64 lines
2.4 KiB
Common Lisp
64 lines
2.4 KiB
Common Lisp
(:eval-when (:compile-toplevel :load-toplevel)
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(ql:quickload :chirp))
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(defpackage :coleslaw-twitter
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(:use :cl)
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(:import-from :coleslaw
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:*config*
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:deploy
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:get-updated-files
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:page-url
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:plugin-conf-error)
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(:export #:enable))
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(in-package :coleslaw-twitter)
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(defvar *tweet-format* '("~A by ~A" coleslaw::post-title coleslaw::post-author)
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"Controls what the tweet annoucing the post looks like. It contains a format
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control string followed with the accesors to evaluate for post.")
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(defun enable (&key api-key api-secret access-token access-secret tweet-format)
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(if (and api-key api-secret access-token access-secret)
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(setf chirp:*oauth-api-key* api-key
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chirp:*oauth-api-secret* api-secret
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chirp:*oauth-access-token* access-token
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chirp:*oauth-access-secret* access-secret)
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(error 'plugin-conf-error :plugin "twitter"
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:message "Credentials missing."))
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;; fallback to chirp for credential erros
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(chirp:account/verify-credentials)
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(when tweet-format
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(setf *tweet-format* tweet-format)))
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(defmethod deploy :after (staging)
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(declare (ignore staging))
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(loop :for (state file) :in (get-updated-files)
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:when (and (string= "A" state) (string= "post" (pathname-type file)))
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:do (tweet-new-post file)))
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(defun tweet-new-post (file)
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"Retrieve most recent post from in memory DB and publish it."
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(let ((post (coleslaw::find-content-by-path file)))
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(chirp:statuses/update (%format-post 0 post))))
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(defun %format-post (offset post)
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"Guarantee that the tweet content is 140 chars at most. The 117 comes from
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the spaxe needed for a space and the url."
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(let* ((content-prefix (subseq (render-tweet post) 0 (- 117 offset)))
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(content (format nil "~A ~A/~A" content-prefix
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(coleslaw::domain *config*)
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(page-url post)))
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(content-length (chirp:compute-status-length content)))
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(cond
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((>= 140 content-length) content)
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((< 140 content-length) (%format-post (1- offset) post)))))
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(defun render-tweet (post)
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"Sans the url, which is a must."
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(apply #'format `(nil ,(car *tweet-format*)
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,@(loop
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:for accesor in (cdr *tweet-format*)
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:collect (funcall accesor post)))))
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