Sylpheed

/*

 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client

 * Copyright (C) 1999-2005 Hiroyuki Yamamoto

 *

 * 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 2 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.

 */

#ifdef HAVE_CONFIG_H

#  include "config.h"

#endif

#include "defs.h"

#include <glib.h>

#include <glib/gi18n.h>

#include <gdk/gdk.h>

#include <gdk/gdkkeysyms.h>

#include <gtk/gtkvbox.h>

#include <gtk/gtkscrolledwindow.h>

#include <gtk/gtksignal.h>

#include <stdio.h>

#include <ctype.h>

#include <string.h>

#include <stdlib.h>

#include "main.h"

#include "summaryview.h"

#include "procheader.h"

#include "prefs_common.h"

#include "codeconv.h"

#include "statusbar.h"

#include "utils.h"

#include "gtkutils.h"

#include "procmime.h"

#include "account.h"

#include "html.h"

#include "compose.h"

#include "displayheader.h"

#include "alertpanel.h"

typedef struct _RemoteURI        RemoteURI;

struct _RemoteURI

{

        gchar *uri;

        guint start;

        guint end;

};

static GdkColor quote_colors[3] = {

        {(gulong)0, (gushort)0, (gushort)0, (gushort)0},

        {(gulong)0, (gushort)0, (gushort)0, (gushort)0},

        {(gulong)0, (gushort)0, (gushort)0, (gushort)0}

};

static GdkColor uri_color = {

        (gulong)0,

        (gushort)0,

        (gushort)0,

        (gushort)0

};

static GdkColor emphasis_color = {

        (gulong)0,

        (gushort)0,

        (gushort)0,

        (gushort)0xcfff

};

#if 0

static GdkColor error_color = {

        (gulong)0,

        (gushort)0xefff,

        (gushort)0,

        (gushort)0

};

#endif

#if USE_GPGME

static GdkColor good_sig_color = {

        (gulong)0,

        (gushort)0,

        (gushort)0xbfff,

        (gushort)0

};

static GdkColor untrusted_sig_color = {

        (gulong)0,

        (gushort)0xefff,

        (gushort)0,

        (gushort)0

};

static GdkColor nocheck_sig_color = {

        (gulong)0,

        (gushort)0,

        (gushort)0,

        (gushort)0xcfff

};

static GdkColor bad_sig_color = {

        (gulong)0,

        (gushort)0xefff,

        (gushort)0,

        (gushort)0

};

#endif

#define STATUSBAR_PUSH(textview, str)                                            \

{                                                                            \

        gtk_statusbar_push(GTK_STATUSBAR(textview->messageview->statusbar), \

                           textview->messageview->statusbar_cid, str);            \

}

#define STATUSBAR_POP(textview)                                                   \

{                                                                           \

        gtk_statusbar_pop(GTK_STATUSBAR(textview->messageview->statusbar), \

                          textview->messageview->statusbar_cid);           \

}

static void textview_add_part                (TextView        *textview,

                                         MimeInfo        *mimeinfo,

                                         FILE                *fp);

static void textview_add_parts                (TextView        *textview,

                                         MimeInfo        *mimeinfo,

                                         FILE                *fp);

static void textview_write_body                (TextView        *textview,

                                         MimeInfo        *mimeinfo,

                                         FILE                *fp,

                                         const gchar        *charset);

static void textview_show_html                (TextView        *textview,

                                         FILE                *fp,

                                         CodeConverter        *conv);

static void textview_write_line                (TextView        *textview,

                                         const gchar        *str,

                                         CodeConverter        *conv);

static void textview_write_link                (TextView        *textview,

                                         const gchar        *str,

                                         const gchar        *uri,

                                         CodeConverter        *conv);

static GPtrArray *textview_scan_header        (TextView        *textview,

                                         FILE                *fp);

static void textview_show_header        (TextView        *textview,

                                         GPtrArray        *headers);

static gboolean textview_key_pressed                (GtkWidget        *widget,

                                                 GdkEventKey        *event,

                                                 TextView        *textview);

static gboolean textview_uri_button_pressed        (GtkTextTag        *tag,

                                                 GObject        *obj,

                                                 GdkEvent        *event,

                                                 GtkTextIter        *iter,

                                                 TextView        *textview);

static void textview_smooth_scroll_do                (TextView        *textview,

                                                 gfloat                 old_value,

                                                 gfloat                 last_value,

                                                 gint                 step);

static void textview_smooth_scroll_one_line        (TextView        *textview,

                                                 gboolean         up);

static gboolean textview_smooth_scroll_page        (TextView        *textview,

                                                 gboolean         up);

static gboolean textview_uri_security_check        (TextView        *textview,

                                                 RemoteURI        *uri);

static void textview_uri_list_remove_all        (GSList                *uri_list);

TextView *textview_create(void)

{

        TextView *textview;

        GtkWidget *vbox;

        GtkWidget *scrolledwin;

        GtkWidget *text;

        GtkTextBuffer *buffer;

        GtkClipboard *clipboard;

        debug_print(_("Creating text view...\n"));

        textview = g_new0(TextView, 1);

        scrolledwin = gtk_scrolled_window_new(NULL, NULL);

        gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolledwin),

                                       GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);

        gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolledwin),

                                            GTK_SHADOW_IN);

        gtk_widget_set_size_request

                (scrolledwin, prefs_common.mainview_width, -1);

        text = gtk_text_view_new();

        gtk_widget_show(text);

        gtk_text_view_set_editable(GTK_TEXT_VIEW(text), FALSE);

        gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(text), GTK_WRAP_WORD);

        gtk_text_view_set_left_margin(GTK_TEXT_VIEW(text), 6);

        gtk_text_view_set_right_margin(GTK_TEXT_VIEW(text), 6);

        buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(text));

        clipboard = gtk_clipboard_get(GDK_SELECTION_PRIMARY);

        gtk_text_buffer_add_selection_clipboard(buffer, clipboard);

        gtk_widget_ref(scrolledwin);

        gtk_container_add(GTK_CONTAINER(scrolledwin), text);

        g_signal_connect(G_OBJECT(text), "key_press_event",

                         G_CALLBACK(textview_key_pressed), textview);

        gtk_widget_show(scrolledwin);

        vbox = gtk_vbox_new(FALSE, 0);

        gtk_box_pack_start(GTK_BOX(vbox), scrolledwin, TRUE, TRUE, 0);

        gtk_widget_show(vbox);

        textview->vbox             = vbox;

        textview->scrolledwin      = scrolledwin;

        textview->text             = text;

        textview->uri_list         = NULL;

        textview->body_pos         = 0;

        textview->show_all_headers = FALSE;

        return textview;

}

static void textview_create_tags(GtkTextView *text, TextView *textview)

{

        GtkTextBuffer *buffer;

        GtkTextTag *tag;

        static PangoFontDescription *font_desc, *bold_font_desc;

        if (!font_desc) {

                font_desc = gtkut_get_default_font_desc();

                bold_font_desc = pango_font_description_copy(font_desc);

                pango_font_description_set_weight

                        (bold_font_desc, PANGO_WEIGHT_BOLD);

        }

        buffer = gtk_text_view_get_buffer(text);

        gtk_text_buffer_create_tag(buffer, "header",

                                   "pixels-above-lines", 0,

                                   "pixels-above-lines-set", TRUE,

                                   "pixels-below-lines", 0,

                                   "pixels-below-lines-set", TRUE,

                                   "font-desc", font_desc,

                                   NULL);

        gtk_text_buffer_create_tag(buffer, "header_title",

                                   "font-desc", bold_font_desc,

                                   NULL);

        gtk_text_buffer_create_tag(buffer, "quote0",

                                   "foreground-gdk", &quote_colors[0],

                                   NULL);

        gtk_text_buffer_create_tag(buffer, "quote1",

                                   "foreground-gdk", &quote_colors[1],

                                   NULL);

        gtk_text_buffer_create_tag(buffer, "quote2",

                                   "foreground-gdk", &quote_colors[2],

                                   NULL);

        gtk_text_buffer_create_tag(buffer, "emphasis",

                                   "foreground-gdk", &emphasis_color,

                                   NULL);

        tag = gtk_text_buffer_create_tag(buffer, "link",

                                         "foreground-gdk", &uri_color,

                                         NULL);

#if USE_GPGME

        gtk_text_buffer_create_tag(buffer, "good-signature",

                                   "foreground-gdk", &good_sig_color,

                                   NULL);

        gtk_text_buffer_create_tag(buffer, "untrusted-signature",

                                   "foreground-gdk", &untrusted_sig_color,

                                   NULL);

        gtk_text_buffer_create_tag(buffer, "bad-signature",

                                   "foreground-gdk", &bad_sig_color,

                                   NULL);

        gtk_text_buffer_create_tag(buffer, "nocheck-signature",

                                   "foreground-gdk", &nocheck_sig_color,

                                   NULL);

#endif /* USE_GPGME */

        g_signal_connect(G_OBJECT(tag), "event",

                         G_CALLBACK(textview_uri_button_pressed), textview);

}

void textview_init(TextView *textview)

{

        textview_update_message_colors();

        textview_set_all_headers(textview, FALSE);

        textview_set_font(textview, NULL);

        textview_create_tags(GTK_TEXT_VIEW(textview->text), textview);

}

void textview_update_message_colors(void)

{

        GdkColor black = {0, 0, 0, 0};

        if (prefs_common.enable_color) {

                /* grab the quote colors, converting from an int to a GdkColor */

                gtkut_convert_int_to_gdk_color(prefs_common.quote_level1_col,

                                               &quote_colors[0]);

                gtkut_convert_int_to_gdk_color(prefs_common.quote_level2_col,

                                               &quote_colors[1]);

                gtkut_convert_int_to_gdk_color(prefs_common.quote_level3_col,

                                               &quote_colors[2]);

                gtkut_convert_int_to_gdk_color(prefs_common.uri_col,

                                               &uri_color);

        } else {

                quote_colors[0] = quote_colors[1] = quote_colors[2] = 

                        uri_color = emphasis_color = black;

        }

}

void textview_show_message(TextView *textview, MimeInfo *mimeinfo,

                           const gchar *file)

{

        FILE *fp;

        const gchar *charset = NULL;

        GPtrArray *headers = NULL;

        if ((fp = fopen(file, "rb")) == NULL) {

                FILE_OP_ERROR(file, "fopen");

                return;

        }

        if (textview->messageview->forced_charset)

                charset = textview->messageview->forced_charset;

        else if (prefs_common.force_charset)

                charset = prefs_common.force_charset;

        else if (mimeinfo->charset)

                charset = mimeinfo->charset;

        textview_set_font(textview, charset);

        textview_clear(textview);

        if (fseek(fp, mimeinfo->fpos, SEEK_SET) < 0) perror("fseek");

        headers = textview_scan_header(textview, fp);

        if (headers) {

                GtkTextView *text = GTK_TEXT_VIEW(textview->text);

                GtkTextBuffer *buffer;

                GtkTextIter iter;

                textview_show_header(textview, headers);

                procheader_header_array_destroy(headers);

                buffer = gtk_text_view_get_buffer(text);

                gtk_text_buffer_get_end_iter(buffer, &iter);

                textview->body_pos = gtk_text_iter_get_offset(&iter);

        }

        textview_add_parts(textview, mimeinfo, fp);

        fclose(fp);

        textview_set_position(textview, 0);

}

void textview_show_part(TextView *textview, MimeInfo *mimeinfo, FILE *fp)

{

        gchar buf[BUFFSIZE];

        const gchar *boundary = NULL;

        gint boundary_len = 0;

        const gchar *charset = NULL;

        GPtrArray *headers = NULL;

        gboolean is_rfc822_part = FALSE;

        g_return_if_fail(mimeinfo != NULL);

        g_return_if_fail(fp != NULL);

        if (mimeinfo->mime_type == MIME_MULTIPART) {

                textview_clear(textview);

                textview_add_parts(textview, mimeinfo, fp);

                return;

        }

        if (mimeinfo->parent && mimeinfo->parent->boundary) {

                boundary = mimeinfo->parent->boundary;

                boundary_len = strlen(boundary);

        }

        if (!boundary && mimeinfo->mime_type == MIME_TEXT) {

                if (fseek(fp, mimeinfo->fpos, SEEK_SET) < 0)

                        perror("fseek");

                headers = textview_scan_header(textview, fp);

        } else {

                if (mimeinfo->mime_type == MIME_TEXT && mimeinfo->parent) {

                        glong fpos;

                        MimeInfo *parent = mimeinfo->parent;

                        while (parent->parent) {

                                if (parent->main &&

                                    parent->main->mime_type ==

                                        MIME_MESSAGE_RFC822)

                                        break;

                                parent = parent->parent;

                        }

                        if ((fpos = ftell(fp)) < 0)

                                perror("ftell");

                        else if (fseek(fp, parent->fpos, SEEK_SET) < 0)

                                perror("fseek");

                        else {

                                headers = textview_scan_header(textview, fp);

                                if (fseek(fp, fpos, SEEK_SET) < 0)

                                        perror("fseek");

                        }

                }

                /* skip MIME part headers */

                while (fgets(buf, sizeof(buf), fp) != NULL)

                        if (buf[0] == '\r' || buf[0] == '\n') break;

        }

        /* display attached RFC822 single text message */

        if (mimeinfo->mime_type == MIME_MESSAGE_RFC822) {

                if (headers) procheader_header_array_destroy(headers);

                if (!mimeinfo->sub) {

                        textview_clear(textview);

                        return;

                }

                headers = textview_scan_header(textview, fp);

                mimeinfo = mimeinfo->sub;

                is_rfc822_part = TRUE;

        }

        if (textview->messageview->forced_charset)

                charset = textview->messageview->forced_charset;

        else if (prefs_common.force_charset)

                charset = prefs_common.force_charset;

        else if (mimeinfo->charset)

                charset = mimeinfo->charset;

        textview_set_font(textview, charset);

        textview_clear(textview);

        if (headers) {

                GtkTextView *text = GTK_TEXT_VIEW(textview->text);

                GtkTextBuffer *buffer;

                GtkTextIter iter;

                textview_show_header(textview, headers);

                procheader_header_array_destroy(headers);

                buffer = gtk_text_view_get_buffer(text);

                gtk_text_buffer_get_end_iter(buffer, &iter);

                textview->body_pos = gtk_text_iter_get_offset(&iter);

                if (!mimeinfo->main)

                        gtk_text_buffer_insert(buffer, &iter, "\n", 1);

        }

        if (mimeinfo->mime_type == MIME_MULTIPART || is_rfc822_part)

                textview_add_parts(textview, mimeinfo, fp);

        else

                textview_write_body(textview, mimeinfo, fp, charset);

}

static void textview_add_part(TextView *textview, MimeInfo *mimeinfo, FILE *fp)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        gchar buf[BUFFSIZE];

        const gchar *boundary = NULL;

        gint boundary_len = 0;

        const gchar *charset = NULL;

        GPtrArray *headers = NULL;

        g_return_if_fail(mimeinfo != NULL);

        g_return_if_fail(fp != NULL);

        buffer = gtk_text_view_get_buffer(text);

        gtk_text_buffer_get_end_iter(buffer, &iter);

        if (mimeinfo->mime_type == MIME_MULTIPART) return;

        if (fseek(fp, mimeinfo->fpos, SEEK_SET) < 0) {

                perror("fseek");

                return;

        }

        if (mimeinfo->parent && mimeinfo->parent->boundary) {

                boundary = mimeinfo->parent->boundary;

                boundary_len = strlen(boundary);

        }

        while (fgets(buf, sizeof(buf), fp) != NULL)

                if (buf[0] == '\r' || buf[0] == '\n') break;

        if (mimeinfo->mime_type == MIME_MESSAGE_RFC822) {

                headers = textview_scan_header(textview, fp);

                if (headers) {

                        gtk_text_buffer_insert(buffer, &iter, "\n", 1);

                        textview_show_header(textview, headers);

                        procheader_header_array_destroy(headers);

                }

                return;

        }

#if USE_GPGME

        if (mimeinfo->sigstatus)

                g_snprintf(buf, sizeof(buf), "\n[%s (%s)]\n",

                           mimeinfo->content_type, mimeinfo->sigstatus);

        else

#endif

        if (mimeinfo->filename || mimeinfo->name)

                g_snprintf(buf, sizeof(buf), "\n[%s  %s (%d bytes)]\n",

                           mimeinfo->filename ? mimeinfo->filename :

                           mimeinfo->name,

                           mimeinfo->content_type, mimeinfo->size);

        else

                g_snprintf(buf, sizeof(buf), "\n[%s (%d bytes)]\n",

                           mimeinfo->content_type, mimeinfo->size);

#if USE_GPGME

        if (mimeinfo->sigstatus) {

                const gchar *color;

                if (!strcmp(mimeinfo->sigstatus, _("Good signature")))

                        color = "good-signature";

                else if (!strcmp(mimeinfo->sigstatus, _("Valid signature (untrusted key)")))

                        color = "untrusted-signature";

                else if (!strcmp(mimeinfo->sigstatus, _("BAD signature")))

                        color = "bad-signature";

                else

                        color = "nocheck-signature";

                gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, buf, -1,

                                                         color, NULL);

        } else

#endif

        if (mimeinfo->mime_type != MIME_TEXT &&

            mimeinfo->mime_type != MIME_TEXT_HTML) {

                gtk_text_buffer_insert(buffer, &iter, buf, -1);

        } else {

                if (!mimeinfo->main &&

                    mimeinfo->parent &&

                    mimeinfo->parent->children != mimeinfo)

                        gtk_text_buffer_insert(buffer, &iter, buf, -1);

                else

                        gtk_text_buffer_insert(buffer, &iter, "\n", 1);

                if (textview->messageview->forced_charset)

                        charset = textview->messageview->forced_charset;

                else if (prefs_common.force_charset)

                        charset = prefs_common.force_charset;

                else if (mimeinfo->charset)

                        charset = mimeinfo->charset;

                textview_write_body(textview, mimeinfo, fp, charset);

        }

}

static void textview_add_parts(TextView *textview, MimeInfo *mimeinfo, FILE *fp)

{

        gint level;

        g_return_if_fail(mimeinfo != NULL);

        g_return_if_fail(fp != NULL);

        level = mimeinfo->level;

        for (;;) {

                textview_add_part(textview, mimeinfo, fp);

                if (mimeinfo->parent && mimeinfo->parent->content_type &&

                    !strcasecmp(mimeinfo->parent->content_type,

                                "multipart/alternative"))

                        mimeinfo = mimeinfo->parent->next;

                else

                        mimeinfo = procmime_mimeinfo_next(mimeinfo);

                if (!mimeinfo || mimeinfo->level <= level)

                        break;

        }

}

#define TEXT_INSERT(str) \

        gtk_text_buffer_insert(buffer, &iter, str, -1)

void textview_show_error(TextView *textview)

{

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        textview_set_font(textview, NULL);

        textview_clear(textview);

        buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview->text));

        gtk_text_buffer_get_start_iter(buffer, &iter);

        TEXT_INSERT(_("This message can't be displayed.\n"));

}

void textview_show_mime_part(TextView *textview, MimeInfo *partinfo)

{

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        if (!partinfo) return;

        textview_set_font(textview, NULL);

        textview_clear(textview);

        buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview->text));

        gtk_text_buffer_get_start_iter(buffer, &iter);

        TEXT_INSERT(_("To save this part, pop up the context menu with "));

        TEXT_INSERT(_("right click and select `Save as...', "));

        TEXT_INSERT(_("or press `y' key.\n\n"));

        TEXT_INSERT(_("To display this part as a text message, select "));

        TEXT_INSERT(_("`Display as text', or press `t' key.\n\n"));

        TEXT_INSERT(_("To open this part with external program, select "));

        TEXT_INSERT(_("`Open' or `Open with...', "));

        TEXT_INSERT(_("or double-click, or click the center button, "));

        TEXT_INSERT(_("or press `l' key."));

}

#if USE_GPGME

void textview_show_signature_part(TextView *textview, MimeInfo *partinfo)

{

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        if (!partinfo) return;

        textview_set_font(textview, NULL);

        textview_clear(textview);

        buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview->text));

        gtk_text_buffer_get_start_iter(buffer, &iter);

        if (partinfo->sigstatus_full == NULL) {

                TEXT_INSERT(_("This signature has not been checked yet.\n"));

                TEXT_INSERT(_("To check it, pop up the context menu with\n"));

                TEXT_INSERT(_("right click and select `Check signature'.\n"));

        } else {

                TEXT_INSERT(partinfo->sigstatus_full);

        }

}

#endif /* USE_GPGME */

#undef TEXT_INSERT

static void textview_write_body(TextView *textview, MimeInfo *mimeinfo,

                                FILE *fp, const gchar *charset)

{

        FILE *tmpfp;

        gchar buf[BUFFSIZE];

        CodeConverter *conv;

        conv = conv_code_converter_new(charset);

        tmpfp = procmime_decode_content(NULL, fp, mimeinfo);

        if (tmpfp) {

                if (mimeinfo->mime_type == MIME_TEXT_HTML)

                        textview_show_html(textview, tmpfp, conv);

                else

                        while (fgets(buf, sizeof(buf), tmpfp) != NULL)

                                textview_write_line(textview, buf, conv);

                fclose(tmpfp);

        }

        conv_code_converter_destroy(conv);

}

static void textview_show_html(TextView *textview, FILE *fp,

                               CodeConverter *conv)

{

        HTMLParser *parser;

        gchar *str;

        parser = html_parser_new(fp, conv);

        g_return_if_fail(parser != NULL);

        while ((str = html_parse(parser)) != NULL) {

                if (parser->href != NULL)

                        textview_write_link(textview, str, parser->href, NULL);

                else

                        textview_write_line(textview, str, NULL);

        }

        html_parser_destroy(parser);

}

/* get_uri_part() - retrieves a URI starting from scanpos.

                    Returns TRUE if succesful */

static gboolean get_uri_part(const gchar *start, const gchar *scanpos,

                             const gchar **bp, const gchar **ep)

{

        const gchar *ep_;

        g_return_val_if_fail(start != NULL, FALSE);

        g_return_val_if_fail(scanpos != NULL, FALSE);

        g_return_val_if_fail(bp != NULL, FALSE);

        g_return_val_if_fail(ep != NULL, FALSE);

        *bp = scanpos;

        /* find end point of URI */

        for (ep_ = scanpos; *ep_ != '\0'; ep_++) {

                if (!isgraph(*(const guchar *)ep_) ||

                    !isascii(*(const guchar *)ep_) ||

                    strchr("()<>\"", *ep_))

                        break;

        }

        /* no punctuation at end of string */

        /* FIXME: this stripping of trailing punctuations may bite with other URIs.

         * should pass some URI type to this function and decide on that whether

         * to perform punctuation stripping */

#define IS_REAL_PUNCT(ch)        (ispunct(ch) && ((ch) != '/')) 

        for (; ep_ - 1 > scanpos + 1 &&

               IS_REAL_PUNCT(*(const guchar *)(ep_ - 1));

             ep_--)

                ;

#undef IS_REAL_PUNCT

        *ep = ep_;

        return TRUE;                

}

static gchar *make_uri_string(const gchar *bp, const gchar *ep)

{

        return g_strndup(bp, ep - bp);

}

/* valid mail address characters */

#define IS_RFC822_CHAR(ch) \

        (isascii(ch) && \

         (ch) > 32   && \

         (ch) != 127 && \

         !isspace(ch) && \

         !strchr("(),;<>\"", (ch)))

/* alphabet and number within 7bit ASCII */

#define IS_ASCII_ALNUM(ch)        (isascii(ch) && isalnum(ch))

/* get_email_part() - retrieves an email address. Returns TRUE if succesful */

static gboolean get_email_part(const gchar *start, const gchar *scanpos,

                               const gchar **bp, const gchar **ep)

{

        /* more complex than the uri part because we need to scan back and forward starting from

         * the scan position. */

        gboolean result = FALSE;

        const gchar *bp_;

        const gchar *ep_;

        g_return_val_if_fail(start != NULL, FALSE);

        g_return_val_if_fail(scanpos != NULL, FALSE);

        g_return_val_if_fail(bp != NULL, FALSE);

        g_return_val_if_fail(ep != NULL, FALSE);

        /* scan start of address */

        for (bp_ = scanpos - 1;

             bp_ >= start && IS_RFC822_CHAR(*(const guchar *)bp_); bp_--)

                ;

        /* TODO: should start with an alnum? */

        bp_++;

        for (; bp_ < scanpos && !IS_ASCII_ALNUM(*(const guchar *)bp_); bp_++)

                ;

        if (bp_ != scanpos) {

                /* scan end of address */

                for (ep_ = scanpos + 1;

                     *ep_ && IS_RFC822_CHAR(*(const guchar *)ep_); ep_++)

                        ;

                /* TODO: really should terminate with an alnum? */

                for (; ep_ > scanpos && !IS_ASCII_ALNUM(*(const guchar *)ep_);

                     --ep_)

                        ;

                ep_++;

                if (ep_ > scanpos + 1) {

                        *ep = ep_;

                        *bp = bp_;

                        result = TRUE;

                }

        }

        return result;

}

#undef IS_ASCII_ALNUM

#undef IS_RFC822_CHAR

static gchar *make_email_string(const gchar *bp, const gchar *ep)

{

        /* returns a mailto: URI; mailto: is also used to detect the

         * uri type later on in the button_pressed signal handler */

        gchar *tmp;

        gchar *result;

        tmp = g_strndup(bp, ep - bp);

        result = g_strconcat("mailto:", tmp, NULL);

        g_free(tmp);

        return result;

}

#define ADD_TXT_POS(bp_, ep_, pti_) \

        if ((last->next = alloca(sizeof(struct txtpos))) != NULL) { \

                last = last->next; \

                last->bp = (bp_); last->ep = (ep_); last->pti = (pti_); \

                last->next = NULL; \

        } else { \

                g_warning("alloc error scanning URIs\n"); \

                gtk_text_buffer_insert_with_tags_by_name \

                        (buffer, &iter, linebuf, -1, fg_tag, NULL); \

                return; \

        }

/* textview_make_clickable_parts() - colorizes clickable parts */

static void textview_make_clickable_parts(TextView *textview,

                                          const gchar *fg_tag,

                                          const gchar *uri_tag,

                                          const gchar *linebuf)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        /* parse table - in order of priority */

        struct table {

                const gchar *needle; /* token */

                /* token search function */

                gchar    *(*search)        (const gchar *haystack,

                                         const gchar *needle);

                /* part parsing function */

                gboolean  (*parse)        (const gchar *start,

                                         const gchar *scanpos,

                                         const gchar **bp_,

                                         const gchar **ep_);

                /* part to URI function */

                gchar    *(*build_uri)        (const gchar *bp,

                                         const gchar *ep);

        };

        static struct table parser[] = {

                {"http://",  strcasestr, get_uri_part,   make_uri_string},

                {"https://", strcasestr, get_uri_part,   make_uri_string},

                {"ftp://",   strcasestr, get_uri_part,   make_uri_string},

                {"www.",     strcasestr, get_uri_part,   make_uri_string},

                {"mailto:",  strcasestr, get_uri_part,   make_uri_string},

                {"@",        strcasestr, get_email_part, make_email_string}

        };

        const gint PARSE_ELEMS = sizeof parser / sizeof parser[0];

        gint  n;

        const gchar *walk, *bp, *ep;

        struct txtpos {

                const gchar        *bp, *ep;        /* text position */

                gint                 pti;                /* index in parse table */

                struct txtpos        *next;                /* next */

        } head = {NULL, NULL, 0,  NULL}, *last = &head;

        buffer = gtk_text_view_get_buffer(text);

        gtk_text_buffer_get_end_iter(buffer, &iter);

        /* parse for clickable parts, and build a list of begin and

           end positions  */

        for (walk = linebuf, n = 0;;) {

                gint last_index = PARSE_ELEMS;

                gchar *scanpos = NULL;

                /* FIXME: this looks phony. scanning for anything in the

                   parse table */

                for (n = 0; n < PARSE_ELEMS; n++) {

                        gchar *tmp;

                        tmp = parser[n].search(walk, parser[n].needle);

                        if (tmp) {

                                if (scanpos == NULL || tmp < scanpos) {

                                        scanpos = tmp;

                                        last_index = n;

                                }

                        }                                        

                }

                if (scanpos) {

                        /* check if URI can be parsed */

                        if (parser[last_index].parse(walk, scanpos, &bp, &ep)

                            && (ep - bp - 1) > strlen(parser[last_index].needle)) {

                                        ADD_TXT_POS(bp, ep, last_index);

                                        walk = ep;

                        } else

                                walk = scanpos +

                                        strlen(parser[last_index].needle);

                } else

                        break;

        }

        /* colorize this line */

        if (head.next) {

                const gchar *normal_text = linebuf;

                /* insert URIs */

                for (last = head.next; last != NULL;

                     normal_text = last->ep, last = last->next) {

                        RemoteURI *uri;

                        uri = g_new(RemoteURI, 1);

                        if (last->bp - normal_text > 0)

                                gtk_text_buffer_insert_with_tags_by_name

                                        (buffer, &iter,

                                         normal_text,

                                         last->bp - normal_text,

                                         fg_tag, NULL);

                        uri->uri = parser[last->pti].build_uri(last->bp,

                                                               last->ep);

                        uri->start = gtk_text_iter_get_offset(&iter);

                        gtk_text_buffer_insert_with_tags_by_name

                                (buffer, &iter, last->bp, last->ep - last->bp,

                                 uri_tag, fg_tag, NULL);

                        uri->end = gtk_text_iter_get_offset(&iter);

                        textview->uri_list =

                                g_slist_append(textview->uri_list, uri);

                }

                if (*normal_text)

                        gtk_text_buffer_insert_with_tags_by_name

                                (buffer, &iter, normal_text, -1, fg_tag, NULL);

        } else {

                gtk_text_buffer_insert_with_tags_by_name

                        (buffer, &iter, linebuf, -1, fg_tag, NULL);

        }

}

#undef ADD_TXT_POS

static void textview_write_line(TextView *textview, const gchar *str,

                                CodeConverter *conv)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        gchar buf[BUFFSIZE];

        gchar *fg_color;

        gint quotelevel = -1;

        gchar quote_tag_str[10];

        buffer = gtk_text_view_get_buffer(text);

        gtk_text_buffer_get_end_iter(buffer, &iter);

        if (!conv)

                strncpy2(buf, str, sizeof(buf));

        else if (conv_convert(conv, buf, sizeof(buf), str) < 0)

                conv_utf8todisp(buf, sizeof(buf), str);

        strcrchomp(buf);

        //if (prefs_common.conv_mb_alnum) conv_mb_alnum(buf);

        fg_color = NULL;

        /* change color of quotation

           >, foo>, _> ... ok, <foo>, foo bar>, foo-> ... ng

           Up to 3 levels of quotations are detected, and each

           level is colored using a different color. */

        if (prefs_common.enable_color && strchr(buf, '>')) {

                quotelevel = get_quote_level(buf);

                /* set up the correct foreground color */

                if (quotelevel > 2) {

                        /* recycle colors */

                        if (prefs_common.recycle_quote_colors)

                                quotelevel %= 3;

                        else

                                quotelevel = 2;

                }

        }

        if (quotelevel == -1)

                fg_color = NULL;

        else {

                g_snprintf(quote_tag_str, sizeof(quote_tag_str),

                           "quote%d", quotelevel);

                fg_color = quote_tag_str;

        }

        if (prefs_common.enable_color)

                textview_make_clickable_parts(textview, fg_color, "link", buf);

        else

                textview_make_clickable_parts(textview, fg_color, NULL, buf);

}

void textview_write_link(TextView *textview, const gchar *str,

                         const gchar *uri, CodeConverter *conv)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        gchar buf[BUFFSIZE];

        gchar *bufp;

        RemoteURI *r_uri;

        if (*str == '\0')

                return;

        buffer = gtk_text_view_get_buffer(text);

        gtk_text_buffer_get_end_iter(buffer, &iter);

        if (!conv)

                strncpy2(buf, str, sizeof(buf));

        else if (conv_convert(conv, buf, sizeof(buf), str) < 0)

                conv_utf8todisp(buf, sizeof(buf), str);

        strcrchomp(buf);

        for (bufp = buf; isspace(*(guchar *)bufp); bufp++)

                gtk_text_buffer_insert(buffer, &iter, bufp, 1);

        r_uri = g_new(RemoteURI, 1);

        r_uri->uri = g_strdup(uri);

        r_uri->start = gtk_text_iter_get_offset(&iter);

        gtk_text_buffer_insert_with_tags_by_name

                (buffer, &iter, bufp, -1, "link", NULL);

        r_uri->end = gtk_text_iter_get_offset(&iter);

        textview->uri_list = g_slist_append(textview->uri_list, r_uri);

}

void textview_clear(TextView *textview)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkTextBuffer *buffer;

        buffer = gtk_text_view_get_buffer(text);

        gtk_text_buffer_set_text(buffer, "", -1);

        STATUSBAR_POP(textview);

        textview_uri_list_remove_all(textview->uri_list);

        textview->uri_list = NULL;

        textview->body_pos = 0;

        //textview->cur_pos  = 0;

}

void textview_destroy(TextView *textview)

{

        textview_uri_list_remove_all(textview->uri_list);

        textview->uri_list = NULL;

        g_free(textview);

}

void textview_set_all_headers(TextView *textview, gboolean all_headers)

{

        textview->show_all_headers = all_headers;

}

void textview_set_font(TextView *textview, const gchar *codeset)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        if (prefs_common.textfont) {

                PangoFontDescription *font_desc;

                font_desc = pango_font_description_from_string

                        (prefs_common.textfont);

                if (font_desc) {

                        gtk_widget_modify_font(textview->text, font_desc);

                        pango_font_description_free(font_desc);

                }

        }

        gtk_text_view_set_pixels_above_lines(text, prefs_common.line_space / 2);

        gtk_text_view_set_pixels_below_lines(text, prefs_common.line_space / 2);

}

void textview_set_position(TextView *textview, gint pos)

{

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview->text));

        gtk_text_buffer_get_iter_at_offset(buffer, &iter, pos);

        gtk_text_buffer_place_cursor(buffer, &iter);

}

static GPtrArray *textview_scan_header(TextView *textview, FILE *fp)

{

        gchar buf[BUFFSIZE];

        GPtrArray *headers, *sorted_headers;

        GSList *disphdr_list;

        Header *header;

        gint i;

        g_return_val_if_fail(fp != NULL, NULL);

        if (textview->show_all_headers)

                return procheader_get_header_array_asis(fp);

        if (!prefs_common.display_header) {

                while (fgets(buf, sizeof(buf), fp) != NULL)

                        if (buf[0] == '\r' || buf[0] == '\n') break;

                return NULL;

        }

        headers = procheader_get_header_array_asis(fp);

        sorted_headers = g_ptr_array_new();

        for (disphdr_list = prefs_common.disphdr_list; disphdr_list != NULL;

             disphdr_list = disphdr_list->next) {

                DisplayHeaderProp *dp =

                        (DisplayHeaderProp *)disphdr_list->data;

                for (i = 0; i < headers->len; i++) {

                        header = g_ptr_array_index(headers, i);

                        if (!g_strcasecmp(header->name, dp->name)) {

                                if (dp->hidden)

                                        procheader_header_free(header);

                                else

                                        g_ptr_array_add(sorted_headers, header);

                                g_ptr_array_remove_index(headers, i);

                                i--;

                        }

                }

        }

        if (prefs_common.show_other_header) {

                for (i = 0; i < headers->len; i++) {

                        header = g_ptr_array_index(headers, i);

                        g_ptr_array_add(sorted_headers, header);

                }

                g_ptr_array_free(headers, TRUE);

        } else

                procheader_header_array_destroy(headers);

        return sorted_headers;

}

static void textview_show_header(TextView *textview, GPtrArray *headers)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        Header *header;

        gint i;

        g_return_if_fail(headers != NULL);

        buffer = gtk_text_view_get_buffer(text);

        for (i = 0; i < headers->len; i++) {

                header = g_ptr_array_index(headers, i);

                g_return_if_fail(header->name != NULL);

                gtk_text_buffer_get_end_iter(buffer, &iter);

                gtk_text_buffer_insert_with_tags_by_name

                        (buffer, &iter, header->name, -1,

                         "header_title", "header", NULL);

                gtk_text_buffer_insert_with_tags_by_name

                        (buffer, &iter, ":", 1,

                         "header_title", "header", NULL);

                if (!g_strcasecmp(header->name, "Subject") ||

                    !g_strcasecmp(header->name, "From")    ||

                    !g_strcasecmp(header->name, "To")      ||

                    !g_strcasecmp(header->name, "Cc"))

                        unfold_line(header->body);

#if 0

                if (textview->text_is_mb == TRUE)

                        conv_unreadable_locale(header->body);

#endif

                if (prefs_common.enable_color &&

                    (!strncmp(header->name, "X-Mailer", 8) ||

                     !strncmp(header->name, "X-Newsreader", 12)) &&

                    strstr(header->body, "Sylpheed") != NULL) {

                        gtk_text_buffer_get_end_iter(buffer, &iter);

                        gtk_text_buffer_insert_with_tags_by_name

                                (buffer, &iter, header->body, -1,

                                 "header", "emphasis", NULL);

                } else if (prefs_common.enable_color) {

                        textview_make_clickable_parts

                                (textview, "header", "link", header->body);

                } else {

                        textview_make_clickable_parts

                                (textview, "header", NULL, header->body);

                }

                gtk_text_buffer_get_end_iter(buffer, &iter); //

                gtk_text_buffer_insert_with_tags_by_name

                        (buffer, &iter, "\n", 1, "header", NULL);

        }

}

gboolean textview_search_string(TextView *textview, const gchar *str,

                                gboolean case_sens)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkTextBuffer *buffer;

        GtkTextIter iter, end_iter;

        GtkTextMark *mark;

        gint pos;

        gint len;

        g_return_val_if_fail(str != NULL, FALSE);

        buffer = gtk_text_view_get_buffer(text);

        len = g_utf8_strlen(str, -1);

        g_return_val_if_fail(len >= 0, FALSE);

        mark = gtk_text_buffer_get_insert(buffer);

        gtk_text_buffer_get_iter_at_mark(buffer, &iter, mark);

        pos = gtk_text_iter_get_offset(&iter);

        if ((pos = gtkut_text_buffer_find(buffer, pos, str, case_sens)) != -1) {

                gtk_text_buffer_get_iter_at_offset(buffer, &end_iter, pos);

                gtk_text_buffer_get_iter_at_offset(buffer, &iter, pos + len);

                gtk_text_buffer_select_range(buffer, &iter, &end_iter);

                gtk_text_view_scroll_to_mark(text, mark, 0.0, FALSE, 0.0, 0.0);

                return TRUE;

        }

        return FALSE;

}

gboolean textview_search_string_backward(TextView *textview, const gchar *str,

                                         gboolean case_sens)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkTextBuffer *buffer;

        GtkTextIter iter, end_iter;

        GtkTextMark *mark;

        gint pos;

        gunichar *wcs;

        gint len;

        glong items_read = 0, items_written = 0;

        GError *error = NULL;

        gboolean found = FALSE;

        g_return_val_if_fail(str != NULL, FALSE);

        buffer = gtk_text_view_get_buffer(text);

        wcs = g_utf8_to_ucs4(str, -1, &items_read, &items_written, &error);

        if (error != NULL) {

                g_warning("An error occured while converting a string from UTF-8 to UCS-4: %s\n", error->message);

                g_error_free(error);

        }

        if (!wcs || items_written <= 0) return FALSE;

        len = (gint)items_written;

        mark = gtk_text_buffer_get_insert(buffer);

        gtk_text_buffer_get_iter_at_mark(buffer, &iter, mark);

        while (gtk_text_iter_backward_char(&iter)) {

                pos = gtk_text_iter_get_offset(&iter);

                if (gtkut_text_buffer_match_string

                        (buffer, pos, wcs, len, case_sens) == TRUE) {

                        gtk_text_buffer_get_iter_at_offset(buffer, &iter, pos);

                        gtk_text_buffer_get_iter_at_offset

                                (buffer, &end_iter, pos + len);

                        gtk_text_buffer_select_range(buffer, &iter, &end_iter);

                        gtk_text_view_scroll_to_mark

                                (text, mark, 0.0, FALSE, 0.0, 0.0);

                        found = TRUE;

                        break;

                }

        }

        g_free(wcs);

        return found;

}

void textview_scroll_one_line(TextView *textview, gboolean up)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkAdjustment *vadj = text->vadjustment;

        gfloat upper;

        if (prefs_common.enable_smooth_scroll) {

                textview_smooth_scroll_one_line(textview, up);

                return;

        }

        if (!up) {

                upper = vadj->upper - vadj->page_size;

                if (vadj->value < upper) {

                        vadj->value += vadj->step_increment;

                        vadj->value = MIN(vadj->value, upper);

                        g_signal_emit_by_name(G_OBJECT(vadj),

                                              "value_changed", 0);

                }

        } else {

                if (vadj->value > 0.0) {

                        vadj->value -= vadj->step_increment;

                        vadj->value = MAX(vadj->value, 0.0);

                        g_signal_emit_by_name(G_OBJECT(vadj),

                                              "value_changed", 0);

                }

        }

}

gboolean textview_scroll_page(TextView *textview, gboolean up)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkAdjustment *vadj = text->vadjustment;

        gfloat upper;

        gfloat page_incr;

        if (prefs_common.enable_smooth_scroll)

                return textview_smooth_scroll_page(textview, up);

        if (prefs_common.scroll_halfpage)

                page_incr = vadj->page_increment / 2;

        else

                page_incr = vadj->page_increment;

        if (!up) {

                upper = vadj->upper - vadj->page_size;

                if (vadj->value < upper) {

                        vadj->value += page_incr;

                        vadj->value = MIN(vadj->value, upper);

                        g_signal_emit_by_name(G_OBJECT(vadj),

                                              "value_changed", 0);

                } else

                        return FALSE;

        } else {

                if (vadj->value > 0.0) {

                        vadj->value -= page_incr;

                        vadj->value = MAX(vadj->value, 0.0);

                        g_signal_emit_by_name(G_OBJECT(vadj),

                                              "value_changed", 0);

                } else

                        return FALSE;

        }

        return TRUE;

}

static void textview_smooth_scroll_do(TextView *textview,

                                      gfloat old_value, gfloat last_value,

                                      gint step)

{

        GtkTextView *text = GTK_TEXT_VIEW(textview->text);

        GtkAdjustment *vadj = text->vadjustment;

        gint change_value;

        gboolean up;

        gint i;