diff options
Diffstat (limited to 'contrib/headless_pianobar')
| -rwxr-xr-x | contrib/headless_pianobar | 218 |
1 files changed, 148 insertions, 70 deletions
diff --git a/contrib/headless_pianobar b/contrib/headless_pianobar index 20f8a54..d520200 100755 --- a/contrib/headless_pianobar +++ b/contrib/headless_pianobar @@ -56,49 +56,66 @@ # techniques and currently requires bash. -# This script regularly checks whether or not pianobar is running in the -# background in order to detect when it closes. This variable sets how long of -# a delay there will be between checks (in seconds). +# Set default config options, as defined in the pianobar man page. Only set for variables actually used. +# They can all be overridden by the main pianobar config file. +# headless_pianobar options: +# check_period: sets how frequently the script checks if pianobar is running +# output_lines: sets how many lines of pianobar output to print when reconnecting CHECK_PERIOD=${CHECK_PERIOD:-"1"} - -# This variable will set how many lines of pianobar's output to print when -# re-connecting to pianobar. OUTPUT_LINES=${OUTPUT_LINES:-"30"} +ACT_SONGPLAY=P +ACT_SONGPAUSETOGGLE=p +ACT_SONGPAUSETOGGLE2=' ' # space +XDG_CONFIG_HOME=${XDG_CONFIG_HOME:-$HOME/.config} +FIFO=$XDG_CONFIG_HOME/pianobar/ctl +OUT=$XDG_CONFIG_HOME/pianobar/out +CONFIG=$XDG_CONFIG_HOME/pianobar/config -# Ensure the ctrl fifo exists. -if [ ! -p $HOME/.config/pianobar/ctl ] -then - echo "pianobar ctl fifo not present at $HOME/.config/pianobar/ctl" - echo -n "Create? (y/N) " - read YN - if [ "$YN" = "y" ] || [ "$YN" = "yes" ] || [ "$YN" = "Y" ] || [ "$YN" = "YES" ] - then - mkdir -p $HOME/.config/pianobar/ - mkfifo $HOME/.config/pianobar/ctl - if [ ! -p $HOME/.config/pianobar/ctl ] - then - echo "Failed to create fifo, aborting" - exit 1 - fi - else - exit 1 - fi -fi + +# Load the pianobar config file as bash variables +# also strip password info for security reasons +# ex: act_upcoming becomes ACT_UPCOMING +# ex: user becomes PIANOBAR_USER (in order to avoid conflicts with the user environment variable) +load_config(){ + if [[ -r $CONFIG ]] + then + source <(sed -n \ + -e 's/password.*//' \ + -e 's/user/pianobar_user/' \ + -e 's/\([0-9A-Za-z_]*\) = \(.*\)/\U\1\E="\2"/p' < $CONFIG) + else + echo "Couldn't load config file $CONFIG, using defaults" + false + fi +} + +is_running(){ + ps -u $(id -u) -o comm | grep -q "^pianobar$" +} # Launch pianobar if it is not already running. -if ! ps -u $(id -u) -o comm | grep -q "^pianobar$" -then - echo "pianobar not running, launching pianobar" - nohup pianobar &>$HOME/.config/pianobar/out &disown - sleep 1 -fi +launch(){ + if ! is_running + then + ensure_fifo true + echo "Pianobar not running, launching Pianobar" + nohup pianobar &>$OUT &disown + sleep 1 + else + ensure_fifo + fi +} -# Sanity check: ensure pianobar's output can be read. -if [ ! -f $HOME/.config/pianobar/out ] -then - echo "pianobar does not seem to be outputting to $HOME/.config/pianobar/out, try killing it and starting $0 again" - exit 2 -fi +# Check on a regular basis that pianobar is still running. +# If pianobar stops running, stop this script as well. +running(){ + while is_running + do + sleep $CHECK_PERIOD + done + echo "Pianobar died, quitting" + quit +} # Function to cleanly quit. Ensures that the two backgrounded processes (the # output, tail, and the check, running()) both exit along with the parent (this @@ -120,44 +137,105 @@ quit(){ exit 0 } -# Check on a regular basis that pianobar is still running. -# If pianobar stops running, stop this script as well. -running(){ - while ps -u $(id -u) -o comm | grep -q "^pianobar$" - do - sleep $CHECK_PERIOD - done - echo "pianobar died, quitting" - quit -} - -# Ensure quit() is called to clean up when exiting -trap quit HUP INT TERM - # Print pianobar's output. -tail -n$OUTPUT_LINES -f $HOME/.config/pianobar/out & -TAILPID=$! +output(){ + # Sanity check: ensure pianobar's output can be read. + if [ ! -f $OUT ] + then + echo "pianobar does not seem to be outputting to $OUT, try killing it and starting $0 again" + exit 2 + fi -# Run running() in the background to detect when pianobar closes. -running & -RUNNINGPID=$! + tail -n$OUTPUT_LINES -f $OUT & + TAILPID=$! +} # Get input from user, character by character, and feed it to pianobar's ctl # fifo. Note that no newline character is given with `read`. Rather, one # simply gets an empty variable back. Detect this situation and pass a newline # along to pianobar. Otherwise, send the character read from input to -# pianobar. -IFS="" -while /bin/true -do - read -n1 -s INPUT - if [[ $? == "1" || "$INPUT" == $'\004' ]] +# pianobar. If ^D or EOF is given, quit +input(){ + IFS="" + while /bin/true + do + read -n1 -s INPUT + if [[ $? == "1" || "$INPUT" == $'\004' ]] + then + quit + elif [ "$INPUT" == "" ] + then + send_input "\n" + else + send_input "$INPUT" + fi + done +} + +# send the first argument to the control fifo +send_input(){ + echo -ne "$1" > $FIFO +} + +# Ensure the ctrl fifo exists. Arg1: create if it doesn't exist +ensure_fifo(){ + if [ ! -p $FIFO ] then - quit - elif [ "$INPUT" == "" ] - then - echo "" > $HOME/.config/pianobar/ctl - else - echo -n $INPUT > $HOME/.config/pianobar/ctl - fi -done + if [[ $1 ]] + then + echo "Pianobar ctl fifo not present at $FIFO, creating" + mkfifo $FIFO + if [ ! -p $FIFO ] + then + echo "Failed to create fifo, aborting" + exit 1 + fi + else + echo "Pianobar ctl fifo not present at $FIFO, aborting" + exit 1 + fi + fi +} + +# Ensure quit() is called to clean up when exiting +trap quit HUP INT TERM + +mkdir -p $XDG_CONFIG_HOME/pianobar + +# load the main pianobar config file +# Don't use $XDG_CONFIG_HOME or $HOME after this because it may have changed if set in the config file. +load_config + +# if no arguments, launch pianobar if not running, then connect to the pianobar ui +if [[ $# == 0 ]] +then + launch + + # Run running() in the background to detect when pianobar closes. + running & + RUNNINGPID=$! + + output + + input +else + if ! is_running + then +# if there are arguments, and pianobar is not running, start pianobar if it makes sense to + case $1 in + $ACT_SONGPLAY | $ACT_SONGPAUSETOGGLE | $ACT_SONGPAUSETOGGLE2) + launch + shift ;; + *) + echo "Pianobar not running, nothing executed" + exit 0 + ;; + esac + fi +# if there are arguments and pianobar is running, send arguments to pianobar, then exit + ensure_fifo + while [[ $# > 0 ]]; do + send_input "$1" + shift + done +fi |