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f0c6b2a2fd
This attempts to optimize "diff-tree -[CM] --stdin", which compares successible tree pairs. This optimization does not make much sense for other commands in the diff-* brothers. When reading from --stdin and using rename/copy detection, the patch makes diff-tree to read the current index file first. This is done to reuse the optimization used by diff-cache in the non-cached case. Similarity estimator can avoid expanding a blob if the index says what is in the work tree has an exact copy of that blob already expanded. Another optimization the patch makes is to check only file sizes first to terminate similarity estimation early. In order for this to work, it needs a way to tell the size of the blob without expanding it. Since an obvious way of doing it, which is to keep all the blobs previously used in the memory, is too costly, it does so by keeping the filesize for each object it has already seen in memory. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include "cache.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "delta.h"
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static int contains(struct diff_filespec *one,
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const char *needle, unsigned long len)
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{
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unsigned long offset, sz;
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const char *data;
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if (diff_populate_filespec(one, 0))
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return 0;
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sz = one->size;
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data = one->data;
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for (offset = 0; offset + len <= sz; offset++)
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if (!strncmp(needle, data + offset, len))
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return 1;
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return 0;
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}
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void diffcore_pickaxe(const char *needle, int opts)
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{
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struct diff_queue_struct *q = &diff_queued_diff;
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unsigned long len = strlen(needle);
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int i, has_changes;
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struct diff_queue_struct outq;
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outq.queue = NULL;
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outq.nr = outq.alloc = 0;
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if (opts & DIFF_PICKAXE_ALL) {
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/* Showing the whole changeset if needle exists */
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for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (!DIFF_FILE_VALID(p->one)) {
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if (!DIFF_FILE_VALID(p->two))
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continue; /* ignore unmerged */
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/* created */
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if (contains(p->two, needle, len))
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has_changes++;
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}
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else if (!DIFF_FILE_VALID(p->two)) {
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if (contains(p->one, needle, len))
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has_changes++;
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}
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else if (!diff_unmodified_pair(p) &&
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contains(p->one, needle, len) !=
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contains(p->two, needle, len))
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has_changes++;
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}
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if (has_changes)
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return; /* not munge the queue */
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/* otherwise we will clear the whole queue
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* by copying the empty outq at the end of this
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* function, but first clear the current entries
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* in the queue.
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*/
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for (i = 0; i < q->nr; i++)
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diff_free_filepair(q->queue[i]);
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}
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else
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/* Showing only the filepairs that has the needle */
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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has_changes = 0;
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if (!DIFF_FILE_VALID(p->one)) {
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if (!DIFF_FILE_VALID(p->two))
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; /* ignore unmerged */
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/* created */
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else if (contains(p->two, needle, len))
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has_changes = 1;
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}
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else if (!DIFF_FILE_VALID(p->two)) {
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if (contains(p->one, needle, len))
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has_changes = 1;
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}
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else if (!diff_unmodified_pair(p) &&
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contains(p->one, needle, len) !=
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contains(p->two, needle, len))
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has_changes = 1;
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if (has_changes)
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diff_q(&outq, p);
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else
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diff_free_filepair(p);
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}
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free(q->queue);
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*q = outq;
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return;
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}
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