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+;;;; app.lisp -- definition of CLI options and entry point.
+
+;; 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/>.
+
+(defpackage #:oneliners.cli.app
+  (:use #:cl #:net.didierverna.clon)
+  (:local-nicknames (#:a #:alexandria)
+                    (#:cli #:oneliners.cli)))
+
+(in-package :oneliners.cli.app)
+
+;;; VERSION
+(defparameter +ol-version+ "0.6.0")
+
+;;; HELP TEXTS
+(defparameter +invite-help-text+
+  " 
+New contributor accounts are added to the your oneliners server by
+redeeming invite tokens.
+
+When the --redeem option is passed, the ARGS section is expected to be
+three items long, and is interpreted as TOKEN USERNAME PASSWORD. E.g.:
+
+    ol --redeem PHONEYTOKEN c00lhacker my1337pw 
+
+Would attempt to make a new user named c00lhacker with password
+my1337pw.")
+
+(defparameter +oneliners-variables-help-text+
+"
+Oneliners may contain variables.  There are positional variables and
+named variables.
+
+POSITIONAL VARIABLES appear in the oneliner as a # followed by a
+number, which must 1 or greater.  For example:
+
+    echo Hello #1, Happy #2
+
+The #1 and #2 are a positional variables. You might call the above
+like
+
+   ol --run 8 Doofus Tuesday
+
+Assuming that the above oneliner has ID 8, then \"Hello Doofus,
+ Happy Tuesday\" would print to the console.
+
+NAMED VARIABLES are similar. They appear in the oneliner as # followed
+by a letter in the Roman alphabet, followed by any sequence of Roman
+letters, numbers, or the symbol _.  For example:
+
+   echo Hello #name you get a #thing
+
+The #name and #thing are named variables. You might call the above like so:
+
+  ol --run 3 name=Goober thing='sock in the nose'
+
+Which should print \"Hello Goober you get a sock in the nose\".
+
+Finally, you can MIX POSITIONAL AND NAMED VARIABLES so long as, when
+you run the oneliner, all positional variables appear first.
+")
+
+(defparameter +configure-your-edtior+
+  "Adding explainations for oneliners, either with --add or --edit,
+will use a default system editor. If you do not like the default
+editor you may configure it by the exporting the EDITOR environment
+variable to whatever you prefer.
+
+E.g. in your .bashrc you might put 
+
+export EDITOR=/usr/bin/zile 
+
+")
+
+
+;;; CLON SYNOPSIS DEFINITION 
+
+(defsynopsis (:postfix "[ARGUMENTS ...]")
+  (group (:header "SEARCH OPTIONS")
+         (text :contents "By default, ARGUMENTS are interpeted as search terms for oneliners. For example:")
+         (text :contents "$ ol grep awk   # search for oneliners involving both grep and awk")
+         (text :contents " ")
+
+         (lispobj :long-name "limit" 
+                  :argument-type :optional
+                  :argument-name "NUMBER"
+                  :default-value 10
+                  :description "The maximum number of results to return."
+                  :typespec 'integer)
+         (flag :long-name "all-flagged"
+               :description "Request that only flagged oneliners are returned. Without any ARGUMENTS, simply returns all flagged oneliners.")
+         (flag :long-name "not-flagged"
+               :description "Request that no flagged oneliners are returned with the search results. Does nothing without ARGUMENTS")
+         (flag :long-name "newest"
+               :description "Return newest oneliners that match. Without any ARGUMENTS, simply returns the newest oneliners."))
+  (text :contents " ")
+  (group (:header "EXECUTION OPTIONS")
+         (text :contents "Several options override the default interpretation of ARGUMENTS.")
+         (text :contents "Execution options interpret the first argument as the identifier of a oneliner: ")
+         (text :contents "$ ol <EXECUTION OPTION> <NAME or ID> [MORE ARGUMENTS...]")
+         (text :contents " ")
+         (flag :long-name "run"
+               :description "Executes a oneliner by NAME or ID. See also help topic 'variables'.")
+         (flag :long-name "clip"
+               :description "Like --run, but puts the oneliner into the clipboard."))
+  (text :contents " ")
+  (group (:header "OTHER OPTIONS") 
+         (flag :long-name "show"
+               :description "View all information for the oneliner given by NAME or ID")         
+         (lispobj :long-name "timeout"
+                  :argument-type :optional
+                  :argument-name "SECONDS"
+                  :default-value 2
+                  :typespec 'integer 
+                  :description "How long to wait for standard output before giving up."))
+  (text :contents " ")
+  (group (:header "HELP OPTIONS")
+         (flag :long-name "whois"
+               :description "View information about a contributor. The first argument is a contributor handle.")
+         (flag :long-name "help" 
+               :description "Print help for a topic. Topics:  wiki, account, invites, variables, editor")
+         (flag :long-name "version"
+               :description "Print the client's version"))
+  (group (:header "Advanced Options" :hidden t)
+         (flag :long-name "clear-cache"
+               :description "Clears all cached search results from your system."))
+  (group (:header "Editor" :hidden t)
+         (text :contents +configure-your-edtior+))
+  (group (:header "Variables" :hidden t)
+         (text :contents +oneliners-variables-help-text+))
+  (group (:header "Wiki" :hidden t)
+         (text :contents "Options For Managing Oneliners")
+         (flag :long-name "add"
+               :description  "Intaractively add a oneliner and update the wiki.")
+         (flag :long-name "edit"
+               :description "Interactively edit a oneliner and update the wiki.")
+         (flag :long-name "flag"
+               :description "Flag a oneliner for review.")
+         (flag :long-name "unflag"
+               :description "If you have admin priviliges, unflag a oneliner.")
+         (flag :long-name "lock"
+               :description "If you have admin priviliges, lock a oneliner from being edited.")
+         (flag :long-name "unlock"
+               :description "If you have admin priviliges, unlock a oneliner."))
+  (group (:header "Account" :hidden t)
+         (text :contents "Options for Managing Your Contributor Account")
+         (flag :long-name "login"
+               :description "Attempt to login to your contributor account. ARGS are interpreted as USERNAME PASSWORD.")
+         (flag :long-name "logout"
+               :description "Revoke your own access token.")
+         (flag :long-name "change-password"
+               :description "Change your password. ARGS are interpreted as CURRENTPW NEWPW NEWPWAGAIN")
+         (flag :long-name "change-signature"
+               :description "Change your contributor signature. You will be prompted."))
+  (group (:header "Invites" :hidden t)
+         (text :contents " ")
+         (text :contents "Options For Making Invites and Redeeming Tokens")
+         (flag :long-name "invite"
+               :description "Request an invite token to send to a friend.")
+         (flag :long-name "redeem"
+               :description "Redeem an invite token.")
+         (text :contents +invite-help-text+)))
+
+;;; HELPERS
+
+(defun find-group-with-header (header)
+  "This function should be built in. Is it? How to know? The
+documentation is both extensive and trash.  Any manual that expects
+you to go to sleep with it at night is written for the author more
+than the users."
+  (loop for item in (net.didierverna.clon::items *synopsis*)
+        when (and (typep item 'net.didierverna.clon::group)
+                  (string-equal header (net.didierverna.clon::header item)))
+          return item))
+
+
+;;; MAIN ENTRY POINT
+
+(defun prepare-oneliner-arguments (arguments)
+  "Takes a list of arguments, as gathered by (REMAINDER), and returns
+  a list that looks like (ID-OR-NAME . ARGS) where ID-OR-NAME is
+  either an integer or a string."
+  (a:if-let (id (parse-integer (first arguments) :junk-allowed t))
+    (cons id (rest arguments))
+    arguments))
+
+(defun main ()
+  "Entry point for our standalone application."
+  (make-context)
+  (handler-case
+      (let ((arguments (remainder)))
+        (cond
+          ((getopt :long-name "version")
+           (format t "Oneliner CLI Version: ~a~%" +ol-version+))
+          ((getopt :long-name "help")
+           (if (and arguments (find-group-with-header (first arguments)))
+               (help :item (find-group-with-header (first arguments)))
+               (help))
+           (uiop:quit))
+          ((getopt :long-name "whois")
+           (assert (first arguments) () "--whois requires an argument, a user handle.")
+           (cli::show-contributor (first arguments)))
+          
+          ((getopt :long-name "redeem")
+           (assert (= 3 (length arguments)) () "--redeem requires exatly three arguments.")
+           (destructuring-bind (token name pass) arguments
+             (cli::redeem-invite token name pass)))
+
+          ((getopt :long-name "login")
+           (assert (= 2 (length arguments)) () "--login requires exactly two arguments.")
+           (destructuring-bind (user pass) arguments
+             (cli::login user pass)))
+
+          ((getopt :long-name "change-password")
+           (assert (= 3 (length arguments)) () "--change-password requires exactly three arguments." )
+           (destructuring-bind (current new repeated) arguments
+             (cli::change-pw current new repeated)))
+          
+          ((getopt :long-name "change-signature")
+           (cli::change-signature))
+
+          ((getopt :long-name "invite")
+           (cli::request-invite-code))
+
+          ((getopt :long-name "logout")
+           (cli::revoke-access))
+
+          ((getopt :long-name "add")
+           (cli::add-new-oneliner))
+
+          ((and (null arguments) (getopt :long-name "all-flagged"))
+           (cli::all-flagged-oneliners (getopt :long-name "limit")))
+
+          ((and (null arguments) (getopt :long-name "newest"))
+           (cli::newest-oneliners (getopt :long-name "limit")))
+
+          ((getopt :long-name "clear-cache")
+           (cli::wipe-cache))
+
+          (arguments
+           (destructuring-bind (id-or-name . args) (prepare-oneliner-arguments arguments) 
+             (cond
+               ((getopt :long-name "flag")
+                (cli::flag-item id-or-name ))
+               ((getopt :long-name "unflag")
+                (cli::unflag-item id-or-name))
+               ((getopt :long-name "lock")
+                (cli::lock-item id-or-name ))
+               ((getopt :long-name "unlock")
+                (cli::unlock-item id-or-name ))
+               ((getopt :long-name "edit")
+                (cli::edit-item id-or-name ))
+               ((getopt :long-name "show")
+                (cli::print-item-explanation id-or-name))
+               ((getopt :long-name "clip")
+                (cli::run-item id-or-name args
+                               :force-clip t
+                               :timeout (getopt :long-name "timeout")))
+               ((getopt :long-name "run")
+                (cli::run-item id-or-name args
+                               :timeout (getopt :long-name "timeout")))
+               (t 
+                (cli::search-for-oneliners arguments
+                                           (getopt :long-name "limit")
+                                           (getopt :long-name "not-flagged")
+                                           (getopt :long-name "all-flagged")
+                                           (getopt :long-name "newest")))))
+           (uiop:quit))
+          (t
+           (help)))
+        (uiop:quit))
+    (error (e)
+      (format *error-output* "~%ERROR: ~a~%" e)
+      (uiop:quit))
+    (#+sbcl sb-sys:interactive-interrupt
+     #+ccl ccl:interrupt-signal-condition
+     #+ecl ext:interactive-interrupt
+     ()
+      (format t "Aborted by User Interrupt.~%")
+      (uiop:quit))))