rmdir: New builtin.

* gash/commands/rmdir.scm: New file.
* build-aux/build-guile.sh: Compile it.
* configure: Create script.
* gash/bournish-commands.scm (rmdir-command): New variable.
(%bournish-commands): Add it.
* gash/shell-utils.scm (rmdir-p): New function.

.gitignore

@@ -12,6 +12,7 @@
 /bin/mkdir
 /bin/reboot
 /bin/rm
+/bin/rmdir
 /bin/sed
 /bin/sh
 /bin/tar

build-aux/build-guile.sh

@@ -59,6 +59,7 @@ ${srcdest}gash/commands/ls.scm
 ${srcdest}gash/commands/mkdir.scm
 ${srcdest}gash/commands/reboot.scm
 ${srcdest}gash/commands/rm.scm
+${srcdest}gash/commands/rmdir.scm
 ${srcdest}gash/commands/sed.scm
 ${srcdest}gash/commands/tar.scm
 ${srcdest}gash/commands/wc.scm
@@ -78,6 +79,7 @@ ${srcdest}bin/ls
 ${srcdest}bin/mkdir
 ${srcdest}bin/reboot
 ${srcdest}bin/rm
+${srcdest}bin/rmdir
 ${srcdest}bin/sed
 ${srcdest}bin/tar
 ${srcdest}bin/wc

configure

@@ -99,6 +99,7 @@ ls
 mkdir
 reboot
 rm
+rmdir
 sed
 tar
 wc 

gash/bournish-commands.scm

@@ -80,6 +80,7 @@
 (define mkdir-command (wrap-command "mkdir" mkdir))
 (define reboot-command (wrap-command "reboot" reboot'))
 (define rm-command (wrap-command "rm" rm))
+(define rmdir-command (wrap-command "rmdir" rmdir))
 (define sed-command (wrap-command "sed" sed))
 (define tar-command (wrap-command "tar" tar))
 (define wc-command (wrap-command "wc" wc))
@@ -96,6 +97,7 @@
     ("mkdir"    . ,mkdir)
     ("reboot"   . ,reboot-command)
     ("rm"       . ,rm-command)
+    ("rmdir"    . ,rmdir-command)
     ("sed"      . ,sed-command)
     ("tar"      . ,tar-command)
     ("wc"       . ,wc-command)

gash/commands/rmdir.scm

@@ -0,0 +1,71 @@
+;;; Gash -- Guile As SHell
+;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of Gash.
+;;;
+;;; Gash 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.
+;;;
+;;; Gash 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 Gash.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(define-module (gash commands rmdir)
+  #:use-module (ice-9 getopt-long)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 receive)
+  #:use-module (ice-9 regex)
+
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-9 gnu)
+  #:use-module (srfi srfi-26)
+
+  #:use-module (gash config)
+  #:use-module (gash guix-utils)
+  #:use-module (gash shell-utils)
+
+  #:export (
+            rmdir
+            ))
+
+(define (rmdir . args)
+  (let* ((option-spec
+	  '((help (single-char #\h))
+            (parents (single-char #\p))
+            (version (single-char #\V))))
+	 (options (getopt-long args option-spec))
+	 (files (option-ref options '() '()))
+         (parents? (option-ref options 'parents #f))
+	 (help? (option-ref options 'help #f))
+         (version? (option-ref options 'version #f))
+         (files (option-ref options '() '()))
+         (usage? (and (not help?) (null? files))))
+    (cond (version? (format #t "rmdir (GASH) ~a\n" %version) (exit 0))
+          ((or help? usage?) (format (if usage? (current-error-port) #t)
+                                     "\
+Usage: rmdir [OPTION]... DIRECTORY...
+Remove the DIRECTORY(ies), if they are empty.
+
+Options:
+      --help              display this help and exit
+  -p, --parents           remove DIRECTORY and its ancestors; e.g., 'rmdir -p a/b/c' is
+                          similar to 'rmdir a/b/c a/b a'
+      --version           output version information and exit
+
+")
+           (exit (if usage? 2 0)))
+          (else
+           (if parents? (for-each rmdir-p files)
+               (for-each rmdir files))))))
+
+(define main rmdir)

gash/shell-utils.scm

@@ -70,6 +70,7 @@
             grep-match-column
             grep-match-end-column
             mkdir-p
+            rmdir-p
             multi-opt
 
             directory-exists?
@@ -270,6 +271,14 @@ transferred and the continuation of the transfer as a thunk."
                  (apply throw args))))))
       (() #t))))
 
+(define (rmdir-p dir)
+  "Remove directory DIR and all its ancestors."
+  (rmdir dir)
+  (let loop ((dir (dirname dir)))
+    (when (not (equal? dir "."))
+      (rmdir dir)
+      (loop (dirname dir)))))
+
 (define (file-exists?* file)
   "Like 'file-exists?' but emits a warning if FILE is not accessible."
   (catch 'system-error