pandoc/test/command/4742.md
John MacFarlane c647948ff1 commonmark_x: replace auto_identifiers with gfm_auto_identifiers.
`commonmark_x` never actually supported `auto_identifiers` (it
didn't do anything), because the underlying library implements
gfm-style identifiers only.

Attempts to add the `autolink_identifiers` extension to
`commonmark` will now fail with an error.

Closes #6863.
2020-11-20 09:17:14 -08:00

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Check that the commonmark reader handles the `ascii_identifiers`
extension properly.
```
% pandoc -f commonmark+gfm_auto_identifiers+ascii_identifiers -t native
# non ascii ⚠️ räksmörgås
^D
[Header 1 ("non-ascii--raksmorgas",[],[]) [Str "non",Space,Str "ascii",Space,Str "\9888\65039",Space,Str "r\228ksm\246rg\229s"]]
```
Note that the emoji here is actually a composite character,
formed from \9888 and \65039. The latter is a combining mark,
so it survives...
```
% pandoc -f commonmark+gfm_auto_identifiers-ascii_identifiers -t native
# non ascii ⚠️ räksmörgås
^D
[Header 1 ("non-ascii-\65039-r\228ksm\246rg\229s",[],[]) [Str "non",Space,Str "ascii",Space,Str "\9888\65039",Space,Str "r\228ksm\246rg\229s"]]
```
`gfm` should have `ascii_identifiers` disabled by default.
```
% pandoc -f gfm -t native
# non ascii ⚠️ räksmörgås
^D
[Header 1 ("non-ascii-\65039-r\228ksm\246rg\229s",[],[]) [Str "non",Space,Str "ascii",Space,Str "\9888\65039",Space,Str "r\228ksm\246rg\229s"]]
```