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authorLudovic Courtès <ludo@gnu.org>2019-09-14 23:16:54 +0200
committerLudovic Courtès <ludo@gnu.org>2019-09-23 10:38:44 +0200
commit8ba7fd3cd6962f1c1aaaa5f71eed7f9222094f25 (patch)
tree55b4dd25f2b16a9786f08e331b743f4289ccb053 /doc/guix.texi
parent873f6f1334ab06a69e768a8aea0054404237542f (diff)
channels: Add support for a news file.
* guix/channels.scm (<channel-metadata>)[news-file]: New field. (read-channel-metadata): Set the 'news-file' field. (read-channel-metadata-from-source): Likewise. (<channel-news>, <channel-news-entry>): New record types. (sexp->channel-news-entry, read-channel-news) (channel-news-for-commit): New procedures. * guix/tests/git.scm (populate-git-repository): For 'add', allow CONTENTS to be a procedure. * tests/channels.scm ("channel-news, no news") ("channel-news, one entry"): New tests. * doc/guix.texi (Channels): Document it.
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diff --git a/doc/guix.texi b/doc/guix.texi
index af1903f6ff..cd108faa8f 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -3991,6 +3991,68 @@ add a meta-data file @file{.guix-channel} that contains:
(directory "guix"))
@end lisp
+@cindex news, for channels
+@subsection Writing Channel News
+
+Channel authors may occasionally want to communicate to their users
+information about important changes in the channel. You'd send them all
+an email, but that's not convenient.
+
+Instead, channels can provide a @dfn{news file}; when the channel users
+run @command{guix pull}, that news file is automatically read and
+@command{guix pull --news} can display the announcements that correspond
+to the new commits that have been pulled, if any.
+
+To do that, channel authors must first declare the name of the news file
+in their @file{.guix-channel} file:
+
+@lisp
+(channel
+ (version 0)
+ (news-file "etc/news.txt"))
+@end lisp
+
+The news file itself, @file{etc/news.txt} in this example, must look
+something like this:
+
+@lisp
+(channel-news
+ (version 0)
+ (entry (commit "d894ab8e9bfabcefa6c49d9ba2e834dd5a73a300")
+ (title (en "Fixed terrible bug")
+ (fr "Oh la la"))
+ (body (en "@@emph@{Good news@}! It's fixed!")
+ (eo "Certe ĝi pli bone funkcias nun!")))
+ (entry (commit "bdcabe815cd28144a2d2b4bc3c5057b051fa9906")
+ (title (en "Added a great package")
+ (ca "Què vol dir guix?"))
+ (body (en "Don't miss the @@code@{hello@} package!"))))
+@end lisp
+
+The file consists of a list of @dfn{news entries}. Each entry is
+associated with a commit: it describes changes made in this commit,
+possibly in preceding commits as well. Users see entries only the first
+time they obtain the commit the entry refers to.
+
+The @code{title} field should be a one-line summary while @code{body}
+can be arbitrarily long, and both can contain Texinfo markup
+(@pxref{Overview,,, texinfo, GNU Texinfo}). Both the title and body are
+a list of language tag/message tuples, which allows @command{guix pull}
+to display news in the language that corresponds to the user's locale.
+
+If you want to translate news using a gettext-based workflow, you can
+extract translatable strings with @command{xgettext} (@pxref{xgettext
+Invocation,,, gettext, GNU Gettext Utilities}). For example, assuming
+you write news entries in English first, the command below creates a PO
+file containing the strings to translate:
+
+@example
+xgettext -o news.po -l scheme -ken etc/news.scm
+@end example
+
+To sum up, yes, you could use your channel as a blog. But beware, this
+is @emph{not quite} what your users might expect.
+
@subsection Replicating Guix
@cindex pinning, channels