mirror of
https://github.com/djcb/mu.git
synced 2024-06-28 07:41:04 +02:00
e9db0df402
Previously, the first element was used where the second should have been. In essence, whereas the algorithm is T[0]<<16 & T[1], the code was previously performing T[0]<<16 & T[0]. The timestamp produced was therefore inaccurate by up to about 18 hours.
205 lines
6.3 KiB
Scheme
Executable File
205 lines
6.3 KiB
Scheme
Executable File
#!/bin/sh
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exec guile -e main -s $0 $@
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!#
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;; Copyright (C) 2012 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
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;;
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;; This program is free software; you can redistribute it and/or modify it
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;; under the terms of the GNU General Public License as published by the
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;; Free Software Foundation; either version 3, or (at your option) any
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;; 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, write to the Free Software Foundation,
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;; Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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;;
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;; a little hack to convert the output of
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;; mu find <expr> --format=sexp
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;; and
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;; mu view <expr> --format=sexp
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;; into XML or JSON
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(use-modules (ice-9 getopt-long) (ice-9 format) (ice-9 regex))
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(use-modules (sxml simple))
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(define (mapconcat func lst sepa)
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"Apply FUNC to elements of LST, concat the result as strings
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separated by SEPA."
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(if (null? lst)
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""
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(string-append
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(func (car lst))
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(if (null? (cdr lst))
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""
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(string-append sepa (mapconcat func (cdr lst) sepa))))))
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(define (property-list? obj)
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"Is OBJ a elisp-style property list (ie. a list of the
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form (:symbol1 something :symbol2 somethingelse), as in an elisp
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proplilst."
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(and (list? obj)
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(not (null? obj))
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(symbol? (car obj))
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(string= ":" (substring (symbol->string (car obj)) 0 1))))
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(define (plist->pairs plist)
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"Convert an elisp-style property list; e.g:
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(:prop1 foo :prop2: bar ...)
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into a list of pairs
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((prop1 . foo) (prop2 . bar) ...)."
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(if (null? plist)
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'()
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(cons
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(cons
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(substring (symbol->string (car plist)) 1)
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(cadr plist))
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(plist->pairs (cddr plist)))))
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(define (string->xml str)
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"XML-encode STR."
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;; sneakily re-using sxml->xml
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(call-with-output-string (lambda (port) (sxml->xml str port))))
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(define (string->json str)
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"Convert string into a JSON-encoded string."
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(letrec ((convert
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(lambda (lst)
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(if (null? lst)
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""
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(string-append
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(cond
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((equal? (car lst) #\") "\\\"")
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((equal? (car lst) #\\) "\\\\")
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((equal? (car lst) #\/) "\\/")
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((equal? (car lst) #\bs) "\\b")
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((equal? (car lst) #\ff) "\\f")
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((equal? (car lst) #\lf) "\\n")
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((equal? (car lst) #\cr) "\\r")
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((equal? (car lst) #\ht) "\\t")
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(#t (string (car lst))))
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(convert (cdr lst)))))))
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(convert (string->list str))))
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(define (etime->time_t t)
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"Convert elisp time object T into a time_t value."
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(logior (ash (car t) 16) (car (cdr t))))
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(define (sexp->xml)
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"Convert string INPUT to XML, return the XML (string)."
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(letrec ((convert-xml
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(lambda* (expr #:optional parent)
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(cond
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((property-list? expr)
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(mapconcat
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(lambda (pair)
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(format #f "\t<~a>~a</~a>\n"
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(car pair) (convert-xml (cdr pair) (car pair)) (car pair)))
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(plist->pairs expr) " "))
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((list? expr)
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(cond
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((member parent '("from" "to" "cc" "bcc"))
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(mapconcat (lambda (addr)
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(format #f "<address>~a~a</address>"
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(if (string? (car addr))
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(format #f "<name>~a</name>"
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(string->xml (car addr))) "")
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(if (string? (cdr addr))
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(format #f "<email>~a</email>"
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(string->xml (cdr addr))) "")))
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expr " "))
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((string= parent "parts") "<!-- message parts -->") ;; for now, ignore
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;; convert the crazy emacs time thingy to time_t...
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((string= parent "date") (format #f "~a" (etime->time_t expr)))
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(#t
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(mapconcat
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(lambda (elm) (format #f "<item>~a</item>" (convert-xml elm))) expr ""))))
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((string? expr) (string->xml expr))
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((symbol? expr) (format #f "~a" expr))
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((number? expr) (number->string expr))
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(#t "."))))
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(msg->xml
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(lambda ()
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(let ((expr (read)))
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(if (not (eof-object? expr))
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(string-append (format #f "<message>\n~a</message>\n" (convert-xml expr)) (msg->xml))
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"")))))
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(format #f "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<messages>\n~a</messages>" (msg->xml))))
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(define (sexp->json)
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"Convert string INPUT to JSON, return the JSON (string)."
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(letrec ((convert-json
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(lambda* (expr #:optional parent)
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(cond
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((property-list? expr)
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(mapconcat
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(lambda (pair)
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(format #f "\n\t\"~a\": ~a"
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(car pair) (convert-json (cdr pair) (car pair))))
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(plist->pairs expr) ", "))
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((list? expr)
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(cond
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((member parent '("from" "to" "cc" "bcc"))
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(string-append "["
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(mapconcat (lambda (addr)
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(format #f "{~a~a}"
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(if (string? (car addr))
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(format #f "\"name\": \"~a\","
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(string->json (car addr))) "")
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(if (string? (cdr addr))
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(format #f "\"email\": \"~a\""
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(string->json (cdr addr))) "")))
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expr ", ")
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"]"))
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((string= parent "parts") "[]") ;; todo
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;; convert the crazy emacs time thingy to time_t...
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((string= parent "date")
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(format #f "~a" (format #f "~a" (etime->time_t expr))))
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(#t
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(string-append "["
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(mapconcat (lambda (elm) (format #f "~a" (convert-json elm))) expr ",") "]"))))
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((string? expr)
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(format #f "\"~a\"" (string->json expr)))
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((symbol? expr)
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(format #f "\"~a\"" expr))
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((number? expr) (number->string expr))
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(#t "."))))
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(msg->json
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(lambda (first)
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(let ((expr (read)))
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(if (not (eof-object? expr))
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(string-append (format #f "~a{~a\n}"
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(if first "" ",\n")
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(convert-json expr)) (msg->json #f))
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"")))))
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(format #f "[\n~a\n]" (msg->json #t))))
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(define (main args)
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(let* ((optionspec '((format (value #t))))
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(options (getopt-long args optionspec))
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(msg (string-append
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"usage: mu-sexp-convert "
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"--format=<xml|json>\n"
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"reads from standard-input and prints to standard output\n"))
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(outformat (or (option-ref options 'format #f)
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(begin (display msg) (exit 1)))))
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(cond
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((string= outformat "xml")
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(format #t "~a\n" (sexp->xml)))
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((string= outformat "json")
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(format #t "~a\n" (sexp->json)))
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(#t (begin
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(display msg)
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(exit 1))))))
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;; Local Variables:
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;; mode: scheme
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;; End:
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