Teach the "@{-1} syntax to "git branch"
[gitweb.git] / builtin-branch.c
index 4b4abfd3639d2c6a1405e2e056ed5362b4b73abb..504a981ad56f73a547c11bf3e18185f67111d000 100644 (file)
@@ -97,9 +97,9 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
        unsigned char sha1[20];
        char *name = NULL;
        const char *fmt, *remote;
-       char section[PATH_MAX];
        int i;
        int ret = 0;
+       struct strbuf bname = STRBUF_INIT;
 
        switch (kinds) {
        case REF_REMOTE_BRANCH:
@@ -120,20 +120,25 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
                if (!head_rev)
                        die("Couldn't look up commit object for HEAD");
        }
-       for (i = 0; i < argc; i++) {
-               if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
+       for (i = 0; i < argc; i++, strbuf_release(&bname)) {
+               int len = strlen(argv[i]);
+
+               if (interpret_nth_last_branch(argv[i], &bname) != len)
+                       strbuf_add(&bname, argv[i], len);
+
+               if (kinds == REF_LOCAL_BRANCH && !strcmp(head, bname.buf)) {
                        error("Cannot delete the branch '%s' "
-                               "which you are currently on.", argv[i]);
+                             "which you are currently on.", bname.buf);
                        ret = 1;
                        continue;
                }
 
                free(name);
 
-               name = xstrdup(mkpath(fmt, argv[i]));
+               name = xstrdup(mkpath(fmt, bname.buf));
                if (!resolve_ref(name, sha1, 1, NULL)) {
                        error("%sbranch '%s' not found.",
-                                       remote, argv[i]);
+                                       remote, bname.buf);
                        ret = 1;
                        continue;
                }
@@ -153,23 +158,26 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
                if (!force &&
                    !in_merge_bases(rev, &head_rev, 1)) {
                        error("The branch '%s' is not an ancestor of "
-                               "your current HEAD.\n"
-                               "If you are sure you want to delete it, "
-                               "run 'git branch -D %s'.", argv[i], argv[i]);
+                             "your current HEAD.\n"
+                             "If you are sure you want to delete it, "
+                             "run 'git branch -D %s'.", bname.buf, bname.buf);
                        ret = 1;
                        continue;
                }
 
                if (delete_ref(name, sha1, 0)) {
                        error("Error deleting %sbranch '%s'", remote,
-                              argv[i]);
+                             bname.buf);
                        ret = 1;
                } else {
-                       printf("Deleted %sbranch %s.\n", remote, argv[i]);
-                       snprintf(section, sizeof(section), "branch.%s",
-                                argv[i]);
-                       if (git_config_rename_section(section, NULL) < 0)
+                       struct strbuf buf = STRBUF_INIT;
+                       printf("Deleted %sbranch %s (%s).\n", remote,
+                              bname.buf,
+                              find_unique_abbrev(sha1, DEFAULT_ABBREV));
+                       strbuf_addf(&buf, "branch.%s", bname.buf);
+                       if (git_config_rename_section(buf.buf, NULL) < 0)
                                warning("Update of config-file failed");
+                       strbuf_release(&buf);
                }
        }
 
@@ -192,21 +200,6 @@ struct ref_list {
        int kinds;
 };
 
-static int has_commit(struct commit *commit, struct commit_list *with_commit)
-{
-       if (!with_commit)
-               return 1;
-       while (with_commit) {
-               struct commit *other;
-
-               other = with_commit->item;
-               with_commit = with_commit->next;
-               if (in_merge_bases(other, &commit, 1))
-                       return 1;
-       }
-       return 0;
-}
-
 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 {
        struct ref_list *ref_list = (struct ref_list*)(cb_data);
@@ -230,7 +223,7 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
                return error("branch '%s' does not point at a commit", refname);
 
        /* Filter with with_commit if specified */
-       if (!has_commit(commit, ref_list->with_commit))
+       if (!is_descendant_of(commit, ref_list->with_commit))
                return 0;
 
        /* Don't add types the caller doesn't want */
@@ -279,7 +272,7 @@ static int ref_cmp(const void *r1, const void *r2)
        return strcmp(c1->name, c2->name);
 }
 
-static void fill_tracking_info(char *stat, const char *branch_name)
+static void fill_tracking_info(struct strbuf *stat, const char *branch_name)
 {
        int ours, theirs;
        struct branch *branch = branch_get(branch_name);
@@ -287,11 +280,11 @@ static void fill_tracking_info(char *stat, const char *branch_name)
        if (!stat_tracking_info(branch, &ours, &theirs) || (!ours && !theirs))
                return;
        if (!ours)
-               sprintf(stat, "[behind %d] ", theirs);
+               strbuf_addf(stat, "[behind %d] ", theirs);
        else if (!theirs)
-               sprintf(stat, "[ahead %d] ", ours);
+               strbuf_addf(stat, "[ahead %d] ", ours);
        else
-               sprintf(stat, "[ahead %d, behind %d] ", ours, theirs);
+               strbuf_addf(stat, "[ahead %d, behind %d] ", ours, theirs);
 }
 
 static int matches_merge_filter(struct commit *commit)
@@ -334,12 +327,8 @@ static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
        }
 
        if (verbose) {
-               struct strbuf subject;
+               struct strbuf subject = STRBUF_INIT, stat = STRBUF_INIT;
                const char *sub = " **** invalid ref ****";
-               char stat[128];
-
-               strbuf_init(&subject, 0);
-               stat[0] = '\0';
 
                commit = item->commit;
                if (commit && !parse_commit(commit)) {
@@ -349,13 +338,14 @@ static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
                }
 
                if (item->kind == REF_LOCAL_BRANCH)
-                       fill_tracking_info(stat, item->name);
+                       fill_tracking_info(&stat, item->name);
 
                printf("%c %s%-*s%s %s %s%s\n", c, branch_get_color(color),
                       maxwidth, item->name,
                       branch_get_color(COLOR_BRANCH_RESET),
                       find_unique_abbrev(item->commit->object.sha1, abbrev),
-                      stat, sub);
+                      stat.buf, sub);
+               strbuf_release(&stat);
                strbuf_release(&subject);
        } else {
                printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
@@ -403,7 +393,8 @@ static void print_ref_list(int kinds, int detached, int verbose, int abbrev, str
        qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 
        detached = (detached && (kinds & REF_LOCAL_BRANCH));
-       if (detached && head_commit && has_commit(head_commit, with_commit)) {
+       if (detached && head_commit &&
+           is_descendant_of(head_commit, with_commit)) {
                struct ref_item item;
                item.name = xstrdup("(no branch)");
                item.kind = REF_LOCAL_BRANCH;
@@ -427,58 +418,45 @@ static void print_ref_list(int kinds, int detached, int verbose, int abbrev, str
 
 static void rename_branch(const char *oldname, const char *newname, int force)
 {
-       char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
+       struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT;
        unsigned char sha1[20];
-       char oldsection[PATH_MAX], newsection[PATH_MAX];
+       struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT;
 
        if (!oldname)
                die("cannot rename the current branch while not on any.");
 
-       if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
-               die("Old branchname too long");
+       strbuf_addf(&oldref, "refs/heads/%s", oldname);
 
-       if (check_ref_format(oldref))
-               die("Invalid branch name: %s", oldref);
+       if (check_ref_format(oldref.buf))
+               die("Invalid branch name: %s", oldref.buf);
 
-       if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
-               die("New branchname too long");
+       strbuf_addf(&newref, "refs/heads/%s", newname);
 
-       if (check_ref_format(newref))
-               die("Invalid branch name: %s", newref);
+       if (check_ref_format(newref.buf))
+               die("Invalid branch name: %s", newref.buf);
 
-       if (resolve_ref(newref, sha1, 1, NULL) && !force)
+       if (resolve_ref(newref.buf, sha1, 1, NULL) && !force)
                die("A branch named '%s' already exists.", newname);
 
-       snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
-                oldref, newref);
+       strbuf_addf(&logmsg, "Branch: renamed %s to %s",
+                oldref.buf, newref.buf);
 
-       if (rename_ref(oldref, newref, logmsg))
+       if (rename_ref(oldref.buf, newref.buf, logmsg.buf))
                die("Branch rename failed");
+       strbuf_release(&logmsg);
 
        /* no need to pass logmsg here as HEAD didn't really move */
-       if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
+       if (!strcmp(oldname, head) && create_symref("HEAD", newref.buf, NULL))
                die("Branch renamed to %s, but HEAD is not updated!", newname);
 
-       snprintf(oldsection, sizeof(oldsection), "branch.%s", oldref + 11);
-       snprintf(newsection, sizeof(newsection), "branch.%s", newref + 11);
-       if (git_config_rename_section(oldsection, newsection) < 0)
+       strbuf_addf(&oldsection, "branch.%s", oldref.buf + 11);
+       strbuf_release(&oldref);
+       strbuf_addf(&newsection, "branch.%s", newref.buf + 11);
+       strbuf_release(&newref);
+       if (git_config_rename_section(oldsection.buf, newsection.buf) < 0)
                die("Branch is renamed, but update of config-file failed");
-}
-
-static int opt_parse_with_commit(const struct option *opt, const char *arg, int unset)
-{
-       unsigned char sha1[20];
-       struct commit *commit;
-
-       if (!arg)
-               return -1;
-       if (get_sha1(arg, sha1))
-               die("malformed object name %s", arg);
-       commit = lookup_commit_reference(sha1);
-       if (!commit)
-               die("no such commit %s", arg);
-       commit_list_insert(commit, opt->value);
-       return 0;
+       strbuf_release(&oldsection);
+       strbuf_release(&newsection);
 }
 
 static int opt_parse_merge_filter(const struct option *opt, const char *arg, int unset)
@@ -516,13 +494,13 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                        OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
                        "print only branches that contain the commit",
                        PARSE_OPT_LASTARG_DEFAULT,
-                       opt_parse_with_commit, (intptr_t)"HEAD",
+                       parse_opt_with_commit, (intptr_t)"HEAD",
                },
                {
                        OPTION_CALLBACK, 0, "with", &with_commit, "commit",
                        "print only branches that contain the commit",
                        PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
-                       opt_parse_with_commit, (intptr_t) "HEAD",
+                       parse_opt_with_commit, (intptr_t) "HEAD",
                },
                OPT__ABBREV(&abbrev),