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author | Case Duckworth | 2024-02-06 00:11:59 -0600 |
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committer | Case Duckworth | 2024-02-06 00:11:59 -0600 |
commit | b1b0b5f2b000d20f9bc6fa32a734a6e8fb52eb9b (patch) | |
tree | fc18b136592217b33d805027524195b894d8561a /readme.html | |
parent | Add license, makefile, etc (diff) | |
download | subtext-b1b0b5f2b000d20f9bc6fa32a734a6e8fb52eb9b.tar.gz subtext-b1b0b5f2b000d20f9bc6fa32a734a6e8fb52eb9b.zip |
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1 | <h1>Subtext, a layered document preperation system</h1> | ||
2 | <p>This repo contains the source of my groff-aesthetic document preparator | ||
3 | <code>subtext</code>. | ||
4 | It's unique in that it's an | ||
5 | <code>awk(1p)</code> | ||
6 | script that compiles a source file to a | ||
7 | shell script that you can pipe to | ||
8 | <code>sh(1p)</code>.</p> | ||
9 | <p>Doing things in this multi-layered way allows me to | ||
10 | <ul><li>Build a rich writing environment using only off-the-shelf POSIX tools</li> | ||
11 | <li>Use the same input to generate multiple outputs</li> | ||
12 | <li>A cool third thing</li></ul> | ||
13 | so I can truly write-once, run anywhere | ||
14 | (or whatever the kids are saying these days). | ||
15 | Plus, it looks kinda like | ||
16 | <code>roff(1)</code> | ||
17 | without having to remember all the arcane two-letter requests and macros.</p> | ||
18 | |||
19 | <h2>Quickstart</h2> | ||
20 | <p>An easy and quick way to start with <code>subtext</code> is to build this README: | ||
21 | <pre><code>make readme</code></pre> | ||
22 | Of course, I'd recommend reading readme.st in this repo | ||
23 | to get a feel for the syntax as well. | ||
24 | I've tried to use all the ways to inject control codes to illustrate it.</p> | ||
25 | <p>However, this | ||
26 | <em>quick start</em> | ||
27 | is not really a good explanation of what's going on. | ||
28 | For that, keep reading.</p> | ||
29 | |||
30 | <h2>The layers of subtext, the subtextual layers</h2> | ||
31 | <p>There are three main layers of <code>subtext</code>: the | ||
32 | <b>awk</b> | ||
33 | layer, | ||
34 | <b>shell</b> | ||
35 | layer, | ||
36 | and, for lack of something better to call it, the | ||
37 | <b>text</b> | ||
38 | layer. | ||
39 | These layers don't really reflect the order of expansions, | ||
40 | but rather how I think they feel to the user | ||
41 | and how they're reflected in syntax. | ||
42 | <code>subtext</code> | ||
43 | is inherently a line-based markup language, | ||
44 | and each of these layers has its own line marker.</p> | ||
45 | |||
46 | <h3>Awk layer: <code>%</code></h3> | ||
47 | <p>The first thing that happens to any <code>subtext</code> source file is a pass through | ||
48 | <code>subtext.awk</code>. | ||
49 | While this awk script passes most things through to the next layers, | ||
50 | there are two special directives at this layer you can use:</p> | ||
51 | <dl><dt><code>%</code></dt> | ||
52 | <dd>Comment the current line. | ||
53 | <code>%</code> | ||
54 | only works at the start of a line for comments.</dd> | ||
55 | <dt><code>%so FILE</code></dt> | ||
56 | <dd>Insert FILE verbatim at the line where this directive appears. | ||
57 | FILE is searched in <code>$ST_SOPATH</code>, | ||
58 | which by default is the current directory.</dd></dl> | ||
59 | <p>I went ahead and reserved <code>%</code>-lines for future directives | ||
60 | that need to be done at awk-time.</p> | ||
61 | |||
62 | <h3>Shell layer: <code>#</code></h3> | ||
63 | |||
64 | <i>todo</i> | ||
65 | |||
66 | <h3>Text layer: <code>.</code></h3> | ||
67 | |||
68 | <i>todo</i> | ||
69 | |||
70 | <h2>Contributing</h2> | ||
71 | <p>Send me an email or whatever :) | ||
72 | This project is licensed under the BSD-3 license. | ||
73 | See COPYING for details.</p> | ||