pathspec: don't error out on all-exclusionary pathspec patterns

Instead of erroring out and telling the user that they should add a
positive pattern that covers everything else, just _do_ that.

For commands where we honor the current cwd by default (ie grep, ls-files
etc), we make that default positive pathspec be the current working
directory.  And for commands that default to the whole project (ie diff,
log, etc), the default positive pathspec is the whole project.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/glossary-content.txt b/Documentation/glossary-content.txt
index 822ca832640fe0142e364e99468715d45d2e1fc5..fc9320e59ecac99fc4d3f6234c74f89aab4dd45b 100644 (file)
--- a/Documentation/glossary-content.txt
+++ b/Documentation/glossary-content.txt
@@ -387,7 +387,9 @@ Glob magic is incompatible with literal magic.
 exclude;;
        After a path matches any non-exclude pathspec, it will be run
        through all exclude pathspec (magic signature: `!` or its
-       synonym `^`). If it matches, the path is ignored.
+       synonym `^`). If it matches, the path is ignored.  When there
+       is no non-exclude pathspec, the exclusion is applied to the
+       result set as if invoked without any pathspec.
 --
 
 [[def_parent]]parent::

diff --git a/pathspec.c b/pathspec.c
index ecad03406397338961fa0cb065b7ca18889d86ef..b961f00c8cd0eb68c56b33aa829579e8609edba6 100644 (file)
--- a/pathspec.c
+++ b/pathspec.c
@@ -522,7 +522,7 @@ void parse_pathspec(struct pathspec *pathspec,
        }
 
        pathspec->nr = n;
-       ALLOC_ARRAY(pathspec->items, n);
+       ALLOC_ARRAY(pathspec->items, n + 1);
        item = pathspec->items;
        prefixlen = prefix ? strlen(prefix) : 0;
 
@@ -546,10 +546,15 @@ void parse_pathspec(struct pathspec *pathspec,
                pathspec->magic |= item[i].magic;
        }
 
-       if (nr_exclude == n)
-               die(_("There is nothing to exclude from by :(exclude) patterns.\n"
-                     "Perhaps you forgot to add either ':/' or '.' ?"));
-
+       /*
+        * If everything is an exclude pattern, add one positive pattern
+        * that matches everyting. We allocated an extra one for this.
+        */
+       if (nr_exclude == n) {
+               int plen = (!(flags & PATHSPEC_PREFER_CWD)) ? 0 : prefixlen;
+               init_pathspec_item(item + n, 0, prefix, plen, "");
+               pathspec->nr++;
+       }
 
        if (pathspec->magic & PATHSPEC_MAXDEPTH) {
                if (flags & PATHSPEC_KEEP_ORDER)

diff --git a/t/t6132-pathspec-exclude.sh b/t/t6132-pathspec-exclude.sh
index d51595cf6b189a59d271dcc69c3f245b72dcb8f6..9dd5cde5fc53deb365234e815d7142de9a975005 100755 (executable)
--- a/t/t6132-pathspec-exclude.sh
+++ b/t/t6132-pathspec-exclude.sh
@@ -25,8 +25,10 @@ EOF
        test_cmp expect actual
 '
 
-test_expect_success 'exclude only should error out' '
-       test_must_fail git log --oneline --format=%s -- ":(exclude)sub"
+test_expect_success 'exclude only no longer errors out' '
+       git log --oneline --format=%s -- . ":(exclude)sub" >expect &&
+       git log --oneline --format=%s -- ":(exclude)sub" >actual &&
+       test_cmp expect actual
 '
 
 test_expect_success 't_e_i() exclude sub' '