61 lines
2.2 KiB
Scheme
61 lines
2.2 KiB
Scheme
;;
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;; Copyright 2022, Jaidyn Levesque <jadedctrl@posteo.at>
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;;
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;; This program is free software: you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation, either version 3 of
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;; the License, or (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;
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;; Simple helper module for feedsnake; converts between datestrings of different
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;; formats and srfi-19 date objects.
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;; Some of these formats have dedicated output codes in srfi-19 (~c, ~x, etc),
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;; but it looks like the chicken doesn't support them.
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(module date-strings
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(date->rfc339-string rfc339-string->date date->rfc228-string date->mbox-string)
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(import scheme
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(chicken condition) (chicken format)
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srfi-19 srfi-13)
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;; Converts a date into an rfc399 string
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(define (date->rfc339-string date)
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(date->string date "~Y-~m-~dT~H:~M:~S~z"))
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;; Converts an rfc339 string into a datetime, timezone optional
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;; … copied but not exported by feedsnake? mayyyybe >w>"
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(define (rfc339-string->date string)
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(handle-exceptions exn
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(handle-exceptions exn
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(string->date string "~Y-~m-~dT~H:~M:~S~z")
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#f)
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(string->date string "~Y-~m-~dT~H:~M:~S")))
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;; Date into an RFC228 (e-mail) string
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(define (date->rfc228-string date)
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(let* ([month (string-titlecase (date->string date "~b"))]
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[weekday (string-titlecase (date->string date "~a"))]
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[timezone-raw (date->string date "~z")]
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[timezone (if (string=? timezone-raw "Z") "+0000" timezone-raw)])
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(format (date->string date "~~A, ~d ~~A ~Y ~T ~~A") weekday month timezone)))
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;; Converts a date into an mbox From-compatible string
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(define (date->mbox-string date)
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(let* ([month (string-titlecase (date->string date "~b"))]
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[weekday (string-titlecase (date->string date "~a"))])
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(format (date->string date "~~A ~~A ~d ~T ~Y") weekday month)))
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) ;; date-strings module
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