git.txt: correct stale 'GIT_EXTERNAL_DIFF' description
In fde97d8ac6 (Update documentation to remove incorrect GIT_DIFF_OPTS
example., 2006-11-27), the description of the 'GIT_EXTERNAL_DIFF'
variable was moved from 'diff-format.txt' to 'git.txt', and the
documentation was updated to remove a 'diff(1)' invocation since Git did
not use an external diff program anymore by default.
However, the description of 'GIT_EXTERNAL_DIFF' still mentions "instead
of the diff invocation described above", which is confusing.
Correct that outdated sentence.
Also, link to git(1) in 'diff-generate-patch.txt' when GIT_DIFF_OPTS and
GIT_EXTERNAL_DIFF are mentioned, so that users can easily know what
these variables are about.
Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/diff-generate-patch.txt b/Documentation/diff-generate-patch.txt
index e8ed647..b10ff4c 100644
--- a/Documentation/diff-generate-patch.txt
+++ b/Documentation/diff-generate-patch.txt
@@ -10,7 +10,8 @@
linkgit:git-diff-files[1]
with the `-p` option produces patch text.
You can customize the creation of patch text via the
-`GIT_EXTERNAL_DIFF` and the `GIT_DIFF_OPTS` environment variables.
+`GIT_EXTERNAL_DIFF` and the `GIT_DIFF_OPTS` environment variables
+(see linkgit:git[1]).
What the -p option produces is slightly different from the traditional
diff format:
diff --git a/Documentation/git.txt b/Documentation/git.txt
index 3e50065..d90a7c3 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -543,8 +543,9 @@
`GIT_EXTERNAL_DIFF`::
When the environment variable `GIT_EXTERNAL_DIFF` is set, the
- program named by it is called, instead of the diff invocation
- described above. For a path that is added, removed, or modified,
+ program named by it is called to generate diffs, and Git
+ does not use its builtin diff machinery.
+ For a path that is added, removed, or modified,
`GIT_EXTERNAL_DIFF` is called with 7 parameters:
path old-file old-hex old-mode new-file new-hex new-mode
