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|
/*
* text-highlight.c
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation.
*
* 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 Lesser General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "e-mail-formatter-text-highlight.h"
#include "languages.h"
/* FIXME Delete these once we can use GSubprocess. */
#include <gio/gunixinputstream.h>
#include <gio/gunixoutputstream.h>
#include <em-format/e-mail-formatter-extension.h>
#include <em-format/e-mail-formatter.h>
#include <em-format/e-mail-part-utils.h>
#include <e-util/e-util.h>
#include <libebackend/libebackend.h>
#include <libedataserver/libedataserver.h>
#include <glib/gi18n-lib.h>
#include <X11/Xlib.h>
#include <camel/camel.h>
typedef EMailFormatterExtension EMailFormatterTextHighlight;
typedef EMailFormatterExtensionClass EMailFormatterTextHighlightClass;
typedef EExtension EMailFormatterTextHighlightLoader;
typedef EExtensionClass EMailFormatterTextHighlightLoaderClass;
typedef struct _TextHighlightClosure TextHighlightClosure;
struct _TextHighlightClosure {
GMainLoop *main_loop;
GError *input_error;
GError *output_error;
};
GType e_mail_formatter_text_highlight_get_type (void);
G_DEFINE_DYNAMIC_TYPE (
EMailFormatterTextHighlight,
e_mail_formatter_text_highlight,
E_TYPE_MAIL_FORMATTER_EXTENSION)
static gchar *
get_syntax (EMailPart *part,
const gchar *uri)
{
gchar *syntax = NULL;
CamelContentType *ct = NULL;
CamelMimePart *mime_part;
mime_part = e_mail_part_ref_mime_part (part);
if (uri) {
SoupURI *soup_uri = soup_uri_new (uri);
GHashTable *query = soup_form_decode (soup_uri->query);
syntax = g_hash_table_lookup (query, "__formatas");
if (syntax) {
syntax = g_strdup (syntax);
}
g_hash_table_destroy (query);
soup_uri_free (soup_uri);
}
/* Try to detect syntax by content-type first */
if (syntax == NULL) {
ct = camel_mime_part_get_content_type (mime_part);
if (ct) {
gchar *mime_type = camel_content_type_simple (ct);
syntax = (gchar *) get_syntax_for_mime_type (mime_type);
syntax = syntax ? g_strdup (syntax) : NULL;
g_free (mime_type);
}
}
/* If it fails or the content type too generic, try to detect it by
* filename extension */
if (syntax == NULL ||
(ct != NULL &&
(camel_content_type_is (ct, "application", "octet-stream") ||
(camel_content_type_is (ct, "text", "plain"))))) {
const gchar *filename;
filename = camel_mime_part_get_filename (mime_part);
if (filename != NULL) {
gchar *ext = g_strrstr (filename, ".");
if (ext != NULL) {
syntax = (gchar *) get_syntax_for_ext (ext + 1);
syntax = syntax ? g_strdup (syntax) : NULL;
}
}
}
/* Out of ideas - use plain text */
if (syntax == NULL) {
syntax = g_strdup ("txt");
}
g_object_unref (mime_part);
return syntax;
}
static void
text_highlight_input_spliced (GObject *source_object,
GAsyncResult *result,
gpointer user_data)
{
TextHighlightClosure *closure = user_data;
g_output_stream_splice_finish (
G_OUTPUT_STREAM (source_object),
result, &closure->input_error);
}
static void
text_highlight_output_spliced (GObject *source_object,
GAsyncResult *result,
gpointer user_data)
{
TextHighlightClosure *closure = user_data;
g_output_stream_splice_finish (
G_OUTPUT_STREAM (source_object),
result, &closure->output_error);
g_main_loop_quit (closure->main_loop);
}
static gboolean
text_highlight_feed_data (CamelStream *stream,
CamelDataWrapper *data_wrapper,
gint pipe_stdin,
gint pipe_stdout,
GCancellable *cancellable,
GError **error)
{
TextHighlightClosure closure;
GInputStream *input_stream = NULL;
GOutputStream *output_stream = NULL;
GInputStream *stdout_stream = NULL;
GOutputStream *stdin_stream = NULL;
GMainContext *main_context;
gchar *utf8_data;
gconstpointer data;
gssize bytes_written;
gsize size;
gboolean success;
/* We need to dump CamelDataWrapper to a buffer, force the content
* to valid UTF-8, feed the UTF-8 data to the 'highlight' process,
* read the converted data back and feed it to the CamelStream. */
/* FIXME Use GSubprocess once we can require GLib 2.40. */
output_stream = g_memory_output_stream_new_resizable ();
success = camel_data_wrapper_decode_to_output_stream_sync (
data_wrapper, output_stream, cancellable, error);
if (!success)
goto exit;
main_context = g_main_context_new ();
closure.main_loop = g_main_loop_new (main_context, FALSE);
closure.input_error = NULL;
closure.output_error = NULL;
g_main_context_push_thread_default (main_context);
data = g_memory_output_stream_get_data (
G_MEMORY_OUTPUT_STREAM (output_stream));
size = g_memory_output_stream_get_data_size (
G_MEMORY_OUTPUT_STREAM (output_stream));
/* FIXME Write a GConverter that does this so we can decode
* straight to the stdin pipe and skip all this extra
* buffering. */
utf8_data = e_util_utf8_data_make_valid ((gchar *) data, size);
g_clear_object (&output_stream);
/* Takes ownership of the UTF-8 string. */
input_stream = g_memory_input_stream_new_from_data (
utf8_data, -1, (GDestroyNotify) g_free);
output_stream = g_memory_output_stream_new_resizable ();
stdin_stream = g_unix_output_stream_new (pipe_stdin, TRUE);
stdout_stream = g_unix_input_stream_new (pipe_stdout, TRUE);
/* Splice the streams together. */
/* GCancellable is only supposed to be used in one operation
* at a time. Skip it here and use it for reading converted
* data, since that operation terminates the main loop. */
g_output_stream_splice_async (
stdin_stream, input_stream,
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE |
G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
G_PRIORITY_DEFAULT, NULL,
text_highlight_input_spliced,
&closure);
g_output_stream_splice_async (
output_stream, stdout_stream,
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE |
G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
G_PRIORITY_DEFAULT, cancellable,
text_highlight_output_spliced,
&closure);
g_main_loop_run (closure.main_loop);
g_main_context_pop_thread_default (main_context);
g_main_context_unref (main_context);
g_main_loop_unref (closure.main_loop);
g_clear_object (&input_stream);
g_clear_object (&stdin_stream);
g_clear_object (&stdout_stream);
if (closure.input_error != NULL) {
g_propagate_error (error, closure.input_error);
g_clear_error (&closure.output_error);
success = FALSE;
goto exit;
}
if (closure.output_error != NULL) {
g_propagate_error (error, closure.output_error);
success = FALSE;
goto exit;
}
data = g_memory_output_stream_get_data (
G_MEMORY_OUTPUT_STREAM (output_stream));
size = g_memory_output_stream_get_data_size (
G_MEMORY_OUTPUT_STREAM (output_stream));
bytes_written = camel_stream_write (
stream, data, size, cancellable, error);
success = (bytes_written >= 0);
exit:
g_clear_object (&output_stream);
return success;
}
static gboolean
emfe_text_highlight_format (EMailFormatterExtension *extension,
EMailFormatter *formatter,
EMailFormatterContext *context,
EMailPart *part,
CamelStream *stream,
GCancellable *cancellable)
{
CamelMimePart *mime_part;
CamelContentType *ct;
gboolean success = FALSE;
mime_part = e_mail_part_ref_mime_part (part);
ct = camel_mime_part_get_content_type (mime_part);
/* Don't format text/html unless it's an attachment */
if (ct && camel_content_type_is (ct, "text", "html")) {
const CamelContentDisposition *disp;
disp = camel_mime_part_get_content_disposition (mime_part);
if (disp == NULL)
goto exit;
if (g_strcmp0 (disp->disposition, "attachment") != 0)
goto exit;
}
if (context->mode == E_MAIL_FORMATTER_MODE_PRINTING) {
/* Don't interfere with printing. */
goto exit;
} else if (context->mode == E_MAIL_FORMATTER_MODE_RAW) {
gint pipe_stdin, pipe_stdout;
GPid pid;
CamelDataWrapper *dw;
gchar *font_family, *font_size, *syntax;
PangoFontDescription *fd;
GSettings *settings;
gchar *font = NULL;
const gchar *argv[] = {
HIGHLIGHT_COMMAND,
NULL, /* --font= */
NULL, /* --font-size= */
NULL, /* --syntax= */
"--out-format=html",
"--include-style",
"--inline-css",
"--style=bclear",
"--failsafe",
NULL };
dw = camel_medium_get_content (CAMEL_MEDIUM (mime_part));
if (dw == NULL)
goto exit;
syntax = get_syntax (part, context->uri);
/* Use the traditional text/plain formatter for plain-text */
if (g_strcmp0 (syntax, "txt") == 0) {
g_free (syntax);
goto exit;
}
settings = g_settings_new ("org.gnome.evolution.mail");
if (g_settings_get_boolean (settings, "use-custom-font"))
font = g_settings_get_string (
settings, "monospace-font");
g_object_unref (settings);
if (font == NULL) {
settings = g_settings_new (
"org.gnome.desktop.interface");
font = g_settings_get_string (
settings, "monospace-font-name");
g_object_unref (settings);
}
if (font == NULL)
font = g_strdup ("monospace 10");
fd = pango_font_description_from_string (font);
g_free (font);
font_family = g_strdup_printf (
"--font='%s'",
pango_font_description_get_family (fd));
font_size = g_strdup_printf (
"--font-size=%d",
pango_font_description_get_size (fd) / PANGO_SCALE);
argv[1] = font_family;
argv[2] = font_size;
argv[3] = g_strdup_printf ("--syntax=%s", syntax);
g_free (syntax);
success = g_spawn_async_with_pipes (
NULL, (gchar **) argv, NULL, 0, NULL, NULL,
&pid, &pipe_stdin, &pipe_stdout, NULL, NULL);
if (success) {
GError *local_error = NULL;
success = text_highlight_feed_data (
stream, dw,
pipe_stdin, pipe_stdout,
cancellable, &local_error);
if (g_error_matches (
local_error, G_IO_ERROR,
G_IO_ERROR_CANCELLED)) {
/* Do nothing. */
} else if (local_error != NULL) {
g_warning (
"%s: %s", G_STRFUNC,
local_error->message);
}
g_clear_error (&local_error);
g_spawn_close_pid (pid);
}
if (!success) {
/* We can't call e_mail_formatter_format_as on text/plain,
* because text-highlight is registered as an handler for
* text/plain, so we would end up in an endless recursion.
*
* Just return FALSE here and EMailFormatter will automatically
* fall back to the default text/plain formatter */
if (camel_content_type_is (ct, "text", "plain")) {
g_free (font_family);
g_free (font_size);
g_free ((gchar *) argv[3]);
pango_font_description_free (fd);
goto exit;
} else {
/* In case of any other content, force use of
* text/plain formatter, because returning FALSE
* for text/x-patch or application/php would show
* an error, as there is no other handler registered
* for these */
e_mail_formatter_format_as (
formatter, context, part, stream,
"application/vnd.evolution.plaintext",
cancellable);
}
}
g_free (font_family);
g_free (font_size);
g_free ((gchar *) argv[3]);
pango_font_description_free (fd);
} else {
CamelFolder *folder;
const gchar *message_uid;
const gchar *default_charset, *charset;
gchar *uri, *str;
gchar *syntax;
folder = e_mail_part_list_get_folder (context->part_list);
message_uid = e_mail_part_list_get_message_uid (context->part_list);
default_charset = e_mail_formatter_get_default_charset (formatter);
charset = e_mail_formatter_get_charset (formatter);
if (!default_charset)
default_charset = "";
if (!charset)
charset = "";
syntax = get_syntax (part, NULL);
uri = e_mail_part_build_uri (
folder, message_uid,
"part_id", G_TYPE_STRING, e_mail_part_get_id (part),
"mode", G_TYPE_INT, E_MAIL_FORMATTER_MODE_RAW,
"__formatas", G_TYPE_STRING, syntax,
"formatter_default_charset", G_TYPE_STRING, default_charset,
"formatter_charset", G_TYPE_STRING, charset,
NULL);
g_free (syntax);
str = g_strdup_printf (
"<div class=\"part-container-nostyle\" >"
"<iframe width=\"100%%\" height=\"10\""
" id=\"%s\" name=\"%s\" "
" class=\"-e-mail-formatter-frame-color -e-web-view-background-color\" "
" frameborder=\"0\" src=\"%s\" "
" style=\"border: 1px solid;\">"
"</iframe>"
"</div>",
e_mail_part_get_id (part),
e_mail_part_get_id (part),
uri);
camel_stream_write_string (stream, str, cancellable, NULL);
g_free (str);
g_free (uri);
}
success = TRUE;
exit:
g_object_unref (mime_part);
return success;
}
static void
e_mail_formatter_text_highlight_class_init (EMailFormatterExtensionClass *class)
{
class->display_name = _("Text Highlight");
class->description = _("Syntax highlighting of mail parts");
class->mime_types = get_mime_types ();
class->format = emfe_text_highlight_format;
}
static void
e_mail_formatter_text_highlight_class_finalize (EMailFormatterExtensionClass *class)
{
}
static void
e_mail_formatter_text_highlight_init (EMailFormatterExtension *extension)
{
}
void
e_mail_formatter_text_highlight_type_register (GTypeModule *type_module)
{
e_mail_formatter_text_highlight_register_type (type_module);
}
|