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doc: Add elaborate package search example. 

* doc/guix.texi (Invoking guix package): Add elaborate --search example
using recsel and sexes.
master
Ludovic Courtès 2016-01-07 14:46:11 +01:00
parent c8d969b58f
commit b110869dd3
1 changed files with 14 additions and 0 deletions
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@ -1434,6 +1434,7 @@ availability of packages:
@item --search=@var{regexp}
@itemx -s @var{regexp}
@cindex searching for packages
List the available packages whose name, synopsis, or description matches
@var{regexp}. Print all the meta-data of matching packages in
@code{recutils} format (@pxref{Top, GNU recutils databases,, recutils,
@ -1477,6 +1478,19 @@ that deal with printed circuit boards; removing the angle brackets
around @code{board} would further add packages that have to do with
keyboards.
And now for a more elaborate example. The following command searches
for cryptographic libraries, filters out Haskell, Perl, Python, and Ruby
libraries, and prints the name and synopsis of the matching packages:
@example
$ guix package -s crypto -s library | \
recsel -e '! (name ~ "^(ghc|perl|python|ruby)")' -p name,synopsis
@end example
@noindent
@xref{Selection Expressions,,, recutils, GNU recutils manual}, for more
information on @dfn{selection expressions} for @code{recsel -e}.
@item --show=@var{package}
Show details about @var{package}, taken from the list of available packages, in
@code{recutils} format (@pxref{Top, GNU recutils databases,, recutils, GNU