Différences

Ci-dessous, les différences entre deux révisions de la page.

--- 2_programmation:macros:que_sont_les_macros [2018/06/03 15:18]
samcarter
+++ 2_programmation:macros:que_sont_les_macros [2018/12/02 23:45]
jejust
@@ Ligne 1: / Ligne 1: @@
----
+====== What are (TeX) macros ======
-title: What are (TeX) macros
-category: concepts
-permalink: /FAQ-whatmacros
-date: 2014-06-10
----
-TeX is a _macro processor_: this is a computer-science-y term
+TeX is a //macro processor//: this is a computer-science-y term
 meaning "text expander" (more or less); TeX typesets text as it
-goes along, but _expands_ each macro it finds.  TeX's macros
+goes along, but //expands// each macro it finds.  TeX's macros
 may include instructions to TeX itself, on top of the simple text
 generation one might expect.
-Macros are a _good thing_, since they allow the user to
+Macros are a //good thing//, since they allow the user to
 manipulate documents according to context.  For example, the macro
-`\TeX` is usually defined to produce "TEX" with the "E" lowered
+''\TeX'' is usually defined to produce "TEX" with the "E" lowered
 (the original idea was Knuth's),
 but in these FAQs the default definition of the macro is
-overridden, and it simply expands to the letters "TeX".  (_You_
+overridden, and it simply expands to the letters "TeX".  (//You//
 may not think this a good thing, but the author of the macros has his
-reasons&nbsp;&ndash; see [TeX-related logos](FAQ-logos).)
+reasons -- see [[FAQ-logos|TeX-related logos]].)
-Macro names are conventionally built from a `\`
+Macro names are conventionally built from a ''\''
 followed by a sequence of letters, which may be upper or lower case
-(as in `\TeX`, mentioned above).  They may also be
+(as in ''\TeX'', mentioned above).  They may also be
-`<any single character>`, which allows all
+''<any single character>'', which allows all
 sorts of oddities (many built in to most TeX macro sets, all the
-way up from the apparently simple `\ ` meaning "insert a space
+way up from the apparently simple ''\ '' meaning "insert a space
 here").
 Macro programming can be a complicated business, but at their very
-simplest they need little introduction&nbsp;&mdash; you'll hardly need to be
+simplest they need little introduction --- you'll hardly need to be
 told that:
-```latex
+<code latex>
 \def\foo{bar}
-```
+</code>
-replaces each instance of `\foo` with the text "bar".  The
+replaces each instance of ''\foo'' with the text "bar".  The
-command `\def` is Plain TeX syntax for defining commands;
+command ''\def'' is Plain TeX syntax for defining commands;
-LaTeX offers a macro `\newcommand` that goes some way towards
+LaTeX offers a macro ''\newcommand'' that goes some way towards
 protecting users from themselves, but basically does the same thing:
-```latex
+<code latex>
 \newcommand{\foo}{bar}
-```
+</code>
 Macros may have "arguments" , which are used to substitute for marked
 bits of the macro expansion:
-```latex
+<code latex>
 \def\foo#1{This is a #1 bar}
 ...
 \foo{2/4}.
-```
+</code>
 which produces:
   This is a 2/4 bar.
 or, in LaTeX speak:
-```latex
+<code latex>
 \newcommand{\foo}[1]{This is a #1 bar}
 ...
 \foo{3/4}.
-```
+</code>
 which produces:
   This is 3/4 bar.
@@ Ligne 62: / Ligne 62: @@
 You will have noticed that the arguments, above, were enclosed in
-braces (`{`&hellip;`}`); this is the
+braces (''{''...''}''); this is the
 normal way of typing arguments, though TeX is enormously flexible,
 and you may find all sorts of other ways of passing arguments (if you
@@ Ligne 69: / Ligne 69: @@
 Macro writing can get very complicated, very quickly.  If you are a
 beginner (La)TeX programmer, you are well advised to read something
-along the lines of the [TeXbook](FAQ-tex-books); once you're under
+along the lines of the [[FAQ-tex-books|TeXbook]]; once you're under
-way, [TeX by Topic](FAQ-ol-books) is possibly a more satisfactory
+way, [[FAQ-ol-books|TeX by Topic]] is possibly a more satisfactory
 choice.  Rather a lot of the answers in these FAQs tell you
 about various issues of how to write macros.
+---
+//Source:// [[faquk>FAQ-whatmacros|What are (TeX) macros]]
+{{htmlmetatags>metatag-keywords=(LaTeX,concepts)
+metatag-og:title=(What are (TeX) macros)
+metatag-og:site_name=(FAQ LaTeX francophone)
+}}