mirror of https://github.com/djcb/mu.git
* add mu-sexp-convert, a guile script to convert sexps into XML or JSON (WIP)
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#!/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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(use-modules (ice-9 getopt-long) (ice-9 format))
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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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(call-with-output-string (lambda (port) (sxml->xml str port))))
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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 t)))
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(define (output-xml)
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"Convert string INPUT to XML and print on stdout."
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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</email>"
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(if (string? (car addr))
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(format #f "<name>~a</name>" (string->xml (car addr))) "")
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(if (string? (cdr addr))
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(format #f "<email>~a</email>" (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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((string= parent "flags")
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(mapconcat (lambda (flag) (format #f "<flag>~a</flag>" flag)) expr ""))))
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((or (string? expr) (symbol? expr)) (string->xml expr))
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((number? expr) (number->string expr))
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(#t ".")))))
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(let ((expr (read)))
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(if (not (eof-object? expr))
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(begin
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(format #t "<message>\n~a</message>\n" (convert-xml expr))
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(output-xml))))))
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(define (output-json)
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"Convert string INPUT to JSON and print on stdout."
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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\"," (string->xml (car addr))) "")
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(if (string? (cdr addr))
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(format #f "\"email\":\"~a\"" (string->xml (cdr addr))) "")))
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expr " ")
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"]"))
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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" (format #f "~a" (etime->time_t expr))))
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((string= parent "flags")
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(string-append "["
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(mapconcat (lambda (flag) (format #f "\"flag\":\"~a\"" flag)) expr ", ")
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"]"))))
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((or (string? expr) (symbol? expr)) (format #f "\"~a\"" (string->xml expr)))
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((number? expr) (number->string expr))
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(#t ".")))))
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(let ((expr (read)))
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(if (not (eof-object? expr))
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(begin
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(format #t "{~a\n},\n" (convert-json expr))
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(output-json))))))
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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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(output-xml))
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((string= outformat "json")
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(output-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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