Add a --quiet option to only display warnings.
This will be useful when this script is called embedded.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Philippe Mathieu-Daude <philmd@redhat.com>
---
 BaseTools/Scripts/PatchCheck.py | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/BaseTools/Scripts/PatchCheck.py b/BaseTools/Scripts/PatchCheck.py
index 8bcf857a7d15..f907e96b9501 100755
--- a/BaseTools/Scripts/PatchCheck.py
+++ b/BaseTools/Scripts/PatchCheck.py
@@ -19,7 +19,7 @@ import subprocess
 import sys
 
 class Verbose:
-    SILENT, ONELINE, NORMAL = range(3)
+    SILENT, QUIET, ONELINE, NORMAL = range(4)
     level = NORMAL
 
 class CommitMessageCheck:
@@ -56,10 +56,10 @@ class CommitMessageCheck:
             print(self.url)
 
     def error(self, *err):
-        if self.ok and Verbose.level > Verbose.ONELINE:
+        if self.ok and Verbose.level >= Verbose.QUIET:
             print('The commit message format is not valid:')
         self.ok = False
-        if Verbose.level < Verbose.NORMAL:
+        if Verbose.level in [Verbose.SILENT, Verbose.ONELINE]:
             return
         count = 0
         for line in err:
@@ -404,10 +404,10 @@ class GitDiffCheck:
         self.error(err, err2)
 
     def error(self, *err):
-        if self.ok and Verbose.level > Verbose.ONELINE:
+        if self.ok and Verbose.level >= Verbose.QUIET:
             print('Code format is not valid:')
         self.ok = False
-        if Verbose.level < Verbose.NORMAL:
+        if Verbose.level in [Verbose.SILENT, Verbose.ONELINE]:
             return
         count = 0
         for line in err:
@@ -530,7 +530,8 @@ class CheckGitCommits:
                     print()
                 else:
                     blank_line = True
-                print('Checking git commit:', commit)
+                if Verbose.level > Verbose.QUIET:
+                    print('Checking git commit:', commit)
             patch = self.read_patch_from_git(commit)
             self.ok &= CheckOnePatch(commit, patch).ok
         if not commits:
@@ -634,12 +635,17 @@ class PatchCheckApp:
         group.add_argument("--oneline",
                            action="store_true",
                            help="Print one result per line")
+        group.add_argument("--quiet",
+                           action="store_true",
+                           help="Only print warnings and errors")
         group.add_argument("--silent",
                            action="store_true",
                            help="Print nothing")
         self.args = parser.parse_args()
         if self.args.oneline:
             Verbose.level = Verbose.ONELINE
+        if self.args.quiet:
+            Verbose.level = Verbose.QUIET
         if self.args.silent:
             Verbose.level = Verbose.SILENT
 
-- 
2.21.0


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