[LAU] Jack command line connect

[Florian Schmidt]

On Friday 12 October 2007, Simon Williams wrote:
> In my attempt to stop the flipping xruns I get even from a really simple
> jack/fluidsynth (with 6.5mb soundfont) setup, I'm going to see if I can
> get it to run without xruns at all- so I'm going to stop the X server
> (which takes up quite a lot of cpu and memory).
>
> Before I can do this, I need to work out how on earth to connect
> fluidsynth to alsa_pcm without qjackctl. Why are there no man pages or
> --help or anything for jack_connect, etc? I've tried the obvious:
> "jack_connect fluidsynth alsa_pcm", but that doesn't work and without
> any usage information whatsoever I'm completely stuffed. Also, a command
> line list of port names that can be connected would be nice.

Add the stuff below to your bash auto completion setup [in ubuntu 
it's /etc/bash_completion.d/jackd]. This way you can simply use tab to 
autocomplete ports, e.g.:

~$ jack_connect [hit tab tab]
~$ jack_connect alsa_pcm\:capture_
alsa_pcm:capture_1   alsa_pcm:capture_2   alsa_pcm:capture_6
alsa_pcm:capture_10  alsa_pcm:capture_3   alsa_pcm:capture_7
alsa_pcm:capture_11  alsa_pcm:capture_4   alsa_pcm:capture_8
alsa_pcm:capture_12  alsa_pcm:capture_5   alsa_pcm:capture_9



#-*- mode: shell-script;-*-
# Inputs:
#   $1 -- name of the command whose arguments are being completed
#   $2 -- word being completed
#   $3 -- word preceding the word being completed
#   $COMP_LINE  -- current command line
#   $COMP_PONT  -- cursor position
#   $COMP_WORDS -- array containing individual words in the current
#                  command line
#   $COMP_CWORD -- index into ${COMP_WORDS} of the word containing the
#                  current cursor position
# Output:
#   COMPREPLY array variable contains possible completions

# Syntax:
#   jack_connect <src_port> <dst_port> 
#   jack_disconnect <src_port> <dst_port> 
#   jackd [options] -d backend [backend-parameters]
#   jackstart [options] -d backend [backend-parameters]

# Bugs/Todo:
#   jack_{dis,}connect should support for spaces in port names
#   restrict jack_disconnect completions to existing connections

# Bugreports: Paul Brossier <piem at altern.org>

have jack_connect &&
_jack_lsp_type() {
 jack_lsp -p 2>/dev/null | grep -B1 $1 | \
        grep -v 'properties.*,$' | grep -v ^-- \
		| sed 's/\([\/ :]\)/\\\1/g'
		#| sed 's/\([\\: ]\)/\\\1/g'
		#| sed 's/\(.*\)/"\1"/g'
}

have jackd &&
_jackd_driver_help() {
 jackd -d $1 --help 2> /dev/null | grep - | \
        sed 's/-\(.*\), --\([^\ .]*\) *\(.*\)/-\1 --\2/'
}

have jack_connect &&
_jack_connections() {

        local cur prev output IFS=$'\n'

	COMPREPLY=()
	cur=${COMP_WORDS[COMP_CWORD]}
	prev=${COMP_WORDS[COMP_CWORD-1]}

        # check if this is the first argument
	if [[ "$1" == "$prev" ]]; then
		COMPREPLY=( $( compgen -W "$(_jack_lsp_type output)" -- $cur ) )
	else
		COMPREPLY=( $( compgen -W "$(_jack_lsp_type  input)" -- $cur ) )
        fi

	return 0

}

have jackd &&
_jackd()
{
        local cur prev special

        COMPREPLY=()
        cur=${COMP_WORDS[COMP_CWORD]}
        prev=${COMP_WORDS[COMP_CWORD-1]}

        # check if backend was specified
	for (( i=0; i < ${#COMP_WORDS[@]}-1; i++ )); do
		if [[ ${COMP_WORDS[i]} == @(alsa|dummy|oss|coreaudio|portaudio) ]]; then
			special=${COMP_WORDS[i]}
		fi
	done

        # list backends 
        if [[ "$prev" == -d || "$prev" == --driver ]]; then
                COMPREPLY=( $( compgen -W 'alsa dummy oss coreaudio 
portaudio' -- $cur ) )
        # list backend specific options
        elif [ -n "$special" ]; then
                COMPREPLY=( $( compgen -W '`_jackd_driver_help 
$special` --help' -- $cur ) )
        # list common options
        else
                COMPREPLY=( $( compgen -W '--help -h \
			--driver -d \
			--realtime -R \
			--realtime-priority -P \
			--name -n \
			--no-mlock -m \
			--unlock -u \
			--timeout -t \
			--port-max -p \
			--verbose -v \
			--silent -s \
			--version -V' -- $cur ) ) 
        fi

        return 0
}

[ "$have" ] && complete -F _jack_connections $filenames jack_connect 
[ "$have" ] && complete -F _jack_connections $filenames jack_disconnect 
[ "$have" ] && complete -F _jackd $filenames jackd
[ "$have" ] && complete -F _jackd $filenames jackstart



-- 
Palimm Palimm!
http://tapas.affenbande.org