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[PATCH] Introducing software archaeologist's tool "pickaxe".
This steals the "pickaxe" feature from JIT and make it available to the bare Plumbing layer. From the command line, the user gives a string he is intersted in. Using the diff-core infrastructure previously introduced, it filters the differences to limit the output only to the diffs between <src> and <dst> where the string appears only in one but not in the other. For example: $ ./git-rev-list HEAD | ./git-diff-tree -Sdiff-tree-helper --stdin -M would show the diffs that touch the string "diff-tree-helper". In real software-archaeologist application, you would typically look for a few to several lines of code and see where that code came from. The "pickaxe" module runs after "rename/copy detection" module, so it even crosses the file rename boundary, as the above example demonstrates. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
parent
427dcb4bca
commit
52e9578985
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@ -9,7 +9,7 @@ git-diff-cache - Compares content and mode of blobs between the cache and reposi
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SYNOPSIS
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--------
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'git-diff-cache' [-p] [-r] [-z] [-m] [-M] [-R] [-C] [--cached] <tree-ish>
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'git-diff-cache' [-p] [-r] [-z] [-m] [-M] [-R] [-C] [-S<string>] [--cached] <tree-ish>
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DESCRIPTION
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-----------
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@ -39,6 +39,10 @@ OPTIONS
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-C::
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Detect copies as well as renames; implies -p.
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-S<string>::
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Look for differences that contains the change in <string>.
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-R::
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Output diff in reverse.
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@ -9,7 +9,7 @@ git-diff-files - Compares files in the working tree and the cache
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SYNOPSIS
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--------
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'git-diff-files' [-p] [-q] [-r] [-z] [-M] [-C] [-R] [<pattern>...]
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'git-diff-files' [-p] [-q] [-r] [-z] [-M] [-C] [-R] [-S<string>] [<pattern>...]
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DESCRIPTION
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-----------
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@ -35,6 +35,10 @@ OPTIONS
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-C::
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Detect copies as well as renames; implies -p.
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-S<string>::
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Look for differences that contains the change in <string>.
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-r::
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This flag does not mean anything. It is there only to match
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git-diff-tree. Unlike git-diff-tree, git-diff-files always looks
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@ -9,7 +9,7 @@ git-diff-helper - Generates patch format output for git-diff-*
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SYNOPSIS
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--------
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'git-diff-helper' [-z] [-R] [-M] [-C]
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'git-diff-helper' [-z] [-R] [-M] [-C] [-S<string>]
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DESCRIPTION
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-----------
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@ -37,6 +37,10 @@ OPTIONS
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-C::
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Detect copies as well as renames.
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-S<string>::
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Look for differences that contains the change in <string>.
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See Also
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--------
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The section on generating patches in link:git-diff-cache.html[git-diff-cache]
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@ -9,7 +9,7 @@ git-diff-tree - Compares the content and mode of blobs found via two tree object
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SYNOPSIS
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--------
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'git-diff-tree' [-p] [-r] [-z] [--stdin] [-M] [-R] [-C] [-m] [-s] [-v] <tree-ish> <tree-ish> [<pattern>]\*
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'git-diff-tree' [-p] [-r] [-z] [--stdin] [-M] [-R] [-C] [-S<string>] [-m] [-s] [-v] <tree-ish> <tree-ish> [<pattern>]\*
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DESCRIPTION
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-----------
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@ -43,6 +43,9 @@ OPTIONS
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-R::
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Output diff in reverse.
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-S<string>::
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Look for differences that contains the change in <string>.
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-r::
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recurse
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3
Makefile
3
Makefile
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@ -45,7 +45,7 @@ LIB_H += strbuf.h
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LIB_OBJS += strbuf.o
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LIB_H += diff.h
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LIB_OBJS += diff.o diffcore-rename.o
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LIB_OBJS += diff.o diffcore-rename.o diffcore-pickaxe.o
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LIB_OBJS += gitenv.o
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@ -125,6 +125,7 @@ strbuf.o: $(LIB_H)
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gitenv.o: $(LIB_H)
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diff.o: $(LIB_H)
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diffcore-rename.o : $(LIB_H)
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diffcore-pickaxe.o : $(LIB_H)
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test: all
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make -C t/ all
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11
diff-cache.c
11
diff-cache.c
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@ -8,6 +8,7 @@ static int line_termination = '\n';
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static int detect_rename = 0;
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static int reverse_diff = 0;
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static int diff_score_opt = 0;
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static char *pickaxe = 0;
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/* A file entry went away or appeared */
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static void show_file(const char *prefix, struct cache_entry *ce, unsigned char *sha1, unsigned int mode)
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@ -153,7 +154,7 @@ static void mark_merge_entries(void)
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}
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static char *diff_cache_usage =
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"git-diff-cache [-p] [-r] [-z] [-m] [-M] [-C] [-R] [--cached] <tree-ish>";
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"git-diff-cache [-p] [-r] [-z] [-m] [-M] [-C] [-R] [-S<string>] [--cached] <tree-ish>";
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int main(int argc, char **argv)
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{
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@ -194,6 +195,10 @@ int main(int argc, char **argv)
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reverse_diff = 1;
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continue;
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}
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if (!strcmp(arg, "-S")) {
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pickaxe = arg + 2;
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continue;
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}
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if (!strcmp(arg, "-m")) {
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match_nonexisting = 1;
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continue;
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@ -208,8 +213,8 @@ int main(int argc, char **argv)
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if (argc != 2 || get_sha1(argv[1], tree_sha1))
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usage(diff_cache_usage);
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diff_setup(detect_rename, diff_score_opt, reverse_diff,
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(generate_patch ? -1 : line_termination),
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diff_setup(detect_rename, diff_score_opt, pickaxe,
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reverse_diff, (generate_patch ? -1 : line_termination),
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NULL, 0);
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mark_merge_entries();
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@ -7,13 +7,14 @@
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#include "diff.h"
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static const char *diff_files_usage =
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"git-diff-files [-p] [-q] [-r] [-z] [-M] [-C] [-R] [paths...]";
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"git-diff-files [-p] [-q] [-r] [-z] [-M] [-C] [-R] [-S<string>] [paths...]";
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static int generate_patch = 0;
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static int line_termination = '\n';
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static int detect_rename = 0;
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static int reverse_diff = 0;
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static int diff_score_opt = 0;
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static char *pickaxe = 0;
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static int silent = 0;
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static int matches_pathspec(struct cache_entry *ce, char **spec, int cnt)
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@ -67,6 +68,8 @@ int main(int argc, char **argv)
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line_termination = 0;
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else if (!strcmp(argv[1], "-R"))
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reverse_diff = 1;
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else if (!strcmp(argv[1], "-S"))
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pickaxe = argv[1] + 2;
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else if (!strncmp(argv[1], "-M", 2)) {
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diff_score_opt = diff_scoreopt_parse(argv[1]);
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detect_rename = generate_patch = 1;
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@ -89,8 +92,8 @@ int main(int argc, char **argv)
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exit(1);
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}
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diff_setup(detect_rename, diff_score_opt, reverse_diff,
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(generate_patch ? -1 : line_termination),
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diff_setup(detect_rename, diff_score_opt, pickaxe,
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reverse_diff, (generate_patch ? -1 : line_termination),
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NULL, 0);
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for (i = 0; i < entries; i++) {
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@ -9,6 +9,7 @@
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static int detect_rename = 0;
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static int diff_score_opt = 0;
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static int generate_patch = 1;
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static char *pickaxe = 0;
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static int parse_oneside_change(const char *cp, int *mode,
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unsigned char *sha1, char *path)
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}
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static const char *diff_helper_usage =
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"git-diff-helper [-z] [-R] [-M] [-C] paths...";
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"git-diff-helper [-z] [-R] [-M] [-C] [-S<string>] paths...";
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int main(int ac, const char **av) {
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struct strbuf sb;
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@ -117,14 +118,17 @@ int main(int ac, const char **av) {
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detect_rename = 2;
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diff_score_opt = diff_scoreopt_parse(av[1]);
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}
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else if (av[1][1] == 'S') {
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pickaxe = av[1] + 2;
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}
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else
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usage(diff_helper_usage);
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ac--; av++;
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}
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/* the remaining parameters are paths patterns */
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diff_setup(detect_rename, diff_score_opt, reverse,
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(generate_patch ? -1 : line_termination),
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diff_setup(detect_rename, diff_score_opt, pickaxe,
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reverse, (generate_patch ? -1 : line_termination),
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av+1, ac-1);
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while (1) {
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15
diff-tree.c
15
diff-tree.c
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@ -13,6 +13,7 @@ static int generate_patch = 0;
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static int detect_rename = 0;
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static int reverse_diff = 0;
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static int diff_score_opt = 0;
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static char *pickaxe = 0;
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static const char *header = NULL;
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static const char *header_prefix = "";
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@ -271,8 +272,8 @@ static int diff_tree_sha1_top(const unsigned char *old,
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{
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int ret;
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diff_setup(detect_rename, diff_score_opt, reverse_diff,
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(generate_patch ? -1 : line_termination),
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diff_setup(detect_rename, diff_score_opt, pickaxe,
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reverse_diff, (generate_patch ? -1 : line_termination),
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NULL, 0);
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ret = diff_tree_sha1(old, new, base);
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diff_flush();
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@ -285,8 +286,8 @@ static int diff_root_tree(const unsigned char *new, const char *base)
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void *tree;
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unsigned long size;
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diff_setup(detect_rename, diff_score_opt, reverse_diff,
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(generate_patch ? -1 : line_termination),
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diff_setup(detect_rename, diff_score_opt, pickaxe,
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reverse_diff, (generate_patch ? -1 : line_termination),
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NULL, 0);
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tree = read_object_with_reference(new, "tree", &size, NULL);
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if (!tree)
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@ -430,7 +431,7 @@ static int diff_tree_stdin(char *line)
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}
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static char *diff_tree_usage =
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"git-diff-tree [-p] [-r] [-z] [--stdin] [-M] [-C] [-R] [-m] [-s] [-v] <tree-ish> <tree-ish>";
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"git-diff-tree [-p] [-r] [-z] [--stdin] [-M] [-C] [-R] [-S<string>] [-m] [-s] [-v] <tree-ish> <tree-ish>";
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int main(int argc, char **argv)
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{
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recursive = generate_patch = 1;
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continue;
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}
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if (!strncmp(arg, "-S", 2)) {
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pickaxe = arg + 2;
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continue;
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}
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if (!strncmp(arg, "-M", 2)) {
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detect_rename = recursive = generate_patch = 1;
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diff_score_opt = diff_scoreopt_parse(arg);
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23
diff.c
23
diff.c
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@ -17,6 +17,7 @@ static int reverse_diff;
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static int diff_raw_output = -1;
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static const char **pathspec;
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static int speccnt;
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static const char *pickaxe;
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static int minimum_score;
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static const char *external_diff(void)
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@ -511,8 +512,9 @@ int diff_scoreopt_parse(const char *opt)
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return MAX_SCORE * num / scale;
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}
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void diff_setup(int detect_rename_, int minimum_score_, int reverse_diff_,
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int diff_raw_output_,
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void diff_setup(int detect_rename_, int minimum_score_,
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char *pickaxe_,
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int reverse_diff_, int diff_raw_output_,
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const char **pathspec_, int speccnt_)
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{
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detect_rename = detect_rename_;
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@ -521,15 +523,16 @@ void diff_setup(int detect_rename_, int minimum_score_, int reverse_diff_,
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diff_raw_output = diff_raw_output_;
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speccnt = speccnt_;
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minimum_score = minimum_score_ ? : DEFAULT_MINIMUM_SCORE;
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pickaxe = pickaxe_;
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}
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static struct diff_queue_struct queued_diff;
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struct diff_file_pair *diff_queue(struct diff_queue_struct *queue,
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struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
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struct diff_filespec *one,
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struct diff_filespec *two)
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{
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struct diff_file_pair *dp = xmalloc(sizeof(*dp));
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struct diff_filepair *dp = xmalloc(sizeof(*dp));
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dp->one = one;
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dp->two = two;
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dp->xfrm_msg = 0;
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@ -549,7 +552,7 @@ static const char *git_object_type(unsigned mode)
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return S_ISDIR(mode) ? "tree" : "blob";
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}
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static void diff_flush_raw(struct diff_file_pair *p)
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static void diff_flush_raw(struct diff_filepair *p)
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{
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struct diff_filespec *it;
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int addremove;
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@ -583,7 +586,7 @@ static void diff_flush_raw(struct diff_file_pair *p)
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sha1_to_hex(it->sha1), it->path, diff_raw_output);
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}
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static void diff_flush_patch(struct diff_file_pair *p)
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static void diff_flush_patch(struct diff_filepair *p)
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{
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const char *name, *other;
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@ -600,7 +603,7 @@ static int identical(struct diff_filespec *one, struct diff_filespec *two)
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{
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/* This function is written stricter than necessary to support
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* the currently implemented transformers, but the idea is to
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* let transformers to produce diff_file_pairs any way they want,
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* let transformers to produce diff_filepairs any way they want,
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* and filter and clean them up here before producing the output.
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*/
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@ -623,7 +626,7 @@ static int identical(struct diff_filespec *one, struct diff_filespec *two)
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return 0;
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}
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static void diff_flush_one(struct diff_file_pair *p)
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static void diff_flush_one(struct diff_filepair *p)
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{
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if (identical(p->one, p->two))
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return;
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@ -640,11 +643,13 @@ void diff_flush(void)
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if (detect_rename)
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diff_detect_rename(q, detect_rename, minimum_score);
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if (pickaxe)
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diff_pickaxe(q, pickaxe);
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for (i = 0; i < q->nr; i++)
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diff_flush_one(q->queue[i]);
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for (i = 0; i < q->nr; i++) {
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struct diff_file_pair *p = q->queue[i];
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struct diff_filepair *p = q->queue[i];
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diff_free_filespec_data(p->one);
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diff_free_filespec_data(p->two);
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free(p->xfrm_msg);
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1
diff.h
1
diff.h
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@ -20,6 +20,7 @@ extern void diff_unmerge(const char *path);
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extern int diff_scoreopt_parse(const char *opt);
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extern void diff_setup(int detect_rename, int minimum_score,
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char *pickaxe,
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int reverse, int raw_output,
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const char **spec, int cnt);
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56
diffcore-pickaxe.c
Normal file
56
diffcore-pickaxe.c
Normal file
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@ -0,0 +1,56 @@
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/*
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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))
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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 diff_pickaxe(struct diff_queue_struct *q, const char *needle)
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{
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unsigned long len = strlen(needle);
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int i;
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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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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (!p->one->file_valid) {
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if (!p->two->file_valid)
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continue; /* ignore nonsense */
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/* created */
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if (contains(p->two, needle, len))
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diff_queue(&outq, p->one, p->two);
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}
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else if (!p->two->file_valid) {
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if (contains(p->one, needle, len))
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diff_queue(&outq, p->one, p->two);
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}
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else if (contains(p->one, needle, len) !=
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contains(p->two, needle, len))
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diff_queue(&outq, p->one, p->two);
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}
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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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free(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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}
|
|
@ -129,7 +129,7 @@ static void record_rename_pair(struct diff_queue_struct *outq,
|
|||
* To achieve this sort order, we give xform_work the number
|
||||
* above.
|
||||
*/
|
||||
struct diff_file_pair *dp = diff_queue(outq, src, dst);
|
||||
struct diff_filepair *dp = diff_queue(outq, src, dst);
|
||||
dp->xfrm_work = (rank * 2 + 1) | (score<<RENAME_SCORE_SHIFT);
|
||||
dst->xfrm_flags |= RENAME_DST_MATCHED;
|
||||
}
|
||||
|
@ -148,7 +148,7 @@ static void debug_filespec(struct diff_filespec *s, int x, const char *one)
|
|||
s->size, s->xfrm_flags);
|
||||
}
|
||||
|
||||
static void debug_filepair(const struct diff_file_pair *p, int i)
|
||||
static void debug_filepair(const struct diff_filepair *p, int i)
|
||||
{
|
||||
debug_filespec(p->one, i, "one");
|
||||
debug_filespec(p->two, i, "two");
|
||||
|
@ -165,7 +165,7 @@ static void debug_queue(const char *msg, struct diff_queue_struct *q)
|
|||
fprintf(stderr, "%s\n", msg);
|
||||
fprintf(stderr, "q->nr = %d\n", q->nr);
|
||||
for (i = 0; i < q->nr; i++) {
|
||||
struct diff_file_pair *p = q->queue[i];
|
||||
struct diff_filepair *p = q->queue[i];
|
||||
debug_filepair(p, i);
|
||||
}
|
||||
}
|
||||
|
@ -180,8 +180,8 @@ static void debug_queue(const char *msg, struct diff_queue_struct *q)
|
|||
*/
|
||||
static int rank_compare(const void *a_, const void *b_)
|
||||
{
|
||||
const struct diff_file_pair *a = *(const struct diff_file_pair **)a_;
|
||||
const struct diff_file_pair *b = *(const struct diff_file_pair **)b_;
|
||||
const struct diff_filepair *a = *(const struct diff_filepair **)a_;
|
||||
const struct diff_filepair *b = *(const struct diff_filepair **)b_;
|
||||
int a_rank = a->xfrm_work & ((1<<RENAME_SCORE_SHIFT) - 1);
|
||||
int b_rank = b->xfrm_work & ((1<<RENAME_SCORE_SHIFT) - 1);
|
||||
|
||||
|
@ -207,7 +207,7 @@ static int needs_to_stay(struct diff_queue_struct *q, int i,
|
|||
* as the source of rename/copy), we need to copy, not rename.
|
||||
*/
|
||||
while (i < q->nr) {
|
||||
struct diff_file_pair *p = q->queue[i++];
|
||||
struct diff_filepair *p = q->queue[i++];
|
||||
if (!p->two->file_valid)
|
||||
continue; /* removed is fine */
|
||||
if (strcmp(p->one->path, it->path))
|
||||
|
@ -243,15 +243,8 @@ void diff_detect_rename(struct diff_queue_struct *q,
|
|||
srcs[0] = &deleted;
|
||||
srcs[1] = &stay;
|
||||
|
||||
/* NEEDSWORK:
|
||||
* (1) make sure we properly ignore but pass trees.
|
||||
*
|
||||
* (2) make sure we do right thing on the same path deleted
|
||||
* and created in the same patch.
|
||||
*/
|
||||
|
||||
for (i = 0; i < q->nr; i++) {
|
||||
struct diff_file_pair *p = q->queue[i];
|
||||
struct diff_filepair *p = q->queue[i];
|
||||
if (!p->one->file_valid)
|
||||
if (!p->two->file_valid)
|
||||
continue; /* ignore nonsense */
|
||||
|
@ -340,11 +333,11 @@ void diff_detect_rename(struct diff_queue_struct *q,
|
|||
* See comments at the top of record_rename_pair for numbers used
|
||||
* to assign xfrm_work.
|
||||
*
|
||||
* Note that we have not annotated the diff_file_pair with any comment
|
||||
* Note that we have not annotated the diff_filepair with any comment
|
||||
* so there is nothing other than p to free.
|
||||
*/
|
||||
for (i = 0; i < q->nr; i++) {
|
||||
struct diff_file_pair *dp, *p = q->queue[i];
|
||||
struct diff_filepair *dp, *p = q->queue[i];
|
||||
if (!p->one->file_valid) {
|
||||
if (p->two->file_valid) {
|
||||
/* creation */
|
||||
|
@ -378,7 +371,7 @@ void diff_detect_rename(struct diff_queue_struct *q,
|
|||
|
||||
/* Copy it out to q, removing duplicates. */
|
||||
for (i = 0; i < outq.nr; i++) {
|
||||
struct diff_file_pair *p = outq.queue[i];
|
||||
struct diff_filepair *p = outq.queue[i];
|
||||
if (!p->one->file_valid) {
|
||||
/* created */
|
||||
if (p->two->xfrm_flags & RENAME_DST_MATCHED)
|
||||
|
@ -395,7 +388,7 @@ void diff_detect_rename(struct diff_queue_struct *q,
|
|||
}
|
||||
else if (strcmp(p->one->path, p->two->path)) {
|
||||
/* rename or copy */
|
||||
struct diff_file_pair *dp =
|
||||
struct diff_filepair *dp =
|
||||
diff_queue(q, p->one, p->two);
|
||||
int msglen = (strlen(p->one->path) +
|
||||
strlen(p->two->path) + 100);
|
||||
|
|
11
diffcore.h
11
diffcore.h
|
@ -38,7 +38,7 @@ extern void fill_filespec(struct diff_filespec *, const unsigned char *,
|
|||
extern int diff_populate_filespec(struct diff_filespec *);
|
||||
extern void diff_free_filespec_data(struct diff_filespec *);
|
||||
|
||||
struct diff_file_pair {
|
||||
struct diff_filepair {
|
||||
struct diff_filespec *one;
|
||||
struct diff_filespec *two;
|
||||
char *xfrm_msg;
|
||||
|
@ -47,14 +47,15 @@ struct diff_file_pair {
|
|||
};
|
||||
|
||||
struct diff_queue_struct {
|
||||
struct diff_file_pair **queue;
|
||||
struct diff_filepair **queue;
|
||||
int alloc;
|
||||
int nr;
|
||||
};
|
||||
|
||||
extern struct diff_file_pair *diff_queue(struct diff_queue_struct *,
|
||||
struct diff_filespec *,
|
||||
struct diff_filespec *);
|
||||
extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
|
||||
struct diff_filespec *,
|
||||
struct diff_filespec *);
|
||||
extern void diff_detect_rename(struct diff_queue_struct *, int, int);
|
||||
extern void diff_pickaxe(struct diff_queue_struct *, const char *);
|
||||
|
||||
#endif
|
||||
|
|
Loading…
Reference in a new issue