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<?xml version="1.0" encoding="UTF-8"?>
<guide self="function-reference/query-functions/">
<chapter>
<title>Query functions reference</title>
<body>
<p>
The following functions, which are provided by <c>ebuild.sh</c>, can be used to
query variables and similar state.
</p>
<table>
<tr>
<th>
Function
</th>
<th>
Details
</th>
</tr>
<tr>
<ti>
<c>use flagname</c>
</ti>
<ti>
Returns a true value if <c>flagname</c> is enabled, false otherwise.
The condition is inverted if prefixed with an exclamation mark,
<c>!flagname</c>.
It is guaranteed that <c>use</c> produces no output.
</ti>
</tr>
<tr>
<ti>
<c>useq flagname</c>
</ti>
<ti>
Deprecated synonym for <c>use</c>.
</ti>
</tr>
<tr>
<ti>
<c>usev flagname [true output]</c>
</ti>
<ti>
As <c>use</c>, but also echoes <c>flagname</c> upon success. In EAPI 8
and later, echoes the second argument instead, if it is specified.
</ti>
</tr>
<tr>
<ti>
<c>usex flag [true output] [false output] [true suffix] [false suffix]</c>
</ti>
<ti>
If <c>flag</c> is enabled, echo [true output][true suffix], otherwise
echo [false output][false suffix]. If unspecified, true and false outputs
are equal to "yes" and "no" respectively. The suffixes default to empty
strings.
</ti>
</tr>
<tr>
<ti>
<c>use_enable flag str val</c>
</ti>
<ti>
Echoes either <c>--enable-str=val</c> or <c>--disable-str</c> depending upon <c>useq flag</c>.
If <c>str</c> is not specified, uses <c>flag</c> instead. If <c>val</c> is not specified, omits
the assignment part.
</ti>
</tr>
<tr>
<ti>
<c>use_with flag str val</c>
</ti>
<ti>
As <c>use_enable</c>, but <c>--with-</c> or <c>--without-</c>.
</ti>
</tr>
<tr>
<ti>
<c>in_iuse flag</c>
</ti>
<ti>
Returns true if the ebuild can use <c>flag</c> in <c>use</c> queries,
false otherwise.
</ti>
</tr>
<tr>
<ti>
<c>has word item...</c>
</ti>
<ti>
Returns true if <c>word</c> is found in the list of subsequent
<c>item</c> arguments (example: <c>if has ccache $FEATURES ; then</c>).
It is guaranteed that <c>has</c> produces no output.
</ti>
</tr>
<tr>
<ti>
<c>hasq word item...</c>
</ti>
<ti>
Deprecated synonym for <c>has</c>.
</ti>
</tr>
<tr>
<ti>
<c>hasv word item...</c>
</ti>
<ti>
As <c>has</c>, echoes <c>word</c> on success.
</ti>
</tr>
<tr>
<ti>
<c>best_version [option] pkg</c>
</ti>
<ti>
Echoes category, name and version of the highest version of <c>pkg</c>
that is currently installed.
Example: <c>best_version app-editors/emacs:24</c> will output
<c>app-editors/emacs-24.5-r3</c>.
(EAPI=7) An option may also be specified to query certain types of dependencies.
<c>-b</c> for <c>BDEPEND</c>
<c>-d</c> for <c>DEPEND</c>
<c>-r</c> (default) for <c>RDEPEND</c>
</ti>
</tr>
<tr>
<ti>
<c>has_version [option] pkg[flag]</c>
</ti>
<ti>
True if <c>pkg</c> (can include
<uri link="::general-concepts/dependencies/#Version specifiers"/> and
<uri link="::general-concepts/dependencies/#Built with USE dependencies"/>)
is installed. Example: <c>has_version
"=app-editors/nano-2.5.3[nls,spell]"</c>.
(EAPI=7) An option may also be specified to query certain types of dependencies.
<c>-b</c> for <c>BDEPEND</c>
<c>-d</c> for <c>DEPEND</c>
<c>-r</c> (default) for <c>RDEPEND</c>
</ti>
</tr>
</table>
</body>
</chapter>
</guide>
|
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