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authorJunio C Hamano <gitster@pobox.com>2011-01-13 11:34:56 -0800
committerJunio C Hamano <gitster@pobox.com>2011-01-13 11:34:56 -0800
commit37ee62bc6b60b566e39c8ea9fbf34b23a9a39d2f (patch)
treee696089b5bdcdcf201fe6bedbee608ad7abb9903 /Documentation/gitattributes.txt
parent4b297df9b2c0d91a8593bc026dc70553511cd09b (diff)
parentab4356111afb28568bf1ad2e909b6ecf9f83a5e6 (diff)
downloadgit-37ee62bc6b60b566e39c8ea9fbf34b23a9a39d2f.tar.gz
Merge branch 'jk/diff-driver-binary-doc'
* jk/diff-driver-binary-doc: docs: explain diff.*.binary option
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diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 22b85825ab..a282adb31e 100644
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -591,6 +591,39 @@ and now produces better output), you can remove the cache
manually with `git update-ref -d refs/notes/textconv/jpg` (where
"jpg" is the name of the diff driver, as in the example above).
+Marking files as binary
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Git usually guesses correctly whether a blob contains text or binary
+data by examining the beginning of the contents. However, sometimes you
+may want to override its decision, either because a blob contains binary
+data later in the file, or because the content, while technically
+composed of text characters, is opaque to a human reader. For example,
+many postscript files contain only ascii characters, but produce noisy
+and meaningless diffs.
+
+The simplest way to mark a file as binary is to unset the diff
+attribute in the `.gitattributes` file:
+
+------------------------
+*.ps -diff
+------------------------
+
+This will cause git to generate `Binary files differ` (or a binary
+patch, if binary patches are enabled) instead of a regular diff.
+
+However, one may also want to specify other diff driver attributes. For
+example, you might want to use `textconv` to convert postscript files to
+an ascii representation for human viewing, but otherwise treat them as
+binary files. You cannot specify both `-diff` and `diff=ps` attributes.
+The solution is to use the `diff.*.binary` config option:
+
+------------------------
+[diff "ps"]
+ textconv = ps2ascii
+ binary = true
+------------------------
+
Performing a three-way merge
~~~~~~~~~~~~~~~~~~~~~~~~~~~~