shorten_unambiguous_ref(): add strict mode

Add the strict mode of abbreviation to shorten_unambiguous_ref(), i.e. the
resulting ref won't trigger the ambiguous ref warning.

All users of shorten_unambiguous_ref() still use the loose mode.

Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-branch.c b/builtin-branch.c
index 32758216961b9160b32315e9cb0ff9c68f9afdf9..91098ca9b106239916af000cb54a4bf09629e6b6 100644 (file)
--- a/builtin-branch.c
+++ b/builtin-branch.c
@@ -311,14 +311,14 @@ static void fill_tracking_info(struct strbuf *stat, const char *branch_name,
                if (branch && branch->merge && branch->merge[0]->dst &&
                    show_upstream_ref)
                        strbuf_addf(stat, "[%s] ",
-                           shorten_unambiguous_ref(branch->merge[0]->dst));
+                           shorten_unambiguous_ref(branch->merge[0]->dst, 0));
                return;
        }
 
        strbuf_addch(stat, '[');
        if (show_upstream_ref)
                strbuf_addf(stat, "%s: ",
-                       shorten_unambiguous_ref(branch->merge[0]->dst));
+                       shorten_unambiguous_ref(branch->merge[0]->dst, 0));
        if (!ours)
                strbuf_addf(stat, "behind %d] ", theirs);
        else if (!theirs)

diff --git a/builtin-for-each-ref.c b/builtin-for-each-ref.c
index c8114c8afdb5e5d8a5f0adac2302aa97c384d232..cfff686ac8e151c9624788e27dda9cda268e41e8 100644 (file)
--- a/builtin-for-each-ref.c
+++ b/builtin-for-each-ref.c
@@ -601,7 +601,7 @@ static void populate_value(struct refinfo *ref)
                if (formatp) {
                        formatp++;
                        if (!strcmp(formatp, "short"))
-                               refname = shorten_unambiguous_ref(refname);
+                               refname = shorten_unambiguous_ref(refname, 0);
                        else
                                die("unknown %.*s format %s",
                                    (int)(formatp - name), name, formatp);

diff --git a/refs.c b/refs.c
index 82afb8768473f605bdbce17698b219484890f4f9..e65a3b4c4ef57863a1055108d2598777cabc2c8d 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -1681,7 +1681,7 @@ static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
        return;
 }
 
-char *shorten_unambiguous_ref(const char *ref)
+char *shorten_unambiguous_ref(const char *ref, int strict)
 {
        int i;
        static char **scanf_fmts;
@@ -1718,6 +1718,7 @@ char *shorten_unambiguous_ref(const char *ref)
        /* skip first rule, it will always match */
        for (i = nr_rules - 1; i > 0 ; --i) {
                int j;
+               int rules_to_fail = i;
                int short_name_len;
 
                if (1 != sscanf(ref, scanf_fmts[i], short_name))
@@ -1725,15 +1726,26 @@ char *shorten_unambiguous_ref(const char *ref)
 
                short_name_len = strlen(short_name);
 
+               /*
+                * in strict mode, all (except the matched one) rules
+                * must fail to resolve to a valid non-ambiguous ref
+                */
+               if (strict)
+                       rules_to_fail = nr_rules;
+
                /*
                 * check if the short name resolves to a valid ref,
                 * but use only rules prior to the matched one
                 */
-               for (j = 0; j < i; j++) {
+               for (j = 0; j < rules_to_fail; j++) {
                        const char *rule = ref_rev_parse_rules[j];
                        unsigned char short_objectname[20];
                        char refname[PATH_MAX];
 
+                       /* skip matched rule */
+                       if (i == j)
+                               continue;
+
                        /*
                         * the short name is ambiguous, if it resolves
                         * (with this previous rule) to a valid ref
@@ -1749,7 +1761,7 @@ char *shorten_unambiguous_ref(const char *ref)
                 * short name is non-ambiguous if all previous rules
                 * haven't resolved to a valid ref
                 */
-               if (j == i)
+               if (j == rules_to_fail)
                        return short_name;
        }
 

diff --git a/refs.h b/refs.h
index 50abbbb2aafb5c6a514d3704001f60473b8b1bfa..29d17a48e4a2923bc72337deb1ef64cf7b467381 100644 (file)
--- a/refs.h
+++ b/refs.h
@@ -81,7 +81,7 @@ extern int for_each_reflog(each_ref_fn, void *);
 extern int check_ref_format(const char *target);
 
 extern const char *prettify_ref(const struct ref *ref);
-extern char *shorten_unambiguous_ref(const char *ref);
+extern char *shorten_unambiguous_ref(const char *ref, int strict);
 
 /** rename ref, return 0 on success **/
 extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);