Merge branch 'nd/negative-pathspec'

Introduce "negative pathspec" magic, to allow "git log -- . ':!dir'" to
tell us "I am interested in everything but 'dir' directory".

* nd/negative-pathspec:
  pathspec.c: support adding prefix magic to a pathspec with mnemonic magic
  Support pathspec magic :(exclude) and its short form :!
  glossary-content.txt: rephrase magic signature part

1 files changed, 26 insertions, 11 deletions

diff --git a/pathspec.c b/pathspec.c
index 52d38a4b4..6cb9fd301 100644
--- a/pathspec.c
+++ b/pathspec.c
@@ -71,8 +71,23 @@ static struct pathspec_magic {
 	{ PATHSPEC_LITERAL,   0, "literal" },
 	{ PATHSPEC_GLOB,   '\0', "glob" },
 	{ PATHSPEC_ICASE,  '\0', "icase" },
+	{ PATHSPEC_EXCLUDE, '!', "exclude" },
 };
 
+static void prefix_short_magic(struct strbuf *sb, int prefixlen,
+			       unsigned short_magic)
+{
+	int i;
+	strbuf_addstr(sb, ":(");
+	for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
+		if (short_magic & pathspec_magic[i].bit) {
+			if (sb->buf[sb->len - 1] != '(')
+				strbuf_addch(sb, ',');
+			strbuf_addstr(sb, pathspec_magic[i].name);
+		}
+	strbuf_addf(sb, ",prefix:%d)", prefixlen);
+}
+
 /*
  * Take an element of a pathspec and check for magic signatures.
  * Append the result to the prefix. Return the magic bitmap.
@@ -232,22 +247,16 @@ static unsigned prefix_pathspec(struct pathspec_item *item,
 	 */
 	if (flags & PATHSPEC_PREFIX_ORIGIN) {
 		struct strbuf sb = STRBUF_INIT;
-		const char *start = elt;
 		if (prefixlen && !literal_global) {
 			/* Preserve the actual prefix length of each pattern */
 			if (short_magic)
-				die("BUG: prefixing on short magic is not supported");
+				prefix_short_magic(&sb, prefixlen, short_magic);
 			else if (long_magic_end) {
-				strbuf_add(&sb, start, long_magic_end - start);
-				strbuf_addf(&sb, ",prefix:%d", prefixlen);
-				start = long_magic_end;
-			} else {
-				if (*start == ':')
-					start++;
+				strbuf_add(&sb, elt, long_magic_end - elt);
+				strbuf_addf(&sb, ",prefix:%d)", prefixlen);
+			} else
 				strbuf_addf(&sb, ":(prefix:%d)", prefixlen);
-			}
 		}
-		strbuf_add(&sb, start, copyfrom - start);
 		strbuf_addstr(&sb, match);
 		item->original = strbuf_detach(&sb, NULL);
 	} else
@@ -355,7 +364,7 @@ void parse_pathspec(struct pathspec *pathspec,
 {
 	struct pathspec_item *item;
 	const char *entry = argv ? *argv : NULL;
-	int i, n, prefixlen;
+	int i, n, prefixlen, nr_exclude = 0;
 
 	memset(pathspec, 0, sizeof(*pathspec));
 
@@ -412,6 +421,8 @@ void parse_pathspec(struct pathspec *pathspec,
 		if ((flags & PATHSPEC_LITERAL_PATH) &&
 		    !(magic_mask & PATHSPEC_LITERAL))
 			item[i].magic |= PATHSPEC_LITERAL;
+		if (item[i].magic & PATHSPEC_EXCLUDE)
+			nr_exclude++;
 		if (item[i].magic & magic_mask)
 			unsupported_magic(entry,
 					  item[i].magic & magic_mask,
@@ -427,6 +438,10 @@ 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 (pathspec->magic & PATHSPEC_MAXDEPTH) {
 		if (flags & PATHSPEC_KEEP_ORDER)