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Joris van der Hoeven 2012-02-01 21:55:18 +00:00
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devel/scheme/overview/overview-utilities.en.tm
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<TeXmacs|1.0.6.10>
<TeXmacs|1.0.7.14>
<style|tmdoc>
@ -6,10 +6,10 @@
<tmdoc-title|Standard utilities>
Besides the basic concepts from the previous sections, which underly the
scheme API for <TeXmacs>, the <value|scheme> kernel implements several
other utilities and language extensions. In this section, we will briefly
sketch some of them on hand of examples. Further details can be found in
the chapter about <hlink|<TeXmacs> extensions to <value|scheme> and
scheme API for <TeXmacs>, the <scheme> kernel implements several other
utilities and language extensions. In this section, we will briefly sketch
some of them on hand of examples. Further details can be found in the
chapter about <hlink|<TeXmacs> extensions to <scheme> and
utilities|../utils/scheme-utils.en.tm>.
<paragraph*|Regular expressions>
@ -23,39 +23,46 @@
<frac|<with|color|brown|a>|1+<sqrt|<with|color|brown|b>>>
</equation*>
in the current buffer, where <with|mode|math|<with|color|brown|a>> and
<with|mode|math|<with|color|brown|b>> are general expressions, one may use
the following <value|scheme> command:
in the current buffer, where <math|<with|color|brown|a>> and
<math|<with|color|brown|b>> are general expressions, one may use the
following <scheme> command:
<with|prog-language|scheme|prog-session|default|<\session>
<\session|scheme|default>
<\input|scheme] >
(select (buffer-tree) '(:* (:match (frac :%1 (concat "1+" (sqrt
:%1))))))
</input>
</session>>
</session>
<paragraph*|Dialogues>
<TeXmacs> supports several commands for asynchronous evaluation of scheme
commands and interactive dialogues with the user. In general, asynchroneous
instructions have to be encapsulated inside a ``<scm|dialogue> block''. For
instance, when executing the following scheme command, you will be prompted
for two numbers, whose product will be displayed in the footer:
<TeXmacs> supports several commands for interactive dialogues with the
user. For instance, when executing the following scheme command, you will
be prompted for two numbers, whose product will be displayed in the footer:
<\with|prog-language|scheme|prog-session|default>
<\session>
<\input|scheme] >
(dialogue
<\session|scheme|default>
<\input|Scheme] >
(user-ask "First number:"
\ \ (let* ((a (string-\<gtr\>number (dialogue-ask "First number:")))
\ \ (lambda (a)
\ \ \ \ \ \ \ \ \ (b (string-\<gtr\>number (dialogue-ask "Second
number:"))))
\ \ \ \ (user-ask "Second number:"
\ \ \ \ (set-message (number-\<gtr\>string (* a b)) "product")))
\ \ \ \ \ \ (lambda (b)
\ \ \ \ \ \ \ \ (set-message (number-\<gtr\>string (*
(string-\<gtr\>number a)
\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (string-\<gtr\>number
b)))
\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ "product")))))
</input>
<\input|Scheme] >
\;
</input>
</session>
</with>
<paragraph*|User preferences>
@ -65,13 +72,13 @@
call-back routine. The call-back routine is called whenever you change the
corresponding preference. For instance:
<\scheme-fragment>
<\scm-code>
(define-preferences
\ \ ("Gnu's hair color" "brown" notify-gnu-hair-change)
\ \ ("Snail's cruising speed" "1mm/sec" notify-Achilles))
</scheme-fragment>
</scm-code>
Preferences can be set, reset and read using <scm|set-preference>,
<scm|reset-preference> and <scm|get-preference>.
@ -88,7 +95,7 @@
Typically, the declaration of a new format and a converter would look like:
<\scheme-fragment>
<\scm-code>
(define-format blablah
\ \ (:name "Blablah")
@ -102,7 +109,7 @@
\ \ (:require (url-exists-in-path? "bla2tex"))
\ \ (:shell "bla2tex" from "\<gtr\>" to))
</scheme-fragment>
</scm-code>
<tmdoc-copyright|2005|Joris van der Hoeven>