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b55e6d36eb
In git-diff, options like `-w` and `-I<regex>`, two files are considered equivalent under the specified "ignore" rules, even when they are not bit-for-bit identical. For options like `--raw`, `--name-status`, and `--name-only`, git-diff deliberately compares only the SHA values to determine whether two files are equivalent, for performance reasons. As a result, a file shown in `git diff --name-status` may not appear in `git diff --patch`. To quickly determine whether two files are equivalent, add a helper function diff_flush_patch_quietly() in diff.c. Add `.dry_run` field in `struct diff_options`. When `.dry_run` is true, builtin_diff() returns immediately upon finding any change. Call diff_flush_patch_quietly() to determine if we should flush `--raw`, `--name-only` or `--name-status` output. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Lidong Yan <yldhome2d2@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
76 lines
2.9 KiB
C
76 lines
2.9 KiB
C
#ifndef XDIFF_INTERFACE_H
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#define XDIFF_INTERFACE_H
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#include "hash.h"
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#include "xdiff/xdiff.h"
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/*
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* xdiff isn't equipped to handle content over a gigabyte;
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* we make the cutoff 1GB - 1MB to give some breathing
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* room for constant-sized additions (e.g., merge markers)
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*/
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#define MAX_XDIFF_SIZE (1024UL * 1024 * 1023)
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/**
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* The `xdiff_emit_line_fn` function can return 1 to abort early, or 0
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* to continue processing. Note that doing so is an all-or-nothing
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* affair, as returning 1 will return all the way to the top-level,
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* e.g. the xdi_diff_outf() call to generate the diff.
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*
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* Thus returning 1 means you won't be getting any more diff lines. If
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* you need something in-between those two options you'll to use
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* `xdl_emit_hunk_consume_func_t` and implement your own version of
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* xdl_emit_diff().
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*
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* We may extend the interface in the future to understand other more
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* granular return values. While you should return 1 to exit early,
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* doing so will currently make your early return indistinguishable
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* from an error internal to xdiff, xdiff itself will see that
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* non-zero return and translate it to -1.
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*
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* See "diff_grep" in diffcore-pickaxe.c and "quick_consume" in diff.c
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* for a trick to work around this, i.e. using the "consume_callback_data"
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* to note the desired early return.
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*/
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typedef int (*xdiff_emit_line_fn)(void *, char *, unsigned long);
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typedef void (*xdiff_emit_hunk_fn)(void *data,
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long old_begin, long old_nr,
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long new_begin, long new_nr,
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const char *func, long funclen);
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int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t const *xecfg, xdemitcb_t *ecb);
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int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,
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xdiff_emit_hunk_fn hunk_fn,
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xdiff_emit_line_fn line_fn,
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void *consume_callback_data,
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xpparam_t const *xpp, xdemitconf_t const *xecfg);
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int read_mmfile(mmfile_t *ptr, const char *filename);
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void read_mmblob(mmfile_t *ptr, const struct object_id *oid);
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int buffer_is_binary(const char *ptr, unsigned long size);
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void xdiff_set_find_func(xdemitconf_t *xecfg, const char *line, int cflags);
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void xdiff_clear_find_func(xdemitconf_t *xecfg);
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struct config_context;
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int parse_conflict_style_name(const char *value);
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int git_xmerge_config(const char *var, const char *value,
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const struct config_context *ctx, void *cb);
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extern int git_xmerge_style;
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/*
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* Compare the strings l1 with l2 which are of size s1 and s2 respectively.
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* Returns 1 if the strings are deemed equal, 0 otherwise.
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* The `flags` given as XDF_WHITESPACE_FLAGS determine how white spaces
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* are treated for the comparison.
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*/
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int xdiff_compare_lines(const char *l1, long s1,
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const char *l2, long s2, long flags);
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/*
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* Returns a hash of the string s of length len.
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* The `flags` given as XDF_WHITESPACE_FLAGS determine how white spaces
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* are treated for the hash.
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*/
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unsigned long xdiff_hash_string(const char *s, size_t len, long flags);
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#endif
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