git/diff-lib.c

/*
 * Copyright (C) 2005 Junio C Hamano
 */

#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"
#include "commit.h"
#include "diff.h"
#include "diffcore.h"
#include "gettext.h"
#include "hash.h"
#include "hex.h"
#include "object-name.h"
#include "read-cache.h"
#include "revision.h"
#include "cache-tree.h"
#include "unpack-trees.h"
#include "refs.h"
#include "repository.h"
#include "submodule.h"
#include "symlinks.h"
#include "trace.h"
#include "dir.h"
#include "fsmonitor.h"
#include "commit-reach.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)
{ … }

/*
 * 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,
				     const struct cache_entry *ce,
				     struct stat *st, unsigned ce_option,
				     unsigned *dirty_submodule)
{ … }

void run_diff_files(struct rev_info *revs, unsigned int option)
{ … }

/*
 * diff-index
 */

/* A file entry went away or appeared */
static void diff_index_show_file(struct rev_info *revs,
				 const char *prefix,
				 const struct cache_entry *ce,
				 const struct object_id *oid, int oid_valid,
				 unsigned int mode,
				 unsigned dirty_submodule)
{ … }

static int get_stat_data(const struct cache_entry *ce,
			 const struct object_id **oidp,
			 unsigned int *modep,
			 int cached, int match_missing,
			 unsigned *dirty_submodule, struct diff_options *diffopt)
{ … }

static void show_new_file(struct rev_info *revs,
			  const struct cache_entry *new_file,
			  int cached, int match_missing)
{ … }

static int show_modified(struct rev_info *revs,
			 const struct cache_entry *old_entry,
			 const struct cache_entry *new_entry,
			 int report_missing,
			 int cached, int match_missing)
{ … }

/*
 * 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,
			   const struct cache_entry *idx,
			   const struct cache_entry *tree)
{ … }

/*
 * 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(const struct cache_entry * const *src,
		       struct unpack_trees_options *o)
{ … }

static int diff_cache(struct rev_info *revs,
		      const struct object_id *tree_oid,
		      const char *tree_name,
		      int cached)
{ … }

void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb)
{ … }

void run_diff_index(struct rev_info *revs, unsigned int option)
{ … }

int do_diff_cache(const struct object_id *tree_oid, struct diff_options *opt)
{ … }

int index_differs_from(struct repository *r,
		       const char *def, const struct diff_flags *flags,
		       int ita_invisible_in_index)
{ … }

static const char *idiff_prefix_cb(struct diff_options *opt UNUSED, void *data)
{ … }

void show_interdiff(const struct object_id *oid1, const struct object_id *oid2,
		    int indent, struct diff_options *diffopt)
{ … }