xdg-open

#!/bin/sh
#---------------------------------------------
#   xdg-open
#
#   Utility script to open a URL in the registered default application.
#
#   Refer to the usage() function below for usage.
#
#   Copyright 2009-2010, Fathi Boudra <fabo@freedesktop.org>
#   Copyright 2009-2010, Rex Dieter <rdieter@fedoraproject.org>
#   Copyright 2006, Kevin Krammer <kevin.krammer@gmx.at>
#   Copyright 2006, Jeremy White <jwhite@codeweavers.com>
#
#   LICENSE:
#
#   Permission is hereby granted, free of charge, to any person obtaining a
#   copy of this software and associated documentation files (the "Software"),
#   to deal in the Software without restriction, including without limitation
#   the rights to use, copy, modify, merge, publish, distribute, sublicense,
#   and/or sell copies of the Software, and to permit persons to whom the
#   Software is furnished to do so, subject to the following conditions:
#
#   The above copyright notice and this permission notice shall be included
#   in all copies or substantial portions of the Software.
#
#   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
#   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
#   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
#   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
#   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
#   OTHER DEALINGS IN THE SOFTWARE.
#
#---------------------------------------------

manualpage()
{
cat << _MANUALPAGE
Name

   xdg-open - opens a file or URL in the user's preferred
   application

Synopsis

   xdg-open { file | URL }

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

Description

   xdg-open opens a file or URL in the user's preferred
   application. If a URL is provided the URL will be opened in the
   user's preferred web browser. If a file is provided the file
   will be opened in the preferred application for files of that
   type. xdg-open supports file, ftp, http and https URLs.

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

Options

   --help
          Show command synopsis.

   --manual
          Show this manual page.

   --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.

   2
          One of the files passed on the command line did not
          exist.

   3
          A required tool could not be found.

   4
          The action failed.

Examples

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

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

xdg-open /tmp/foobar.png

   Opens the PNG image file /tmp/foobar.png in the user's default
   image viewing application.
_MANUALPAGE
}

usage()
{
cat << _USAGE
   xdg-open - opens a file or URL in the user's preferred
   application

Synopsis

   xdg-open { file | URL }

   xdg-open { --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
}

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

#-------------------------------------------------------------
# map a binary to a .desktop file
binary_to_desktop_file()
{
    search="${XDG_DATA_HOME:-$HOME/.local/share}:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
    binary="`which "$1"`"
    binary="`readlink -f "$binary"`"
    base="`basename "$binary"`"
    IFS=:
    for dir in $search; do
        unset IFS
        [ "$dir" ] || continue
        [ -d "$dir/applications" ] || [ -d "$dir/applnk" ] || continue
        for file in "$dir"/applications/*.desktop "$dir"/applications/*/*.desktop "$dir"/applnk/*.desktop "$dir"/applnk/*/*.desktop; do
            [ -r "$file" ] || continue
            # Check to make sure it's worth the processing.
            grep -q "^Exec.*$base" "$file" || continue
            # Make sure it's a visible desktop file (e.g. not "preferred-web-browser.desktop").
            grep -Eq "^(NoDisplay|Hidden)=true" "$file" && continue
            command="`grep -E "^Exec(\[[^]=]*])?=" "$file" | cut -d= -f 2- | first_word`"
            command="`which "$command"`"
            if [ x"`readlink -f "$command"`" = x"$binary" ]; then
                # Fix any double slashes that got added path composition
                echo "$file" | sed -e 's,//*,/,g'
                return
            fi
        done
    done
}

#-------------------------------------------------------------
# map a .desktop file to a binary
## FIXME: handle vendor dir case
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" ] && [ -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
}

#-------------------------------------------------------------
# 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-open: $@" >&2
        echo "Try 'xdg-open --help' for more information." >&2
    else
        usage
        echo "Use 'man xdg-open' or 'xdg-open --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-open: $@" >&2
    fi

    exit 2
}

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

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

    exit 3
}

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

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

    exit 5
}

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

exit_failure_file_permission_write()
{
    if [ $# -gt 0 ]; then
        echo "xdg-open: $@" >&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
       [[:alpha:]]*-*)
         return
         ;;
    esac

    echo "xdg-open: $file_label '$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-open --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" ] || [ ! -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-open' or 'xdg-open --manual' for additional info."
            exit_success
            ;;

            --manual)
            manualpage
            exit_success
            ;;

            --version)
            echo "xdg-open 1.1.0 rc3"
            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()
{
    # see https://bugs.freedesktop.org/show_bug.cgi?id=34164
    unset GREP_OPTIONS

    if [ -n "${XDG_CURRENT_DESKTOP}" ]; then
      case "${XDG_CURRENT_DESKTOP}" in
         ENLIGHTENMENT)
           DE=enlightenment;
           ;;
         GNOME)
           DE=gnome;
           ;;
         KDE)
           DE=kde;
           ;;
         LXDE)
           DE=lxde;
           ;;
         MATE)
           DE=mate;
           ;;
         XFCE)
           DE=xfce
           ;;
      esac
    fi

    if [ x"$DE" = x"" ]; then
      # classic fallbacks
      if [ x"$KDE_FULL_SESSION" != x"" ]; then DE=kde;
      elif [ x"$GNOME_DESKTOP_SESSION_ID" != x"" ]; then DE=gnome;
      elif [ x"$MATE_DESKTOP_SESSION_ID" != x"" ]; then DE=mate;
      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 _DT_SAVE_MODE 2> /dev/null | grep ' = \"xfce4\"$' >/dev/null 2>&1; then DE=xfce;
      elif xprop -root 2> /dev/null | grep -i '^xfce_desktop_window' >/dev/null 2>&1; then DE=xfce
      elif echo $DESKTOP | grep -q '^Enlightenment'; then DE=enlightenment;
      fi
    fi

    if [ x"$DE" = x"" ]; then
      # fallback to checking $DESKTOP_SESSION
      case "$DESKTOP_SESSION" in
         gnome)
           DE=gnome;
           ;;
         LXDE|Lubuntu)
           DE=lxde; 
           ;;
         MATE)
           DE=mate;
           ;;
         xfce|xfce4|'Xfce Session')
           DE=xfce;
           ;;
      esac
    fi

    if [ x"$DE" = x"" ]; then
      # fallback to uname output for other platforms
      case "$(uname 2>/dev/null)" in 
        Darwin)
          DE=darwin;
          ;;
      esac
    fi

    if [ x"$DE" = x"gnome" ]; then
      # gnome-default-applications-properties is only available in GNOME 2.x
      # but not in GNOME 3.x
      which gnome-default-applications-properties > /dev/null 2>&1  || DE="gnome3"
    fi
}

#----------------------------------------------------------------------------
# kfmclient exec/openURL can give bogus exit value in KDE <= 3.5.4
# It also always returns 1 in KDE 3.4 and earlier
# Simply return 0 in such case

kfmclient_fix_exit_code()
{
    version=`LC_ALL=C.UTF-8 kde-config --version 2>/dev/null | grep '^KDE'`
    major=`echo $version | sed 's/KDE.*: \([0-9]\).*/\1/'`
    minor=`echo $version | sed 's/KDE.*: [0-9]*\.\([0-9]\).*/\1/'`
    release=`echo $version | sed 's/KDE.*: [0-9]*\.[0-9]*\.\([0-9]\).*/\1/'`
    test "$major" -gt 3 && return $1
    test "$minor" -gt 5 && return $1
    test "$release" -gt 4 && return $1
    return 0
}

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

# Get the value of a key in a desktop file's Desktop Entry group.
# Example: Use get_key foo.desktop Exec
# to get the values of the Exec= key for the Desktop Entry group.
get_key()
{
    local file="${1}"
    local key="${2}"
    local desktop_entry=""

    IFS_="${IFS}"
    IFS=""
    while read line
    do
        case "$line" in
            "[Desktop Entry]")
                desktop_entry="y"
            ;;
            # Reset match flag for other groups
            "["*)
                desktop_entry=""
            ;;
            "${key}="*)
                # Only match Desktop Entry group
                if [ -n "${desktop_entry}" ]
                then
                    echo "${line}" | cut -d= -f 2-
                fi
        esac
    done < "${file}"
    IFS="${IFS_}"
}

open_darwin()
{
    open "$1"

    if [ $? -eq 0 ]; then
        exit_success
    else
        exit_failure_operation_failed
    fi
}

open_kde()
{
    if [ -n "${KDE_SESSION_VERSION}" ]; then
      case "${KDE_SESSION_VERSION}" in
        4)
          kde-open "$1"
        ;;
        5)
          kde-open${KDE_SESSION_VERSION} "$1"
        ;;
      esac
    else
        kfmclient exec "$1"
        kfmclient_fix_exit_code $?
    fi

    if [ $? -eq 0 ]; then
        exit_success
    else
        exit_failure_operation_failed
    fi
}

open_gnome()
{
    if gvfs-open --help 2>/dev/null 1>&2; then
        gvfs-open "$1"
    else
        gnome-open "$1"
    fi

    if [ $? -eq 0 ]; then
        exit_success
    else
        exit_failure_operation_failed
    fi
}

open_mate()
{
    if gvfs-open --help 2>/dev/null 1>&2; then
        gvfs-open "$1"
    else
        mate-open "$1"
    fi

    if [ $? -eq 0 ]; then
        exit_success
    else
        exit_failure_operation_failed
    fi
}

open_xfce()
{
    exo-open "$1"

    if [ $? -eq 0 ]; then
        exit_success
    else
        exit_failure_operation_failed
    fi
}

open_enlightenment()
{
    enlightenment_open "$1"

    if [ $? -eq 0 ]; then
        exit_success
    else
        exit_failure_operation_failed
    fi
}

#-----------------------------------------
# Recursively search .desktop file

search_desktop_file()
{
    local default="$1"
    local dir="$2"
    local target="$3"

    local file=""
    # look for both vendor-app.desktop, vendor/app.desktop
    if [ -r "$dir/$default" ]; then
      file="$dir/$default"
    elif [ -r "$dir/`echo $default | sed -e 's|-|/|'`" ]; then
      file="$dir/`echo $default | sed -e 's|-|/|'`"
    fi

    if [ -r "$file" ] ; then
        command="$(get_key "${file}" "Exec" | first_word)"
        command_exec=`which $command 2>/dev/null`
        icon="$(get_key "${file}" "Icon")"
        # FIXME: Actually LC_MESSAGES should be used as described in
        # http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s04.html
        localised_name="$(get_key "${file}" "Name")"
        set -- $(get_key "${file}" "Exec" | last_word)
        # We need to replace any occurrence of "%f", "%F" and
        # the like by the target file. We examine each
        # argument and append the modified argument to the
        # end then shift.
        local args=$#
        local replaced=0
        while [ $args -gt 0 ]; do
            case $1 in
                %[c])
                    replaced=1
                    arg="${localised_name}"
                    shift
                    set -- "$@" "$arg"
                    ;;
                %[fFuU])
                    replaced=1
                    arg="$target"
                    shift
                    set -- "$@" "$arg"
                    ;;
                %[i])
                    replaced=1
                    shift
                    set -- "$@" "--icon" "$icon"
                    ;;
                *)
                    arg="$1"
                    shift
                    set -- "$@" "$arg"
                    ;;
            esac
            args=$(( $args - 1 ))
        done
        [ $replaced -eq 1 ] || set -- "$@" "$target"
        "$command_exec" "$@"

        if [ $? -eq 0 ]; then
            exit_success
        fi
    fi

    for d in $dir/*/; do
        [ -d "$d" ] && search_desktop_file "$default" "$d" "$target"
    done
}


open_generic_xdg_mime()
{
    filetype="$2"
    default=`xdg-mime query default "$filetype"`
    if [ -n "$default" ] ; then
        xdg_user_dir="$XDG_DATA_HOME"
        [ -n "$xdg_user_dir" ] || xdg_user_dir="$HOME/.local/share"

        xdg_system_dirs="$XDG_DATA_DIRS"
        [ -n "$xdg_system_dirs" ] || xdg_system_dirs=/usr/local/share/:/usr/share/

DEBUG 3 "$xdg_user_dir:$xdg_system_dirs"
        for x in `echo "$xdg_user_dir:$xdg_system_dirs" | sed 's/:/ /g'`; do
            search_desktop_file "$default" "$x/applications/" "$1"
        done
    fi
}

open_generic_xdg_file_mime()
{
    filetype=`xdg-mime query filetype "$1" | sed "s/;.*//"`
    open_generic_xdg_mime "$1" "$filetype"
}

open_generic_xdg_x_scheme_handler()
{
    scheme="`echo $1 | sed -n 's/\(^[[:alnum:]+\.-]*\):.*$/\1/p'`"
    if [ -n $scheme ]; then
        filetype="x-scheme-handler/$scheme"
        open_generic_xdg_mime "$1" "$filetype"
    fi
}

open_generic()
{
    # Paths or file:// URLs
    if (echo "$1" | grep -q '^file://' ||
        ! echo "$1" | egrep -q '^[[:alpha:]+\.\-]+:'); then

        local file="$1"

        # Decode URLs
        if echo "$file" | grep -q '^file:///'; then
            file=${file#file://}
            file="$(printf "$(echo "$file" | sed -e 's@%\([a-f0-9A-F]\{2\}\)@\\x\1@g')")"
        fi
        file_check=${file%%#*}
        file_check=${file_check%%\?*}
        check_input_file "$file_check"

        filetype=`xdg-mime query filetype "$file_check" | sed "s/;.*//"`
        open_generic_xdg_mime "$file" "$filetype"

        if which run-mailcap 2>/dev/null 1>&2; then
            run-mailcap --action=view "$file"
            if [ $? -eq 0 ]; then
                exit_success
            fi
        fi

        if mimeopen -v 2>/dev/null 1>&2; then
            mimeopen -L -n "$file"
            if [ $? -eq 0 ]; then
                exit_success
            fi
        fi
    fi

    open_generic_xdg_x_scheme_handler "$1"

    IFS=":"
    for browser in $BROWSER; do
        if [ x"$browser" != x"" ]; then

            browser_with_arg=`printf "$browser" "$1" 2>/dev/null`
            if [ $? -ne 0 ]; then
                browser_with_arg=$browser;
            fi

            if [ x"$browser_with_arg" = x"$browser" ]; then
                eval '$browser "$1"'$xdg_redirect_output;
            else eval '$browser_with_arg'$xdg_redirect_output;
            fi

            if [ $? -eq 0 ]; then
                exit_success;
            fi
        fi
    done

    exit_failure_operation_impossible "no method available for opening '$1'"
}

open_lxde()
{
    # pcmanfm only knows how to handle file:// urls and filepaths, it seems.
    if (echo "$1" | grep -q '^file://' ||
        ! echo "$1" | egrep -q '^[[:alpha:]+\.\-]+:')
    then
        local file="$1"

        # handle relative paths
        if ! echo "$file" | egrep -q '^(file://)?/'; then
            file="$(pwd)/$file"
        fi

        pcmanfm "$file"

    else
        open_generic "$1"
    fi

    if [ $? -eq 0 ]; then
        exit_success
    else
        exit_failure_operation_failed
    fi
}

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

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

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

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

if [ -z "${url}" ] ; then
    exit_failure_syntax "file or URL argument missing"
fi

detectDE

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

DEBUG 2 "Selected DE $DE"

# sanitize BROWSER (avoid caling ourselves in particular)
case "${BROWSER}" in
    *:"xdg-open"|"xdg-open":*)
        BROWSER=$(echo $BROWSER | sed -e 's|:xdg-open||g' -e 's|xdg-open:||g')
        ;;
    "xdg-open")
        BROWSER=
        ;;
esac

# if BROWSER variable is not set, check some well known browsers instead
if [ x"$BROWSER" = x"" ]; then
    BROWSER=links2:elinks:links:lynx:w3m
    if [ -n "$DISPLAY" ]; then
        BROWSER=x-www-browser:firefox:seamonkey:mozilla:epiphany:konqueror:chromium-browser:google-chrome:$BROWSER
    fi
fi

case "$DE" in
    kde)
    open_kde "$url"
    ;;

    gnome*)
    open_gnome "$url"
    ;;

    mate)
    open_mate "$url"
    ;;

    xfce)
    open_xfce "$url"
    ;;

    lxde)
    open_lxde "$url"
    ;;

    enlightenment)
    open_enlightenment "$url"
    ;;

    generic)
    open_generic "$url"
    ;;

    *)
    exit_failure_operation_impossible "no method available for opening '$url'"
    ;;
esac