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unpack-trees: allow Porcelain to give different error messages

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The plumbing output is sacred as it is an API.  We _could_ change it if it
is broken in such a way that it cannot convey necessary information fully,
but we just do not _reword_ for the sake of rewording.  If somebody does
not like it, s/he is complaining too late.  S/he should have been here in
early May 2005 and make the language used by the API closer to what humans
read.  S/he wasn't here.  Too bad, and it is too late.

And people who complain should look at a bigger picture.  Look at what was
suggested by one of them and think for five seconds:

     $ git checkout mytopic
    -fatal: Entry 'frotz' not uptodate. Cannot merge.
    +fatal: Entry 'frotz' has local changes. Cannot merge.

If you do not see something wrong with this output, your brain has already
been rotten with use of git for too long a time.  Nobody asked us to
"merge" but why are we talking about "Cannot merge"?

This patch introduces a mechanism to allow Porcelains to specify messages
that are different from the ones that is given by the underlying plumbing
implementation of read-tree, so that we can reword the message Porcelains give
without disrupting the output from the plumbing.

    $ git-checkout pu
    error: You have local changes to 'Makefile'; cannot switch branches.

There are other places that ask unpack_trees() to n-way merge, detect
issues  and let it issue error message on its own, but I did this as a
demonstration and replaced only one message.

Yes I know about C99 structure initializers.  I'd love to use them but we
try to be nice to compilers without it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2008-05-17 12:03:49 -07:00
parent 377d9c409f
commit 8ccba008ee
3 changed files with 52 additions and 14 deletions
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9
unpack-trees.h
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@ -8,6 +8,14 @@ struct unpack_trees_options;
typedef int (*merge_fn_t)(struct cache_entry **src,
struct unpack_trees_options *options);
struct unpack_trees_error_msgs {
const char *would_overwrite;
const char *not_uptodate_file;
const char *not_uptodate_dir;
const char *would_lose_untracked;
const char *bind_overlap;
};
struct unpack_trees_options {
unsigned int reset:1,
merge:1,
@ -23,6 +31,7 @@ struct unpack_trees_options {
int pos;
struct dir_struct *dir;
merge_fn_t fn;
struct unpack_trees_error_msgs msgs;
int head_idx;
int merge_size;