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This patch optimizes "diff-cache -p --cached" by avoiding to inflate blobs into temporary files when the blob recorded in the cache matches the corresponding file in the work tree. The file in the work tree is passed as the comparison source in such a case instead. This optimization kicks in only when we have already read the cache this optimization and this is deliberate. Especially, diff-tree does not use this code, because changes are contained in small number of files relative to the project size most of the time, and reading cache is so expensive for a large project that the cost of reading it outweighs the savings by not inflating blobs. Also this patch cleans up the structure passed from diff clients by removing one unused structure member. Signed-off-by: Junio C Hamano <junkio@cox.net>
38 lines
982 B
C
38 lines
982 B
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#ifndef DIFF_H
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#define DIFF_H
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extern void diff_addremove(int addremove,
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unsigned mode,
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const unsigned char *sha1,
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const char *base,
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const char *path);
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extern void diff_change(unsigned mode1, unsigned mode2,
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const unsigned char *sha1,
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const unsigned char *sha2,
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const char *base, const char *path);
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extern void diff_unmerge(const char *path);
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/* These are for diff-tree-helper */
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struct diff_spec {
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unsigned char blob_sha1[20];
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unsigned short mode; /* file mode */
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unsigned sha1_valid : 1; /* if true, use blob_sha1 and trust mode;
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* however with a NULL SHA1, read them
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* from the file system.
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* if false, use the name and read mode from
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* the filesystem.
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*/
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unsigned file_valid : 1; /* if false the file does not even exist */
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};
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extern void run_external_diff(const char *name,
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struct diff_spec *, struct diff_spec *);
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#endif /* DIFF_H */
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