mirror of https://github.com/texmacs/doc.git
82 lines
3.6 KiB
Plaintext
82 lines
3.6 KiB
Plaintext
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<TeXmacs|1.0.4>
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<style|tmdoc>
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<\body>
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<tmdoc-title|Customizing arbitrary tags>
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Imagine that you want to change the rendering of a given tag, like
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<markup|lemma>. As a general rule, <TeXmacs> provides a set of well-chosen
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macros which can be customized by the user so as to obtain the desired
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effect. For instance, as we have seen <hyper-link|above|../customize/customize-theorems.en.tm>,
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you should use modify one of the macros <markup|render-theorem>,
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<markup|theorem-name> or <markup|theorem-sep> in order to customize the
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rendering of <markup|lemma> and all other theorem-like environments.
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However, in some cases, it may not be clear which ``well-chosen'' macro to
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customize. If we just wanted to change the presentation of lemmas and not
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of any other theorem-like environments, then we clearly cannot modify
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<markup|render-theorem>, <markup|theorem-name> or <markup|theorem-sep>. In
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other cases, the user may not want to invest his time in completely
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understanding the macro hierarchy of <TeXmacs>, and find out about the
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existence of <markup|render-theorem>, <markup|theorem-name> and
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<markup|theorem-sep>.
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So imagine that you want all lemmas to appear in red. One thing \ you can
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always do is copy the original definition of lemmas in a safe place and
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redefine the lemma macro on top of the original definition:
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<\tm-fragment>
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<\inactive*>
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<assign|orig-lemma|<value|lemma>>
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<assign|lemma|<macro|body|<with|color|red|<orig-lemma|<arg|body>>>>>
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</inactive*>
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</tm-fragment>
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Alternatively, if only the text inside the lemma should be rendered in red,
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then you may do:
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<\tm-fragment>
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<\inactive*>
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<assign|orig-lemma|<value|lemma>>
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<assign|lemma|<macro|body|<orig-lemma|<with|color|red|<arg|body>>>>>
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</inactive*>
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</tm-fragment>
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Of course, you have to be careful that the name <markup|orig-lemma> is not
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already in use.
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Another frequent situation is that you only want to modify the rendering of
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a tag when it is used inside another one. On the web, the <em|Cascading
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Style Sheet> language (<acronym|CSS>) provides a mechanism for doing this.
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In <TeXmacs>, you may simulate this behaviour by redefining macros inside a
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<markup|with>. For instance, imagine that we want the inter-paragraph space
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inside lists inside theorem-like environments to vanish. Then we may use:
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<\tm-fragment>
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<\inactive*>
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<assign|orig-render-theorem|<value|render-theorem>>
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<assign|render-theorem|<macro|name|body|<with|orig-render-list|<value|render-list>|<with|render-list|<macro|x|<with|par-par-sep|0fn|<orig-render-list|<arg|x>>>>|<style-with|src-compact|none|<orig-render-theorem|<arg|name>|<arg|body>>>>>>>
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</inactive*>
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</tm-fragment>
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On the one hand side, this mechanism is a bit more complex than
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<acronym|CSS>, where it suffices to respecify the <src-var|par-par-sep>
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attribute of lists inside theorems. On the other hand, it is also more
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powerful, since the <markup|render-theorem> macro applies to all
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theorem-like environments at once. Furthermore, if the above mechanism is
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to be used frequently, then real hackers may simplify the notations using
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further macro magic.
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<tmdoc-copyright|1998--2004|Joris van der Hoeven>
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<tmdoc-license|Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License, Version 1.1
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or any later version published by the Free Software Foundation; with no
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Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled "GNU Free
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Documentation License".>
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</body>
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