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- ;; -*- mode: scheme; -*-
- (use-modules (ice-9 popen))
- (use-modules (rnrs io ports))
- ;; This cannot be let-bound within `job'.
- (define currency-file (string-append (getenv "HOME") "/.cache/currency.units"))
- (define* (system-to-string #:rest args)
- (let* ((port (apply open-pipe* OPEN_READ args))
- (str (get-string-all port)))
- (close-pipe port)
- str))
- (define (gpg-keyinfo)
- "Return GPG keyinfo as a list of list of strings.
- Typical output is:
- S KEYINFO ???????????????????????????????????????? D - - - P - - -
- S KEYINFO ???????????????????????????????????????? D - - 1 P - - -
- The \"1\" means the key is cached."
- (filter (lambda (info) (string= (car info) "S"))
- (map (lambda (s) (string-split s #\space))
- (string-split
- (system-to-string "gpg-connect-agent" "keyinfo --list" "/bye")
- #\newline))))
- (define (gpg-key-cached?)
- "Return #t if a key is cached in the GPG agent, #f otherwise."
- (let ((keyinfo (gpg-keyinfo)))
- (not (null? (filter (lambda (info) (string= (list-ref info 6) "1"))
- keyinfo)))))
- (job
- (lambda (current-time)
- (let* ((seconds-in-a-day (* 60 60 24))
- (currency-time (if (not (file-exists? currency-file))
- 0
- (stat:mtime (stat currency-file)))))
- (if (< currency-time (- current-time seconds-in-a-day))
- ;; Use next-minute to avoid overwhelming the system in case of failure.
- (next-minute)
- (next-hour-from (next-day) (list (tm:hour (localtime currency-time)))))))
- ;; A string is nicer than Scheme code for `mcron --schedule' output.
- ;; Otherwise we could return '(system* "units_cur" currency-file)
- ;; and use job's 3rd argument as a description.
- (string-append "units_cur " currency-file))
- (job '(next-hour (range 0 24 3)) "updatedb-local")
- ;; (job '(next-minute (range 0 60 15))
- ;; (lambda ()
- ;; (when (gpg-key-cached?)
- ;; ;; Email is sync'ed from a pre-new hook.
- ;; (system* "notmuch" "new")))
- ;; "mail")
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