git-commit: document --amend
[gitweb.git] / diff-tree.c
index ed323d877cad1e78e08f84c1e9ee1ebb09f05d91..d1265d796388dd1c1a56c00f793893ee9dc6ed10 100644 (file)
@@ -3,9 +3,13 @@
 #include "commit.h"
 
 static int show_root_diff = 0;
+static int no_commit_id = 0;
 static int verbose_header = 0;
 static int ignore_merges = 1;
+static int combine_merges = 0;
+static int dense_combined_merges = 0;
 static int read_stdin = 0;
+static int always_show_header = 0;
 
 static const char *header = NULL;
 static const char *header_prefix = "";
@@ -13,11 +17,6 @@ static enum cmit_fmt commit_format = CMIT_FMT_RAW;
 
 static struct diff_options diff_options;
 
-static void call_diff_setup_done(void)
-{
-       diff_setup_done(&diff_options);
-}
-
 static int call_diff_flush(void)
 {
        diffcore_std(&diff_options);
@@ -29,7 +28,8 @@ static int call_diff_flush(void)
                return 0;
        }
        if (header) {
-               printf("%s%c", header, diff_options.line_termination);
+               if (!no_commit_id)
+                       printf("%s%c", header, diff_options.line_termination);
                header = NULL;
        }
        diff_flush(&diff_options);
@@ -41,7 +41,6 @@ static int diff_tree_sha1_top(const unsigned char *old,
 {
        int ret;
 
-       call_diff_setup_done();
        ret = diff_tree_sha1(old, new, base, &diff_options);
        call_diff_flush();
        return ret;
@@ -53,8 +52,7 @@ static int diff_root_tree(const unsigned char *new, const char *base)
        void *tree;
        struct tree_desc empty, real;
 
-       call_diff_setup_done();
-       tree = read_object_with_reference(new, "tree", &real.size, NULL);
+       tree = read_object_with_reference(new, tree_type, &real.size, NULL);
        if (!tree)
                die("unable to read root tree (%s)", sha1_to_hex(new));
        real.buf = tree;
@@ -67,52 +65,71 @@ static int diff_root_tree(const unsigned char *new, const char *base)
        return retval;
 }
 
-static const char *generate_header(const char *commit, const char *parent, const char *msg, unsigned long len)
+static const char *generate_header(const unsigned char *commit_sha1,
+                                  const unsigned char *parent_sha1,
+                                  const struct commit *commit)
 {
        static char this_header[16384];
        int offset;
+       unsigned long len;
+       int abbrev = diff_options.abbrev;
+       const char *msg = commit->buffer;
 
        if (!verbose_header)
-               return commit;
-
-       offset = sprintf(this_header, "%s%s (from %s)\n", header_prefix, commit, parent);
-       offset += pretty_print_commit(commit_format, msg, len, this_header + offset, sizeof(this_header) - offset);
+               return sha1_to_hex(commit_sha1);
+
+       len = strlen(msg);
+
+       offset = sprintf(this_header, "%s%s ",
+                        header_prefix,
+                        diff_unique_abbrev(commit_sha1, abbrev));
+       if (commit_sha1 != parent_sha1)
+               offset += sprintf(this_header + offset, "(from %s)\n",
+                                 parent_sha1
+                                 ? diff_unique_abbrev(parent_sha1, abbrev)
+                                 : "root");
+       else
+               offset += sprintf(this_header + offset, "(from parents)\n");
+       offset += pretty_print_commit(commit_format, commit, len,
+                                     this_header + offset,
+                                     sizeof(this_header) - offset, abbrev);
+       if (always_show_header) {
+               puts(this_header);
+               return NULL;
+       }
        return this_header;
 }
 
-static int diff_tree_commit(const unsigned char *commit, const char *name)
+static int diff_tree_commit(struct commit *commit)
 {
-       unsigned long size, offset;
-       char *buf = read_object_with_reference(commit, "commit", &size, NULL);
-
-       if (!buf)
-               return -1;
-
-       if (!name) {
-               static char commit_name[60];
-               strcpy(commit_name, sha1_to_hex(commit));
-               name = commit_name;
-       }
+       struct commit_list *parents;
+       unsigned const char *sha1 = commit->object.sha1;
 
        /* Root commit? */
-       if (show_root_diff && memcmp(buf + 46, "parent ", 7)) {
-               header = generate_header(name, "root", buf, size);
-               diff_root_tree(commit, "");
+       if (show_root_diff && !commit->parents) {
+               header = generate_header(sha1, NULL, commit);
+               diff_root_tree(sha1, "");
        }
 
        /* More than one parent? */
-       if (ignore_merges) {
-               if (!memcmp(buf + 46 + 48, "parent ", 7))
+       if (commit->parents && commit->parents->next) {
+               if (ignore_merges)
                        return 0;
+               else if (combine_merges) {
+                       header = generate_header(sha1, sha1, commit);
+                       header = diff_tree_combined_merge(sha1, header,
+                                                       dense_combined_merges,
+                                                       &diff_options);
+                       if (!header && verbose_header)
+                               header_prefix = "\ndiff-tree ";
+                       return 0;
+               }
        }
 
-       offset = 46;
-       while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
-               unsigned char parent[20];
-               if (get_sha1_hex(buf + offset + 7, parent))
-                       return -1;
-               header = generate_header(name, sha1_to_hex(parent), buf, size);
-               diff_tree_sha1_top(parent, commit, "");
+       for (parents = commit->parents; parents; parents = parents->next) {
+               struct commit *parent = parents->item;
+               header = generate_header(sha1, parent->object.sha1, commit);
+               diff_tree_sha1_top(parent->object.sha1, sha1, "");
                if (!header && verbose_header) {
                        header_prefix = "\ndiff-tree ";
                        /*
@@ -120,36 +137,58 @@ static int diff_tree_commit(const unsigned char *commit, const char *name)
                         * don't print the diffs.
                         */
                }
-               offset += 48;
        }
-       free(buf);
        return 0;
 }
 
+static int diff_tree_commit_sha1(const unsigned char *sha1)
+{
+       struct commit *commit = lookup_commit_reference(sha1);
+       if (!commit)
+               return -1;
+       return diff_tree_commit(commit);
+}
+
 static int diff_tree_stdin(char *line)
 {
        int len = strlen(line);
-       unsigned char commit[20], parent[20];
-       static char this_header[1000];
+       unsigned char sha1[20];
+       struct commit *commit;
 
        if (!len || line[len-1] != '\n')
                return -1;
        line[len-1] = 0;
-       if (get_sha1_hex(line, commit))
+       if (get_sha1_hex(line, sha1))
                return -1;
-       if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
-               line[40] = 0;
-               line[81] = 0;
-               sprintf(this_header, "%s (from %s)\n", line, line+41);
-               header = this_header;
-               return diff_tree_sha1_top(parent, commit, "");
+       commit = lookup_commit(sha1);
+       if (!commit || parse_commit(commit))
+               return -1;
+       if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
+               /* Graft the fake parents locally to the commit */
+               int pos = 41;
+               struct commit_list **pptr, *parents;
+
+               /* Free the real parent list */
+               for (parents = commit->parents; parents; ) {
+                       struct commit_list *tmp = parents->next;
+                       free(parents);
+                       parents = tmp;
+               }
+               commit->parents = NULL;
+               pptr = &(commit->parents);
+               while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
+                       struct commit *parent = lookup_commit(sha1);
+                       if (parent) {
+                               pptr = &commit_list_insert(parent, pptr)->next;
+                       }
+                       pos += 41;
+               }
        }
-       line[40] = 0;
-       return diff_tree_commit(commit, line);
+       return diff_tree_commit(commit);
 }
 
 static const char diff_tree_usage[] =
-"git-diff-tree [--stdin] [-m] [-s] [-v] [--pretty] [-t] [-r] [--root] "
+"git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
 "  -r            diff recursively\n"
 "  --root        include the initial commit as diff against /dev/null\n"
@@ -162,7 +201,7 @@ int main(int argc, const char **argv)
        unsigned char sha1[2][20];
        const char *prefix = setup_git_directory();
 
-       git_config(git_default_config);
+       git_config(git_diff_config);
        nr_sha1 = 0;
        diff_setup(&diff_options);
 
@@ -212,6 +251,14 @@ int main(int argc, const char **argv)
                        ignore_merges = 0;
                        continue;
                }
+               if (!strcmp(arg, "-c")) {
+                       combine_merges = 1;
+                       continue;
+               }
+               if (!strcmp(arg, "--cc")) {
+                       dense_combined_merges = combine_merges = 1;
+                       continue;
+               }
                if (!strcmp(arg, "-v")) {
                        verbose_header = 1;
                        header_prefix = "diff-tree ";
@@ -231,12 +278,29 @@ int main(int argc, const char **argv)
                        show_root_diff = 1;
                        continue;
                }
+               if (!strcmp(arg, "--no-commit-id")) {
+                       no_commit_id = 1;
+                       continue;
+               }
+               if (!strcmp(arg, "--always")) {
+                       always_show_header = 1;
+                       continue;
+               }
                usage(diff_tree_usage);
        }
+
+       if (combine_merges)
+               ignore_merges = 0;
+
+       /* We can only do dense combined merges with diff output */
+       if (dense_combined_merges)
+               diff_options.output_format = DIFF_FORMAT_PATCH;
+
        if (diff_options.output_format == DIFF_FORMAT_PATCH)
                diff_options.recursive = 1;
 
        diff_tree_setup_paths(get_pathspec(prefix, argv));
+       diff_setup_done(&diff_options);
 
        switch (nr_sha1) {
        case 0:
@@ -244,7 +308,7 @@ int main(int argc, const char **argv)
                        usage(diff_tree_usage);
                break;
        case 1:
-               diff_tree_commit(sha1[0], NULL);
+               diff_tree_commit_sha1(sha1[0]);
                break;
        case 2:
                diff_tree_sha1_top(sha1[0], sha1[1], "");