From 65056021f2d2dcb7a72f05c5d6cbbd79a79b9d40 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Fri, 28 Apr 2006 23:20:52 -0700 Subject: built-in diff. This starts to replace the shell script version of "git diff". Signed-off-by: Junio C Hamano --- builtin-diff.c | 332 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 332 insertions(+) create mode 100644 builtin-diff.c (limited to 'builtin-diff.c') diff --git a/builtin-diff.c b/builtin-diff.c new file mode 100644 index 0000000000..196821294e --- /dev/null +++ b/builtin-diff.c @@ -0,0 +1,332 @@ +/* + * Builtin "git diff" + * + * Copyright (c) 2006 Junio C Hamano + */ +#include "cache.h" +#include "commit.h" +#include "blob.h" +#include "tag.h" +#include "diff.h" +#include "diffcore.h" +#include "revision.h" +#include "log-tree.h" +#include "builtin.h" + +/* NEEDSWORK: struct object has place for name but we _do_ + * know mode when we extracted the blob out of a tree, which + * we currently lose. + */ +struct blobinfo { + unsigned char sha1[20]; + const char *name; +}; + +static const char builtin_diff_usage[] = +"diff {0,2} -- *"; + +static int builtin_diff_files(struct rev_info *revs, + int argc, const char **argv) +{ + int silent = 0; + while (1 < argc) { + const char *arg = argv[1]; + if (!strcmp(arg, "--base")) + revs->max_count = 1; + else if (!strcmp(arg, "--ours")) + revs->max_count = 2; + else if (!strcmp(arg, "--theirs")) + revs->max_count = 3; + else if (!strcmp(arg, "-q")) + silent = 1; + else if (!strcmp(arg, "--raw")) + revs->diffopt.output_format = DIFF_FORMAT_RAW; + else + usage(builtin_diff_usage); + argv++; argc--; + } + /* + * Make sure there are NO revision (i.e. pending object) parameter, + * rev.max_count is reasonable (0 <= n <= 3), + * there is no other revision filtering parameters. + */ + if (revs->pending_objects || + revs->min_age != -1 || + revs->max_age != -1) + usage(builtin_diff_usage); + /* + * Backward compatibility wart - "diff-files -s" used to + * defeat the common diff option "-s" which asked for + * DIFF_FORMAT_NO_OUTPUT. + */ + if (revs->diffopt.output_format == DIFF_FORMAT_NO_OUTPUT) + revs->diffopt.output_format = DIFF_FORMAT_RAW; + return run_diff_files(revs, silent); +} + +static void stuff_change(struct diff_options *opt, + unsigned old_mode, unsigned new_mode, + const unsigned char *old_sha1, + const unsigned char *new_sha1, + const char *old_name, + const char *new_name) +{ + struct diff_filespec *one, *two; + + if (memcmp(null_sha1, old_sha1, 20) && + memcmp(null_sha1, new_sha1, 20) && + !memcmp(old_sha1, new_sha1, 20)) + return; + + if (opt->reverse_diff) { + unsigned tmp; + const + const unsigned char *tmp_u; + const char *tmp_c; + tmp = old_mode; old_mode = new_mode; new_mode = tmp; + tmp_u = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_u; + tmp_c = old_name; old_name = new_name; new_name = tmp_c; + } + one = alloc_filespec(old_name); + two = alloc_filespec(new_name); + fill_filespec(one, old_sha1, old_mode); + fill_filespec(two, new_sha1, new_mode); + + /* NEEDSWORK: shouldn't this part of diffopt??? */ + diff_queue(&diff_queued_diff, one, two); +} + +static int builtin_diff_b_f(struct rev_info *revs, + int argc, const char **argv, + struct blobinfo *blob, + const char *path) +{ + /* Blob vs file in the working tree*/ + struct stat st; + + while (1 < argc) { + const char *arg = argv[1]; + if (!strcmp(arg, "--raw")) + revs->diffopt.output_format = DIFF_FORMAT_RAW; + else + usage(builtin_diff_usage); + argv++; argc--; + } + if (lstat(path, &st)) + die("'%s': %s", path, strerror(errno)); + if (!(S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))) + die("'%s': not a regular file or symlink", path); + stuff_change(&revs->diffopt, + canon_mode(st.st_mode), canon_mode(st.st_mode), + blob[0].sha1, null_sha1, + blob[0].name, path); + diffcore_std(&revs->diffopt); + diff_flush(&revs->diffopt); + return 0; +} + +static int builtin_diff_blobs(struct rev_info *revs, + int argc, const char **argv, + struct blobinfo *blob) +{ + /* Blobs */ + unsigned mode = canon_mode(S_IFREG | 0644); + + while (1 < argc) { + const char *arg = argv[1]; + if (!strcmp(arg, "--raw")) + revs->diffopt.output_format = DIFF_FORMAT_RAW; + else + usage(builtin_diff_usage); + argv++; argc--; + } + stuff_change(&revs->diffopt, + mode, mode, + blob[0].sha1, blob[1].sha1, + blob[1].name, blob[1].name); + diffcore_std(&revs->diffopt); + diff_flush(&revs->diffopt); + return 0; +} + +static int builtin_diff_index(struct rev_info *revs, + int argc, const char **argv) +{ + int cached = 0; + while (1 < argc) { + const char *arg = argv[1]; + if (!strcmp(arg, "--cached")) + cached = 1; + else if (!strcmp(arg, "--raw")) + revs->diffopt.output_format = DIFF_FORMAT_RAW; + else + usage(builtin_diff_usage); + argv++; argc--; + } + /* + * Make sure there is one revision (i.e. pending object), + * and there is no revision filtering parameters. + */ + if (!revs->pending_objects || revs->pending_objects->next || + revs->max_count != -1 || revs->min_age != -1 || + revs->max_age != -1) + usage(builtin_diff_usage); + return run_diff_index(revs, cached); +} + +static int builtin_diff_tree(struct rev_info *revs, + int argc, const char **argv, + struct object_list *ent) +{ + /* We saw two trees, ent[0] and ent[1]. + * unless ent[0] is unintesting, they are swapped + */ + const unsigned char *(sha1[2]); + int swap = 1; + while (1 < argc) { + const char *arg = argv[1]; + if (!strcmp(arg, "--raw")) + revs->diffopt.output_format = DIFF_FORMAT_RAW; + else + usage(builtin_diff_usage); + argv++; argc--; + } + if (ent[0].item->flags & UNINTERESTING) + swap = 0; + sha1[swap] = ent[0].item->sha1; + sha1[1-swap] = ent[1].item->sha1; + diff_tree_sha1(sha1[0], sha1[1], "", &revs->diffopt); + log_tree_diff_flush(revs); + return 0; +} + +static void add_head(struct rev_info *revs) +{ + unsigned char sha1[20]; + struct object *obj; + if (get_sha1("HEAD", sha1)) + return; + obj = parse_object(sha1); + if (!obj) + return; + add_object(obj, &revs->pending_objects, NULL, "HEAD"); +} + +int cmd_diff(int argc, const char **argv, char **envp) +{ + struct rev_info rev; + struct object_list *list, ent[2]; + int ents = 0, blobs = 0, paths = 0; + const char *path = NULL; + struct blobinfo blob[2]; + + /* + * We could get N tree-ish in the rev.pending_objects list. + * Also there could be M blobs there, and P pathspecs. + * + * N=0, M=0: + * cache vs files (diff-files) + * N=0, M=2: + * compare two random blobs. P must be zero. + * N=0, M=1, P=1: + * compare a blob with a working tree file. + * + * N=1, M=0: + * tree vs cache (diff-index --cached) + * + * N=2, M=0: + * tree vs tree (diff-tree) + * + * Other cases are errors. + */ + + git_config(git_diff_config); + init_revisions(&rev); + rev.diffopt.output_format = DIFF_FORMAT_PATCH; + + argc = setup_revisions(argc, argv, &rev, NULL); + /* Do we have --cached and not have a pending object, then + * default to HEAD by hand. Eek. + */ + if (!rev.pending_objects) { + int i; + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + if (!strcmp(arg, "--")) + break; + else if (!strcmp(arg, "--cached")) { + add_head(&rev); + break; + } + } + } + + for (list = rev.pending_objects; list; list = list->next) { + struct object *obj = list->item; + const char *name = list->name; + int flags = (obj->flags & UNINTERESTING); + if (!obj->parsed) + obj = parse_object(obj->sha1); + obj = deref_tag(obj, NULL, 0); + if (!obj) + die("invalid object '%s' given.", name); + if (!strcmp(obj->type, commit_type)) + obj = &((struct commit *)obj)->tree->object; + if (!strcmp(obj->type, tree_type)) { + if (2 <= ents) + die("more than two trees given: '%s'", name); + obj->flags |= flags; + ent[ents].item = obj; + ent[ents].name = name; + ents++; + continue; + } + if (!strcmp(obj->type, blob_type)) { + if (2 <= blobs) + die("more than two blobs given: '%s'", name); + memcpy(blob[blobs].sha1, obj->sha1, 20); + blob[blobs].name = name; + blobs++; + continue; + + } + die("unhandled object '%s' given.", name); + } + if (rev.prune_data) { + const char **pathspec = rev.prune_data; + while (*pathspec) { + if (!path) + path = *pathspec; + paths++; + pathspec++; + } + } + + /* + * Now, do the arguments look reasonable? + */ + if (!ents) { + switch (blobs) { + case 0: + return builtin_diff_files(&rev, argc, argv); + break; + case 1: + if (paths != 1) + usage(builtin_diff_usage); + return builtin_diff_b_f(&rev, argc, argv, blob, path); + break; + case 2: + return builtin_diff_blobs(&rev, argc, argv, blob); + break; + default: + usage(builtin_diff_usage); + } + } + else if (blobs) + usage(builtin_diff_usage); + else if (ents == 1) + return builtin_diff_index(&rev, argc, argv); + else if (ents == 2) + return builtin_diff_tree(&rev, argc, argv, ent); + usage(builtin_diff_usage); +} -- cgit v1.2.3 From 0fe7c1de16f71312e6adac4b85bddf0d62a47168 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sat, 29 Apr 2006 01:24:49 -0700 Subject: built-in diff: assorted updates. "git diff(n)" without --base, --ours, etc. defaults to --cc, which usually is the same as -p unless you are in the middle of a conflicted merge, just like the shell script version. "git diff(n) blobA blobB path" complains and dies. "git diff(n) tree0 tree1 tree2...treeN" does combined diff that shows a merge of tree1..treeN to result in tree0. Giving "-c" option to any command that defaults to "--cc" turns off dense-combined flag. Signed-off-by: Junio C Hamano --- builtin-diff.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 46 insertions(+), 9 deletions(-) (limited to 'builtin-diff.c') diff --git a/builtin-diff.c b/builtin-diff.c index 196821294e..c543105b8e 100644 --- a/builtin-diff.c +++ b/builtin-diff.c @@ -47,13 +47,17 @@ static int builtin_diff_files(struct rev_info *revs, } /* * Make sure there are NO revision (i.e. pending object) parameter, - * rev.max_count is reasonable (0 <= n <= 3), - * there is no other revision filtering parameters. + * specified rev.max_count is reasonable (0 <= n <= 3), and + * there is no other revision filtering parameter. */ if (revs->pending_objects || revs->min_age != -1 || - revs->max_age != -1) + revs->max_age != -1 || + 3 < revs->max_count) usage(builtin_diff_usage); + if (revs->max_count < 0 && + (revs->diffopt.output_format == DIFF_FORMAT_PATCH)) + revs->combine_merges = revs->dense_combined_merges = 1; /* * Backward compatibility wart - "diff-files -s" used to * defeat the common diff option "-s" which asked for @@ -178,9 +182,6 @@ static int builtin_diff_tree(struct rev_info *revs, int argc, const char **argv, struct object_list *ent) { - /* We saw two trees, ent[0] and ent[1]. - * unless ent[0] is unintesting, they are swapped - */ const unsigned char *(sha1[2]); int swap = 1; while (1 < argc) { @@ -191,6 +192,10 @@ static int builtin_diff_tree(struct rev_info *revs, usage(builtin_diff_usage); argv++; argc--; } + + /* We saw two trees, ent[0] and ent[1]. + * unless ent[0] is unintesting, they are swapped + */ if (ent[0].item->flags & UNINTERESTING) swap = 0; sha1[swap] = ent[0].item->sha1; @@ -200,6 +205,33 @@ static int builtin_diff_tree(struct rev_info *revs, return 0; } +static int builtin_diff_combined(struct rev_info *revs, + int argc, const char **argv, + struct object_list *ent, + int ents) +{ + const unsigned char (*parent)[20]; + int i; + + while (1 < argc) { + const char *arg = argv[1]; + if (!strcmp(arg, "--raw")) + revs->diffopt.output_format = DIFF_FORMAT_RAW; + else + usage(builtin_diff_usage); + argv++; argc--; + } + if (!revs->dense_combined_merges && !revs->combine_merges) + revs->dense_combined_merges = revs->combine_merges = 1; + parent = xmalloc(ents * sizeof(*parent)); + /* Again, the revs are all reverse */ + for (i = 0; i < ents; i++) + memcpy(parent + i, ent[ents - 1 - i].item->sha1, 20); + diff_tree_combined(parent[0], parent + 1, ents - 1, + revs->dense_combined_merges, revs); + return 0; +} + static void add_head(struct rev_info *revs) { unsigned char sha1[20]; @@ -215,7 +247,7 @@ static void add_head(struct rev_info *revs) int cmd_diff(int argc, const char **argv, char **envp) { struct rev_info rev; - struct object_list *list, ent[2]; + struct object_list *list, ent[100]; int ents = 0, blobs = 0, paths = 0; const char *path = NULL; struct blobinfo blob[2]; @@ -273,8 +305,9 @@ int cmd_diff(int argc, const char **argv, char **envp) if (!strcmp(obj->type, commit_type)) obj = &((struct commit *)obj)->tree->object; if (!strcmp(obj->type, tree_type)) { - if (2 <= ents) - die("more than two trees given: '%s'", name); + if (ARRAY_SIZE(ent) <= ents) + die("more than %d trees given: '%s'", + ARRAY_SIZE(ent), name); obj->flags |= flags; ent[ents].item = obj; ent[ents].name = name; @@ -316,6 +349,8 @@ int cmd_diff(int argc, const char **argv, char **envp) return builtin_diff_b_f(&rev, argc, argv, blob, path); break; case 2: + if (paths) + usage(builtin_diff_usage); return builtin_diff_blobs(&rev, argc, argv, blob); break; default: @@ -328,5 +363,7 @@ int cmd_diff(int argc, const char **argv, char **envp) return builtin_diff_index(&rev, argc, argv); else if (ents == 2) return builtin_diff_tree(&rev, argc, argv, ent); + else + return builtin_diff_combined(&rev, argc, argv, ent, ents); usage(builtin_diff_usage); } -- cgit v1.2.3 From 334b506a3487f762493d3db2d3053114f25590e3 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sun, 30 Apr 2006 00:26:41 -0700 Subject: builtin-diff.c: die() formatting type fix. Signed-off-by: Junio C Hamano --- builtin-diff.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'builtin-diff.c') diff --git a/builtin-diff.c b/builtin-diff.c index c543105b8e..b6114ce948 100644 --- a/builtin-diff.c +++ b/builtin-diff.c @@ -307,7 +307,7 @@ int cmd_diff(int argc, const char **argv, char **envp) if (!strcmp(obj->type, tree_type)) { if (ARRAY_SIZE(ent) <= ents) die("more than %d trees given: '%s'", - ARRAY_SIZE(ent), name); + (int) ARRAY_SIZE(ent), name); obj->flags |= flags; ent[ents].item = obj; ent[ents].name = name; -- cgit v1.2.3