Merge pull request #48 from caarlos0/gradle

Added gradle support

README.md

@@ -3,7 +3,7 @@
 > The _"Java Version Manager"_
 
 Automatically change `JAVA_HOME` and `PATH` based on current directory
-`.java-version` or `pom.xml` files.
+`.java-version`, `pom.xml` and `build.gradle` files.
 
 The philosophy behind this project is to simplify and automate the `JAVA_HOME`
 changing, much like `rbenv` and `rvm` do for Ruby.
@@ -27,10 +27,12 @@ $ echo "source ~/.jvm/jvm.sh" >> ~/.zshrc
 Then, just `cd` to a java project folder. `jvm` will look for a `.java-version`
 and use whatever version is inside it. If the file don't exist, but a
 `pom.xml` do, `jvm` will try to extract the version from the `pom.xml` file
-using a regular expression.
+using a regular expression. If no `pom.xml` is found, it will look for the
+`build.gradle` file and do the same strategy to extract the java version.
 
-`jvm` can also recursively search for `.java-version` and `pom.xml` files, so,
-`cd`-ing to project's subfolder should maintain its version set.
+`jvm` can also recursively search for `.java-version`, `pom.xml` and
+`build.gradle` files, so, `cd`-ing to project's subfolder should maintain
+its version set.
 
 You can always change the current folder java version by doing:
 
@@ -47,6 +49,13 @@ example, you can run `jvm config` and add a line like this:
 6-openjdk=/path/to/openjdk/6
 ```
 
+or even:
+
+```properties
+6=/path/to/openjdk/6
+```
+
+
 And `jvm` will automagically works.
 
 And, yes, this strategy (based on `jvm config`) can make `jvm` work on Windows

jvm.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 # RegExp used to find the java version in a pom file.
-JVM_REGEX="<(java.version|maven.compiler.source|source)>1\.[4-9]</.*>"
+POM_REGEX="<(java.version|maven.compiler.source|source)>1\.[4-9]</.*>"
+# RegExp used to find the java version in a build.gradle file.
+GRADLE_REGEX="(sourceCompatibility|targetCompatibility) ?= ?1\.[4-9]"
 
 # finds the java home for the given version
 __jvm_javahome() {
@@ -42,20 +44,33 @@ __jvm_set() {
   export PATH="${JAVA_HOME}/bin:$PATH"
 }
 
-# tried to find the java version using regex.
+# tries to find the java version using regex inside a pom.xml file.
 __jvm_pomversion() {
   # shellcheck disable=SC2039
-  local tag pom
-  pom="$1/pom.xml"
+  local proj tag pom
+  proj="$1"
+  pom="$proj/pom.xml"
   test ! -s "$pom" && return 1
-  tag="$(grep -Eo "$JVM_REGEX" "$pom")"
+  tag="$(grep -Eo "$POM_REGEX" "$pom")"
   test -z "$tag" && return 1
   echo "$tag" |
     cut -f2 -d'>' |
     cut -f2 -d'.' |
     cut -f1 -d'<'
 }
 
+# tries to find the java version using regex inside a build.gradle file.
+__jvm_gradleversion() {
+  # shellcheck disable=SC2039
+  local proj property build
+  proj="$1"
+  build="$proj/build.gradle"
+  test ! -s "$build" && return 1
+  property="$(grep -Eo "$GRADLE_REGEX" "$build" | head -n1)"
+  test -z "$property" && return 1
+  echo "$property" | tr -d ' ' | cut -f2 -d '=' | cut -f2 -d'.'
+}
+
 # tries to get the version from the local .java-version
 __jvm_local_version() {
   # shellcheck disable=SC2039
@@ -83,6 +98,9 @@ __jvm_version() {
   # try to extract from pom.xml
   test -z "$version" && version="$(__jvm_pomversion "$proj")"
 
+  # try to extrat from build.gradle
+  test -z "$version" && version="$(__jvm_gradleversion "$proj")"
+
   # go up looking for pom.xmls and .java-versions
   parent="$proj/.."
   test -z "$version" &&

tests/complex-gradle/build.gradle

@@ -0,0 +1 @@
+sourceCompatibility = 1.7

tests/complex-gradle/sub/build.gradle

@@ -0,0 +1 @@
+// empty

tests/gradle/build.gradle

@@ -0,0 +1 @@
+sourceCompatibility = 1.7

tests/test.clitest.md

@@ -89,6 +89,45 @@ $ jvm version
 $
 ```
 
+# simple build.gradle
+
+Test a simple `build.gradle` with only one source/target Compatibility property
+set.
+
+```console
+$ cd "$ROOT/$TESTS/gradle"
+$ jvm reload
+$ jvm version
+7
+$
+```
+
+# complex build.gradle
+
+Test a simple `build.gradle` with both source and target compatibility property
+set.
+
+```console
+$ cd "$ROOT/$TESTS/complex-gradle"
+$ jvm reload
+$ jvm version
+7
+$
+```
+
+# parent build.gradle
+
+When the build.gradle in the current folder don't define the java version,
+look for files in the parent folder.
+
+```console
+$ cd "$ROOT/$TESTS/complex-gradle/sub"
+$ jvm reload
+$ jvm version
+7
+$
+```
+
 # jvmconfig
 
 Test that `jvm` respects a custom java version in `~/.jvmconfig`, in this case,