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(git) diff output relative path?

I need to get some diffs in my repo that are not relative to the base of the repo, but instead relative to a given base or given path.

By default I get:

git diff
diff --git a/path/to/file b/path/to/file
index 0cc125e..9bf911e 100644
--- a/path/to/file
+++ b/path/to/file

But what I want is something like:

git diff --prefix=/new/path/to
diff --git a/new/path/to/file b/new/path/to/file
index 0cc125e..9bf911e 100644
--- a/new/path/to/file
+++ b/new/path/to/file

I have looked over the --relative option (not what I am looking for), the --src/dst-prefix (these can only change the "a" or "b" parts. Am I missing something basic?

Solution

  • Seems like --src-prefix and --dst-prefix are what you're asking for:

    $ cd .../git/builtin
$ ed - var.c << end
> 0a
> xxx
> .
> wq
> end
$ git diff
diff --git a/builtin/var.c b/builtin/var.c
index aedbb53..5210013 100644
--- a/builtin/var.c
+++ b/builtin/var.c
@@ -1,3 +1,4 @@
+xxx
 /*
  * GIT - The information manager from hell
  *

    (so far, pretty standard; now:)

    $ git diff --src-prefix=a/new/ --dst-prefix=b/new/
diff --git a/new/builtin/var.c b/new/builtin/var.c
index aedbb53..5210013 100644
--- a/new/builtin/var.c
+++ b/new/builtin/var.c
@@ -1,3 +1,4 @@
+xxx
 /*
  * GIT - The information manager from hell
  *

    You can combine this with --relative:

    $ git diff --relative --src-prefix=a/new/ --dst-prefix=b/new/
diff --git a/new/var.c b/new/var.c
index aedbb53..5210013 100644
--- a/new/var.c
+++ b/new/var.c
@@ -1,3 +1,4 @@
+xxx
 /*
  * GIT - The information manager from hell
  *
$