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+;;;; main.lisp -- oneliners.cli entrypoint
+
+(defpackage oneliners.cli
+  (:use :cl)
+  (:local-nicknames (#:api #:oneliners.api-client)))
+(in-package :oneliners.cli)
+
+;;; CLI OPTIONS
+
+;; (opts:define-opts
+;;   (:name :add
+;;    :description "Intaractively add a oneliner to the a wiki."
+;;    :long "add")
+;;   (:name :tags
+;;    :description "A comma separated list of tags to filter search results."
+;;    :short #\t
+;;    :long "tags"
+;;    :arg-parser #'identity
+;;    :meta-var "'T1, T2, ...'")
+;;   (:name :limit
+;;    :description "An integer. The maximum number of results to return."
+;;    :short #\l
+;;    :long "limit"
+;;    :meta-var "N"
+;;    :default 10
+;;    :arg-parser #'parse-integer)
+;;   (:name :edit
+;;    :description "An integer, a result number. Interactively edit af command."
+;;    :long "edit"
+;;    :meta-var "RESULT"
+;;    :arg-parser #'parse-integer)
+;;   (:name :not-flagged
+;;    :description "Filter flagged oneliners from the search results"
+;;    :long "not-flagged"))
+
+(defparameter +help-suffix+
+  "Unless RESULT is an integer, search for oneliners that involve each command in COMMANDS.
+E.g. 
+    # search for oneliners involving both 'find' and 'grep'
+    ol find grep   
+
+Otherwise, when RESULT is an integer, run the oneliner with index RESULT from the most  
+recent search command, and supply ARGS to that oneliner, if provided.
+E.g. 
+    # run the third result from the last search with arguments foo and bar
+    ol 3 foo bar")
+
+;; (defun help-text ()
+;;   (opts:describe :prefix "Oneliners Wiki Command Line Tool" 
+;;                  :args "[[RESULT ARGS |  COMMANDS]" 
+;;                  :usage-of "ol"
+;;                  :suffix +help-suffix+))
+
+;;; CONFIG AND RESULTS FILE LOCATIONS
+
+(defun config-file ()
+  (merge-pathnames ".config/oneliners.config" (user-homedir-pathname)  ))
+
+(defun last-search-file ()
+  (merge-pathnames ".last_oneliners_search" (user-homedir-pathname)))
+
+;;; RUNNING COMMANDS
+
+(defun parent-process-name ()
+  "Prints the name of the parent process of the current process."
+  (let ((ppidfile (format nil "/proc/~a/status" (osicat-posix:getppid))))
+    (first (last 
+            (ppcre:split "\\s" 
+                         (with-open-file (input ppidfile)
+                           (read-line input)))))))
+
+(defmacro wait-until ((&key (timeout 1) (poll-every 0.01)) &body check)
+  "Run CHECK every POLL-EVERY seconds until either TIMEOUT seconds
+have passed or CHECK returns non-nil."
+  (let ((clockvar (gensym))
+        (var (gensym)))
+    `(loop
+       for ,clockvar from 0 by ,poll-every to ,timeout
+       for ,var = (progn ,@check)
+       when ,var
+         return ,var
+       do (sleep ,poll-every))))
+
+(defun run-with-shell
+    (command
+     &key
+       (shell-name (parent-process-name))
+       (await-output-p 0.8)
+       (output-stream *standard-output*))
+  "run COMMAND, a string, in a fresh shell environment, initialized
+with SHELL-NAME. The output from the command read line by line and is
+printed to OUTPUT-STREAM. "
+  (let ((shell
+          (uiop:launch-program shell-name :input :stream :output :stream)))
+    (symbol-macrolet ((shell-input (uiop:process-info-input shell))
+                      (shell-output (uiop:process-info-output shell)))
+      (write-line command shell-input)
+      (finish-output shell-input)
+      (when await-output-p
+        (wait-until (:timeout await-output-p :poll-every 0.005)
+          (listen shell-output))
+        (loop while (listen shell-output)
+              do (princ (read-line shell-output) output-stream)
+                 (terpri output-stream))))))
+
+;;; main
+
+;; (defun main ()
+;;   (handler-case 
+;;       (multiple-value-bind (options free-args) (opts:get-opts)
+;;         (print (list :options options :free-args free-args))
+;;         (terpri)
+;;         (uiop:quit))
+;;     (unix-opts:unknown-option (err)
+;;       (declare (ignore err))
+;;       (princ (help-text))
+;;       (terpri))))