doc/src/rst.im

.if false
==================================================================================
	Copyright (c) 2019-2020 Nokia
	Copyright (c) 2018-2020 AT&T Intellectual Property.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================================
.fi

.if false
	Mnemonic:	rts.im
	Abstract:	This file provides macros allowing {X}fm source to generate
				rts input from {X}fm source when the doc is passed through
				tfm, and to generate postscirpt output when passed through
				pfm. Simalar to the roff.im macro set that allows the generation
				of troff input for man pages.

	Author:		E. Scott Daniels
	Date:		7 February 2019


		Maybe useful (but doesn't explain why real formatters aren't being used)
		http://docutils.sourceforge.net/docs/user/rst/quickref.html
.fi


	.** convert {X}fm input into rts.
	.** post processing is needed to strip the leading space that tfm insists on adding.

	.** character offsets needed to provide bloody indention significant crap.
	.** tfm converts points to characters using 7p/ch so these guarentee correct
	.** spacing.
	.**
	.dv _ch2 14p
	.dv _ch4 28p
	.dv _ch6 42p
	.dv _ch8 56p
	.dv _ch10 70p

	.** Long strings of equals and dashes needed to make title/subtitle easier to generate. Multi
	.** line annotations for headers could be used, but the code is messy for what results in
	.** 4 lines in the setup files.
	.**
	.dv many_equals ============================================================================================
	.dv many_dashes --------------------------------------------------------------------------------------------
	.dv many_tildas ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	.gv semver
	.if &_major 1 >
		.** tfm version 2.0.0+ supports header annotation for rst
		.dh 1 a==after s=2,1 i=0 m=0
		.dh 2 a=-after s=2,1 i=0 m=0
		.dh 3 a=~after s=2,0 i=0 m=0

		.dv h1 .h1 $1
		.dv h2 .h2 $1
		.dv h3 .h2 $1
	.ei
		.dv __alert ### WARNING ###  rst.im detects an old(er) version of tfm some formatting might not be right
		.sv __alert

		.dh 1 s=2,1 i=0 m=0
		.dh 2 s=1.1 i=0 m=0
		.dh 3 s=1,0 i=0 m=0

		.dv h1 .sp 1 $1 .br &many_equals .sp 1
		.dv h2 .sp 1 $1 .br &many_dashes .sp 1
		.dv h3 .sp 1 $1 .br &many_tildas .sp 1
	.fi

	.dv cd 1 &{col_width!8.0i} m=0i

	.dv h4 **$1**

	.dv fig .fg $1
	.dv fig_cen .fg $1
	.dv set_font_cw

	.dv nf  .sp 1 ^:^: .br .ll -2 .in +2
	.dv fo  .in -2 .ll +2 .sp 1

	.dv indent
	.dv uindent

	.** list item characters
	.dv lic1 *
	.dv lic2 -
	.dv lic3 +

	.in 0i						.** bloody rst is indention sensitive like markdown; sheesh

	.dv esc \$1 : .** bloody need to escape _ and * at the end of a word
	.dv line_len .ll $1
	.dv space .sp 1
	.dv half_space .sp 1
	.dv break .br |
	.dv mult_space .sp $1

	.** ------- bullet lists -------------------------
	.dv beg_list .sp 1 .bl ${1!*} ^: .br
	.dv end_list .el .sp 1
	.dv li .br .li

	.dv ex_start .sp 1 ^:^: .sp 1 .ll -2 .in +2 .nf
	.dv ex_end .fo on .in -2 .ll +2 .sp 1
	.dv ex_end_fig .fo on .in -2 .ll +2 .fg $1 ^: .sp 1
	.dv ex_end_cfig .fo on .in -2 .ll +2 .fg $1 ^: .sp 1

	.dv proto_start .sp 1 .cc .5i .st 9 .sf Courier-bold .nf
	.dv proto_end .fo on .sf ^&text_font .st ^&text_size .sp .3

	.dv center .br $1 .br
	.dv center_start ^.. class:: center .br
	.dv center_end .sp 1

	.** fonts and font macros
	.dv ital *$1*
	.dv bold **$1**
	.dv cw ^^^`^^^`$1^^^`^^^`
	.** global font changes seem impossible in RST
	.dv set_font_prop

	.dv super .sm ^[ .sm ^&{ss_num}]
	.dv ss_num 1
	.dv note .dv ss_num ^[ ?%.0f ^&ss_num 1 + ] ^: .sm ^^[^&{ss_num}]
	.** rst has no concept of a page, so all notes go to the close of the doc
	.dv atbot atclose


	.** ----------- definition lists and tables ------------------------------------
	.if false
		A list table without borders should build a reasonable def list in
		RST. What RST touts as a def list turns out looking like crap, so we
		jump some hoops to generate a two column table.
		The usual pratcice of adding half space between items is ignored
		by rst, and we add addtional "logic" to insert a blank line betwen
		rows in order to visually separate the entries. Better than the default
		but certainly not great. The output of these macros is extreamely  space
		sensitive (leading spaces because python programmers believe these
		kinds of "everythign must align" parsers are good).

		It seems that not all HTML generated from RST is done consistently. As an example
		the HTML generated for read the docs does NOT respect the no boarder option
		on tables, and adds additional space at the bottom of each table.  Thus there
		are two sets of definition list macros; by default the RTD style of ignoring
		directives is assumed. The alternate set can be enabled by setting the variable
		'sane_dlist' before imbedding this definition file.

		When sane_dlist is set to 1, definition list items will be separated with a row
		separater applied at the start of rows 2-n.

		RST requires a blank line prior to the start of the list, so we force one.
	.fi

	.** beg_dlist parms 1 and 2 are for PFM, $3 is for rst and is optionally the term,def widths (e.g. 15,80)
	.** mind the tildas (end of line escapes in {X}fm
	.**
	.if &{sane_dlist!0} 1 =
		.dv beg_dlist   .dv di_term 1 ^: ~
						.dv row_sep .sp 1 ^: ~
						.sp 1 ~
						.in +&_ch4 ~
						^.. list-table^:^: .in +&_ch2 ^:widths^: ${3!auto} .br ^:header-rows^: 0  .br ^:class^: borderless ~
						.in +&ch_6

		.dv ditem  ^&row_sep  * -  **$1** .in +&_ch2 - .in +&_ch2 .dv row_sep .sp 1 | .in -&{_ch4} .sp 1 ^:
		.dv ditem_nosp  .in -&{_ch4} * -  **$1** .in +&_ch2 - .in +&_ch2 .dv row_sep .sp 1 | .in -&{_ch4} .sp 1 ^:

		.dv di     ^&row_sep  * -  **$1** .in +&_ch2 - .in +&_ch2 .dv row_sep .sp 1 | .in -&{_ch4} .sp 1 ^:
		.dv diitem  ^&row_sep  * -  **$1** .in +&_ch2 - .in +&_ch2 .dv row_sep .sp 1 | .in -&{_ch4} .sp 1 ^:

	.ei
		.dv beg_dlist   .dv di_term 1 ^: ~
						.dv row_sep .sp 1 ^: ~
						.sp 1 ~
						.in +&_ch4 ~
						^.. list-table^:^: .in +&_ch2 ^:widths^: ${3!auto} .br ^:header-rows^: 0  .br ^:class^: borderless ~
						.in +&ch_6

		.dv ditem  ^&row_sep  * -  **$1** .in +&_ch2 - .in +&_ch2 .dv row_sep .in -&{_ch4} .sp 1 ^:
		.dv ditem_nosp ^&row_sep * -  **$1** .in +&_ch2 - .in +&_ch2 .dv row_sep .in -&{_ch4} .sp 1 ^:
		.dv di  ^&row_sep  * -  **$1** .in +&_ch2 - .in +&_ch2 .dv row_sep .in -&{_ch4} .sp 1 ^:
		.dv diitem  ^&row_sep  * -  **$1** .in +&_ch2 - .in +&_ch2 .dv row_sep .in -&{_ch4} .sp 1 ^:
	.fi

	.** auto numbering ditem has to be hacked in since we're completely unable to use {X}fm's list gen for RST
	.dv aditem  ^&row_sep .in &_ch6  * -  **^&{di_term}** .in &_ch8 - .in &_ch10 .dv row_sep .sp 1 | .sp 1 ^: .dv di_term ^[ %.0f ^&di_term 1 + ]

	.dv end_dlist .sp 1 .in -&{_ch10} .sp 1

	.** generate a table with borders
	.dv beg_table ^.. list-table^:^: .br ^`   ^` ^:widths^: $1 .br ^`   ^` ^:header-rows^: 0 .sp 1

	.** generate a table without borders
	.dv beg_table_nb ^.. list-table^:^: .br ^`   ^` ^:widths^: $1 .br ^`   ^` ^:header-rows^: 0  .br ^`   ^` ^:class^: borderless .sp 1

	.** remainder of table support commands not dependent on borders/borderless
	.dv col .in 0i .br ^` `   -` ^` .in 56p
	.dv row .in 0i .sp 1 ^` ` * -` ^` .in 56p
	.dv end_table .sp 1 .in 0i
	.dv tab_cell ^&col
	.dv tab_row ^&row

	.ju off