From e6abe7b4e8a799c7215898c510726f6509adbf29 Mon Sep 17 00:00:00 2001
From: qxo <49526356@qq.com>
Date: Sat, 19 Sep 2020 08:38:16 +0800
Subject: [PATCH] [MCHECKSTYLE-397] support ${config_loc} on checkstyle xml

we can use config_loc as: ${config_loc}/suppressions.xml.

with this PR, we can use same checkstyle.xml which contains ${config_loc}

for eclipsecs ${config_loc} is a variable of Eclipse and it will refer to the same directory where the checkstyle.xml is present.
ref: https://checkstyle.org/eclipse-cs/#!/properties
---
 .../checkstyle/exec/DefaultCheckstyleExecutor.java | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/main/java/org/apache/maven/plugins/checkstyle/exec/DefaultCheckstyleExecutor.java b/src/main/java/org/apache/maven/plugins/checkstyle/exec/DefaultCheckstyleExecutor.java
index ce7f213d..82d84b82 100644
--- a/src/main/java/org/apache/maven/plugins/checkstyle/exec/DefaultCheckstyleExecutor.java
+++ b/src/main/java/org/apache/maven/plugins/checkstyle/exec/DefaultCheckstyleExecutor.java
@@ -584,6 +584,20 @@ private Properties getOverridingProperties( CheckstyleExecutorRequest request )
             }
         }
 
+        //${config_loc} for the origin dir of the configLocation, just like eclipsecs
+        // so we config such as `${config_loc}/checkstyle-suppressions.xml`
+        final String configLocation = request.getConfigLocation();
+        final int idx = configLocation.lastIndexOf( '/' );
+        final String configLoc;
+        if ( idx == -1 ) 
+        {
+            configLoc = "";
+        }
+        else
+        {
+            configLoc = configLocation.substring( 0, idx );
+        }
+        p.setProperty( "config_loc", configLoc );
         return p;
     }