Refactor evogalaxy

* extract functions
* use local variables

tools/ansible-evogalaxy

@@ -3,8 +3,40 @@
 # PoC to handle Evolix ansible-roles
 # WARN: we use -b unstable for now
 
-subcommand=$1
-option=$2
+readonly PROGNAME=$(basename $0)
+readonly PROGDIR=$(readlink -m $(dirname $0))
+readonly ARGS="$@"
+
+main(){
+    local subcommand=$1
+
+    case $subcommand in
+        "help")
+        sub_help
+        ;;
+
+        "list")
+        sub_list
+        ;;
+
+        "install")
+        local role=$2
+
+        sub_install $role
+        ;;
+
+        "update")
+        local role=$2
+
+        sub_update $role
+        ;;
+
+        *)
+        echo "error: unknwon command"
+        sub_help
+        ;;
+    esac
+}
 
 sub_help(){
     echo ""
@@ -17,33 +49,73 @@ sub_help(){
     echo ""
 }
 
-case $subcommand in
-    "help")
-    sub_help
-    ;;
-    "list")
-    tmpdir=`mktemp -d`
-    git clone -q -b unstable https://forge.evolix.org/ansible-roles.git $tmpdir
-    ls -1 $tmpdir | egrep -v '(.md|.yml|Vagrant)'
-    ;;
-    "install")
-    test -d jessie/$option && echo "error: already installed" && exit
-    tmpdir=`mktemp -d`
-    git clone -q -b unstable https://forge.evolix.org/ansible-roles.git $tmpdir
-    mkdir -p jessie
-    mv $tmpdir/$option jessie/
-    ;; 
-    "update")
-    ! test -d jessie/$option && echo "error: not installed" && exit
-    tmpdir=`mktemp -d`
-    git clone -q -b unstable https://forge.evolix.org/ansible-roles.git $tmpdir
-    mv jessie/$option $tmpdir/$option-old
-    mv $tmpdir/$option jessie/
-    ;;
-    *)
-    echo "error: unknwon command"
-    sub_help
-    ;;
-esac 
+sub_list(){
+    local clone_dir=$(clone_git_repository)
 
+    list_roles $clone_dir
+}
 
+sub_install(){
+    local role=$1
+
+    test -d jessie/$role \
+        && exit_role_already_installed $role
+
+    local clone_dir=$(clone_git_repository)
+
+    test -d $clone_dir/$role \
+        || exit_role_unknown $role
+
+    mkdir -p jessie \
+        && mv $clone_dir/$role jessie/$role
+}
+
+sub_update(){
+    local role=$1
+
+    test -d jessie/$role \
+        || exit_role_not_installed $role
+
+    local clone_dir=$(clone_git_repository)
+
+    mv jessie/$role $clone_dir/$role-old \
+        && mv $clone_dir/$role jessie/$role
+}
+
+clone_git_repository() {
+    local clone_dir=$(mktemp -d)
+    local git_repo=https://forge.evolix.org/ansible-roles.git
+    local git_branch=unstable
+
+    git clone -q -b $git_branch $git_repo $clone_dir
+
+    echo $clone_dir
+}
+
+list_roles(){
+    local roles_dir=$1
+
+    ls -1 $roles_dir \
+        | egrep -v '(.md|.yml|Vagrant)'
+}
+
+exit_role_already_installed(){
+    local role=$1
+
+    echo "error: role '${role}' already installed"
+    exit 1
+}
+exit_role_not_installed(){
+    local role=$1
+
+    echo "error: role '${role}' not installed"
+    exit 2
+}
+exit_role_unknown(){
+    local role=$1
+
+    echo "error: unknown role '${role}'"
+    exit 3
+}
+
+main $ARGS