Report information on branches from remote.h

This adds full parsing for branch.<name> sections and functions to
interpret the results usefully. It incidentally corrects the fetch
configuration information for legacy branches/* files with '#'
characters in the URLs.

Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/remote.c b/remote.c
index a8196b1b5dd20b119143fa22e2cdf204f1acd212..711aa04ce157e59cece118ff2a77a558e93e2df5 100644 (file)
--- a/remote.c
+++ b/remote.c
@@ -5,6 +5,12 @@
 static struct remote **remotes;
 static int allocated_remotes;
 
+static struct branch **branches;
+static int allocated_branches;
+
+static struct branch *current_branch;
+static const char *default_remote_name;
+
 #define BUF_SIZE (2048)
 static char buffer[BUF_SIZE];
 
@@ -67,6 +73,54 @@ static struct remote *make_remote(const char *name, int len)
        return remotes[empty];
 }
 
+static void add_merge(struct branch *branch, const char *name)
+{
+       int nr = branch->merge_nr + 1;
+       branch->merge_name =
+               xrealloc(branch->merge_name, nr * sizeof(char *));
+       branch->merge_name[nr-1] = name;
+       branch->merge_nr = nr;
+}
+
+static struct branch *make_branch(const char *name, int len)
+{
+       int i, empty = -1;
+       char *refname;
+
+       for (i = 0; i < allocated_branches; i++) {
+               if (!branches[i]) {
+                       if (empty < 0)
+                               empty = i;
+               } else {
+                       if (len ? (!strncmp(name, branches[i]->name, len) &&
+                                  !branches[i]->name[len]) :
+                           !strcmp(name, branches[i]->name))
+                               return branches[i];
+               }
+       }
+
+       if (empty < 0) {
+               empty = allocated_branches;
+               allocated_branches += allocated_branches ? allocated_branches : 1;
+               branches = xrealloc(branches,
+                                  sizeof(*branches) * allocated_branches);
+               memset(branches + empty, 0,
+                      (allocated_branches - empty) * sizeof(*branches));
+       }
+       branches[empty] = xcalloc(1, sizeof(struct branch));
+       if (len)
+               branches[empty]->name = xstrndup(name, len);
+       else
+               branches[empty]->name = xstrdup(name);
+       refname = malloc(strlen(name) + strlen("refs/heads/") + 1);
+       strcpy(refname, "refs/heads/");
+       strcpy(refname + strlen("refs/heads/"),
+              branches[empty]->name);
+       branches[empty]->refname = refname;
+
+       return branches[empty];
+}
+
 static void read_remotes_file(struct remote *remote)
 {
        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
@@ -116,6 +170,8 @@ static void read_remotes_file(struct remote *remote)
 static void read_branches_file(struct remote *remote)
 {
        const char *slash = strchr(remote->name, '/');
+       char *frag;
+       char *branch;
        int n = slash ? slash - remote->name : 1000;
        FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
        char *s, *p;
@@ -141,23 +197,40 @@ static void read_branches_file(struct remote *remote)
        strcpy(p, s);
        if (slash)
                strcat(p, slash);
+       frag = strchr(p, '#');
+       if (frag) {
+               *(frag++) = '\0';
+               branch = xmalloc(strlen(frag) + 12);
+               strcpy(branch, "refs/heads/");
+               strcat(branch, frag);
+       } else {
+               branch = "refs/heads/master";
+       }
        add_uri(remote, p);
+       add_fetch_refspec(remote, branch);
 }
 
-static char *default_remote_name = NULL;
-static const char *current_branch = NULL;
-static int current_branch_len = 0;
-
 static int handle_config(const char *key, const char *value)
 {
        const char *name;
        const char *subkey;
        struct remote *remote;
-       if (!prefixcmp(key, "branch.") && current_branch &&
-           !strncmp(key + 7, current_branch, current_branch_len) &&
-           !strcmp(key + 7 + current_branch_len, ".remote")) {
-               free(default_remote_name);
-               default_remote_name = xstrdup(value);
+       struct branch *branch;
+       if (!prefixcmp(key, "branch.")) {
+               name = key + 7;
+               subkey = strrchr(name, '.');
+               branch = make_branch(name, subkey - name);
+               if (!subkey)
+                       return 0;
+               if (!value)
+                       return 0;
+               if (!strcmp(subkey, ".remote")) {
+                       branch->remote_name = xstrdup(value);
+                       if (branch == current_branch)
+                               default_remote_name = branch->remote_name;
+               } else if (!strcmp(subkey, ".merge"))
+                       add_merge(branch, xstrdup(value));
+               return 0;
        }
        if (prefixcmp(key,  "remote."))
                return 0;
@@ -217,8 +290,8 @@ static void read_config(void)
        head_ref = resolve_ref("HEAD", sha1, 0, &flag);
        if (head_ref && (flag & REF_ISSYMREF) &&
            !prefixcmp(head_ref, "refs/heads/")) {
-               current_branch = head_ref + strlen("refs/heads/");
-               current_branch_len = strlen(current_branch);
+               current_branch =
+                       make_branch(head_ref + strlen("refs/heads/"), 0);
        }
        git_config(handle_config);
 }
@@ -313,6 +386,25 @@ int remote_has_uri(struct remote *remote, const char *uri)
        return 0;
 }
 
+/*
+ * Returns true if, under the matching rules for fetching, name is the
+ * same as the given full name.
+ */
+static int ref_matches_abbrev(const char *name, const char *full)
+{
+       if (!prefixcmp(name, "refs/") || !strcmp(name, "HEAD"))
+               return !strcmp(name, full);
+       if (prefixcmp(full, "refs/"))
+               return 0;
+       if (!prefixcmp(name, "heads/") ||
+           !prefixcmp(name, "tags/") ||
+           !prefixcmp(name, "remotes/"))
+               return !strcmp(name, full + 5);
+       if (prefixcmp(full + 5, "heads/"))
+               return 0;
+       return !strcmp(full + 11, name);
+}
+
 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 {
        int find_src = refspec->src == NULL;
@@ -636,3 +728,46 @@ int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
        }
        return 0;
 }
+
+struct branch *branch_get(const char *name)
+{
+       struct branch *ret;
+
+       read_config();
+       if (!name || !*name || !strcmp(name, "HEAD"))
+               ret = current_branch;
+       else
+               ret = make_branch(name, 0);
+       if (ret && ret->remote_name) {
+               ret->remote = remote_get(ret->remote_name);
+               if (ret->merge_nr) {
+                       int i;
+                       ret->merge = xcalloc(sizeof(*ret->merge),
+                                            ret->merge_nr);
+                       for (i = 0; i < ret->merge_nr; i++) {
+                               ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
+                               ret->merge[i]->src = xstrdup(ret->merge_name[i]);
+                               remote_find_tracking(ret->remote,
+                                                    ret->merge[i]);
+                       }
+               }
+       }
+       return ret;
+}
+
+int branch_has_merge_config(struct branch *branch)
+{
+       return branch && !!branch->merge;
+}
+
+int branch_merges(struct branch *branch, const char *refname)
+{
+       int i;
+       if (!branch)
+               return 0;
+       for (i = 0; i < branch->merge_nr; i++) {
+               if (ref_matches_abbrev(branch->merge[i]->src, refname))
+                       return 1;
+       }
+       return 0;
+}

diff --git a/remote.h b/remote.h
index 72c91537839e6c31d6063035da0f52af245d7d58..f21b6a6da1f85eb0818ea55ad43368a1e7cf5e33 100644 (file)
--- a/remote.h
+++ b/remote.h
@@ -49,4 +49,22 @@ int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
  */
 int remote_find_tracking(struct remote *remote, struct refspec *refspec);
 
+struct branch {
+       const char *name;
+       const char *refname;
+
+       const char *remote_name;
+       struct remote *remote;
+
+       const char **merge_name;
+       struct refspec **merge;
+       int merge_nr;
+};
+
+struct branch *branch_get(const char *name);
+
+int branch_has_merge_config(struct branch *branch);
+
+int branch_merges(struct branch *branch, const char *refname);
+
 #endif