summaryrefslogtreecommitdiff
path: root/macros/latex/contrib/spacingtricks/spacingtricks.dtx
blob: 3c22a98a8aa0f3ee3e1b673680b71e7d9ecbbb0e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
% \iffalse meta-comment
%
% Copyright (C) 2019-2020 by Antoine Missier <antoine.missier@ac-toulouse.fr>
%
% This file may be distributed and/or modified under the conditions of
% the LaTeX Project Public License, either version 1.3 of this license
% or (at your option) any later version.  The latest version of this
% license is in:
%
%   http://www.latex-project.org/lppl.txt
%
% and version 1.3 or later is part of all distributions of LaTeX version
% 2005/12/01 or later.
% \fi
%
% \iffalse
%<*driver>
\ProvidesFile{spacingtricks.dtx}
%</driver>
%<*package> 
\NeedsTeXFormat{LaTeX2e}[2005/12/01]
\ProvidesPackage{spacingtricks}   
    [2020/11/02 v1.3 .dtx spacingtricks file]
%</package>
%<*driver>
\documentclass{ltxdoc}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[french,english]{babel}
\usepackage{lmodern}
\usepackage{spacingtricks}
\usepackage{pifont}
\usepackage{amsmath}
\usepackage{pstricks-add}
\DisableCrossrefs         
%\CodelineIndex
%\RecordChanges
\usepackage{hyperref}
\hypersetup{%
    colorlinks, 
    linkcolor=blue,
    citecolor=blue,
    pdftitle={spacingtricks}, 
    pdfsubject={LaTeX package}, 
    pdfauthor={Antoine Missier}
}
\begin{document}
    \DeleteShortVerb{\|}
    \MakeShortVerb{\"}
    \DocInput{spacingtricks.dtx}
   %\PrintChanges
   %\PrintIndex
\end{document}
%</driver>
% \fi
%
% \CheckSum{165}
%
% \CharacterTable
%  {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
%   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
%   Digits        \0\1\2\3\4\5\6\7\8\9
%   Exclamation   \!     Double quote  \"     Hash (number) \#
%   Dollar        \$     Percent       \%     Ampersand     \&
%   Acute accent  \'     Left paren    \(     Right paren   \)
%   Asterisk      \*     Plus          \+     Comma         \,
%   Minus         \-     Point         \.     Solidus       \/
%   Colon         \:     Semicolon     \;     Less than     \<
%   Equals        \=     Greater than  \>     Question mark \?
%   Commercial at \@     Left bracket  \[     Backslash     \\
%   Right bracket \]     Circumflex    \^     Underscore    \_
%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%   Right brace   \}     Tilde         \~}
%
%
% \changes{v0.1}{2011/12/27}{Initial version}
% \changes{v1.0}{2019/05/04}{dtx and ins files, added the footnote command}
% \changes{v1.0}{2019/06/16}{English translation of the documentation}
% \changes{v1.1}{2019/09/06}{No automatic line breaking at the end of the centered command,
% new length compactitemlist}
% \changes{v1.2}{2019/09/09}{A bug correction in the last update}
% \changes{v1.3}{2020/11/02}{Loading the setspace package, 
% small changes in compactlist environment, improvement in dualboxes macro}
%
% \GetFileInfo{spacingtricks.sty}
%
% \title{The \texttt{spacingtricks} package\thanks{This document
% corresponds to \textsf{spacingtricks}~\fileversion, dated \filedate.}}
% \author{Antoine Missier \\ \texttt{antoine.missier@ac-toulouse.fr}}
% \date{November 02, 2020}
% \maketitle
%
% \section{Introduction}
%
% This package offers some macros to deal with spacing issues. Thus:
% \begin{compactlist}
% \item "\centered" yields good horizontal centering without vertical spacing;
% \item "\footnote" has been redefined to avoid unsuitable spacings;
% \item "\vstrut" produces a strut with variable height or depth;
% \item "\indent" has been redefined to indent a line at the beginning 
% of a particular paragraph even if "\parindent" has been set to 0;
% \item the "indentblock" environment produces indentation of all its content;
% \item the "compactlist" environment yields a compact list, without vertical spacing
% between the items, like here;
% several aliases are provided to type some list symbols shorter:
% "\bul", "\dash", "\ddash", "\aster", "\hand", "\checksymb", "\arrowsymb";
% \item the macros "\ie" and "\eg" attends to typeset common abbreviations
% \ie and \eg with correct spacings;
% \item the "\dualboxes" command attends to place two boxes 
% (figures, tables, text) side by side by adjusting the vertical positioning.
% \end{compactlist}
% 
% \medskip
% Two other common packages are loaded by \textsf{spacingtricks}:
% \textsf{setspace} (natively in \LaTeXe), 
% for setting line spacing in a piece of text 
% (with the \texttt{spacing} environment), and
% \textsf{xspace}~\cite{XSP}, which adds an interword space unless the macro 
% is followed by a punctuation character.
%
% Otherwise, we provide the package \textsf{arraycols}~\cite{ARCOL},
% wich allows a good management of spacings in \texttt{tabular} and \texttt{array} environments,
% and \textsf{mismath}~\cite{MSMATH} of which several macros tends to improve spacings 
% in mathematical formulas.
%
% \section{Usage}
%
% \DescribeMacro{\centered}
% The "\centered"\marg{text} command yields a centered line without vertical spacing.
% It acts like "\centerline" except in lists or tables where its behavior is much better
% (see the following examples).
% Moreover, the line break before (but not after) the macro is automatic.
%
% Here is a comparative example of the centering commands inside a list:
% \begin{enumerate}
% \item Here a centered line with "\centered": 
% \centered{Lorem ipsum dolor sit amet, consectetuer adipiscing elit.}
% \item Here another centered line with "\\ \centerline":\\
% \centerline{Lorem ipsum dolor sit amet, consectetuer adipiscing elit.}
% \item Here another centered line with "\par\centerline":
% \par\centerline{Lorem ipsum dolor sit amet, consectetuer adipiscing elit.}
% \item Here a centered line with the \texttt{center} environment:
% \begin{center} Lorem ipsum dolor sit amet, consectetuer adipiscing elit. \end{center}
% \end{enumerate}
%
% In tables, "\centered" allows to center a particular cell independently of 
% the (general) column alignment
% \footnote{In tables, we can also use the powerful \texttt{\bslash makecell} command
% of the \textsf{makecell} package~\cite{MKCELL}, on the other hand
% the \texttt{\bslash centerline} command doesn't work for a single line in a cell.
% Let us also mention the \texttt{\bslash centeredline} command, from the package
% \textsf{centeredline}~\cite{CENTER}, which allows to use \texttt{\bslash verb}
% commands inside the text to center; but it doesn't work in tables either.}.
%
% \begin{center}
% \begin{tabular}{|l|r|}
% \hline
% left aligned column & right aligned column \\
% \hline
% another cell  & \centered{centered cell} \\
% \hline
% \centered{centered line} & the last cell right aligned \\
% \hline
% \end{tabular}
% \end{center}
%
% \DescribeMacro{\footnote}
% The "\footnote" command doesn't have a good management of spacing issues,
% in particular when the \textsf{hyperref} package has been loaded.
% In English tradition, there is no space before numbers (or symbols) of note calls,
% and likewise at the beginning of footnotes,
% text begins immediately after the note number
% \footnote{The typesetting of footnotes and note calls depends on national typographic
% rules which are, in principle, managed by \textsf{babel}.
% For instance, by activating the \texttt{french} option of \textsf{babel},
% a thin space is added before the note calls, and the new \texttt{\bslash footnote}
% macro does not alter this behavior.}.
% To avoid undesirable spaces, we don't have to put some space before 
% or after writing "\footnote{", for instance:
% \begin{center}
% "this is a note\footnote{good spacing} which works fine,"
% \end{center}
% but sometimes, it is convenient to place the "\footnote" command
% on a new line. To achieve this, "\footnote" has been redefined to completely eliminate
% unwanted spaces
% \footnote{Probably it would have been enough to recommend the use of the \% symbol
% at the end of line; its effect is to cancel the space produced by a line break,
% but we do not always think of using it.}.
%
% \pagebreak
% \medskip
% \noindent\begin{minipage}{5.6cm}
% \begin{verbatim}
%This a note 
%\footnote{ 
%Bad spacing example.}
%with the old command.
% \end{verbatim}
% \vspace{-4ex} This a note
% \footnt{
% Bad spacing example.}
% with the old command.
% \end{minipage}
% \hfill 
% \begin{minipage}{5.6cm}
% \begin{verbatim}
%This a note
%\footnote{ 
%Good spacing example.}
%with the new command.
% \end{verbatim}
% \vspace{-4ex} This a note 
% \footnote{ Good spacing example.}
% with the new command.
% \end{minipage}
%
% \medskip
% \DescribeMacro{\footnotespace} \DescribeMacro{\footenoteindent}
% Like the old one, the new "\footnote" command can take an opional argument
% to force the number of the note.
% Likewise, we have always the customization macros 
% "\footnotesize", "\footnotesep", "\footnoterule",
% but two new macros have been added to manage spacings:
% "\footnotespace" produces the space before the note call symbol
% and "\footnoteindent" produces the space at the beginning of the footnote text.
% For instance, with "\renewcommand{\footnotespace}{\,}" 
% and "\renewcommand{\footnoteindent}{\enskip}"
% \footnote{\texttt{\bslash enskip} is equivalent to \texttt{\bslash hspace\{0.5em\}}.}
% we get:
% \renewcommand{\footnotespace}{\,}
% \renewcommand{\footnoteindent}{\enskip}
%
% \begin{center}
% \begin{minipage}{7cm}
% This is a note \footnote{en dash spacing at the beginning of the note.}  
% with particular space settings.
% \end{minipage}
% \end{center}
% \renewcommand{\footnotespace}{}
% \renewcommand{\footnoteindent}{}
% 
% \DescribeMacro{\vstrut} 
% "\vstrut"\oarg{depth}\marg{height} produces a strut with variable height or depth,
% in order to increase the line's height (above the base line) or depth 
% (below the base line, optional);
% this command can be used in a text line, a table, a list, a formula, etc.
% If the values of \meta{height} and \meta{depth} are inferior to the height and depth
% of the current line, the command has no effect.
% Here are some examples.
%
% \noindent
% \begin{minipage}[t]{8cm}
% \begin{verbatim}
%\[\frac{\sqrt{0.5p}}{10} = 
%\frac{\sqrt{\vstrut{1.7ex} 0.5p}}{10}\]
% \end{verbatim}
% \end{minipage}
% \hfill 
% \begin{minipage}[t]{6cm}
% \[\frac{\sqrt{0.5p}}{10} = \frac{\sqrt{\vstrut{1.7ex} 0.5p}}{10}\]
% \end{minipage}
% \\
% "\fbox{\vstrut{2ex}$\sigma(X)=1$}" gives
% \fbox{\vstrut{2ex}$\sigma(X)=1$}
% better than \fbox{$\sigma(X)=1$}
% 
% \medskip
% \noindent
% The height adjustment is done by trial and error.
% We could also have used a vertical phantom box;
% for example in the previous square root, we get a good result with "\vphantom{\bar{t}}",
% but it's not obvious to know what to put in the phantom box,
% moreover, "\vstrut" allows a finer tuning.
%
% In a table,
% "\renewcommand{\arraystretch}"\marg{stretch}
% allows to increase the height of the rows but this command
% has a global effect, whereas "\vstrut" allows to adjust properly the height of each row, 
% as in the following table:
% \[  
% \begin{array}{|c|}
% \hline
% \text{bad}\\
% \hline
% \displaystyle \lim_{\substack{x \to 1\\x>1}} \ln\left(\dfrac{x^2}{x-1}\right) \\
% \hline
% \dfrac{a}{b} \\
% \hline
% \displaystyle \int_{1}^{X} \frac{1}{t}\, \mathrm{d}t  \\
% \hline
% \end{array}
% \qquad
% \begin{array}{|c|c|}
% \hline
% \multicolumn{2}{|c|}{\text{good}}\\
% \hline
% \displaystyle\lim_{\substack{x \to 1\\x>1}} \ln\left(\dfrac{x^2}{x-1}\right)\vstrut{3.8ex}
% & \mbox{obtained with } "\vstrut{3.8ex}" \\
% \hline
% \dfrac{a}{b} \vstrut[2ex]{3ex} & "\vstrut[2ex]{3ex}" \\
% \hline
% \displaystyle\int_{1}^{X} \frac{1}{t} \, \mathrm{d} t \vstrut[2.5ex]{4.2ex}
% & "\vstrut[2.5ex]{4.2ex}" \\
% \hline
% \end{array}
%\]
% However, for tables, we have the \textsf{arraycols} package~\cite{ARCOL},
% based on \textsf{cellspace}~\cite{CELLSP}, which allows to adjust
% row heights automatically. Nevertheless, "\vstrut" can be useful for fine adjustments. 
%
% In a text line, "\vstrut" can be used in place of "\vspace".
%
% \medskip
% \DescribeMacro{\indent} \DescribeMacro{\parindentlength} 
% The command "\setlength{\parindent}{0cm}" allow to eliminate any indentation of lines
% at the beginning of every paragraph. 
% But in this case, the "\indent" command does not work anymore
% if we want exceptional indentation of a particular paragraph.
% So, the initial length of "\parindent" has been saved in "\parindentlength"
% and the command "\indent" has been redefined to still allow indentation
% of length "\parindentlength".
%
% \medskip
% \DescribeEnv{indentblock}
% The \texttt{indentblock} environment allows indentation of a whole block of lines.
% It has an optional argument which is the length of indentation
% (set by default to "\parindentlength").
% The following lyrics have been indented (and typeset in italic shape) with
% "\begin{indentblock}\itshape" and stanzas 2 and 4 have been affected by
% an additional indentation with "\begin{indentblock}[3em]".
%
% \begin{indentblock}\itshape
% Overhead the albatross hangs motionless upon the air \\
% And deep beneath the rolling waves in labyrinths of coral caves \\
% The echo of a distant time comes willowing across the sand \\
% And everything is green and submarine 
% \begin{indentblock}[3em]
%    And no one showed us to the land \\
%    And no one knows the where's or why's \\
%    But something stirs and something tries \\
%    Starts to climb towards the light
% \end{indentblock}
% \noindent
% Strangers passing in the street \\
% By chance two separate glances meet \\
% And I am you and what I see is me \\
% And do I take you by the hand \\
% And lead you through the land \\
% And help me understand the best I can?
% \begin{indentblock}[3em]
%    And no one calls us to move on \\
%    And no one forces down our eyes \\
%    No one speaks and no one tries \\
%    No one flies around the sun
% \end{indentblock}
% \end{indentblock}
% 
% \DescribeEnv{compactlist}
% As its name tells it, the "compactlist" environment allows to create
% a \og compact\fg\ list, \ie without vertical space neither above nor between items.
% As for lists in \LaTeX, items are generated by the "\item" command.
% The environment has an optional argument: "\begin{compactlist}"\oarg{symbol}.
% 
% \DescribeMacro{\bul}\DescribeMacro{\dash}\DescribeMacro{\ddash}\DescribeMacro{\aster}
% \DescribeMacro{\hand}
% Default item symbol is "\textbullet" but it can be changed.
% We provide aliases for several symbols commonly used in lists:
% "\bul" \bul\ (alias for "\textbullet"), "\dash" \dash\ ("\textendash"), 
% "\ddash" \ddash\ ("\textemdash"), "\aster" \aster\ ("\textasteriskcentered"),
% as well as "\hand" \hand ("\ding{43}"), "\checksymb" \checksymb ("\ding{51}")
% and "\arrowsymb" \arrowsymb ("\ding{226}")
% which need to load the \textsf{pifont} package in the preamble.
% \DescribeMacro{\checksymb}\DescribeMacro{\arrowsymb}
% The following example is obtained with "\begin{compactlist}[\checksymb]":
% \begin{compactlist}[\checksymb]
% \item Fisrt item.
% \item Second item.
% \item Third item.
% \end{compactlist}
% \hand These aliases can be used directly in text mode, of course.
% For "\hand", "\checksymb" and "\arrowsymb", the symbol is followed by a space
% if there is no punctuation character just after it (thanks to the 
% macro \texttt{xspace} from the \textsf{xspace} package~\cite{XSP}).
%
% \medskip
% \DescribeMacro{\compactlistindent}
% This length (fixed at 0.5\,em by default) can be modified with "\setlength" to increase 
% or decrease the indentation of the \texttt{compactlist} environment.
% Notice that there are several other ways to construct a compact list in particular
% with the \texttt{noitemsep} key of the \textsf{enumitem} package~\cite{ENUM}.
%
% \medskip
% \DescribeMacro{\ie} \DescribeMacro{\eg}
% In English, at the end of a sentence, the point is followed by an em space
% which is larger than an interword space.
% We provide the "\ie" (\textit{id est}) and "\eg" (\textit{exempli gratia}) macros,
% suggested in The \LaTeX\ Companion \cite{COMP},
% to get correct spacing after these abbreviations \eg here.
% In American typography, a comma is often placed after these abbreviations,
% what we can get with "\ie,"
% on the other hand, some authors prefer to typeset \textit{\ie} in italic shape,
% which is always possible with "\textit{\ie}". 
%
% \medskip
% \DescribeMacro{\dualboxes}
% Several packages intend to set the text around a figure or a table,
% but in general we have to give the width of the box containing the figure or the table.
% Let us mention however the \textsf{picins} package~\cite{PICINS},
% cited in The \LaTeX\ Companion~\cite{COMP}, which do not ask for the box width
% and it can also be used with lists.
% Nevertheless vertical positioning can be tricky.
% For this purpose, we have written the "\dualboxes"\oarg{pos}\marg{left}\marg{right} macro,
% which places two boxes, \meta{left} and \meta{right}, side by side.
% These boxes can contain figures, tables, text, \texttt{minipage} environments
% (for several paragraphs and lists), etc.
% The optional \meta{pos} parameter sets the vertical level on which the boxes are aligned:
% a number between 0 (bottom) and 1 (top, default value).
% Here is a first example with "\dualboxes[0.65]".
%
% \medskip
% \psset{xunit=0.5cm,yunit=1.0cm,algebraic=true}
% \dualboxes[0.65]{\footnotesize
%    $\begin{array}{|*{7}{c|}} \hline
%        x    & -2    & -1    & 0 & 1    & 2    & 3    \\ \hline
%        f(x) & -0.96 & -0.71 & 0 & 0.59 & 0.38 & 0.18 \\  \hline
%    \end{array}$
%    }{
%    \begin{pspicture}(-4.5,-1.5)(4.5,1)
%        \psaxes[labelFontSize=\scriptstyle,ticksize=-2pt,linewidth=0.3pt]
%            {->}(0,0)(-4.5,-1.5)(4.5,1)
%        \psplot[linecolor=red]{-4.5}{4.5}{x/(EXP(x)-x)}
%    \end{pspicture}
% } 
%
% \noindent
% The horizontal space is equally shared between left margin, interbox space and right margin.
% 
% \medskip
% In the following example the right box has been shifted back 
% to make an overlaping with the left one, what \textsf{picins} cannot do. 
% 
%\dualboxes{\footnotesize
%    $\begin{array}{|*{7}{c|}} \hline
%        x    & -2    & -1    & 0 & 1    & 2    & 3    \\ \hline
%        f(x) & -0.96 & -0.71 & 0 & 0.59 & 0.38 & 0.18 \\  \hline
%    \end{array}$
%    }{\mbox{} \hspace{-3cm}
%    \begin{pspicture}(-4.5,-1.5)(4.5,1)
%        \psaxes[labelFontSize=\scriptstyle,ticksize=-2pt,linewidth=0.3pt]
%            {->}(0,0)(-4.5,-1.5)(4.5,1)
%        \psplot[linecolor=red]{-4.5}{4.5}{x/(EXP(x)-x)}
%    \end{pspicture}
%}
% \begin{verbatim}
% \dualboxes*{\footnotesize
%    $\begin{array}{|*{7}{c|}} \hline
%        x    & -2    & -1    & 0 & 1    & 2    & 3    \\ \hline
%        f(x) & -0.96 & -0.71 & 0 & 0.59 & 0.38 & 0.18 \\ \hline
%    \end{array}$
% }{\mbox{} \hspace{-3cm}
%    \begin{pspicture}(-4.5,-1.5)(4.5,1) % needs the pstricks-add package
%        \psaxes[labelFontSize=\scriptstyle,ticksize=-2pt,linewidth=0.3pt]
%            {->}(0,0)(-4.5,-1.5)(4.5,1)
%        \psplot[linecolor=red]{-4.5}{4.5}{x/(EXP(x)-x)}
%    \end{pspicture}
% }
% \end{verbatim}
%
% \DescribeMacro{\dualboxes*}
% This command has a starred version which eliminates spaces at the beginning and at the
% end of the line, the only remaining space is between the boxes:
% "\dualboxes*"\oarg{pos}\marg{left}\marg{right}.
% \dualboxes*{\parbox{7cm}{
% Here the left part consist of a paragraph box obtained with
% \texttt{\bslash parbox\{7cm\}\{...\}}.
% If we want several paragraphs, a list or a mathematical displayed formula,
% in one of the boxes,
% then we have to put them in a \texttt{minipage} environment.
% }}{\begin{pspicture}(-4.5,-1.5)(4.5,1)
%        \psaxes[labelFontSize=\scriptstyle,ticksize=-2pt,linewidth=0.3pt]
%            {->}(0,0)(-4.5,-1.5)(4.5,1)
%        \psplot[linecolor=red]{-4.5}{4.5}{x/(EXP(x)-x)}
%    \end{pspicture}
% }
%
% \noindent
% Let us indicate that it's unfortunately not possible to use \texttt{verbatim} environments
% (nor the in-line \texttt{\bslash verb} command)
% within "\dualboxes" arguments,
% just as it's not possible for footnotes or margin notes.  
%
% \StopEventually{}
%
% \section{Implementation}
%    \begin{macrocode}
\RequirePackage{ifthen}
\RequirePackage{calc}
\RequirePackage{setspace}
\RequirePackage{xspace}

\newcommand*{\centered}[1]{{\setlength{\parskip}{0pt}\par\noindent\hfill 
    #1\hfill\mbox{}}}
%    \end{macrocode}
% The double braces are necessary here to ensure that the "\parskip" modification applies
% locally within the command and not globally to the rest of the document. 
% \smallskip
%    \begin{macrocode}
\newcommand{\footnotespace}{}
\newcommand{\footnoteindent}{}
\let\footnt\footnote
\renewcommand{\footnote}[2][]{\unskip\footnotespace%
    \ifthenelse{\equal{#1}{}}{
        \unskip\footnt{\footnoteindent\ignorespaces #2}
    }{
        \unskip\footnt[#1]{\footnoteindent\ignorespaces #2}
    }\unskip
}
%    \end{macrocode}
% "\unskip" eliminates undesirable spaces before and "\ignorespaces" after.
% \smallskip
%    \begin{macrocode}
\newlength{\strutheight}
\newcommand*{\vstrut}[2][0pt]{%
    \setlength{\strutheight}{#2}%
    \addtolength{\strutheight}{#1}%
    \unskip
    \ensuremath{\rule[-#1]{0pt}{\strutheight}}%
    \ignorespaces%
}

\newlength{\parindentlength}
\setlength{\parindentlength}{\parindent}
\renewcommand{\indent}{\hspace{\parindentlength}}

\newenvironment*{indentblock}[1][\parindentlength]{
    \begin{list}{}{% 
        \setlength{\leftmargin}{#1}
        \setlength{\itemsep}{0pt}
        \setlength{\topsep}{1ex}            
        \setlength{\partopsep}{0pt}
        }
    \item[] 
    }{\end{list}}

\newlength{\compactlistindent}
\setlength{\compactlistindent}{0.5em}
\newenvironment*{compactlist}[1][\textbullet]{
    \par % sometimes necessary
    \begin{list}{#1\unskip}{% \unskip suppresses the space created by \xspace
        \setlength{\itemsep}{0pt}
        \setlength{\parsep}{0pt}
        \setlength{\topsep}{0ex}
        \setlength{\partopsep}{0pt}
        \setlength{\labelwidth}{1em}
        \setlength{\leftmargin}{\labelwidth}
        \addtolength{\leftmargin}{\labelsep}
        \addtolength{\leftmargin}{\compactlistindent}
        }
    }{\end{list}}

\providecommand{\bul}{\textbullet}
\providecommand{\dash}{\textendash}
\providecommand{\ddash}{\textemdash}
\providecommand{\aster}{\textasteriskcentered}
%    \end{macrocode}
% The command "\asterisk" already exists in the \textsf{mathabx} package.\\
% The following macros need the \textsf{pifont} package.
% \smallskip
%    \begin{macrocode}
\providecommand{\hand}{\ding{43}\xspace}
\providecommand{\checksymb}{\ding{51}\xspace}
\providecommand{\arrowsymb}{\ding{226}\xspace}

\providecommand{\ie}{i.e.\@\xspace} 
\providecommand{\eg}{e.g.\@\xspace}

\newcommand{\@@dualboxes}[3][1]{
    \par\noindent
    \raisebox{\depth-#1\totalheight}{#2} \hfill
    \raisebox{\depth-#1\totalheight}{#3} \smallskip
    }
\newcommand{\@dualboxes}[3][1]{
    \par\noindent \hfill
    \raisebox{\depth-#1\totalheight}{#2} \hfill
    \raisebox{\depth-#1\totalheight}{#3} \hfill\mbox{}\smallskip
    }
\newcommand{\dualboxes}{\@ifstar{\@@dualboxes}{\@dualboxes}}
%    \end{macrocode}
%
% \medskip
% \begin{thebibliography}{9}
% \bibitem{XSP} \emph{The \textsf{xspace} package}, David Carlisle, Morten Høgholm, 
% CTAN v1.13 2014/10/28.
% \bibitem{MKCELL} \emph{The \textsf{makecell} package}, Olga Lapko, CTAN, v0.1e 2009/08/03.
% \bibitem{CENTER} \emph{\textsf{centeredline} -- A macro for centering lines}, Jean-François
% Burnol, CTAN, v1.1 2019/05/03.
% \bibitem{CELLSP} \emph{The \textsf{cellspace} package}, Josselin Noirel, CTAN, v1.8 2019/03/11.
% \bibitem{ENUM} \emph{Customizing lists with the \textsf{enumitem} package}, Javier Bezos, 
% CTAN, v3.9 2019/06/20.
% \bibitem{ARCOL} \emph{The \textsf{arraycols} package}, Antoine Missier, CTAN, v1.0 2019/06/26.
% \bibitem{MSMATH} \emph{\textsf{mismath} -- Miscellaneous mathematical macros}, Antoine Missier,
% CTAN, v1.6 2019/09/06.
% \bibitem{PICINS} \emph{Bilder in \LaTeX -Dokumenten -- PicIns-Benutzerhandbuch},
% Joachim Bleser, Edmund Lang, CTAN, v3.0 sept. 1992.
% \bibitem{COMP} \emph{The \LaTeX\ Companion}. Frank Mittelbach, Michel Goossens, 
% Johannes Braams, David Carlisle, Chris Rowley, 2nd edition, Pearson Education, 2004.
% \end{thebibliography}

% \Finale
\endinput