dirname: New builtin.

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

.gitignore

@@ -5,6 +5,7 @@
 /bin/chmod
 /bin/compress
 /bin/cp
+/bin/dirname
 /bin/find
 /bin/gash
 /bin/grep

build-aux/build-guile.sh

@@ -53,6 +53,7 @@ ${srcdest}gash/commands/cat.scm
 ${srcdest}gash/commands/chmod.scm
 ${srcdest}gash/commands/compress.scm
 ${srcdest}gash/commands/cp.scm
+${srcdest}gash/commands/dirname.scm
 ${srcdest}gash/commands/find.scm
 ${srcdest}gash/commands/grep.scm
 ${srcdest}gash/commands/ls.scm
@@ -73,6 +74,7 @@ ${srcdest}bin/cat
 ${srcdest}bin/chmod
 ${srcdest}bin/compress
 ${srcdest}bin/cp
+${srcdest}bin/dirname
 ${srcdest}bin/find
 ${srcdest}bin/gash
 ${srcdest}bin/grep

configure

@@ -93,6 +93,7 @@ cat
 chmod
 compress
 cp
+dirname
 find
 grep
 ls

gash/bournish-commands.scm

@@ -34,6 +34,7 @@
   #:use-module (gash commands cat)
   #:use-module (gash commands compress)
   #:use-module (gash commands cp)
+  #:use-module (gash commands dirname)
   #:use-module (gash commands find)
   #:use-module (gash commands grep)
   #:use-module (gash commands ls)
@@ -50,6 +51,7 @@
             cat-command
             compress-command
             cp-command
+            dirname-command
             find-command
             grep-command
             ls-command
@@ -75,6 +77,7 @@
 (define cat-command (wrap-command cat "cat"))
 (define compress-command (wrap-command "compress" compress))
 (define cp-command (wrap-command "cp" cp))
+(define dirname-command (wrap-command "dirname" dirname))
 (define find-command (wrap-command "find" find))
 (define grep-command (wrap-command "grep" grep))
 (define ls-command (wrap-command "ls" ls))
@@ -93,6 +96,7 @@
     ("cat"      . ,cat-command)
     ("compress" . ,compress-command)
     ("cp"       . ,cp-command)
+    ("dirname"  . ,dirname-command)
     ("find"     . ,find-command)
     ("grep"     . ,grep-command)
     ("ls"       . ,ls-command)

gash/commands/dirname.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 dirname)
+  #: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 (
+            dirname
+            ))
+
+(define (dirname . args)
+  (let* ((option-spec
+	  '((help (single-char #\h))
+            (version (single-char #\V))
+            (zero (single-char #\z))))
+	 (options (getopt-long args option-spec))
+	 (help? (option-ref options 'help #f))
+         (version? (option-ref options 'version #f))
+         (files (option-ref options '() '()))
+         (zero? (option-ref options 'zero #f))
+         (usage? (and (not help?) (null? files))))
+    (cond (version? (format #t "dirname (GASH) ~a\n" %version) (exit 0))
+          ((or help? usage?) (format (if usage? (current-error-port) #t)
+                                     "\
+Usage: dirname [OPTION] FILE...
+Output each NAME with its last non-slash component and trailing slashes
+removed; if NAME contains no /'s, output '.' (meaning the current directory).
+
+Options:
+      --help              display this help and exit
+      --version           output version information and exit
+  -z, --zero     end each output line with NUL, not newline
+")
+           (exit (if usage? 2 0)))
+          (else
+           (for-each (lambda (file)
+                       (display ((@ (guile) dirname) file))
+                       (if zero? (display #\nul) (newline)))
+                     files)))))
+
+(define main dirname)