Add Android code style enforcement to lint.sh

This requires buildbot changes: the path to the Android Studio
installation must be supplied in an environment variable.

Modified files are copied out to a temporary directory, Android Studio
is asked to format the files, and a git diff is performed.

2 files changed, 245 insertions, 0 deletions

diff --git a/Source/Android/code-style-java.xml b/Source/Android/code-style-java.xml
new file mode 100644
index 0000000000..f51bcf3281
--- /dev/null
+++ b/Source/Android/code-style-java.xml
@@ -0,0 +1,204 @@
+<code_scheme name="Dolphin-Java">
+  <option name="FIELD_NAME_PREFIX" value="m" />
+  <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="99" />
+  <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="99" />
+  <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
+    <value />
+  </option>
+  <option name="IMPORT_LAYOUT_TABLE">
+    <value>
+      <package name="android" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="com" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="junit" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="net" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="org" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="java" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="javax" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="" withSubpackages="true" static="false" />
+      <emptyLine />
+      <package name="" withSubpackages="true" static="true" />
+      <emptyLine />
+    </value>
+  </option>
+  <option name="RIGHT_MARGIN" value="100" />
+  <AndroidXmlCodeStyleSettings>
+    <option name="USE_CUSTOM_SETTINGS" value="true" />
+  </AndroidXmlCodeStyleSettings>
+  <XML>
+    <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
+  </XML>
+  <codeStyleSettings language="JAVA">
+    <option name="BRACE_STYLE" value="2" />
+    <option name="CLASS_BRACE_STYLE" value="2" />
+    <option name="METHOD_BRACE_STYLE" value="2" />
+    <option name="ELSE_ON_NEW_LINE" value="true" />
+    <option name="CATCH_ON_NEW_LINE" value="true" />
+    <indentOptions>
+      <option name="USE_TAB_CHARACTER" value="true" />
+    </indentOptions>
+  </codeStyleSettings>
+  <codeStyleSettings language="XML">
+    <option name="FORCE_REARRANGE_MODE" value="1" />
+    <indentOptions>
+      <option name="CONTINUATION_INDENT_SIZE" value="4" />
+    </indentOptions>
+    <arrangement>
+      <rules>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>xmlns:android</NAME>
+                <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>xmlns:.*</NAME>
+                <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*:id</NAME>
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*:name</NAME>
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>name</NAME>
+                <XML_NAMESPACE>^$</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>style</NAME>
+                <XML_NAMESPACE>^$</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*</NAME>
+                <XML_NAMESPACE>^$</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*:layout_width</NAME>
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*:layout_height</NAME>
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*:layout_.*</NAME>
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*:width</NAME>
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*:height</NAME>
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*</NAME>
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*</NAME>
+                <XML_NAMESPACE>.*</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+      </rules>
+    </arrangement>
+  </codeStyleSettings>
+</code_scheme>
\ No newline at end of file
diff --git a/Tools/lint.sh b/Tools/lint.sh
index 795dfdd0b5..3fe608f613 100755
--- a/Tools/lint.sh
+++ b/Tools/lint.sh
@@ -41,6 +41,23 @@ if [ $FORCE -eq 0 ]; then
   fi
 fi
 
+did_java_setup=0
+JAVA_CODESTYLE_FILE="./$(git rev-parse --show-cdup)/Source/Android/code-style-java.xml"
+java_temp_dir=""
+
+function java_setup() {
+  if [ "$did_java_setup" = 1 ]; then
+    return
+  fi
+  if [ ! -x "${ANDROID_STUDIO_ROOT}/bin/format.sh" ]; then
+    echo >&2 "error: must set ANDROID_STUDIO_ROOT environment variable to the IDE installation directory (current: ${ANDROID_STUDIO_ROOT})"
+    exit 1
+  fi
+  java_temp_dir="$(mktemp -d)"
+  trap "{ rm -r ${java_temp_dir}; }" EXIT
+  did_java_setup=1
+}
+
 fail=0
 
 # Default to staged files, unless a commit was passed.
@@ -49,9 +66,29 @@ COMMIT=${1:---cached}
 # Get modified files (must be on own line for exit-code handling)
 modified_files=$(git diff --name-only --diff-filter=ACMRTUXB $COMMIT)
 
+function java_check() {
+  echo >&0 "Java changes detected, running Android Studio formatter." || true
+  "${ANDROID_STUDIO_ROOT}/bin/format.sh" -s "${JAVA_CODESTYLE_FILE}" -R "${java_temp_dir}" >/dev/null
+
+  # ignore 'added'/'deleted' files, we copied only files of interest to the tmpdir
+  d=$(git diff --diff-filter=ad . "${java_temp_dir}" || true)
+  if ! [ -z "${d}" ]; then
+    echo "!!! Java code is not compliant to coding style, here is the fix:"
+    echo "${d}"
+    fail=1
+  fi
+}
+
 # Loop through each modified file.
 for f in ${modified_files}; do
   # Filter them.
+  if echo "${f}" | egrep -q "[.]java$"; then
+    # Copy Java files to a temporary directory
+    java_setup
+    mkdir -p $(dirname "${java_temp_dir}/${f}")
+    cp "${f}" "${java_temp_dir}/${f}"
+    continue
+  fi
   if ! echo "${f}" | egrep -q "[.](cpp|h|mm)$"; then
     continue
   fi
@@ -76,4 +113,8 @@ for f in ${modified_files}; do
   fi
 done
 
+if [ "${did_java_setup}" = 1 ]; then
+  java_check
+fi
+
 exit ${fail}