Revert "Add new @ shortcut for HEAD"

This reverts commit cdfd94837b27c220f70f032b596ea993d195488f, as it does not just apply to "@" (and forms with modifiers like @{u} applied to it), but also affects e.g. "refs/heads/@/foo", which it shouldn't. The basic idea of giving a short-hand might be good, and the topic can be retried later, but let's revert to avoid affecting existing use cases for now for the upcoming release.

Junio C Hamano committed Aug 14, 2013 at 10:57 UTC 2c2b6646c2723459dbd334c7ced6f77ffb0d596e
5 files changed -28
Documentation/git-check-ref-format.txt
-2
@@ -54,8 +54,6 @@ Git imposes the following rules on how references are named:
54
55 . They cannot contain a sequence `@{`.
56
57 -. They cannot be the single character `@`.
58 -
57 . They cannot contain a `\`.
58
59 These rules make it easy for shell script based tools to parse
Documentation/revisions.txt
-3
@@ -58,9 +58,6 @@ the '$GIT_DIR/refs' directory or from the '$GIT_DIR/packed-refs' file.
58 While the ref name encoding is unspecified, UTF-8 is preferred as
59 some output processing may assume ref names in UTF-8.
60
61 -'@'::
62 - '@' alone is a shortcut for 'HEAD'.
63 -
61 '<refname>@\{<date>\}', e.g. 'master@\{yesterday\}', 'HEAD@\{5 minutes ago\}'::
62 A ref followed by the suffix '@' with a date specification
63 enclosed in a brace
refs.c
-4
@@ -72,10 +72,6 @@ int check_refname_format(const char *refname, int flags)
72 {
73 int component_len, component_count = 0;
74
75 - if (!strcmp(refname, "@"))
76 - /* Refname is a single character '@'. */
77 - return -1;
78 -
75 while (1) {
76 /* We are at the start of a path component. */
77 component_len = check_refname_component(refname, flags);
sha1_name.c
-17
@@ -1004,17 +1004,6 @@ int get_sha1_mb(const char *name, unsigned char *sha1)
1004 return st;
1005 }
1006
1007 -/* parse @something syntax, when 'something' is not {.*} */
1008 -static int interpret_empty_at(const char *name, int namelen, int len, struct strbuf *buf)
1009 -{
1010 - if (len || name[1] == '{')
1011 - return -1;
1012 -
1013 - strbuf_reset(buf);
1014 - strbuf_add(buf, "HEAD", 4);
1015 - return 1;
1016 -}
1017 -
1007 static int reinterpret(const char *name, int namelen, int len, struct strbuf *buf)
1008 {
1009 /* we have extra data, which might need further processing */
@@ -1077,15 +1066,9 @@ int interpret_branch_name(const char *name, struct strbuf *buf)
1066 cp = strchr(name, '@');
1067 if (!cp)
1068 return -1;
1080 -
1081 - len = interpret_empty_at(name, namelen, cp - name, buf);
1082 - if (len > 0)
1083 - return reinterpret(name, namelen, len, buf);
1084 -
1069 tmp_len = upstream_mark(cp, namelen - (cp - name));
1070 if (!tmp_len)
1071 return -1;
1088 -
1072 len = cp + tmp_len - name;
1073 cp = xstrndup(name, cp - name);
1074 upstream = branch_get(*cp ? cp : NULL);
t/t1508-at-combinations.sh
-2
@@ -55,8 +55,6 @@ check "HEAD@{u}" ref refs/heads/upstream-branch
55 check "@{u}@{1}" commit upstream-one
56 check "@{-1}@{u}" ref refs/heads/master
57 check "@{-1}@{u}@{1}" commit master-one
58 -check "@" commit new-two
59 -check "@@{u}" ref refs/heads/upstream-branch
58 nonsense "@{u}@{-1}"
59 nonsense "@{0}@{0}"
60 nonsense "@{1}@{u}"