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index 87723105d1aeeab3cc9918ffc80503f4291e749c..cf4ee2ebe5d8a10e23d129a0b8e7788de3f2dcf1 100644 (file)
-------
Certain operations by git can be influenced by assigning
-particular attributes to a path. Currently, three operations
-are attributes-aware.
+particular attributes to a path. Currently, the following
+operations are attributes-aware.
Checking-out and checking-in
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^^^^^^^
When the attribute `ident` is set to a path, git replaces
-`$ident$` in the blob object with `$ident:`, followed by
+`$Id$` in the blob object with `$Id:`, followed by
40-character hexadecimal blob object name, followed by a dollar
sign `$` upon checkout. Any byte sequence that begins with
-`$ident:` and ends with `$` in the worktree file is replaced
-with `$ident$` upon check-in.
-
-
-Interaction between checkin/checkout attributes
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-In the check-in codepath, the worktree file is first converted
-with `ident` (if specified), and then with `crlf` (again, if
-specified and applicable).
-
-In the check-out codepath, the blob content is first converted
-with `crlf`, and then `ident`.
+`$Id:` and ends with `$` in the worktree file is replaced
+with `$Id$` upon check-in.
`filter`
^^^^^^^^
-A `filter` attribute can be set to a string value. This names
+A `filter` attribute can be set to a string value that names a
filter driver specified in the configuration.
-A filter driver consists of `clean` command and `smudge`
+A filter driver consists of a `clean` command and a `smudge`
command, either of which can be left unspecified. Upon
-checkout, when `smudge` command is specified, the command is fed
-the blob object from its standard input, and its standard output
-is used to update the worktree file. Similarly, `clean` command
-is used to convert the contents of worktree file upon checkin.
+checkout, when the `smudge` command is specified, the command is
+fed the blob object from its standard input, and its standard
+output is used to update the worktree file. Similarly, the
+`clean` command is used to convert the contents of worktree file
+upon checkin.
-Missing filter driver definition in the config is not an error
+A missing filter driver definition in the config is not an error
but makes the filter a no-op passthru.
The content filtering is done to massage the content into a
shape that is more convenient for the platform, filesystem, and
-the user to use. The keyword here is "more convenient" and not
-"turning something unusable into usable". In other words, it is
-"hanging yourself because we gave you a long rope" if your
-project uses filtering mechanism in such a way that it makes
-your project unusable unless the checkout is done with a
-specific filter in effect.
+the user to use. The key phrase here is "more convenient" and not
+"turning something unusable into usable". In other words, the
+intent is that if someone unsets the filter driver definition,
+or does not have the appropriate filter program, the project
+should still be usable.
Interaction between checkin/checkout attributes
~~~~~~~~~~~~~~~~~~~~
The attribute `diff` affects if `git diff` generates textual
-patch for the path or just says `Binary files differ`.
+patch for the path or just says `Binary files differ`. It also
+can affect what line is shown on the hunk header `@@ -k,l +n,m @@`
+line.
Set::
Diff is shown using the specified custom diff driver.
The driver program is given its input using the same
calling convention as used for GIT_EXTERNAL_DIFF
- program.
+ program. This name is also used for custom hunk header
+ selection.
Defining a custom diff driver
See gitlink:git[7] for details.
+Defining a custom hunk-header
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Each group of changes (called "hunk") in the textual diff output
+is prefixed with a line of the form:
+
+ @@ -k,l +n,m @@ TEXT
+
+The text is called 'hunk header', and by default a line that
+begins with an alphabet, an underscore or a dollar sign is used,
+which matches what GNU `diff -p` output uses. This default
+selection however is not suited for some contents, and you can
+use customized pattern to make a selection.
+
+First in .gitattributes, you would assign the `diff` attribute
+for paths.
+
+------------------------
+*.tex diff=tex
+------------------------
+
+Then, you would define "diff.tex.funcname" configuration to
+specify a regular expression that matches a line that you would
+want to appear as the hunk header, like this:
+
+------------------------
+[diff "tex"]
+ funcname = "^\\(\\\\\\(sub\\)*section{.*\\)$"
+------------------------
+
+Note. A single level of backslashes are eaten by the
+configuration file parser, so you would need to double the
+backslashes; the pattern above picks a line that begins with a
+backslash, and zero or more occurrences of `sub` followed by
+`section` followed by open brace, to the end of line.
+
+There are a few built-in patterns to make this easier, and `tex`
+is one of them, so you do not have to write the above in your
+configuration file (you still need to enable this with the
+attribute mechanism, via `.gitattributes`). Another built-in
+pattern is defined for `java` that defines a pattern suitable
+for program text in Java language.
+
+
Performing a three-way merge
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
the attributes given to path `t/abc` are computed as follows:
1. By examining `t/.gitattributes` (which is in the same
- diretory as the path in question), git finds that the first
+ directory as the path in question), git finds that the first
line matches. `merge` attribute is set. It also finds that
the second line matches, and attributes `foo` and `bar`
are unset.
and `bar` attributes should be given to this path, so it
leaves `foo` and `bar` unset. Attribute `baz` is set.
-3. Finally it examines `$GIT_DIR/info/gitattributes`. This file
+3. Finally it examines `$GIT_DIR/info/attributes`. This file
is used to override the in-tree settings. The first line is
a match, and `foo` is set, `bar` is reverted to unspecified
state, and `baz` is unset.
-As the result, the attributes assignement to `t/abc` becomes:
+As the result, the attributes assignment to `t/abc` becomes:
----------------------------------------------------------------
foo set to true