git/Documentation/i18n.txt
Alexander Gavrilov 69cd8f6342 builtin-blame: Reencode commit messages according to git-log rules.
Currently git-blame outputs text from the commit messages
(e.g. the author name and the summary string) as-is, without
even providing any information about the encoding used for
the data. It makes interpreting the data in multilingual
environment very difficult.

This commit changes the blame implementation to recode the
messages using the rules used by other commands like git-log.
Namely, the target encoding can be specified through the
i18n.commitEncoding or i18n.logOutputEncoding options, or
directly on the command line using the --encoding parameter.

Converting the encoding before output seems to be more
friendly to the porcelain tools than simply providing the
value of the encoding header, and does not require changing
the output format.

If anybody needs the old behavior, it is possible to
achieve it by specifying --encoding=none.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-10-21 14:09:34 -07:00

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At the core level, git is character encoding agnostic.
- The pathnames recorded in the index and in the tree objects
are treated as uninterpreted sequences of non-NUL bytes.
What readdir(2) returns are what are recorded and compared
with the data git keeps track of, which in turn are expected
to be what lstat(2) and creat(2) accepts. There is no such
thing as pathname encoding translation.
- The contents of the blob objects are uninterpreted sequence
of bytes. There is no encoding translation at the core
level.
- The commit log messages are uninterpreted sequence of non-NUL
bytes.
Although we encourage that the commit log messages are encoded
in UTF-8, both the core and git Porcelain are designed not to
force UTF-8 on projects. If all participants of a particular
project find it more convenient to use legacy encodings, git
does not forbid it. However, there are a few things to keep in
mind.
. 'git-commit' and 'git-commit-tree' issues
a warning if the commit log message given to it does not look
like a valid UTF-8 string, unless you explicitly say your
project uses a legacy encoding. The way to say this is to
have i18n.commitencoding in `.git/config` file, like this:
+
------------
[i18n]
commitencoding = ISO-8859-1
------------
+
Commit objects created with the above setting record the value
of `i18n.commitencoding` in its `encoding` header. This is to
help other people who look at them later. Lack of this header
implies that the commit log message is encoded in UTF-8.
. 'git-log', 'git-show', 'git-blame' and friends look at the
`encoding` header of a commit object, and try to re-code the
log message into UTF-8 unless otherwise specified. You can
specify the desired output encoding with
`i18n.logoutputencoding` in `.git/config` file, like this:
+
------------
[i18n]
logoutputencoding = ISO-8859-1
------------
+
If you do not have this configuration variable, the value of
`i18n.commitencoding` is used instead.
Note that we deliberately chose not to re-code the commit log
message when a commit is made to force UTF-8 at the commit
object level, because re-coding to UTF-8 is not necessarily a
reversible operation.