--------
[verse]
'git-checkout-index' [-u] [-q] [-a] [-f] [-n] [--prefix=<string>]
- [--stage=<number>] [--] <file>...
+ [--stage=<number>]
+ [-z] [--stdin]
+ [--] [<file>]\*
DESCRIPTION
-----------
Instead of checking out unmerged entries, copy out the
files from named stage. <number> must be between 1 and 3.
+--stdin::
+ Instead of taking list of paths from the command line,
+ read list of paths from the standard input. Paths are
+ separated by LF (i.e. one path per line) by default.
+
+-z::
+ Only meaningful with `--stdin`; paths are separated with
+ NUL character instead of LF.
+
--::
Do not interpret any more arguments as options.
which will force all existing `*.h` files to be replaced with their
cached copies. If an empty command line implied "all", then this would
-force-refresh everything in the index, which was not the point.
+force-refresh everything in the index, which was not the point. But
+since git-checkout-index accepts --stdin it would be faster to use:
+
+----------------
+$ find . -name '*.h' -print0 | git-checkout-index -f -z --stdin
+----------------
The `--` is just a good idea when you know the rest will be filenames;
it will prevent problems with a filename of, for example, `-a`.
LIB_FILE=libgit.a
LIB_H = \
- blob.h cache.h commit.h count-delta.h csum-file.h delta.h \
+ blob.h cache.h commit.h csum-file.h delta.h \
diff.h object.h pack.h pkt-line.h quote.h refs.h \
run-command.h strbuf.h tag.h tree.h git-compat-util.h revision.h
diffcore-delta.o
LIB_OBJS = \
- blob.o commit.o connect.o count-delta.o csum-file.o \
+ blob.o commit.o connect.o csum-file.o \
date.o diff-delta.o entry.o exec_cmd.o ident.o index.o \
object.o pack-check.o patch-delta.o path.o pkt-line.o \
quote.o read-cache.o refs.o run-command.o \
*
* find . -name '*.h' -print0 | xargs -0 git-checkout-index -f --
*
+ * or:
+ *
+ * find . -name '*.h' -print0 | git-checkout-index -f -z --stdin
+ *
* which will force all existing *.h files to be replaced with
* their cached copies. If an empty command line implied "all",
* then this would force-refresh everything in the cache, which
* but get used to it in scripting!).
*/
#include "cache.h"
+#include "strbuf.h"
+#include "quote.h"
static const char *prefix;
static int prefix_length;
int i;
int newfd = -1;
int all = 0;
+ int read_from_stdin = 0;
+ int line_termination = '\n';
prefix = setup_git_directory();
git_config(git_default_config);
die("cannot open index.lock file.");
continue;
}
+ if (!strcmp(arg, "-z")) {
+ line_termination = 0;
+ continue;
+ }
+ if (!strcmp(arg, "--stdin")) {
+ if (i != argc - 1)
+ die("--stdin must be at the end");
+ read_from_stdin = 1;
+ i++; /* do not consider arg as a file name */
+ break;
+ }
if (!strncmp(arg, "--prefix=", 9)) {
state.base_dir = arg+9;
state.base_dir_len = strlen(state.base_dir);
if (all)
die("git-checkout-index: don't mix '--all' and explicit filenames");
+ if (read_from_stdin)
+ die("git-checkout-index: don't mix '--stdin' and explicit filenames");
checkout_file(prefix_path(prefix, prefix_length, arg));
}
+ if (read_from_stdin) {
+ struct strbuf buf;
+ if (all)
+ die("git-checkout-index: don't mix '--all' and '--stdin'");
+ strbuf_init(&buf);
+ while (1) {
+ char *path_name;
+ read_line(&buf, stdin, line_termination);
+ if (buf.eof)
+ break;
+ if (line_termination && buf.buf[0] == '"')
+ path_name = unquote_c_style(buf.buf, NULL);
+ else
+ path_name = buf.buf;
+ checkout_file(prefix_path(prefix, prefix_length, path_name));
+ if (path_name != buf.buf)
+ free(path_name);
+ }
+ }
+
if (all)
checkout_all();
+++ /dev/null
-/*
- * Copyright (C) 2005 Junio C Hamano
- * The delta-parsing part is almost straight copy of patch-delta.c
- * which is (C) 2005 Nicolas Pitre <nico@cam.org>.
- */
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-#include "delta.h"
-#include "count-delta.h"
-
-/*
- * NOTE. We do not _interpret_ delta fully. As an approximation, we
- * just count the number of bytes that are copied from the source, and
- * the number of literal data bytes that are inserted.
- *
- * Number of bytes that are _not_ copied from the source is deletion,
- * and number of inserted literal bytes are addition, so sum of them
- * is the extent of damage.
- */
-int count_delta(void *delta_buf, unsigned long delta_size,
- unsigned long *src_copied, unsigned long *literal_added)
-{
- unsigned long copied_from_source, added_literal;
- const unsigned char *data, *top;
- unsigned char cmd;
- unsigned long src_size, dst_size, out;
-
- if (delta_size < DELTA_SIZE_MIN)
- return -1;
-
- data = delta_buf;
- top = delta_buf + delta_size;
-
- src_size = get_delta_hdr_size(&data);
- dst_size = get_delta_hdr_size(&data);
-
- added_literal = copied_from_source = out = 0;
- while (data < top) {
- cmd = *data++;
- if (cmd & 0x80) {
- unsigned long cp_off = 0, cp_size = 0;
- if (cmd & 0x01) cp_off = *data++;
- if (cmd & 0x02) cp_off |= (*data++ << 8);
- if (cmd & 0x04) cp_off |= (*data++ << 16);
- if (cmd & 0x08) cp_off |= (*data++ << 24);
- if (cmd & 0x10) cp_size = *data++;
- if (cmd & 0x20) cp_size |= (*data++ << 8);
- if (cmd & 0x40) cp_size |= (*data++ << 16);
- if (cp_size == 0) cp_size = 0x10000;
-
- copied_from_source += cp_size;
- out += cp_size;
- } else {
- /* write literal into dst */
- added_literal += cmd;
- out += cmd;
- data += cmd;
- }
- }
-
- /* sanity check */
- if (data != top || out != dst_size)
- return -1;
-
- /* delete size is what was _not_ copied from source.
- * edit size is that and literal additions.
- */
- *src_copied = copied_from_source;
- *literal_added = added_literal;
- return 0;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005 Junio C Hamano
- */
-#ifndef COUNT_DELTA_H
-#define COUNT_DELTA_H
-
-int count_delta(void *, unsigned long,
- unsigned long *src_copied, unsigned long *literal_added);
-
-#endif
* The value we return is 1 if we want the pair to be broken,
* or 0 if we do not.
*/
- unsigned long delta_size, base_size, src_copied, literal_added;
- int to_break = 0;
+ unsigned long delta_size, base_size, src_copied, literal_added,
+ src_removed;
*merge_score_p = 0; /* assume no deletion --- "do not break"
* is the default.
&src_copied, &literal_added))
return 0;
+ /* sanity */
+ if (src->size < src_copied)
+ src_copied = src->size;
+ if (dst->size < literal_added + src_copied) {
+ if (src_copied < dst->size)
+ literal_added = dst->size - src_copied;
+ else
+ literal_added = 0;
+ }
+ src_removed = src->size - src_copied;
+
/* Compute merge-score, which is "how much is removed
* from the source material". The clean-up stage will
* merge the surviving pair together if the score is
* less than the minimum, after rename/copy runs.
*/
- if (src->size <= src_copied)
- ; /* all copied, nothing removed */
- else {
- delta_size = src->size - src_copied;
- *merge_score_p = delta_size * MAX_SCORE / src->size;
- }
-
+ *merge_score_p = src_removed * MAX_SCORE / src->size;
+
/* Extent of damage, which counts both inserts and
* deletes.
*/
- if (src->size + literal_added <= src_copied)
- delta_size = 0; /* avoid wrapping around */
- else
- delta_size = (src->size - src_copied) + literal_added;
-
- /* We break if the edit exceeds the minimum.
- * i.e. (break_score / MAX_SCORE < delta_size / base_size)
+ delta_size = src_removed + literal_added;
+ if (delta_size * MAX_SCORE / base_size < break_score)
+ return 0;
+
+ /* If you removed a lot without adding new material, that is
+ * not really a rewrite.
*/
- if (break_score * base_size < delta_size * MAX_SCORE)
- to_break = 1;
+ if ((src->size * break_score < src_removed * MAX_SCORE) &&
+ (literal_added * 20 < src_removed) &&
+ (literal_added * 20 < src_copied))
+ return 0;
- return to_break;
+ return 1;
}
void diffcore_break(int break_score)
#include "cache.h"
#include "diff.h"
#include "diffcore.h"
-#include "delta.h"
-#include "count-delta.h"
-
-static int diffcore_count_changes_1(void *src, unsigned long src_size,
- void *dst, unsigned long dst_size,
- unsigned long delta_limit,
- unsigned long *src_copied,
- unsigned long *literal_added)
+
+/*
+ * Idea here is very simple.
+ *
+ * We have total of (sz-N+1) N-byte overlapping sequences in buf whose
+ * size is sz. If the same N-byte sequence appears in both source and
+ * destination, we say the byte that starts that sequence is shared
+ * between them (i.e. copied from source to destination).
+ *
+ * For each possible N-byte sequence, if the source buffer has more
+ * instances of it than the destination buffer, that means the
+ * difference are the number of bytes not copied from source to
+ * destination. If the counts are the same, everything was copied
+ * from source to destination. If the destination has more,
+ * everything was copied, and destination added more.
+ *
+ * We are doing an approximation so we do not really have to waste
+ * memory by actually storing the sequence. We just hash them into
+ * somewhere around 2^16 hashbuckets and count the occurrences.
+ *
+ * The length of the sequence is arbitrarily set to 8 for now.
+ */
+
+#define HASHBASE 65537 /* next_prime(2^16) */
+
+static void hash_chars(unsigned char *buf, unsigned long sz, int *count)
{
- void *delta;
- unsigned long delta_size;
-
- delta = diff_delta(src, src_size,
- dst, dst_size,
- &delta_size, delta_limit);
- if (!delta)
- /* If delta_limit is exceeded, we have too much differences */
- return -1;
+ unsigned int accum1, accum2, i;
- /* Estimate the edit size by interpreting delta. */
- if (count_delta(delta, delta_size, src_copied, literal_added)) {
- free(delta);
- return -1;
+ /* an 8-byte shift register made of accum1 and accum2. New
+ * bytes come at LSB of accum2, and shifted up to accum1
+ */
+ for (i = accum1 = accum2 = 0; i < 7; i++, sz--) {
+ accum1 = (accum1 << 8) | (accum2 >> 24);
+ accum2 = (accum2 << 8) | *buf++;
+ }
+ while (sz) {
+ accum1 = (accum1 << 8) | (accum2 >> 24);
+ accum2 = (accum2 << 8) | *buf++;
+ /* We want something that hashes permuted byte
+ * sequences nicely; simpler hash like (accum1 ^
+ * accum2) does not perform as well.
+ */
+ i = (accum1 + accum2 * 0x61) % HASHBASE;
+ count[i]++;
+ sz--;
}
- free(delta);
- return 0;
}
int diffcore_count_changes(void *src, unsigned long src_size,
unsigned long *src_copied,
unsigned long *literal_added)
{
- return diffcore_count_changes_1(src, src_size,
- dst, dst_size,
- delta_limit,
- src_copied,
- literal_added);
+ int *src_count, *dst_count, i;
+ unsigned long sc, la;
+
+ if (src_size < 8 || dst_size < 8)
+ return -1;
+
+ src_count = xcalloc(HASHBASE * 2, sizeof(int));
+ dst_count = src_count + HASHBASE;
+ hash_chars(src, src_size, src_count);
+ hash_chars(dst, dst_size, dst_count);
+
+ sc = la = 0;
+ for (i = 0; i < HASHBASE; i++) {
+ if (src_count[i] < dst_count[i]) {
+ la += dst_count[i] - src_count[i];
+ sc += src_count[i];
+ }
+ else /* i.e. if (dst_count[i] <= src_count[i]) */
+ sc += dst_count[i];
+ }
+ *src_copied = sc;
+ *literal_added = la;
+ free(src_count);
+ return 0;
}
&src_copied, &literal_added))
return 0;
- /* Extent of damage */
- if (src->size + literal_added < src_copied)
- delta_size = 0;
- else
- delta_size = (src->size - src_copied) + literal_added;
-
- /*
- * Now we will give some score to it. 100% edit gets 0 points
- * and 0% edit gets MAX_SCORE points.
+ /* How similar are they?
+ * what percentage of material in dst are from source?
*/
- score = MAX_SCORE - (MAX_SCORE * delta_size / base_size);
- if (score < 0) return 0;
- if (MAX_SCORE < score) return MAX_SCORE;
+ if (dst->size < src_copied)
+ score = MAX_SCORE;
+ else if (!dst->size)
+ score = 0; /* should not happen */
+ else
+ score = src_copied * MAX_SCORE / dst->size;
return score;
}
*/
#define MAX_SCORE 60000.0
#define DEFAULT_RENAME_SCORE 30000 /* rename/copy similarity minimum (50%) */
-#define DEFAULT_BREAK_SCORE 30000 /* minimum for break to happen (50%)*/
-#define DEFAULT_MERGE_SCORE 48000 /* maximum for break-merge to happen (80%)*/
+#define DEFAULT_BREAK_SCORE 30000 /* minimum for break to happen (50%) */
+#define DEFAULT_MERGE_SCORE 36000 /* maximum for break-merge to happen 60%) */
#define MINIMUM_BREAK_SIZE 400 /* do not break a file smaller than this */
projects / git.git / commitdiff