#!/bin/bash
#
# Launch Preferred Mail Client
# Usage:
#	launchmail
#
# v4.0.0
# ------
# This script exists because gnome-open cannot launch the preferred mail client
# without a "mailto:" address parameter.  This script also attempts to run a mail
# client if GNOME's Preferred Application cannot be determined in cases where
# gconftool-2 is not installed.
#
# by Warren Togami <wtogami@redhat.com>
# (c) 2000-2006 Red Hat, Inc.
#
# This script is in the public domain.

error_dialog() {
    echo "$1"
    if [ -x /usr/bin/zenity ]; then
        /usr/bin/zenity --error --text="$1"
    else
        xmessage "$1"
    fi
}

mimic_gnome_open() {
    NEEDTERM=$(gconftool-2 -g /desktop/gnome/url-handlers/mailto/needs_terminal 2>/dev/null | sed -e 's/^\ *//; s/\ *$//')
    # Check if text-mode
    if [ "$NEEDTERM" == "true" ]; then
        PREFTERM=$(gconftool-2 -g /desktop/gnome/applications/terminal/exec 2>/dev/null | sed -e 's/^\ *//; s/\ *$//')
        TERMARGS=$(gconftool-2 -g /desktop/gnome/applications/terminal/exec_arg 2>/dev/null | sed -e 's/^\ *//; s/\ *$//')
        # Check if terminal exists
        if ! exists "$PREFTERM"; then
            error_dialog "ERROR: The terminal $PREFTERM does not exist.  Please reconfigure."
            [ -x /usr/bin/gnome-default-applications-properties ] && exec /usr/bin/gnome-default-applications-properties
            exit 1
        fi

        # Run text-mode
        exec $PREFTERM $TERMARGS $GCONF
    fi
    
    # Check if GUI client exists
    if ! exists "$GCONF"; then
        error_dialog "ERROR: The mail client $GCONF does not exist.  Please reconfigure."
        [ -x /usr/bin/gnome-default-applications-properties ] && exec /usr/bin/gnome-default-applications-properties
        exit 1
    fi
    if [ "$GCONF" = "seamonkey" ] && [ -z $1 ]; then
        GCONF="seamonkey -mail"
    fi
    if [ "$GCONF" = "evolution" ]; then
        GCONF="evolution --component=mail"
    fi

    # Run GUI client
    exec $GCONF
}

sanity_check() {
	unset INVALID
	echo "$1" | grep -q "launchmail" && INVALID="yes"
	echo "$1" | grep -q "gnome-open" && INVALID="yes"
	if [ "$INVALID" == "yes" ]; then
		error_dialog "$1 is an invalid mail client.  Please reconfigure."
		[ -x /usr/bin/gnome-default-applications-properties ] && exec /usr/bin/gnome-default-applications-properties
		exit 1
	fi
}

exists() {
    which "${1%% *}" 2> /dev/null > /dev/null
    return $?
}

# Attempt to run GNOME Preferred Application Mail Client
if [ -x /usr/bin/gconftool-2 -a -x /usr/bin/gnome-default-applications-properties ]; then
	# Pull key from gconf, remove %s or "%s", trim leading & trailing spaces
	GCONF=$(gconftool-2 -g /desktop/gnome/url-handlers/mailto/command 2>/dev/null | sed -e 's/%s//; s/\"\"//; s/^\ *//; s/\ *$//')

	# Remove arguments
	GCONF="`echo $GCONF | cut -f1 -d" "`"

	# sanity check (prevent infinite loops)
	sanity_check "$GCONF"

	# GNOME 2.4+ mimic gnome-open behavior to launch mail client
	if [ ! -z $DISPLAY ] &&  [ -x /usr/bin/gnome-open ]; then
		mimic_gnome_open "$*"
	fi
fi

# Fallback to *any* mail client if all the above failed
# usually because gconf and GNOME are not installed
CLIENTS="thunderbird kmail evolution seamonkey sylpheed balsa"
for client in $CLIENTS; do
    if exists "$client"; then
        if [ "$client" = "seamonkey" ] && [ -z $1 ]; then
            client="seamonkey -mail"
        fi
        if [ "$client" = "evolution" ]; then
            client="evolution --component=mail"
        fi
        exec "$client"
    fi
done

# No graphical mail clients, try text-mode mail clients
# first find a terminal...        
TERMINALS="gnome-terminal konsole urxvt rxvt aterm xterm"
for terminal in $TERMINALS; do
    exists "$terminal" && break
done
# find a client...
CLIENTS="mutt cone pine elm gnus" 
for client in $CLIENTS; do
    if exists "$client"; then
        exec $terminal -e $client
    fi
done

error_dialog "ERROR: No mail clients were found."
exit 1