parse_pathspec: accept :(icase)path syntax

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 48 insertions, 11 deletions

diff --git a/tree-walk.c b/tree-walk.c
index a44f528b3b..c366852553 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -489,13 +489,25 @@ int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned ch
 	return retval;
 }
 
-static int match_entry(const struct name_entry *entry, int pathlen,
+static int match_entry(const struct pathspec_item *item,
+		       const struct name_entry *entry, int pathlen,
 		       const char *match, int matchlen,
 		       enum interesting *never_interesting)
 {
 	int m = -1; /* signals that we haven't called strncmp() */
 
-	if (*never_interesting != entry_not_interesting) {
+	if (item->magic & PATHSPEC_ICASE)
+		/*
+		 * "Never interesting" trick requires exact
+		 * matching. We could do something clever with inexact
+		 * matching, but it's trickier (and not to forget that
+		 * strcasecmp is locale-dependent, at least in
+		 * glibc). Just disable it for now. It can't be worse
+		 * than the wildcard's codepath of '[Tt][Hi][Is][Ss]'
+		 * pattern.
+		 */
+		*never_interesting = entry_not_interesting;
+	else if (*never_interesting != entry_not_interesting) {
 		/*
 		 * We have not seen any match that sorts later
 		 * than the current path.
@@ -541,7 +553,7 @@ static int match_entry(const struct name_entry *entry, int pathlen,
 		 * we cheated and did not do strncmp(), so we do
 		 * that here.
 		 */
-		m = strncmp(match, entry->path, pathlen);
+		m = ps_strncmp(item, match, entry->path, pathlen);
 
 	/*
 	 * If common part matched earlier then it is a hit,
@@ -549,15 +561,39 @@ static int match_entry(const struct name_entry *entry, int pathlen,
 	 * leading directory and is shorter than match.
 	 */
 	if (!m)
+		/*
+		 * match_entry does not check if the prefix part is
+		 * matched case-sensitively. If the entry is a
+		 * directory and part of prefix, it'll be rematched
+		 * eventually by basecmp with special treatment for
+		 * the prefix.
+		 */
 		return 1;
 
 	return 0;
 }
 
-static int match_dir_prefix(const char *base,
+/* :(icase)-aware string compare */
+static int basecmp(const struct pathspec_item *item,
+		   const char *base, const char *match, int len)
+{
+	if (item->magic & PATHSPEC_ICASE) {
+		int ret, n = len > item->prefix ? item->prefix : len;
+		ret = strncmp(base, match, n);
+		if (ret)
+			return ret;
+		base += n;
+		match += n;
+		len -= n;
+	}
+	return ps_strncmp(item, base, match, len);
+}
+
+static int match_dir_prefix(const struct pathspec_item *item,
+			    const char *base,
 			    const char *match, int matchlen)
 {
-	if (strncmp(base, match, matchlen))
+	if (basecmp(item, base, match, matchlen))
 		return 0;
 
 	/*
@@ -594,7 +630,7 @@ static int match_wildcard_base(const struct pathspec_item *item,
 		 */
 		if (baselen >= matchlen) {
 			*matched = matchlen;
-			return !strncmp(base, match, matchlen);
+			return !basecmp(item, base, match, matchlen);
 		}
 
 		dirlen = matchlen;
@@ -607,7 +643,7 @@ static int match_wildcard_base(const struct pathspec_item *item,
 		 * base ends with '/' so we are sure it really matches
 		 * directory
 		 */
-		if (strncmp(base, match, baselen))
+		if (basecmp(item, base, match, baselen))
 			return 0;
 		*matched = baselen;
 	} else
@@ -640,7 +676,8 @@ enum interesting tree_entry_interesting(const struct name_entry *entry,
 		       PATHSPEC_FROMTOP |
 		       PATHSPEC_MAXDEPTH |
 		       PATHSPEC_LITERAL |
-		       PATHSPEC_GLOB);
+		       PATHSPEC_GLOB |
+		       PATHSPEC_ICASE);
 
 	if (!ps->nr) {
 		if (!ps->recursive ||
@@ -663,7 +700,7 @@ enum interesting tree_entry_interesting(const struct name_entry *entry,
 
 		if (baselen >= matchlen) {
 			/* If it doesn't match, move along... */
-			if (!match_dir_prefix(base_str, match, matchlen))
+			if (!match_dir_prefix(item, base_str, match, matchlen))
 				goto match_wildcards;
 
 			if (!ps->recursive ||
@@ -679,8 +716,8 @@ enum interesting tree_entry_interesting(const struct name_entry *entry,
 		}
 
 		/* Either there must be no base, or the base must match. */
-		if (baselen == 0 || !strncmp(base_str, match, baselen)) {
-			if (match_entry(entry, pathlen,
+		if (baselen == 0 || !basecmp(item, base_str, match, baselen)) {
+			if (match_entry(item, entry, pathlen,
 					match + baselen, matchlen - baselen,
 					&never_interesting))
 				return entry_interesting;