#!/bin/sh
#---------------------------------------------
#   xdg-browser
#

manualpage()
{
cat << _MANUALPAGE
Name

xdg-browser - opens the user's preferred browser application

Synopsis

xdg-browser [URL]

xdg-browser { --help | --manual | --version }

Description

xdg-browser opens the user's preferred browser application. If a URL is
provided the URL will be opened in the user's preferred web browser.

xdg-browser is for use inside a desktop session only. It is not recommended to
use xdg-browser as root.

Options

--help
    Show command synopsis.
--manual
    Show this manualpage.
--version
    Show the xdg-utils version information.

Exit Codes

An exit code of 0 indicates success while a non-zero exit code indicates
failure. The following failure codes can be returned:

1
    Error in command line syntax.
3
    A required tool could not be found.
4
    The action failed.

Examples

xdg-browser

Opens the user's default browser application

xdg-browser 'http://www.freedesktop.org/'

Opens the Freedesktop.org website in the user's default browser

_MANUALPAGE
}

usage()
{
cat << _USAGE
xdg-browser - opens the user's preferred browser application

Synopsis

xdg-browser [URL]

xdg-browser { --help | --manual | --version }

_USAGE
}

#@xdg-utils-common@

#----------------------------------------------------------------------------
#   Common utility functions included in all XDG wrapper scripts
#----------------------------------------------------------------------------

DEBUG()
{
  [ -z "${XDG_UTILS_DEBUG_LEVEL}" ] && return 0;
  [ ${XDG_UTILS_DEBUG_LEVEL} -lt $1 ] && return 0;
  shift
  echo "$@" >&2
}

#-------------------------------------------------------------
# Exit script on successfully completing the desired operation

exit_success()
{
    if [ $# -gt 0 ]; then
        echo "$@"
        echo
    fi

    exit 0
}


#-----------------------------------------
# Exit script on malformed arguments, not enough arguments
# or missing required option.
# prints usage information

exit_failure_syntax()
{
    if [ $# -gt 0 ]; then
        echo "xdg-browser: $@" >&2
        echo "Try 'xdg-browser --help' for more information." >&2
    else
        usage
        echo "Use 'man xdg-browser' or 'xdg-browser --manual' for additional info."
    fi

    exit 1
}

#-------------------------------------------------------------
# Exit script on missing file specified on command line

exit_failure_file_missing()
{
    if [ $# -gt 0 ]; then
        echo "xdg-browser: $@" >&2
    fi

    exit 2
}

#-------------------------------------------------------------
# Exit script on failure to locate necessary tool applications

exit_failure_operation_impossible()
{
    if [ $# -gt 0 ]; then
        echo "xdg-browser: $@" >&2
    fi

    exit 3
}

#-------------------------------------------------------------
# Exit script on failure returned by a tool application

exit_failure_operation_failed()
{
    if [ $# -gt 0 ]; then
        echo "xdg-browser: $@" >&2
    fi

    exit 4
}

#------------------------------------------------------------
# Exit script on insufficient permission to read a specified file

exit_failure_file_permission_read()
{
    if [ $# -gt 0 ]; then
        echo "xdg-browser: $@" >&2
    fi

    exit 5
}

#------------------------------------------------------------
# Exit script on insufficient permission to read a specified file

exit_failure_file_permission_write()
{
    if [ $# -gt 0 ]; then
        echo "xdg-browser: $@" >&2
    fi

    exit 6
}

check_input_file()
{
    if [ ! -e "$1" ]; then
        exit_failure_file_missing "file '$1' does not exist"
    fi
    if [ ! -r "$1" ]; then
        exit_failure_file_permission_read "no permission to read file '$1'"
    fi
}

check_vendor_prefix()
{
    file_label="$2"
    [ -n "$file_label" ] || file_label="filename"
    file=`basename "$1"`
    case "$file" in
       [a-zA-Z]*-*)
         return
         ;;
    esac

    echo "xdg-browser: $file_label '$file' does not have a proper vendor prefix" >&2
    echo 'A vendor prefix consists of alpha characters ([a-zA-Z]) and is terminated' >&2
    echo 'with a dash ("-"). An example '"$file_label"' is '"'example-$file'" >&2
    echo "Use --novendor to override or 'xdg-browser --manual' for additional info." >&2
    exit 1
}

check_output_file()
{
    # if the file exists, check if it is writeable
    # if it does not exists, check if we are allowed to write on the directory
    if [ -e "$1" ]; then
        if [ ! -w "$1" ]; then
            exit_failure_file_permission_write "no permission to write to file '$1'"
        fi
    else
        DIR=`dirname "$1"`
        if [ ! -w "$DIR" -o ! -x "$DIR" ]; then
            exit_failure_file_permission_write "no permission to create file '$1'"
        fi
    fi
}

#----------------------------------------
# Checks for shared commands, e.g. --help

check_common_commands()
{
    while [ $# -gt 0 ] ; do
        parm="$1"
        shift

        case "$parm" in
            --help)
            usage
            echo "Use 'man xdg-browser' or 'xdg-browser --manual' for additional info."
            exit_success
            ;;

            --manual)
            manualpage
            exit_success
            ;;

            --version)
            echo "xdg-browser 0.0.1"
            exit_success
            ;;
        esac
    done
}

check_common_commands "$@"

[ -z "${XDG_UTILS_DEBUG_LEVEL}" ] && unset XDG_UTILS_DEBUG_LEVEL;
if [ ${XDG_UTILS_DEBUG_LEVEL-0} -lt 1 ]; then
    # Be silent
    xdg_redirect_output=" > /dev/null 2> /dev/null"
else
    # All output to stderr
    xdg_redirect_output=" >&2"
fi

#--------------------------------------
# Checks for known desktop environments
# set variable DE to the desktop environments name, lowercase

detectDE()
{
    if [ x"$KDE_FULL_SESSION" = x"true" ]; then DE=kde;
    elif [ x"$GNOME_DESKTOP_SESSION_ID" != x"" ]; then DE=gnome;
    elif `dbus-send --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.GetNameOwner string:org.gnome.SessionManager > /dev/null 2>&1` ; then DE=gnome;
    elif xprop -root | grep -qw XFCE_DESKTOP_WINDOW 2>&1; then DE=xfce;
    elif [ x"$DESKTOP_SESSION" == x"LXDE" ]; then DE=lxde;
    else DE=""
    fi

    echo $DE
}

## Utility functions

# This handles backslashes but not quote marks.
first_word()
{
    read first rest
    echo "$first"
}

desktop_file_to_binary()
{
    search="${XDG_DATA_HOME:-$HOME/.local/share}:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
    desktop="`basename "$1"`"
    IFS=:
    for dir in $search; do
        unset IFS
        [ "$dir" -a -d "$dir/applications" ] || continue
        file="$dir/applications/$desktop"
        [ -r "$file" ] || continue
        # Remove any arguments (%F, %f, %U, %u, etc.).
        command="`grep -E "^Exec(\[[^]=]*])?=" "$file" | cut -d= -f 2- | first_word`"
        command="`which "$command"`"
        readlink -f "$command"
        return
    done
}

### Browser functions

browser_kde()
{
    browser="`kreadconfig --file kdeglobals --group General --key BrowserApplication`"

    if [ x"$browser" = x ]; then
        # kreadconfig in KDE 4 may not notice Key[$*]=... localized settings, so
        # check by hand if it didn't find anything (oddly kwriteconfig works
        # fine though).
        kdeglobals_dir=`kde${KDE_SESSION_VERSION}-config --path config  | cut -d ':' -f 1`
        kdeglobals="$kdeglobals_dir/kdeglobals"
        [ ! -f "$kdeglobals" ] && return
        # This will only take the first value if there is more than one.
        browser="`grep '^BrowserApplication\[$[^]=]*\]=' "$kdeglobals" | head -n 1 | cut -d= -f 2-`"
    fi

    # Kde returns in two ways. One with a prefix (i.g !firefox)
    # The other one with a desktop suffix (i.g chromium-browser.desktop)

    case "$browser" in
      !*)
        browser="${browser#!}"
        browser_exec=`type -p $browser`
        ;;
      *)
        browser_exec="`desktop_file_to_binary "$browser"`"
        ;;
    esac

    if [ -x "$browser_exec" ]; then
        if [ x"$1" == x"" ]; then
            $browser_exec
        else
            $browser_exec "$1"
        fi

        if [ $? -eq 0 ]; then
            exit_success
        else
            exit_failure_operation_failed
        fi
    else
        exit_failure_operation_impossible "configured browser program '$browser' not found or not executable"
    fi
}

browser_gnome()
{
    browser="`gconftool-2 --get /desktop/gnome/applications/browser/exec | first_word`"

    browser_exec=`type -p $browser`

    if [ -x "$browser_exec" ]; then
        if [ x"$1" == x"" ]; then
            $browser_exec
        else
            $browser_exec "$1"
        fi

        if [ $? -eq 0 ]; then
            exit_success
        else
            exit_failure_operation_failed
        fi
    else
        exit_failure_operation_impossible "configured browser program '$browser' not found or not executable"
    fi
}

browser_xfce()
{
    browser_exec="`exo-open --launch WebBrowser`"

    if [ -x "$browser_exec" ]; then
        if [ x"$1" == x"" ]; then
            $browser_exec
        else
            $browser_exec "$1"
        fi

        if [ $? -eq 0 ]; then
            exit_success
        else
            exit_failure_operation_failed
        fi
    else
        exit_failure_operation_impossible "configured browser program '$browser' not found or not executable"
    fi
}

browser_lxde()
{

    search="${XDG_CONFIG_HOME:-$HOME/.config}"
    for dir in $search; do
        file="$dir/libfm/pref-apps.conf"
        [ -r "$file" ] || continue
        grep -q "^CustomWebBrowsers=" "$file" || continue
        desktop="`grep "^CustomWebBrowsers=" "$file" | cut -d= -f 2-`"
        #Lxde append a ; characters to the lines
        desktop="${desktop%;}"
        browser_exec="`desktop_file_to_binary "$desktop"`"
    done

    if [ -x "$browser_exec" ]; then
        if [ x"$1" == x"" ]; then
            $browser_exec
        else
            $browser_exec "$1"
        fi

        if [ $? -eq 0 ]; then
            exit_success
        else
            exit_failure_operation_failed
        fi
    else
        exit_failure_operation_impossible "configured browser program '$browser' not found or not executable"
    fi
}

browser_generic()
{
    # if browser variable is not set, check some well known browsers instead
    if [ x"$browser" = x"" ]; then
        browser=links2:links:lynx:w3m
        if [ -n "$DISPLAY" ]; then
            browser=firefox:mozilla:epiphany:konqueror:chromium-browser:google-chrome:opera:midori:$browser
        fi
    fi

    browser_exec=`type -p $browser`

    if [ -x "$browser_exec" ]; then
        if [ $? -eq 0 ]; then
            exit_success
        else
            exit_failure_operation_failed
        fi
    else
        exit_failure_operation_impossible "configured browser program '$browser' not found or not executable"
    fi
}

#[ x"$1" != x"" ] || exit_failure_syntax

command=
while [ $# -gt 0 ] ; do
    parm="$1"
    shift

    case "$parm" in
      -*)
        exit_failure_syntax "unexpected option '$parm'"
        ;;

      *)
        if [ -n "$command" ] ; then
            exit_failure_syntax "unexpected argument '$parm'"
        fi
        command="$parm"
        ;;
    esac
done

detectDE

if [ x"$DE" = x"" ]; then
    DE=generic
fi

case "$DE" in
    kde)
    browser_kde "$command"
    ;;

    gnome)
    browser_gnome "$command"
    ;;

    xfce)
    browser_xfce "$command"
    ;;

    lxde)
    browser_lxde "$command"
    ;;

    generic)
    browser_generic "$command"
    ;;

    *)
    exit_failure_operation_impossible "no browser application available"
    ;;
esac