Added install feature with gvm implementation.

bin/gvm

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 GVM_DIR="$HOME/.gvm"
+GVM_SERVICE="http://localhost:8080/gvm-service"
 
 if [ ! -d "$GVM_DIR" ]; then
 	mkdir "$GVM_DIR"
@@ -9,20 +10,58 @@ if [ ! -d "$GVM_DIR" ]; then
 	echo ""
 fi
 
-if [ "$1" == "help" -o -z "$1" -o -z "$2" ]; then
-	echo "Usage: gvm <command> <candidate> [version]"
-	echo "   commands: install, uninstall, list, use or help"
-	echo "   candidate: groovy, grails, griffon or gradle"
-	echo "   version: defaults to latest stable if not provided"
+if [ ! $(which curl) ]; then
+	echo "Please install curl through your package manager before using this tool."
 	exit 0
 fi
 
+if [ "$1" == "help" -o -z "$1" -o -z "$2" ]; then
+	echo "Usage: gvm <command> <candidate> [version]"
+	echo ""
+	echo "   commands  :  install, uninstall, list, use or help"
+	echo "   candidate :  groovy, grails, griffon or gradle"
+	echo "   version   :  defaults to latest stable if not provided"
+	echo ""
+	echo "eg: gvm install grails 2.1.0"
+	exit 0
+fi
+
+function download {
+	CANDIDATE="$1"
+	VERSION="$2"
+	echo "Downloading $CANDIDATE $VERSION"
+	curl -L "$GVM_SERVICE/$CANDIDATE/download/$VERSION" >> "/tmp/$CANDIDATE-$VERSION.zip"
+}
+
 function gvm-install {
-	echo Installing: "$1"
+	CANDIDATE="$1"
+	if [ -z "$2" ]; then
+		VERSION=$(curl "$GVM_SERVICE/$CANDIDATE/version")
+	else
+		VERSION=$(curl "$GVM_SERVICE/$CANDIDATE/version/$2")
+	fi
+
+	if [ -z "$VERSION" ]; then
+		echo ""
+		echo "Stop! $2 is not a valid grails version."
+		exit 0
+	fi
+
+	echo "Downloading: $CANDIDATE $VERSION"
+	download "$CANDIDATE" "$VERSION"
+	echo "Installing: $CANDIDATE $VERSION"
+	mkdir -p "$GVM_DIR/$CANDIDATE"
+	unzip -q "/tmp/$CANDIDATE-$VERSION.zip" -d "/tmp/"
+	mv -v "/tmp/$CANDIDATE-$VERSION" "$GVM_DIR/$CANDIDATE/$VERSION"
+	rm "/tmp/$CANDIDATE-$VERSION.zip"
+	echo "Done installing!"
+	echo ""
+	echo "Start using $CANDIDATE $VERSION by issuing the following command:"
+	echo "   gvm use $CANDIDATE $VERSION"
 }
 
 function gvm-use {
 	echo Using: "$1"
 }
 
-gvm-"$1" "$2"
+gvm-"$1" "$2" "$3"

src/test/cucumber/gvm/command_line_interop.feature

@@ -15,10 +15,6 @@ Feature: Command Line Interop
 		When I enter "gvm install"
 		Then I see "Usage: gvm <command> <candidate> [version]"
 
-	Scenario: Install a Candidate
-		When I enter "gvm install grails"
-		Then I see "Installing: grails"
-
 	Scenario: Use without providing a Candidate
 		When I enter "gvm use"
 		Then I see "Usage: gvm <command> <candidate> [version]"

src/test/cucumber/gvm/initialisation.feature

@@ -10,4 +10,4 @@ Feature: Initialisation
 		Given an initialised system
 		When I enter "gvm"
 		Then I see "Usage: gvm <command> <candidate> [version]"
-		And the ".gvm" folder exists in user home
+		And the ".gvm" folder exists in user home

src/test/cucumber/gvm/installation.feature

@@ -0,0 +1,16 @@
+Feature: Installation
+
+	Scenario: Install a default Candidate
+		Given the default "grails" candidate is "2.1.0"
+		When I enter "gvm install grails"
+		Then the candidate "grails" version "2.1.0" is installed
+		And I see "Done installing!"
+
+	Scenario: Install a specific Candidate
+		When I enter "gvm install grails 1.3.9"
+		Then the candidate "grails" version "1.3.9" is installed
+		And I see "Done installing!"
+
+	Scenario: Install a Candidate version that does not exist
+		When I enter "gvm install grails 1.4.4"
+		Then I see "Stop! 1.4.4 is not a valid grails version."

src/test/resources/gvm/installation_steps.groovy

@@ -0,0 +1,7 @@
+import static cucumber.runtime.groovy.EN.*
+import cucumber.runtime.PendingException
+
+Then(~'^the candidate can be found at "([^"]*)"$') { String path ->
+	def file = new File(path)
+	assert file.exists(), "$path does not exist!"
+}