From 96a4b8c279940c22b5db62b88d7987ec6cadef51 Mon Sep 17 00:00:00 2001
From: Tharre <tharre3@gmail.com>
Date: Mon, 23 Apr 2018 02:46:40 +0200
Subject: Add pre-commit hook that checks code formatting

---
 .hooks/pre-commit | 34 ++++++++++++++++++++++++++++++++++
 pom.xml           | 22 ++++++++++++++++++++++
 2 files changed, 56 insertions(+)
 create mode 100755 .hooks/pre-commit

diff --git a/.hooks/pre-commit b/.hooks/pre-commit
new file mode 100755
index 0000000..0f4c49a
--- /dev/null
+++ b/.hooks/pre-commit
@@ -0,0 +1,34 @@
+#!/bin/sh
+
+trap 'rm -rf "$temp_dir"' EXIT
+temp_dir=".tmp"
+
+IFS='
+'
+for staged_file in $(git diff --cached --name-only); do
+    [ -f "${staged_file}" ] || continue
+    [ "${staged_file##*.}" = "java" ] || continue
+
+    check_files=y
+    mkdir -p "$temp_dir/$(dirname "$staged_file")"
+    git show :"$staged_file" > "$temp_dir/$staged_file"
+done
+unset IFS
+
+[ -z "$check_files" ] && exit 0
+
+printf "%s\n" "-a -n --set-exit-if-changed" > "$temp_dir/gf_config"
+
+find "$temp_dir" -name '*.java' >> "$temp_dir/gf_config"
+
+output=$(./mvnw -q exec:java \
+                -Dexec.mainClass="com.google.googlejavaformat.java.Main" \
+                -Dexec.args="@$temp_dir/gf_config")
+
+if [ $? != 0 ]; then
+    echo 'Run "./mvnw -q com.coveo:fmt-maven-plugin:format" first.' >&2
+    echo "Following files were rejected by the formatter:" >&2
+    escaped=$(printf '%s\n' "$temp_dir/" | sed 's/[[\.*^$/]/\\&/g')
+    printf "%s\n" "$output" | sed "s/$escaped/    /" >&2
+    exit 1
+fi
diff --git a/pom.xml b/pom.xml
index 172ff4f..c0587cc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,9 +23,11 @@
         <!-- test dependencies -->
         <junit.version>4.12</junit.version>
         <mockito.version>2.18.0</mockito.version>
+        <google-java-format.version>1.5</google-java-format.version>
         <!-- plugins -->
         <maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
         <maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
+        <fmt-maven-plugin.version>2.4.0</fmt-maven-plugin.version>
     </properties>
 
     <dependencies>
@@ -83,6 +85,11 @@
             <version>${mockito.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.googlejavaformat</groupId>
+            <artifactId>google-java-format</artifactId>
+            <version>${google-java-format.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -131,6 +138,21 @@
                     </transformers>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>com.coveo</groupId>
+                <artifactId>fmt-maven-plugin</artifactId>
+                <version>${fmt-maven-plugin.version}</version>
+                <configuration>
+                    <style>aosp</style>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>format</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 
-- 
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