Implement eval command via nodetool

THANKS

@@ -127,3 +127,4 @@ alisdair sullivan
 Alexander Verbitsky
 Andras Horvath
 Drew Varner
+Roberto Aloi

priv/templates/simplenode.nodetool

@@ -95,9 +95,23 @@ main(Args) ->
                 Other ->
                     io:format("~p\n", [Other])
             end;
+        ["eval", Str0] ->
+            Str = string:strip(Str0, right, $.) ++ ".",
+            Bindings = erl_eval:new_bindings(),
+            case rpc:call(TargetNode,
+                          erl_eval,
+                          exprs,
+                          [parse(Str), Bindings],
+                          60000) of
+                {badrpc, Reason} ->
+                    io:format("RPC to ~p failed: ~p\n", [TargetNode, Reason]),
+                    halt(1);
+                {value, Value, _Bindings} ->
+                    io:format("~p\n", [Value])
+            end;
         Other ->
             io:format("Other: ~p\n", [Other]),
-            io:format("Usage: nodetool {chkconfig|getpid|ping|stop|restart|reboot|rpc|rpc_infinity|rpcterms}\n")
+            io:format("Usage: nodetool {chkconfig|getpid|ping|stop|restart|reboot|rpc|rpc_infinity|rpcterms|eval}\n")
     end,
     net_kernel:stop().
 
@@ -180,3 +194,8 @@ consult(Cont, Str, Acc) ->
         {more, Cont1} ->
             consult(Cont1, eof, Acc)
     end.
+
+parse(Str) ->
+    {ok, Tokens, _} = erl_scan:string(Str),
+    {ok, Exprs} = erl_parse:parse_exprs(Tokens),
+    Exprs.

priv/templates/simplenode.runner

@@ -293,6 +293,19 @@ case "$1" in
         exec $ERTS_PATH/to_erl $PIPE_DIR
         ;;
 
+    eval)
+        # Make sure a node IS running
+        ping_node > /dev/null 2>&1
+        ES=$?
+        if [ "$ES" -ne 0 ]; then
+            echo "Node is not running!"
+            exit $ES
+        fi
+
+        shift
+        $NODETOOL eval "$1"
+        ;;
+
     remote_console)
         # Make sure a node is running
         ping_node
@@ -396,7 +409,7 @@ case "$1" in
         echo $PID
         ;;
     *)
-        echo "Usage: $SCRIPT {start|start_boot <file>|foreground|stop|restart|reboot|ping|console|getpid|console_clean|console_boot <file>|attach|remote_console|upgrade}"
+        echo "Usage: $SCRIPT {start|start_boot <file>|foreground|stop|restart|reboot|ping|console|getpid|console_clean|console_boot <file>|attach|eval|remote_console|upgrade}"
         exit 1
         ;;
 esac

test/upgrade_project/rel/files/dummy

@@ -234,6 +234,19 @@ case "$1" in
         exec $ERTS_PATH/to_erl $PIPE_DIR
         ;;
 
+    eval)
+        # Make sure a node IS running
+        ping_node > /dev/null 2>&1
+        ES=$?
+        if [ "$ES" -ne 0 ]; then
+            echo "Node is not running!"
+            exit $ES
+        fi
+
+        shift
+        $NODETOOL eval "$1"
+        ;;
+
     remote_console)
         # Make sure a node is running
         ping_node
@@ -339,7 +352,7 @@ case "$1" in
         echo $PID
         ;;
     *)
-        echo "Usage: $SCRIPT {start|start_boot <file>|foreground|stop|restart|reboot|ping|console|getpid|console_clean|console_boot <file>|attach|remote_console|upgrade}"
+        echo "Usage: $SCRIPT {start|start_boot <file>|foreground|stop|restart|reboot|ping|console|getpid|console_clean|console_boot <file>|attach|eval|remote_console|upgrade}"
         exit 1
         ;;
 esac

test/upgrade_project/rel/files/nodetool

@@ -95,9 +95,23 @@ main(Args) ->
                 Other ->
                     io:format("~p\n", [Other])
             end;
+        ["eval", Str0] ->
+            Str = string:strip(Str0, right, $.) ++ ".",
+            Bindings = erl_eval:new_bindings(),
+            case rpc:call(TargetNode,
+                          erl_eval,
+                          exprs,
+                          [parse(Str), Bindings],
+                          60000) of
+                {badrpc, Reason} ->
+                    io:format("RPC to ~p failed: ~p\n", [TargetNode, Reason]),
+                    halt(1);
+                {value, Value, _Bindings} ->
+                    io:format("~p\n", [Value])
+            end;
         Other ->
             io:format("Other: ~p\n", [Other]),
-            io:format("Usage: nodetool {chkconfig|getpid|ping|stop|restart|reboot|rpc|rpc_infinity|rpcterms}\n")
+            io:format("Usage: nodetool {chkconfig|getpid|ping|stop|restart|reboot|rpc|rpc_infinity|rpcterms|eval}\n")
     end,
     net_kernel:stop().
 
@@ -180,3 +194,8 @@ consult(Cont, Str, Acc) ->
         {more, Cont1} ->
             consult(Cont1, eof, Acc)
     end.
+
+parse(Str) ->
+    {ok, Tokens, _} = erl_scan:string(Str),
+    {ok, Exprs} = erl_parse:parse_exprs(Tokens),
+    Exprs.