auto_identifiers (-) -> (_)

auto_identifiers (-) -> (_)

[Mehran Baghi]

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The auto_identifiers extension replaces all spaces to hyphens.

https://pandoc.org/MANUAL.html#headings-and-sections

I need it to replace them to underscores to keep my website urls uniform.
I have searched the github repo and couldn't find the extension file to fix 
it myself.
Is it Extensions.hs ? How can I fix it?

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Re: auto_identifiers (-) -> (_)

[John MacFarlane]

The easiest approach would be to use a lua filter to
modify the identifiers added by auto_identifiers.
Then you don't need to modify the Haskell code.

See the documentation on the website for lua filters.
It would be a few lines.

Mehran Baghi <1mehranbaghi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> The auto_identifiers extension replaces all spaces to hyphens.
>
> https://pandoc.org/MANUAL.html#headings-and-sections
>
> I need it to replace them to underscores to keep my website urls uniform.
> I have searched the github repo and couldn't find the extension file to fix 
> it myself.
> Is it Extensions.hs ? How can I fix it?
>
> -- 
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Re: auto_identifiers (-) -> (_)

[Mehran Baghi]

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Thank you Dr. MacFarlane.

The problem with writing a filter to replace (-)s to (_)s is you wouldn't 
know
whether the hyphen was a space and auto_identifiers turned it to a hyphen,
or it was a hyphen in the first place.

Is there any other options?
I don't know any haskell yet, but I guess in this case it would be as easy 
as
changing a character (-) -> (_). I just don't know where to look.

On Tuesday, May 21, 2019 at 9:11:14 PM UTC+4:30, John MacFarlane wrote:
>
>
> The easiest approach would be to use a lua filter to 
> modify the identifiers added by auto_identifiers. 
> Then you don't need to modify the Haskell code. 
>
> See the documentation on the website for lua filters. 
> It would be a few lines. 
>
> Mehran Baghi <1mehra...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org <javascript:>> writes: 
>
> > The auto_identifiers extension replaces all spaces to hyphens. 
> > 
> > https://pandoc.org/MANUAL.html#headings-and-sections 
> > 
> > I need it to replace them to underscores to keep my website urls 
> uniform. 
> > I have searched the github repo and couldn't find the extension file to 
> fix 
> > it myself. 
> > Is it Extensions.hs ? How can I fix it? 
> > 
> > -- 
> > 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 
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> <javascript:>. 
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>
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>

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Re: auto_identifiers (-) -> (_)

[Albert Krewinkel]

Mehran Baghi writes:

> Thank you Dr. MacFarlane.
>
> The problem with writing a filter to replace (-)s to (_)s is you wouldn't
> know
> whether the hyphen was a space and auto_identifiers turned it to a hyphen,
> or it was a hyphen in the first place.
>
> Is there any other options?
> I don't know any haskell yet, but I guess in this case it would be as easy
> as
> changing a character (-) -> (_). I just don't know where to look.

One could go the opposite direction and use a Lua filter to create the
identifiers yourself. Below is an example that, for headers headers
"Hello, World" and "non-negotiable", creates identifiers "hello_world"
and "non-negotiable", respectively.

    string.uc_lower = (require 'text').lower

    function Header (h)
      -- do nothing if the identifier is already set
      if h.identifier ~= '' then return nil end

      h.identifier = pandoc.utils.stringify(h)
        :lower()
        :gsub('[^%w%s%-]', '')
        :gsub('%s', '_')
      return h
    end

See <https://www.lua.org/manual/5.3/manual.html#6.4.1> for more
information on pattern matching in Lua.

HTH,

Albert

Re: auto_identifiers (-) -> (_)

[John MacFarlane]

> The problem with writing a filter to replace (-)s to (_)s is you wouldn't 
> know
> whether the hyphen was a space and auto_identifiers turned it to a hyphen,
> or it was a hyphen in the first place.

Well, then, you could disable auto_identifiers and
have the lua filter add the identifiers, based on
the heading contents, using a scheme of your own choosing.

In the lua filter, use pandoc.utils.stringify to
convert the heading contents to a string.

I don't want to discourage learning Haskell, but
maintaining your own fork of an open-source project
can be a pain. Easier to use filters.

Re: auto_identifiers (-) -> (_)

[Kolen Cheung]

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Why would you want to know that hyphen came from a space or an actual hyphen in the first place? It is supposed to be destructive (I.e. not one one one corresponding.)

And I agree if you want to have full control on the generation process, probably you should either write your own filter or program or write it manually.

Re: auto_identifiers (-) -> (_)

[Mehran Baghi]

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This worked perfectly. I don't know how to thank you Mr. Krewinkel.
I gave you credit in my code:

https://gitlab.com/hott_for_cools/book/blob/master/builder/auto_identifiers_underscore.lua

Thank you again. (and sorry for delayed reply)

On Wednesday, May 22, 2019 at 12:27:50 AM UTC+4:30, Albert Krewinkel wrote:
>
>
> One could go the opposite direction and use a Lua filter to create the 
> identifiers yourself. Below is an example that, for headers headers 
> "Hello, World" and "non-negotiable", creates identifiers "hello_world" 
> and "non-negotiable", respectively. 
>
>     string.uc_lower = (require 'text').lower 
>
>     function Header (h) 
>       -- do nothing if the identifier is already set 
>       if h.identifier ~= '' then return nil end 
>
>       h.identifier = pandoc.utils.stringify(h) 
>         :lower() 
>         :gsub('[^%w%s%-]', '') 
>         :gsub('%s', '_') 
>       return h 
>     end 
>
> See <https://www.lua.org/manual/5.3/manual.html#6.4.1> for more 
> information on pattern matching in Lua. 
>
> HTH, 
>
> Albert 
>

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Re: auto_identifiers (-) -> (_)

[Mehran Baghi]

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Here is an example:

Sometimes hyphens have semantic significance:
"A well-fed pet" -> auto_identifiers -> a-well-fed-pet -> [ filter that 
turns (-) into (_) ] -> a_well_fed_pet
While it should be "a_well-fed_pet"

Underlines are a better replacement for spaces. I wish that was the default
output of auto_identifiers.

Anyway, Albert's code above solves the problem.

On Wednesday, May 22, 2019 at 4:55:18 AM UTC+4:30, Kolen Cheung wrote:
>
> Why would you want to know that hyphen came from a space or an actual 
> hyphen in the first place? It is supposed to be destructive (I.e. not one 
> one one corresponding.)
>
> And I agree if you want to have full control on the generation process, 
> probably you should either write your own filter or program or write it 
> manually.
>

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Re: auto_identifiers (-) -> (_)

[BPJ]

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The English spelling conventions for when you write compound words with a
hyphen, with a space or with neither a hyphen nor a space are totally
arbitrary (you have to learn them on a word-by-word basis) and the
difference seldom affects meaning, and when it does affect meaning, e.g. in
_black bird_ vs. _blackbird_ the compound is usually written as one word.
Thus it hardly matters whether you use underscores or hyphens in
identifiers, and in most programming languages you have no choice: you have
to use underscores or write as one word. In TeX labels it is the other way
around: you have to use hyphens, and since Pandoc auto-identifiers need to
work as TeX labels hyphens is rightly the default. The reason hyphens are
the norm in HTML identifiers is probably that underscores are unfamiliar to
non-programmers, many of whom wouldn't even know how to type them.


Den mån 3 juni 2019 09:27Mehran Baghi <1mehranbaghi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

> Here is an example:
>
> Sometimes hyphens have semantic significance:
> "A well-fed pet" -> auto_identifiers -> a-well-fed-pet -> [ filter that
> turns (-) into (_) ] -> a_well_fed_pet
> While it should be "a_well-fed_pet"
>
> Underlines are a better replacement for spaces. I wish that was the default
> output of auto_identifiers.
>
> Anyway, Albert's code above solves the problem.
>
> On Wednesday, May 22, 2019 at 4:55:18 AM UTC+4:30, Kolen Cheung wrote:
>>
>> Why would you want to know that hyphen came from a space or an actual
>> hyphen in the first place? It is supposed to be destructive (I.e. not one
>> one one corresponding.)
>>
>> And I agree if you want to have full control on the generation process,
>> probably you should either write your own filter or program or write it
>> manually.
>>
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Re: auto_identifiers (-) -> (_)

[Mehran Baghi]

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> The English spelling conventions for when you write compound words with a 
hyphen,
> with a space or with neither a hyphen nor a space are totally arbitrary
> (you have to learn them on a word-by-word basis) and the difference 
seldom affects
> meaning, and when it does affect meaning, e.g. in _black bird_ vs. 
_blackbird_
> the compound is usually written as one word.

I agree.

> Thus it hardly matters whether you use underscores or hyphens in 
identifiers

I think underlines are a better replacement for spaces,
not just in identifiers, but also in URLs, filenames, etc.
Consider this wikipedia entry for "Claude-Louis Navier":

https://en.wikipedia.org/wiki/Claude-Louis_Navier

If wikipedia had chosen hyphens as a delimiter, it would have become:

https://en.wikipedia.org/wiki/Claude-Louis-Navier

I do prefer the first one and I'm not sure that this is just a matter of 
taste.

> in most programming languages you have no choice: you have to
> use underscores or write as one word.

I'm not sure what you're referring to. (variable names?)

> In TeX labels it is the other way around: you have to use hyphens, and 
since
> Pandoc auto-identifiers need to work as TeX labels hyphens is rightly the 
default.

Yes, underscores in TeX labels can cause complications and there are 
workarounds:
https://tex.stackexchange.com/questions/121416/putting-an-underscore-in-a-label

> The reason hyphens are the norm in HTML identifiers is probably that 
underscores
> are unfamiliar to non-programmers, many of whom wouldn't even know how to 
type them.

Are they? I don't know about that, wikipedia is an example of a
popular website using underscores.

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