So HEAD@{0}~0^0 is too much to type, but we can remove '^0', and we can
remove '~0', and we can remove 'HEAD', which leaves us with @{0}, but we
can't remove '{0}'?

This patch allows '@' to be the same as 'HEAD'.

So now we can use 'git show @~1', and all that goody goodness.

Until now '@' was a valid name, but it conflicts with this idea, so lets
make it invalid. Probably very few people, if any, used this name.

Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---

Drop the last two patches of the previous series, and replace with this one,
which is the real deal ;)

 Documentation/git-check-ref-format.txt |  2 ++
 Documentation/revisions.txt            |  3 +++
 refs.c                                 |  4 ++++
 sha1_name.c                            | 17 +++++++++++++++++
 t/t1508-at-combinations.sh             |  3 +++
 5 files changed, 29 insertions(+)

diff --git a/Documentation/git-check-ref-format.txt 
b/Documentation/git-check-ref-format.txt
index ec1739a..e8035ec 100644
--- a/Documentation/git-check-ref-format.txt
+++ b/Documentation/git-check-ref-format.txt
@@ -54,6 +54,8 @@ Git imposes the following rules on how references are named:
 
 . They cannot contain a sequence `@{`.
 
+. They cannot be the single character `@`.
+
 . They cannot contain a `\`.
 
 These rules make it easy for shell script based tools to parse
diff --git a/Documentation/revisions.txt b/Documentation/revisions.txt
index d477b3f..09896a3 100644
--- a/Documentation/revisions.txt
+++ b/Documentation/revisions.txt
@@ -58,6 +58,9 @@ the '$GIT_DIR/refs' directory or from the 
'$GIT_DIR/packed-refs' file.
 While the ref name encoding is unspecified, UTF-8 is preferred as
 some output processing may assume ref names in UTF-8.
 
+'@'::
+  '@' alone is a shortcut for 'HEAD'.
+
 '<refname>@\{<date>\}', e.g. 'master@\{yesterday\}', 'HEAD@\{5 minutes ago\}'::
   A ref followed by the suffix '@' with a date specification
   enclosed in a brace
diff --git a/refs.c b/refs.c
index de2d8eb..4e70b3e 100644
--- a/refs.c
+++ b/refs.c
@@ -72,6 +72,10 @@ int check_refname_format(const char *refname, int flags)
 {
        int component_len, component_count = 0;
 
+       if (!strcmp(refname, "@"))
+               /* Refname is a single character '@'. */
+               return -1;
+
        while (1) {
                /* We are at the start of a path component. */
                component_len = check_refname_component(refname, flags);
diff --git a/sha1_name.c b/sha1_name.c
index 76e3219..3b06e5e 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -965,6 +965,17 @@ int get_sha1_mb(const char *name, unsigned char *sha1)
        return st;
 }
 
+/* parse @something syntax, when 'something' is not {.*} */
+static int interpret_empty_at(const char *name, int namelen, int len, struct 
strbuf *buf)
+{
+       if (len || name[1] == '{')
+               return -1;
+
+       strbuf_reset(buf);
+       strbuf_add(buf, "HEAD", 4);
+       return 1;
+}
+
 static int reinterpret(const char *name, int namelen, int len, struct strbuf 
*buf)
 {
        /* we have extra data, which might need further processing */
@@ -1025,9 +1036,15 @@ int interpret_branch_name(const char *name, struct 
strbuf *buf)
        cp = strchr(name, '@');
        if (!cp)
                return -1;
+
+       len = interpret_empty_at(name, namelen, cp - name, buf);
+       if (len > 0)
+               return reinterpret(name, namelen, len, buf);
+
        tmp_len = upstream_mark(cp, namelen - (cp - name));
        if (!tmp_len)
                return -1;
+
        len = cp + tmp_len - name;
        cp = xstrndup(name, cp - name);
        upstream = branch_get(*cp ? cp : NULL);
diff --git a/t/t1508-at-combinations.sh b/t/t1508-at-combinations.sh
index d5d6244..65584c0 100755
--- a/t/t1508-at-combinations.sh
+++ b/t/t1508-at-combinations.sh
@@ -45,6 +45,9 @@ check "@{u}" upstream-two
 check "@{u}@{1}" upstream-one
 check "@{-1}@{u}" master-two
 check "@{-1}@{u}@{1}" master-one
+check "@" new-two
+check "HEAD@{u}" upstream-two
+check "@@{u}" upstream-two
 nonsense "@{u}@{-1}"
 nonsense "@{1}@{u}"
 
-- 
1.8.3.rc0.399.gc96a135

--
To unsubscribe from this list: send the line "unsubscribe git" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to