reply: Use RFC 2822/MIME wholly for text format template

Previously, reply's default text format used an odd mix of RFC 2045
MIME encoding for the reply template's body and some made-up RFC
2822-like UTF-8 format for the headers.  The intent was to present the
headers to the user in a nice, un-encoded format, but this assumed
that whatever ultimately sent the email would RFC 2047-encode the
headers, while at the same time the body was already RFC 2045 encoded,
so it assumed that whatever sent the email would *not* re-encode the
body.

This can be fixed by either producing a fully decoded UTF-8 reply
template, or a fully encoded MIME-compliant RFC 2822 message.  This
patch does the latter because it is

a) Well-defined by RFC 2822 and MIME (while any UTF-8 format would be
   ad hoc).

b) Ready to be piped to sendmail.  The point of the text format is to
   be minimal, so a user should be able to pop up the template in
   whatever editor they want, edit it, and push it to sendmail.

c) Consistent with frontend capabilities.  If a frontend has the
   smarts to RFC 2047 encode the headers before sending the mail, it
   probably has the smarts to RFC 2047 decode them before presenting
   the template to a user for editing.

Also, as far as I know, nothing automated consumes the reply text
format, so changing this should not cause serious problems.  (And if
anything does still consume this format, it probably gets these
encoding issues wrong anyway.)

7 files changed, 13 insertions, 351 deletions

diff --git a/Makefile.local b/Makefile.local
index 84043fe6..b7cd266d 100644
--- a/Makefile.local
+++ b/Makefile.local
@@ -255,7 +255,6 @@ notmuch_client_srcs =		\
 	command-line-arguments.c\
 	debugger.c		\
 	gmime-filter-reply.c	\
-	gmime-filter-headers.c	\
 	hooks.c			\
 	notmuch.c		\
 	notmuch-config.c	\
diff --git a/gmime-filter-headers.c b/gmime-filter-headers.c
deleted file mode 100644
index 7db3779b..00000000
--- a/gmime-filter-headers.c
+++ /dev/null
@@ -1,263 +0,0 @@
-/*
- * Copyright © 2009 Keith Packard <keithp@keithp.com>
- * Copyright © 2010 Michal Sojka <sojkam1@fel.cvut.cz>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- */
-
-#include "gmime-filter-headers.h"
-#include <string.h>
-#include <gmime/gmime-utils.h>
-#include <glib/gprintf.h>
-#include <stdlib.h>
-#include <xutil.h>
-
-/**
- * SECTION: gmime-filter-headers
- * @title: GMimeFilterHeaders
- * @short_description: Add/remove headers markers
- *
- * A #GMimeFilter for decoding rfc2047 encoded headers to UTF-8
- **/
-
-
-static void g_mime_filter_headers_class_init (GMimeFilterHeadersClass *klass);
-static void g_mime_filter_headers_init (GMimeFilterHeaders *filter, GMimeFilterHeadersClass *klass);
-static void g_mime_filter_headers_finalize (GObject *object);
-
-static GMimeFilter *filter_copy (GMimeFilter *filter);
-static void filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace,
-			   char **out, size_t *outlen, size_t *outprespace);
-static void filter_complete (GMimeFilter *filter, char *in, size_t len, size_t prespace,
-			     char **out, size_t *outlen, size_t *outprespace);
-static void filter_reset (GMimeFilter *filter);
-
-
-static GMimeFilterClass *parent_class = NULL;
-
-GType
-g_mime_filter_headers_get_type (void)
-{
-	static GType type = 0;
-
-	if (!type) {
-		static const GTypeInfo info = {
-			sizeof (GMimeFilterHeadersClass),
-			NULL, /* base_class_init */
-			NULL, /* base_class_finalize */
-			(GClassInitFunc) g_mime_filter_headers_class_init,
-			NULL, /* class_finalize */
-			NULL, /* class_data */
-			sizeof (GMimeFilterHeaders),
-			0,    /* n_preallocs */
-			(GInstanceInitFunc) g_mime_filter_headers_init,
-			NULL	/* value_table */
-		};
-
-		type = g_type_register_static (GMIME_TYPE_FILTER, "GMimeFilterHeaders", &info, (GTypeFlags) 0);
-	}
-
-	return type;
-}
-
-
-static void
-g_mime_filter_headers_class_init (GMimeFilterHeadersClass *klass)
-{
-	GObjectClass *object_class = G_OBJECT_CLASS (klass);
-	GMimeFilterClass *filter_class = GMIME_FILTER_CLASS (klass);
-
-	parent_class = (GMimeFilterClass *) g_type_class_ref (GMIME_TYPE_FILTER);
-
-	object_class->finalize = g_mime_filter_headers_finalize;
-
-	filter_class->copy = filter_copy;
-	filter_class->filter = filter_filter;
-	filter_class->complete = filter_complete;
-	filter_class->reset = filter_reset;
-}
-
-static void
-g_mime_filter_headers_init (GMimeFilterHeaders *filter, GMimeFilterHeadersClass *klass)
-{
-	(void) klass;
-	filter->saw_nl = TRUE;
-	filter->line = NULL;
-	filter->line_size = 0;
-	filter->lineptr = NULL;
-}
-
-static void
-g_mime_filter_headers_finalize (GObject *object)
-{
-	free (GMIME_FILTER_HEADERS (object)->line);
-	G_OBJECT_CLASS (parent_class)->finalize (object);
-}
-
-
-static GMimeFilter *
-filter_copy (GMimeFilter *filter)
-{
-	(void) filter;
-	return g_mime_filter_headers_new ();
-}
-
-static void
-output_decoded_header (GMimeFilterHeaders *headers, char **outptr)
-{
-	char *colon, *name, *s, *decoded_value;
-	size_t offset;
-	gint ret;
-
-	colon = strchr (headers->line, ':');
-	if (colon == NULL)
-		return;
-
-	name = headers->line;
-	*colon = '\0';
-	s = colon + 1;
-	while (*s == ' ' || *s == '\t')
-		s++;
-	decoded_value = g_mime_utils_header_decode_text(s);
-	if (decoded_value == NULL)
-		return;
-	offset = *outptr - GMIME_FILTER (headers)->outbuf;
-	g_mime_filter_set_size (GMIME_FILTER (headers), strlen(name) + 2 +
-			       strlen(decoded_value) + 2, TRUE);
-	*outptr = GMIME_FILTER (headers)->outbuf + offset;
-	ret = g_sprintf (*outptr, "%s: %s\n", name, decoded_value);
-	if (ret > 0)
-		*outptr += ret;
-	free (decoded_value);
-}
-
-static void
-output_final_newline (GMimeFilterHeaders *headers, char **outptr)
-{
-	size_t offset;
-
-	offset = *outptr - GMIME_FILTER (headers)->outbuf;
-	g_mime_filter_set_size (GMIME_FILTER (headers), 1, TRUE);
-	*outptr = GMIME_FILTER (headers)->outbuf + offset;
-	*(*outptr)++ = '\n';
-}
-
-static void
-filter_filter (GMimeFilter *filter, char *inbuf, size_t inlen, size_t prespace,
-	       char **outbuf, size_t *outlen, size_t *outprespace)
-{
-	GMimeFilterHeaders *headers = (GMimeFilterHeaders *) filter;
-	register const char *inptr = inbuf;
-	const char *inend = inbuf + inlen;
-	char *lineptr, *lineend, *outptr;
-
-	(void) prespace;
-	if (headers->line == NULL) {
-		headers->line_size = 200;
-		headers->lineptr = headers->line = malloc (headers->line_size);
-	}
-	lineptr = headers->lineptr;
-	lineend = headers->line + headers->line_size - 1;
-	if (lineptr == NULL)
-		return;
-	outptr = filter->outbuf;
-	while (inptr < inend) {
-		if (*inptr == '\n') {
-			if (headers->saw_nl)
-				output_final_newline(headers, &outptr);
-			headers->saw_nl = TRUE;
-			inptr++;
-			continue;
-		}
-
-		if (lineptr == lineend) {
-			headers->line_size *= 2;
-			headers->line = xrealloc (headers->line, headers->line_size);
-			lineptr = headers->line + (headers->line_size / 2) - 1;
-			lineend = headers->line + headers->line_size - 1;
-		}
-
-		if (headers->saw_nl && *inptr != ' ' && *inptr != '\t') {
-			*lineptr = '\0';
-			output_decoded_header (headers, &outptr);
-			lineptr = headers->line;
-		}
-		if (headers->saw_nl && (*inptr == ' ' || *inptr == '\t')) {
-			*lineptr = ' ';
-			lineptr++;
-			while (inptr < inend && (*inptr == ' ' || *inptr == '\t'))
-				inptr++;
-			headers->saw_nl = FALSE;
-			continue;
-		}
-		headers->saw_nl = FALSE;
-
-		if (*inptr != '\r')
-			*lineptr++ = *inptr;
-		inptr++;
-	}
-	if (headers->saw_nl) {
-		*lineptr = '\0';
-		output_decoded_header (headers, &outptr);
-		lineptr = headers->line;
-	}
-	headers->lineptr = lineptr;
-	*outlen = outptr - filter->outbuf;
-	*outprespace = filter->outpre;
-	*outbuf = filter->outbuf;
-}
-
-static void
-filter_complete (GMimeFilter *filter, char *inbuf, size_t inlen, size_t prespace,
-		 char **outbuf, size_t *outlen, size_t *outprespace)
-{
-	if (inbuf && inlen)
-		filter_filter (filter, inbuf, inlen, prespace, outbuf, outlen, outprespace);
-}
-
-static void
-filter_reset (GMimeFilter *filter)
-{
-	GMimeFilterHeaders *headers = (GMimeFilterHeaders *) filter;
-
-	headers->saw_nl = TRUE;
-	free(headers->line);
-	headers->line = NULL;
-	headers->line_size = 0;
-}
-
-
-/**
- * g_mime_filter_headers_new:
- * @encode: %TRUE if the filter should encode or %FALSE otherwise
- * @dots: encode/decode dots (as for SMTP)
- *
- * Creates a new #GMimeFilterHeaders filter.
- *
- * If @encode is %TRUE, then all lines will be prefixed by "> ",
- * otherwise any lines starting with "> " will have that removed
- *
- * Returns: a new #GMimeFilterHeaders filter.
- **/
-GMimeFilter *
-g_mime_filter_headers_new (void)
-{
-	GMimeFilterHeaders *new_headers;
-
-	new_headers = (GMimeFilterHeaders *) g_object_newv (GMIME_TYPE_FILTER_HEADERS, 0, NULL);
-
-	return (GMimeFilter *) new_headers;
-}
-
diff --git a/gmime-filter-headers.h b/gmime-filter-headers.h
deleted file mode 100644
index 1d1a3ebb..00000000
--- a/gmime-filter-headers.h
+++ /dev/null
@@ -1,69 +0,0 @@
-/*
- * Copyright © 2009 Keith Packard <keithp@keithp.com>
- * Copyright © 2010 Michal Sojka <sojkam1@fel.cvut.cz>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- */
-
-#ifndef _GMIME_FILTER_HEADERS_H_
-#define _GMIME_FILTER_HEADERS_H_
-
-#include <gmime/gmime-filter.h>
-
-G_BEGIN_DECLS
-
-#define GMIME_TYPE_FILTER_HEADERS            (g_mime_filter_headers_get_type ())
-#define GMIME_FILTER_HEADERS(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GMIME_TYPE_FILTER_HEADERS, GMimeFilterHeaders))
-#define GMIME_FILTER_HEADERS_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GMIME_TYPE_FILTER_HEADERS, GMimeFilterHeadersClass))
-#define GMIME_IS_FILTER_HEADERS(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GMIME_TYPE_FILTER_HEADERS))
-#define GMIME_IS_FILTER_HEADERS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GMIME_TYPE_FILTER_HEADERS))
-#define GMIME_FILTER_HEADERS_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GMIME_TYPE_FILTER_HEADERS, GMimeFilterHeadersClass))
-
-typedef struct _GMimeFilterHeaders GMimeFilterHeaders;
-typedef struct _GMimeFilterHeadersClass GMimeFilterHeadersClass;
-
-/**
- * GMimeFilterHeaders:
- * @parent_object: parent #GMimeFilter
- * @saw_nl: previous char was a \n
- * @line: temporary buffer for line unfolding
- * @line_size: size of currently allocated memory for @line
- * @lineptr: pointer to the first unused character in @line
- *
- * A filter to decode rfc2047 encoded headers
- **/
-struct _GMimeFilterHeaders {
-	GMimeFilter parent_object;
-
-	gboolean saw_nl;
-	char *line;
-	size_t line_size;
-	char *lineptr;
-};
-
-struct _GMimeFilterHeadersClass {
-	GMimeFilterClass parent_class;
-
-};
-
-
-GType g_mime_filter_headers_get_type (void);
-
-GMimeFilter *g_mime_filter_headers_new (void);
-
-G_END_DECLS
-
-
-#endif /* _GMIME_FILTER_HEADERS_H_ */
diff --git a/man/man1/notmuch-reply.1 b/man/man1/notmuch-reply.1
index ac76b07f..e5531456 100644
--- a/man/man1/notmuch-reply.1
+++ b/man/man1/notmuch-reply.1
@@ -41,7 +41,7 @@ include
 .RS
 .TP 4
 .BR default
-Includes subject and quoted message body.
+Includes subject and quoted message body as an RFC 2822 message.
 .TP
 .BR json
 Produces JSON output containing headers for a reply message and the
diff --git a/notmuch-reply.c b/notmuch-reply.c
index 472a002e..ac46d026 100644
--- a/notmuch-reply.c
+++ b/notmuch-reply.c
@@ -21,28 +21,18 @@
  */
 
 #include "notmuch-client.h"
-#include "gmime-filter-headers.h"
 #include "sprinter.h"
 
 static void
 show_reply_headers (GMimeMessage *message)
 {
-    GMimeStream *stream_stdout = NULL, *stream_filter = NULL;
+    GMimeStream *stream_stdout = NULL;
 
     stream_stdout = g_mime_stream_file_new (stdout);
     if (stream_stdout) {
 	g_mime_stream_file_set_owner (GMIME_STREAM_FILE (stream_stdout), FALSE);
-	stream_filter = g_mime_stream_filter_new(stream_stdout);
-	if (stream_filter) {
-		// g_mime_object_write_to_stream will produce
-		// RFC2047-encoded headers, but we want to present the
-		// user with decoded headers and let whatever
-		// ultimately sends the mail do the RFC2047 encoding.
-		g_mime_stream_filter_add(GMIME_STREAM_FILTER(stream_filter),
-					 g_mime_filter_headers_new());
-		g_mime_object_write_to_stream(GMIME_OBJECT(message), stream_filter);
-		g_object_unref(stream_filter);
-	}
+	/* Output RFC 2822 formatted (and RFC 2047 encoded) headers. */
+	g_mime_object_write_to_stream (GMIME_OBJECT(message), stream_stdout);
 	g_object_unref(stream_stdout);
     }
 }
diff --git a/test/reply b/test/reply
index a85ebe56..d4389cf5 100755
--- a/test/reply
+++ b/test/reply
@@ -132,7 +132,9 @@ add_message '[subject]="This subject is exactly 200 bytes in length. Other than
 	    '[body]="200-byte header"'
 output=$(notmuch reply id:${gen_msg_id})
 test_expect_equal "$output" "From: Notmuch Test Suite <test_suite@notmuchmail.org>
-Subject: Re: This subject is exactly 200 bytes in length. Other than its length there is not much of note here. Note that the length of 200 bytes includes the Subject: and Re: prefixes with two spaces
+Subject: Re: This subject is exactly 200 bytes in length. Other than its
+ length there is not much of note here. Note that the length of 200 bytes
+ includes the Subject: and Re: prefixes with two spaces
 In-Reply-To: <${gen_msg_id}>
 References: <${gen_msg_id}>
 
@@ -200,10 +202,11 @@ add_message '[subject]="=?iso-8859-1?q?=e0=df=e7?="' \
 	    '[body]="Encoding"'
 
 output=$(notmuch reply id:${gen_msg_id})
+# Note that GMime changes from Q- to B-encoding
 test_expect_equal "$output" "\
 From: Notmuch Test Suite <test_suite@notmuchmail.org>
-Subject: Re: àßç
-To: ☃ <snowman@example.com>
+Subject: Re: =?iso-8859-1?b?4N/n?=
+To: =?UTF-8?b?4piD?= <snowman@example.com>
 In-Reply-To: <${gen_msg_id}>
 References: <${gen_msg_id}>
 
diff --git a/test/reply-to-sender b/test/reply-to-sender
index c7d15bbe..30e5e385 100755
--- a/test/reply-to-sender
+++ b/test/reply-to-sender
@@ -200,7 +200,9 @@ add_message '[subject]="This subject is exactly 200 bytes in length. Other than
             '[body]="200-byte header"'
 output=$(notmuch reply  --reply-to=sender id:${gen_msg_id})
 test_expect_equal "$output" "From: Notmuch Test Suite <test_suite@notmuchmail.org>
-Subject: Re: This subject is exactly 200 bytes in length. Other than its length there is not much of note here. Note that the length of 200 bytes includes the Subject: and Re: prefixes with two spaces
+Subject: Re: This subject is exactly 200 bytes in length. Other than its
+ length there is not much of note here. Note that the length of 200 bytes
+ includes the Subject: and Re: prefixes with two spaces
 In-Reply-To: <${gen_msg_id}>
 References: <${gen_msg_id}>