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
|
@q Changes for CWEB in TeX Live from numerous contributors. @>
@q This file is in the Public Domain. @>
@q Most of the original Kpathsea changes by Wlodek Bzyl and Olaf Weber @>
@q were merged with the set of change files of the CWEBbin project; @>
@q see https://github.com/ascherer/cwebbin for the original parts. @>
@q This stripped change file {comm,ctang,cweav,ctwill,cwebman}-w2c.ch @>
@q has been created from the elaborate set of change files @>
@q {comm,ctang,cweav,cwebman}-patch.ch, @>
@q {comm,cweav,cwebman}-extensions.ch, {comm,ctang,cweav}-output.ch, @>
@q {comm,ctang,cweav}-i18n.ch, and cweav-twill.ch for CTWILL, and @>
@q {comm,ctang,cweav,ctwill,cwebman}-texlive.ch with the 'tie' processor @>
@q and is used as a monolithic changefile for {common,ctangle,cweave}.w @>
@q and cwebman.tex in TeX Live. @>
@q Please send comments, suggestions, etc. to tex-k@@tug.org. @>
@x
\input cwebmac
\acrofalse\pdffalse\pdftexfalse
@y
\input cwebmac
@z
@x
\def\page{\box255 } \normalbottom
@y
\let\page=\pagebody \raggedbottom
\newcount\footnotecount \footnotecount 1\relax
\def\cwebfootnote#1{\footnote{${}^{\the\footnotecount}$}{#1}%
\advance\footnotecount by 1\relax}
@z
@x
\outer\def\section #1.{\penalty-500\bigskip
\centerline{\sectionfont\def\.##1{{\twelvett##1}} #1}\nobreak\vskip 6pt
\everypar{\hskip-\parindent\everypar{}}}
@y
\ifacro
\pdfpagewidth=\pagewidth \advance\pdfpagewidth by 2cm
\pdfpageheight=\pageheight \advance\pdfpageheight by 3cm
\ifpdftex \pdfhorigin=1cm \pdfvorigin=1cm
\else \advance\pdfpageheight by 1cm \global\pageshift=-1.54cm
\global\hoffset=-1.54cm \global\voffset=-1.54cm \fi
\fi
\newcount\destcount \destcount=1\relax
\def\subsections{0}
\outer\def\section #1.{\penalty-500\bigskip
\centerline{\sectionfont\def\.##1{{\twelvett##1}}
\ifacro\vbox to 0pt{\kern-2.5ex\relax
\ifpdftex\pdfdest num \destcount fitbh\relax
\else\special{pdf: dest (\the\destcount) [ @thispage /FitBH @ypos ]}\fi
\def\.##1{##1}\def\TeX{TeX}%
\ifpdftex\pdfoutline goto num \destcount
\ifnum\subsections>0 count -\subsections\fi {#1}\relax
\else\special{pdf: outline 0 << /Title (#1)
/A << /S /GoTo /D (\the\destcount) >> >>}\fi
\gdef\subsections{0}%
\global\advance\destcount by 1\relax
\kern2.5ex\relax
}\fi #1}\nobreak\vskip 6pt
\everypar{\hskip-\parindent\everypar{}}}
\def\appA{15}
\def\appB{16}
\def\appC{17}
\def\Appendix#1{\leavevmode
\ifacro\ifpdftex
\pdfstartlink attr{/Border[0 0 0]} goto num\csname app#1\endcsname\relax
\Blue\hbox{Appendix}~#1\Black
\pdfendlink
\else
\setbox0=\hbox{\special{pdf: bc [ \pdflinkcolor ]}{\hbox{Appendix}~#1}%
\special{pdf: ec}}\special{pdf: ann width \thewidth height \theheight
depth \thedepth << /Type /Annot /Subtype /Link /Border [0 0 0]
/A << /S /GoTo /D (\csname app#1\endcsname) >> >>}\box0\relax
\fi\else Appendix~#1\fi}
\newcount\subdestcount \subdestcount=151\relax
\outer\def\subsection #1.{\ifacro
\ifpdftex\pdfdest num \subdestcount fitbh\relax
\pdfoutline goto num \subdestcount {#1}\relax
\else\special{pdf: dest (\the\subdestcount) [ @thispage /FitBH @ypos ]}%
\special{pdf: outline 1 << /Title (#1)
/A << /S /GoTo /D (\the\subdestcount) >> >>}\fi
\global\advance\subdestcount by 1\relax
\fi}
@z
@x
\def\runninghead{{\tentt CWEB} USER MANUAL (VERSION 4.1)}
@y
\def\Kpathsea/{{\mc KPATHSEA\spacefactor1000}}
\def\runninghead{{\tentt CWEB} USER MANUAL (4.1 [\TeX~Live])}
@z
@x
\vskip 18pt\centerline{(Version 4.1 --- February 2021)}
@y
\vskip 18pt\centerline{(Version 4.1 --- February 2021)%
\footnote*{This document describes the extended \.{CWEB} (4.1 [\TeX~Live]).}}
@z
@x
Internet page \.{http://www-cs-faculty.stanford.edu/\char`\~knuth/cweb.html}
@y
Internet page
\pdfURL{\.{http://www-cs-faculty.stanford.edu/\char`\~knuth/cweb.html}}%
{http://www-cs-faculty.stanford.edu/\TILDE/knuth/cweb.html}
@z
@x
\.{https://github.com/ascherer/cweb} with the really current news.
@y
\pdfURL{\.{https://github.com/ascherer/cweb}}%
{https://github.com/ascherer/cweb}
with the really current news.
@z
@x
should be sent to the \TeX-related mailing list \.{tex-k@tug.org}.
@y
should be sent to the \TeX-related mailing list
\pdfURL{\.{tex-k@tug.org}}%
{mailto:tex-k@tug.org}.
@z
@x
email address in a \.{CWEB} file (e.g., \.{tex-k@@tug.org}).
@y
email address in a \.{CWEB} file (e.g.,
\pdfURL{\.{tex-k@@tug.org}}%
{mailto:tex-k@tug.org}).
@z
@x
it cannot find them in the current directory.
@y
it cannot find them in the current directory.%
\cwebfootnote{\acrofalse In this extended implementation, if an \.{@i}nclude
file can not be found in the current directory, \.{CWEB} will use the
conventions of the \Kpathsea/ library as outlined in section~\X91:File lookup
with \Kpathsea/\X~of \pdfURL{appendix~D}{common-changes.pdf} to look for it.
% FIXME
(This is true for any other input or change file lookup.)}
@z
@x
output by \.{CWEAVE}. (On by default.) (Has no effect on \.{CTANGLE}.)
@y
output by \.{CWEAVE}. (On by default.) (Has no effect on \.{CTANGLE}.)%
\cwebfootnote{This extended version of \.{CWEB} adds the following options
to the list:
\hfil\smallskip
\option d Set the debugging variable \\{kpathsea\_debug} to the numeric
value $N\in[0,127]$ of this option. See section~93 % FIXME
of \pdfURL{appendix~D}{common-changes.pdf} for details.
\hfil\vskip\normallineskip
\option i Indent parameters in function declarations. This causes the
formal parameter declarations in function heads to be indented. (On by
default; \.{-i} typesets declarations flush left; some people think this
to be more logical than indenting them) (Has no effect on \.{CTANGLE}.)
\hfil\vskip\normallineskip
\option l This option takes the string of characters to its right as its
argument to switch between different user languages and macro packages.
For example, if you call \.{CWEAVE} with the `\.{+ld}' (or `\.{-ld}') option,
the German \.{CWEB} macros \.{dcwebmac.tex} will be loaded in the first line
of output instead of the English ones. To avoid conflicts, the Danish
macros could be called \.{dkcwebmac.tex} and would be included by `\.{+ldk}'.
(Off by default) (Has no effect on \.{CTANGLE}.)
\hfil\vskip\normallineskip
\option o Separate declarations and the first statement in a function block.
\.{CWEAVE} automatically inserts a bit of extra space. (On by default.)
(Has no effect on \.{CTANGLE}.)
\hfil\vskip\normallineskip
\option t Overwrite output files with temporary output only if changes occur.
(On by default.)}
@z
@x
Sometimes things don't work as smoothly, and you get a bunch of
@y
\acrofalse\pdftexfalse\pdffalse
Sometimes things don't work as smoothly, and you get a bunch of
@z
@x
`$\\{main}(\\{argc},\39\\{argv}{}$)'.
@y
`$\\{main}(\\{argc},\39\\{argv}{}$)'.
\ifx\pdf+\pdftrue\fi
\ifx\pdfoutput\undefined \pdftexfalse \else\ifnum\pdfoutput=0 \pdftexfalse
\else \pdftextrue \pdfoutput=1\fi\fi
\ifpdf\acrotrue\fi \ifpdftex\acrotrue\fi
@z
@x
\section Hypertext and hyperdocumentation.
@y
\vfill\eject
\section Hypertext and hyperdocumentation.
@z
@x
the program sources at \.{ftp://ftp.cs.stanford.edu/pub/ctwill}.
@y
the program sources at
\pdfURL{\.{ftp://ftp.cs.stanford.edu/pub/ctwill}}%
{ftp://ftp.cs.stanford.edu/pub/ctwill}.%
\cwebfootnote{\TeX~Live comes with an up-to-date \.{ctwill} executable -- and
its associated helpers -- out of the box.}
@z
@x
As an example of a real program written in \.{CWEB}, Appendix~A
@y
As an example of a real program written in \.{CWEB}, \Appendix A
@z
@x
Appendix B is the file that sets \TEX/ up to accept
the output of \.{CWEAVE}, and Appendix~C discusses how to use some of those
@y
\Appendix B is the file that sets \TEX/ up to accept
the output of \.{CWEAVE}, and \Appendix C discusses how to use some of those
@z
@x
appendices D, E, and~F, which exhibit the complete source code for
\.{CTANGLE} and \.{CWEAVE}.
\vfil\eject\titletrue
@y
appendices \pdfURL{D}{common.pdf}, \pdfURL{E}{ctangle.pdf},
and~\pdfURL{F}{cweave.pdf}, which exhibit the complete source code for
\.{CTANGLE} and \.{CWEAVE}.%
\cwebfootnote{Actually, \pdfURL{Appendix~D}{common.pdf} contains the source
code for \.{COMMON}, and the additional \pdfURL{Appendix~G}{ctwill.pdf}
exhibits the source code for \.{CTWILL}, which is based on \.{CWEAVE}.}
\eject\titletrue
@z
@x
\section Appendix A: Excerpts from a \.{CWEB} Program.
@y
\def\subsections{4}
\section Appendix A: Excerpts from a \.{CWEB} Program.
\subsection CWEB file format.
@z
@x
generated sections 27--31 of the file \.{common.w}, which contains
@y
generated sections 27--31 of the file
\pdfURL{\.{common.w}}{common.pdf}, which contains
@z
@x
\def\runninghead{APPENDIX A --- TRANSLATION BY {\tentt CTANGLE}}
@y
\def\runninghead{APPENDIX A --- TRANSLATION BY {\tentt CTANGLE}}
\subsection Translation by CTANGLE.
@z
@x
\def\runninghead{APPENDIX A --- TRANSLATION BY {\tentt CWEAVE}}
@y
\def\runninghead{APPENDIX A --- TRANSLATION BY {\tentt CWEAVE}}
\subsection Translation by CWEAVE.
@z
@x
\def\runninghead{APPENDIX A --- FINAL DOCUMENT}
And here's what the same excerpt looks like when typeset.
(Can you spot the typographical nicety used in the \.{CWEB} code?)
\let\K=\leftarrow
@y
\def\runninghead{APPENDIX A --- FINAL DOCUMENT}
\subsection Final document.
\acrofalse\pdftexfalse\pdffalse
And here's what the same excerpt looks like when typeset.
(Can you spot the typographical niceties used in the \.{CWEB} code?)
\let\K=\leftarrow
\def\C#1{\5\5\quad$\triangleright\,${\cmntfont#1}$\,\triangleleft$}
@z
@x
\vfil\eject\titletrue
@y
\vfil\eject\titletrue
\ifx\pdf+\pdftrue\fi
\ifx\pdfoutput\undefined \pdftexfalse \else\ifnum\pdfoutput=0 \pdftexfalse
\else \pdftextrue \pdfoutput=1\fi\fi
\ifpdf\acrotrue\fi \ifpdftex\acrotrue\fi
@z
@x
\.{ { }\\vskip 15pt \\centerline\{(Version 4.1)\}{ }\\vfill\}}\cr}$$
@y
\.{ { }\\vskip 15pt \\centerline\{(Version 4.1)\}{ }\\vfill\}}\cr}$$
@z
@x
if you have a duplex printer. Appendices D, E, and F of the complete
@y
if you have a duplex printer. Appendices \pdfURL{D}{common.pdf},
\pdfURL{E}{ctangle.pdf}, and \pdfURL{F}{cweave.pdf}\cwebfootnote{And
\pdfURL{Appendix~G}{ctwill.pdf}.} of the complete
@z
@x
\point 20. Furthermore, group titles can be converted to an arbitrary
@y
\vfill\eject
\point 20. Furthermore, group titles can be converted to an arbitrary
@z
|
