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;;;; state.lisp -- functions for dealing with client state
;; Copyright (C) 2022 Colin Okay
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU Affero General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;; This program 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 Affero General Public License for more details.
;; You should have received a copy of the GNU Affero General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
(in-package :oneliners.cli)
;;; Config Struct
(defstruct config
handle
api-token
host
shell)
(defvar *config* nil
"Holds a config struct instance.")
(defvar *cache* nil
"Holds cached oneliners as a list.")
;;; LOADING AND SAVING STATE
(defun config-file ()
"Returns the pahtname holding the location of the config file."
(merge-pathnames ".config/oneliners.config" (user-homedir-pathname)))
(defun cached-oneliners-file ()
"Returns the pathname holding the location of the cache."
(merge-pathnames ".cache/oneliners.cache" (user-homedir-pathname)))
(defun wipe-cache ()
"Deletes the cache, if present."
(uiop:delete-file-if-exists (cached-oneliners-file)))
(defun write-config-to-disk ()
(print-to-file *config* (config-file)))
(defun write-cache-to-disk ()
(print-to-file *cache* (cached-oneliners-file)))
(defun read-config-file ()
"Read a configuration from the location returned by CONFIG-FILE. NIL
if there is no such file"
(read-from-file (config-file)))
(defun read-cache-file ()
"Read the cache from the location returned by
CACHED-ONELINERS-FILE. NIL if there is no such file."
(read-from-file (cached-oneliners-file)))
;;; GETTING AND SETTING STATE, DYNAMICALLY BOUND
(defun merge-oneliners (new)
"Modifies *CACHE*. Merge updated oneliners into the *cache*, ensuring to remove old versions."
(setf *cache*
(nconc
new
(delete-if
(lambda (old-oneliner)
(find (oneliner-id old-oneliner)
new
:key #'oneliner-id
:test #'equal))
*cache*))))
(defun get-cached (id-or-name)
"Looks up a oneliner instance by ID-OR-NAME using the current binding of *cache*. "
(find id-or-name
*cache*
:key (etypecase id-or-name
(integer #'oneliner-id)
(string #'oneliner-name))
:test #'equal))
;;; STATE LOADING MACRO
(defmacro with-local-state (&body body)
"Binds the *config* and *cache* dynamic variables from disk, and
sets the api's *host* variable. If BODY produces no errors, the "
`(let* ((*config* (read-config-file))
(*cache* (read-cache-file))
(api::*host* (config-host *config*)))
(assert *host* () "ol must be configured with a server host.")
(handler-case
(progn
,@body
;; only if there is no error do we save the local state.
(write-cache-to-disk)
(write-config-to-disk)))
(error (e)
(format *error-output* "~a~%" e))))
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