;;; pcvs-info.el --- internal representation of a fileinfo entry  -*- lexical-binding: t; -*-

;; Copyright (C) 1991-2022 Free Software Foundation, Inc.

;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Keywords: pcl-cvs
;; Package: pcvs

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; The cvs-fileinfo data structure:
;;
;; When the `cvs update' is ready we parse the output.  Every file
;; that is affected in some way is added to the cookie collection as
;; a "fileinfo" (as defined below in cvs-create-fileinfo).

;;; Code:

(eval-when-compile (require 'cl-lib))
(require 'pcvs-util)
;;(require 'pcvs-defs)

;;;;
;;;; config variables
;;;;

(defcustom cvs-display-full-name t
  "Specifies how the filenames should be displayed in the listing.
If non-nil, their full filename name will be displayed, else only the
non-directory part."
  :group 'pcl-cvs
  :type '(boolean))

(defcustom cvs-allow-dir-commit nil
  "Allow `cvs-mode-commit' on directories.
If you commit without any marked file and with the cursor positioned
on a directory entry, cvs would commit the whole directory.  This seems
to confuse some users sometimes."
  :group 'pcl-cvs
  :type '(boolean))

;;;;
;;;; Faces for fontification
;;;;

(defface cvs-header
  '((((class color) (background dark))
     (:foreground "lightyellow" :weight bold))
    (((class color) (background light))
     (:foreground "blue4" :weight bold))
    (t (:weight bold)))
  "PCL-CVS face used to highlight directory changes."
  :group 'pcl-cvs)

(defface cvs-filename
  '((((class color) (background dark))
     (:foreground "lightblue"))
    (((class color) (background light))
     (:foreground "blue4"))
    (t ()))
  "PCL-CVS face used to highlight file names."
  :group 'pcl-cvs)

(defface cvs-unknown
  '((((class color) (background dark))
     (:foreground "red1"))
    (((class color) (background light))
     (:foreground "red1"))
    (t (:slant italic)))
  "PCL-CVS face used to highlight unknown file status."
  :group 'pcl-cvs)

(defface cvs-handled
  '((((class color) (background dark))
     (:foreground "pink"))
    (((class color) (background light))
     (:foreground "pink"))
    (t ()))
  "PCL-CVS face used to highlight handled file status."
  :group 'pcl-cvs)

(defface cvs-need-action
  '((((class color) (background dark))
     (:foreground "orange"))
    (((class color) (background light))
     (:foreground "orange"))
    (t (:slant italic)))
  "PCL-CVS face used to highlight status of files needing action."
  :group 'pcl-cvs)

(defface cvs-marked
  '((((min-colors 88) (class color) (background dark))
     (:foreground "green1" :weight bold))
    (((class color) (background dark))
     (:foreground "green" :weight bold))
    (((class color) (background light))
     (:foreground "green3" :weight bold))
    (t (:weight bold)))
  "PCL-CVS face used to highlight marked file indicator."
  :group 'pcl-cvs)

(defface cvs-msg
  '((t :slant italic))
  "PCL-CVS face used to highlight CVS messages."
  :group 'pcl-cvs)

(defvar cvs-fi-up-to-date-face 'cvs-handled)
(defvar cvs-fi-unknown-face 'cvs-unknown)
(defvar cvs-fi-conflict-face 'font-lock-warning-face)

;; There is normally no need to alter the following variable, but if
;; your site has installed CVS in a non-standard way you might have
;; to change it.

(defvar cvs-bakprefix ".#"
  "The prefix that CVS prepends to files when rcsmerge'ing.")

(declare-function cvs-mode-toggle-mark "pcvs" (e))

(defvar-keymap cvs-status-map
  :doc "Local keymap for text properties of status."
  "<mouse-2>" #'cvs-mode-toggle-mark)

;; Constructor:

(cl-defstruct (cvs-fileinfo
	    (:constructor nil)
	    (:copier nil)
	    (:constructor -cvs-create-fileinfo (type dir file full-log
						     &key marked subtype
						     merge
						     base-rev
						     head-rev))
	    (:conc-name cvs-fileinfo->))
  marked	;; t/nil.
  type		;; See below
  subtype	;; See below
  dir		;; Relative directory the file resides in.
                ;; (concat dir file) should give a valid path.
  file	     	;; The file name sans the directory.
  base-rev      ;; During status: This is the revision that the
                ;; working file is based on.
  head-rev      ;; During status: This is the highest revision in
                ;; the repository.
  merge		;; A cons cell containing the (ancestor . head) revisions
		;; of the merge that resulted in the current file.
  ;;removed	;; t if the file no longer exists.
  full-log	;; The output from cvs, unparsed.
  ;;mod-time	;; Not used.

  ;; In addition to the above, the following values can be extracted:

  ;; handled    ;; t if this file doesn't require further action.
  ;; full-name  ;; The complete relative filename.
  ;; pp-name    ;; The printed file name
  ;; backup-file;; For MERGED and CONFLICT files after a \"cvs update\",
                ;; this is a full path to the backup file where the
                ;; untouched version resides.

  ;; The meaning of the type field:

  ;; Value	      ---Used by---	Explanation
  ;; 		      update status
  ;; NEED-UPDATE		x	file needs update
  ;; MODIFIED		x	x	modified by you, unchanged in repository
  ;;   MERGED		x	x	successful merge
  ;; ADDED		x	x	added by you, not yet committed
  ;; MISSING			x	rm'd, but not yet `cvs remove'd
  ;; REMOVED		x	x	removed by you, not yet committed
  ;; NEED-MERGE			x	need merge
  ;; CONFLICT		x		conflict when merging
  ;; ;;MOD-CONFLICT	x		removed locally, changed in repository.
  ;; DIRCHANGE		x	x	A change of directory.
  ;; UNKNOWN		x		An unknown file.
  ;; UP-TO-DATE			x	The file is up-to-date.
  ;;   UPDATED		x	x	file copied from repository
  ;;   PATCHED		x	x	diff applied from repository
  ;;   COMMITTED		x	x	cvs commit'd
  ;; DEAD				An entry that should be removed
  ;; MESSAGE		x	x	This is a special fileinfo that is used
  ;;					  to display a text that should be in
  ;;					  full-log."
  ;;   TEMP	A temporary message that should be removed
  )
(defun cvs-create-fileinfo (type dir file msg &rest keys)
  (cvs-check-fileinfo (apply #'-cvs-create-fileinfo type dir file msg keys)))

;; Fake selectors:

(defun cvs-fileinfo->full-name (fileinfo)
  "Return the full path for the file that is described in FILEINFO."
  (let ((dir (cvs-fileinfo->dir fileinfo)))
    (if (eq (cvs-fileinfo->type fileinfo) 'DIRCHANGE)
	(if (string= dir "") "." (directory-file-name dir))
      ;; Here, I use `concat' rather than `expand-file-name' because I want
      ;; the resulting path to stay relative if `dir' is relative.
      (concat dir (cvs-fileinfo->file fileinfo)))))

(defun cvs-fileinfo->pp-name (fi)
  "Return the filename of FI as it should be displayed."
  (if cvs-display-full-name
      (cvs-fileinfo->full-name fi)
    (cvs-fileinfo->file fi)))

(defun cvs-fileinfo->backup-file (fileinfo)
  "Construct the file name of the backup file for FILEINFO."
  (let* ((dir (cvs-fileinfo->dir fileinfo))
	 (file (cvs-fileinfo->file fileinfo))
	 (default-directory (file-name-as-directory (expand-file-name dir)))
	 (files (directory-files "." nil
				 (concat "\\`" (regexp-quote cvs-bakprefix)
					 (regexp-quote file) "\\(\\.[0-9]+\\.[0-9]+\\)+\\'")))
	 bf)
    (dolist (f files)
      (when (and (file-readable-p f)
		 (or (null bf) (file-newer-than-file-p f bf)))
	(setq bf f)))
    (concat dir bf)))

;; (defun cvs-fileinfo->handled (fileinfo)
;;   "Tell if this requires further action"
;;   (memq (cvs-fileinfo->type fileinfo) '(UP-TO-DATE DEAD)))


;; Predicate:

(defun cvs-check-fileinfo (fi)
  "Check FI's conformance to some conventions."
  (let ((check 'none)
	(type (cvs-fileinfo->type fi))
	(subtype (cvs-fileinfo->subtype fi))
	(marked (cvs-fileinfo->marked fi))
	(dir (cvs-fileinfo->dir fi))
	(file (cvs-fileinfo->file fi))
	(base-rev (cvs-fileinfo->base-rev fi))
	(head-rev (cvs-fileinfo->head-rev fi))
	(full-log (cvs-fileinfo->full-log fi)))
    (if (and (setq check 'marked)	(memq marked '(t nil))
	     (setq check 'base-rev)	(or (null base-rev) (stringp base-rev))
	     (setq check 'head-rev)	(or (null head-rev) (stringp head-rev))
	     (setq check 'full-log)	(stringp full-log)
	     (setq check 'dir)
	     (and (stringp dir)
		  (not (file-name-absolute-p dir))
		  (or (string= dir "")
		      (string= dir (file-name-as-directory dir))))
	     (setq check 'file)
	     (and (stringp file)
		  (string= file (file-name-nondirectory file)))
	     (setq check 'type)		(symbolp type)
	     (setq check 'consistency)
	     (pcase type
	       ('DIRCHANGE (and (null subtype) (string= "." file)))
	       ((or 'NEED-UPDATE 'ADDED 'MISSING 'DEAD 'MODIFIED 'MESSAGE
                    'UP-TO-DATE 'REMOVED 'NEED-MERGE 'CONFLICT 'UNKNOWN)
		t)))
	fi
      (error "Invalid :%s in cvs-fileinfo %s" check fi))))


;;;;
;;;; State table to indicate what you can do when.
;;;;

(defconst cvs-states
  `((NEED-UPDATE	update diff ignore)
    (UP-TO-DATE		update nil remove diff safe-rm revert)
    (MODIFIED		update commit undo remove diff merge diff-base)
    (ADDED		update commit remove)
    (MISSING     	remove undo update safe-rm revert)
    (REMOVED     	commit add undo safe-rm)
    (NEED-MERGE     	update undo diff diff-base)
    (CONFLICT		merge remove undo commit diff diff-base)
    (DIRCHANGE		remove update diff ,(if cvs-allow-dir-commit 'commit) tag)
    (UNKNOWN		ignore add remove)
    (DEAD		)
    (MESSAGE))
  "Fileinfo state descriptions for pcl-cvs.
This is an assoc list.  Each element consists of (STATE . FUNS):
- STATE (described in `cvs-create-fileinfo') is the key.
- FUNS is the list of applicable operations.
  The first one (if any) should be the \"default\" action.
Most of the actions have the obvious meaning.
`safe-rm' indicates that the file can be removed without losing
  any information.")

;;;;
;;;; Utility functions
;;;;

(defun cvs-applicable-p (fi-or-type func)
  "Check if FUNC is applicable to FI-OR-TYPE.
If FUNC is nil, always return t.
FI-OR-TYPE can either be a symbol (a fileinfo-type) or a fileinfo."
  (let ((type (if (symbolp fi-or-type) fi-or-type
		(cvs-fileinfo->type fi-or-type))))
    (and (not (eq type 'MESSAGE))
	 (eq (car (memq func (cdr (assq type cvs-states)))) func))))

(defun cvs-add-face (str face &optional keymap &rest props)
  (when keymap
    (when (keymapp keymap)
      (setq props `(keymap ,keymap ,@props)))
    (setq props `(mouse-face highlight ,@props)))
  (add-text-properties 0 (length str) `(font-lock-face ,face ,@props) str)
  str)

(defun cvs-fileinfo-pp (fileinfo)
  "Pretty print FILEINFO.  Insert a printed representation in current buffer.
For use by the ewoc package."
  (cvs-check-fileinfo fileinfo)
  (let ((type (cvs-fileinfo->type fileinfo))
	(subtype (cvs-fileinfo->subtype fileinfo)))
    (insert
     (pcase type
       ('DIRCHANGE (concat "In directory "
                           (cvs-add-face (cvs-fileinfo->full-name fileinfo)
                                         'cvs-header t 'cvs-goal-column t)
                           ":"))
       ('MESSAGE
	(cvs-add-face (format "Message: %s" (cvs-fileinfo->full-log fileinfo))
		      'cvs-msg))
       (_
	(let* ((status (if (cvs-fileinfo->marked fileinfo)
			   (cvs-add-face "*" 'cvs-marked)
			 " "))
	       (file (cvs-add-face (cvs-fileinfo->pp-name fileinfo)
				   'cvs-filename t 'cvs-goal-column t))
	       (base (or (cvs-fileinfo->base-rev fileinfo) ""))
	       (head (cvs-fileinfo->head-rev fileinfo))
	       (type
		(let ((str (pcase type
			     ;;(MOD-CONFLICT "Not Removed")
			     ('DEAD	  "")
			     (_ (capitalize (symbol-name type)))))
		      (face (let ((sym (intern-soft
					(concat "cvs-fi-"
						(downcase (symbol-name type))
						"-face"))))
			      (or (and (boundp sym) (symbol-value sym))
				  'cvs-need-action))))
		  (cvs-add-face str face cvs-status-map)))
	       (side (or
		      ;; maybe a subtype
		      (when subtype (downcase (symbol-name subtype)))
		      ;; or the head-rev
		      (when (and head (not (string= head base))) head)
		      ;; or nothing
		      "")))
	   (format "%-11s %s %-11s %-11s %s"
		   side status type base file))))
     "\n")))


(defun cvs-fileinfo-update (fi fi-new)
  "Update FI with the information provided in FI-NEW."
  (let ((type (cvs-fileinfo->type fi-new))
	(merge (cvs-fileinfo->merge fi-new)))
    (setf (cvs-fileinfo->type fi) type)
    (setf (cvs-fileinfo->subtype fi) (cvs-fileinfo->subtype fi-new))
    (setf (cvs-fileinfo->full-log fi) (cvs-fileinfo->full-log fi-new))
    (setf (cvs-fileinfo->base-rev fi) (cvs-fileinfo->base-rev fi-new))
    (setf (cvs-fileinfo->head-rev fi) (cvs-fileinfo->head-rev fi-new))
    (cond
     (merge (setf (cvs-fileinfo->merge fi) merge))
     ((memq type '(UP-TO-DATE NEED-UPDATE))
      (setf (cvs-fileinfo->merge fi) nil)))))

(defun cvs-fileinfo< (a b)
  "Compare fileinfo A with fileinfo B and return t if A is `less'.
The ordering defined by this function is such that directories are
sorted alphabetically, and inside every directory the DIRCHANGE
fileinfo will appear first, followed by all files (alphabetically)."
  (let (  ;; (subtypea (cvs-fileinfo->subtype a))
	) ;; (subtypeb (cvs-fileinfo->subtype b))
    (cond
     ;; Sort according to directories.
     ((string< (cvs-fileinfo->dir a) (cvs-fileinfo->dir b)) t)
     ((not (string= (cvs-fileinfo->dir a) (cvs-fileinfo->dir b))) nil)

     ;; The DIRCHANGE entry is always first within the directory.
     ((eq (cvs-fileinfo->type b) 'DIRCHANGE) nil)
     ((eq (cvs-fileinfo->type a) 'DIRCHANGE) t)

     ;; All files are sorted by file name.
     ((string< (cvs-fileinfo->file a) (cvs-fileinfo->file b))))))

;;;
;;; Look at CVS/Entries to quickly find a first approximation of the status
;;;

(defun cvs-fileinfo-from-entries (dir &optional all)
  "List of fileinfos for DIR, extracted from CVS/Entries.
Unless ALL is non-nil, returns only the files that are not up-to-date.
DIR can also be a file."
  (let* ((singlefile
	  (cond
	   ((equal dir "") nil)
	   ((file-directory-p dir) (setq dir (file-name-as-directory dir)) nil)
	   (t (prog1 (file-name-nondirectory dir)
		(setq dir (or (file-name-directory dir) ""))))))
	 (file (expand-file-name "CVS/Entries" dir))
	 (fis nil))
    (if (not (file-readable-p file))
	(push (cvs-create-fileinfo (if singlefile 'UNKNOWN 'DIRCHANGE)
				   dir (or singlefile ".") "") fis)
      (with-temp-buffer
	(insert-file-contents file)
	(goto-char (point-min))
	;; Select the single file entry in case we're only interested in a file.
	(cond
	 ((not singlefile)
	  (push (cvs-create-fileinfo 'DIRCHANGE dir "." "") fis))
	 ((re-search-forward
	   (concat "^[^/]*/" (regexp-quote singlefile) "/.*") nil t)
	  (setq all t)
	  (goto-char (match-beginning 0))
	  (narrow-to-region (point) (match-end 0)))
	 (t
	  (push (cvs-create-fileinfo 'UNKNOWN dir singlefile "") fis)
	  (narrow-to-region (point-min) (point-min))))
	(while (looking-at "\\([^/]*\\)/\\([^/]*\\)/\\([^/]*\\)/\\([^/]*\\)/")
	  (if (/= (match-beginning 1) (match-end 1))
	      (setq fis (append (cvs-fileinfo-from-entries
				 (concat dir (file-name-as-directory
					      (match-string 2)))
				 all)
				fis))
	    (let ((f (match-string 2))
		  (rev (match-string 3))
		  (date (match-string 4))
		  timestamp
		  (type 'MODIFIED)
		  (subtype nil))
	      (cond
	       ((equal (substring rev 0 1) "-")
		(setq type 'REMOVED rev (substring rev 1)))
	       ((not (file-exists-p (concat dir f))) (setq type 'MISSING))
	       ((equal rev "0") (setq type 'ADDED rev nil))
	       ((equal date "Result of merge") (setq subtype 'MERGED))
	       ((let ((mtime (file-attribute-modification-time
			      (file-attributes (concat dir f))))
		      (system-time-locale "C"))
		  (setq timestamp (format-time-string "%c" mtime t))
		  ;; Solaris sometimes uses "Wed Sep 05", not "Wed Sep  5".
		  ;; See "grep '[^a-z_]ctime' cvs/src/*.c" for reference.
		  (if (= (aref timestamp 8) ?0)
		      (setq timestamp (concat (substring timestamp 0 8)
					      " " (substring timestamp 9))))
		  (equal timestamp date))
		(setq type (if all 'UP-TO-DATE)))
	       ((equal date (concat "Result of merge+" timestamp))
		(setq type 'CONFLICT)))
	      (when type
		(push (cvs-create-fileinfo type dir f ""
					   :base-rev rev :subtype subtype)
		      fis))))
	  (forward-line 1))))
    fis))

(provide 'pcvs-info)

;;; pcvs-info.el ends here