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/*
* Copyright (C) 2005 Junio C Hamano
*/
#include "cache.h"
#include "quote.h"
#include "commit.h"
#include "diff.h"
#include "diffcore.h"
#include "revision.h"
#include "cache-tree.h"
#include "unpack-trees.h"
#include "refs.h"
#include "submodule.h"

/*
* diff-files
*/

/*
* Has the work tree entity been removed?
*
* Return 1 if it was removed from the work tree, 0 if an entity to be
* compared with the cache entry ce still exists (the latter includes
* the case where a directory that is not a submodule repository
* exists for ce that is a submodule -- it is a submodule that is not
* checked out). Return negative for an error.
*/
static int check_removed(const struct cache_entry *ce, struct stat *st)
{
if (lstat(ce->name, st) < 0) {
if (errno != ENOENT && errno != ENOTDIR)
return -1;
return 1;
}
if (has_symlink_leading_path(ce->name, ce_namelen(ce)))
return 1;
if (S_ISDIR(st->st_mode)) {
unsigned char sub[20];

/*
* If ce is already a gitlink, we can have a plain
* directory (i.e. the submodule is not checked out),
* or a checked out submodule. Either case this is not
* a case where something was removed from the work tree,
* so we will return 0.
*
* Otherwise, if the directory is not a submodule
* repository, that means ce which was a blob turned into
* a directory --- the blob was removed!
*/
if (!S_ISGITLINK(ce->ce_mode) &&
resolve_gitlink_ref(ce->name, "HEAD", sub))
return 1;
}
return 0;
}

/*
* Has a file changed or has a submodule new commits or a dirty work tree?
*
* Return 1 when changes are detected, 0 otherwise. If the DIRTY_SUBMODULES
* option is set, the caller does not only want to know if a submodule is
* modified at all but wants to know all the conditions that are met (new
* commits, untracked content and/or modified content).
*/
static int match_stat_with_submodule(struct diff_options *diffopt,
struct cache_entry *ce, struct stat *st,
unsigned ce_option, unsigned *dirty_submodule)
{
int changed = ce_match_stat(ce, st, ce_option);
if (S_ISGITLINK(ce->ce_mode)) {
unsigned orig_flags = diffopt->flags;
if (!DIFF_OPT_TST(diffopt, OVERRIDE_SUBMODULE_CONFIG))
set_diffopt_flags_from_submodule_config(diffopt, ce->name);
if (DIFF_OPT_TST(diffopt, IGNORE_SUBMODULES))
changed = 0;
else if (!DIFF_OPT_TST(diffopt, IGNORE_DIRTY_SUBMODULES)
&& (!changed || DIFF_OPT_TST(diffopt, DIRTY_SUBMODULES)))
*dirty_submodule = is_submodule_modified(ce->name, DIFF_OPT_TST(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES));
diffopt->flags = orig_flags;
}
return changed;
}

int run_diff_files(struct rev_info *revs, unsigned int option)
{
int entries, i;
int diff_unmerged_stage = revs->max_count;
int silent_on_removed = option & DIFF_SILENT_ON_REMOVED;
unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED)
? CE_MATCH_RACY_IS_DIRTY : 0);

diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/");

if (diff_unmerged_stage < 0)
diff_unmerged_stage = 2;
entries = active_nr;
for (i = 0; i < entries; i++) {
struct stat st;
unsigned int oldmode, newmode;
struct cache_entry *ce = active_cache[i];
int changed;
unsigned dirty_submodule = 0;

if (diff_can_quit_early(&revs->diffopt))
break;

if (!ce_path_match(ce, &revs->prune_data))
continue;

if (ce_stage(ce)) {
struct combine_diff_path *dpath;
struct diff_filepair *pair;
unsigned int wt_mode = 0;
int num_compare_stages = 0;
size_t path_len;

path_len = ce_namelen(ce);

dpath = xmalloc(combine_diff_path_size(5, path_len));
dpath->path = (char *) &(dpath->parent[5]);

dpath->next = NULL;
dpath->len = path_len;
memcpy(dpath->path, ce->name, path_len);
dpath->path[path_len] = '\0';
hashclr(dpath->sha1);
memset(&(dpath->parent[0]), 0,
sizeof(struct combine_diff_parent)*5);

changed = check_removed(ce, &st);
if (!changed)
wt_mode = ce_mode_from_stat(ce, st.st_mode);
else {
if (changed < 0) {
perror(ce->name);
continue;
}
if (silent_on_removed)
continue;
wt_mode = 0;
}
dpath->mode = wt_mode;

while (i < entries) {
struct cache_entry *nce = active_cache[i];
int stage;

if (strcmp(ce->name, nce->name))
break;

/* Stage #2 (ours) is the first parent,
* stage #3 (theirs) is the second.
*/
stage = ce_stage(nce);
if (2 <= stage) {
int mode = nce->ce_mode;
num_compare_stages++;
hashcpy(dpath->parent[stage-2].sha1, nce->sha1);
dpath->parent[stage-2].mode = ce_mode_from_stat(nce, mode);
dpath->parent[stage-2].status =
DIFF_STATUS_MODIFIED;
}

/* diff against the proper unmerged stage */
if (stage == diff_unmerged_stage)
ce = nce;
i++;
}
/*
* Compensate for loop update
*/
i--;

if (revs->combine_merges && num_compare_stages == 2) {
show_combined_diff(dpath, 2,
revs->dense_combined_merges,
revs);
free(dpath);
continue;
}
free(dpath);
dpath = NULL;

/*
* Show the diff for the 'ce' if we found the one
* from the desired stage.
*/
pair = diff_unmerge(&revs->diffopt, ce->name);
if (wt_mode)
pair->two->mode = wt_mode;
if (ce_stage(ce) != diff_unmerged_stage)
continue;
}

if (ce_uptodate(ce) || ce_skip_worktree(ce))
continue;

/* If CE_VALID is set, don't look at workdir for file removal */
changed = (ce->ce_flags & CE_VALID) ? 0 : check_removed(ce, &st);
if (changed) {
if (changed < 0) {
perror(ce->name);
continue;
}
if (silent_on_removed)
continue;
diff_addremove(&revs->diffopt, '-', ce->ce_mode,
ce->sha1, ce->name, 0);
continue;
}
changed = match_stat_with_submodule(&revs->diffopt, ce, &st,
ce_option, &dirty_submodule);
if (!changed && !dirty_submodule) {
ce_mark_uptodate(ce);
if (!DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER))
continue;
}
oldmode = ce->ce_mode;
newmode = ce_mode_from_stat(ce, st.st_mode);
diff_change(&revs->diffopt, oldmode, newmode,
ce->sha1, (changed ? null_sha1 : ce->sha1),
ce->name, 0, dirty_submodule);

}
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
return 0;
}

/*
* diff-index
*/

/* A file entry went away or appeared */
static void diff_index_show_file(struct rev_info *revs,
const char *prefix,
struct cache_entry *ce,
const unsigned char *sha1, unsigned int mode,
unsigned dirty_submodule)
{
diff_addremove(&revs->diffopt, prefix[0], mode,
sha1, ce->name, dirty_submodule);
}

static int get_stat_data(struct cache_entry *ce,
const unsigned char **sha1p,
unsigned int *modep,
int cached, int match_missing,
unsigned *dirty_submodule, struct diff_options *diffopt)
{
const unsigned char *sha1 = ce->sha1;
unsigned int mode = ce->ce_mode;

if (!cached && !ce_uptodate(ce)) {
int changed;
struct stat st;
changed = check_removed(ce, &st);
if (changed < 0)
return -1;
else if (changed) {
if (match_missing) {
*sha1p = sha1;
*modep = mode;
return 0;
}
return -1;
}
changed = match_stat_with_submodule(diffopt, ce, &st,
0, dirty_submodule);
if (changed) {
mode = ce_mode_from_stat(ce, st.st_mode);
sha1 = null_sha1;
}
}

*sha1p = sha1;
*modep = mode;
return 0;
}

static void show_new_file(struct rev_info *revs,
struct cache_entry *new,
int cached, int match_missing)
{
const unsigned char *sha1;
unsigned int mode;
unsigned dirty_submodule = 0;

/*
* New file in the index: it might actually be different in
* the working tree.
*/
if (get_stat_data(new, &sha1, &mode, cached, match_missing,
&dirty_submodule, &revs->diffopt) < 0)
return;

diff_index_show_file(revs, "+", new, sha1, mode, dirty_submodule);
}

static int show_modified(struct rev_info *revs,
struct cache_entry *old,
struct cache_entry *new,
int report_missing,
int cached, int match_missing)
{
unsigned int mode, oldmode;
const unsigned char *sha1;
unsigned dirty_submodule = 0;

if (get_stat_data(new, &sha1, &mode, cached, match_missing,
&dirty_submodule, &revs->diffopt) < 0) {
if (report_missing)
diff_index_show_file(revs, "-", old,
old->sha1, old->ce_mode, 0);
return -1;
}

if (revs->combine_merges && !cached &&
(hashcmp(sha1, old->sha1) || hashcmp(old->sha1, new->sha1))) {
struct combine_diff_path *p;
int pathlen = ce_namelen(new);

p = xmalloc(combine_diff_path_size(2, pathlen));
p->path = (char *) &p->parent[2];
p->next = NULL;
p->len = pathlen;
memcpy(p->path, new->name, pathlen);
p->path[pathlen] = 0;
p->mode = mode;
hashclr(p->sha1);
memset(p->parent, 0, 2 * sizeof(struct combine_diff_parent));
p->parent[0].status = DIFF_STATUS_MODIFIED;
p->parent[0].mode = new->ce_mode;
hashcpy(p->parent[0].sha1, new->sha1);
p->parent[1].status = DIFF_STATUS_MODIFIED;
p->parent[1].mode = old->ce_mode;
hashcpy(p->parent[1].sha1, old->sha1);
show_combined_diff(p, 2, revs->dense_combined_merges, revs);
free(p);
return 0;
}

oldmode = old->ce_mode;
if (mode == oldmode && !hashcmp(sha1, old->sha1) && !dirty_submodule &&
!DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER))
return 0;

diff_change(&revs->diffopt, oldmode, mode,
old->sha1, sha1, old->name, 0, dirty_submodule);
return 0;
}

/*
* This gets a mix of an existing index and a tree, one pathname entry
* at a time. The index entry may be a single stage-0 one, but it could
* also be multiple unmerged entries (in which case idx_pos/idx_nr will
* give you the position and number of entries in the index).
*/
static void do_oneway_diff(struct unpack_trees_options *o,
struct cache_entry *idx,
struct cache_entry *tree)
{
struct rev_info *revs = o->unpack_data;
int match_missing, cached;

/* if the entry is not checked out, don't examine work tree */
cached = o->index_only ||
(idx && ((idx->ce_flags & CE_VALID) || ce_skip_worktree(idx)));
/*
* Backward compatibility wart - "diff-index -m" does
* not mean "do not ignore merges", but "match_missing".
*
* But with the revision flag parsing, that's found in
* "!revs->ignore_merges".
*/
match_missing = !revs->ignore_merges;

if (cached && idx && ce_stage(idx)) {
struct diff_filepair *pair;
pair = diff_unmerge(&revs->diffopt, idx->name);
if (tree)
fill_filespec(pair->one, tree->sha1, tree->ce_mode);
return;
}

/*
* Something added to the tree?
*/
if (!tree) {
show_new_file(revs, idx, cached, match_missing);
return;
}

/*
* Something removed from the tree?
*/
if (!idx) {
diff_index_show_file(revs, "-", tree, tree->sha1, tree->ce_mode, 0);
return;
}

/* Show difference between old and new */
show_modified(revs, tree, idx, 1, cached, match_missing);
}

/*
* The unpack_trees() interface is designed for merging, so
* the different source entries are designed primarily for
* the source trees, with the old index being really mainly
* used for being replaced by the result.
*
* For diffing, the index is more important, and we only have a
* single tree.
*
* We're supposed to advance o->pos to skip what we have already processed.
*
* This wrapper makes it all more readable, and takes care of all
* the fairly complex unpack_trees() semantic requirements, including
* the skipping, the path matching, the type conflict cases etc.
*/
static int oneway_diff(struct cache_entry **src, struct unpack_trees_options *o)
{
struct cache_entry *idx = src[0];
struct cache_entry *tree = src[1];
struct rev_info *revs = o->unpack_data;

/*
* Unpack-trees generates a DF/conflict entry if
* there was a directory in the index and a tree
* in the tree. From a diff standpoint, that's a
* delete of the tree and a create of the file.
*/
if (tree == o->df_conflict_entry)
tree = NULL;

if (ce_path_match(idx ? idx : tree, &revs->prune_data)) {
do_oneway_diff(o, idx, tree);
if (diff_can_quit_early(&revs->diffopt)) {
o->exiting_early = 1;
return -1;
}
}

return 0;
}

static int diff_cache(struct rev_info *revs,
const unsigned char *tree_sha1,
const char *tree_name,
int cached)
{
struct tree *tree;
struct tree_desc t;
struct unpack_trees_options opts;

tree = parse_tree_indirect(tree_sha1);
if (!tree)
return error("bad tree object %s",
tree_name ? tree_name : sha1_to_hex(tree_sha1));
memset(&opts, 0, sizeof(opts));
opts.head_idx = 1;
opts.index_only = cached;
opts.diff_index_cached = (cached &&
!DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER));
opts.merge = 1;
opts.fn = oneway_diff;
opts.unpack_data = revs;
opts.src_index = &the_index;
opts.dst_index = NULL;
opts.pathspec = &revs->diffopt.pathspec;
opts.pathspec->recursive = 1;
opts.pathspec->max_depth = -1;

init_tree_desc(&t, tree->buffer, tree->size);
return unpack_trees(1, &t, &opts);
}

int run_diff_index(struct rev_info *revs, int cached)
{
struct object_array_entry *ent;

ent = revs->pending.objects;
if (diff_cache(revs, ent->item->sha1, ent->name, cached))
exit(128);

diff_set_mnemonic_prefix(&revs->diffopt, "c/", cached ? "i/" : "w/");
diffcore_fix_diff_index(&revs->diffopt);
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
return 0;
}

int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
{
struct rev_info revs;

init_revisions(&revs, NULL);
init_pathspec(&revs.prune_data, opt->pathspec.raw);
revs.diffopt = *opt;

if (diff_cache(&revs, tree_sha1, NULL, 1))
exit(128);
return 0;
}

int index_differs_from(const char *def, int diff_flags)
{
struct rev_info rev;
struct setup_revision_opt opt;

init_revisions(&rev, NULL);
memset(&opt, 0, sizeof(opt));
opt.def = def;
setup_revisions(0, NULL, &rev, &opt);
DIFF_OPT_SET(&rev.diffopt, QUICK);
DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
rev.diffopt.flags |= diff_flags;
run_diff_index(&rev, 1);
if (rev.pending.alloc)
free(rev.pending.objects);
return (DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES) != 0);
}
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