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mplayerss.go
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mplayerss.go
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package main
/*
* Kill xscreensaver, cairo-compmgr and/or compton before running
* mplayer and reactivate them after mplayer exits
* @author Gianluca Fiore
* @copyright 2014-2020, Gianluca Fiore <forod.g@gmail.com>
*/
import (
"bytes"
"fmt"
"os"
"os/exec"
"strconv"
"syscall"
)
// Listing all possible app here as it's quicker to change them if using a
// different program to accomplish the same things (like MPlayer/SMPlayer)
const mplayerCmd string = "mpv"
const screensaverCmd string = "xscreensaver"
const cairoCmd string = "cairo-compmgr"
const comptonCmd string = "compton"
func getPidOf(command string) string {
pidBytes := exec.Command("ps", "-o", "pid=", "-C", command)
out, err := pidBytes.Output()
if err != nil {
if len(out) == 0 {
// if out is empty, the process isn't running. Return empty string
return ""
}
panic(err)
}
// Use a new []byte to contain the numerical only output of the ps command
var finalPid []byte
for _, x := range out {
// if it's between 48 and 57 in the ASCII table, it's a number. Ignore
// the rest (usually a space at the beginning and a trailing newline
// symbols)
if x > 47 && x < 58 {
finalPid = append(finalPid, x)
}
}
// convert []byte (pidBytes) to string
/* pid := string(out[1:len(out)-1]) */
pid := string(finalPid)
return pid
}
func deactivateScreensaver() {
screensaverPidStr := getPidOf(screensaverCmd)
// string -> int
if screensaverPidStr != "" {
screensaverPid, err := strconv.Atoi(screensaverPidStr)
if err != nil {
panic(err)
}
if err := syscall.Kill(screensaverPid, 0); err != nil {
// not running, just exit
fmt.Println("Xscreensaver is not running")
return
}
// Kill it then
fmt.Println("Xscreensaver is running")
cmd := exec.Command(screensaverCmd, "-deactivate", ">&-", "2>&- &")
startErr := cmd.Start()
if startErr != nil {
panic(startErr)
}
} else {
return
}
}
func dpmsControl(action bool) {
// true means enable, false disable
if action {
dpmsCmd1 := exec.Command("xset", "+dpms")
startErr := dpmsCmd1.Start()
if startErr != nil {
panic(startErr)
}
dpmsCmd2 := exec.Command("xset", "s", "on")
startErr = dpmsCmd2.Start()
if startErr != nil {
panic(startErr)
}
} else {
dpmsCmd1 := exec.Command("xset", "-dpms")
startErr := dpmsCmd1.Start()
if startErr != nil {
panic(startErr)
}
dpmsCmd2 := exec.Command("xset", "s", "off")
startErr = dpmsCmd2.Start()
if startErr != nil {
panic(startErr)
}
}
}
func compositingControl(action string, manager string) {
if action == "kill" {
managerPidStr := getPidOf(manager)
// string -> int
if managerPidStr != "" {
managerPid, err := strconv.Atoi(managerPidStr)
if err != nil {
panic(err)
}
killErr := syscall.Kill(managerPid, 9)
if killErr != nil {
panic(killErr)
}
} else {
// the composite manager might not be running after all
return
}
} else if action == "activate" {
var activateCmd *exec.Cmd
if manager == "cairo" {
activateCmd = exec.Command(cairoCmd)
} else if manager == "compton" {
// full path here
activateCmd = exec.Command(comptonCmd, "--config", "/home/gianluca/.config/compton.conf")
} else {
return
}
printCmdStderr(activateCmd)
}
}
func printCmdStderr(cmd *exec.Cmd) {
var out, stderr bytes.Buffer
cmd.Stdout = &out
cmd.Stderr = &stderr
startErr := cmd.Start()
if startErr != nil {
fmt.Println(fmt.Sprint(startErr) + ": " + stderr.String())
}
}
func main() {
// Disable the current composite manager
compositingControl("kill", "compton")
// Disable dpms and screensaver
dpmsControl(false)
//deactivateScreensaver()
// Launch MPlayer
cmd := exec.Command(mplayerCmd, os.Args[1])
startErr := cmd.Start()
if startErr != nil {
panic(startErr)
}
waitErr := cmd.Wait()
if waitErr != nil {
panic(waitErr)
}
// Re-enable the composite manager
compositingControl("activate", "compton")
// Re-enable dpms and screensaver
dpmsControl(true)
os.Exit(0)
}