Allow 'today' as special keyword for link/unlink

The app crashes if no node for the current day has been created, either
from `add` or something else. This allows the user to specify `today` as
a keyword in order to automatically add the date node.

cmd/grit/cmds.go

@@ -215,7 +215,9 @@ func cmdUncheck(cmd *cli.Cmd) {
 func cmdLink(cmd *cli.Cmd) {
 	cmd.Spec = "ORIGIN TARGETS..."
 	var (
-		origin  = cmd.StringArg("ORIGIN", "", "origin selector")
+		origin  = cmd.StringArg("ORIGIN", "",
+														"origin selector. 'today' is a valid option and will" +
+														" create the node if it doesn't already exist")
 		targets = cmd.StringsArg("TARGETS", nil, "target selector(s)")
 	)
 	cmd.Action = func() {
@@ -225,6 +227,11 @@ func cmdLink(cmd *cli.Cmd) {
 		}
 		defer a.Close()
 
+		today := time.Now().Format("2006-01-02")
+		if *origin == "today" {
+			*origin = today
+		}
+
 		for _, t := range *targets {
 			if _, err := a.LinkNodes(*origin, t); err != nil {
 				errf("Couldn't create link (%s) -> (%s): %v\n", *origin, t, err)
@@ -236,7 +243,9 @@ func cmdLink(cmd *cli.Cmd) {
 func cmdUnlink(cmd *cli.Cmd) {
 	cmd.Spec = "ORIGIN ( -A | -P | TARGETS... )"
 	var (
-		origin = cmd.StringArg("ORIGIN", "", "origin selector")
+		origin  = cmd.StringArg("ORIGIN", "",
+														"origin selector. 'today' is a valid option and will" +
+														" create the node if it doesn't already exist")
 		targets = cmd.StringsArg("TARGETS", nil, "target selector")
 		allChildren = cmd.BoolOpt("A allChildren", false,
 			"unlink all children of the node")
@@ -250,6 +259,11 @@ func cmdUnlink(cmd *cli.Cmd) {
 		}
 		defer a.Close()
 
+		today := time.Now().Format("2006-01-02")
+		if *origin == "today" {
+			*origin = today
+		}
+
 		originNode, err := a.GetGraph(*origin)
 		if err != nil {
 			die(err)

multitree/validate.go

@@ -13,7 +13,7 @@ func ValidateNodeName(name string) error {
 	if len(name) == 0 {
 		return errors.New("invalid node name (empty name)")
 	}
-	if len(name) > 100 {
+	if len(name) > 200 {
 		return errors.New("invalid node name (name too long)")
 	}
 	return nil