Nested commands help message

[guile-click.git] / click / command.scm

diff --git a/click/command.scm b/click/command.scm
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+;;; Click --- Command Line Interface Creation Kit for GNU Guile
+;;; Copyright © 2021 Javier Sancho <jsf@jsancho.org>
+;;;
+;;; This file is part of Click.
+;;;
+;;; Click is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; Click is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Click.  If not, see <http://www.gnu.org/licenses/>.
+
+
+(define-module (click command)
+  #:export (command?
+            command-commands
+            command-help-text
+            command-name
+            command-option-spec
+            command-procedure
+            group?
+            make-command
+            set-command-click-manager!))
+
+
+;; Command VTable
+(define <command-vtable> (make-struct/no-tail <applicable-struct-vtable> 'pwpwpwpwpwpw))
+
+(define (command-printer struct port)
+  (let ((type (if (group? struct) "Group" "Command"))
+        (name (command-name struct)))
+    (if name
+        (format port "<~a ~a>" type name)
+        (format port "<~a>" type))))
+
+(struct-set! <command-vtable> vtable-index-printer command-printer)
+
+
+;; Command API
+(define (make-command name option-spec help-text procedure commands)
+  (make-struct/no-tail <command-vtable> #f name option-spec help-text procedure commands))
+
+(define (set-command-click-manager! command click-manager)
+  (struct-set! command 0 click-manager))
+
+(define (command-name command)
+  (struct-ref command 1))
+
+(define (command-option-spec command)
+  (struct-ref command 2))
+
+(define (command-help-text command)
+  (struct-ref command 3))
+
+(define (command-procedure command)
+  (struct-ref command 4))
+
+(define (command-commands command)
+  (struct-ref command 5))
+
+(define (command? command)
+  (and (equal? (struct-vtable command) <command-vtable>)
+       (null? (command-commands command))))
+
+(define (group? command)
+  (and (equal? (struct-vtable command) <command-vtable>)
+       (not (null? (command-commands command)))))