Typing 'HEAD' is tedious, especially when we can use '@' instead.
The reason for choosing '@' is that it follows naturally from the
ref@op syntax (e.g. HEAD@{u}), except we have no ref, and no
operation, and when we don't have those, it makes sens to assume
'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
let's make it invalid. Probably very few people, if any, used this name.
Signed-off-by: Felipe Contreras <felipe.contreras@xxxxxxxxx>
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
Documentation/git-check-ref-format.txt | 2 ++
Documentation/revisions.txt | 3 +++
refs.c | 4 ++++
sha1_name.c | 26 ++++++++++++++++++++++++++
t/t1508-at-combinations.sh | 4 ++++
5 files changed, 39 insertions(+)
diff --git a/Documentation/git-check-ref-format.txt b/Documentation/git-check-ref-format.txt
index a49be1b..fc02959 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 8fd5faf..bfe10e2 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 93197b9..b8ece6e 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -1004,6 +1004,26 @@ 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)
+{
+ const char *next;
+
+ if (len || name[1] == '{')
+ return -1;
+
+ /* make sure it's a single @, or @@{.*}, not @foo */
+ next = strchr(name + len + 1, '@');
+ if (!next)
+ next = name + namelen;
+ if (next != 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 */
@@ -1068,9 +1088,15 @@ int interpret_branch_name(const char *name, int namelen, 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 e5aea3b..3a52375 100755
--- a/t/t1508-at-combinations.sh
+++ b/t/t1508-at-combinations.sh
@@ -32,6 +32,7 @@ test_expect_success 'setup' '
git checkout -b upstream-branch &&
test_commit upstream-one &&
test_commit upstream-two &&
+ git checkout -b @at-test &&
git checkout -b old-branch &&
test_commit old-one &&
test_commit old-two &&
@@ -55,6 +56,9 @@ check "HEAD@{u}" ref refs/heads/upstream-branch
check "@{u}@{1}" commit upstream-one
check "@{-1}@{u}" ref refs/heads/master
check "@{-1}@{u}@{1}" commit master-one
+check "@" commit new-two
+check "@@{u}" ref refs/heads/upstream-branch
+check "@at-test" ref refs/heads/@at-test
nonsense "@{u}@{-1}"
nonsense "@{0}@{0}"
nonsense "@{1}@{u}"
--
1.8.4-338-gefd7fa6
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