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(import shell sxml-serializer (chicken irregex) (chicken port) (chicken string) srfi-1 srfi-13 srfi-42)

(define terms 'tag:feed)

(define-syntax nm
  (syntax-rules ()
    ((notmuch command args ...)
     (with-input-from-string
	 (capture (notmuch command --format=sexp args ...))
       read))))

(define nm-sexp
  (list-ec
   (: result (nm search --limit=15 ,terms))
   (flatten
    (nm show --include-html ,(string-append "thread:" (second result))))))

(define (grab tag distance e)
  (distance (find-tail (cut equal? tag <>) e)))

(define (entry-date e)
  (string-chomp
    (capture
     (date -Iseconds -d
	   ,(string-append "@"
			   (number->string
			    (grab ':timestamp second e)))))))

(define (get-content e)
  (cond
   ((member "text/html" e)
    `(content
      (@ (type html))
      ,(grab "text/html" third e)))
   ((member "text/plain" e)
    `(content
      (@ (type text))
      ,(grab "text/plain" third e)))
   (else
    '(content
      (@ (type text))
      "Email had no easy content-type"))))

(serialize-sxml
 `(feed
   (@ (xmlns "http://www.w3.org/2005/Atom"))
   (title |Notmuch | ,terms)
   (id e0db61b1-9250-4cdc-bfca-de0eb2c3c42a)
   (updated ,(entry-date (first nm-sexp)))
   ,@(list-ec (: e nm-sexp)
	      `(entry
		(title ,(grab ':Subject second e))
		(id ,(grab ':id second e))
		(link ,(string-append "mid:" (grab ':id second e)))
		(updated
		 ,(entry-date e))
		,(get-content e)
		,(let ((s (grab ':From second e)))
		   `(author
		     (name ,(irregex-replace " <.*>$" s))
		     (email ,(irregex-replace "[^<]*<([^>]*)>$" s 1)))))))
 output: "/tmp/nmfeed.xml")