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%% This is part of OpTeX project, see http://petr.olsak.net/optex

\_fontdecl [Latin Modern] \LMfonts {TeX Gyre fonts based on Coputer Modern}
        {\roman \sans \quotset \ttset \ttprop \ttlight \ttcond \upital 
         \dunhill submods:\caps \slant \nbold \bolder} {\rm \bf \it \bi \tt} {LM}
        {[lmroman10-regular]}

\_wlog{\_detokenize{%
Modifiers (selects subfamily):^^J
 \modreset .. implicit values (serif, bold extended, nocaps)^^J
 \sans ...... sans serif subfamily^^J
 \quotset ... quotation subfamily^^J
 \ttset ..... typewriter subfamily^^J
 \ttprop .... proportional typewriter-like subfamily^^J
 \ttlight ... light typewriter subfamily^^J
 \ttcond .... condensed typewriter subfamily^^J
 \upital .... upright italic (only \rm)^^J
 \dunhill ... dunhill roman subfamily (only \rm, \it)^^J%
Submodifiers (setlects special variants of given subfamily):^^J
 \caps ...... caps & small caps (available only at limited shapes)^^J
 \slant ..... slanted (default in some subfamilies)^^J
 \nbold ..... normal bold (extended bold is default)^^J
 \bolder .... extended bold^^J
}}

\_protected\_def \LMfonts {%
   \_def \_currfamily {LMfonts}%
   \_def \_fontnamegen {[\_optname{lm\_subfamV.\_currV}]:\_fontfeatures}%
   \_resetmod
}

\_def\_LMregfont #1 #2 #3{%
   \_edef\_tmp {\_noexpand\_regoptsizes #1 #2 \_ea\_detokenize\_ea{#3}}%
   \_lowercase\_ea{\_tmp}% OTF file names are lowercase
}
\_def \_regoptFS {5 <5.5 6 <6.5 7 <7.5 8 <8.5 9 <9.5 10 <11.1 12 <15 17 <*}
\_def \_regoptFT {5 <5.5 6 <6.5 7 <7.5 8 <8.5 9 <9.5 10 <11.1 12 <*}
\_def \_regoptST {7 <7.5 8 <8.5 9 <9.5 10 <11.1 12 <*}
\_def \_regoptES {8 <8.5 9 <9.5 10 <11.1 12 <15 17 <*}
\_def \_regoptET {8 <8.5 9 <9.5 10 <11.1 12 <*}
\_def \_regoptT  {10 <*}
\_def \_regoptE  {8 <*}

\_LMregfont lmrm.r     LMRoman?-Regular        \_regoptFS  % 5-17
\_LMregfont lmrm.bx    LMRoman?-Bold           \_regoptFT  % 5-12
\_LMregfont lmrm.i     LMRoman?-Italic         \_regoptST  % 7-12
\_LMregfont lmrm.bxi   LMRoman?-BoldItalic     \_regoptT   % 10
\_LMregfont lmrm.isl   LMRomanSlant?-Regular   \_regoptES  % 8-17
\_LMregfont lmrm.bxisl LMRomanSlant?-Bold      \_regoptT   % 10
\_LMregfont lmrm.b     LMRomanDemi?-Regular    \_regoptT   % 10
\_LMregfont lmrm.bi    LMRomanDemi?-Oblique    \_regoptT   % 10

\_LMregfont lmss.r     LMSans?-Regular          \_regoptES  % 8-17
\_LMregfont lmss.bx    LMSans?-Bold             \_regoptT   % 10
\_LMregfont lmss.i     LMSans?-Oblique          \_regoptES  % 8-17
\_LMregfont lmss.bxi   LMSans?-BoldOblique      \_regoptT   % 10
\_LMregfont lmss.b     LMSansDemiCond?-Regular  \_regoptT   % 10
\_LMregfont lmss.bi    LMSansDemiCond?-Oblique  \_regoptT   % 10

\_LMregfont lmsq.r     LMSansQuot?-Regular      \_regoptE  % 8
\_LMregfont lmsq.b     LMSansQuot?-Bold         \_regoptE  % 8
\_LMregfont lmsq.i     LMSansQuot?-Oblique      \_regoptE  % 8
\_LMregfont lmsq.bi    LMSansQuot?-BoldOblique  \_regoptE  % 8

\_LMregfont lmtt.r     LMMono?-Regular        \_regoptET  % 8-12
\_LMregfont lmtt.b     LMMonoLt?-Bold         \_regoptT   % 10
\_LMregfont lmtt.i     LMMono?-Italic         \_regoptT   % 10
\_LMregfont lmtt.bi    LMMonoLt?-BoldOblique  \_regoptT   % 10
\_LMregfont lmtt.isl   LMMonoSlant?-Regular   \_regoptT   % 10
\_optfontalias {lmtt.bisl} {lmtt.bi} 

\_LMregfont lmtp.r     LMMonoPropLt?-Regular      \_regoptT  % 10
\_LMregfont lmtp.bx    LMMonoPropLt?-Bold         \_regoptT  % 10
\_LMregfont lmtp.i     LMMonoPropLt?-Oblique      \_regoptT  % 10
\_LMregfont lmtp.bxi   LMMonoPropLt?-BoldOblique  \_regoptT  % 10
\_LMregfont lmtp.b     LMMonoProp?-Regular        \_regoptT  % 10
\_LMregfont lmtp.bi    LMMonoProp?-Oblique        \_regoptT  % 10

\_LMregfont lmtl.r     LMMonoLt?-Regular  \_regoptT  % 10
\_LMregfont lmtl.i     LMMonoLt?-Oblique  \_regoptT  % 10

\_LMregfont lmtc.r     LMMonoLtCond?-Regular  \_regoptT  % 10
\_LMregfont lmtc.i     LMMonoLtCond?-Oblique  \_regoptT  % 10

\_LMregfont lmrm.rc    LMRomanCaps?-Regular \_regoptT  % 10
\_LMregfont lmrm.ic    LMRomanCaps?-Oblique \_regoptT  % 10
\_LMregfont lmtt.rc    LMMonoCaps?-Regular  \_regoptT  % 10
\_LMregfont lmtt.ic    LMMonoCaps?-Oblique  \_regoptT  % 10

\_LMregfont lmmu.r     LMRomanUnsl?-Regular    \_regoptT  % 10
\_LMregfont lmdu.r     LMRomanDunh?-Regular    \_regoptT  % 10
\_LMregfont lmdu.sl    LMRomanDunh?-Oblique    \_regoptT  % 10

% main modifiers (they select a subfamily)
\_moddef \resetmod {\_fsetV subfam=rm \_fvars r bx i bxi }
\_moddef \sans     {\_fsetV subfam=ss \_fvars r bx i bxi }
\_moddef \quotset  {\_fsetV subfam=sq \_fvars r b i bi }
\_moddef \ttset    {\_fsetV subfam=tt \_fvars r b i bi }
\_moddef \ttprop   {\_fsetV subfam=tp \_fvars r b i bi }
\_moddef \ttlight  {\_fsetV subfam=tl \_fvars r . i . }
\_moddef \ttcond   {\_fsetV subfam=tc \_fvars r . i . }
\_moddef \upital   {\_fsetV subfam=mu \_fvars r . . . }
\_moddef \dunhill  {\_fsetV subfam=du \_fvars r . sl . }

% submodifiers (they select special vaiants in a subfamily)
\_moddef \nbold    {\_onlyif subfam=rm,ss,tp: {\_fvars r b i bi }}
\_moddef \bolder   {\_onlyif subfam=rm,ss,tp: {\_fvars r bx i bxi }} 
\_moddef \slant    {\_onlyif subfam=rm:       {\_fvars r bx isl bxisl }%
                    \_onlyif subfam=tt:       {\_fvars r b isl bisl }}
\_moddef \caps     {\_onlyif subfam=rm,tt:    {\_fvars rc . ic . }}

\_def \_tryloadtt {\_fontdef\_tentt{\_LMfonts \_addto\_fontfeatures{-tlig;}\_ttset \_rm}} 
\_private \LMfonts \ttset ; % \tt variant selector re-defined

\_initfontfamily % new font family must be initialized

\_loadmath {[latinmodern-math]}

\_endcode

\sec How to wite font-macro-file with optical sizes for \OpTeX/
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

First, look at more clear example in `f-hermes.opm`. The basic documentation
is there.

You can use `\_optname` macro in upur `\_fontnamegen`. This macro is fully
expandable and its input is `<internal-template>` and its output is a
part of your `\_fontnamegen`, i.e. it is a part of a real font file name with
`.otf` extension. Shortly speaking:

\begtt
   \_optname{<internal-template>} -> <part-of-file-name>
\endtt

You can declare a collection of file names for only one
<optical-name-template> by `\_regoptsizes`. The syntax is shown for one real
case:

\begtt
  \_regoptsizes lmr.r lmroman?-regular
     5 <5.5 6 <6.5 7 <7.5 8 <8.5 9 <9.5 10 <11.1 12 <15 17 <* 
\endtt

In general: 

\begtt
   \_regoptsizes <internal-template> {<default-size>} <resizing-data>
\endtt

Suppose our example above. Then `\_optname{lmr.r}` expands to
lmroman?-regular where the question mark is substituted by a number
depending on current `\_optsize`. If the `\_optsize` lies between two boundary
values (they are prefixed by `<` character) then the number written between
them is used. For example if $11.1 \lt \_optsize \_le 15$ then 12 is
substituted instead question mark. The <resizing-data> virtually begins
with zero `<0`, but it is not explicitly written. The right part of
<resizing-data> must be terminated by `<*` which means "less than infinity".

If `\_optname` gets an argument which is not registered <internal-template>
then it expands to `\_failedoptname` which typically ends to error message
about missing font. You can redefine `\_failedoptname` macro to some
existing font if you fint it useful.

We are using a special macro \_LMregfont which sets the file names to
lowercase and enables to use a shortcasts isntead real <resizing-data>.
There are shortcats `\_regoptFS`, `\_regoptT`, etc. here. THe collection of
<internal-templates> are declared, each of them covers a collection of real
file names.

The modifiers redefines \_subfamV and \_currV ouput in this file
`f-lmfonts.opm`. These outputs are used in the paramater of `\_optname`, so
they decalre parts of <internal-template>, no parts of real file name.

The `\optfontalias {<new-template>} {<declared-template>} decales
<new-template> wit the same meaning as previously <declared-template>.

The `\_optname` macro can be used even if no otical sizes are provided by
a font family. Suppose that font file names are much more chaotic (because
artists are very creative people), so you need to declare more systematic
<internal-templates> and do an alias from each <internal-template> to
<real-font-name>. For example, you can do it as folows:

\begtt
   \def\fontalias #1 #2 {\_regoptsizes #1 ?#2 {} <*}
%             alias name           real font name
   \fontalias crea-a-regular       {Creative Font}
   \fontalias crea-a-bold          {Creative FontBold}
   \fontalias crea-a-italic        {Creative olique}
   \fontalias crea-a-bolditalic    {Creative Bold plus italic}
   \fontalias crea-b-regular       {Creative Regular subfam}
   \fontalias crea-b-bold          {Creative subfam bold}
   \fontalias crea-b-italic        {Creative-subfam Oblique}
   \fontalias crea-b-bolditalic    {Creative Bold subfam Oblique}
\endtt