commit - d55310b3dcbc2ceabf84d9e550d7122d7571e2cf
commit + 79ed446f0b3f923352c048ffc72a49cad53fadf2
blob - /dev/null
blob + 43cc5d546b93f3cb16190484b29a4db29f9672cc (mode 644)
--- /dev/null
+++ bin/amused-monitor.lp
+# amused-monitor
+
+This is a small interface for the amused music player
+
+=> https://projects.omarpolo.com/amused.html amused
+
+ #!/usr/bin/env rc
+
+It's written in rc because I found easier to manage subprocesses in it
+rather than in sh.
+
+There are two main processes involved: input and ui. The input
+process handles the keybindings and controls amused, the ui input
+waits for some events and redraws the interface.
+
+ fn input {
+ ifs=()
+
+$ifs needs to be set to the empty list (or empty string), otherwise
+we're not able to read spaces as keybindings.
+
+ run=1
+ while (~ $run 1) {
+
+rc lacks a break statement, so I'm using a flag variable to quit
+looping.
+
+ stty raw
+ t=`{dd bs=1 count=1 status=none}
+ stty cooked
+
+This is just a trick to read without echoing back the characters.
+
+ switch ($"t) {
+ case n
+ amused next
+ case p
+ amused prev
+ case ' '
+ amused toggle
+ case s
+ amused stop
+ case q
+ run=0
+ case *
+ echo unknown keybinding '>'$t'<'
+ }
+ }
+ }
+
+The ui functions render the interface. I'd like to keep a small xterm
+open, that's why I'm narrowing (with grep -A -B) only to the songs
+around the currently played one.
+
+ fn ui {
+ clear
+ amused show -p | grep -A3 -B3 '^>' | awk '{printf "%s\r\n", $0}'
+
+The awk trick deserves an explanation. Since the input function is
+very likely running, the terminal is in "raw" mode: we need \r to
+reposition the character at the start of the line.
+
+ }
+
+The uiloop function is the driver for the ui process: it listens to
+interesting events and redraws the ui when they happen
+
+ fn uiloop {
+ amused monitor | egrep --line-buffered 'next|prev|pause' | {
+ while (read) {
+ ui
+ }
+
+A small note of merit: unlike other shells read is not a built in in
+rc bur rather an external command (/usr/local/plan9/bin/read here.)
+
+ }
+ }
+
+And that's all. I only need to launch the functions in the correct
+order and do one render at the start and amused-monitor is done!
+
+ ui
+ uiloop &
+ uipid=$apid
+ input
+ kill -INT -$uipid
+
+
+
+
blob - 8b9897df2dd0100aea8ee8901b07a045bbe208f3
blob + df3e8e76b5eab8dbbd629db606de181060b0d444
--- gen
+++ gen
pair .cwmrc cwmrc.lp
pair bin/acmerc bin/acmerc.lp +x
+pair bin/amused-monitor bin/amused-monitor.lp +x
pair bin/browser bin/browser.lp +x
pair bin/sshot bin/sshot.lp +x
