On Sat, Apr 13, 2013 at 10:49:36PM -0700, Junio C Hamano wrote:
> Thanks. I'll queue with the following API fix-up on this, with
> obvious adjustments necessary for the later ones.
> 
>  * read_blob_data_from_index() is descriptive enough. If you read a
>    blob from the index, you would ask for it with a path; there is
>    no other sensible key to do so.
> 
>  * A function in read-cache API that works on an index should have
>    the istate as the first argument and called with name "index";
> 
>  * If callers want to operate on the default index, macro with a
>    similar name but replacing "index" with "cache" can be supplied,
>    e.g.
> 
>    #define distim_cache(x) distim_index(&the_index, x)
> ---
>  attr.c       | 2 +-
>  cache.h      | 3 ++-
>  read-cache.c | 4 +---
>  3 files changed, 4 insertions(+), 5 deletions(-)

Sounds reasonable to me -- squashing the fixed up version into my
original patch ([PATCH v2 1/1] Add public function
read_blob_data_from_index_path()) probably makes sense here :)

Thanks for reviewing and reworking!

> 
> diff --git a/attr.c b/attr.c
> index a668a63..46bde57 100644
> --- a/attr.c
> +++ b/attr.c
> @@ -387,7 +387,7 @@ static struct attr_stack *read_attr_from_index(const char 
> *path, int macro_ok)
>       char *buf, *sp;
>       int lineno = 0;
>  
> -     buf = read_blob_data_from_index_path(path, use_index);
> +     buf = read_blob_data_from_index(use_index, path);
>       if (!buf)
>               return NULL;
>  
> diff --git a/cache.h b/cache.h
> index 85ddb13..5d66c74 100644
> --- a/cache.h
> +++ b/cache.h
> @@ -307,6 +307,7 @@ extern void free_name_hash(struct index_state *istate);
>  #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
>  #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
>  #define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
> +#define read_blob_data_from_cache(path) 
> read_blob_data_from_index(&the_index, (path))
>  #endif
>  
>  enum object_type {
> @@ -452,7 +453,7 @@ extern int add_file_to_index(struct index_state *, const 
> char *path, int flags);
>  extern struct cache_entry *make_cache_entry(unsigned int mode, const 
> unsigned char *sha1, const char *path, int stage, int refresh);
>  extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
>  extern int index_name_is_other(const struct index_state *, const char *, 
> int);
> -extern void *read_blob_data_from_index_path(const char *path, struct 
> index_state *use_index);
> +extern void *read_blob_data_from_index(struct index_state *, const char *);
>  
>  /* do stat comparison even if CE_VALID is true */
>  #define CE_MATCH_IGNORE_VALID                01
> diff --git a/read-cache.c b/read-cache.c
> index cbeb248..48d87e8 100644
> --- a/read-cache.c
> +++ b/read-cache.c
> @@ -1896,14 +1896,12 @@ int index_name_is_other(const struct index_state 
> *istate, const char *name,
>       return 1;
>  }
>  
> -void *read_blob_data_from_index_path(const char *path,
> -                                  struct index_state *use_index)
> +void *read_blob_data_from_index(struct index_state *istate, const char *path)
>  {
>       int pos, len;
>       unsigned long sz;
>       enum object_type type;
>       void *data;
> -     struct index_state *istate = use_index ? use_index : &the_index;
>  
>       len = strlen(path);
>       pos = index_name_pos(istate, path, len);
> -- 
> 1.8.2.1-514-gf369d36
> 
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