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Supporting optional underscores for italics

1. John Cowan (cowan (a) ccil.org)

Given that we are *not* going to change the definition of text/gemini, but
that many people want italics (including me), I have prepared some
instructions aimed at programmers of client software who would like to
support the _underscore emphasis_ convention.

0.  Under no circumstances are underscores to be removed from the text.
That compensates for less-than-infallible algorithms.

1.  If an underscore appears outside an emphasized text section, and is at
the beginning of a text line or after the # characters in a header line, or
is preceded by a whitespace character, then it marks the beginning of an
emphasized-text section (rendered as italics or in some other way).

2.  If an underscore appears inside an emphasized text section, and is at
the end of a line, or is followed by whitespace, sentence-terminating
punctuation, or parenthesis- or quotation-terminating punctuation, then it
marks the end of the emphasized-text section.

These rules exclude underscores in things like snake_case_variables, while
supporting most actual uses.

3.  An emphasized-text section ends unconditionally at the end of a line.

The attached file specifies all the Unicode whitespace and terminating
punctuation, from the Unicode Character Database.  There are quite a few,
but you don't even need a regular expression, just a list of the characters.

I hope this is helpful and/or inspirational.




John Cowan          http://vrici.lojban.org/~cowan        cowan at ccil.org
People go through the bother of Christmas because Christmas helps them
to understand why they go through the bother of living out their lives
the rest of the year. For one brief instant, we see human society as it
should and could be, a world in which business has become the exchanging
of presents and in which nothing is important except the happiness and
well-being of the ultimate consumer.  --Northrop Frye (1948)
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0009..000D    ; White_Space # Cc   [5] <control-0009>..<control-000D>
0020          ; White_Space # Zs       SPACE
0085          ; White_Space # Cc       <control-0085>
00A0          ; White_Space # Zs       NO-BREAK SPACE
1680          ; White_Space # Zs       OGHAM SPACE MARK
2000..200A    ; White_Space # Zs  [11] EN QUAD..HAIR SPACE
2028          ; White_Space # Zl       LINE SEPARATOR
2029          ; White_Space # Zp       PARAGRAPH SEPARATOR
202F          ; White_Space # Zs       NARROW NO-BREAK SPACE
205F          ; White_Space # Zs       MEDIUM MATHEMATICAL SPACE
3000          ; White_Space # Zs       IDEOGRAPHIC SPACE

# Total code points: 25

# ================================================

0021          ; STerm # Po       EXCLAMATION MARK
003F          ; STerm # Po       QUESTION MARK
0589          ; STerm # Po       ARMENIAN FULL STOP
061E..061F    ; STerm # Po   [2] ARABIC TRIPLE DOT PUNCTUATION MARK..ARABIC QUESTION MARK
06D4          ; STerm # Po       ARABIC FULL STOP
0700..0702    ; STerm # Po   [3] SYRIAC END OF PARAGRAPH..SYRIAC SUBLINEAR FULL STOP
07F9          ; STerm # Po       NKO EXCLAMATION MARK
0837          ; STerm # Po       SAMARITAN PUNCTUATION MELODIC QITSA
0839          ; STerm # Po       SAMARITAN PUNCTUATION QITSA
083D..083E    ; STerm # Po   [2] SAMARITAN PUNCTUATION SOF 
MASHFAAT..SAMARITAN PUNCTUATION ANNAAU
0964..0965    ; STerm # Po   [2] DEVANAGARI DANDA..DEVANAGARI DOUBLE DANDA
104A..104B    ; STerm # Po   [2] MYANMAR SIGN LITTLE SECTION..MYANMAR SIGN SECTION
1362          ; STerm # Po       ETHIOPIC FULL STOP
1367..1368    ; STerm # Po   [2] ETHIOPIC QUESTION MARK..ETHIOPIC PARAGRAPH SEPARATOR
166E          ; STerm # Po       CANADIAN SYLLABICS FULL STOP
1735..1736    ; STerm # Po   [2] PHILIPPINE SINGLE PUNCTUATION..PHILIPPINE 
DOUBLE PUNCTUATION
1803          ; STerm # Po       MONGOLIAN FULL STOP
1809          ; STerm # Po       MONGOLIAN MANCHU FULL STOP
1944..1945    ; STerm # Po   [2] LIMBU EXCLAMATION MARK..LIMBU QUESTION MARK
1AA8..1AAB    ; STerm # Po   [4] TAI THAM SIGN KAAN..TAI THAM SIGN SATKAANKUU
1B5A..1B5B    ; STerm # Po   [2] BALINESE PANTI..BALINESE PAMADA
1B5E..1B5F    ; STerm # Po   [2] BALINESE CARIK SIKI..BALINESE CARIK PAREREN
1C3B..1C3C    ; STerm # Po   [2] LEPCHA PUNCTUATION TA-ROL..LEPCHA 
PUNCTUATION NYET THYOOM TA-ROL
1C7E..1C7F    ; STerm # Po   [2] OL CHIKI PUNCTUATION MUCAAD..OL CHIKI 
PUNCTUATION DOUBLE MUCAAD
203C..203D    ; STerm # Po   [2] DOUBLE EXCLAMATION MARK..INTERROBANG
2047..2049    ; STerm # Po   [3] DOUBLE QUESTION MARK..EXCLAMATION QUESTION MARK
2E2E          ; STerm # Po       REVERSED QUESTION MARK
2E3C          ; STerm # Po       STENOGRAPHIC FULL STOP
3002          ; STerm # Po       IDEOGRAPHIC FULL STOP
A4FF          ; STerm # Po       LISU PUNCTUATION FULL STOP
A60E..A60F    ; STerm # Po   [2] VAI FULL STOP..VAI QUESTION MARK
A6F3          ; STerm # Po       BAMUM FULL STOP
A6F7          ; STerm # Po       BAMUM QUESTION MARK
A876..A877    ; STerm # Po   [2] PHAGS-PA MARK SHAD..PHAGS-PA MARK DOUBLE SHAD
A8CE..A8CF    ; STerm # Po   [2] SAURASHTRA DANDA..SAURASHTRA DOUBLE DANDA
A92F          ; STerm # Po       KAYAH LI SIGN SHYA
A9C8..A9C9    ; STerm # Po   [2] JAVANESE PADA LINGSA..JAVANESE PADA LUNGSI
AA5D..AA5F    ; STerm # Po   [3] CHAM PUNCTUATION DANDA..CHAM PUNCTUATION TRIPLE DANDA
AAF0..AAF1    ; STerm # Po   [2] MEETEI MAYEK CHEIKHAN..MEETEI MAYEK AHANG KHUDAM
ABEB          ; STerm # Po       MEETEI MAYEK CHEIKHEI
FE56..FE57    ; STerm # Po   [2] SMALL QUESTION MARK..SMALL EXCLAMATION MARK
FF01          ; STerm # Po       FULLWIDTH EXCLAMATION MARK
FF1F          ; STerm # Po       FULLWIDTH QUESTION MARK
FF61          ; STerm # Po       HALFWIDTH IDEOGRAPHIC FULL STOP
10A56..10A57  ; STerm # Po   [2] KHAROSHTHI PUNCTUATION DANDA..KHAROSHTHI 
PUNCTUATION DOUBLE DANDA
10F55..10F59  ; STerm # Po   [5] SOGDIAN PUNCTUATION TWO VERTICAL 
BARS..SOGDIAN PUNCTUATION HALF CIRCLE WITH DOT
11047..11048  ; STerm # Po   [2] BRAHMI DANDA..BRAHMI DOUBLE DANDA
110BE..110C1  ; STerm # Po   [4] KAITHI SECTION MARK..KAITHI DOUBLE DANDA
11141..11143  ; STerm # Po   [3] CHAKMA DANDA..CHAKMA QUESTION MARK
111C5..111C6  ; STerm # Po   [2] SHARADA DANDA..SHARADA DOUBLE DANDA
111CD         ; STerm # Po       SHARADA SUTRA MARK
111DE..111DF  ; STerm # Po   [2] SHARADA SECTION MARK-1..SHARADA SECTION MARK-2
11238..11239  ; STerm # Po   [2] KHOJKI DANDA..KHOJKI DOUBLE DANDA
1123B..1123C  ; STerm # Po   [2] KHOJKI SECTION MARK..KHOJKI DOUBLE SECTION MARK
112A9         ; STerm # Po       MULTANI SECTION MARK
1144B..1144C  ; STerm # Po   [2] NEWA DANDA..NEWA DOUBLE DANDA
115C2..115C3  ; STerm # Po   [2] SIDDHAM DANDA..SIDDHAM DOUBLE DANDA
115C9..115D7  ; STerm # Po  [15] SIDDHAM END OF TEXT MARK..SIDDHAM SECTION 
MARK WITH CIRCLES AND FOUR ENCLOSURES
11641..11642  ; STerm # Po   [2] MODI DANDA..MODI DOUBLE DANDA
1173C..1173E  ; STerm # Po   [3] AHOM SIGN SMALL SECTION..AHOM SIGN RULAI
11944         ; STerm # Po       DIVES AKURU DOUBLE DANDA
11946         ; STerm # Po       DIVES AKURU END OF TEXT MARK
11A42..11A43  ; STerm # Po   [2] ZANABAZAR SQUARE MARK SHAD..ZANABAZAR 
SQUARE MARK DOUBLE SHAD
11A9B..11A9C  ; STerm # Po   [2] SOYOMBO MARK SHAD..SOYOMBO MARK DOUBLE SHAD
11C41..11C42  ; STerm # Po   [2] BHAIKSUKI DANDA..BHAIKSUKI DOUBLE DANDA
11EF7..11EF8  ; STerm # Po   [2] MAKASAR PASSIMBANG..MAKASAR END OF SECTION
16A6E..16A6F  ; STerm # Po   [2] MRO DANDA..MRO DOUBLE DANDA
16AF5         ; STerm # Po       BASSA VAH FULL STOP
16B37..16B38  ; STerm # Po   [2] PAHAWH HMONG SIGN VOS THOM..PAHAWH HMONG 
SIGN VOS TSHAB CEEB
16B44         ; STerm # Po       PAHAWH HMONG SIGN XAUS
16E98         ; STerm # Po       MEDEFAIDRIN FULL STOP
1BC9F         ; STerm # Po       DUPLOYAN PUNCTUATION CHINOOK FULL STOP
1DA88         ; STerm # Po       SIGNWRITING FULL STOP

# Total code points: 140

# ================================================

0022          ; Close # Po       QUOTATION MARK
0027          ; Close # Po       APOSTROPHE
0028          ; Close # Ps       LEFT PARENTHESIS
0029          ; Close # Pe       RIGHT PARENTHESIS
005B          ; Close # Ps       LEFT SQUARE BRACKET
005D          ; Close # Pe       RIGHT SQUARE BRACKET
007B          ; Close # Ps       LEFT CURLY BRACKET
007D          ; Close # Pe       RIGHT CURLY BRACKET
00AB          ; Close # Pi       LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
00BB          ; Close # Pf       RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
0F3A          ; Close # Ps       TIBETAN MARK GUG RTAGS GYON
0F3B          ; Close # Pe       TIBETAN MARK GUG RTAGS GYAS
0F3C          ; Close # Ps       TIBETAN MARK ANG KHANG GYON
0F3D          ; Close # Pe       TIBETAN MARK ANG KHANG GYAS
169B          ; Close # Ps       OGHAM FEATHER MARK
169C          ; Close # Pe       OGHAM REVERSED FEATHER MARK
2018          ; Close # Pi       LEFT SINGLE QUOTATION MARK
2019          ; Close # Pf       RIGHT SINGLE QUOTATION MARK
201A          ; Close # Ps       SINGLE LOW-9 QUOTATION MARK
201B..201C    ; Close # Pi   [2] SINGLE HIGH-REVERSED-9 QUOTATION 
MARK..LEFT DOUBLE QUOTATION MARK
201D          ; Close # Pf       RIGHT DOUBLE QUOTATION MARK
201E          ; Close # Ps       DOUBLE LOW-9 QUOTATION MARK
201F          ; Close # Pi       DOUBLE HIGH-REVERSED-9 QUOTATION MARK
2039          ; Close # Pi       SINGLE LEFT-POINTING ANGLE QUOTATION MARK
203A          ; Close # Pf       SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
2045          ; Close # Ps       LEFT SQUARE BRACKET WITH QUILL
2046          ; Close # Pe       RIGHT SQUARE BRACKET WITH QUILL
207D          ; Close # Ps       SUPERSCRIPT LEFT PARENTHESIS
207E          ; Close # Pe       SUPERSCRIPT RIGHT PARENTHESIS
208D          ; Close # Ps       SUBSCRIPT LEFT PARENTHESIS
208E          ; Close # Pe       SUBSCRIPT RIGHT PARENTHESIS
2308          ; Close # Ps       LEFT CEILING
2309          ; Close # Pe       RIGHT CEILING
230A          ; Close # Ps       LEFT FLOOR
230B          ; Close # Pe       RIGHT FLOOR
2329          ; Close # Ps       LEFT-POINTING ANGLE BRACKET
232A          ; Close # Pe       RIGHT-POINTING ANGLE BRACKET
275B..2760    ; Close # So   [6] HEAVY SINGLE TURNED COMMA QUOTATION MARK 
ORNAMENT..HEAVY LOW DOUBLE COMMA QUOTATION MARK ORNAMENT
2768          ; Close # Ps       MEDIUM LEFT PARENTHESIS ORNAMENT
2769          ; Close # Pe       MEDIUM RIGHT PARENTHESIS ORNAMENT
276A          ; Close # Ps       MEDIUM FLATTENED LEFT PARENTHESIS ORNAMENT
276B          ; Close # Pe       MEDIUM FLATTENED RIGHT PARENTHESIS ORNAMENT
276C          ; Close # Ps       MEDIUM LEFT-POINTING ANGLE BRACKET ORNAMENT
276D          ; Close # Pe       MEDIUM RIGHT-POINTING ANGLE BRACKET ORNAMENT
276E          ; Close # Ps       HEAVY LEFT-POINTING ANGLE QUOTATION MARK ORNAMENT
276F          ; Close # Pe       HEAVY RIGHT-POINTING ANGLE QUOTATION MARK ORNAMENT
2770          ; Close # Ps       HEAVY LEFT-POINTING ANGLE BRACKET ORNAMENT
2771          ; Close # Pe       HEAVY RIGHT-POINTING ANGLE BRACKET ORNAMENT
2772          ; Close # Ps       LIGHT LEFT TORTOISE SHELL BRACKET ORNAMENT
2773          ; Close # Pe       LIGHT RIGHT TORTOISE SHELL BRACKET ORNAMENT
2774          ; Close # Ps       MEDIUM LEFT CURLY BRACKET ORNAMENT
2775          ; Close # Pe       MEDIUM RIGHT CURLY BRACKET ORNAMENT
27C5          ; Close # Ps       LEFT S-SHAPED BAG DELIMITER
27C6          ; Close # Pe       RIGHT S-SHAPED BAG DELIMITER
27E6          ; Close # Ps       MATHEMATICAL LEFT WHITE SQUARE BRACKET
27E7          ; Close # Pe       MATHEMATICAL RIGHT WHITE SQUARE BRACKET
27E8          ; Close # Ps       MATHEMATICAL LEFT ANGLE BRACKET
27E9          ; Close # Pe       MATHEMATICAL RIGHT ANGLE BRACKET
27EA          ; Close # Ps       MATHEMATICAL LEFT DOUBLE ANGLE BRACKET
27EB          ; Close # Pe       MATHEMATICAL RIGHT DOUBLE ANGLE BRACKET
27EC          ; Close # Ps       MATHEMATICAL LEFT WHITE TORTOISE SHELL BRACKET
27ED          ; Close # Pe       MATHEMATICAL RIGHT WHITE TORTOISE SHELL BRACKET
27EE          ; Close # Ps       MATHEMATICAL LEFT FLATTENED PARENTHESIS
27EF          ; Close # Pe       MATHEMATICAL RIGHT FLATTENED PARENTHESIS
2983          ; Close # Ps       LEFT WHITE CURLY BRACKET
2984          ; Close # Pe       RIGHT WHITE CURLY BRACKET
2985          ; Close # Ps       LEFT WHITE PARENTHESIS
2986          ; Close # Pe       RIGHT WHITE PARENTHESIS
2987          ; Close # Ps       Z NOTATION LEFT IMAGE BRACKET
2988          ; Close # Pe       Z NOTATION RIGHT IMAGE BRACKET
2989          ; Close # Ps       Z NOTATION LEFT BINDING BRACKET
298A          ; Close # Pe       Z NOTATION RIGHT BINDING BRACKET
298B          ; Close # Ps       LEFT SQUARE BRACKET WITH UNDERBAR
298C          ; Close # Pe       RIGHT SQUARE BRACKET WITH UNDERBAR
298D          ; Close # Ps       LEFT SQUARE BRACKET WITH TICK IN TOP CORNER
298E          ; Close # Pe       RIGHT SQUARE BRACKET WITH TICK IN BOTTOM CORNER
298F          ; Close # Ps       LEFT SQUARE BRACKET WITH TICK IN BOTTOM CORNER
2990          ; Close # Pe       RIGHT SQUARE BRACKET WITH TICK IN TOP CORNER
2991          ; Close # Ps       LEFT ANGLE BRACKET WITH DOT
2992          ; Close # Pe       RIGHT ANGLE BRACKET WITH DOT
2993          ; Close # Ps       LEFT ARC LESS-THAN BRACKET
2994          ; Close # Pe       RIGHT ARC GREATER-THAN BRACKET
2995          ; Close # Ps       DOUBLE LEFT ARC GREATER-THAN BRACKET
2996          ; Close # Pe       DOUBLE RIGHT ARC LESS-THAN BRACKET
2997          ; Close # Ps       LEFT BLACK TORTOISE SHELL BRACKET
2998          ; Close # Pe       RIGHT BLACK TORTOISE SHELL BRACKET
29D8          ; Close # Ps       LEFT WIGGLY FENCE
29D9          ; Close # Pe       RIGHT WIGGLY FENCE
29DA          ; Close # Ps       LEFT DOUBLE WIGGLY FENCE
29DB          ; Close # Pe       RIGHT DOUBLE WIGGLY FENCE
29FC          ; Close # Ps       LEFT-POINTING CURVED ANGLE BRACKET
29FD          ; Close # Pe       RIGHT-POINTING CURVED ANGLE BRACKET
2E00..2E01    ; Close # Po   [2] RIGHT ANGLE SUBSTITUTION MARKER..RIGHT 
ANGLE DOTTED SUBSTITUTION MARKER
2E02          ; Close # Pi       LEFT SUBSTITUTION BRACKET
2E03          ; Close # Pf       RIGHT SUBSTITUTION BRACKET
2E04          ; Close # Pi       LEFT DOTTED SUBSTITUTION BRACKET
2E05          ; Close # Pf       RIGHT DOTTED SUBSTITUTION BRACKET
2E06..2E08    ; Close # Po   [3] RAISED INTERPOLATION MARKER..DOTTED TRANSPOSITION MARKER
2E09          ; Close # Pi       LEFT TRANSPOSITION BRACKET
2E0A          ; Close # Pf       RIGHT TRANSPOSITION BRACKET
2E0B          ; Close # Po       RAISED SQUARE
2E0C          ; Close # Pi       LEFT RAISED OMISSION BRACKET
2E0D          ; Close # Pf       RIGHT RAISED OMISSION BRACKET
2E1C          ; Close # Pi       LEFT LOW PARAPHRASE BRACKET
2E1D          ; Close # Pf       RIGHT LOW PARAPHRASE BRACKET
2E20          ; Close # Pi       LEFT VERTICAL BAR WITH QUILL
2E21          ; Close # Pf       RIGHT VERTICAL BAR WITH QUILL
2E22          ; Close # Ps       TOP LEFT HALF BRACKET
2E23          ; Close # Pe       TOP RIGHT HALF BRACKET
2E24          ; Close # Ps       BOTTOM LEFT HALF BRACKET
2E25          ; Close # Pe       BOTTOM RIGHT HALF BRACKET
2E26          ; Close # Ps       LEFT SIDEWAYS U BRACKET
2E27          ; Close # Pe       RIGHT SIDEWAYS U BRACKET
2E28          ; Close # Ps       LEFT DOUBLE PARENTHESIS
2E29          ; Close # Pe       RIGHT DOUBLE PARENTHESIS
2E42          ; Close # Ps       DOUBLE LOW-REVERSED-9 QUOTATION MARK
3008          ; Close # Ps       LEFT ANGLE BRACKET
3009          ; Close # Pe       RIGHT ANGLE BRACKET
300A          ; Close # Ps       LEFT DOUBLE ANGLE BRACKET
300B          ; Close # Pe       RIGHT DOUBLE ANGLE BRACKET
300C          ; Close # Ps       LEFT CORNER BRACKET
300D          ; Close # Pe       RIGHT CORNER BRACKET
300E          ; Close # Ps       LEFT WHITE CORNER BRACKET
300F          ; Close # Pe       RIGHT WHITE CORNER BRACKET
3010          ; Close # Ps       LEFT BLACK LENTICULAR BRACKET
3011          ; Close # Pe       RIGHT BLACK LENTICULAR BRACKET
3014          ; Close # Ps       LEFT TORTOISE SHELL BRACKET
3015          ; Close # Pe       RIGHT TORTOISE SHELL BRACKET
3016          ; Close # Ps       LEFT WHITE LENTICULAR BRACKET
3017          ; Close # Pe       RIGHT WHITE LENTICULAR BRACKET
3018          ; Close # Ps       LEFT WHITE TORTOISE SHELL BRACKET
3019          ; Close # Pe       RIGHT WHITE TORTOISE SHELL BRACKET
301A          ; Close # Ps       LEFT WHITE SQUARE BRACKET
301B          ; Close # Pe       RIGHT WHITE SQUARE BRACKET
301D          ; Close # Ps       REVERSED DOUBLE PRIME QUOTATION MARK
301E..301F    ; Close # Pe   [2] DOUBLE PRIME QUOTATION MARK..LOW DOUBLE 
PRIME QUOTATION MARK
FD3E          ; Close # Pe       ORNATE LEFT PARENTHESIS
FD3F          ; Close # Ps       ORNATE RIGHT PARENTHESIS
FE17          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT WHITE 
LENTICULAR BRACKET
FE18          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT 
WHITE LENTICULAR BRAKCET
FE35          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT PARENTHESIS
FE36          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT PARENTHESIS
FE37          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT CURLY BRACKET
FE38          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT CURLY BRACKET
FE39          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT 
TORTOISE SHELL BRACKET
FE3A          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT 
TORTOISE SHELL BRACKET
FE3B          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT BLACK 
LENTICULAR BRACKET
FE3C          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT 
BLACK LENTICULAR BRACKET
FE3D          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT DOUBLE ANGLE BRACKET
FE3E          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT 
DOUBLE ANGLE BRACKET
FE3F          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT ANGLE BRACKET
FE40          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT ANGLE BRACKET
FE41          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT CORNER BRACKET
FE42          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT CORNER BRACKET
FE43          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT WHITE CORNER BRACKET
FE44          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT 
WHITE CORNER BRACKET
FE47          ; Close # Ps       PRESENTATION FORM FOR VERTICAL LEFT SQUARE BRACKET
FE48          ; Close # Pe       PRESENTATION FORM FOR VERTICAL RIGHT SQUARE BRACKET
FE59          ; Close # Ps       SMALL LEFT PARENTHESIS
FE5A          ; Close # Pe       SMALL RIGHT PARENTHESIS
FE5B          ; Close # Ps       SMALL LEFT CURLY BRACKET
FE5C          ; Close # Pe       SMALL RIGHT CURLY BRACKET
FE5D          ; Close # Ps       SMALL LEFT TORTOISE SHELL BRACKET
FE5E          ; Close # Pe       SMALL RIGHT TORTOISE SHELL BRACKET
FF08          ; Close # Ps       FULLWIDTH LEFT PARENTHESIS
FF09          ; Close # Pe       FULLWIDTH RIGHT PARENTHESIS
FF3B          ; Close # Ps       FULLWIDTH LEFT SQUARE BRACKET
FF3D          ; Close # Pe       FULLWIDTH RIGHT SQUARE BRACKET
FF5B          ; Close # Ps       FULLWIDTH LEFT CURLY BRACKET
FF5D          ; Close # Pe       FULLWIDTH RIGHT CURLY BRACKET
FF5F          ; Close # Ps       FULLWIDTH LEFT WHITE PARENTHESIS
FF60          ; Close # Pe       FULLWIDTH RIGHT WHITE PARENTHESIS
FF62          ; Close # Ps       HALFWIDTH LEFT CORNER BRACKET
FF63          ; Close # Pe       HALFWIDTH RIGHT CORNER BRACKET
1F676..1F678  ; Close # So   [3] SANS-SERIF HEAVY DOUBLE TURNED COMMA 
QUOTATION MARK ORNAMENT..SANS-SERIF HEAVY LOW DOUBLE COMMA QUOTATION MARK ORNAMENT

# Total code points: 187

Link to individual message.

2. Drew DeVault (sir (a) cmpwn.com)

Can you guys give it a rest already? NACK on behalf of my client. Gemini
is good because it's not going to change. We don't need italics for
"serious writing". Everyone has something different that they NEED very
BADLY or else they can't SERIOUSLY use gemini, yak, yak, yak.

Stop it.

Gemini is good because it's simple.

Link to individual message.

3. John Cowan (cowan (a) ccil.org)

On Thu, Nov 12, 2020 at 8:07 PM Drew DeVault <sir at cmpwn.com> wrote:

Stop it.
>

Y'know, if you hadn't written your message, I wouldn't have written this
reply and that would be two less messages on the list.  But knock yourself
out.

Gemini is good because it's simple.
>

I agree.  Some clients are bare-bones, others add all sorts of bells and
whistles.  That doesn't affect the simplicity of the protocol *or* the
format.



John Cowan          http://vrici.lojban.org/~cowan        cowan at ccil.org
The penguin geeks is happy / As under the waves they lark
The closed-source geeks ain't happy / They sad cause they in the dark
But geeks in the dark is lucky / They in for a worser treat
One day when the Borg go belly-up / Guess who wind up on the street.
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Link to individual message.

4. Sean Conner (sean (a) conman.org)


  Oooh!  A bike sheeding thread!  I know Drew DeVault might complain, but
hey, this list wouldn't be this list unless the majority of messages were
about text formatting (seriously---over half the messages are not about the
protocol at all, but about text formatting).

  So with my introduction out of the way, let me nitpick [1] this proposal
with a bunch of corner cases I can already see ...

It was thus said that the Great John Cowan once stated:
> Given that we are *not* going to change the definition of text/gemini, but
                    ^^^^^ shouldn't that be _not_?  Or are you going for
strong emphasis here?  

> 1.  If an underscore appears outside an emphasized text section, and is at
> the beginning of a text line or after the # characters in a header line, or
> is preceded by a whitespace character, then it marks the beginning of an
> emphasized-text section

  Pattern wise, it's like:

	(start_of_line ?('#'*) | whitespace) '_'

> (rendered as italics or in some other way).

  Such as bold, a larger font, a smaller font, or some other way other than
using italics.  Okay, got it.  

> 2.  If an underscore appears inside an emphasized text section, and is at
> the end of a line, or is followed by whitespace, sentence-terminating
> punctuation, or parenthesis- or quotation-terminating punctuation, then it
> marks the end of the emphasized-text section.

  I've found that terminating italic sections before sentence-terminating
punctuation can lead to very ugly output.  For example:

	He asked about _blandit_?

  Here, the italic t will run into the trailing question mark, which I feel
looks terrible.  That's why I tend to include sentence terminating marks
within the italic section:

	He asked about _blandit?_

This is of less concern with periods and commas, since there isn't much of a
difference, stylistic wise, between a normal period and italic period.

  It also sounds like you are expecting users to write stuff like

	_lorem ipsum dolor sit amet_

or

	_lorem_ipsum_dolor_sit_amet_

else, why not just say that once in an emphasized text section, the next
underscore ends it.  Much easier to deal with, and a bit easier to deal with
when wrapping text (although I suppose one can add '_' to the list, along
with whitespace and hypens).

> These rules exclude underscores in things like snake_case_variables, while
> supporting most actual uses.
> 
> 3.  An emphasized-text section ends unconditionally at the end of a line.

  Odd, but I can see why you say so, given the nature of parsing gemtext. 
But one unaware of that might end up writing:

	blah blabh _lorem ipsum dolor
	sit amet_ blah blah blah

  and wonder why the italicised text is all wrong.

> The attached file specifies all the Unicode whitespace and terminating
> punctuation, from the Unicode Character Database.  There are quite a few,
> but you don't even need a regular expression, just a list of the characters.

  All 352 of the characters.  

  For now.

  That might be updated at the next Unicode revision.

  Got it.

> I hope this is helpful and/or inspirational.

  -spc (Unicode is hard!  Let's do rocketry!)

[1]	Can we still say that term?

Link to individual message.

5. John Cowan (cowan (a) ccil.org)

On Thu, Nov 12, 2020 at 9:02 PM Sean Conner <sean at conman.org> wrote:

  Oooh!  A bike sheeding thread!


Yup.  Let's sheed some bikes together!

> So with my introduction out of the way, let me nitpick [1]


Yes, you can say that.  Head lice do not yet have a pressure group
insisting that you call their eggs something more polite.

> t> Given that we are *not* going to change the definition of text/gemini,
> but
>                     ^^^^^ shouldn't that be _not_?  Or are you going for
> strong emphasis here?
>

No, just habit.  I write a *lot* of git-flavored Markdown.

>   I've found that terminating italic sections before sentence-terminating
> punctuation can lead to very ugly output.


Yes, though that's up to the content author.  But this isn't about
terminating the italic section; it's about deciding whether an underscore
actually does terminate it.  See below.

> why not just say that once in an emphasized text section, the next
> underscore ends it.


So that lines like "It is important to understand that _although the
standard in C is to use snake_case for variables, C compilers do not
support numbers like 123_456_789_." are interpreted correctly.  To put it
in HTML terms, the first underscore is preceded by whitespace, so it is an
<i>, and the last one is followed by terminating punctuation, so it is an
</i>.  The others, however, don't satisfy either rule 1 or rule 2, so the
emphatic text just goes on right through them.

>         blah blabh _lorem ipsum dolor
>         sit amet_ blah blah blah
>

They will quickly find out that that doesn't work.  Text/gemini lines are
typically used in prose for paragraphs, and italic text doesn't normally
cross paragraph boundaries.

>   That might be updated at the next Unicode revision.
>

That's true.  But as time goes by, the new scripts with script-specific
punctuation become fewer and harder to find.  Until we join the Galactic
Federation, there just aren't many more scripts out there.  Newly invented
ones tend to use Latin/Greek/Cyrillic/etc. punctuation.


>   -spc (Unicode is hard!  Let's do rocketry!)
>

You kidding?  This is one of the easy bits!  All the work has been done for
us.  We don't even need regular expressions to figure it out, just keep the
352 characters in two arrays.  Unless your browser runs on an Arduino, that
is practically free.



John Cowan          http://vrici.lojban.org/~cowan        cowan at ccil.org
I amar prestar aen, han mathon ne nen,    http://vrici.lojban.org/~cowan
han mathon ne chae, a han noston ne 'wilith.  --Galadriel, LOTR:FOTR
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