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git-commit-vandalism/diff.h
Elijah Newren a64215b6cd object.h: stop depending on cache.h; make cache.h depend on object.h 
Things should be able to depend on object.h without pulling in all of
cache.h.  Move an enum to allow this.

Note that a couple files previously depended on things brought in
through cache.h indirectly (revision.h -> commit.h -> object.h ->
cache.h).  As such, this change requires making existing dependencies
more explicit in half a dozen files.  The inclusion of strbuf.h in
some headers if of particular note: these headers directly embedded a
strbuf in some new structs, meaning they should have been including
strbuf.h all along but were indirectly getting the necessary
definitions.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-02-23 17:25:29 -08:00

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/*
* Copyright (C) 2005 Junio C Hamano
*/
#ifndef DIFF_H
#define DIFF_H
#include "tree-walk.h"
#include "pathspec.h"
#include "object.h"
#include "oidset.h"
#include "strbuf.h"
/**
* The diff API is for programs that compare two sets of files (e.g. two trees,
* one tree and the index) and present the found difference in various ways.
* The calling program is responsible for feeding the API pairs of files, one
* from the "old" set and the corresponding one from "new" set, that are
* different.
* The library called through this API is called diffcore, and is responsible
* for two things.
*
* - finding total rewrites (`-B`), renames (`-M`) and copies (`-C`), and
* changes that touch a string (`-S`), as specified by the caller.
*
* - outputting the differences in various formats, as specified by the caller.
*
* Calling sequence
* ----------------
*
* - Prepare `struct diff_options` to record the set of diff options, and then
* call `repo_diff_setup()` to initialize this structure. This sets up the
* vanilla default.
*
* - Fill in the options structure to specify desired output format, rename
* detection, etc. `diff_opt_parse()` can be used to parse options given
* from the command line in a way consistent with existing git-diff family
* of programs.
*
* - Call `diff_setup_done()`; this inspects the options set up so far for
* internal consistency and make necessary tweaking to it (e.g. if textual
* patch output was asked, recursive behaviour is turned on); the callback
* set_default in diff_options can be used to tweak this more.
*
* - As you find different pairs of files, call `diff_change()` to feed
* modified files, `diff_addremove()` to feed created or deleted files, or
* `diff_unmerge()` to feed a file whose state is 'unmerged' to the API.
* These are thin wrappers to a lower-level `diff_queue()` function that is
* flexible enough to record any of these kinds of changes.
*
* - Once you finish feeding the pairs of files, call `diffcore_std()`.
* This will tell the diffcore library to go ahead and do its work.
*
* - Calling `diff_flush()` will produce the output, it will call
* `diff_free()` to free any resources, e.g. those allocated in
* `diff_opt_parse()`.
*
* - Set `.no_free = 1` before calling `diff_flush()` to defer the
* freeing of allocated memory in diff_options. This is useful when
* `diff_flush()` is being called in a loop, rather than as a
* one-off. When setting `.no_free = 1` you must ensure that
* `diff_free()` is called at the end, either by flipping the flag
* before the last `diff_flush()` call, or by flipping it before
* calling `diff_free()` yourself.
*/
struct combine_diff_path;
struct commit;
struct diff_filespec;
struct diff_options;
struct diff_queue_struct;
struct oid_array;
struct option;
struct repository;
struct rev_info;
struct userdiff_driver;
typedef int (*pathchange_fn_t)(struct diff_options *options,
struct combine_diff_path *path);
typedef void (*change_fn_t)(struct diff_options *options,
unsigned old_mode, unsigned new_mode,
const struct object_id *old_oid,
const struct object_id *new_oid,
int old_oid_valid, int new_oid_valid,
const char *fullpath,
unsigned old_dirty_submodule, unsigned new_dirty_submodule);
typedef void (*add_remove_fn_t)(struct diff_options *options,
int addremove, unsigned mode,
const struct object_id *oid,
int oid_valid,
const char *fullpath, unsigned dirty_submodule);
typedef void (*diff_format_fn_t)(struct diff_queue_struct *q,
struct diff_options *options, void *data);
typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data);
#define DIFF_FORMAT_RAW 0x0001
#define DIFF_FORMAT_DIFFSTAT 0x0002
#define DIFF_FORMAT_NUMSTAT 0x0004
#define DIFF_FORMAT_SUMMARY 0x0008
#define DIFF_FORMAT_PATCH 0x0010
#define DIFF_FORMAT_SHORTSTAT 0x0020
#define DIFF_FORMAT_DIRSTAT 0x0040
/* These override all above */
#define DIFF_FORMAT_NAME 0x0100
#define DIFF_FORMAT_NAME_STATUS 0x0200
#define DIFF_FORMAT_CHECKDIFF 0x0400
/* Same as output_format = 0 but we know that -s flag was given
* and we should not give default value to output_format.
*/
#define DIFF_FORMAT_NO_OUTPUT 0x0800
#define DIFF_FORMAT_CALLBACK 0x1000
#define DIFF_FLAGS_INIT { 0 }
struct diff_flags {
/**
* Tells if tree traversal done by tree-diff should recursively descend
* into a tree object pair that are different in preimage and postimage set.
*/
unsigned recursive;
unsigned tree_in_recursive;
/* Affects the way how a file that is seemingly binary is treated. */
unsigned binary;
unsigned text;
/**
* Tells the patch output format not to use abbreviated object names on the
* "index" lines.
*/
unsigned full_index;
/* Affects if diff-files shows removed files. */
unsigned silent_on_remove;
/**
* Tells the diffcore library that the caller is feeding unchanged
* filepairs to allow copies from unmodified files be detected.
*/
unsigned find_copies_harder;
unsigned follow_renames;
unsigned rename_empty;
/* Internal; used for optimization to see if there is any change. */
unsigned has_changes;
unsigned quick;
/**
* Tells diff-files that the input is not tracked files but files in random
* locations on the filesystem.
*/
unsigned no_index;
/**
* Tells output routine that it is Ok to call user specified patch output
* routine. Plumbing disables this to ensure stable output.
*/
unsigned allow_external;
/**
* For communication between the calling program and the options parser;
* tell the calling program to signal the presence of difference using
* program exit code.
*/
unsigned exit_with_status;
/**
* Tells the library that the calling program is feeding the filepairs
* reversed; `one` is two, and `two` is one.
*/
unsigned reverse_diff;
unsigned check_failed;
unsigned relative_name;
unsigned ignore_submodules;
unsigned dirstat_cumulative;
unsigned dirstat_by_file;
unsigned allow_textconv;
unsigned textconv_set_via_cmdline;
unsigned diff_from_contents;
unsigned dirty_submodules;
unsigned ignore_untracked_in_submodules;
unsigned ignore_submodule_set;
unsigned ignore_dirty_submodules;
unsigned override_submodule_config;
unsigned dirstat_by_line;
unsigned funccontext;
unsigned default_follow_renames;
unsigned stat_with_summary;
unsigned suppress_diff_headers;
unsigned dual_color_diffed_diffs;
unsigned suppress_hunk_header_line_count;
};
static inline void diff_flags_or(struct diff_flags *a,
const struct diff_flags *b)
{
char *tmp_a = (char *)a;
const char *tmp_b = (const char *)b;
int i;
for (i = 0; i < sizeof(struct diff_flags); i++)
tmp_a[i] |= tmp_b[i];
}
#define DIFF_XDL_TST(opts, flag) ((opts)->xdl_opts & XDF_##flag)
#define DIFF_XDL_SET(opts, flag) ((opts)->xdl_opts |= XDF_##flag)
#define DIFF_XDL_CLR(opts, flag) ((opts)->xdl_opts &= ~XDF_##flag)
#define DIFF_WITH_ALG(opts, flag) (((opts)->xdl_opts & ~XDF_DIFF_ALGORITHM_MASK) | XDF_##flag)
enum diff_words_type {
DIFF_WORDS_NONE = 0,
DIFF_WORDS_PORCELAIN,
DIFF_WORDS_PLAIN,
DIFF_WORDS_COLOR
};
enum diff_submodule_format {
DIFF_SUBMODULE_SHORT = 0,
DIFF_SUBMODULE_LOG,
DIFF_SUBMODULE_INLINE_DIFF
};
/**
* the set of options the calling program wants to affect the operation of
* diffcore library with.
*/
struct diff_options {
const char *orderfile;
/*
* "--rotate-to=<file>" would start showing at <file> and when
* the output reaches the end, wrap around by default.
* Setting skip_instead_of_rotate to true stops the output at the
* end, effectively discarding the earlier part of the output
* before <file>'s diff (this is used to implement the
* "--skip-to=<file>" option).
*
* When rotate_to_strict is set, it is an error if there is no
* <file> in the diff. Otherwise, the output starts at the
* path that is the same as, or first path that sorts after,
* <file>. Because it is unreasonable to require the exact
* match for "git log -p --rotate-to=<file>" (i.e. not all
* commit would touch that single <file>), "git log" sets it
* to false. "git diff" sets it to true to detect an error
* in the command line option.
*/
const char *rotate_to;
int skip_instead_of_rotate;
int rotate_to_strict;
/**
* A constant string (can and typically does contain newlines to look for
* a block of text, not just a single line) to filter out the filepairs
* that do not change the number of strings contained in its preimage and
* postimage of the diff_queue.
*/
const char *pickaxe;
unsigned pickaxe_opts;
/* -I<regex> */
regex_t **ignore_regex;
size_t ignore_regex_nr, ignore_regex_alloc;
const char *single_follow;
const char *a_prefix, *b_prefix;
const char *line_prefix;
size_t line_prefix_length;
/**
* collection of boolean options that affects the operation, but some do
* not have anything to do with the diffcore library.
*/
struct diff_flags flags;
/* diff-filter bits */
unsigned int filter, filter_not;
int use_color;
/* Number of context lines to generate in patch output. */
int context;
int interhunkcontext;
/* Affects the way detection logic for complete rewrites, renames and
* copies.
*/
int break_opt;
int detect_rename;
int irreversible_delete;
int skip_stat_unmatch;
int line_termination;
/* The output format used when `diff_flush()` is run. */
int output_format;
/* Affects the way detection logic for complete rewrites, renames and
* copies.
*/
int rename_score;
int rename_limit;
int needed_rename_limit;
int degraded_cc_to_c;
int show_rename_progress;
int dirstat_permille;
int setup;
/* Number of hexdigits to abbreviate raw format output to. */
int abbrev;
/* If non-zero, then stop computing after this many changes. */
int max_changes;
int ita_invisible_in_index;
/* white-space error highlighting */
#define WSEH_NEW (1<<12)
#define WSEH_CONTEXT (1<<13)
#define WSEH_OLD (1<<14)
unsigned ws_error_highlight;
const char *prefix;
int prefix_length;
const char *stat_sep;
int xdl_opts;
/* see Documentation/diff-options.txt */
char **anchors;
size_t anchors_nr, anchors_alloc;
int stat_width;
int stat_name_width;
int stat_graph_width;
int stat_count;
const char *word_regex;
enum diff_words_type word_diff;
enum diff_submodule_format submodule_format;
struct oidset *objfind;
/* this is set by diffcore for DIFF_FORMAT_PATCH */
int found_changes;
/* to support internal diff recursion by --follow hack*/
int found_follow;
/* Callback which allows tweaking the options in diff_setup_done(). */
void (*set_default)(struct diff_options *);
FILE *file;
int close_file;
#define OUTPUT_INDICATOR_NEW 0
#define OUTPUT_INDICATOR_OLD 1
#define OUTPUT_INDICATOR_CONTEXT 2
char output_indicators[3];
struct pathspec pathspec;
pathchange_fn_t pathchange;
change_fn_t change;
add_remove_fn_t add_remove;
void *change_fn_data;
diff_format_fn_t format_callback;
void *format_callback_data;
diff_prefix_fn_t output_prefix;
void *output_prefix_data;
int diff_path_counter;
struct emitted_diff_symbols *emitted_symbols;
enum {
COLOR_MOVED_NO = 0,
COLOR_MOVED_PLAIN = 1,
COLOR_MOVED_BLOCKS = 2,
COLOR_MOVED_ZEBRA = 3,
COLOR_MOVED_ZEBRA_DIM = 4,
} color_moved;
#define COLOR_MOVED_DEFAULT COLOR_MOVED_ZEBRA
#define COLOR_MOVED_MIN_ALNUM_COUNT 20
/* XDF_WHITESPACE_FLAGS regarding block detection are set at 2, 3, 4 */
#define COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE (1<<5)
#define COLOR_MOVED_WS_ERROR (1<<0)
unsigned color_moved_ws_handling;
struct repository *repo;
struct strmap *additional_path_headers;
int no_free;
};
unsigned diff_filter_bit(char status);
void diff_emit_submodule_del(struct diff_options *o, const char *line);
void diff_emit_submodule_add(struct diff_options *o, const char *line);
void diff_emit_submodule_untracked(struct diff_options *o, const char *path);
void diff_emit_submodule_modified(struct diff_options *o, const char *path);
void diff_emit_submodule_header(struct diff_options *o, const char *header);
void diff_emit_submodule_error(struct diff_options *o, const char *err);
void diff_emit_submodule_pipethrough(struct diff_options *o,
const char *line, int len);
struct diffstat_t {
int nr;
int alloc;
struct diffstat_file {
char *from_name;
char *name;
char *print_name;
const char *comments;
unsigned is_unmerged:1;
unsigned is_binary:1;
unsigned is_renamed:1;
unsigned is_interesting:1;
uintmax_t added, deleted;
} **files;
};
enum color_diff {
DIFF_RESET = 0,
DIFF_CONTEXT = 1,
DIFF_METAINFO = 2,
DIFF_FRAGINFO = 3,
DIFF_FILE_OLD = 4,
DIFF_FILE_NEW = 5,
DIFF_COMMIT = 6,
DIFF_WHITESPACE = 7,
DIFF_FUNCINFO = 8,
DIFF_FILE_OLD_MOVED = 9,
DIFF_FILE_OLD_MOVED_ALT = 10,
DIFF_FILE_OLD_MOVED_DIM = 11,
DIFF_FILE_OLD_MOVED_ALT_DIM = 12,
DIFF_FILE_NEW_MOVED = 13,
DIFF_FILE_NEW_MOVED_ALT = 14,
DIFF_FILE_NEW_MOVED_DIM = 15,
DIFF_FILE_NEW_MOVED_ALT_DIM = 16,
DIFF_CONTEXT_DIM = 17,
DIFF_FILE_OLD_DIM = 18,
DIFF_FILE_NEW_DIM = 19,
DIFF_CONTEXT_BOLD = 20,
DIFF_FILE_OLD_BOLD = 21,
DIFF_FILE_NEW_BOLD = 22,
};
const char *diff_get_color(int diff_use_color, enum color_diff ix);
#define diff_get_color_opt(o, ix) \
diff_get_color((o)->use_color, ix)
const char *diff_line_prefix(struct diff_options *);
extern const char mime_boundary_leader[];
struct combine_diff_path *diff_tree_paths(
struct combine_diff_path *p, const struct object_id *oid,
const struct object_id **parents_oid, int nparent,
struct strbuf *base, struct diff_options *opt);
void diff_tree_oid(const struct object_id *old_oid,
const struct object_id *new_oid,
const char *base, struct diff_options *opt);
void diff_root_tree_oid(const struct object_id *new_oid, const char *base,
struct diff_options *opt);
struct combine_diff_path {
struct combine_diff_path *next;
char *path;
unsigned int mode;
struct object_id oid;
struct combine_diff_parent {
char status;
unsigned int mode;
struct object_id oid;
struct strbuf path;
} parent[FLEX_ARRAY];
};
#define combine_diff_path_size(n, l) \
st_add4(sizeof(struct combine_diff_path), (l), 1, \
st_mult(sizeof(struct combine_diff_parent), (n)))
void show_combined_diff(struct combine_diff_path *elem, int num_parent,
struct rev_info *);
void diff_tree_combined(const struct object_id *oid, const struct oid_array *parents, struct rev_info *rev);
void diff_tree_combined_merge(const struct commit *commit, struct rev_info *rev);
void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b);
int diff_can_quit_early(struct diff_options *);
void diff_addremove(struct diff_options *,
int addremove,
unsigned mode,
const struct object_id *oid,
int oid_valid,
const char *fullpath, unsigned dirty_submodule);
void diff_change(struct diff_options *,
unsigned mode1, unsigned mode2,
const struct object_id *old_oid,
const struct object_id *new_oid,
int old_oid_valid, int new_oid_valid,
const char *fullpath,
unsigned dirty_submodule1, unsigned dirty_submodule2);
struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);
void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat,
struct diff_queue_struct *q);
void free_diffstat_info(struct diffstat_t *diffstat);
#define DIFF_SETUP_REVERSE 1
#define DIFF_SETUP_USE_SIZE_CACHE 4
/*
* Poor man's alternative to parse-option, to allow both stuck form
* (--option=value) and separate form (--option value).
*/
int parse_long_opt(const char *opt, const char **argv,
const char **optarg);
int git_diff_basic_config(const char *var, const char *value, void *cb);
int git_diff_heuristic_config(const char *var, const char *value, void *cb);
void init_diff_ui_defaults(void);
int git_diff_ui_config(const char *var, const char *value, void *cb);
#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
#define diff_setup(diffopts) repo_diff_setup(the_repository, diffopts)
#endif
void repo_diff_setup(struct repository *, struct diff_options *);
struct option *add_diff_options(const struct option *, struct diff_options *);
int diff_opt_parse(struct diff_options *, const char **, int, const char *);
void diff_setup_done(struct diff_options *);
int git_config_rename(const char *var, const char *value);
#define DIFF_DETECT_RENAME 1
#define DIFF_DETECT_COPY 2
#define DIFF_PICKAXE_ALL 1
#define DIFF_PICKAXE_REGEX 2
#define DIFF_PICKAXE_KIND_S 4 /* traditional plumbing counter */
#define DIFF_PICKAXE_KIND_G 8 /* grep in the patch */
#define DIFF_PICKAXE_KIND_OBJFIND 16 /* specific object IDs */
#define DIFF_PICKAXE_KINDS_MASK (DIFF_PICKAXE_KIND_S | \
DIFF_PICKAXE_KIND_G | \
DIFF_PICKAXE_KIND_OBJFIND)
#define DIFF_PICKAXE_KINDS_G_REGEX_MASK (DIFF_PICKAXE_KIND_G | \
DIFF_PICKAXE_REGEX)
#define DIFF_PICKAXE_KINDS_ALL_OBJFIND_MASK (DIFF_PICKAXE_ALL | \
DIFF_PICKAXE_KIND_OBJFIND)
#define DIFF_PICKAXE_IGNORE_CASE 32
void diffcore_std(struct diff_options *);
void diffcore_fix_diff_index(void);
#define COMMON_DIFF_OPTIONS_HELP \
"\ncommon diff options:\n" \
" -z output diff-raw with lines terminated with NUL.\n" \
" -p output patch format.\n" \
" -u synonym for -p.\n" \
" --patch-with-raw\n" \
" output both a patch and the diff-raw format.\n" \
" --stat show diffstat instead of patch.\n" \
" --numstat show numeric diffstat instead of patch.\n" \
" --patch-with-stat\n" \
" output a patch and prepend its diffstat.\n" \
" --name-only show only names of changed files.\n" \
" --name-status show names and status of changed files.\n" \
" --full-index show full object name on index lines.\n" \
" --abbrev=<n> abbreviate object names in diff-tree header and diff-raw.\n" \
" -R swap input file pairs.\n" \
" -B detect complete rewrites.\n" \
" -M detect renames.\n" \
" -C detect copies.\n" \
" --find-copies-harder\n" \
" try unchanged files as candidate for copy detection.\n" \
" -l<n> limit rename attempts up to <n> paths.\n" \
" -O<file> reorder diffs according to the <file>.\n" \
" -S<string> find filepair whose only one side contains the string.\n" \
" --pickaxe-all\n" \
" show all files diff when -S is used and hit is found.\n" \
" -a --text treat all files as text.\n"
int diff_queue_is_empty(struct diff_options *o);
void diff_flush(struct diff_options*);
void diff_free(struct diff_options*);
void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc);
/* diff-raw status letters */
#define DIFF_STATUS_ADDED 'A'
#define DIFF_STATUS_COPIED 'C'
#define DIFF_STATUS_DELETED 'D'
#define DIFF_STATUS_MODIFIED 'M'
#define DIFF_STATUS_RENAMED 'R'
#define DIFF_STATUS_TYPE_CHANGED 'T'
#define DIFF_STATUS_UNKNOWN 'X'
#define DIFF_STATUS_UNMERGED 'U'
/* these are not diff-raw status letters proper, but used by
* diffcore-filter insn to specify additional restrictions.
*/
#define DIFF_STATUS_FILTER_AON '*'
#define DIFF_STATUS_FILTER_BROKEN 'B'
/*
* This is different from find_unique_abbrev() in that
* it stuffs the result with dots for alignment.
*/
const char *diff_aligned_abbrev(const struct object_id *sha1, int);
void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb);
/* do not report anything on removed paths */
#define DIFF_SILENT_ON_REMOVED 01
/* report racily-clean paths as modified */
#define DIFF_RACY_IS_MODIFIED 02
int run_diff_files(struct rev_info *revs, unsigned int option);
#define DIFF_INDEX_CACHED 01
#define DIFF_INDEX_MERGE_BASE 02
int run_diff_index(struct rev_info *revs, unsigned int option);
int do_diff_cache(const struct object_id *, struct diff_options *);
int diff_flush_patch_id(struct diff_options *, struct object_id *, int);
void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx);
int diff_result_code(struct diff_options *, int);
int diff_no_index(struct rev_info *,
int implicit_no_index, int, const char **);
int index_differs_from(struct repository *r, const char *def,
const struct diff_flags *flags,
int ita_invisible_in_index);
/*
* Emit an interdiff of two object ID's to 'diff_options.file' optionally
* indented by 'indent' spaces.
*/
void show_interdiff(const struct object_id *, const struct object_id *,
int indent, struct diff_options *);
/*
* Fill the contents of the filespec "df", respecting any textconv defined by
* its userdiff driver. The "driver" parameter must come from a
* previous call to get_textconv(), and therefore should either be NULL or have
* textconv enabled.
*
* Note that the memory ownership of the resulting buffer depends on whether
* the driver field is NULL. If it is, then the memory belongs to the filespec
* struct. If it is non-NULL, then "outbuf" points to a newly allocated buffer
* that should be freed by the caller.
*/
size_t fill_textconv(struct repository *r,
struct userdiff_driver *driver,
struct diff_filespec *df,
char **outbuf);
/*
* Look up the userdiff driver for the given filespec, and return it if
* and only if it has textconv enabled (otherwise return NULL). The result
* can be passed to fill_textconv().
*/
struct userdiff_driver *get_textconv(struct repository *r,
struct diff_filespec *one);
/*
* Prepare diff_filespec and convert it using diff textconv API
* if the textconv driver exists.
* Return 1 if the conversion succeeds, 0 otherwise.
*/
int textconv_object(struct repository *repo,
const char *path,
unsigned mode,
const struct object_id *oid, int oid_valid,
char **buf, unsigned long *buf_size);
int parse_rename_score(const char **cp_p);
long parse_algorithm_value(const char *value);
void print_stat_summary(FILE *fp, int files,
int insertions, int deletions);
void setup_diff_pager(struct diff_options *);
#endif /* DIFF_H */
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