markdown
> 1. test0
>     1. test1
> ```
>
>
> ```tiddlywiki
> # test0
>
> ## test1
>
> ```
>
> What i expected
>
> ```tiddlywiki
> # test0
> ## test1
> ```

One possibility is to let `Blocksep` return different results whether
one is in a list or not:

    function Blocksep ()
      return bullets[1] and "\n" or "\n\n"
    end


--
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124

Re: how to know the BulletList context and indent properly when using custom lua write.

[Jeffrey Zhang]

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Cool, it works.
You are awesome , thanks a lots.
---
Regards,
Jeffrey Zhang
Blog: http://xcodest.me


On Thu, Dec 26, 2019 at 5:15 PM Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
wrote:

>
> Lei Zhang writes:
>
> > There is another minor issue. There is always extra blank line between
> the
> > nested list. Do you have any idea on how to remove it?
> >
> > ```markdown
> > 1. test0
> >     1. test1
> > ```
> >
> >
> > ```tiddlywiki
> > # test0
> >
> > ## test1
> >
> > ```
> >
> > What i expected
> >
> > ```tiddlywiki
> > # test0
> > ## test1
> > ```
>
> One possibility is to let `Blocksep` return different results whether
> one is in a list or not:
>
>     function Blocksep ()
>       return bullets[1] and "\n" or "\n\n"
>     end
>
>
> --
> Albert Krewinkel
> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124
>
> --
> You received this message because you are subscribed to the Google Groups
> "pandoc-discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/pandoc-discuss/87tv5oqush.fsf%40zeitkraut.de
> .
>

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Re: how to know the BulletList context and indent properly when using custom lua write.

[John MacFarlane]

Instead of just concat'ing a bullet with item, you could
try using match/replace to ensure that subsequent lines
of item are indented 2 spaces.

Lei Zhang <zhang.lei.fly-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> I am try to write a custom lua script to convert markdown syntax to 
> tiddlywiki.
>
> I found the BulletList do not work as expected. You can get the code from 
> [0]
>
> function BulletList(items)
>   local buffer = {}
>   for _, item in pairs(items) do
>     table.insert(buffer, "* " .. item)
>   end
>   return table.concat(buffer, "\n")
> end
>
> when render the markdown like below
>
> * test
>   * test2
>     * test3
> * test4
> * test5
>
> by using `pandoc -t md2tid.lua test.md`, i got 
>
> * test
>
> * test2
>
> * test3
> * test4
> * test5
>
> But what i expected is
>
> * test
> ** test2
> ** test3
> * test4
> * test5
>
> The issue here is that i have no way to know what indent i should use in 
> the BulletList function.
>
> any  guys have idea to improve this? thanks a lot.
>
>
> [0] https://github.com/jeffrey4l/pandoc-addons/blob/master/md2tid.lua#L217
>
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> You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
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Re: how to know the BulletList context and indent properly when using custom lua write.

[Jeffrey Zhang]

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Hi John,

I am not very familiar with pandoc. Could you give a code example?
thanks a lot.
---
Regards,
Jeffrey Zhang
Blog: http://xcodest.me


On Fri, Dec 27, 2019 at 4:22 AM John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:

>
> Instead of just concat'ing a bullet with item, you could
> try using match/replace to ensure that subsequent lines
> of item are indented 2 spaces.
>
> Lei Zhang <zhang.lei.fly-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > I am try to write a custom lua script to convert markdown syntax to
> > tiddlywiki.
> >
> > I found the BulletList do not work as expected. You can get the code
> from
> > [0]
> >
> > function BulletList(items)
> >   local buffer = {}
> >   for _, item in pairs(items) do
> >     table.insert(buffer, "* " .. item)
> >   end
> >   return table.concat(buffer, "\n")
> > end
> >
> > when render the markdown like below
> >
> > * test
> >   * test2
> >     * test3
> > * test4
> > * test5
> >
> > by using `pandoc -t md2tid.lua test.md`, i got
> >
> > * test
> >
> > * test2
> >
> > * test3
> > * test4
> > * test5
> >
> > But what i expected is
> >
> > * test
> > ** test2
> > ** test3
> > * test4
> > * test5
> >
> > The issue here is that i have no way to know what indent i should use in
> > the BulletList function.
> >
> > any  guys have idea to improve this? thanks a lot.
> >
> >
> > [0]
> https://github.com/jeffrey4l/pandoc-addons/blob/master/md2tid.lua#L217
> >
> > --
> > You received this message because you are subscribed to the Google
> Groups "pandoc-discuss" group.
> > To unsubscribe from this group and stop receiving emails from it, send
> an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> > To view this discussion on the web visit
> https://groups.google.com/d/msgid/pandoc-discuss/e249e0e0-d71e-4476-9d1f-12f7d3f2acf5%40googlegroups.com
> .
>

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Re: how to know the BulletList context and indent properly when using custom lua write.

[Diego Mesa]

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Hello,

Did you ever manage to complete the TW5 writer? I am very interested in 
getting TW "plugged in" to pandoc!

Thanks!

On Thursday, December 26, 2019 at 7:38:23 PM UTC-6, Jeffrey Zhang wrote:
>
> Hi John,
>
> I am not very familiar with pandoc. Could you give a code example? 
> thanks a lot.
> ---
> Regards,
> Jeffrey Zhang
> Blog: http://xcodest.me
>
>
> On Fri, Dec 27, 2019 at 4:22 AM John MacFarlane <j...-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org 
> <javascript:>> wrote:
>
>>
>> Instead of just concat'ing a bullet with item, you could
>> try using match/replace to ensure that subsequent lines
>> of item are indented 2 spaces.
>>
>> Lei Zhang <zhang...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org <javascript:>> writes:
>>
>> > I am try to write a custom lua script to convert markdown syntax to 
>> > tiddlywiki.
>> >
>> > I found the BulletList do not work as expected. You can get the code 
>> from 
>> > [0]
>> >
>> > function BulletList(items)
>> >   local buffer = {}
>> >   for _, item in pairs(items) do
>> >     table.insert(buffer, "* " .. item)
>> >   end
>> >   return table.concat(buffer, "\n")
>> > end
>> >
>> > when render the markdown like below
>> >
>> > * test
>> >   * test2
>> >     * test3
>> > * test4
>> > * test5
>> >
>> > by using `pandoc -t md2tid.lua test.md`, i got 
>> >
>> > * test
>> >
>> > * test2
>> >
>> > * test3
>> > * test4
>> > * test5
>> >
>> > But what i expected is
>> >
>> > * test
>> > ** test2
>> > ** test3
>> > * test4
>> > * test5
>> >
>> > The issue here is that i have no way to know what indent i should use 
>> in 
>> > the BulletList function.
>> >
>> > any  guys have idea to improve this? thanks a lot.
>> >
>> >
>> > [0] 
>> https://github.com/jeffrey4l/pandoc-addons/blob/master/md2tid.lua#L217
>> >
>> > -- 
>> > You received this message because you are subscribed to the Google 
>> Groups "pandoc-discuss" group.
>> > To unsubscribe from this group and stop receiving emails from it, send 
>> an email to pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <javascript:>.
>> > To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/pandoc-discuss/e249e0e0-d71e-4476-9d1f-12f7d3f2acf5%40googlegroups.com
>> .
>>
>

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