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builtin-add.c: restructure the code for maintainability

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The implementation of "git add" has four major codepaths that are mutually
exclusive:

 - if "--interactive" or "--patch" is given, spawn "git add--interactive"
   and exit without doing anything else.  Otherwise things are handled
   internally in this C code;

 - if "--update" is given, update the modified files and exit without
   doing anything else;

 - if "--refresh" is given, do refresh and exit without doing anything
   else;

 - otherwise, find the paths that match pathspecs and stage their
   contents.

It led to an unholy mess in the code structure; each of the latter three
codepaths has a separate call to read_cache(), even though they are all
about "read the current index, update it and write it back", and logically
they should read the index once _anyway_.

This cleans up the latter three cases by introducing a pair of helper
variables:

 - "add_new_files" is set if we need to scan the working tree for paths
   that match the pathspec.  This variable is false for "--update" and
   "--refresh", because they only work on already tracked files.

 - "require_pathspec" is set if the user must give at least one pathspec.
   "--update" does not need it but all the other cases do.

This is in preparation for introducing a new option "--all", that does the
equivalent of "git add -u && git add ." (aka "addremove").

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2008-07-19 19:22:25 -07:00
parent 09651dd86e
commit c972ec0420
1 changed files with 43 additions and 32 deletions
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75
builtin-add.c
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@ -140,8 +140,6 @@ static void refresh(int verbose, const char **pathspec)
for (specs = 0; pathspec[specs]; specs++)
/* nothing */;
seen = xcalloc(specs, 1);
if (read_cache() < 0)
die("index file corrupt");
refresh_index(&the_index, verbose ? 0 : REFRESH_QUIET, pathspec, seen);
for (i = 0; i < specs; i++) {
if (!seen[i])
@ -216,13 +214,36 @@ static int add_config(const char *var, const char *value, void *cb)
return git_default_config(var, value, cb);
}
static int add_files(struct dir_struct *dir, int flags)
{
int i, exit_status = 0;
if (dir->ignored_nr) {
fprintf(stderr, ignore_error);
for (i = 0; i < dir->ignored_nr; i++)
fprintf(stderr, "%s\n", dir->ignored[i]->name);
fprintf(stderr, "Use -f if you really want to add them.\n");
die("no files added");
}
for (i = 0; i < dir->nr; i++)
if (add_file_to_cache(dir->entries[i]->name, flags)) {
if (!ignore_add_errors)
die("adding files failed");
exit_status = 1;
}
return exit_status;
}
int cmd_add(int argc, const char **argv, const char *prefix)
{
int exit_status = 0;
int i, newfd;
int newfd;
const char **pathspec;
struct dir_struct dir;
int flags;
int add_new_files;
int require_pathspec;
argc = parse_options(argc, argv, builtin_add_options,
builtin_add_usage, 0);
@ -233,53 +254,43 @@ int cmd_add(int argc, const char **argv, const char *prefix)
git_config(add_config, NULL);
add_new_files = !take_worktree_changes && !refresh_only;
require_pathspec = !take_worktree_changes;
newfd = hold_locked_index(&lock_file, 1);
flags = ((verbose ? ADD_CACHE_VERBOSE : 0) |
(show_only ? ADD_CACHE_PRETEND : 0) |
(ignore_add_errors ? ADD_CACHE_IGNORE_ERRORS : 0));
if (take_worktree_changes) {
const char **pathspec;
if (read_cache() < 0)
die("index file corrupt");
pathspec = get_pathspec(prefix, argv);
exit_status = add_files_to_cache(prefix, pathspec, flags);
goto finish;
}
if (argc == 0) {
if (require_pathspec && argc == 0) {
fprintf(stderr, "Nothing specified, nothing added.\n");
fprintf(stderr, "Maybe you wanted to say 'git add .'?\n");
return 0;
}
pathspec = get_pathspec(prefix, argv);
/*
* If we are adding new files, we need to scan the working
* tree to find the ones that match pathspecs; this needs
* to be done before we read the index.
*/
if (add_new_files)
fill_directory(&dir, pathspec, ignored_too);
if (read_cache() < 0)
die("index file corrupt");
if (refresh_only) {
refresh(verbose, pathspec);
goto finish;
}
fill_directory(&dir, pathspec, ignored_too);
if (take_worktree_changes)
exit_status |= add_files_to_cache(prefix, pathspec, flags);
if (read_cache() < 0)
die("index file corrupt");
if (dir.ignored_nr) {
fprintf(stderr, ignore_error);
for (i = 0; i < dir.ignored_nr; i++) {
fprintf(stderr, "%s\n", dir.ignored[i]->name);
}
fprintf(stderr, "Use -f if you really want to add them.\n");
die("no files added");
}
for (i = 0; i < dir.nr; i++)
if (add_file_to_cache(dir.entries[i]->name, flags)) {
if (!ignore_add_errors)
die("adding files failed");
exit_status = 1;
}
if (add_new_files)
exit_status |= add_files(&dir, flags);
finish:
if (active_cache_changed) {