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;;; -*- Log: code.log; Package: Lisp -*-
;;; ### Some day fix to accept :wild in any pathname component.
;;; **********************************************************************
;;; This code was written as part of the Spice Lisp project at
;;; Carnegie-Mellon University, and has been placed in the public domain.
;;; If you want to use this code or any part of Spice Lisp, please contact
;;; Scott Fahlman (FAHLMAN@CMUC). 
;;; **********************************************************************
;;;
;;; Ugly pathname functions for Spice Lisp.
;;;    these functions are part of the standard Spice Lisp environment.
;;;
;;; Written by Jim Large and Rob MacLachlan
;;;
;;; **********************************************************************
(in-package 'lisp)
(export '(pathname pathnamep *default-pathname-defaults* truename
	  parse-namestring merge-pathnames make-pathname
	  pathname-host pathname-device pathname-directory
	  pathname-name pathname-type pathname-version
	  namestring file-namestring directory-namestring
	  host-namestring enough-namestring user-homedir-pathname
          probe-file rename-file delete-file file-write-date
	  file-author directory))

(use-package "EXTENSIONS")

(in-package "EXTENSIONS")
(export '(print-directory complete-file ambiguous-files default-directory
			  file-writable))
(in-package 'lisp)


;;; Pathname structure


;;; *Default-Pathname-defaults* has all values unspecified except for the
;;;  host.  All pathnames must have a host.
(defvar *default-pathname-defaults* ()
  "Set to the default pathname-defaults pathname (Got that?)")

(defun filesys-init ()
  (setq *default-pathname-defaults* 
	(%make-pathname "Mach" nil nil nil nil nil)))


;;; The pathname type is defined with a defstruct.
;;; This declaration implicitly defines the common lisp function Pathnamep
(defstruct (pathname
	    (:conc-name %pathname-)
	    (:print-function %print-pathname)
	    (:constructor
	     %make-pathname (host device directory name type version))
	    (:predicate pathnamep))
  "Pathname is the structure of the file pathname.  It consists of a
   host, a device, a directory, a name, and a type."
  (host nil :type (or simple-string null))
  (device nil :type (or simple-string (member nil :absolute)))
  (directory nil :type (or simple-vector null))
  (name nil :type (or simple-string null))
  (type nil :type (or simple-string null))
  (version nil :type (or integer (member nil :newest))))

(defun %print-pathname (s stream d)
  (declare (ignore d))
  (format stream "#.(pathname ~S)" (namestring s)))

(defun make-pathname (&key defaults (host nil hostp) (device nil devicep)
			   (directory nil directoryp) (name nil namep)
			   (type nil typep) (version nil versionp))
  "Create a pathname from :host, :device, :directory, :name, :type and :version.
  If any field is ommitted, it is obtained from :defaults as though by 
  merge-pathnames."
  (if defaults
      (let ((defaults (pathname defaults)))
	(unless hostp
	  (setq host (%pathname-host defaults)))
	(unless devicep
	  (setq device (%pathname-device defaults)))
	(unless directoryp
	  (setq directory (%pathname-directory defaults)))
	(unless namep
	  (setq name (%pathname-name defaults)))
	(unless typep
	  (setq type (%pathname-type defaults)))
	(unless versionp
	  (setq version (%pathname-version defaults))))
      (unless hostp
	(setq host (%pathname-host *default-pathname-defaults*))))

  (when (stringp directory)
    (setq directory (%pathname-directory (parse-namestring directory))))
  (%make-pathname
   (if (stringp host) (coerce host 'simple-string) host)
   (if (stringp device) (coerce device 'simple-string) device)
   directory
   (if (stringp name) (coerce name 'simple-string) name)
   (if (stringp type) (coerce type 'simple-string) type)
   version))


;;; These can not be done by the accessors because the pathname arg may be
;;;  a string or a symbol or etc.

(defun pathname-host (pathname)
  "Returns the host slot of pathname.  Pathname may be a string, symbol,
  or stream."
  (%pathname-host (if (pathnamep pathname) pathname (pathname pathname))))

(defun pathname-device (pathname)
  "Returns the device slot of pathname.  Pathname may be a string, symbol,
  or stream."
  (%pathname-device (if (pathnamep pathname) pathname (pathname pathname))))

(defun pathname-directory (pathname)
  "Returns the directory slot of pathname.  Pathname may be a string,
  symbol, or stream."
  (%pathname-directory (if (pathnamep pathname) pathname (pathname pathname))))

(defun pathname-name (pathname)
  "Returns the name slot of pathname.  Pathname may be a string,
  symbol, or stream."
  (%pathname-name (if (pathnamep pathname) pathname (pathname pathname))))

(defun pathname-type (pathname)
  "Returns the type slot of pathname.  Pathname may be a string,
  symbol, or stream."
  (%pathname-type (if (pathnamep pathname) pathname (pathname pathname))))

(defun pathname-version (pathname)
  "Returns the version slot of pathname.  Pathname may be a string,
  symbol, or stream."
  (%pathname-version (if (pathnamep pathname) pathname (pathname pathname))))



;;;; FSM Compiler

(eval-when (compile eval)
;;; These macros are used in the code emitted by deflex.  They refer
;;; to local vars in the defined function.

(defmacro fsm-scan ()
  '(progn
    (incf pointer)
    (setq current-char (if (>= pointer end)
			   :end
			   (char string pointer)))))

;;; fsm-emit expands into a form which pushes FLAG onto *deflex-tokens* and
;;;  then pushes a string containing the ACCUMULATED characters
(defmacro fsm-emit (flag)
  `(progn
    (vector-push-extend ,flag *deflex-tokens*)
    (vector-push-extend (subseq buffer 0 buffer-index) *deflex-tokens*)
    (setq buffer-index 0)))

;;; fsm-dotfix expands into a form which replaces the last EMITTED flag with
;;;  FLAG, and the last EMITTED token with its self + "." + the ACCUMULATED
;;;  characters.
(defmacro fsm-dotfix (flag)
  `(let ((prev-token (vector-pop *deflex-tokens*)))
     (setf (aref *deflex-tokens* (1- (fill-pointer *deflex-tokens*))) ,flag)
     (vector-push (concatenate 'simple-string
			       prev-token
			       "."
			       (subseq buffer 0 buffer-index))
		  *deflex-tokens*)
     (setq buffer-index 0)))


(defun deflex-arc (arc)
  (do ((set (nth 0 arc))
       (new-state (nth 2 arc))
       (actions (nth 3 arc) (if (member (car actions) '(EMIT DOTFIX))
				(cddr actions)
				(cdr actions)))
       (action-forms
	()
	(cons (case (car actions)
		(ACCUMULATE '(progn 
			      (setf (schar buffer buffer-index) current-char)
			      (incf buffer-index)))
		(SCAN '(fsm-scan))
		(EMIT `(fsm-emit ,(nth 1 actions)))
		(DOTFIX `(fsm-dotfix ,(nth 1 actions)))
		(t (error "Illegal action ~s" (car actions))))
	      action-forms)))
      ((null actions)
       `(when ,(cond ((eq set ':end) `(eq current-char ,set))
		     ((eq set T) T)
		     (t
		      `(and (not (eq current-char :end))
			    ,(if (characterp set)
				 `(char= current-char ,set)
				 `(find current-char
					(the simple-string ,set))))))
	  ,@(nreverse action-forms)
	  (go ,new-state)))))


(defun deflex-state (state)
  (do ((state-name (car state))
       (arc-list (cdr state) (cdr arc-list))
       (form-list () (cons (deflex-arc (car arc-list)) form-list)))
      ((null arc-list)
       `(,state-name
	 ,@(nreverse form-list)
	 (go JAM)))))

(defmacro deflex (name &rest states)
  (do ((states states (cdr states))
       (body-forms () (append body-forms (deflex-state (car states)))))
      ((null states)
       `(defun ,(concat-pnames 'lex- name)
	       (string &optional (start 0) (end (length string)))
	  (declare (simple-string string)
		   (fixnum start end))
	  (setf (fill-pointer *deflex-tokens*) 0)
	  (prog ((current-char (if (> end start)
				   (char string start) :end))
		 (pointer start)
		 (buffer *deflex-buffer*)
		 (buffer-index 0))
	    (declare (simple-string buffer))
	    ,@body-forms
	    
	    WIN (return (values T pointer))
	    JAM (return (values NIL pointer)))))))

); eval-when (compile eval)


(defvar *deflex-buffer* (make-string 100))
(defvar *deflex-tokens* (make-array 20 :adjustable t :fill-pointer 0))



;;;; FSM for lexing pathnames.

(defconstant ses-name-char
  "#@$-+*%0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~")

(defconstant fs-whitespace ;whitespace in filenames
  " 	
")

;;; Lex-ses-file-spec separates a sesame file name into its components
;;;
;;;  STRING -- the string containing the file spec.
;;; &optional
;;;  START  -- the first character to look at (defaults to 0)
;;;  END    -- 1+ the last character to look at (defaluts to (length STRING))
;;;
;;; Returns multiple values.
;;;  1st -- () for failure or a list of tokens.
;;;  2nd -- the index of the character that stopped the parse
;;;
;;;    Tokens are represented by a keyword and a string in *deflex-tokens*.
;;; The first token is of type :logical-name (string is log name) or :absolute.
;;; Subsequent tokens are of type :directory-name, :file-name, :extension, or
;;; the string being a pathname component.
;;;
(deflex ses-file-spec
  ;;S1 waits for the first non whitespace character
  (S1 (fs-whitespace --> S1 (SCAN))
      (#\- --> JAM)			;- illegal as start of file name
      (#\/ --> S3 (EMIT :absolute SCAN));/ starts an absolute pathname
      (#\\ --> S2a (ACCUMULATE SCAN))   ;\ quotes char in name or logname
      (#\. --> S5 (EMIT :file-name SCAN))     ;. maybe ends file name
      (ses-name-char --> S2 (ACCUMULATE SCAN))  ;first char in a name or logname
      (:end --> WIN)			; Null filename is legal.
      )

  ;;S2 accumulates chars in a file name, logical name, or directory name.
  (S2 (#\: --> S3 (EMIT :logical-name SCAN))  ;: ends log-name, starts next name
      (#\/ --> S3 (EMIT :directory-name SCAN));/ ends directory name,starts next
      (#\\ --> S2a (ACCUMULATE SCAN))         ;\ quotes char in name
      (#\. --> S5 (EMIT :file-name SCAN))     ;. maybe ends file name
      (:end --> WIN (EMIT :file-name))
      (ses-name-char --> S2 (ACCUMULATE SCAN))
      (fs-whitespace --> S9 (EMIT :file-name SCAN))
      (T --> JAM (EMIT :file-name))
      )

  ;;S2a waits for any char following a \ found in S2
  (S2a (:END --> JAM)
       (T --> S2 (ACCUMULATE SCAN)))

  ;;S3 accumulates chars in a file name or directory name
  (S3 (#\/ --> JAM)
      (T --> S3b))
  (S3b (#\/ --> S3 (EMIT :directory-name SCAN));/ ends directory name,starts next
       (#\. --> S4 (EMIT :file-name SCAN))     ;. maybe ends file name
       (#\\ --> S3a (ACCUMULATE SCAN))         ;\ quotes char in name
       (:end --> WIN (EMIT :file-name))
       (ses-name-char --> S3b (ACCUMULATE SCAN))
       (fs-whitespace --> S9 (EMIT :file-name SCAN))
       (T --> JAM (EMIT :file-name))
       )

  ;;S3a waits for any char following a \ found in S3
  (S3a (:end --> JAM)
       (T --> S3b (ACCUMULATE SCAN)))

  ;;S4 waits for chars in a name following a dot.  If it encounters the end of
  ;; the pathname, then the chars are the extension.  Otherwise, the chars are
  ;; really part of the last token, so we mash them back on with dotfix.
  (S4 (#\/ --> S3 (DOTFIX :directory-name SCAN))
      (#\\ --> S4a (ACCUMULATE SCAN))
      (#\. --> S4 (DOTFIX :file-name SCAN))
      (:end --> WIN (EMIT :extension))
      (fs-whitespace --> S9 (EMIT :extension SCAN))
      (ses-name-char --> S4 (ACCUMULATE SCAN))
      (T --> JAM (EMIT :extension))
      )

  ;;S4a waits for any char following a \ found in S4
  (S4a (:end --> JAM)
       (T --> S4 (ACCUMULATE SCAN)))

  ;;S5 is the same as S4 but name may also be logical name
  (S5 (#\/ --> S3 (DOTFIX :directory-name SCAN))
      (#\: --> S3 (DOTFIX :logical-name SCAN))
      (#\\ --> S5a (ACCUMULATE SCAN))
      (#\. --> S5 (DOTFIX :file-name SCAN))
      (:end --> WIN (EMIT :extension))
      (fs-whitespace --> S9 (EMIT :extension SCAN))
      (ses-name-char --> S5 (ACCUMULATE SCAN))
      (T --> JAM (EMIT :extension))
      )

  ;;S5a waits for any char following a \ found in S5
  (S5a (:end --> JAM)
       (T --> S5 (ACCUMULATE SCAN)))

  ;;S9 eats trailing whitespace.
  (S9 (fs-whitespace --> S9 (SCAN))
      (:end --> WIN)
      (t --> JAM))
  )
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;; ses-tokens->pathname converts the contents of *deflex-tokens* into a pathname
;;; 
(defun ses-tokens->pathname ()
  (do ((end (fill-pointer *deflex-tokens*))
       (result (make-pathname))
       (dirlist ())
       (token-val ())
       (ix 0 (+ ix 2))
       (default t))
      ((>= ix end)
       (setf (%pathname-directory result)
	     (cond (dirlist
		    (when default (setf (%pathname-device result) "Default"))
		    (coerce (the list (nreverse dirlist)) 'simple-vector))
		   (default nil)
		   (t '#())))
       result)
    (declare (list dirlist)
	     (fixnum ix end))
    (setq token-val (aref *deflex-tokens* (1+ ix)))
    (case (aref *deflex-tokens* ix)
      (:ABSOLUTE
       (setf (%pathname-device result) :ABSOLUTE)
       (setq default nil))
      (:LOGICAL-NAME
       (setf (%pathname-device result) token-val)
       (setq default nil))
      (:DIRECTORY-NAME (push token-val dirlist))
      (:FILE-NAME
       (unless (zerop (length (the simple-string token-val)))
	 (setf (%pathname-name result) token-val)))
      (:EXTENSION (setf (%pathname-type result) token-val)))))



;;;; PARSE-NAMESTRING and PATHNAME.

(defun parse-namestring (thing &optional host 
			       (defaults *default-pathname-defaults*)
			       &key (start 0) end (junk-allowed nil))
  "Parses a string representation of a pathname into a pathname."
  (declare (ignore host defaults))
  (let* ((thing (typecase thing
		  (string (coerce thing 'simple-string))
		  (pathname (return-from parse-namestring (values thing start)))
		  (stream (file-name thing))
		  (symbol (symbol-name thing))
		  (t (error "This thing is a bad thing for parse-namestring: ~S"
			    thing))))
	 (end (or end (length thing))))
    (declare (simple-string thing))
    (multiple-value-bind (won next-field)
			 (lex-ses-file-spec thing start end)
      (unless (or won junk-allowed)
	(error "There's junk in this thing that you gave to parse-namestring:~%~
		~4T\"~A\"~%~0,1,V,'.@A" thing (+ next-field 5) #\^))
      (values (ses-tokens->pathname) next-field))))

(defun pathname (thing)
  "Turns thing into a pathname.  Thing may be a string, symbol, stream, or
   pathname."
  (values (parse-namestring thing)))



;;; Merge-Pathnames  --  Public
;;;
;;; Returns a new pathname whose fields are the same as the fields in PATHNAME
;;;  except that () fields are filled in from defaults.  Type and Version field
;;;  are only done if name field has to be done (see manual for explanation).
;;;
(defun merge-pathnames (pathname &optional
				 (defaults *default-pathname-defaults*)
				 default-version)
  "Fills in unspecified slots of Pathname from Defaults (defaults to
  *default-pathname-defaults*).  If the version remains unspecified,
  gets it from Default-Version."
  ;;
  ;; finish hairy argument defaulting
  (setq pathname (pathname pathname))
  (setq defaults (pathname defaults))
  ;;
  ;; make a new pathname
  (let ((name (%pathname-name pathname))
	(device (%pathname-device pathname)))
    (%make-pathname
     (or (%pathname-host pathname) (%pathname-host defaults))
     (or device (%pathname-device defaults))
     (or (%pathname-directory pathname) (%pathname-directory defaults))
     (or name (%pathname-name defaults))
     (or (%pathname-type pathname) (%pathname-type defaults))
     (or (%pathname-version pathname)
	 (if name
	     default-version
	     (or (%pathname-version defaults) default-version))))))


;;;; NAMESTRING and other stringification stuff.

;;; %Dirstring  --  Internal
;;;
;;; %Dirstring converts a vector of the form #("foo" "bar" ... "baz") into a
;;;  string of the form "foo/bar/ ... /baz/"

(defun %dirstring (dirlist)
  (declare (simple-vector dirlist))
  (let* ((numdirs (length dirlist))
	 (length numdirs))
    (declare (fixnum numdirs length))
    (dotimes (i numdirs)
      (incf length (the fixnum (length (svref dirlist i)))))
    (do ((result (make-string length))
	 (index 0 (1+ index))
	 (position 0))
	((= index numdirs) result)
      (declare (simple-string result))
      (let* ((string (svref dirlist index))
	     (len (length string))
	     (end (+ position len)))
	(declare (simple-string string)
		 (fixnum len end))
	(replace result string :start1 position  :end1 end  :end2 len)
	(setf (schar result end) #\/)
	(setq position (+ end 1))))))

(defun quick-integer-to-string (n)
  (cond ((zerop n) "0")
	((eql n 1) "1")
	((minusp n)
	 (concatenate 'simple-string "-"
		      (the simple-string (quick-integer-to-string (- n)))))
	(t
	 (do* ((len (1+ (truncate (integer-length n) 3)))
	       (res (make-string len))
	       (i (1- len) (1- i))
	       (q n)
	       (r 0))
	      ((zerop q)
	       (incf i)
	       (replace res res :start2 i :end2 len)
	       (%primitive shrink-vector res (- len i)))
	   (declare (simple-string res)
		    (fixnum len i r))
	   (multiple-value-setq (q r) (truncate q 10))
	   (setf (schar res i) (schar "0123456789" r))))))
	   
(defun %device-string (device)
  (cond ((eq device :absolute) "/")
	(device
	 (if (string-equal device "Default")
	     ""
	     (concatenate 'simple-string (the simple-string device) ":")))
	(T "")))

(defun namestring (pathname)
  "Returns the full form of PATHNAME as a string."
  (setq pathname (pathname pathname))
  (let* ((directory (%pathname-directory pathname))
	 (name (%pathname-name pathname))
	 (type (%pathname-type pathname))
	 (result (%device-string (%pathname-device pathname))))
    (declare (simple-string result))
    (when directory
      (setq result (concatenate 'simple-string result
				(the simple-string (%dirstring directory)))))
    (when name
      (setq result (concatenate 'simple-string result 
				(the simple-string name))))
    (when type
      (setq result (concatenate 'simple-string result "."
				(the simple-string type))))
    result))

(defun %ses-get-useful-name (pathname)
  "NAMESTRING of pathname ignoring the device slot."
  (setq pathname (pathname pathname))
  (let* ((directory (%pathname-directory pathname))
	 (name (%pathname-name pathname))
	 (type (%pathname-type pathname))
	 (result ""))
    (declare (simple-string result))
    (when directory
      (setq result (concatenate 'simple-string result
				(the simple-string (%dirstring directory)))))
    (when name
      (setq result (concatenate 'simple-string result 
				(the simple-string name))))
    (when type
      (setq result (concatenate 'simple-string result "."
				(the simple-string type))))
    result))

;;; This function is somewhat bummed to make the Hemlock directory command
;;; is fast.
;;;
(defun file-namestring (pathname)
  "Returns the name, type, and version of PATHNAME as a string."
  (unless (pathnamep pathname) (setq pathname (pathname pathname)))
  (let* ((name (%pathname-name pathname))
	 (type (%pathname-type pathname))
	 (result (or name "")))
    (declare (simple-string result))
    (if type
	(concatenate 'simple-string result "." type)
	result)))

(defun directory-namestring (pathname)
  "Returns the device & directory parts of PATHNAME as a string."
  (setq pathname (pathname pathname))
  (let* ((directory (%pathname-directory pathname))
 	 (result (%device-string (%pathname-device pathname))))
    (declare (simple-string result))
    (when directory
      (setq result (concatenate 'simple-string result
				(the simple-string (%dirstring directory)))))
    result))

(defun host-namestring (pathname)
  "Returns the host part of PATHNAME as a string."
  (setq pathname (pathname pathname))
  (%pathname-host pathname))



;;;; ENOUGH-NAMESTRING

(defun enough-namestring (pathname &optional
				   (defaults *default-pathname-defaults*))
  "Returns a string which uniquely identifies PATHNAME w.r.t. DEFAULTS." 
  (setq pathname (pathname pathname))
  (setq defaults (pathname defaults))
  (let* ((device (%pathname-device pathname))
	 (directory (%pathname-directory pathname))
	 (name (%pathname-name pathname))
	 (type (%pathname-type pathname))
	 (result "")
	 (need-name nil))
    (declare (simple-string result))
    (when (and device (string-not-equal device (%pathname-device defaults)))
      (setq result (%device-string device)))
    (when (and directory
	       (not (equalp directory (%pathname-directory defaults))))
      (setq result (concatenate 'simple-string result
				(the simple-string (%dirstring directory)))))
    (when (and name (string-not-equal name (%pathname-name defaults)))
      (setq result (concatenate 'simple-string result 
				(the simple-string name))
	    need-name t))
    (when (and type (or need-name
			(string-not-equal type (%pathname-type defaults))))
      (setq result (concatenate 'simple-string result "."
				(the simple-string type))))
    result))



;;;; TRUENAME and other stuff probing stuff.

;;; Truename  --  Public
;;;
;;;    Another silly file function trivially different from another function.
;;;
(defun truename (pathname)
  "Return the pathname for the actual file described by the pathname
  An error is signalled if no such file exists."
  (let ((result (probe-file pathname)))
    (unless result
      (error "The file ~S does not exist." (namestring pathname)))
    result))

;;; Do-Search-List  --  Internal
;;;
;;;    Bind var in turn to each element of search list with the specifed
;;; name.
;;;
(defmacro do-search-list ((var name &optional exit-form) . body)
  "Do-Search-List (Var Name [Exit-Form]) {Form}*"
  `(dolist (,var (resolve-search-list ,name nil) ,exit-form)
     (declare (simple-string ,var))
     ,@body))


;;; Sub-Probe-File  --  Internal
;;;
;;;    Does the work of Probe-File, returning an additional value which
;;; indicates whether the name is really a file.
;;;
(defun sub-probe-file (pathname)
  (setq pathname (pathname pathname))
  (flet ((pathnamify (ns etype)
	   (declare (simple-string ns))
	   (case etype
	     (:entry_remote
	      (values (parse-namestring (concatenate 'simple-string ns "/"))
		      :entry_directory))
	     (t
	      (values (parse-namestring ns) etype)))))
    (let ((log-name (or (%pathname-device pathname) "default")))
      (if (eq log-name :absolute)
	  (let ((namestring (namestring pathname)))
	    (multiple-value-bind (name etype)
				 (mach:unix-subtestname namestring)
	      (if (null name) NIL
		  (pathnamify name etype))))
	  (if (null (%pathname-device pathname))
	      (multiple-value-bind (name etype)
				   (mach:unix-subtestname
				    (%ses-get-useful-name pathname))
		(if (null name) NIL (pathnamify name etype)))
	      (let ((namestring (%ses-get-useful-name pathname)))
		(do-search-list (entry log-name)
		  (let ((str (concatenate 'simple-string entry namestring)))
		    (declare (simple-string str))
		    (multiple-value-bind (name etype)
					 (mach:unix-subtestname str)
		      (when name
			(return (pathnamify name etype))))))))))))


;;; Probe-File  --  Public
;;;
;;;    Just call Sub-Probe-File and return nil when it isn't a file.
;;;
(defun probe-file (pathname)
  "Return a pathname which is the truename of the file if it exists, NIL
  otherwise.  Returns NIL for directories and other non-file entries."
  (multiple-value-bind (pn f)
		       (sub-probe-file pathname)
    (if (eq f :entry_file) pn)))



;;; Predict-Name  --  Internal
;;;
;;;    Predict-Name is a function used by Open to get an absolute pathname 
;;; for a file being opened.  Returns the truename of the file and
;;; whether it really exists or not.
;;;
(defun predict-name (file-name for-input)
  (let* ((pathname (pathname file-name))
	 (device (%pathname-device pathname))
	 (truename (probe-file pathname)))
    (cond ((eq device :absolute)
	   (if truename
	       (values (namestring truename) t)
	       ;; Try again in case file-name is a directory.
	       (predict-name-with-subtest (namestring pathname))))
	  ((and for-input truename)
	   (values (namestring truename) t))
	  (t
	   (let ((expansion (resolve-search-list (or device "default") t)))
	     (let ((name (concatenate 'simple-string (car expansion)
				      (%ses-get-useful-name pathname))))
	       (declare (simple-string name))
	       (predict-name-with-subtest name)))))))

(defun predict-name-with-subtest (name)
  (let ((gr (mach:unix-subtestname name)))
    (if gr
	(values gr t)
	(values (mach::simplify-file-name name) nil))))



;;; Rename-File  --  Public
;;;
;;;    If File is a File-Stream, then rename the associated file if it exists,
;;; otherwise just change the name in the stream.  If not a file stream, then
;;; just rename the file.
;;;
(defun rename-file (file new-name)
  "Rename File to have the specified New-Name.  If file is a stream open to a
  file, then the associated file is renamed.  If the file does not yet exist
  then the file is created with the New-Name when the stream is closed."
  (if (streamp file)
      (let* ((name (file-name file))
	     (pn (parse-namestring name))
	     (npn (merge-pathnames new-name pn))
	     (new (predict-name npn nil)))
	(when (mach:quick-subtestname name)
	  (multiple-value-bind (res err) (mach:Unix-rename name new)
	    (if (null res) (error "Failed to rename ~A to ~A, unix error: ~A."
				  name new (mach:get-unix-error-msg err)))))
	(file-name file new)
	(values npn pn (parse-namestring new)))
      (let* ((pn (or (sub-probe-file file)
		     (error "File to rename does not exist: ~S" file)))
	     (npn (merge-pathnames new-name pn))
	     (new (predict-name npn nil)))
	(multiple-value-bind (res err) (mach:unix-rename (namestring pn) new)
	  (if res (values npn pn (parse-namestring new))
	      (error "Failed to rename ~A to ~A, unix error: ~A."
		     (namestring pn) new (mach:get-unix-error-msg err)))))))

;;; Delete-File  --  Public
;;;
;;;    Delete the file, Man.
;;;
(defun delete-file (file)
  "Delete the specified file."
  (let ((tn (sub-probe-file file)))
    (when (streamp file)
      (close file :abort t))
    (if tn
	(let ((ns (namestring tn)))
	  (multiple-value-bind (res err) (mach:unix-unlink ns)
	    (if (null res)
		(error "Failed to delete ~A, unix error: ~A."
		       ns (mach:get-unix-error-msg err)))))
	(unless (streamp file)
	  (error "File to be deleted does not exist: ~S" file)))) 
  t)

;;; User-Homedir-Pathname  --  Public
;;;
;;;    If the user wants a meaningful homedir, she has to define Home:.
;;; Someday, login may do this for us.  Since we must always return something,
;;; we just return Default: if it isn't defined.
;;;
(defun user-homedir-pathname (&optional host)
  "Returns the home directory of the logged in user as a pathname.
  This is obtained from the logical name \"home:\".  If this is not defined,
  then we return \"default:\""
  (declare (ignore host))
  (let ((home (cdr (assoc :home *environment-list* :test #'eq))))
    (if home
	(pathname (if (string-equal home "/") "/"
		      (concatenate 'simple-string home "/")))
	(let ((expansion (if (search-list "home:")
			     (resolve-search-list "home" t))))
	  (if expansion
	      (car expansion)
	      (make-pathname :device "default"))))))

;;; File-Write-Date  --  Public
;;;
(defun file-write-date (file)
  "Return file's creation date, or NIL if it doesn't exist."
  (let ((tn (sub-probe-file file)))
    (when tn
      (multiple-value-bind (res dev ino mode nlink uid gid
				rdev size atime mtime)
			   (mach:unix-stat (namestring tn))
	(declare (ignore dev ino mode nlink uid gid rdev size atime))
	(if (null res) 0
	    (+ unix-to-universal-time mtime))))))

;;; File-Author  --  Public
;;;
(defun file-author (file)
  "Returns the file author as a string, or nil if the author cannot be
   determined.  Signals an error if file doesn't exist."
  (let ((filename (truename file)))
    (multiple-value-bind (winp dev ino mode nlink uid)
			 (mach:unix-stat (namestring filename))
      (declare (ignore dev ino mode nlink))
      (if winp (lookup-login-name uid)))))



;;;; DIRECTORY.

;;; DO-DIRECTORY searches a directory, binding the vars to the name and entry
;;; type.  Pattern and All are used in MACH:UNIX-SEARCH-DIRECTORY.
;;;
(defmacro do-directory ((name-var etype-var pattern &optional (all t) result)
			. body)
  "Do-Directory (Name Entry-Type Pattern [All] [Result]) {Form}*.
   If All is non-nil (the default), then Unix dot files to be processed.
   Unix dot and dot-dot are never processed."
  (let ((file (gensym))
	(res (gensym))
	(type (gensym))
	(p (gensym)))
    `(dolist (,file (mach:unix-search-directory ,pattern ,all)
		    ,result)
       (declare (simple-string ,file))
       (let* ((,p (position #\/ ,file :from-end t))
	      (,name-var
	       (if ,p
		   (subseq ,file (the fixnum (1+ (the fixnum ,p))))
		   ,file)))
	 (declare (simple-string ,name-var))
	 (unless (or (string= "." ,name-var) (string= ".." ,name-var))
	   (let ((,etype-var (multiple-value-bind (,res ,type)
						  (mach:quick-subtestname ,file)
			       (declare (ignore ,res))
			       ,type)))
	     ,@body))))))

(defun directory (pathname &key (all t))
  "Returns a list of pathnames, one for each file that matches the given
   pathname.  Supplying :all as nil causes this to ignore Unix dot files.  This
   never includes Unix dot and dot-dot in the result."
  (setq pathname (pathname pathname))
  (multiple-value-bind (dir pattern) (find-directory pathname)
    (let ((res ()))
      (do-directory (name etype pattern all)
	(if (eq etype :entry_file)
	    (let ((last-dot (position #\. name :from-end t)))
	      (push
	       (%make-pathname
		"Mach" :absolute dir
		(if last-dot (subseq name 0 last-dot) name)
		(if last-dot (subseq name (1+ last-dot)))
		nil)
	       res))
	    (push
	     (%make-pathname
	      "Mach" :absolute
	      (concatenate 'simple-vector dir (vector name))
	      nil nil nil)
	     res)))
      (nreverse res))))

;;; FIND-DIRECTORY returns an absolute directory vector for pathname as a
;;; first argument and an absolute namestring.  The namestring includes a
;;; trailing asterisk, wildcard, when the given pathname is immediately
;;; probe-able as a directory.
;;;
(defun find-directory (pathname)
  (multiple-value-bind (pn type)
		       (sub-probe-file pathname)
    (if pn
	(let ((ns (namestring pn)))
	  (declare (simple-string ns))
	  (case type
	    (:entry_directory
	     (when (char/= (schar ns (the fixnum (1- (length ns)))) #\/)
	       (setq ns (concatenate 'simple-string ns "/")))
	     (values (%pathname-directory (pathname ns))
		     (concatenate 'simple-string ns "*")))
	    (t (values (%pathname-directory pn) ns))))
	(multiple-value-bind (pn type)
			     (sub-probe-file
			      (make-pathname
			       :directory (%pathname-directory pathname)
			       :device (%pathname-device pathname)))
	  (unless pn
	    (error "Directory does not exist: ~S" pathname))
	  (let ((ns (namestring pn)))
	    (case type
	      (:entry_directory
	       (values
		(%pathname-directory pn)
		(concatenate 'simple-string ns (file-namestring pathname))))
	      (t
	       (error "~S is not a directory." pathname))))))))



;;;; Printing directories and determining file owner names.

;;; PRINT-DIRECTORY is exported from the EXTENSIONS package.
;;; 
(defun print-directory (pathname &optional stream &key all verbose return-list)
  "Like Directory, but prints a terse, multi-coloumn directory listing
   instead of returning a list of pathnames.  When :all is supplied and
   non-nil, then Unix dot files are included too (as ls -a).  When :vervose
   is supplied and non-nil, then a long listing of miscellaneous
   information is output one file per line."
  (setf pathname (pathname pathname))
  (let ((*standard-output* (out-synonym-of stream)))
    (if verbose
	(print-directory-verbose pathname all return-list)
	(print-directory-formatted pathname all return-list))))

(defun print-directory-verbose (pathname all return-list)
  (multiple-value-bind (dir pattern) (find-directory pathname)
    (declare (ignore dir))
    (format t "Directory of ~A :~%" pattern)
    (let ((dir-name (directory-namestring pattern))
	  (result ()))
      (do-directory (name etype pattern all (nreverse result))
	(let ((slash-name (if (eq etype :entry_file)
			      name
			      (concatenate 'simple-string name "/"))))
	  (declare (simple-string slash-name))
	  (when return-list
	    (push (pathname (concatenate 'simple-string dir-name slash-name))
		  result))
	  (multiple-value-bind 
	      (reslt dev-or-err ino mode nlink uid gid rdev size atime mtime)
	      (mach:unix-stat (concatenate 'simple-string dir-name name))
	    (declare (ignore ino gid rdev atime)
		     (fixnum uid mode))
	    (cond (reslt
		   ;;
		   ;; Print characters for file modes.
		   (macrolet ((frob (bit name &optional sbit sname negate)
				`(if ,(if negate
					  `(not (logbitp ,bit mode))
					  `(logbitp ,bit mode))
				     ,(if sbit
					  `(if (logbitp ,sbit mode)
					       (write-char ,sname)
					       (write-char ,name))
					  `(write-char ,name))
				     (write-char #\-))))
		     (frob 15 #\d nil nil t)
		     (frob 8 #\r)
		     (frob 7 #\w)
		     (frob 6 #\x 11 #\s)
		     (frob 5 #\r)
		     (frob 4 #\w)
		     (frob 3 #\x 10 #\s)
		     (frob 2 #\r)
		     (frob 1 #\w)
		     (frob 0 #\x))
		   ;;
		   ;; Print the rest.
		   (multiple-value-bind (sec min hour date month year)
					(get-decoded-time)
		     (declare (ignore sec min hour date month))
		     (format t "~2D ~8A ~8D ~12A ~A~%"
			     nlink
			     (or (lookup-login-name uid) uid)
			     size
			     (decode-universal-time-for-files mtime year)
			     slash-name)))
		  (t (format t "Couldn't stat ~A -- ~A.~%"
			     slash-name
			     (mach:get-unix-error-msg dev-or-err))))))))))

(defun decode-universal-time-for-files (time current-year)
  (multiple-value-bind (sec min hour day month year)
		       (decode-universal-time (+ time unix-to-universal-time))
    (declare (ignore sec))
    (format nil "~A ~2,' D ~:[ ~D~;~*~2,'0D:~2,'0D~]"
	    (svref '#("Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug"
		      "Sep" "Oct" "Nov" "Dec")
		   (1- month))
	    day (= current-year year) year hour min)))

(defun print-directory-formatted (pathname all return-list)
  (let ((width (or (line-length *standard-output*) 80))
	(names ())
	(cnt 0)
	(max-len 0)
	(result ()))
    (declare (list names) (fixnum max-len cnt))
    ;;
    ;; Get the data.
    (multiple-value-bind (dir pattern) (find-directory pathname)
      (declare (ignore dir))
      (do-directory (name etype pattern all)
	(let* ((slash-name (if (eql etype :entry_file)
			       name
			       (concatenate 'simple-string name "/")))
	       (len (length slash-name)))
	  (declare (simple-string slash-name)
		   (fixnum len))
	  (when return-list
	    (push (pathname (concatenate 'simple-string
					 (directory-namestring pattern)
					 slash-name))
		  result))