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hpath.el
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;;; hpath.el --- GNU Hyperbole support routines for handling POSIX and MSWindows paths -*- lexical-binding: t; -*-
;;
;; Author: Bob Weiner
;;
;; Orig-Date: 1-Nov-91 at 00:44:23
;; Last-Mod: 7-Mar-25 at 00:22:47 by Mats Lidell
;;
;; SPDX-License-Identifier: GPL-3.0-or-later
;;
;; Copyright (C) 1991-2024 Free Software Foundation, Inc.
;; See the "HY-COPY" file for license information.
;;
;; This file is part of GNU Hyperbole.
;;; Commentary:
;;; Code:
;;; ************************************************************************
;;; Other required Elisp libraries
;;; ************************************************************************
(require 'cl-lib)
(require 'hact)
(require 'seq) ;; For seq-find
(require 'subr-x) ;; For string-trim
(require 'hversion) ;; for (hyperb:window-system) definition
(require 'hui-select) ;; for `hui-select-markup-modes'
(require 'tramp)
(unless (fboundp 'br-in-browser)
;; Then the OO-Browser is not loaded, so we can never be within the
;; browser. Define this as a dummy function that always returns nil
;; until the OO-Browser is ever loaded.
(defun br-in-browser ()
"Always returns nil since the OO-Browser is not loaded."
nil))
;;; ************************************************************************
;;; Public Variables
;;; ************************************************************************
(defcustom hpath:auto-completing-read-modes '(helm-mode ivy-mode selectrum-mode)
"*List of boolean mode variables whose modes automatically list completions.
These are modes where completions are listed without the need for
pressing the ? key."
:type '(repeat variable)
:group 'hyperbole-commands)
(defvar hpath:auto-variable-alist
'(("\\.el[cn]?\\'" . load-path)
("\\.org\\'" . org-directory)
("\\.py\\'" . "PYTHONPATH"))
"Alist of filename patterns and related variables to prepend to resolve them.
Each element looks like FILENAME-REGEXP . LISP-VARIABLE-OR-ENV-VARIABLE-STR.
The VARIABLE value may be: a directory path, a list of directory paths
or a colon or semicolon delimited string of directory paths.")
(defcustom hpath:find-file-urls-mode nil
"Set to t to enable use of ftp and http urls in file finding commands.
Requires that a remote file access library is available.
Default is nil since this can slow down normal file finding."
:type 'boolean
:initialize #'custom-initialize-default
:set (lambda (_symbol _value) (call-interactively #'hpath:find-file-urls-mode))
:group 'hyperbole-buttons)
(defconst hpath:line-and-column-numbers
":L?\\([-+]?[0-9]+\\)\\(:C?\\([-+]?[0-9]+\\)\\)?"
"Regexp matching a line number and optional column number.
Path, line and column numbers are colon separated. Group 1 is the
1-based line number. Group 3 is the 0-based column number.")
(defconst hpath:line-and-column-regexp
(concat hpath:line-and-column-numbers "\\s-*\\'")
"Regexp matching a trailing line number and optional column number.
Path, line and column numbers are colon separated. Group 1 is the
1-based line number. Group 3 is the 0-based column number.")
(defconst hpath:instance-line-column-regexp
":I\\([-+]?[0-9]+\\)\\(:L?\\([-+]?[0-9]+\\)\\)?\\(:C?\\([-+]?[0-9]+\\)\\)?\\s-*\\'"
"Regexp matching a trailing instance, optional line, and column number.
Path, instance, line, and column numbers are colon separated. Group 1
is the instance/occurrence number when searching from the buffer start.
Group 3 is the 1-based line number. Group 5 is the 0-based column number.")
(defconst hpath:markup-link-anchor-regexp
"\\`\\(#?[^#+]*[^#+.]\\)?\\(#\\)\\([^\]\[#+^{}<>\"`'\\\n\t\f\r]*\\)"
"Regexp matching a filename followed by a hash (#) and an optional anchor name.
The anchor is an in-file reference. # is group 2. Group 3 is the anchor
name.")
(defvar hpath:path-variable-regexp "\\`\\$?[{(]?\\([-_A-Z]*path[-_A-Z]*\\)[)}]?\\'"
"Regexp that matches exactly to a standalone path variable name reference.
Group 1 is the variable name.")
(defvar hpath:path-variable-value-regexp
(let* ((posix-separators ":;")
(windows-separators ";")
(reserved-chars "<>:\"|?*")
(exclude-space "\t\n\r\f")
(control-chars "[:cntrl:]")
;; Posix char set to exclude from paths
(nope (concat "\[^" posix-separators reserved-chars exclude-space control-chars "\]+"))
;; Windows char set to exclude from paths
(nowin (concat "\[^" windows-separators reserved-chars exclude-space control-chars "\]+")))
(concat "\\`\\.?:" nope ":" nope ":\\|:\\.?:" nope ":\\|:" nope ":" nope ":\\|:" nope ":" nope ":\\.?\\'"
"\\|"
"\\`\\.?;" nowin ";" nowin ";\\|;\\.?;\\|;" nowin ";" nowin ";\\|;" nowin ";" nowin ";\\|;" nowin ";" nowin ";\\.?\\'"))
;; A zero-length (null) directory name in the value of PATH indicates the current directory.
;; A null directory name may appear as two adjacent colons, or as an initial or trailing colon.
"Regexp that heuristically matches to Posix or Windows path variable values.
Posix has colon-separated and Windows has semicolon-separated
path variable values.")
(defconst hpath:section-line-and-column-regexp
"\\([^ \t\n\r\f:][^\t\n\r\f:]+\\(:[^0-9\t\n\r\f]*\\)*\\):L?\\([0-9]+\\)\\(:C?\\([0-9]+\\)\\)?$"
"Regexp that matches to a path with optional #section and :line:col.
Grouping 1 is path, grouping 3 is line number, grouping 4 is column
number. Allow for \\='c:' single letter drive prefixes on MSWindows and
Elisp vars with colons in them. Line and column can include a leading
and optional character, L for line and C for column.")
(defconst hpath:variable-regexp "\\$@?\{\\([^\}]+\\)@?\}"
"Regexp matching variable names that Hyperbole resolves within pathnames.
The format is ${variable}. Match grouping 1 is the name of the variable.")
;;; ************************************************************************
;;; Public Declarations
;;; ************************************************************************
(declare-function br-quit "ext:br")
(declare-function br-in-browser "ext:br")
(declare-function br-to-view-window "ext:br")
(declare-function mm-mailcap-command "mm-decode")
(declare-function hypb:decode-url "hypb")
(declare-function hattr:get "hbut")
(declare-function kbd-key:key-series-to-events "hib-kbd")
(declare-function hbut:label-to-key "hbut")
(declare-function hbut:key-to-label "hbut")
(declare-function hargs:delimited "hargs")
(declare-function hypb:object-p "hypb")
(declare-function Info-find-node "info")
(declare-function kcell-view:indent "kcell-view")
(declare-function klink:act "klink")
;;; ************************************************************************
;;; MS WINDOWS PATH CONVERSIONS
;;; ************************************************************************
;; This section adds automatic recognition of MSWindows implicit path
;; links and converts disk drive and path separators to whatever
;; format is needed by the underlying OS upon which Emacs is one,
;; notably either for POSIX or MSWindows (with no POSIX layer).
;; Especially useful when running Emacs under Windows Subsystem for
;; Linux (WSL) where the system-type variable is gnu/linux but
;; MSWindows is underneath so the user likely has many Windows
;; formatted links.
;; See "https://docs.microsoft.com/en-us/dotnet/standard/io/file-path-formats"
;; and "https://docs.microsoft.com/en-us/windows/wsl/interop" for
;; Windows path specifications and use under WSL.
(defvar hpath:posix-mount-points-regexp
"^\\(Filesystem\\|rootfs\\|none\\) "
"Regexp of \\='mount' output lines that are not mount points of MSWindows paths.")
(defvar hpath:mswindows-mount-prefix
(cond ((eq system-type 'cygwin)
"/cygdrive/")
(hyperb:microsoft-os-p
"")
(t ;; POSIX
"/mnt/"))
"Path prefix to add when converting MSWindows drive paths to POSIX-style.
Must include a trailing directory separator or be nil.")
(defconst hpath:mswindows-drive-regexp (format "\\`\\(%s\\)?[\\/]?\\([a-zA-Z]\\)[:\\/]"
hpath:mswindows-mount-prefix)
"Regular expression matching an MSWindows drive letter.
Matches at the beginning of a path string. Grouping 2 is the
actual letter of the drive. If the value of
`hpath:mswindows-mount-prefix' changes, then re-initialize this
constant.")
(defconst hpath:mswindows-path-regexp "\\`.*\\.*[a-zA-Z0-9_.]"
"Regexp matching the start of an MSWindows path without a drive letter.
Path contains directory separators.")
;;;###autoload
(defvar hpath:posix-mount-point-to-mswindows-alist nil
"Automatically set alist of (posix-mount-point . window-path-prefix) elements.
Used to expand posix mount points to Windows UNC paths during
posix-to-mswindows conversion.")
;;;###autoload
(defun hpath:mswindows-to-posix (path)
"Convert a MSWindows PATH to a Posix-style path or return the path unchanged.
If path begins with an MSWindows drive letter, prefix the
converted path with the value of `hpath:mswindows-mount-prefix'."
(interactive "sMSWindows path to convert to POSIX: ")
(when (and (stringp path) (not (equal path "\\\\")))
(setq path (hpath:mswindows-to-posix-separators path))
(when (string-match hpath:mswindows-drive-regexp path)
(when (string-match hpath:mswindows-drive-regexp path)
(let* ((drive-prefix (downcase (match-string 2 path)))
(rest-of-path (substring path (match-end 0)))
(absolute-p (and (not (string-empty-p rest-of-path))
(= (aref rest-of-path 0) ?/))))
;; Convert MSWindows disk drive paths to POSIX-style with a mount prefix.
(setq path (concat hpath:mswindows-mount-prefix drive-prefix
(cond (hyperb:microsoft-os-p ":")
(absolute-p "")
(t "/"))
rest-of-path))))))
path)
(defun hpath:mswindows-to-posix-separators (path)
"Replace backslashes with forward slashes and abbreviate the PATH if possible.
Path must be a string or an error will be triggered. See
`abbreviate-file-name' for how path abbreviation is handled."
(setq path (replace-regexp-in-string "\\\\" "/" path)
;; Downcase any host and domain for mount-point matching
path (if (string-match "\\`//[^/:]+" path)
(concat (downcase (match-string 0 path))
(substring path (match-end 0)))
path)
path (hpath:abbreviate-file-name path)
path (replace-regexp-in-string (regexp-quote "\\`") "" path)
path (replace-regexp-in-string (regexp-quote "\\>") "" path)))
;;;###autoload
(defun hpath:posix-to-mswindows (path)
"Convert a Posix-style PATH to an MSWindows path or return the path unchanged.
If path begins with an optional mount prefix,
`hpath:mswindows-mount-prefix', followed by an MSWindows drive
letter, remove the mount prefix."
(interactive "sPOSIX path to convert to MSWindows: ")
(when (stringp path)
(setq path (hpath:posix-to-mswindows-separators path))
;; Remove any POSIX mount prefix preceding an MSWindows path.
(if (eq 0 (string-match hpath:mswindows-mount-prefix path))
(setq path (substring path (match-end 0))))
(when (string-match hpath:mswindows-drive-regexp path)
(when (string-match hpath:mswindows-drive-regexp path)
(let* ((drive-prefix (downcase (match-string 2 path)))
(rest-of-path (substring path (match-end 0)))
(absolute-p (= (aref path (1- (match-end 0))) ?\\)))
;; Convert formerly Posix-style Windows disk drive paths to MSWindows-style.
(setq path (concat drive-prefix ":"
(if (or (not absolute-p)
(string-match "\\`[~/]" rest-of-path))
""
"\\")
rest-of-path))))))
path)
(defun hpath:posix-to-mswindows-separators (path)
"Replace forward slashes with backslashes and abbreviate the PATH if possible.
Path must be a string or an error will be triggered. See
`abbreviate-file-name' for how path abbreviation is handled."
(let ((directory-abbrev-alist hpath:posix-mount-point-to-mswindows-alist))
(replace-regexp-in-string "/" "\\\\" (hpath:abbreviate-file-name path))))
(defun hpath:posix-path-p (path)
"Return non-nil if PATH looks like a Posix path."
(and (stringp path) (string-match "/" path)))
;;;###autoload
(defun hpath:substitute-posix-or-mswindows-at-point ()
"If point is in a Posix or MSWindows path, change the path to the other type."
(interactive "*")
(barf-if-buffer-read-only)
(let* ((opoint (point))
(str-and-positions (hpath:delimited-possible-path t t))
(path (car str-and-positions))
(start (nth 1 str-and-positions))
(end (nth 2 str-and-positions)))
(when path
(if (hpath:posix-path-p path)
(setq path (hpath:posix-to-mswindows path))
(setq path (hpath:mswindows-to-posix path)))
(delete-region start end)
(insert path)
(goto-char (min opoint (point-max))))))
;;;###autoload
(defun hpath:substitute-posix-or-mswindows (path)
"Change a recognizable Posix or MSWindows PATH to the other type of path."
(when (stringp path)
(if (hpath:posix-path-p path)
(hpath:posix-to-mswindows path)
(hpath:mswindows-to-posix path))))
;;;###autoload
(defun hpath:cache-mswindows-mount-points ()
"Cache valid MSWindows mounts when under a non-MSWindows OS, e.g. WSL.
Mount points are cached in `directory-abbrev-alist'.
Call this function manually if mount points change after Hyperbole is loaded."
(interactive)
(when (not hyperb:microsoft-os-p)
(let (mount-points-to-add)
;; Convert plist to alist for sorting.
(hypb:map-plist (lambda (path mount-point)
(when (string-match "\\`\\([a-zA-Z]\\):\\'" path)
(setq path (concat "/" (match-string 1 path))))
;; Drive letter must be downcased
;; in order to work when converted back to Posix.
;; Assume all mounted Windows paths are
;; lowercase for now.
(setq path (downcase path))
(push (cons (downcase path) mount-point)
mount-points-to-add)
;; If a network share with a domain
;; name, also add an entry WITHOUT the
;; domain name to the mount points
;; table since Windows paths often omit
;; the domain.
(when (string-match "\\`\\([\\/][\\/][^.\\/]+\\)\\([^\\/]+\\)" path)
(push (cons (concat (match-string 1 path)
(substring path (match-end 0)))
mount-point)
mount-points-to-add)))
;; Return a plist of MSWindows path-mounted mount-point pairs.
;; Next call will raise an error if default-directory is set to
;; a URL, e.g. in RFC buffers; just ignore it and return nil in
;; such a case.
(ignore-errors
(split-string (shell-command-to-string (format "df -a -t drvfs 2> /dev/null | sort | uniq | grep -v '%s' | sed -e 's+ .*[-%%] /+ /+g'" hpath:posix-mount-points-regexp)))))
;; Sort alist of (path-mounted . mount-point) elements from shortest
;; to longest path so that the longest path is selected first within
;; 'directory-abbrev-alist' (elements are added in reverse order).
(setq mount-points-to-add
(sort mount-points-to-add
(lambda (cons1 cons2) (<= (length (car cons1)) (length (car cons2))))))
(let (path
mount-point)
(mapc (lambda (path-and-mount-point)
(setq path (car path-and-mount-point)
mount-point (cdr path-and-mount-point))
;; Don't abbreviate /mnt or /cygdrive to /, skip this entry.
(unless (equal mount-point "/")
(add-to-list 'directory-abbrev-alist (cons (format "\\`%s\\>" (regexp-quote path))
mount-point))))
mount-points-to-add))
;; Save the reverse of each mount-points-to-add so
;; can expand paths when going from posix-to-mswindows.
(setq hpath:posix-mount-point-to-mswindows-alist
(mapcar (lambda (elt) (cons (concat "\\`" (cdr elt) "\\>")
(car elt))) mount-points-to-add))
mount-points-to-add)))
;;; ************************************************************************
;;; FILE VIEWER COMMAND SETTINGS
;;; ************************************************************************
(defcustom hpath:external-open-office-suffixes "doc[mx]?\\|od[st]\\|ppsx?\\|ppt[mx]?\\|v[dst][s]?[tx]\\|vsd[x]?\\|xls[mx]?"
"*Regexp of Open Office document suffix alternatives.
These are to be display externally with the Action Key
Do not include an initial period or enclosing grouping parentheses;
these will be added automatically.
See http://www.openwith.org/programs/openoffice for a full list of
possible suffixes."
:type 'string
:group 'hyperbole-commands)
(defcustom hpath:external-file-suffixes "e?ps\\|dvi\\|pdf\\|ps\\.g?[zZ]\\|gif\\|tiff?\\|xpm\\|xbm\\|xwd\\|pm\\|pbm\\|jpe?g\\|ra?s\\|xcf"
"*Non-operating system dependent regexp of file suffixes to open outside Emacs.
These are opened with the Action Key when not handled by
`hpath:native-image-suffixes'. Do not include an initial period
or enclosing grouping parentheses; these will be added
automatically."
:type 'string
:group 'hyperbole-commands)
(defcustom hpath:external-display-alist-macos (list (cons (format "\\.\\(%s\\|%s\\|app\\|adaptor\\|bshlf\\|clr\\|concur\\|create\\|diagram\\|dp\\|frame\\|locus\\|Mesa\\|nib\\|project\\|rtf\\|sense\\|tree\\)$"
hpath:external-open-office-suffixes
hpath:external-file-suffixes)
"open"))
"*An alist of (FILENAME-REGEXP . DISPLAY-PROGRAM-STRING-OR-LIST) for the macOS.
See the function `hpath:get-external-display-alist' for detailed
format documentation."
:type '(alist :key-type regexp :value-type string)
:group 'hyperbole-commands)
(defcustom hpath:external-display-alist-mswindows (list (cons (format "\\.\\(%s\\)$" hpath:external-open-office-suffixes)
"openoffice.exe")
(cons (format "\\.\\(%s\\|vba\\)$" hpath:external-file-suffixes)
"/c/Windows/System32/cmd.exe //c start \"${@//&/^&}\""))
"*An alist of (FILENAME-REGEXP . DISPLAY-PROGRAM-STRING-OR-LIST) for MS Windows.
See the function `hpath:get-external-display-alist' for detailed
format documentation."
:type '(alist :key-type regexp :value-type string)
:group 'hyperbole-commands)
;; Old X Window System configuration prior to use of 'xdg-open'.
;; (defvar hpath:external-display-alist-x (list '("\\.e?ps$" . "ghostview")
;; '("\\.dvi$" . "xdvi")
;; (cons (format "\\.\\(%s\\)$" hpath:external-open-office-suffixes) "openoffice")
;; '("\\.pdf$" . ("xpdf" "acroread"))
;; '("\\.ps\\.g?[zZ]$" . "zcat %s | ghostview -")
;; '("\\.\\(gif\\|tiff?\\|xpm\\|xbm\\|xwd\\|pm\\|pbm\\|jpe?g\\)" . "xv")
;; '("\\.ra?s$" . "snapshot -l"))
(defcustom hpath:external-display-alist-x (list (cons (format "\\.\\(%s\\|%s\\)$"
hpath:external-open-office-suffixes
hpath:external-file-suffixes)
"setsid -w xdg-open"))
"*An alist of (FILENAME-REGEXP . DISPLAY-PROGRAM-STRING-OR-LIST) for X.
See the function `hpath:get-external-display-alist' for detailed
format documentation."
:type '(alist :key-type regexp :value-type string)
:group 'hyperbole-commands)
(defvar hpath:info-suffix "\\.info\\(-[0-9]+\\)?\\(\\.gz\\|\\.Z\\|-z\\)?\\'"
"Regexp matching to the end of Info manual file names.")
(defcustom hpath:internal-display-alist
(delq
nil
(list
;; Support internal sound when available.
(if (fboundp 'play-sound-file)
'("\\.\\(au\\|mp3\\|ogg\\|wav\\)$" . play-sound-file))
;; Run the OO-Browser on OOBR or OOBR-FTR Environment files.
'("\\(\\`\\|/\\)\\(OOBR\\|oobr\\).*\\(-FTR\\|-ftr\\)?\\'" . br-env-browse)
;; Display the top node from Info online manuals.
(cons
(concat hpath:info-suffix
"\\|/\\(info\\|INFO\\)/[^.]+$\\|/\\(info-local\\|INFO-LOCAL\\)/[^.]+$")
(lambda (file)
(when (and (string-match hpath:info-suffix file)
(match-beginning 1))
;; Removed numbered trailer to get basic filename.
(setq file (concat (substring-no-properties file 0 (match-beginning 1))
(substring-no-properties file (match-end 1)))))
;; Ensure that Info files with non-absolute directories outside of the
;; `Info-directory-list' are resolved properly, e.g. "man/hyperbole.info".
(unless (file-name-absolute-p file)
(setq file (expand-file-name "man/hyperbole.info")))
(require 'info)
;; Ensure that *info* buffer is displayed in the right place.
(hpath:display-buffer (current-buffer))
(condition-case ()
(Info-find-node file "Top")
(error (if (and file (file-exists-p file))
(progn
(if (get-buffer "*info*")
(kill-buffer "*info*"))
(Info-find-node file "*" nil t))
(error "Invalid file"))))))
'("\\.rdb\\'" . rdb:initialize)))
"*Alist for calling special functions to display file types in Emacs.
The alist consists of (FILENAME-REGEXP . EDIT-FUNCTION) elements.
See also the function (hpath:get-external-display-alist) for
external display program settings."
:type '(alist :key-type regexp :value-type sexp)
:group 'hyperbole-commands)
(defvar hpath:display-buffer-alist
(list
(list 'this-window #'switch-to-buffer)
(list 'other-window (lambda (b)
(if (br-in-browser)
(progn (br-to-view-window)
(switch-to-buffer b))
(switch-to-buffer-other-window b))))
(list 'one-window (lambda (b)
(when (br-in-browser)
(br-quit))
(delete-other-windows)
(switch-to-buffer b)))
(list 'new-frame (lambda (b)
;; Give temporary modes such as isearch a chance to turn off.
(run-hooks 'mouse-leave-buffer-hook)
(select-frame (make-frame (frame-parameters)))
(switch-to-buffer b)))
(list 'other-frame #'hpath:display-buffer-other-frame)
(list 'other-frame-one-window (lambda (b)
(prog1 (hpath:display-buffer-other-frame b)
(delete-other-windows)))))
"*Alist of (DISPLAY-WHERE-SYMBOL DISPLAY-BUFFER-FUNCTION) elements.
This permits fine-grained control of where Hyperbole displays linked to buffers.
The default value of DISPLAY-WHERE-SYMBOL is given by `hpath:display-where'.
Valid DISPLAY-WHERE-SYMBOLs are:
this-window - display in the current window
other-window - display in another window in the current frame
one-window - display in the current window, deleting other
windows
new-frame - display in a new frame
other-frame - display in another, possibly existing, frame
other-frame-one-window - display in another frame, deleting other windows.")
(defvar hpath:display-where 'other-window
"Symbol specifying the default method to use to display Hyperbole link referents.
See documentation of `hpath:display-where-alist' for valid values.
See Info node `(elisp)Choosing Window Options' for where Emacs displays buffers.")
(defvar hpath:display-where-alist
(list
(list 'this-window #'find-file)
(list 'other-window (lambda (f)
(if (br-in-browser)
(progn (br-to-view-window)
(find-file f))
(find-file-other-window f))))
(list 'one-window (lambda (f)
(if (br-in-browser) (br-quit))
(delete-other-windows)
(find-file f)))
(list 'new-frame (lambda (f)
(if (fboundp 'find-file-new-frame)
(find-file-new-frame f)
(hpath:find-other-frame f))))
(list 'other-frame #'hpath:find-other-frame)
(list 'other-frame-one-window (lambda (f)
(prog1 (hpath:find-other-frame f)
(delete-other-windows)))))
"*Alist of (DISPLAY-WHERE-SYMBOL DISPLAY-FILE-FUNCTION) elements.
This permits fine-grained control of where Hyperbole displays
linked to files. The default value of DISPLAY-WHERE-SYMBOL is
given by `hpath:display-where'.
Valid DISPLAY-WHERE-SYMBOLs are:
this-window - display in the current window
other-window - display in another window in the current frame
one-window - display in current window, deleting other windows
new-frame - display in a new frame
other-frame - display in another, possibly existing, frame
other-frame-one-window - display in another frame, deleting other windows.")
(defcustom hpath:native-image-suffixes "\\.\\(xbm\\|xpm\\|xwd\\|png\\|gif\\|jpe?g\\)\\'"
"Regular expression matching file name suffixes of images to display in Emacs.
Used only if the function `image-mode' is defined."
:type 'regexp
:group 'hyperbole-commands)
;;; ************************************************************************
;;; LINK PATH VARIABLE SUBSTITUTION SETTINGS
;;; ************************************************************************
;; The following variable permits sharing of links over wide areas, where
;; links may contain variable references whose values may differ between
;; link creator and link activator.
;;
;; When a link is created, if its path contains a match for any of the
;; variable values in hpath:variables, then the variable's symbol
;; surrounded by ${ } delimiters is substituted for the literal value.
;; Hyperbole then replaces the variable with a matching value when the
;; link is later resolved.
;;
(defcustom hpath:variables
'(hyperb:dir hywiki-directory load-path exec-path Info-directory-list sm-directory)
"*List of Emacs Lisp variable symbols to substitute within matching link paths.
Each variable value, if bound, must be either a pathname or a list of pathnames.
When embedded within a path, the format is ${variable}."
:type '(repeat variable)
:group 'hyperbole-commands)
;;; ************************************************************************
;;; Other public variables
;;; ************************************************************************
(defvar hpath:rfc "https://www.ietf.org/rfc/rfc%s.txt"
"*Url pattern for (hpath:rfc rfc-num) to get the RFC document for `rfc-num'.")
(defcustom hpath:suffixes '(".gz" ".Z")
"*List of filename suffixes to add or remove within hpath calls.
Used by `hpath:exists-p' and `hpath:substitute-dir'."
:type '(repeat string)
:group 'hyperbole-commands)
(defvar hpath:tmp-prefix "/tmp/remote-"
"*Pathname prefix for use with external viewers.
The prefix is attached to remote files when copied locally for viewing.")
;; WWW URL format: [URL[:=]]<protocol>:/[<user>@]<domain>[:<port>][/<path>]
;; or [URL[:=]]<protocol>://[<user>@]<domain>[:<port>][<path>]
;; or URL[:=][<user>@]<domain>[:<port>][<path>] (no protocol specified)
;; Avoid [a-z]:/path patterns since these may be disk paths on OS/2, DOS or
;; Windows.
(defvar hpath:url-regexp "<?\\(URL[:=]\\)?\\(\\([a-zA-Z][a-zA-Z]+\\)://?/?\\([^/:@ \t\n\r\"`'|]+@\\)?\\([^/:@ \t\n\r\"`'|]+\\)\\(\\)\\(:[0-9]+\\)?\\([/~]\\([^\]\[ \t\n\r\"`'|(){}<>]+[^\]\[ \t\n\r\"`'|(){}<>.,?#!*]\\)*\\)?\\)>?"
"Regular expression which matches a Url in a string or buffer.
Its match groupings and their names are:
1 = hpath:url-keyword-grpn = optional `URL:' or `URL=' literal
2 = hpath:url-grpn = the whole URL
3 = hpath:protocol-grpn = access protocol
4 = hpath:username-grpn = optional username
5 = hpath:sitename-grpn = URL site to connect to
6 = unused = for compatibility with hpath:url-regexp2
7 = hpath:portnumber-grpn = optional port number to use
8 = hpath:pathname-grpn = optional pathname to access.")
(defvar hpath:url-hostnames-regexp "\\(www\\|s?ftp\\|telnet\\|news\\|nntp\\)"
"Regexp group of hostnames that contains the Url access protocol to use.")
(defvar hpath:url-regexp2
(concat
"<?\\(URL[:=]\\|[^/@]\\|\\)\\(\\(\\)\\(\\)\\("
hpath:url-hostnames-regexp
"\\.[^/:@ \t\n\r\"`'|]+\\):?\\([0-9]+\\)?\\([/~]\\([^\]\[ \t\n\r\"`'|(){}<>]+[^\]\[ \t\n\r\"`'|(){}<>.,?#!*]\\)*\\)?\\)>?")
"Regular expression which matches a Url in a string or buffer.
Its match groupings and their names are:
1 = hpath:url-keyword-grpn = optional `URL:' or `URL=' literal
2 = hpath:url-grpn = the whole URL
3 = unused = for compatibility with hpath:url-regexp
4 = unused = for compatibility with hpath:url-regexp
5 = hpath:sitename-grpn = URL site to connect to
6 = hpath:hostname-grpn = hostname used to determine the access
protocol, e.g. ftp.domain.com
7 = hpath:portnumber-grpn = optional port number to use
8 = hpath:pathname-grpn = optional pathname to access.")
(defvar hpath:url-regexp3
(concat
"<?\\(URL[:=]\\)\\(\\(\\)\\(\\)"
"\\([a-zA-Z0-9][^/:@ \t\n\r\"`'|]*\\.[^/:@ \t\n\r\"`'|]+\\)"
":?\\([0-9]+\\)?\\([/~]\\([^\]\[ \t\n\r\"`'|(){}<>]+[^\]\[ \t\n\r\"`'|(){}<>.,?#!*]\\)*\\)?\\)>?")
"Regular expression which matches a Url in a string or buffer.
Its match groupings and their names are:
1 = hpath:url-keyword-grpn = required `URL:' or `URL=' literal
2 = hpath:url-grpn = the whole URL
3 = unused = for compatibility with hpath:url-regexp
4 = unused = for compatibility with hpath:url-regexp
5 = hpath:sitename-grpn = URL site to connect to
6 = hpath:hostname-grpn = hostname used to determine the access
protocol, e.g. ftp.domain.com
7 = hpath:portnumber-grpn = optional port number to use
8 = hpath:pathname-grpn = optional pathname to access.")
(defconst hpath:url-keyword-grpn 1
"Optional `URL:' or `URL=' literal.
See doc for `hpath:url-regexp' and `hpath:url-regexp[2,3]'.")
(defconst hpath:url-grpn 2
"The whole URL. See doc for `hpath:url-regexp' and `hpath:url-regexp[2,3]'.")
(defconst hpath:protocol-grpn 3
"Access protocol. See doc for `hpath:url-regexp' and `hpath:url-regexp[2,3]'.")
(defconst hpath:username-grpn 4
"Optional username. See doc for `hpath:url-regexp' and `hpath:url-regexp[2,3]'.")
(defconst hpath:sitename-grpn 5
"URL site to connect to.
See doc for `hpath:url-regexp' and `hpath:url-regexp[2,3]'.")
(defconst hpath:hostname-grpn 6
"Hostname used to determine the access protocol, e.g. sftp.domain.com.
See doc for `hpath:url-regexp' and `hpath:url-regexp[2,3]'.")
(defconst hpath:portnumber-grpn 7
"Optional port number to use.
See doc for `hpath:url-regexp' and `hpath:url-regexp[2,3]'.")
(defconst hpath:pathname-grpn 8
"Optional pathname to access.
See doc for `hpath:url-regexp' and `hpath:url-regexp[2,3]'.")
(defvar hpath:string-url-regexp (concat "\\`" hpath:url-regexp "\\'")
"Regexp that matches to a possibly delimited Url and nothing else.
See the documentation for `hpath:url-regexp' for match groupings to
use with `string-match'.")
(defvar hpath:string-url-regexp2 (concat "\\`" hpath:url-regexp2 "\\'")
"Regexp that matches to a possibly delimited terse Url and nothing else.
See the documentation for `hpath:url-regexp' for match groupings to
use with `string-match'.")
(defvar hpath:string-url-regexp3 (concat "\\`" hpath:url-regexp3 "\\'")
"Regexp that matches to a possibly delimited terse Url and nothing else.
See the documentation for `hpath:url-regexp' for match groupings to
use with `string-match'.")
;;; ************************************************************************
;;; Private variables
;;; ************************************************************************
(defconst hpath:html-anchor-id-pattern "\\(id\\|name\\)=['\"]%s['\"]?"
"Regexp matching an html anchor id definition.
Contains a %s for replacement of a specific anchor id.")
(defconst hpath:markdown-anchor-id-pattern "^[ ]*%s: "
"Regexp matching a Markdown anchor id definition.
Contains a %s for replacement of a specific anchor id.")
(defconst hpath:markdown-section-pattern "^[ \t]*\\(#+\\|\\*+\\)[ \t]+%s\\([\[<\({ \t[:punct:]]*\\)$"
"Regexp matching a Markdown section header.
Contains a %s for replacement of a specific section name.")
(defconst hpath:markdown-suffix-regexp "\\.[mM][dD]"
"Regexp that matches to a Markdown file suffix.")
(defconst hpath:outline-section-pattern "^\\*+[ \t]+%s[ \t]*\\([\[<\({[:punct:]]+\\|$\\)"
"Bol-anchored, no leading spaces regexp matching an Emacs outline section header.
Contains a %s for replacement of a specific section name.")
(defvar hpath:prefix-regexp "\\`[-!&][ ]*"
"Regexp matching command characters which may precede a pathname.
These are used to indicate how to display or execute the pathname.
- means evaluate it as Emacs Lisp;
! means execute it as a shell script
& means run it under the current window system.")
(defvar hpath:remote-regexp
"\\`/[^/:]+:\\|\\`s?ftp[:.]\\|\\`www\\.\\|\\`https?:"
"Regexp matching remote pathnames and urls which invoke remote file handlers.")
(defconst hpath:shell-modes '(sh-mode csh-mode shell-script:mode)
"List of modes for editing shell scripts where # is a comment character.")
(defconst hpath:texinfo-section-pattern "^@node+[ \t]+%s[ \t]*\\(,\\|$\\)"
"Regexp matching a Texinfo section header.
Contains a %s for replacement of a specific section name.")
;;; ************************************************************************
;;; Public functions
;;; ************************************************************************
(defun hpath:abbreviate-file-name (path)
"Return a version of PATH shortened using `directory-abbrev-alist'.
Same as `abbreviate-file-name' but disables `tramp-mode'. This
prevents improper processing of hargs with colons in them,
e.g. `actypes::link-to-file'."
(let (tramp-mode)
(abbreviate-file-name path)))
(defun hpath:absolute-arguments (actype arg-list &optional default-dirs)
"Return any paths in ACTYPE's ARG-LIST made absolute.
Uses optional DEFAULT-DIRS (a list of dirs or a single dir) or
`default-directory'. Other arguments are returned unchanged."
(let ((param-list (delq nil (mapcar (lambda (param)
(when param
(setq param (symbol-name param))
(unless (= ?& (aref param 0))
param)))
(action:params (actype:action actype))))))
;; Extend param-list to length of arg-list in case of any &rest param.
(setq param-list
(nconc param-list
(make-list (max 0 (- (length arg-list) (length param-list)))
(last param-list))))
(cl-mapcar (lambda (param arg)
(if (and (stringp param)
(or (string-match-p "file" param)
(string-match-p "dir" param)
(string-match-p "path" param)))
(hpath:absolute-to arg default-dirs)
arg))
param-list arg-list)))
(defun hpath:absolute-to (path &optional default-dirs)
"Return PATH as an absolute path relative to one directory.
Search optional DEFAULT-DIRS or `default-directory'.
Return PATH unchanged when it is absolute, a buffer name, not a valid path,
or when DEFAULT-DIRS is invalid. DEFAULT-DIRS when non-nil may be a single
directory or a list of directories. The first one in which PATH is found is
used."
(if (not (stringp path))
path
(hpath:call
(lambda (path non-exist)
(when (stringp path)
(setq path (hpath:trim path)))
(cond ((not (and (stringp path)
(not (hypb:object-p path))
(setq path (hpath:expand path))
(not (get-buffer path))
(not (file-name-absolute-p path))
(hpath:is-p path nil non-exist)))
path)
((not (cond ((null default-dirs)
(setq default-dirs (cons default-directory nil)))
((stringp default-dirs)
(setq default-dirs (cons default-dirs nil)))
((listp default-dirs))
(t nil)))
path)
(t
(let ((rtn) dir)
(while (and default-dirs (null rtn))
(setq dir (expand-file-name
(file-name-as-directory (car default-dirs)))
rtn (expand-file-name path dir)
default-dirs (cdr default-dirs))
(unless (file-exists-p rtn)
(setq rtn nil)))
(or rtn path)))))
path 'allow-spaces)))
(defun hpath:tramp-file-name-regexp ()
"Return a regexp for matching to the beginning of a remote file name.
Modifies `tramp-file-name-regexp' by removing bol anchor and
match to empty string if present."
(let* ((tramp-localname-regexp "[^[:cntrl:]]*\\'")
(tramp-regexp (car (if (fboundp 'tramp-file-name-structure)
(tramp-file-name-structure)
tramp-file-name-structure))))
(replace-regexp-in-string
"\\\\'" ""
(cond ((string-match-p "\\\\(\\?:^/\\\\)" tramp-regexp)
(replace-regexp-in-string "\\\\(\\?:\\^/\\\\)" "\\(?:/\\)" tramp-regexp nil t))
(t (substring tramp-regexp 1))))))
(defun hpath:remote-at-p ()
"Return a remote pathname that point is within or nil.
See the `(Emacs)Remote Files' info documentation for pathname format details.
Always returns nil if (hpath:remote-available-p) returns nil."
(let ((remote-package (hpath:remote-available-p))
(user (hpath:remote-default-user))
path
path-no-site)
(when remote-package
(setq path
(save-excursion
(skip-chars-backward "^[ \t\n\r\f\"`'|\(\{<")
(cond
((and (eq remote-package 'tramp)
(looking-at (hpath:tramp-file-name-regexp)))
(match-string-no-properties 0))
((looking-at hpath:url-regexp)
(if (string-match-p "\\`s?ftp\\'" (match-string-no-properties hpath:protocol-grpn))
(concat
(format "/%s:" (match-string-no-properties hpath:protocol-grpn))
;; user
(if (match-beginning hpath:username-grpn)
(match-string-no-properties hpath:username-grpn)
(concat user "@"))
;; sitename
(hpath:delete-trailer
(match-string-no-properties hpath:sitename-grpn))
":"
;; path
(if (match-beginning hpath:pathname-grpn)
(match-string-no-properties hpath:pathname-grpn)))
;; else ignore this other type of WWW path
))
((or (looking-at hpath:url-regexp2)
(looking-at hpath:url-regexp3))
(if (string-match-p "\\`s?ftp\\'" (match-string-no-properties hpath:hostname-grpn))
(concat
(format "/%s:" (match-string-no-properties hpath:hostname-grpn))
user "@"
;; site
(hpath:delete-trailer
(match-string-no-properties hpath:sitename-grpn))
":"
;; path
(if (match-beginning hpath:pathname-grpn)
(match-string-no-properties hpath:pathname-grpn)))
;; else ignore this other type of WWW path
))
;; user, site and path
((looking-at "/?[^/:@ \t\n\r\"`'|]+@[^/:@ \t\n\r\"`'|]+:[^]@ \t\n\r\"`'|\)\}]+")
(match-string-no-properties 0))
;; @site and path
((looking-at "@[^/:@ \t\n\r\"`'|]+:[^]@:, \t\n\r\"`'|\)\}]+")
(concat "/" user (match-string-no-properties 0)))
;; site and path
((and (looking-at
"/?\\(\\([^/:@ \t\n\r\"`'|]+\\):\\([^]@:, \t\n\r\"`'|\)\}]+\\)\\)[] \t\n\r,.\"`'|\)\}]")
(setq path (match-string-no-properties 1) ;; includes site
path-no-site (match-string-no-properties 3))
(string-match "[^.]\\.[^.]" (match-string-no-properties 2))
(not (string-match "\\(\\`\\|:\\)[:0-9]+\\'" path-no-site))) ;; prevent matching to line:col suffixes
(concat "/" user "@" path))
;; host and path
((and (looking-at "/\\([^/:@ \t\n\r\"`'|]+:[^]@:, \t\n\r\"`'|\)\}]+\\)")
(setq path (match-string-no-properties 1)))
(concat "/" user "@" path)))))
(hpath:delete-trailer path))))
(defun hpath:remote-p (path)
"Return a normalized form of PATH if a remote, non-local, pathname, else nil.
See the `(Tramp)Top' Emacs Lisp package manual for remote
pathname format details. Always returns nil
if (hpath:remote-available-p) returns nil."
(and (stringp path)
(let ((remote-package (hpath:remote-available-p))
(user (hpath:remote-default-user))
result)
(setq result
(cond
((null remote-package) nil)
((eq remote-package 'tramp)
(if (tramp-tramp-file-p path) path))
((string-match hpath:string-url-regexp path)
(if (string-match-p "\\`s?ftp\\'" (match-string-no-properties hpath:protocol-grpn path))
(concat
"/"
;; user
(if (match-beginning hpath:username-grpn)
(match-string-no-properties hpath:username-grpn path)
(concat user "@"))
;; site
(hpath:delete-trailer
(match-string-no-properties hpath:sitename-grpn path))
":"
;; path
(if (match-beginning hpath:pathname-grpn)
(match-string-no-properties hpath:pathname-grpn path)))
;; else ignore this other type of WWW path
))
((or (string-match hpath:string-url-regexp2 path)
(string-match hpath:string-url-regexp3 path))
(if (string-match-p "\\`s?ftp\\'"
(match-string-no-properties hpath:hostname-grpn path))
(concat
"/" user "@"
;; site
(hpath:delete-trailer
(match-string-no-properties hpath:sitename-grpn path))
":"
;; path
(if (match-beginning hpath:pathname-grpn)
(match-string-no-properties hpath:pathname-grpn path)))
;; else ignore this other type of WWW path
))
;; user, site and path
((string-match "/?[^/:@ \t\n\r\"`'|]+@[^/:@ \t\n\r\"`'|]+:[^]@ \t\n\r\"`'|\)\}]*"
path)
(match-string-no-properties 0 path))
;; @site and path
((string-match "@[^/:@ \t\n\r\"`'|]+:[^]@ \t\n\r\"`'|\)\}]*"
path)
(concat "/" user (match-string-no-properties 0 path)))
;; site and path
((and (string-match
"/?\\(\\([^/:@ \t\n\r\"`'|]+\\):[^]@:, \t\n\r\"`'|\)\}]*\\)"
path)
(setq result (match-string-no-properties 1 path))
(string-match "[^.]\\.[^.]"
(match-string-no-properties 2 path)))
(concat "/" user "@" result))
;; host and path
((and (string-match
"/\\([^/:@ \t\n\r\"`'|]+:[^]@:, \t\n\r\"`'|\)\}]*\\)"
path)
(setq result (match-string-no-properties 1 path)))
(concat "/" user "@" result))))
(hpath:delete-trailer result))))
(defun hpath:at-p (&optional type non-exist)
"Return delimited path or non-delimited remote path at point, if any.
Path is expanded and normalized. See `hpath:is-p' for how the path
is normalized.
World-Wide Web urls are ignored and therefore dealt with by other
code. Delimiters may be: double quotes, open and close single
quote, whitespace, or Texinfo file references. If optional TYPE
is the symbol \\='file or \\='directory, then only that path type
is accepted as a match. Only locally reachable paths are checked
for existence. With optional NON-EXIST, nonexistent local paths
are allowed. Absolute pathnames must begin with a `/' or `~'."
(let ((path (hpath:delimited-possible-path non-exist))
subpath)
(when path
(setq path (string-trim path)))
(when (and path (not non-exist) (string-match hpath:prefix-regexp path)
(not (string-equal (match-string 0 path) path)))
(setq non-exist t))
(if (and path (not (string-empty-p path)) (file-readable-p path))
path
(unless (and path (or (string-empty-p path)
(string-match "::" path)))
(cond ((and path
;; Don't allow more than one set of grouping chars
(not (string-match-p "\)\\s-*\(\\|\\]\\s-*\\[\\|\}\\s-*\{" path))
;; With point inside a path variable, return the path that point is on or to the right of.
(setq subpath (or (and (setq subpath (hargs:delimited "[:\"\']\\|^\\s-*" "[:\"\']\\|\\s-*$" t t nil "[\t\n\r\f]\\|[;:] \\| [;:]"))
(not (string-match-p "[:;\t\n\r\f]" subpath))
subpath)
(and (setq subpath (hargs:delimited "[;\"\']\\|^\\s-*" "[;\"\']\\|\\s-*$" t t nil "[\t\n\r\f]\\|[;:] \\| [;:]"))
(not (string-match-p "[;\t\n\r\f]\\|:[^:]*:" subpath))
subpath)))
;; Handle anchored or action prefix char paths in the
;; following clause; otherwise, might just be looking
;; at part of the path
(and subpath (not (or (string-match-p "#" subpath)
(string-match-p hpath:prefix-regexp subpath))))
(setq subpath
(if subpath
(cond ((and (string-match "\\`\\s-*\\([^; \t]+\\)" subpath)
(executable-find (match-string 1 subpath)))
;; Could be a shell command from a semicolon separated
;; list; ignore if so
nil)
(t (expand-file-name subpath)))
;; Only default to current path if know are within a PATH value
(when (string-match-p hpath:path-variable-value-regexp path)
".")))
(hpath:is-p subpath type non-exist))
subpath)
((hpath:is-p path type non-exist))
;; Local file URLs
;; ((hpath:is-p (hargs:delimited "file://" "[ \t\n\r\"\'\}]" nil t)))