git-p4: don't exclude other files with same prefix

Make sure not to exclude files unintentionally
if exclude paths are specified without a trailing /.
I.e., don't exclude "//depot/file_dont_exclude" if run with "-//depot/file".

Do this by ensuring that paths without a trailing "/" are only matched completely.

Also, abort path search on the first match as a micro-optimization.

Signed-off-by: Andrey Mazo <amazo@checkvideo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: Mazo, Andrey

git-p4.py

@@ -2623,18 +2623,25 @@ def checkpoint(self):
         if self.verbose:
             print("checkpoint finished: " + out)
 
+    def isPathWanted(self, path):
+        for p in self.cloneExclude:
+            if p.endswith("/"):
+                if p4PathStartsWith(path, p):
+                    return False
+            # "-//depot/file1" without a trailing "/" should only exclude "file1", but not "file111" or "file1_dir/file2"
+            elif path.lower() == p.lower():
+                return False
+        for p in self.depotPaths:
+            if p4PathStartsWith(path, p):
+                return True
+        return False
+
     def extractFilesFromCommit(self, commit, shelved=False, shelved_cl = 0):
         files = []
         fnum = 0
         while "depotFile%s" % fnum in commit:
             path =  commit["depotFile%s" % fnum]
-
-            if [p for p in self.cloneExclude
-                if p4PathStartsWith(path, p)]:
-                found = False
-            else:
-                found = [p for p in self.depotPaths
-                         if p4PathStartsWith(path, p)]
+            found = self.isPathWanted(path)
             if not found:
                 fnum = fnum + 1
                 continue

t/t9817-git-p4-exclude.sh

@@ -53,7 +53,7 @@ test_expect_success 'clone, excluding part of repo' '
 	)
 '
 
-test_expect_failure 'clone, excluding single file, no trailing /' '
+test_expect_success 'clone, excluding single file, no trailing /' '
 	test_when_finished cleanup_git &&
 	git p4 clone -//depot/discard_file --dest="$git" //depot/...@all &&
 	(
@@ -85,7 +85,7 @@ test_expect_success 'clone, then sync with exclude' '
 	)
 '
 
-test_expect_failure 'clone, then sync with exclude, no trailing /' '
+test_expect_success 'clone, then sync with exclude, no trailing /' '
 	test_when_finished cleanup_git &&
 	git p4 clone -//depot/discard/... -//depot/discard_file --dest="$git" //depot/...@all &&
 	(