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1 | % \begin{meta-comment} <general public licence> |
2 | %% |
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3 | %% cmtt package -- nicer handling of the Computer Modern Typewriter font |
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4 | %% Copyright (c) 1996, 2002, 2003 Mark Wooding |
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5 | %% |
6 | %% This program is free software; you can redistribute it and/or modify |
7 | %% it under the terms of the GNU General Public License as published by |
8 | %% the Free Software Foundation; either version 2 of the License, or |
9 | %% (at your option) any later version. |
10 | %% |
11 | %% This program is distributed in the hope that it will be useful, |
12 | %% but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | %% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | %% GNU General Public License for more details. |
15 | %% |
16 | %% You should have received a copy of the GNU General Public License |
17 | %% along with this program; if not, write to the Free Software |
18 | %% Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
19 | %% |
20 | % \end{meta-comment} |
21 | % |
22 | % |
23 | % \begin{meta-comment} <Package preambles> |
24 | %<+sty>\NeedsTeXFormat{LaTeX2e} |
25 | %<+sty>\ProvidesPackage{cmtt} |
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26 | %<+fd>\ProvidesFile{mttcmtt.fd} |
27 | %<+def>\ProvidesFile{mttcmtt.def} |
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28 | %<+sty|fd|def> [2020/09/06 1.14.0 Handing of the cmtt font] |
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29 | % \end{meta-comment} |
30 | % |
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31 | % \CheckSum{174} |
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32 | %% \CharacterTable |
33 | %% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z |
34 | %% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z |
35 | %% Digits \0\1\2\3\4\5\6\7\8\9 |
36 | %% Exclamation \! Double quote \" Hash (number) \# |
37 | %% Dollar \$ Percent \% Ampersand \& |
38 | %% Acute accent \' Left paren \( Right paren \) |
39 | %% Asterisk \* Plus \+ Comma \, |
40 | %% Minus \- Point \. Solidus \/ |
41 | %% Colon \: Semicolon \; Less than \< |
42 | %% Equals \= Greater than \> Question mark \? |
43 | %% Commercial at \@ Left bracket \[ Backslash \\ |
44 | %% Right bracket \] Circumflex \^ Underscore \_ |
45 | %% Grave accent \` Left brace \{ Vertical bar \| |
46 | %% Right brace \} Tilde \~} |
47 | %% |
48 | % |
49 | % \begin{meta-comment} |
50 | % |
51 | %<*driver> |
52 | \input{mdwtools} |
53 | \describespackage{cmtt} |
54 | \mdwdoc |
55 | %</driver> |
56 | % |
57 | % \end{meta-comment} |
58 | % |
59 | %^^A------------------------------------------------------------------------- |
60 | % \section{Introductory note} |
61 | % |
62 | % \LaTeX\ has a rather cunning encoding handling system, which makes funny |
63 | % commands like accents work properly independent of the current font's |
64 | % actual layout. While this works rather well most of the time, the standard |
65 | % \mtt{tt} font has been rather left out of things. \LaTeX\ assumes that |
66 | % the Computer Modern Typewriter fonts have exactly the same layout as the |
67 | % more normal Computer Modern Roman family (i.e., that both conform to the |
68 | % \mtt{OT1} encoding). This plainly isn't true, since the Typewriter font |
69 | % contains a bunch of standard ASCII characters which are omitted from the |
70 | % standard Computer Modern fonts, such as curly braces \mtt{\{} and \mtt{\}}, |
71 | % and the backslash \mtt{\\}; these are usually dug up from the maths fonts, |
72 | % which looks fine in normal text, but looks really odd in monospace text. |
73 | % Compare `\texttt{\textbackslash begin\{document\}}' to |
74 | % `\mtt{\\begin\{document\}}', for example. |
75 | % |
76 | % There are two possibilities for dealing with this problem. One is to use |
77 | % the \mtt{\\verb} command, which works since all the extra characters in |
78 | % the Typewriter font are in the correct places, or use the DC~fonts, which |
79 | % have a proper encoding set up which contains all of these special |
80 | % characters anyway. |
81 | % |
82 | % Neither of these solutions is perfect. Using \mtt{\\verb} causes all |
83 | % manner of little niggly problems: you can't use it in footnotes or |
84 | % section headings, for example. (There are of course workarounds for this |
85 | % sort of thing: the author's \package{footnote} package provides a |
86 | % \env{footnote} environment which will allow verbatim text, and verbatim |
87 | % text in section headings can be achieved if one is sufficiently |
88 | % \TeX nical.) Using the DC~fonts is fine, although you actually lose a |
89 | % glyph or two. As far as the author is aware, the character \mtt{\'} (an |
90 | % `unsexed' single quote) is not present in the \mtt{T1}-encoded version of |
91 | % Computer Modern Typewriter, although it is hidden away in the original |
92 | % version. The author has found a need for this character in computer |
93 | % listings, and was horrified to discover that it was replaced by a German |
94 | % single quote character (\mtt{\\quotesinglbase}). |
95 | % |
96 | % This package defines a special encoding for the Computer Modern Typewriter |
97 | % font, so that documents can take advantage of its ASCII characters without |
98 | % resorting to verbatim text. (The main advantage of the DC~fonts, that |
99 | % words containing accents can be hyohenated, doesn't really apply to the |
100 | % Typewriter font, since it doesn't allow hyphenation by default anyway.) |
101 | % |
102 | % There are several files you'll need to create: |
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103 | % \begin{description} \setdescriptionlabel{\mttfamily#1} |
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104 | % |
105 | % \item [cmtt.sty] tells \LaTeX\ that there's a new encoding. It also |
106 | % provides some options for customising some aspects of the |
107 | % encoding, and defines some useful commands. |
108 | % |
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109 | % \item [mttenc.def] describes the encoding to \LaTeX: it sets up all the |
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110 | % appropriate text commands so that they produce beautiful results. |
111 | % |
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112 | % \item [mttcmtt.fd] describes the re-encoded version of the font. this |
113 | % is more or less a copy of the file \mtt{ot1cmtt.fd}. |
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114 | % |
115 | % \end{description} |
116 | % |
117 | % The package accepts some options which may be useful: |
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118 | % \begin{description} \setdescriptionlabel{\sffamily#1} |
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119 | % |
120 | % \item [override] overrides the meaning of the \mtt{\\ttfamily} command |
121 | % (and therefore also the \mtt{\\texttt} command too), making it the |
122 | % same as the new \mtt{\\mttfamily} command. This isn't the default |
123 | % just in case the change breaks something in an unexpected way. |
124 | % |
125 | % \item [t1] informs the package that you're using the \mtt{T1} encoding, |
126 | % and therefore can borrow some accented characters from the DC~version |
127 | % of Computer Modern Typewriter. This will probably be unnecessary, |
128 | % since the package attempts to work out what to do all by itself. |
129 | % |
130 | % \item [ot1] forces the package \emph{not} to use the DC~version of the |
131 | % Computer Modern Typewriter font for funny accents. Only use this |
132 | % option if the package thinks it should use the DC~Typewriter font |
133 | % when it shouldn't. |
134 | % |
135 | % \end{description} |
136 | % |
137 | % \DescribeMacro{\mttfamily} |
138 | % The command \mtt{\\mttfamily} selects the properly-encoded Typewriter |
139 | % font. It's a declaration which works just like the \mtt{\\ttfamily} |
140 | % command, except that comamnds like \mtt{\\\}} and \mtt{\\\_} use the |
141 | % characters from the font rather than choosing odd-looking versions from |
142 | % the maths fonts. All of the accent commands still work properly. In fact, |
143 | % some accent commands which didn't work before have been fixed. For |
144 | % example, saying `\mtt{\\texttt\{P\\'al Erd\\H os\}}' would produce |
145 | % something truly appalling like `\texttt{P\'al Erd\H os}', which is |
146 | % obviously ghastly. The new encoding handles this properly, and produces |
147 | % `\textmtt{P\'al Erd\H os}'.\footnote{ |
148 | % This isn't quite perfect. The accent, which isn't actually present in |
149 | % the Typewriter font, is taken from the Computer Modern bold font, but |
150 | % it doesn't look too bad. However, if you pass the option \textsf{t1} |
151 | % to the \package{cmtt} package when you load it, the accent will be taken |
152 | % from the DC~Typewriter font, and it will look totally wonderful.} |
153 | % |
154 | % \DescribeMacro{\textmtt} |
155 | % Font changing commands are much more convenient than th declarations, |
156 | % so a command \mtt{\\textmtt} is provided: it just typesets its argument |
157 | % in the re-encoded Typewriter font. |
158 | % |
159 | % \DescribeMacro{\mtt} |
160 | % Rather more excitingly, the \mtt{\\mtt} command allows you to generate |
161 | % almost-verbatim text very easily, without any of the restrictions of |
162 | % the \mtt{\\verb} command. This command was inspired by something which |
163 | % David Carlisle said to me in an email correspondence regarding the |
164 | % overuse of verbatim commands. |
165 | % |
166 | % \mtt{\\mtt} redefines several `short' commands to typeset the obvious |
167 | % characters. The complete list is shown below: there are some oddities, |
168 | % so watch out. |
169 | % |
170 | % ^^A This is an evil table. See if I care. (This is based on lots of |
171 | % ^^A hacking I did in glyphs.tex, but a good deal less horrible.) |
172 | % |
173 | % \medskip |
174 | % \hbox to \hsize\bgroup |
175 | % \hfil\vbox\bgroup |
176 | % \def\ex#1#2{\strut |
177 | % \enskip |
178 | % \mtt{\\\char`#2}\quad\hfil% |
179 | % \mtt{#2}\enskip} |
180 | % \def\h{\noalign{\hrule}} |
181 | % \def\v{height2pt&\omit&&\omit&&\omit&&\omit&&\omit&\cr} |
182 | % \let~\relax |
183 | % \offinterlineskip |
184 | % \ialign\bgroup&\vrule#&\ex#\cr \h\v |
185 | % &~\\&&~\{&&~\}&&~\_&&~\^&\cr \v\h\v |
186 | % &~\$&&~\%&&~\&&&~\#&&~\~&\cr \v\h\v |
187 | % &~\"&&~\'&&~\ &&~\|&&\omit\hfil&\cr \v\h |
188 | % \egroup\egroup |
189 | % \hfil\egroup |
190 | % \medskip |
191 | % |
192 | % As well as redefining these commands, \mtt{\\mtt} will endeavour to make |
193 | % single special characters display themselves in a verbatim-like way. This |
194 | % only works on `active' characters (like \mtt{~}), and \mtt{\\mtt} makes |
195 | % no attempt to change the category codes of any characters. |
196 | % |
197 | % Among other things, you'll probably noticed that several accent-making |
198 | % commands have been redefined. You can still use these accents through |
199 | % the \mtt{\\a} command, by saying \mtt{\\a'}, \mtt{\\a\^} and so on, |
200 | % as in the \env{tabbing} environment. |
201 | % |
202 | % There are also some oddities in the table: \mtt{\|} and \mtt{\"} can be |
203 | % accessed easily without playing with silly commands. Well, that's almost |
204 | % the case: these two characters are both often used as `short' verbatim |
205 | % commands, so they are forced back to their normal meanings so you can |
206 | % type them. |
207 | % |
208 | % Finally, a word on spacing. The \mtt{\\\ } command has been hijacked |
209 | % to produce a funny `visible space' character. You can still produce |
210 | % multiple spaces by saying something like `\mtt{\ \{\}\ \{\}}\dots\mtt{\ }', |
211 | % which is a bit contrived, but that's tough. Also, \mtt{~} has been stolen |
212 | % so that you can type \mtt{~} characters (e.g., in URLs), so the only |
213 | % way you can tpye a nonbreaking space is by using the \mtt{\\nobreakspace} |
214 | % command, which is a bit of a mouthful. There's an abbreviation, though: |
215 | % \mtt{\\nbsp} now means exactly the same thing. |
216 | % |
217 | % Was that not all supremely useful? Oh, just a note: this document doesn't |
218 | % use a single verbatim command or environment (except in the listings, |
219 | % where it's unavoidable) -- it's all done with \mtt{\\mtt}. |
220 | % |
221 | % \implementation |
222 | % |
223 | % \section{Implementation} |
224 | % |
225 | % \subsection{The package} |
226 | % |
227 | % \begin{macrocode} |
228 | %<*sty> |
229 | % \end{macrocode} |
230 | % |
231 | % I'll start with some options handling. |
232 | % |
233 | % \begin{macrocode} |
234 | \newif\ifcmtt@override |
235 | \newif\ifcmtt@dcfonts |
236 | \def\@tempa{T1}\ifx\encodingdefault\@tempa |
237 | \cmtt@dcfontstrue |
238 | \fi |
239 | \DeclareOption{override}{\cmtt@overridetrue} |
240 | \DeclareOption{t1}{\cmtt@dcfontstrue} |
241 | \DeclareOption{ot1}{\cmtt@dcfontsfalse} |
242 | \ProcessOptions |
243 | % \end{macrocode} |
244 | % |
245 | % This bit is really trivial. I'll just declare the font encoding. Oh, that |
246 | % was easy. |
247 | % |
248 | % \begin{macrocode} |
249 | \DeclareFontEncoding{mTT}{}{} |
250 | % \end{macrocode} |
251 | % |
252 | % Wait: there's a problem. \LaTeX\ will now complain bitterly that it can't |
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253 | % find the font \mtt{mTT/cmr/m/n}, which is reasonable, since I haven't |
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254 | % declared any such font. The following line should sort this out, |
255 | % |
256 | % \begin{macrocode} |
257 | \DeclareFontSubstitution{mTT}{cmtt}{m}{n} |
258 | % \end{macrocode} |
259 | % |
260 | % Now I'd better load all the text commands I'll need when in this funny |
261 | % font variant. |
262 | % |
263 | % \begin{macrocode} |
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264 | \input{mttenc.def} |
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265 | % \end{macrocode} |
266 | % |
267 | % \begin{macro}{\mttfamily} |
268 | % \begin{macro}{\textmtt} |
269 | % |
270 | % Finally, I'll need to define a command which switches to this funny font, |
271 | % and a \mtt{\\text}\dots\ command for it. |
272 | % |
273 | % \begin{macrocode} |
274 | \DeclareRobustCommand{\mttfamily}{% |
275 | \fontencoding{mTT}\fontfamily{\ttdefault}\selectfont% |
276 | } |
277 | \DeclareTextFontCommand{\textmtt}{\mttfamily} |
278 | % \end{macrocode} |
279 | % |
280 | % \end{macro} |
281 | % \end{macro} |
282 | % |
283 | % If an override was requested, make \mtt{\\ttfamily} the same as |
284 | % \mtt{\\mttfamily}. |
285 | % |
286 | % \begin{macrocode} |
287 | \ifcmtt@override |
288 | \let\ttfamily\mttfamily |
289 | \fi |
290 | % \end{macrocode} |
291 | % |
292 | % Well, that's all that's needed for the font definition. Here's a command |
293 | % which will typeset its argument in the typewriter font, allowing easy |
294 | % access to all the funny characters, and printing them properly in the |
295 | % correct font (which \mtt{\\\{} doesn't do, for example). |
296 | % |
297 | % \begin{macro}{\mtt@setchar} |
298 | % |
299 | % This macro assigns the given meaning to the given control sequence. Also, |
300 | % if the character named in the control sequence is currently set active, |
301 | % it will set the active meaning of the character to the same value. |
302 | % |
303 | % \begin{macrocode} |
304 | \def\mtt@setchar#1#2{% |
305 | \ifx#1#2\chardef#1`#1\else\let#1#2\fi% |
306 | \ifnum\catcode`#1=13% |
307 | \begingroup% |
308 | \lccode`\~=`#1% |
309 | \lowercase{\endgroup\let~#1}% |
310 | \fi% |
311 | } |
312 | % \end{macrocode} |
313 | % |
314 | % \end{macro} |
315 | % |
316 | % \begin{macro}{\mtt@chars} |
317 | % |
318 | % This macro lists the various control sequences which should be set up, |
319 | % so that they can be easily added to. |
320 | % |
321 | % \begin{macrocode} |
322 | \def\mtt@chars{% |
323 | \do\#\#% |
324 | \do\%\%% |
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325 | \do\&\&% |
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326 | \do\^\^% |
327 | \do\~\~% |
328 | \do\'\textquotesingl% |
329 | \do\"\textquotedbl% |
330 | \do\|\textbar% |
331 | \do\$\textdollar% |
332 | \do\_\textunderscore% |
333 | \do\{\textbraceleft% |
334 | \do\}\textbraceright% |
335 | \do\\\textbackslash% |
336 | \do\ \textvisiblespace% |
337 | } |
338 | % \end{macrocode} |
339 | % |
340 | % \end{macro} |
341 | % |
342 | % \begin{macro}{\mtt@do} |
343 | % |
344 | % This just sets up all the special characters listed above. It's a simple |
345 | % abbreviation, really. |
346 | % |
347 | % \begin{macrocode} |
348 | \def\mtt@do{\let\do\mtt@setchar\mtt@chars} |
349 | % \end{macrocode} |
350 | % |
351 | % \end{macro} |
352 | % |
353 | % \begin{macro}{\mtt} |
354 | % |
355 | % And finally, the macro itself. Ta-da! |
356 | % |
357 | % \begin{macrocode} |
358 | \DeclareRobustCommand\mtt[1]{\textmtt{\mtt@do#1}} |
359 | % \end{macrocode} |
360 | % |
361 | % \end{macro} |
362 | % |
363 | % \begin{macro}{\@tabacckludge} |
364 | % |
365 | % The otherwise almost totally perfect \mtt{\\@tabacckludge} gets very |
366 | % upset when its argument is an active character. (If you're wondering, |
367 | % this is the command which is responsible for the behaviour of the \mtt{\\a} |
368 | % command.) Adding a \mtt{\\string} makes everything work perfectly. |
369 | % |
370 | % \begin{macrocode} |
371 | \def\@tabacckludge#1{% |
372 | \expandafter\@changed@cmd\csname\string#1\endcsname\relax% |
373 | } |
374 | \let\a\@tabacckludge |
375 | % \end{macrocode} |
376 | % |
377 | % \end{macro} |
378 | % |
379 | % \begin{macro}{\nbsp} |
380 | % |
381 | % Make an abbreviation for \mtt{\\nobreakspace}. |
382 | % |
383 | % \begin{macrocode} |
384 | \let\nbsp\nobreakspace |
385 | % \end{macrocode} |
386 | % |
387 | % \end{macro} |
388 | % |
389 | % I think that's all that I have to do for the package. If there's any |
390 | % more to do, I'll add it later. |
391 | % |
392 | % \begin{macrocode} |
393 | %</sty> |
394 | % \end{macrocode} |
395 | % |
396 | % |
397 | % \subsection{The font definition file} |
398 | % |
399 | % This is obviously copied almost verbatim from the file \mtt{OT1cmtt.fd}. |
400 | % |
401 | % \begin{macrocode} |
402 | %<*fd> |
403 | \DeclareFontFamily{mTT}{cmtt}{\hyphenchar\font\m@ne} |
404 | \DeclareFontShape{mTT}{cmtt}{m}{n}{ |
405 | <5> <6> <7> <8> cmtt8 |
406 | <9> cmtt9 |
407 | <10> <10.95> cmtt10 |
408 | <12> <14.4> <17.28> <20.74> <24.88> cmtt12 |
409 | }{} |
410 | \DeclareFontShape{mTT}{cmtt}{m}{it}{ |
411 | <5> <6> <7> <8> <9> <10> <10.95> <12> <14.4> <17.28> <20.74> <24.88> |
412 | cmitt10 |
413 | }{} |
414 | \DeclareFontShape{mTT}{cmtt}{m}{sl}{ |
415 | <5> <6> <7> <8> <9> <10> <10.95> <12> <14.4> <17.28> <20.74> <24.88> |
416 | cmsltt10 |
417 | }{} |
418 | \DeclareFontShape{mTT}{cmtt}{m}{sc}{ |
419 | <5> <6> <7> <8> <9> <10> <10.95> <12> <14.4> <17.28> <20.74> <24.88> |
420 | cmtcsc10 |
421 | }{} |
422 | \DeclareFontShape{mTT}{cmtt}{m}{ui} {<->sub * cmtt/m/it} {} |
423 | \DeclareFontShape{mTT}{cmtt}{bx}{n} {<->sub * cmtt/m/n} {} |
424 | \DeclareFontShape{mTT}{cmtt}{bx}{it} {<->sub * cmtt/m/it} {} |
425 | \DeclareFontShape{mTT}{cmtt}{bx}{ui} {<->sub * cmtt/m/it} {} |
426 | %</fd> |
427 | % \end{macrocode} |
428 | % |
429 | % |
430 | % \subsection{The encoding definitions file} |
431 | % |
432 | % I've saved the trickiest bit until last. This file defines the mappings |
433 | % from text commands to glyphs in the font. |
434 | % |
435 | % \begin{macrocode} |
436 | %<*def> |
437 | % \end{macrocode} |
438 | % |
439 | % First for some fun with accents. The |cmtt| font doesn't contain all of |
440 | % the accents which the other Computer Modern fonts do, because those slots |
441 | % contain the standard ASCII characters which usually have to be `borrowed' |
442 | % from the maths fonts. |
443 | % |
444 | % Anyway, there's a load which don't need any special treatment. These are |
445 | % chosen from the \mtt{OT1} encoding by default anyway, so I needn't |
446 | % bother unless I'm really bothered about speed. I'm not, so I'll save |
447 | % the memory. |
448 | % |
449 | % Following the example of the \TeX book, I'll use the bold roman font |
450 | % for accents, so that they don't look really spindly. This is actually |
451 | % remarkably difficult to do, because the \textsf{NFSS} keeps getting in |
452 | % the way. I'll look after the old font name in a macro (it's handy that |
453 | % \textsf{NFSS} maintains this for me) and change to a known font, do the |
454 | % accent, change font back again, do the argument to the accent, and then |
455 | % close the group I did all of this in, so that no-one else notices what a |
456 | % naughty chap I am, really. This is startlingly evil. |
457 | % |
458 | % \begin{macrocode} |
459 | \def\cmtt@accent#1#2{{% |
460 | \let\@old@font\font@name% |
461 | \ifcmtt@dcfonts% |
462 | \fontencoding{T1}\selectfont% |
463 | \else% |
464 | \usefont{OT1}{cmr}{bx}{n}% |
465 | \fi% |
466 | #1{\@old@font#2}% |
467 | }} |
468 | % \end{macrocode} |
469 | % |
470 | % And now for the actual offending accents. |
471 | % |
472 | % \begin{macrocode} |
473 | \DeclareTextCommand{\H}{mTT}{\cmtt@accent\H} |
474 | \DeclareTextCommand{\.}{mTT}{\cmtt@accent\.} |
475 | % \end{macrocode} |
476 | % |
477 | % The `under' accents are all OK, so I shan't bother to define them either. |
478 | % Similarly, lots of the text symbol commands are fine as they are by |
479 | % default and I don't need to try and define them again. |
480 | % |
481 | % This, then, is the remaining commands which really need sorting out. |
482 | % (By the way, the only reason I've redefined \mtt{\\textellipsis} is |
483 | % because otherwise it will mess up the nice monospacing.) |
484 | % |
485 | % \begin{macrocode} |
486 | \DeclareTextSymbol{\textbackslash}{mTT}{92} |
487 | \DeclareTextSymbol{\textbar}{mTT}{124} |
488 | \DeclareTextSymbol{\textbraceleft}{mTT}{123} |
489 | \DeclareTextSymbol{\textbraceright}{mTT}{125} |
490 | \DeclareTextSymbol{\textless}{mTT}{60} |
491 | \DeclareTextSymbol{\textgreater}{mTT}{62} |
492 | \DeclareTextSymbol{\textunderscore}{mTT}{95} |
493 | \DeclareTextSymbol{\textvisiblespace}{mTT}{32} |
494 | \DeclareTextCommand{\textellipsis}{mTT}{...} |
495 | \DeclareTextSymbol{\textquotedbl}{mTT}{34} |
496 | \DeclareTextSymbol{\textquotesingl}{mTT}{13} |
497 | % \end{macrocode} |
498 | % |
499 | % That's all there is. Please return to your homes. |
500 | % |
501 | % \Finale |
502 | % |
503 | \endinput |