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Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
270 lines
9.8 KiB
EmacsLisp
270 lines
9.8 KiB
EmacsLisp
;;; esh-opt.el --- command options processing -*- lexical-binding:t -*-
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;; Copyright (C) 1999-2017 Free Software Foundation, Inc.
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;; Author: John Wiegley <johnw@gnu.org>
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(provide 'esh-opt)
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(require 'esh-ext)
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;; Unused.
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;; (defgroup eshell-opt nil
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;; "The options processing code handles command argument parsing for
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;; Eshell commands implemented in Lisp."
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;; :tag "Command options processing"
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;; :group 'eshell)
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;;; User Functions:
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(defmacro eshell-eval-using-options (name macro-args options &rest body-forms)
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"Process NAME's MACRO-ARGS using a set of command line OPTIONS.
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After doing so, stores settings in local symbols as declared by OPTIONS;
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then evaluates BODY-FORMS -- assuming all was OK.
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OPTIONS is a list, beginning with one or more elements of the form:
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\(SHORT LONG VALUE SYMBOL HELP-STRING)
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Each of these elements represents a particular command-line switch.
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SHORT is either nil, or a character that can be used as a switch -SHORT.
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LONG is either nil, or a string that can be used as a switch --LONG.
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At least one of SHORT and LONG must be non-nil.
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VALUE is the value associated with the option. It can be either:
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t - the option needs a value to be specified after the switch;
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nil - the option is given the value t;
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anything else - specifies the actual value for the option.
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SYMBOL is either nil, or the name of the Lisp symbol that will be bound
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to VALUE. A nil SYMBOL calls `eshell-show-usage', and so is appropriate
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for a \"--help\" type option.
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HELP-STRING is a documentation string for the option.
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Any remaining elements of OPTIONS are :KEYWORD arguments. Some take
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arguments, some do not. The recognized :KEYWORDS are:
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:external STRING
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STRING is an external command to run if there are unknown switches.
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:usage STRING
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STRING is the initial part of the command's documentation string.
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It appears before the options are listed.
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:post-usage STRING
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STRING is an optional trailing part of the command's documentation string.
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It appears after the options, but before the final part of the
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documentation about the associated external command (if there is one).
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:show-usage
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If present, then show the usage message if the command is called with no
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arguments.
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:preserve-args
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If present, do not pass MACRO-ARGS through `eshell-flatten-list'
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and `eshell-stringify-list'.
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For example, OPTIONS might look like:
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((?C nil nil multi-column \"multi-column display\")
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(nil \"help\" nil nil \"show this usage display\")
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(?r \"reverse\" nil reverse-list \"reverse order while sorting\")
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:external \"ls\"
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:usage \"[OPTION]... [FILE]...
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List information about the FILEs (the current directory by default).
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Sort entries alphabetically across.\")
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`eshell-eval-using-options' returns the value of the last form in
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BODY-FORMS. If instead an external command is run (because of
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an unknown option), the tag `eshell-external' will be thrown with
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the new process for its value.
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Lastly, any remaining arguments will be available in a locally
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interned variable `args' (created using a `let' form)."
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(declare (debug (form form sexp body)))
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`(let* ((temp-args
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,(if (memq ':preserve-args (cadr options))
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macro-args
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(list 'eshell-stringify-list
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(list 'eshell-flatten-list macro-args))))
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(processed-args (eshell--do-opts ,name ,options temp-args))
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,@(delete-dups
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(delq nil (mapcar (lambda (opt)
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(and (listp opt) (nth 3 opt)
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`(,(nth 3 opt) (pop processed-args))))
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;; `options' is of the form (quote OPTS).
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(cadr options))))
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(args processed-args))
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,@body-forms))
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;;; Internal Functions:
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;; Documented part of the interface; see eshell-eval-using-options.
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(defvar eshell--args)
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(defun eshell--do-opts (name options args)
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"Helper function for `eshell-eval-using-options'.
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This code doesn't really need to be macro expanded everywhere."
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(let ((ext-command
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(catch 'eshell-ext-command
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(let ((usage-msg
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(catch 'eshell-usage
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(if (and (= (length args) 0)
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(memq ':show-usage options))
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(eshell-show-usage name options)
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(setq args (eshell--process-args name args options))
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nil))))
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(when usage-msg
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(error "%s" usage-msg))))))
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(if ext-command
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(throw 'eshell-external
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(eshell-external-command ext-command args))
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args)))
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(defun eshell-show-usage (name options)
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"Display the usage message for NAME, using OPTIONS."
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(let ((usage (format "usage: %s %s\n\n" name
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(cadr (memq ':usage options))))
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(extcmd (memq ':external options))
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(post-usage (memq ':post-usage options))
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had-option)
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(while options
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(when (listp (car options))
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(let ((opt (car options)))
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(setq had-option t)
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(cond ((and (nth 0 opt)
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(nth 1 opt))
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(setq usage
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(concat usage
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(format " %-20s %s\n"
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(format "-%c, --%s" (nth 0 opt)
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(nth 1 opt))
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(nth 4 opt)))))
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((nth 0 opt)
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(setq usage
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(concat usage
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(format " %-20s %s\n"
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(format "-%c" (nth 0 opt))
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(nth 4 opt)))))
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((nth 1 opt)
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(setq usage
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(concat usage
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(format " %-20s %s\n"
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(format " --%s" (nth 1 opt))
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(nth 4 opt)))))
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(t (setq had-option nil)))))
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(setq options (cdr options)))
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(if post-usage
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(setq usage (concat usage (and had-option "\n")
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(cadr post-usage))))
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(when extcmd
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(setq extcmd (eshell-search-path (cadr extcmd)))
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(if extcmd
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(setq usage
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(concat usage
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(format-message "
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This command is implemented in Lisp. If an unrecognized option is
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passed to this command, the external version `%s'
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will be called instead." extcmd)))))
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(throw 'eshell-usage usage)))
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(defun eshell--set-option (name ai opt options opt-vals)
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"Using NAME's remaining args (index AI), set the OPT within OPTIONS.
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If the option consumes an argument for its value, the argument list
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will be modified."
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(if (not (nth 3 opt))
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(eshell-show-usage name options)
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(setcdr (assq (nth 3 opt) opt-vals)
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(if (eq (nth 2 opt) t)
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(if (> ai (length eshell--args))
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(error "%s: missing option argument" name)
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(prog1 (nth ai eshell--args)
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(if (> ai 0)
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(setcdr (nthcdr (1- ai) eshell--args)
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(nthcdr (1+ ai) eshell--args))
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(setq eshell--args (cdr eshell--args)))))
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(or (nth 2 opt) t)))))
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(defun eshell--process-option (name switch kind ai options opt-vals)
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"For NAME, process SWITCH (of type KIND), from args at index AI.
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The SWITCH will be looked up in the set of OPTIONS.
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SWITCH should be either a string or character. KIND should be the
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integer 0 if it's a character, or 1 if it's a string.
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The SWITCH is then be matched against OPTIONS. If no matching handler
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is found, and an :external command is defined (and available), it will
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be called; otherwise, an error will be triggered to say that the
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switch is unrecognized."
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(let* ((opts options)
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found)
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(while opts
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(if (and (listp (car opts))
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(nth kind (car opts))
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(equal switch (nth kind (car opts))))
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(progn
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(eshell--set-option name ai (car opts) options opt-vals)
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(setq found t opts nil))
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(setq opts (cdr opts))))
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(unless found
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(let ((extcmd (memq ':external options)))
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(when extcmd
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(setq extcmd (eshell-search-path (cadr extcmd)))
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(if extcmd
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(throw 'eshell-ext-command extcmd)
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(error (if (characterp switch) "%s: unrecognized option -%c"
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"%s: unrecognized option --%s")
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name switch)))))))
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(defun eshell--process-args (name args options)
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"Process the given ARGS using OPTIONS."
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(let* ((seen ())
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(opt-vals (delq nil (mapcar (lambda (opt)
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(when (listp opt)
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(let ((sym (nth 3 opt)))
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(when (and sym (not (memq sym seen)))
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(push sym seen)
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(list sym)))))
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options)))
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(ai 0) arg
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(eshell--args args))
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(while (< ai (length args))
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(setq arg (nth ai args))
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(if (not (and (stringp arg)
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(string-match "^-\\(-\\)?\\(.*\\)" arg)))
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(setq ai (1+ ai))
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(let* ((dash (match-string 1 arg))
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(switch (match-string 2 arg)))
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(if (= ai 0)
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(setq args (cdr args))
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(setcdr (nthcdr (1- ai) args) (nthcdr (1+ ai) args)))
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(if dash
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(if (> (length switch) 0)
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(eshell--process-option name switch 1 ai options opt-vals)
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(setq ai (length args)))
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(let ((len (length switch))
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(index 0))
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(while (< index len)
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(eshell--process-option name (aref switch index)
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0 ai options opt-vals)
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(setq index (1+ index))))))))
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(nconc (mapcar #'cdr opt-vals) args)))
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;;; esh-opt.el ends here
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