Tom Willemse
97d631db55
Practical Common Lisp suggested that most Lisp projects used Java-like naming schemes. I have not seen this happen in the real world so much.
200 lines
6.6 KiB
Common Lisp
200 lines
6.6 KiB
Common Lisp
;; Copyright (C) 2013 Tom Willemsen <tom at ryuslash dot org>
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;; This file is part of CLark
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;; CLark is free software: you can redistribute it and/or modify it
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;; 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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;; CLark is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; 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 CLark. If not, see <http://www.gnu.org/licenses/>.
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;;; Code:
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(in-package :clark)
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(defvar *db* nil
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"The database connection.")
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(defvar *help-messages* nil
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"Help texts for commands.")
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(defvar *max-command-name-length* 0
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"Length of the longest command name.")
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(defvar *script* nil
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"Whether or not to output in a machine-readable format.")
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(define-condition exiting ()
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((exit-code :initform 0 :initarg :code :reader exit-code)))
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(defmacro call-command (name &rest args)
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(let ((command-name (make-command-name (symbol-name name))))
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`(,command-name ,@args)))
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(defmacro defcommand (name (&rest args) sdoc ldoc &body body)
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"Define a new command usable on the command-line."
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(let* ((sname (string-downcase (symbol-name name)))
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(command-name (make-command-name (symbol-name name))))
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`(progn
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(defun ,command-name (,@args)
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,sdoc
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,@body)
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(setf *help-messages*
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(nconc *help-messages* '((,sname ,sdoc ,ldoc)))
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*max-command-name-length*
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(max *max-command-name-length* (length ,sname))))))
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(defmacro with-error-and-help (code cmd fmt &rest args)
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"Call `with-error-status' with CODE, format FMT with ARGS and call
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the help command."
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`(with-error-status ,code
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(format t ,fmt ,@args)
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(call-command help ,cmd)))
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(defmacro with-error-status (code &body body)
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"Bind `*exit-status*' to CODE, `*standard-output*' to
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`*error-output*' and execute BODY."
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`(let ((*standard-output* *error-output*)
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(exit-status ,code))
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,@body
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(when (> exit-status 0)
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(signal 'exiting :code exit-status))))
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(defparameter version "0.1.1"
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"Clark's version.")
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(defun add-tags (url-or-id tags)
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"Add tags to the bookmark_tag table and possibly to tag."
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(when url-or-id
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(if (integerp url-or-id)
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(map nil (lambda (tag)
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(let ((tag-id (handler-case (insert-tag tag)
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(sqlite-error () (get-tag-id tag)))))
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(insert-bookmark-tag url-or-id tag-id))) tags)
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(add-tags (get-bookmark-id url-or-id) tags))))
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(defun clear-tags (url-or-id)
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"Remove all tags from the bookmark URL."
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(when url-or-id
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(if (integerp url-or-id)
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(delete-tags url-or-id)
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(clear-tags (get-bookmark-id url-or-id)))))
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(defun ensure-db-exists (name)
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"Connect to the database, possibly creating it."
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(let ((db-exists (probe-file name)))
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(setf *db* (connect name))
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(unless db-exists
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(create-table-bookmark)
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(create-table-tag)
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(create-table-bookmark_tag))))
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(defun get-db-location ()
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"Get the location of the database."
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(let ((xdg (sb-ext:posix-getenv "XDG_DATA_HOME"))
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(home (sb-ext:posix-getenv "HOME")))
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(pathname
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(apply 'concatenate 'string
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(or xdg home)
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(unless xdg "/.local/share")
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'("/clark/bookmarks.db")))))
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(defun get-rc-location ()
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"Get the location of the RC file."
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(let ((xdg (sb-ext:posix-getenv "XDG_CONFIG_HOME"))
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(home (sb-ext:posix-getenv "HOME")))
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(pathname
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(apply 'concatenate 'string
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(or xdg home)
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(unless xdg "/.config")
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'("/clark/rc.lisp")))))
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(defun help-message ()
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(format t (concatenate
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'string
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"Usage: clark [options] [<command> [<options> ...]]~%"
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"~%"
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"Possible options:~%"
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"~%"
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" --script Output in a machine-readable format.~%"
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"~%"
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"Possible commands:~%"
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"~%"))
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(map nil (lambda (hlp)
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(destructuring-bind (name short long) hlp
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(declare (ignore long))
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(format t " ~vA ~A~%" *max-command-name-length*
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name short))) *help-messages*)
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(format t "~%~A~%"
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(concatenate 'string "Use `clark help <command>' to get more "
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"information on a command.")))
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(defun load-db ()
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"Load the database."
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(let ((db-location (get-db-location)))
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(ensure-directories-exist db-location)
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(ensure-db-exists db-location)))
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(defun load-rc ()
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"Load the RC file."
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(let ((*package* (in-package :clark)))
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(load (get-rc-location) :if-does-not-exist nil)))
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(eval-when (:compile-toplevel :load-toplevel :execute)
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(defun make-command-name (base)
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"Turn BASE into the name of a possible command."
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(intern (concatenate 'string (string-upcase base) "-COMMAND")
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:clark)))
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(defun parse-args (args)
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"Parse command-line arguments ARGS.
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The executable name should already have been removed."
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(loop while (and args (char= (char (car args) 0) #\-))
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do (case (intern (string-upcase (string-left-trim "-" (car args)))
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:clark)
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(script (setf *script* t args (cdr args)))
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(t (with-error-and-help
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1 "help" "Unknown option: ~a~%" (car args)))))
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(if args
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(let ((cmd-name (make-command-name (car args))))
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(if (fboundp cmd-name)
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(handler-case (apply cmd-name (cdr args))
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(sb-int:simple-program-error (err)
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(if (string-equal (format nil "~A" err)
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"invalid number of arguments" :end1 27)
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(with-error-and-help
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1 (car args) "Wrong number of arguments given.~%")
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(signal err))))
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(with-error-and-help
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1 "help" "Unknown command: ~A~%" (car args))))
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(map nil #'print-bookmark (bookmark-list))))
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(defun print-bookmark (bm)
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"Print information about bookmark BM.
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BM should be a list containing the url, name and description of the
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bookmark."
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(destructuring-bind (url name description) bm
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(if *script*
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(format t "~A ~A ~A " url name description)
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(format t "~A~% ~A~% ~A~%~%" url name description))))
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(defun clark (args)
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"Main function.
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Connect to the database, parse command-line arguments, execute and
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then disconnect."
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(load-rc)
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(load-db)
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(handler-case
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(unwind-protect (parse-args (cdr args))
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(disconnect *db*))
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(exiting (c) (sb-ext:exit :code (exit-code c)))))
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